JP6177574B2 - Opening device and refrigerator provided with the same - Google Patents

Description

  The present invention relates to a door opening device and a refrigerator including the door opening device.

In claim 1 of Patent Document 1,
“A transmission gear that can rotate in accordance with the driving force of the motor, and a first gear that can alternately advance in accordance with the direction of rotation of the transmission gear and can directly or indirectly contact the first and second opening / closing members. And a second projecting member, and advancing the first projecting member by rotating the transmission gear in a first direction to assist the operation of the first opening and closing member, and The transmission gear is rotated in a second direction opposite to the first direction to advance the second projecting member to assist the operation of the second opening / closing member. An “operation assisting device” is disclosed.

In claim 2 of Patent Document 2,
“A double door left and right doors that can be opened and closed at the front opening of the main body storage room, a left opening device that opens the left door when energized, and a right that opens the right door when energized A door opening device, a left door switch for energizing the left door device by a user operation, a right door switch for energizing the right door device by a user operation, and the left door or the right door A rotary partition plate that rotates according to the opening or closing operation of the left door or the right door and closes a gap with the door that faces when the door is closed, and the left door switch and the right door switch are substantially When operated at the same time, there is disclosed a "refrigerator" characterized in that the left door device or the right door device on the door side not provided with the rotating partition plate is energized.

Japanese Patent No. 3604947 Japanese Patent No. 4151966

  The configuration described in Patent Document 1 does not describe suitable acceleration characteristics, speed characteristics, or suitable operation time when projecting the protruding member. Since the protruding member is driven by a combination of so-called rack and pinions formed between the transmission gear and the protruding member, the protruding member is protruded at a constant speed when the motor is rotated at a constant speed of, for example, the rated rotational speed. The

  In such a configuration, if the transmission gear reduction ratio is sufficiently increased to obtain a force greater than that required for packing peeling, the speed of the protruding member remains low during the opening operation, and the door is sufficiently inertial. The speed until opening is not obtained.

  On the other hand, if the reduction gear ratio is reduced so that the speed can be sufficiently obtained, the force required for peeling the packing cannot be obtained.

  That is, in order to perform the door opening operation at a high speed enough to open the door sufficiently with inertia, and to obtain the necessary force when peeling the packing, increase the motor output and reduce the transmission gear reduction ratio. Is required, and the speed at the start of the operation of the protruding member increases, resulting in a sudden opening operation.

  Furthermore, since one of the protruding members moves forward when the other protrudes, there is a problem that a space is required for the protruding member to move backward, and the operation assisting device is increased in size.

  Next, in the configuration described in Patent Document 2, in order to open the double door left door and the right door, a left door device that opens the left door and a right door device that opens the right door There is a problem that a two-type door opening device is required and the device becomes complicated.

  In addition, the plunger is sucked by energizing the solenoid coil, which is an electromagnetic actuator, and a pressing member (protruding member) fixed coaxially with the plunger is moved in the door direction to push the door open. . Since the solenoid cannot be provided with a speed reduction mechanism and the suction operation by magnetic force cannot be slowed down, the door is pushed open at a speed equivalent to the movement of the plunger, for example, in a short time of about 0.2 seconds.

  When food is not stored in the door pocket and the door is light, since the inertia of the door is small, the door accelerates in a short time and the maximum speed of the door increases. On the other hand, when a large amount of food is stored in the door pocket and the door is heavy, the inertia of the door is large, so the time required for acceleration increases, the maximum speed of the door decreases, and the opening operation is slow. Become. Therefore, the acceleration varies depending on the amount of food stored in the door pocket, especially when the storage amount is small, the door opening operation is abrupt, and the impact force is applied to the food due to the short-time acceleration during the door opening operation. There is a problem of joining.

  In view of the above problems, the present invention can smoothly perform the opening operation of the door without giving an impression of sudden opening when the rotary door is electrically opened. In addition, there is little difference in opening time due to the amount of stored items stored in the storage portion of the door, and the door opening operation can be performed stably.

In order to achieve the above object, for example, the configuration described in the claims is adopted. As an example, the first door and the second door supported around the rotation fulcrum, and the opening device for opening the first door and the second door, the opening device Is a motor capable of normal rotation and reverse rotation, a reduction gear train for transmitting the rotation of the motor, and a switching means for performing a switching operation for switching the transmission destination of the reduction gear train in accordance with the normal rotation and reverse rotation of the motor. Driving force is transmitted when the switching means is switched to one, and driving force is transmitted when the first door opening means opens the first door and the switching means is switched to the other. And a second door opening means for opening the second door.

  According to the present invention, when the revolving door is electrically opened, the opening operation of the door can be smoothly performed without giving an impression of suddenly opening. In addition, there is little difference in opening time due to the amount of stored items stored in the storage portion of the door, and the door opening operation can be performed stably.

It is the figure which looked at the refrigerator main body in embodiment of this invention from the front. It is the EE sectional view conceptual diagram of FIG. It is a front view showing the structure in the store | warehouse | chamber of a refrigerator. FIG. 3 is an enlarged explanatory view of a main part of FIG. 2. It is the top view which looked at the refrigerator main body in embodiment of this invention from the A direction of FIG. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention. It is BB sectional drawing in FIG. 6 of the door opening apparatus in embodiment of this invention. It is a perspective view which shows the structure of the switching means of the door opening apparatus in embodiment of this invention. It is a top view which shows the structure of the switching means of the door opening apparatus in embodiment of this invention. It is a top view which shows the other structure of the switching means of the door opening apparatus in embodiment of this invention. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention, and shows the state of an origin position. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention, and shows the state which the 1st door opening means of the left side protruded to the maximum. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention. It is a top view which shows the structure of the door opening apparatus in embodiment of this invention, and shows the state which the 2nd door opening means of the right side protruded to the maximum. It is a top view which shows the door opening operation | movement of the 1st door and the 2nd door by the door opening apparatus in embodiment of this invention. It is a graph which shows the relationship between an opening angle and the door opening force at the time of opening the rotation door in embodiment of this invention from the time of closing. It is a graph which shows the preferable angular velocity characteristic and angle displacement characteristic at the time of opening the rotary door in embodiment of this invention. It is explanatory drawing which shows the relationship between the rotating plate and connection plate in embodiment of this invention. It is explanatory drawing which shows the relationship between the rotating plate and connection plate in embodiment of this invention, and is a figure which shows the displacement of a connection plate when a rotation plate rotates. It is a graph explaining the operating speed characteristic of the door opening member of the door opening apparatus in embodiment of this invention. It is explanatory drawing which shows the relationship between the speed of the door opening member by the door opening apparatus in embodiment of this invention, and the speed of a rotation door edge part. It is a block diagram which shows the structure of the control system of the door opening apparatus in embodiment of this invention. It is a flowchart which shows the control procedure in the case of the initialization operation | movement of the door opening apparatus in embodiment of this invention. It is a flowchart which shows the control procedure in the case of the door opening operation | movement of the 1st door of the door opening apparatus in embodiment of this invention. It is a flowchart which shows the control procedure in the case of the door opening operation | movement of the 2nd door of the door opening apparatus in embodiment of this invention. In the door opening apparatus in embodiment of this invention, it is a timing chart which shows the operation | movement of a door opening switch, detections, and a motor at the time of door opening operation | movement of a 1st door. In the door opening apparatus in embodiment of this invention, it is a timing chart which shows the operation | movement of a door opening switch, detections, and a motor at the time of door opening operation | movement of a 2nd door. It is a top view which shows the structure and operation | movement of a closer in embodiment of this invention.

  Hereinafter, an example for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

≪Configuration of equipment (refrigerator) equipped with door opening device≫
First, before explaining the door opening device 60 (see FIG. 6 and the like) according to the first embodiment, as an apparatus including the door opening device 60 (see FIG. 6 and the like) according to the first embodiment, a refrigerator is taken as an example. This will be described with reference to FIGS.

<Overall configuration of refrigerator body 1>
FIG. 1 is a front external view of the refrigerator according to the present embodiment as viewed from the front. FIG. 2 is a cross-sectional view taken along line EE in FIG. FIG. 3 is a front view illustrating the configuration inside the refrigerator. FIG. 4 is an enlarged explanatory view of the main part of FIG. FIG. 5 is a plan view showing the upper surface of the refrigerator.

As shown in FIG. 3, the refrigerator main body 1 of the present embodiment includes, from above, a refrigerator compartment 2, an ice making room 3 and an upper freezer compartment 4 arranged side by side, a lower freezer compartment 5, and a vegetable compartment 6. Have. As an example, the refrigerator compartment 2 and the vegetable compartment 6 are storage rooms in a refrigerator temperature zone of approximately 3 to 5 ° C.
Further, the ice making room 3, the upper freezer room 4, and the lower freezer room 5 are storage rooms in a freezing temperature zone of approximately −18 ° C.

  As shown in FIG. 1, the refrigerating room 2 includes, on the front side, refrigerating room doors 2a and 2b having a double door (so-called French type) divided into left and right sides. Hereinafter, the refrigerator compartment doors 2a and 2b may be referred to as a first door 2a and a second door 2b. The refrigerator compartment doors 2a and 2b rotate around the door hinges 17a and 17b. In order to close the gap between the left and right refrigeration room doors 2a and 2b, in this embodiment, a swinging squeezable 18 is provided along the side of the left refrigeration room door 2a close to the right refrigeration room door 2b. ing. Its configuration will be described later.

  In addition, the ice making chamber 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are each provided with a drawer type ice making door 3a, an upper freezer compartment door 4a, a lower freezer compartment door 5a, and a vegetable compartment door 6a. . In the following description, the left and right refrigerator compartment doors 2a, 2b, ice making compartment door 3a, upper freezer compartment door 4a, lower freezer compartment door 5a, and vegetable compartment door 6a are simply referred to as doors 2a, 2b, 3a, 4a, 5a. , 6a.

  The refrigerator body 1 has door sensors (not shown) that detect the open / closed states of the doors 2a, 2b, 3a, 4a, 5a, and 6a, and the doors 2a, 2b, 3a, 4a, 5a, and 6a are open. An alarm (not shown) that informs the user when the state determined to have been continued for a predetermined time (for example, 1 minute or longer), the temperature setting of the refrigerator compartment 2, the upper freezer compartment 4 and the lower compartment A temperature setting device (control panel 40 including an operation unit and a display unit in FIG. 1) for setting the temperature of the freezer compartment 5 is provided.

  The refrigerator doors 2a and 2b are respectively provided with a left opening switch 48a and a right opening switch 48b.

  As shown in FIG. 2, the outside of the refrigerator body 1 and the inside of the refrigerator are separated by a heat insulating box 10 formed by filling a foam heat insulating material (foamed polyurethane) between the inner box 10a and the outer box 10b. It has been. Moreover, the heat insulation box 10 of the refrigerator body 1 has a plurality of vacuum heat insulating materials 14 mounted thereon.

  In the warehouse, a plurality of storage chambers arranged in different vertical directions in different temperature zones are adiabatically partitioned by heat insulating partition walls 11a and 11b. That is, by the upper heat insulating partition wall 11a, the refrigerating room 2 which is a refrigerating temperature zone storage room, the upper freezing room 4 and the ice making room 3 which are refrigerating temperature zone storage rooms (see FIG. 1, ice making room 3 in FIG. 2). Is not shown). In addition, the lower heat insulating partition wall 11b separates the lower freezing room 5 which is a storage room in a freezing temperature zone and the vegetable room 6 which is a storage room in a refrigeration temperature zone.

  As shown in FIG. 2, a plurality of door pockets 13 are provided inside the refrigerator compartment doors 2a and 2b. The refrigerator compartment 2 is partitioned into a plurality of storage spaces in the vertical direction by a plurality of shelves 12.

  Moreover, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are each provided with storage containers 4b, 5b, 6b behind doors 4a, 5a, 6a provided in front of the respective storage compartments. . The storage containers 4b, 5b, and 6b can be pulled out by placing a hand on a handle portion (not shown) of the doors 4a, 5a, and 6a and pulling it out to the front side. Similarly, in the ice making chamber 3 shown in FIG. 1, a storage container (indicated by (3b) in FIG. 2) is provided behind the door 3a, and the handle 3 (not shown) of the door 3a is put on the hand and pulled out to the front side. Thus, the storage container 3b can be pulled out.

  As shown in FIG. 2, doors 2 a, 2 b, 3 a, 4 a, 5 a, and 6 a are provided with door packings 15 around them, and are in close contact with the opening peripheral edge of the refrigerator main body front surface 16 when each door is closed. Thus, the inside of the storage space (the refrigerator compartment 2, the ice making chamber 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6) is closed and sealed to prevent leakage of cold air from the storage space to the outside.

<Cooling air circulation>
As shown in FIG. 2 (refer to FIG. 3 as appropriate), the cooler 7 is provided in a cooler storage chamber 8 provided substantially at the back of the lower freezing chamber 5. The cooler 7 is configured by attaching a large number of fins to the cooler pipe 7d so that heat can be exchanged between the refrigerant and the air in the cooler pipe 7d.

  Further, an internal fan 9 (for example, a fan driven by a motor) is provided above the cooler 7. The air cooled by the heat exchange by the cooler 7 (hereinafter, the low-temperature air heat-exchanged by the cooler 7 is referred to as “cold air”) is sent to the refrigerator air blow duct 22 and the vegetable room air blow duct 25 by the internal fan 9. To the storage rooms of the refrigerator compartment 2, the vegetable compartment 6, the ice making compartment 3, the upper freezer compartment 4 and the lower freezer compartment 5 through the ice making compartment air duct 26a, the upper freezer compartment air duct 26b and the lower freezer compartment air duct 27. It is supposed to be sent. Incidentally, each air duct to the refrigerator compartment 2, the ice making room 3, the upper freezer room 4, the lower freezer room 5, and the vegetable room 6 is provided on the back side of each storage room of the refrigerator main body 1 as shown by a broken line in FIG. It has been.

  The storage room to which the cool air from the cooler 7 is sent is controlled by the refrigerating temperature zone cool air control means 20 and the freezing temperature zone room cool air control means 21.

  Here, the refrigeration temperature zone cold air control means 20 is a so-called twin damper having two independent openings, and the first opening 20a controls the air flow to the cold room air duct 22, and the second opening 20b. Controls the air flow to the vegetable room air duct 25. The freezing temperature zone cold air control means 21 is a single damper having a single opening, and controls the air blowing to the ice making room air duct 26a, the upper freezer room air duct 26b, and the lower freezer room air duct 27. It has become.

  Specifically, when the first opening 20a of the refrigeration temperature zone cold air control means 20 is in an open state, the cold air is provided in multiple stages via the cold room upstream duct 23 (described later) and the cold room air duct 22. It is sent to the refrigerator compartment 2 from the blower outlet 2c. The cold air that has cooled the refrigerator compartment 2 flows from the return port 2d provided in the lower portion of the refrigerator compartment 2 through the refrigerator compartment return duct 24 into the cooler compartment 8 from the lower side portion of the cooler compartment 8. The heat exchange with the cooler 7 is performed.

  In addition, when the second opening 20b of the refrigeration temperature zone cold air control means 20 is in the open state, the cold air passes from the outlet 6c to the vegetable compartment 6 via the cold compartment upstream duct 23 (described later) and the vegetable compartment air duct 25. Sent. The cold air that has cooled the vegetable compartment 6 flows into the cooler housing chamber 8 from the lower part of the cooler housing chamber 8 via the return port 6 d and exchanges heat with the cooler 7. Incidentally, the amount of air circulating through the vegetable compartment 6 is smaller than the amount of air circulating through the refrigerator compartment 2 and the amount of air circulating through the freezing temperature zone chamber described later.

  When the freezing temperature zone cold air control means 21 is in the open state, the cold air is sent to the ice making chamber 3 and the upper freezer compartment 4 from the outlets 3c and 4c through the ice making chamber air duct 26a and the upper freezer compartment air duct 26b, respectively. . Further, it passes through the lower freezer compartment air duct 27 and is sent from the outlet 5 c to the lower freezer compartment 5. As described above, the refrigeration temperature chamber cold air control means 21 is attached above the blower cover 31 to be described later and facilitates air blowing to the ice making chamber 3.

  The cold air blown into the ice making chamber 3 through the ice making chamber blow duct 26 a and the cold air blown into the upper freezer compartment 4 through the upper freezer compartment blow duct 26 b descend to the lower freezer compartment 5. Then, the cool air blown into the lower freezer compartment 5 through the lower freezer compartment air duct 27 flows into the cooler storage compartment 8 through the freezer return port 28 provided in the lower part of the lower freezer compartment 5. The heat exchange with the cooler 7 is performed.

  The cold air that has cooled the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 returns to the cooler storage chamber 8 through the freezing chamber return port 28 provided in the lower part of the lower freezing chamber 5. Incidentally, the width dimension of the freezer compartment return port 28 is substantially equal to the width dimension of the cooler 7.

  As shown in FIG. 4, the freezing temperature zone back partition 29 in which the outlets 3 c, 4 c, and 5 c are formed includes an upper freezing chamber 4, an ice making chamber 3, a lower freezing chamber 5, and a cooler storage chamber 8. Divide the space.

  The blower support part 30 to which the internal blower 9 is attached partitions the cooler storage chamber 8 and the freezing temperature zone back partition 29.

  The blower cover 31 is disposed so as to cover the front surface of the internal fan 9. Between the blower cover 31 and the freezing temperature zone back partition 29, an ice making chamber blow duct 26a and an upper freezer compartment blow duct for guiding the cool air blown by the internal blower 9 to the outlets 3c, 4c, 5c. 26b and a lower stage freezer compartment air duct 27 are formed. Further, an air outlet 31a is formed in the upper part of the blower cover 31, and a refrigerating temperature zone cold air control means 21 is provided at the air outlet 31a.

  Further, the blower cover 31 also plays a role of blowing cold air blown by the internal fan 9 toward the refrigeration temperature zone cold air control means 20 side. That is, the cold air that does not flow to the refrigeration temperature zone cold air control means 21 side provided in the blower cover 31 passes to the refrigeration temperature zone room cold air control means 20 side via the cold room upstream duct 23 as shown in FIG. Led.

  The blower cover 31 includes a rectifying unit 31 b on the front surface of the internal fan 9. The rectifying unit 31b rectifies the turbulent flow caused by the cold air blown out to prevent noise generation.

  When the refrigeration temperature zone cool air control means 20 and the freezing temperature zone cool air control means 21 are in the open state, most of the cool air is sent to the freezing temperature zone cool air control means 21 side, and the remaining other cool air is Each air duct and the like are configured to be led to the refrigeration temperature zone cold air control means 20 side. Accordingly, one cooler is provided for the freezing temperature zone (ice making chamber 3, upper freezing chamber 4 and lower freezing chamber 5) and the refrigerating temperature zone (refrigeration room 2 and vegetable room 6) which are storage rooms having different temperature zones. 7 can supply cold air.

  As described above, switching of the cool air to be blown to each storage chamber of the refrigerator main body 1 can be performed by appropriately opening and closing the refrigeration temperature zone cool air control means 20 and the freezing temperature zone room cool air control means 21. It can be done.

  Further, as shown in FIG. 4, a defrost heater 35 as defrosting means is installed below the cooler 7, and defrost water is placed on the defrost heater 35 above the defrost heater 35. In order to prevent dripping, an upper cover 36 is provided.

  The defrost water generated by the defrosting (melting) of the frost attached to the walls of the cooler 7 and the surrounding cooler storage chamber 8 flows into the trough 32 provided at the lower part of the cooler storage chamber 8. It reaches the evaporating dish 34 disposed in the machine room 50 through the drain pipe 33, is evaporated by the heat of the compressor 51 and the condenser 52, which will be described later, and is discharged outside the refrigerator.

<Machine room>
As shown in FIG. 3, a machine room 50 is provided on the lower back side of the heat insulating box 10. In the machine room 50, a compressor 51 that compresses and discharges the refrigerant, a condenser 52 that exchanges heat between the refrigerant and air, an external fan 53 that promotes heat exchange between the refrigerant and air in the condenser 52, A decompression means 54, which is a thin tube, is arranged.

  The compressor 51, the condenser 52, and the decompression means 54 are connected to the cooler 7 through a pipe so that a refrigerant path (refrigerant circuit) through which the refrigerant flows is formed.

<Sensor and control system>
As shown in FIG. 2, a control board 41, which is a control means on which a CPU, a memory such as a ROM or a RAM, an interface circuit, and the like are mounted as a control means, is disposed on the top surface of the refrigerator body 1. The refrigerator includes a refrigerator temperature sensor 44 that detects the temperature of the refrigerator compartment 2, a vegetable compartment temperature sensor 45 that detects the temperature of the vegetable compartment 6, a freezing temperature zone (the ice making chamber 3, the upper freezer compartment 4, and the lower freezer compartment 5. ), And a temperature sensor such as a cooler temperature sensor 47 for detecting the temperature of the cooler 7 is provided, and the detected temperature is input to the control board 41. The control board 41 includes door sensors (not shown) that detect the open / closed state of the doors 2a, 2b, 3a, 4a, 5a, and 6a, a control panel 40 (see FIG. 1) provided on the refrigerator compartment door 2a, The left door switch 48a and the right door switch 48b provided in the refrigerator compartment doors 2a and 2b are connected.

  Then, the control board 41 individually controls the ON / OFF of the compressor 51 and the control of the rotational speed, the refrigeration temperature zone cool air control means 20 and the freezing temperature zone cool air control means 21 according to the program previously installed in the ROM. The control of each drive motor (not shown) that drives the fan, the ON / OFF of the internal fan 9 and the rotational speed, the ON / OFF of the external fan 53, the rotational speed, etc., and the door open state are notified. By controlling ON / OFF of an alarm (not shown), operation of the door opening device 60, and the like, the operation of the entire refrigerator can be controlled.

<Implementation of door opening device>
An opening device 60 is provided adjacent to the front surface of the top surface of the ceiling wall of the refrigerator body 1, that is, the refrigerator compartment doors 2a and 2b. The door opening device 60 includes first door opening means 61a (left protruding member) and second door opening means 61b (right protruding member) respectively corresponding to the first door 2a and the second door 2b. The first door opening means 61a and the second door opening means 61b are changed from the state accommodated in the door opening device 60 to the first door 2a (left refrigerator compartment door) and the second door 2b (right refrigerator compartment door). The first door 2a and the second door 2b are pushed and opened by pushing the vicinity of the upper ends of the first door 2a and the second door 2b.

  In the present embodiment, the first door 2a is provided with a rotating partition 18, and the rotating partition 18 is pivotably pivoted around a rotating squeeze fulcrum 19 provided on the left refrigerator door 2a. When the left refrigerator compartment door 2a is closed, the rotating partition 18 is positioned in parallel with the left refrigerator compartment door 2a and closes the gap between the left refrigerator compartment door 2a and the right refrigerator compartment door 2b. It is a configuration.

  When the left refrigerator compartment door 2a is opened, the rotating partition 18 swings around the rotating partition fulcrum 19 by the action of a cam (not shown) and rotates to a position substantially orthogonal to the left refrigerator compartment door 2a. It is the structure opened without interfering with the right refrigerator compartment door 2b.

<Open angle>
Here, a preferred angle when the door is opened by the door opening device 60 will be described with reference to the left refrigerator compartment door 2a as an example with reference to FIG.

  In FIG. 5, the maximum opening angle θdmax when the first door opening means 61a of the opening device 60 acts on the left refrigerator door 2a shown in FIG. 5 by the maximum protruding amount H2 is shown by a broken line.

  If the distance from the hinge 17a of the first door opening means 61a is Rda and the maximum protruding amount of the protruding member 61a is H2, the opening angle θdmax of the refrigerator compartment door 2a when the first door opening means 61a protrudes the most Is θdmax = ATAN (maximum protruding amount H2 / distance Rda), and is determined by the protruding amount of the first door opening means 61a of the door opening device 60 and the distance from the hinge 17a.

  Next, a preferable angle of the operation opening angle θdmax will be described.

  First, the closer mechanism 37 which is a closing means provided in the refrigerator compartment doors 2a and 2b will be described with reference to FIG. Corresponding to the left refrigerator compartment door 2a and the right refrigerator compartment door 2b, since the symmetrical closer mechanism 37 is provided in each refrigerator compartment door, only the left refrigerator compartment door 2a is demonstrated in detail here.

  In the refrigerator compartment doors 2a and 2b of the refrigerator, a structure is used in which a so-called half-open state is prevented by urging the door in the direction in which the door is closed when the door is completely closed. This mechanism is called a closer, and when the door closes, the resin leaf spring member is temporarily deformed to store energy, and when the door closes, the bias is applied in the direction of closing the door. Is.

  First, the configuration, operation, and problem of the closer mechanism 37a will be described with reference to FIG. FIG. 30A to FIG. 30C show the movement of the closer mechanism 37 and the force generated by the closer mechanism 37 when performing the operation of gradually closing the refrigerator compartment door 2a. Since this closer is generally provided at the lower end of the door hinge 17 of the refrigerator compartment door 2a, FIGS. 30 (a) to 30 (c) are views of the refrigerator compartment door 2a virtually viewed from the lower surface. is there.

A fixed closer bracket 38a is attached to the refrigerator main body 1, and a cam portion 38b formed in a smooth curved surface is provided in a part thereof. The refrigerator compartment door 2a is provided with a closer elastic body 39a having a deformed portion 39b formed of a material having elasticity such as resin,
As shown in FIG. 30 (a), when the refrigerator compartment door 2a rotates counterclockwise CCW and closes to an angle φ1, the deformed portion 39b of the closer elastic body 39a contacts the cam portion 38b of the closer bracket 38a. However, the deformed portion 39b of the closer elastic body 39a bends due to the reaction force in the direction of the arrow Fa. This force acts in the clockwise CW direction with respect to the door hinge 17 of the door, that is, the direction in which the refrigerator compartment door 2a is opened. Therefore, when viewed from the user, the refrigerator compartment door 2a being closed becomes heavy from the middle. When the refrigerator door 2a is further closed and the opening angle becomes φ2 as shown in FIG. 30 (b), the contact between the closer elastic body 39a and the closer bracket 38a is on the same line as the door hinge 17 of the refrigerator door 2a. Therefore, the force Fb between the closer elastic body 39a and the closer bracket 38a is directed toward the rotation fulcrum, so that the moment is zero, and the refrigerator compartment door 2a is balanced and cannot receive any force for opening and closing. . Since the closer elastic body 39a bends and accumulates elastic energy up to the neutral point, when the refrigerator compartment door 2a is further closed past the neutral point, the closer elastic body from the cam portion 38b of the closer bracket 38a. The force in the direction of arrow Fc is applied to 39a, and this force becomes a moment in the direction of closing the door (counterclockwise CCW in this figure) with respect to the rotation fulcrum 3 of the door, and this force closes the refrigerator compartment door 2a. It is done.

  That is, when the open angle, which is a neutral point, is equal to or less than φ2, the refrigerator door 2a is closed by the action of the closer, so the angle θd that opens the refrigerator door 2a by the opening device 60 is larger than φ2, that is, θd. > Φ2 is desirable, and if the relationship θd> φ2, the refrigerator compartment door 2a opened by the opening device 60 is not closed by the action of the closer.

  For example, if φ2 = 10 °, it is desirable that θd = 15 ° to 20 °.

  More desirably, if the opening angle θd is larger than φ1 so that the cam portion 38b and the deforming portion 39ba do not act, that is, θd> φ1, the door opening operation by the door opening device 60 is further reliably performed. It is.

  In the above description, the left refrigeration room door 2a has been described. Similarly, the right refrigeration room door 2b is preferably configured such that the opening angle θd by the opening device 60 is larger than the angle at which the closer acts. is there.

<Configuration of door opening device>
Next, the structure of the door opening device 60 in this embodiment is demonstrated using FIGS. 6-16. FIG. 6 is a plan view showing the configuration of the door opening device 60, and the lower side in the lower side of the drawing faces the refrigerator compartment doors 2 a and 2 b on the front surface of the refrigerator body 1. 7 is a cross-sectional view taken along line BB in FIG.

  In the description of FIGS. 6 to 16, in accordance with the front, rear, left and right of the refrigerator body 1, in FIG. 6, the lower side in the drawing is referred to as the front surface, the left and right sides in the drawing are referred to as the left side surface and the right side surface. In FIG. 7, the left side in the figure is the lower surface of the door opening device 60 and the side close to the upper surface of the refrigerator body 1, and the right side in the figure is the upper surface.

  Moreover, the structure which opens the left refrigerator compartment door 2a is demonstrated in detail.

  In FIG. 6, the structure which opens the left refrigerator compartment door 2a is demonstrated by attaching | subjecting the code | symbol a to each member.

  The first door opening means 61a is, for example, an elongated rod having a quadrangular cross section, and is supported so as to be movable along the inside of the left side surface of the case 62. From the opening 63a provided on the front surface of the case 62, It protrudes toward the refrigerator compartment door 2a and is configured to be movable so as to return to the original position. The front door opening means tip 64a on the front side of the first door opening means 61a has a flange shape that is slightly enlarged from the cross section of the first door opening means 61a.

  The door opening means distal end portion 64a may be made of a flexible material such as rubber, for example, and closes the opening 63a when the first door opening means 61a is retracted to prevent intrusion of water or dust from the outside. Therefore, it is preferable. Still further, it is preferable because the first door opening means 61a operates to reduce an impact when it comes into contact with the refrigerator compartment door 2a.

  On the back side of the first door opening means 61a, a connecting plate 65a is provided integrally with the first door opening means 61a, and the connecting plate 65a is provided inside the case 62 along the left side surface and the right side surface. The guide rail 66a is supported so as to be movable in the front-rear direction.

  That is, the connecting plate 65a and the first door opening means 61a are configured to be movable in the front-rear direction of the case 62 along the left side surface and the right side surface of the case 62, respectively.

  Each of the connecting plates 65a has a substantially triangular shape, and one side of the left side surface is parallel to the guide rail 66a. For example, the connecting plate 65a is a concave or convex portion that slidably engages with the guide rail 66a. One side is joined to the rearmost end of the first door opening means 61a and arranged parallel to the front surface of the case 62. The other side on the opposite side of the guide rail 66a, that is, the side facing the left-right center of the case 62 is a stepped portion 67a having a plurality of steps in a stepped shape.

  The connection plate 65a is provided with a spring receiver 68a, the case 62 is provided with a spring receiver 69a, a spring 70a is stretched between the spring receiver 68a and the spring receiver 69a, and the connection plate 65a and the first door are provided. The opening means 61 a is urged toward the back side of the case 62.

  Since it comprised in this way, the connection board 65a and the 1st door opening means 61a will be in the position most pulled in in the case 62 by the tension | tensile_strength of the spring 70a, and the 1st door opening means of the door opening means front-end | tip part 64a The surface on the 61a side comes into contact with the front surface of the case 62.

  Of the connecting plate 65a, a magnet 71a is provided in the vicinity of the first door opening means 61a and in the vicinity of the apex opposite to the guide rail 66a, and the door opening means position detection 72a is provided in the vicinity of the opening 63a of the case 62. For example, a Hall IC for detecting magnetism is provided, and the position of the connecting plate 65a and the first door opening means 61a is detected as will be described in detail later.

The rotary plate 73a is pivotally supported around the rotary plate center 74a, and a plurality of steps are provided around the rotary plate 73a. Although details will be described later, a step around the rotating plate 73a acts on the stepped portion 67a of the connecting plate 65a to convert the rotating operation of the rotating plate 73a into a linear operation of the connecting plate 65a.
A rotating plate gear 75a is provided integrally with the rotating plate 73a.

  The sorting gear 76a is rotatably supported around the sorting gear center 77a, and the meshing of the gear with the swinging gear 81 provided in the switching unit 80 is intermittently described in detail later. The sorting gear 76a and the rotating plate gear 75a mesh with each other. That is, when the sorting gear 76a rotates in the clockwise direction in the drawing, the rotating plate 73a rotates in the counterclockwise direction in the drawing, the connecting plate 65a and the protruding member 61a protrude from the opening 63a on the front surface of the case 62, and the refrigerator compartment door 2a is moved. It is the structure to open.

  Thereafter, if the sorting gear 76a is reversed and rotates counterclockwise in the drawing, or if the swinging gear 81 swings and disengages from the sorting gear 76a, the connecting plate 65a and the protruding member 61a are projected as described above. Is pulled into the case 62 by the tension of the spring 70a. Details of the configuration will be described later.

  Up to this point, only the configuration relating to the portion corresponding to the left refrigerator compartment door 2a has been described, but the above configuration is configured symmetrically corresponding to the right refrigerator compartment door 2b, and in FIGS. It is shown with b.

  That is, if the sorting gear 76b rotates counterclockwise in the figure corresponding to the right refrigerator compartment door 2b, the rotating plate 73b rotates in the clockwise direction in the figure, and the connecting plate 65b and the second door opening means 61b are in the case. 62 is configured to protrude from the opening 63b on the front surface and open the refrigerator compartment door 2b.

  After that, if the sorting gear 76b is reversed and rotates clockwise in the figure, or if a later-described swinging gear 81 swings to disengage from the sorting gear 76b, the connecting plate 65b and the second plate 65b as described above. The door opening means 61b is pulled into the case 62 by the tension of the spring 70b.

  Next, it is provided in the gap between the left and right sorting gears 76a and 76b and the left and right rotating plates 73a and 73b, as shown by the cross section BB in FIG. The configuration of the reduction gear train 83 and the switching means 80 for transmitting the driving force from the motor 82 to the sorting gears 76a and 76b will be described.

  An example of the motor 82 is a brush type DC motor, which can rotate in both the forward and reverse directions by reversing the polarity of the voltage applied to the terminal.

  A worm gear 84 is provided on the rotating shaft of the motor 82, and the worm gear 84 meshes with a worm wheel 85 that is a first gear. A second gear 87 that is a spur gear is provided integrally with the worm wheel 85, and both the worm wheel 85 and the second gear 87 are rotatably supported around a worm wheel shaft 86.

  The third gear 88 is rotatably supported around the third support shaft 89, and the fourth gear 90 is rotatably supported around the fourth support shaft 91. The third gear 88 meshes with the second gear 87, the fourth gear 90 meshes with the third gear 88, and the fifth gear 92. The gear 92 meshes with the fourth gear 90 and rotates to transmit the driving force of the motor 82 while decelerating.

  An example of the rotation direction of each gear when the motor 82 is rotated is indicated by an arrow in FIG. Here, the rotation direction of the worm gear 84 is, for example, a state in which the spiral teeth provided on the worm gear 84 are rotated in a direction moving from the side close to the motor 82 toward the front end side of the worm gear 84 along with the rotation. This is shown in the figure. For example, when the teeth of the worm gear 84 are spirals of a left screw opposite to a right screw that is a general screw, the motor 82 may be rotated clockwise, that is, in the direction of loosening the screw. Such a rotation direction is referred to as a “forward rotation direction”.

  A case where the worm gear 84 is rotated in the reverse direction by reversing the polarity of the voltage applied to the motor 82 is indicated by a broken-line arrow. In this embodiment, such a rotation direction is referred to as a “reverse direction”. Shall. Needless to say, “forward rotation” and “reverse rotation” means that the rotation direction is reverse rotation for the convenience of the description of the present embodiment, and is not limited to such expressions.

  In the present embodiment, since the motor 82 is disposed in the vicinity of the back surface of the case 62, the drive noise and vibration of the motor 82 are not easily transmitted to the front surface side. Therefore, noise can be reduced for an operator who operates the left door switch 48a or the right door switch 48b on the front surface of the refrigerator 1 to open the refrigerator compartment doors 2a and 2b.

  The driving force from the motor 82 transmitted to the fifth gear 92 swings around the swing center 93 depending on whether the rotation direction of the fifth gear 92 is clockwise or counterclockwise. Thus, switching means 80 for selecting and switching one of the sorting gears 76a and 76b as a transmission destination of the driving force is provided. Details thereof will be described later.

  A magnet 94 is provided on the front side of the case 62 farthest from the swing center 93 of the switching means 80 and swings integrally with the switching means 80. The switch detections 95a and 95b are, for example, Hall ICs that detect magnetism, and detect that the switch 94 swings and the magnet 94 moves. In the state shown in FIG. 6, since the magnet 94 is in an intermediate position away from both of the switching detections 95a and 95b, the switching detections 95a and 95b do not detect the magnetism of the magnet 94, and the switching detection 95a, Both outputs of 95b are OFF. Details thereof will be described later.

<Configuration of switching means>
The detailed configuration and operation of the switching unit 80 will be described with reference to FIG.

  FIG. 8A is a CC partial cross-sectional perspective view showing the configuration of the switching means 80, FIG. 8B is a perspective view, and as shown in FIG. , 76b and the magnet 94 is in an intermediate position away from both of the switching detections 95a and 95b. Therefore, the switching detections 95a and 95b do not detect the magnetism of the magnet 94, and the switching detection. The outputs of 95a and 95b are both OFF. Such a position, that is, the swinging gear 81 provided in the switching means 80 is not meshed with any of the sorting gears 76a and 76b, and the output of the switching detections 95a and 95b is both OFF. It is assumed that the door opening device 60 in the present embodiment is in the reference state.

  FIG. 8C is a perspective view showing a state in which the motor 82 rotates and the switching means 80 acts. The switching means 80 rotates around the swing center 93 in the illustrated CW (clockwise) direction and swings. A state is shown in which the driving gear 81 and the sorting gear 76 a are engaged with each other, and the driving force from the fourth gear 90 is transmitted to the sorting gear 76 a via the swinging gear 81.

  In the switching means 80, the rocking members 96a and 96b are rotatably supported around the rocking center 93, and rotate around the rocking center 93 together with the fifth gear 92 and the sixth gear 97. The fifth gear 92 meshes with the fourth gear 90 that rotates about the third support shaft 89.

  The oscillating gear 81 is rotatably supported around an oscillating gear center 98 provided on the oscillating members 96a and 96b, and oscillates around the oscillating center 93 together with the oscillating members 96a and 96b. The oscillating gear 81 meshes with the sixth gear 97. The driving force transmitted from the motor 82 to the fourth gear 90 via the reduction gear train 83 is transmitted to the swing gear 81 via the fifth gear 92 and the sixth gear 97.

  A friction applying member 99, which is a rubber ring, for example, is press-fitted between the swinging gear 81 and the swinging member 96b so that a friction torque is generated between them.

  The effect | action of the switching means 80 is demonstrated using FIG.8 (b) and FIG.8 (c). As shown in FIG. 8B, the motor 82 is energized in a state where the swing gear 81 is not engaged with any of the sorting gears 76 a and 76 b, and a counterclockwise rotational force is applied to the fourth gear 90. Explaining the case, the fifth gear 92 engaged with the fourth gear 90 rotates in the clockwise direction, and the swing gear 81 rotates in the counterclockwise direction. The direction of rotation is indicated by an arrow in FIG.

  Here, in this embodiment, a friction torque is generated between the swinging gear 81 and the swinging member 96b by the friction applying member 99. Therefore, when the swinging gear 81 tries to rotate counterclockwise. On the contrary, clockwise friction torque is generated in the swing member 96b. Since the swing members 96a and 96b are pivotally supported around the swing center 93, the swing members 96a and 96b swing clockwise (CW direction) around the swing center 93.

  That is, when the fifth gear 92 rotates clockwise, the swing members 96a and 96b swing clockwise around the swing center 93, and the swing gear 81 swings together with the swing members 96a and 96b. Mesh with the sorting gear 76a. When the fifth gear 92 further rotates in the clockwise direction, the sorting gear 76a meshes with the swing gear 81 and rotates clockwise as shown in FIG. 8C. Therefore, the rotating plate gear 75a meshing with the sorting gear 76a is rotated counterclockwise, the rotating plate 73a acts on the connecting plate 65a, and the first door opening means 61a is protruded. As a result, the left refrigerator door 2a opens.

  Further, since the magnet 94 swings integrally with the swing member 96b and approaches the switch detection 95a, the switch detection 95a is turned on.

  Next, the conditions under which the drive torque can be transmitted while the oscillating gear 81 and the sorting gear 76a are kept engaged as described with reference to FIG. 8C will be described with reference to FIGS. .

  As described above, the oscillating gear 81 is supported so as to oscillate around the oscillating center 93 together with the oscillating member 96. Therefore, when the driving force is transmitted from the oscillating gear 81 to the sorting gear 76a. Since the reaction force applied to the oscillating gear 81 from the sorting gear 76a acts on the meshing of the gears, the operation will be described.

  The driving torque is transmitted using the oscillating gear 81 as a driving gear and the sorting gear 76a, which is a mating counterpart, as a driven gear. Since the oscillating gear 81 is configured to oscillate around the oscillating center 93 as already described, when the driving torque is transmitted from the oscillating gear 81 to the distributing gear 76a, the meshing is reliably maintained and the driving torque is maintained. It is desirable that the reaction force generated in the meshing portion acts in the direction in which the swing gear 81 is pressed against the sorting gear 76a.

  Such preferred conditions will be described with reference to FIG. 9. In FIG. 9, the fourth gear 90 rotates counterclockwise as in FIG. 8C, and the fifth gear 92 and the sixth gear 97 rotate in the clockwise direction. The switching means 80 oscillates clockwise (CW direction) by the action of the friction load torque generated by the friction applying member 99 provided between the oscillating member 96b and the oscillating gear 81. A state in which the dynamic gear 81 and the sorting gear 76a mesh with each other at the meshing point 100 to transmit a driving force is illustrated.

  Here, since the driving torque is transmitted from the swing gear 81 to the distribution gear 76a, the swing gear 81 becomes a drive gear and the distribution gear 76a becomes a driven gear.

  The direction of the transmission force F1 transmitted from the oscillating gear 81 to the distributing gear 76a is the pressure angle of the gear with respect to a straight line that passes through the meshing point 100 and connects the oscillating gear 81 and the distributing gear center 77a. Inclined by α, α = 20 ° in a general involute gear.

  Here, if the torque to be transmitted is T and the distance from the distribution gear center 77a to the transmission force F1 is R, it is expressed as T = F1 × R. That is, F1 = T / R. Here, the oscillating gear 81 receives a meshing reaction force F2 that is equal in magnitude and opposite to the transmission force F1 from the sorting gear 76a at the meshing point 100. Further, the swing center 93 and the sorting gear center 77a are located on opposite sides of the meshing reaction force F2.

  If the distance from the mesh reaction force F2 to the swing center 93 is r, the mesh reaction force F2 generates a moment of M1 = F2 × r around the swing center 93 with respect to the switching means 80, and its direction As is clear from FIG. 9, it is clockwise (CW direction) with respect to the swing center 93. The direction of the moment is a direction in which the swing gear 81 is pressed against the sorting gear 76a.

  That is, when the opening force for opening the refrigerator compartment door 2a protrudes from the member 61a via the connecting plate 65a and the rotating plate 73a and is applied to the engagement position as the engagement reaction force F2, the swing gear 81 is moved to the distribution gear 76a. Therefore, it is preferable that the oscillating gear 81 and the sorting gear 76a are not disengaged from each other.

  The switching means 80 in FIGS. 8 to 9 has been described with respect to the configuration in which the motor 82 is rotated in the forward rotation direction to rotationally drive the left rotation plate 73a. However, when the motor 82 is rotated in the reverse rotation direction, the switching means 80 is rotated. FIG. 8 to FIG. 9 are symmetrical to each other, and the oscillating gear 81 is engaged with the right distributing gear 76a to drive the right rotating plate 73a.

  On the other hand, an example of a case where it is not suitable will be described with reference to FIG. FIG. 10 differs from FIG. 9 in that the position of the sorting gear 76a is close to the fifth gear 92 with respect to the switching means 80, and the swinging center 93 and the sorting gear center 77a are in meshing reaction force F2. Located on the same side with respect to.

  If the distance from the meshing reaction force F2 to the rocking center 93 at this time is r ′, the meshing reaction force F2 has a moment of M2 = F2 × r ′ around the rocking center 93 with respect to the switching means 80. As shown in FIG. 10, the direction is counterclockwise (CCW direction) with respect to the swing center 93. The direction of the moment is a direction in which the swing gear 81 is separated from the sorting gear 76a.

  Therefore, when the load torque for opening the refrigerator compartment door 2a is applied to the engagement point 100 as the engagement reaction force F2 from the first door opening means 61a via the connecting plate 65a and the rotation plate 73a, the swing gear Since 81 moves around the swing center 93 in a direction away from the sorting gear 76a, the meshing is released and so-called tooth skipping occurs.

  As described with reference to FIGS. 9 and 10, whether or not the meshing of the swing gear 81 and the sorting gear 76 a is the direction to be pressed by the driving torque or the direction to be separated is determined at the meshing point 100. This is because the direction of the moment generated around the oscillation center 93 is reversed depending on whether the oscillation center 93 and the distribution gear center 77a are opposite to each other or the same side with respect to the meshing reaction force F2 generated. .

  In this embodiment, the switching means 80 is arranged so that the swing center 93 and the split gear center 77a are located on the opposite sides with respect to the meshing reaction force F2 at the mesh point 100 of the swing gear 81 and the split gear 76a. And the sorting gear 76a are preferable because the meshing of the gears can be stabilized.

  Next, the operation when the door opening device 60 in the present embodiment opens the left refrigerator compartment door 2a will be described with reference to FIGS. 6 and 11 to 13.

  FIG. 6 shows the “origin position” of the door opening device 60 of the present embodiment as described above, and shows a reference state before the door opening operation is performed. That is, the swinging gear 81 of the switching means 80 is not meshed with any of the sorting gears 76a and 76b, and the outputs of the switching detections 95a and 95b are both OFF. Moreover, the door opening means position detection 72a, 72b is also in an OFF state.

  11 shows that the motor 82 is driven in the normal rotation direction from the “origin position” shown in FIG. 6, and the switching means 80 swings clockwise (CW direction) around the swing center 93. Reference numeral 81 denotes a state in which it is engaged with the sorting gear 76a. The switching means 80 at this time is in the state shown in FIG. 8C, the switching detection 95a is turned on, the switching means 80 is swung, and the swinging gear 81 and the sorting gear 76a are engaged. Is detected.

  FIG. 12 also shows a state in which the motor 82 is further driven in the forward rotation direction. The sorting gear 76a meshes with the oscillating gear 81 and rotates clockwise in the figure (CW direction), and the rotating plate integral with the rotating plate 73a. The gear 75a meshes with the sorting gear 76a and rotates counterclockwise in the figure (CCW direction), and the rotating plate 73a acts on the stepped portion 67a of the connecting plate 65a so that the connecting plate 65a and the connecting plate 65a are integrated with the first. The door opening means 61a is moved downward in the figure, that is, to the front side of the case 62 and protrudes by H1. The spring 70a is extended by H1 as compared with the state of FIGS.

  FIG. 13 also shows a state in which the motor 82 is further driven in the forward rotation direction. The sorting gear 76a meshes with the oscillating gear 81 and further rotates clockwise (CW direction) in the drawing, and rotates integrally with the rotating plate 73a. The plate gear 75a meshes with the sorting gear 76a and further rotates counterclockwise in the figure (CCW direction), and the rotating plate 73a further acts on the stepped portion 67a of the connecting plate 65a to be integrated with the connecting plate 65a and the connecting plate 65a. The protruding member 61a is further moved to the front side of the case 62, and protrudes by H2 which is the maximum protruding amount. The spring 70a has a maximum length that is extended by H2 as compared with the state of FIGS.

  Since the magnet 71a provided on the connecting plate 65a is close to the door opening means position detection 72a, and the door opening means position detection 72a detects the magnetic force and is turned on, the connecting plate 65a and the connecting plate 65a are integrated with the first. It can be detected that the door opening means 61a protrudes the maximum amount.

  When it is detected that the door opening means position detection 72a is turned ON, if the polarity applied to the motor 82 is reversed and the motor is rotated in the reverse direction, the gears from the motor 82 to the rotating plate 73a are respectively shown. It rotates in the direction opposite to the arrow direction. If the motor 82 rotates in the reverse direction, the first door opening means 61a starts to be pulled into the case 62, so the magnet 71a provided on the connecting plate 65a is separated from the door opening means position detection 72a and the door opening means. The position detection 72a is turned off.

  When the motor 82 is further rotated in the reverse direction, the door opening device 60 is in the state of FIG. 11 through FIG. 12, and the first door opening means 61a is in the retracted state.

  When the motor 82 further rotates in the reverse direction, the switching means 80 swings in a direction in which the swing gear 81 is disengaged from the sorting gear 76a, and returns to the “origin position” in FIG. At this time, since the magnet 94 provided on the swing member 96b is separated from the switching detection 95a, the switching detection 95a is turned off, and it can be confirmed that it is the “origin position”.

  That is, the motor 82 is rotated in the forward rotation direction from the “origin position”, the first door opening means 61a is protruded to open the left refrigerator compartment door 2a, and then the motor is rotated in the reverse rotation direction to thereby rotate the first door. The opening means 61a can be pulled in and returned to the “origin position”.

  In the “origin position”, the switching means 80 is in a neutral position, and the driving force from the motor 82 is not transmitted to the first door opening means 61a and the second door opening means 61b. When the door opening device 60 does not operate, it is at the origin position. Therefore, even if the first door opening means 61a and the second door opening means 61b are pulled out by some external force, the reduction gear train 83 and the motor 82 are provided. Is not forcibly driven via the rotary plates 73a and 73b.

  Next, the operation when the door opening device 60 in the present embodiment opens the right refrigerator compartment door 2b will be described using FIG. 6 and FIGS.

  FIG. 6 shows the “origin position” of the door opening device 60 of the present embodiment as described above, and shows a reference state before the door opening operation is performed.

  14 shows that the motor 82 is driven in the reverse direction from the “origin position” shown in FIG. 6, and the switching means 80 swings counterclockwise (CCW direction) around the swing center 93. Reference numeral 81 denotes a state in which it is engaged with the sorting gear 76b. The switching means 80 at this time is in a position symmetrical to the state shown in FIG. 8C, the switching detection 95b is turned on, the switching means 80 swings, and the swing gear 81 and the sorting gear 76b. It is detected that and are engaged.

  FIG. 15 also shows a state in which the motor 82 is further driven in the reverse direction, and the sorting gear 76b meshes with the oscillating gear 81 and rotates counterclockwise (CCW direction) in the drawing, and is a rotating plate integral with the rotating plate 73b. The gear 75b meshes with the sorting gear 76b and rotates clockwise (CW direction) in the drawing, and the rotating plate 73b acts on the stepped portion 67b of the connecting plate 65b, so that the connecting plate 65b and the protruding member 61b integrated with the connecting plate 65b are integrated. Are moved downward in the figure, that is, to the front side of the case 62, and protrude by H1. The spring 70b is extended by H1 as compared with the state of FIGS.

  FIG. 16 also shows a state in which the motor 82 is further driven in the reverse direction, and the sorting gear 76b meshes with the oscillating gear 81 and further rotates counterclockwise (CCW direction) in the drawing, and rotates integrally with the rotating plate 73b. The plate gear 75b meshes with the sorting gear 76b and further rotates clockwise in the figure (CW direction), and the rotating plate 73b further acts on the stepped portion 67b of the connecting plate 65b to be integrated with the connecting plate 65b and the connecting plate 65b. The protruding member 61b is further moved to the front side of the case 62 and protrudes by H2 which is the maximum protruding amount. The spring 70b has a maximum length that is extended by H2 as compared with the state of FIGS.

  The magnet 94b provided on the connecting plate 65b is close to the door opening means position detection 72b, and the door opening means position detection 72b detects the magnetic force and is turned ON. Therefore, the connecting plate 65b and the connecting plate 65b are integrated with the second plate. It can be detected that the door opening means 61b protrudes the maximum amount.

  When it is detected that the door opening means position detection 72b is turned ON, if the polarity applied to the motor 82 is reversed and the motor is rotated in the normal rotation direction, the gears from the motor 82 to the rotating plate 73b are respectively It rotates in the direction opposite to the arrow direction in FIG. When the motor 82 rotates in the forward rotation direction, the protruding member 61b starts to be pulled into the inside of the case 62. Therefore, the magnet 94b provided on the connecting plate 65b is separated from the door opening means position detection 72b and door opening means position detection 72b. Becomes OFF.

  When the motor 82 is further rotated in the forward direction, the door opening device 60 is in the state shown in FIG. 14 through FIG. 15, and the second door opening means 61b is retracted. When the motor 82 further rotates in the forward direction, the switching means 80 swings in a direction in which the swing gear 81 is disengaged from the distribution gear 76b, and returns to the “origin position” in FIG. At this time, since the magnet 94 provided on the swinging member 96b is separated from the switching detection 95b, the switching detection 95b is turned off, and it can be confirmed that it is the “origin position”.

  That is, the motor 82 is rotated in the reverse direction from the “origin position” to project the protruding member 61b to open the left refrigerator compartment door 2a, and then the motor 82 is rotated in the forward direction to retract the protruding member 61b. It is possible to return to the “origin position”.

  As described above, the operation of opening the left and right refrigerator compartment doors 2a and 2b by the action of the door opening device 60 of the present embodiment will be further described with reference to FIG. In FIG. 17, as an example, an operation of opening the left refrigerator compartment door 2 b after opening the left refrigerator compartment door 2 a is shown.

  In FIG. 17A, the door opening device 60 is at the origin position, the door opening means 61a and 61b are retracted, and the left and right refrigerator compartment doors 2a and 2b are closed.

  In FIG. 17B, the left door switch 48a is operated, the motor 82 of the door opening device 60 rotates in the forward rotation direction, and the first door opening means 61a corresponding to the left refrigerator compartment door 2a protrudes to the left. The state where the refrigerator compartment door 2a is turning clockwise and opening (CW direction) is shown. The left refrigerator door 2a has an angular velocity in the clockwise direction (CW direction) corresponding to the protruding speed of the first door opening means 61a.

  FIG. 17C shows the left refrigerator compartment door having an angular velocity in the clockwise (CW direction) direction while the motor 82 of the door opening device 60 rotates in the reverse direction and the first door opening means 61a is retracted. 2a continues to open with inertia. At this time, since there is a friction torque between the hinge 17a and the left refrigerator compartment door 2a, the left refrigerator compartment door 2a opens while gradually decelerating.

  In FIG. 17 (d), from the state in which the left refrigerator compartment door 2a is opened 90 °, the right door switch 48b is operated, and the motor 82 of the door opening device 60 rotates in the reverse direction to correspond to the right refrigerator compartment door 2b. The second door opening means 61b protrudes and the right refrigerator compartment door 2b is rotated counterclockwise (CCW direction) and opened. The right refrigerator compartment door 2b has a counterclockwise (CCW direction) angular velocity corresponding to the protruding speed of the second door opening means 61b.

  FIG. 17E shows that the motor 82 of the door opening device 60 rotates in the forward direction and the second door opening means 61b is pulled in, while the right refrigeration having an angular velocity in the counterclockwise (CCW direction) direction. The room door 2b continues to open due to inertia. At this time, since there is a friction torque between the door hinge 17b and the right refrigerator compartment door 2b, the right refrigerator compartment door 2b opens while gradually decelerating.

  As described above, the door opening device 60 according to the present embodiment can open the left refrigerator compartment door 2a by operating the left door switch 48a, and can operate the right door switch 48b. The right refrigerator compartment door 2b can be opened.

  Next, the characteristics of the door opening force when opening the refrigerator compartment doors 2a and 2b will be described with reference to FIG.

  In FIG. 18, the horizontal axis represents the open angle of the refrigerator compartment doors 2a and 2b, θd = 0 is the closed state of the refrigerator compartment doors 2a and 2b, θdmax is the maximum open angle, and one of the refrigerator compartment doors 2a and 2b is shown. The state which the part contact | abutted to the stopper which is not shown in figure, for example, the wall surface etc. which adjoined to the installation place of the refrigerator main body 1 is shown. θ1 is an angle φ2 at which the closing mechanism 37 described above acts to apply a closing force to the refrigerator compartment doors 2a and 2b, and θ2 is the first door opening means 61a and the second door opening of the door opening device 60. This is the angle at which the refrigerator doors 2a, 2b are pushed open by the means 61b. The vertical axis represents the opening force of the refrigerator compartment doors 2a and 2b, and may be expressed by, for example, the torque around the hinge 17, or at the door end or the handle portion farthest from the hinge 17 of the refrigerator compartment doors 2a and 2b. It may be expressed by attractive force.

  As described above, the door packing 15 is provided around the refrigerator compartment doors 2a and 2b to prevent the leakage of cold air. The door packing 15 incorporates a magnet and is attracted to the front surface of the heat insulating box 10 so that no gap is formed. Therefore, when the refrigerator doors 2a and 2b start to open, the door packing 15 attracted by the magnet is pulled. Since the opening force is required for peeling off, the opening force is large, and even if it is opened slightly, the magnetic attraction force of the magnet will decrease rapidly, so the opening force will decrease rapidly.

  Further, since the left refrigeration chamber door 2a is provided with the rotation threshold 18, when the left refrigeration chamber door 2a is opened, the rotation threshold 18 is swung around the rotation threshold fulcrum 19 to be substantially the same as the left refrigeration chamber 2a. Since the opening force for rotating to the orthogonal position is further added, the opening force at the beginning of opening becomes larger than that of the right refrigerator compartment door 2b.

  The fulcrum load is a friction torque generated mainly by the frictional resistance of the door hinge 17 and is uniformly generated over the entire range of the opening angle.

  That is, the opening force of the refrigerator compartment doors 2a and 2b is the maximum at θd = 0 at the beginning of opening, decreases sharply to θ1 that is the closer range, and uniform friction until θdmax that is the maximum opening angle. There is a feature that torque is generated.

  Next, a preferable opening characteristic when the refrigerator doors 2a and 2b are opened by the opening device 60 will be described with reference to FIG.

  FIG. 19A is a graph showing preferred angular velocity characteristics of the refrigerator compartment doors 2a and 2b, in which the horizontal axis represents time and the vertical axis represents the angular velocity of the refrigerator compartment doors 2a and 2b. FIG. 19B is a graph showing the angular displacement characteristics corresponding to FIG. 19A, in which the horizontal axis indicates time, and the vertical axis indicates the opening angle of the refrigerator compartment doors 2a and 2b.

  The operator operates the left door switch 48a or the right door switch 48b to open the refrigerator compartment doors 2a and 2b, energizes the door opening device 60, and opens the first door 61a or the second door. When the means 61b operates, the refrigerator compartment doors 2a and 2b perform an opening operation so as to open toward the operator. At this time, since it is desirable for the operator to open the refrigerator compartment doors 2a and 2b so that a natural impression can be felt without a sense of incongruity in the movement of the door, the characteristics will be described.

  Needless to say, the refrigerator doors 2a and 2b are in a stopped state at a speed = 0, and in order to perform the door opening operation from the stopped state, an acceleration motion in which the speed is accelerated from 0 is performed. Since the refrigerator door is a revolving door, its movement is angular acceleration, but for the sake of clarity, it is simply described as acceleration.

  In order to obtain a door opening operation that gives a natural impression to the operator, the refrigerator doors 2a and 2b are smoothly and uniformly accelerated during the operation of the first door opening means 61a and the second door opening means 61b. It is desirable to do. Here, the uniform acceleration motion is a uniform acceleration motion, and the velocity changes linearly during the uniform acceleration motion.

  Here, since the uniform acceleration motion is the most common motion of an object in the natural world, it can be felt as natural. For example, the motion of an object during free fall is a constant acceleration motion, or the motion of an object that decelerates while sliding on a friction surface is a constant acceleration motion in a negative direction.

  In this way, all the motions that accelerate and decelerate while the object receives a certain force are equal acceleration motions, so it is a natural motion because it is a motion that is seen daily.

  Therefore, a natural opening operation can be obtained by performing an opening operation similar to a uniform acceleration motion even in the refrigerator compartment door.

  The speed of an object that performs uniform acceleration increases or decreases at a constant rate in time. That is, in the door opening device 60 in the present embodiment, the protruding operation of the first door opening means 61a and the second door opening means 61b is started at a low speed at the beginning of the protruding, and the speed is gradually increased to finish the protrusion. By giving a speed characteristic such that the maximum speed can be obtained immediately before, it is possible to obtain an acceleration feeling close to a uniform acceleration motion, and it is possible to obtain an automatic door opening device 60 in which a door opening operation can be naturally felt. The operation of the first door opening means 61a and the second door opening means 61b is a linear motion, and the refrigerator compartment doors 2a and 2b are rotational motions, so their motion directions and units are different, but will be described later with reference to FIG. Thus, since there is a proportional relationship between the speed of the first door opening means 61a and the second door opening means 61b and the angular speed of the refrigerator compartment doors 2a and 2b, the first door opening means 61a and the second door opening means 61a The door opening means 61b performs a behavior approximating a uniform acceleration motion, so that the refrigerator compartment doors 2a and 2b behave similar to a uniform angular motion.

  In the graph of angular velocity shown in FIG. 19A, the refrigerator doors 2a and 2b are closed at time t = 0. At t = 0, the door opening device 60 is energized to operate the door opening device 60.

  From t = 0 to t1, the first door opening means 61a and the second door opening means 61b are protruded in the door direction to open the refrigeration room doors 2a and 2b while accelerating. That is, the operation of the left refrigerator compartment door 2a in FIGS. 17A to 17B described above or the operation of the right refrigerator compartment door 2b in FIGS. 17C to 17D is described. During the acceleration range, the angular velocity increases uniformly with time, so the graph becomes a straight line that rises to the right and reaches the maximum angular velocity ωdmax at t = t1.

  From t = t1 to t = t2, the refrigerator doors 2a and 2b are no longer accelerated by the first door opening means 61a and the second door opening means 61b, and are in the inertia range that continues to open with inertia. . That is, the operation of the left refrigerator compartment door 2a in FIGS. 17 (b) to 17 (c) described above or the operation of the right refrigerator compartment door 2b in FIGS. 17 (d) to 17 (e) is performed. During the inertia range, the refrigerator compartment doors 2a and 2b receive frictional resistance from the hinges 17a and 17b, so that the refrigerator compartment doors 2a and 2b continue to open due to inertia and gradually decelerate. The frictional resistance is generally a constant force obtained by multiplying the mass and the coefficient of friction. In the case of a rotary hinge as in this embodiment, the diameter of the portion that supports the mass of the refrigerator compartment doors 2a and 2b. Friction torque corresponding to is generated.

  While the refrigerator doors 2a and 2b are opened by inertia, they are decelerated by a constant friction torque, so that the angular velocity between the inertia ranges decreases uniformly with time, and the graph becomes a straight line to the right, and at t = t2, This is a constant acceleration motion that stops in contact with a stopper (not shown).

  On the other hand, when the friction coefficient of the door hinge 17 is negligibly small, the angular velocity does not decrease in the deceleration range, so the angular velocity remains constant at the maximum angular velocity ωdmax as shown by the broken line.

  In the graph of angular displacement shown in FIG. 19B, in the acceleration range from time t = t0 to t1, the open angle θd of the refrigerator compartment increases in a quadratic curve that is convex downward. Further, in the inertia range from time t1 to t2, the open angle θd of the refrigerator compartment increases like a quadratic curve convex upward, and reaches the maximum open angle θdmax at t = t2. At t = t1, the quadratic curve that protrudes downward and the quadratic curve that protrudes upward are continuous. Here, if θdmax is set to an angle of 90 ° or more, the opening operation by the opening device 60 in the present embodiment opens the refrigerator compartment doors 2a and 2b sufficiently to take in and out food. Easy to use and suitable.

Next, a preferable opening operation time when the refrigerator doors 2a and 2b are opened by the door opening device 60 will be described.
In general, the reflection time of a person is 0.4 to 0.5 seconds. For example, when driving a car, from the time when a danger is detected and it is determined that braking is necessary, the accelerator pedal is used. It is known as the time to move the foot.

  Since people cannot react to phenomena that occur in a shorter time than this reflection time, such phenomena are too fast and feel awkward and feel uncomfortable. Therefore, when opening the refrigerator compartment doors 2a and 2b using the door opening device, the time t1 from when the refrigerator compartment doors 2a and 2b start to open until the maximum velocity or the maximum angular velocity ωmax is reached is 0.4 seconds. If the setting is made as described above, the operator can react to the operation in which the refrigerator compartment door 2 opens to the front, so that the opening operation does not feel abrupt and feels natural.

  On the other hand, if the time t1 is excessive, the door opening operation seems to be unnaturally slow, so by setting it to be 0.8 seconds or less, which is slightly slower than the reflection time of the person at the maximum. Thus, the door opening operation by the door opening device 60 is not too fast and sudden, and an appropriate door opening operation that is not too late can be obtained.

  That is, it is preferable that the time t1 from when the refrigerating chamber doors 2a and 2b start to open until reaching the maximum speed or the maximum angular speed ωdmax is 0.4 seconds <t1 <0.8 seconds.

  As described above, in order to realize a natural door opening operation, it is desirable to approximate the door opening characteristic to a constant acceleration or a constant angular acceleration motion.

  Furthermore, it is desirable to set the time t1 from when the refrigerator compartment door 2 starts to open until the maximum speed or the maximum angular speed is reached to 0.4 seconds or more and 0.8 seconds or less. Further, it is desirable that the projecting members 61a and 61b of the door opening device 60 perform an operation approximating a uniform acceleration motion by rotating the motor 82 at a constant rated rotational speed, for example, without performing special speed control.

  An example of a configuration that can provide such preferable door opening operation characteristics will be described with reference to FIGS. The description will explain the configuration of the rotating plate 73a, the connecting plate 65a, and the first door opening means 61a corresponding to the left refrigerator compartment door 2a, but the rotating plate 73b, connecting plate 65b, corresponding to the right refrigerator compartment 2b, The second door opening means 61b has a mirror image configuration that is symmetrical to that of FIGS.

  FIG. 20 is a diagram illustrating the relationship between the steps 101A to 101J and the steps 102a to 102j provided on each of the connecting plate 65a and the rotating plate 73a provided in the door opening device 60 in the present embodiment. For the sake of explanation, the connecting plate 65a and the rotating plate 73a are drawn so as to be separated from each other on the left and right in the drawing, but actually, as explained in FIG. 6, the connecting plate 65a is rotated by the tension of the spring 70a. Since it is urged | biased toward the board 73a, as shown in FIG. 21, the connection board 65a and the rotation board 73a will be in the state which each corresponding level | step difference contacted.

  FIG. 21 is a diagram for explaining the configuration and operation in which the rotating plate 73a rotates counterclockwise (CCW direction) to move the connecting plate 65a and the first door opening means 61a.

  20, the connecting plate 65a provided with the stepped steps 101A to 101J is provided with the first door opening means 61a, and along the guide rail 66a shown in FIG. 6, the case 62 of the door opening device 60 is provided. Is supported so as to be slidable in the front-rear direction along the left side surface.

  When the rotating plate 73a is rotated counterclockwise (CCW direction) in the drawing, the steps 102a to 102j on the outer periphery of the rotating plate 73a and the steps 101A to 101J provided on the connecting plate 65a are engaged with each other, and the connecting plate 65a follows the guide rail 66a. Moving in the direction of the arrow, the first door opening means 61a protrudes from the front surface of the case 62 of the door opening device 60, and opens the left refrigerator compartment door 2a.

  That is, in FIG. 20, the configuration of the rotating plate 73a and the connecting plate 65a will be described in detail. The step 102a provided on the rotating plate 73a is provided at a position from the rotating plate center 74a to the radius r1, and the second step 102b. Are provided from the radius r1 to the radius r2 and sequentially from the third step 102c having the radius r3 to the ninth step 102j having the radius r9. Here, r1 <r2 <r3 <r4 <r5 <r6 <r7 <r8 <r9. The first step 101A provided on the connecting plate 65a meshes with the first step 102a of the rotating plate, and the ninth step 101J and the ninth step 102j of the rotating plate 36 sequentially rotate with the rotating plate 73a. It is a structure that meshes with the corresponding step.

  In this embodiment, the rotating plate 73a rotates counterclockwise (CCW direction) when the left refrigerator compartment door 2a is opened.

  As described above, the connecting plate 65a is provided with the first door opening means 61a and is movable in the direction of the arrow along the guide rail 66a. 20 and 21, the left direction in the drawing is the front side of the refrigerator 1, and the left refrigerator compartment door 2a is opened by the first door opening means 61a moving to the left.

  In this embodiment, each of the steps 101 and 102 has nine steps, but the number of steps is not limited to nine, and may be, for example, about five steps.

<Rotating plate origin>
Here, at the position of the rotating plate 73a shown in FIGS. 20 to 21 (1), the step 102 of the rotating plate 73a and the step 101 of the connecting plate 65a do not contact each other, and the first door is opened. Since the means 61a is pulled into the case 62 of the door opening device 60, the position of the illustrated rotating plate 73a is set as the origin, and when the series of door opening operations are completed, the position returns to this origin position.

  A magnet 71a is provided on a part of the connecting plate 65a, and will be used to detect the protruding operation completion position of the first door opening means 61a, which will be described in detail later.

  <Operation of Projecting Member (Door Opening Means)> Next, with reference to FIG. 21, the operation of the connecting plate 65a and the first door opening means 61a being moved by the rotating action of the rotating plate 73a to open the left refrigerator compartment door 2a will be described. To do.

  In FIG. 21 (1), the rotating plate 73a is at the origin position, and the door opening switch 48a is pressed to energize the door opening device 60, and the rotating plate 73a starts rotating in the counterclockwise direction of the arrow.

21 (2) shows that the second step 102b of the rotating plate 73a contacts the second step 101B of the connecting plate 65a, the connecting plate 65a moves in the direction of the arrow, and the first door opening means 61a is the front surface of the case 62. The state which protruded from the left refrigerator door 2a has started to open is shown.
In FIG. 21 (3), the rotating plate 73a further rotates, the third step 102c of the rotating plate 73a contacts the third step 101C of the connecting plate 65a, and the connecting plate 65a is further moved in the direction of the arrow.
In FIG. 21 (4), the rotating plate 73a further rotates, the fourth step 102d of the rotating plate 73a comes into contact with the fourth step 101D of the connecting plate 65a, and the connecting plate 65a further moves in the direction of the arrow.
In FIG. 21 (5), the rotating plate 73a further rotates, the fifth step 102e of the rotating plate 73a contacts the fifth step 101E of the connecting plate 65a, and the connecting plate 65a further moves in the direction of the arrow.
In FIG. 21 (6), the rotating plate 73a further rotates, the eighth step 102h of the rotating plate 73a contacts the eighth step 101H of the connecting plate 65a, and the connecting plate 65a further moves in the direction of the arrow.
In FIG. 21 (7), the rotating plate 73a further rotates, the ninth step 102j closest to the outer periphery of the rotating plate 73a contacts the ninth step 101J of the connecting plate 65a, and the connecting plate 65a further moves in the direction of the arrow. The first door opening means 61a moves and protrudes by the maximum protruding amount H2, and the protruding speed of the first door opening means 61a becomes the maximum speed.

  Since the magnet 71a provided on the connecting plate 65a is close to the door opening means position detection 72a which is, for example, a Hall IC, the door opening means position detection 72a is turned on to stop driving the rotating plate 73a. Thereafter, the rotating plate 73a rotates in the reverse direction, that is, in the clockwise direction in the figure (CW direction), and returns to the origin position shown in FIG. 21 (1) from the state shown in FIG. 21 (7) through FIG. 21 (2). .

  Next, speed characteristics of the connecting plate 65a, the first door opening means 61a, and the refrigerator compartment door 2a will be described with reference to FIGS. 21 to 23 and FIG. 20 as appropriate.

  FIG. 22 is a graph showing the protruding speed characteristics of the first door opening means 61a. The horizontal axis represents time, and the vertical axis represents the protruding speed of the first door opening means 61a.

  FIG. 23 is a diagram showing the relationship between the protruding speed of the first door opening means 61a and the speed at the end of the door farthest from the door hinge 17 of the refrigerator compartment door 2a.

  As shown in FIGS. 20 and 21 (1) to 21 (7), the steps 101A to 101J and steps 102a to 102j provided on the connecting plate 65a and the rotating plate 73a have the smallest radius r1. The meshing starts from the first steps 102a and 101A, and finally meshes with the radius gradually increasing until the radius reaches r9, and the rotational movement of the rotating plate 73a is made to open the first door with the connecting plate 65a. It converts into the linear motion of the means 61a. With this configuration, when the motor 82 rotates at a constant rated rotational speed and the rotating plate 73a rotates at an appropriate rotational speed reduced by the reduction gear train 83, the connecting plate 65a and the first door The moving speed of the opening means 61a is low at the beginning of movement, and has an acceleration characteristic that gradually increases and finally reaches the maximum speed. The degree of this acceleration is represented by the ratio between the maximum radius r9 and the minimum radius r1 of the rotating plate 73a, that is, r9 / r1.

  In FIG. 22, t = 0 indicates the state of FIG. 21 (1), and is the time when the first door opening means 61a starts to operate.

When the rotational speed of the rotating plate 73a is N (rpm), the angular speed ω (rad / s) of the rotating plate is
ω = (N / 60) × 2π (Equation 1)
Therefore, the speed V1 of the first door opening means 61a at this time is the tangential speed of the portion of the radius r1,
V1 = ω × r1 = (N / 60) × 2π × r1 (Equation 2)
It becomes. This V1 is very low speed, and is accelerated from a stop state at zero speed.

t = t1 shows the state of FIG. 21 (7), and the speed V9 of the first door opening means 61a at this time is the tangential speed of the portion of the radius r9.
V9 = ω × r9 = (N / 60) × 2π × r9 (Equation 3)
Thus, as is clear from Equations 2 and 3, the speed of the first door opening means 61a is proportional to the ratio of the radii of the steps engaged between the rotating plate 73a and the connecting plate 65a.

  That is, as described above, since there is a relationship of r1 <r2 <r3 <r4 <r5 <r6 <r7 <r8 <r9, the ratio of r2 / r1, the ratio of r3 / r2, and the radius of the adjacent step If the ratio is substantially constant, the speed V of the first door opening means 61a increases in proportion to the rotation angle of the rotating plate 73a. With this configuration, if the motor 82 is rotated at a constant rated rotational speed without performing special speed control, for example, the rotating plate 73a rotates at a constant rotational speed, and the first door opening means Since the speed of 61a gradually increases from the start of movement, the first door opening means 61a can perform a motion close to a uniform acceleration motion.

  When t = t1, the motor 82 is stopped to stop the rotating plate 73a, and then the motor 82 is reversely rotated to return to the origin.

The relationship between the protruding speed of the first door opening means 61a and the speed at the end of the door farthest from the hinge 17 of the refrigerator compartment door 2a will be described with reference to FIG. The protruding speed of the first door opening means 61a is V (mm / sec), the distance from the hinge 17 to the protruding member is Rd (mm), the distance from the hinge 17 to the farthest door end is Ld (mm), If the tangential speed at the end of the door farthest from the hinge 17 is W (mm / sec) and the angular speed of the refrigerator compartment door 2a is ωd (rad / sec),
ωd = V / (2 × π × Rd) = W / (2 × π × Ld) (Equation 4)
Therefore, the relationship between the tangential speed W at the door end furthest from the hinge 17 and the protruding speed V of the first door opening means 61a is
W = (Ld / Rd) × V (Equation 5)
Thus, it is proportional to the ratio between the width of the refrigerator compartment door 2a when the door hinge 17 is set as the reference position and the mounting position of the first door opening means 61a.

  Therefore, if the first door opening means 61a performs a movement approximating a uniform acceleration movement, the refrigerator door 2a also performs a movement approximating a uniform acceleration movement, so that a natural opening method can be obtained.

  According to the door opening device of the present embodiment, if the motor 82 is rotated at a constant rotational speed, the first door opening means 61a performs a movement that approximates a uniform acceleration movement. Therefore, if the motor 82 is rotated at a constant speed without performing special speed control, a natural opening operation can be performed. Therefore, the control circuit has a simple configuration and a natural impression with an inexpensive configuration. Opening operation can be realized.

  Next, the characteristic of the protruding force by the first door opening means 61a will be described with reference to FIG. 18, FIG. 20, and FIG.

  As described above with reference to FIG. 18, the opening force characteristic when the refrigerator compartment door 2 is opened is that the opening force for tearing off the door packing 15 attracted by the magnet at the beginning of opening of the refrigerator compartment doors 2 a and 2 b. Since it is necessary, the opening force is large, and even if it is opened even slightly, the magnetic attraction force of the magnet decreases rapidly, so that the opening force decreases rapidly.

  Therefore, as a preferable characteristic of the protruding force of the first door opening means 61a, a characteristic that maximizes the protruding force at the start of the opening operation is desirable.

  As described with reference to FIGS. 21 (1) to 21 (7), in the door opening device 60 in the present embodiment, the steps 101A to 101J and the step 102a provided on each of the connecting plate 65a and the rotating plate 73a. To 102j, meshing starts from the first steps 102a and 101A having the smallest radius r1 and finally meshes until the radius reaches r9, where the radius gradually increases, and the rotational movement of the rotating plate 73a Is converted into a linear motion of the connecting plate 65a and the first door opening means 61a.

  With such a configuration, when the motor 82 rotates at the rated rotation speed of the constant output torque and the rotation plate 73a rotates at an appropriate rotation speed decelerated by the reduction gear train 83, the first rotation from the connection plate 65a is performed. The protruding force transmitted to the door opening means 61a is large at the beginning of movement, has a protruding force characteristic that gradually decreases and finally becomes the minimum. The degree of reduction of the protruding force is represented by the ratio between the minimum radius r1 and the maximum radius r9 of the rotating plate 73a, that is, r1 / r9.

  As described above, the protruding force by the first door opening means 61a has a characteristic that becomes maximum at the start of the opening operation of the refrigerator compartment door 2a, and this characteristic is the refrigerator compartment door 2a described with reference to FIG. The opening characteristics of 2b, that is, the opening force is required to peel off the door packing 15 attracted by the magnet at the beginning of opening, so the opening force is large. The opening device 60 according to the present embodiment has an effect that the opening force characteristic suitable for opening the refrigerator compartment door can be obtained.

  As described above, by setting the time t1 from when the refrigerator compartment door 2 starts to open until reaching the maximum speed or the maximum angular speed to 0.4 seconds or more and 0.8 seconds or less, the opening operation is suddenly performed. I feel that it is natural movement without feeling too late.

  In the door opening device 60 in the present embodiment, the driving force transmitted from the motor 82 to the fourth gear 90 via the reduction gear train 83 swings via the fifth gear 92 and the sixth gear 97. The rotation is transmitted to the gear 81, further rotates the rotating plate gear 75a via the sorting gear 76a, and rotates the rotating plate 73a, thereby moving the connecting plate 65a and the first door opening means 61a. The time from when the first door opening means 61a protrudes and completes the operation until the refrigerator compartment door 2a reaches the maximum speed or the maximum angular speed is from the position of FIG. 21 (1) to the position of FIG. 21 (7). The rotation time is equal to the “extrusion operation time” in which the first door opening means 61a performs the ejection operation.

  Here, if the speed reduction ratio from the motor 82 to the rotating plate 73a is set appropriately, the time until the rotating plate 73a rotates from the position shown in FIG. 21 (1) to the position shown in FIG. The time can be set to 0.4 second or more and 0.8 second or less. Therefore, by requiring an appropriate time for the door opening operation, it is possible to realize the door opening operation that feels natural and not sudden.

Next, the influence on the door opening characteristics due to the amount of food stored in the door pocket 13 will be described.
In the door opening device 60 in the present embodiment, the reduction gear ratio is set so that the protruding operation time of the door opening operation is 0.4 seconds or more, so no food is contained in the door pocket 13. Even when the refrigerator compartment doors 2a and 2b are the lightest in their own weight, the protruding operation time does not become 0.4 seconds or less. Therefore, the refrigerator compartment doors 2a and 2b are not accelerated suddenly in a short time of 0.4 seconds or less and suddenly opened.

  Moreover, as already demonstrated, the protrusion force by the protrusion member 61a has the characteristic which becomes the maximum at the time of the start of opening operation of the refrigerator compartment door 2a. When a large amount of food, for example, about 5 kg to 10 kg of food is stored in the door pocket 13, the inertial mass is larger than the case of only the weight of the refrigerator compartment doors 2a and 2b, and the protruding speed is somewhat higher. Although the speed is low, if the driving torque of the motor 82 and the reduction gear ratio of the reduction gear are set appropriately, the influence of the speed reduction can be reduced to a level that the operator cannot clearly feel.

  For example, in the output torque when the motor 82 rotates at the rated rotation speed, even if the food with the maximum weight is stored in the door pocket 13, the protruding operation time is set to 0.8 seconds or less. From the case where the food stored in the door pockets 13 of the refrigerator compartment doors 2a and 2b is small and the refrigerator compartment door is lightweight, the operation time is extended over the entire range from the case where a large amount of food is contained and the refrigerator compartment door is heavy. Since t1 can be set to 0.4 seconds or more and 0.8 seconds or less, the door opening operation is not too fast and suddenly felt, and the door opening operation is not too slow. Can provide.

  Further, even when the door is light, the protruding operation time t1 does not become 0.4 seconds or less, so the acceleration during the opening operation is small, and an excessive force due to impact is applied to the food stored in the door pocket 13. Therefore, even if the door pocket 13 contains food that is vulnerable to vibration and impact, there is an effect that the food is not impacted.

  Furthermore, in the door opening device 60 in the present embodiment, the switching means 80 is provided, and the first door opening means 61a and the second door opening means 61b are configured to operate only in the protruding direction and do not move backward. A space for the first door opening means 61a and the second door opening means 61b to retreat is unnecessary, and the size can be reduced. Further, since the driving force required to move the other door opening means backward is unnecessary, the efficiency of the driving mechanism is high and energy is not wasted. Furthermore, since the operation amount of the first door opening means 61a and the second door opening means 61b can be increased within a limited space, a door opening device with a stable door opening operation can be provided. There is an effect that.

<Block diagram>
Next, the configuration of a control system for controlling the door opening device 60 will be described with reference to FIG.

  FIG. 24 is a block diagram illustrating a configuration of a refrigerator including the door opening device according to the embodiment of the present invention.

  The control board 41 is connected to a power source 42 that generates a direct current of a predetermined voltage from a commercial power source. Furthermore, it is connected to a control panel 40 having an operation means 43a such as a push button switch for adjusting temperature and a display means 43b such as a blinking LED. Further, the temperature sensors 44, 45, 46, 47, the refrigeration temperature zone cold air control means 20, the freezing temperature zone cold air control means 21, the compressor 51, the door opening device 60, and the door sensor 49 for detecting that the door is opened. , Etc., to drive and control them. In addition, the control panel 40 is arrange | positioned in FIG. 1 on the front surface of the refrigerator main body 1, the front surface of the refrigerator compartment door 2a as an example, and improves usability when a user changes or confirms various functions. ing.

  The refrigerator door 2a is provided with a left door switch 48a, the refrigerator door 2b is provided with a right door switch 48b, and the control board 41 is operated when the left door switch 48a or the right door switch 48b is operated. Send a signal to.

  The motor 82 of the door opening device 60, the switching detections 95a and 95b, and the door opening means position detections 72a and 72b are connected to the control board 41. In addition, power necessary for driving the door opening device 60 and the control board 41 is supplied from the power source 42.

  The control panel 40 may be provided with notification means for notifying the user that the door is in a half-door state. As an example of this notification means, a buzzer is sounded or a lamp is turned on or blinked.

<Initialization>
FIG. 25 is a flowchart showing control of the initialization operation when the power is turned on in the door opening device 60 according to the embodiment of the present invention. The control board 41 is activated when the power is turned on, and executes the initialization program shown in FIG.
(Step S101) The switch detection 95a, 95b door opening means position detection 72a, 72b, the temperature sensors 44, 45, 46, 47, and the door sensor 49 are confirmed, and initial setting is started.
(Step S102) The switching detections 95a and 95b are confirmed, and if it is OFF / OFF, the switching means 80 can confirm that it is at the origin position, and thus the initialization program is terminated.
(Step S103) The switching detections 95a and 95b are confirmed. If ON / OFF, the process proceeds to step S104.
(Step S104) It can be confirmed that the switching means 80 is not at the origin position, and the swing gear 81 is in a position meshed with the left sorting gear 76a.
(Step S105) The motor 82 is driven in the reverse direction, that is, the side where the switching means 80 moves to the origin.
(Step S106) It is confirmed whether or not the left switching detection 95a is changed from ON to OFF. When turned off, the process proceeds to step S107.
(Step S107) The motor 82 is stopped and the initialization program is terminated.
(Step S108) The switch detections 95a and 95b are confirmed. If OFF / ON, the process proceeds to step S109.
(Step S109) It can be confirmed that the switching means 80 is not at the origin position, and the swing gear 81 is in a position meshed with the right sorting gear 76b.
(Step S110) The motor 82 is driven in the forward rotation direction, that is, the side where the switching means 80 moves to the origin.
(Step S111) It is confirmed whether or not the right switching detection 95b is changed from ON to OFF. If turned off, the process proceeds to step S112.
(Step S112) The motor 82 is stopped and the initialization program is terminated.
As described above, the switching means 80 is at the origin position where the swing gear 81 is not meshed with any of the left and right sorting gears 76a and 76b.

  <Opening Control> A procedure for opening control when the refrigerator doors 2a and 2b are opened will be described with reference to FIGS. FIG. 26 is a flowchart showing a procedure of opening control when the left refrigerator compartment 2a is opened, and FIG. 27 is a flowchart showing a procedure of opening control when the right refrigerator compartment 2b is opened. FIG. 28 is a timing chart showing a procedure of opening control when the left refrigerator compartment 2a is opened, and FIG. 29 is a timing chart showing a procedure of opening control when the right refrigerator compartment 2b is opened.

The procedure of opening control when opening the left refrigerator compartment 2a will be described with reference to FIG. The control board 41 executes the door opening program shown in FIG.
(Step S120) The opening operation is started.
(Step S121) The control board 41 monitors the states of the switching detection 95 and the door opening means position detection 72 to confirm whether or not the door opening device 60 is at the origin position.

If it is not at the origin position, the initialization program from (step S101) to (step S112) shown in FIG. 25 is executed.
(Step S122) The depression of the opening switch 48a of the left refrigerator compartment door 2a is monitored, and if the opening switch 48a is operated, the process proceeds to (Step S123).
(Step S123) The motor 82 is energized in the forward rotation direction, that is, the polarity that rotates the switching means 80 in the direction in which the swing gear 81 meshes with the left sorting gear 76a from the origin position.
(Step S124) When the left switching detection 95a changes from OFF to ON, the process proceeds to (Step S125).
(Step S125) After confirming that the switching means 80 swings and the swing gear 81 is in a position meshed with the left sorting gear 76a, the routine proceeds to (Step S126).
(Step S126) It is monitored whether the first door opening means position detection 72a is turned on from OFF, and when it is turned on, the process proceeds to (Step S127).
(Step S127) Since it is confirmed that the first door opening means 61a protrudes and completes the operation, the process proceeds to (Step S128).
(Step S128) The polarity of the voltage applied to the motor 82 is reversed, and the motor 82 is rotated in the reverse direction.
(Step S129) It is monitored that the first door opening means position detection 72a is turned from ON to OFF, and when it is turned OFF, it is confirmed that the pulling-in operation is in progress (Step S130).
(Step S130) It is monitored that the left switching detection 95a is turned from ON to OFF, and when it is turned OFF, the process proceeds to (Step S131).
(Step S131) Confirm that the switching means 80 swings and returns to the origin.
(Step S132) The motor is stopped and the opening control is finished.
The door opening operation of the left refrigerator compartment 2a is thus completed.

The procedure of opening control when opening the right refrigerator compartment 2b will be described with reference to FIG. The 41 control boards execute the door opening program shown in FIG.
(Step S220) The opening operation is started.
(Step S221) The control board 41 monitors the state of the switching detection 95 and the protruding member position detection 72 to check whether or not the door opening device 60 is at the origin position.

If it is not at the origin position, the initialization program from (step S101) to (step S112) shown in FIG. 25 is executed.
(Step S222) The depression of the opening switch 48b of the right refrigerator compartment door 2b is monitored, and if the opening switch 48b is operated, the process proceeds to (Step S223).
(Step S223) The motor 82 is energized in the reverse direction, that is, the polarity that the switching means 80 rotates in the direction in which the swing gear 81 meshes with the right sorting gear 76b from the origin position.
(Step S224) When the right switching detection 95b changes from OFF to ON, the process proceeds to (Step S225).
(Step S225) After confirming that the switching means 80 swings and the swinging gear 81 is in a position meshed with the right sorting gear 76b, the process proceeds to (Step S226).
(Step S226) It is monitored that the second door opening means position detection 72b is turned from OFF to ON, and when it is turned on, the process proceeds to (Step S227).
(Step S227) Since it is confirmed that the second door opening means 61b protrudes and completes the operation, the process proceeds to (Step S228).
(Step S228) The polarity of the voltage applied to the motor 82 is reversed, and the motor 82 is rotated in the forward direction.
(Step S229) It is monitored that the second door opening means position detection 72b is switched from ON to OFF, and when it is turned OFF, it is confirmed that the pulling-in operation is being performed (Step S230).
(Step S230) It is monitored that the right switching detection 95b is turned from ON to OFF, and when it is turned OFF, the process proceeds to (Step S231).
(Step S231) Confirm that the switching means 80 swings and returns to the origin.
(Step S232) The motor is stopped and the opening control is terminated.
Thus, the opening operation of the right refrigerator compartment 2b is completed.

  Next, when opening the left refrigerator compartment 2a using FIG. 28, each detection operation of the door opening switch 48a, the switching detection 95a, the first door opening means position detection 72a, the door sensor 49a, and the rotation of the motor 82 are performed. The operation procedure will be described.

  At t = 0, the door opening device 60 has already performed the initialization described with reference to FIG.

  The left opening switch 48a is operated by t = t1 and is turned ON. In the present embodiment, the motor 82 is driven in the forward rotation direction from the time when the left opening switch 48a is turned from ON to OFF. Since the motor 82 rotates in the forward rotation direction, the switching means 80 operates, and at t = t2, the swinging gear 81 and the left sorting gear 76a mesh with each other, and the left switching detection 95a is turned on. When the motor 82 continues to rotate in the forward rotation direction, the left protruding member 61a protrudes to open the left refrigerator compartment door 2a, so that the left door sensor 49a that detects the open / closed state of the left refrigerator compartment door 2a is turned on at t = t3. .

  At t = t4, the protruding member position detection 72a is turned on, and it is detected that the protruding member 61a has protruded to complete the operation, so the motor 82 is stopped. Thereafter, when the motor 82 is reversed and rotated in the reverse direction at t = t5, the protruding member position detection 72a is turned OFF, and the protruding member 61a performs a returning operation to be drawn. At t = t6 after the protruding member 61a is retracted, the switching detection 95a is turned off, and it can be seen that the meshing between the swinging gear 81 of the switching means 80 and the sorting gear 76a is released. The motor 82 is further rotated in the reverse direction until the motor 82 returns to the origin position. Since the left refrigerator compartment door 2a is open, the left door sensor 49a remains ON.

  The door opening operation of the left refrigerator compartment 2a by the door opening device 60 is thus completed.

  Next, when the right refrigerator compartment door 2b is opened using FIG. 29, each of the detection operation of the door opening switch 48b, the switching detection 95b, the protruding member position detection 72b, the door sensor 49b, and the rotation operation of the motor 82 are performed. The procedure will be described.

  At t = 0, the door opening device 60 has already performed the initialization described with reference to FIG.

  The right door switch 48b is operated by t = t1 and is turned ON. In the present embodiment, the motor 82 is driven in the reverse direction from the time when the right door switch 48b is turned from ON to OFF. Since the motor 82 rotates in the reverse direction, the switching means 80 operates, the swing gear 81 and the right distribution gear 76b mesh at t = t2, and the right switch detection 95b is turned on. When the motor 82 is continuously rotated in the reverse rotation direction, the right protruding member 61b protrudes to open the right refrigerator compartment door 2b, so that the right door sensor 49b for detecting the open / closed state of the right refrigerator compartment door 2b is turned on at t = t3.

  At t = t4, the protruding member position detection 72b is turned ON, and it is detected that the protruding member 61b has protruded to complete the operation, so the motor 82 is stopped. Thereafter, when the motor 82 is reversed and rotated in the forward direction at t = t5, the protruding member position detection 72b is turned OFF, and the protruding member 61b performs a returning operation to be drawn. At t = t6 after the protruding member 61b is retracted, the switching detection 95b is turned OFF, and it can be seen that the meshing between the swing gear 81 of the switching means 80 and the sorting gear 76b is released. The motor 82 is further rotated in the forward rotation direction until it returns to the origin position. Since the right refrigerator compartment door 2b is open, the right door sensor 49b remains ON.

  The door opening operation of the right refrigerator compartment 2b by the door opening device 60 is thus completed.

<Effect>
According to the above configuration, the first door 2a and the second door 2b supported around the rotation fulcrum, respectively, and the opening device 60 that opens the first door 2a and the second door 2b are provided. The door opening device 60 includes a motor 82 that can rotate forward and backward, a reduction gear train that is a transmission means 83 that transmits the rotation of the motor 82, and transmission of transmission means according to the forward and reverse rotations of the motor 82. A switching means 80 for performing a switching operation for switching the destination, a first door opening means 61a for transmitting a driving force when the switching means 80 is switched to one, and opening the first door 2a, and a switching means 80. A driving force is transmitted when switching to the other, and a second door opening means 61b for opening the second door 2b is provided. That is, the door opening device 60 includes a switching unit 80 that operates by reversing the rotation direction of one motor 82 and performs switching operation for switching the meshing of the gears corresponding to the rotation direction. If it rotates in the direction, the left protruding member 61a (first door opening means) can be moved by the driving force from the motor 82 via the switching means 80 to open the left refrigerator compartment door 2a (first door). When the motor 82 rotates in the reverse rotation direction, the right protruding member 61b (second door opening means) is moved by the driving force from the motor 82 via the switching means 80 to move the right refrigerator compartment door 2b (second door). Can be opened.

  Further, the first door 2a and the second door 2b are provided with closer means 37 for applying a rotational torque in the closing direction within a first angle range from the respective closed positions, and the first door opening means 61a. The opening angle of the first door 2a and the opening angle of the second door 2b by the second door opening means 61b are respectively larger than the first angle. That is, since the opening angle of the refrigerator compartment doors 2a, 2b by the door opening device 60 is larger than the angle at which the closer mechanism 37 that applies the closing force to the refrigerator compartment doors 2a, 2b acts, the door opening device 60 There is an effect that the opening operation by is sure.

  Further, when the motor 82 is rotated at a constant rotational speed, the protruding member 61 (door opening means) performs a movement that approximates a uniform acceleration movement. Therefore, if the motor 82 is rotated at a constant speed without performing special speed control, a natural opening operation can be performed. Therefore, the control circuit has a simple configuration and a natural impression with an inexpensive configuration. Opening operation can be realized.

  In addition, when the food stored in the door pockets 13 of the refrigerator compartment doors 2a and 2b is small in quantity and the refrigerator compartment door is lightweight, the protruding operation is performed in the entire range from the case where a large quantity of food is contained and the refrigerator compartment door is heavy. Since the time t1 can be set to 0.4 seconds or more and 0.8 seconds or less, the door opening operation is not too fast and it is not felt suddenly, and the door opening operation is not too slow, and it is appropriate and natural opening of the door Can provide action. Furthermore, even if the refrigerator door is light, the protruding operation time t1 does not become 0.4 seconds or less, so the acceleration during the opening operation is small, and excessive force due to impact on the food stored in the door pocket 13 Therefore, even when food that is weak against vibration and shock is contained in the door pocket 13, there is an effect that the food is not shocked.

  The first door opening means 61a and the second door opening means 61b are driven forward, and the driving time is shorter in the second half than in the first half. Accordingly, the opening operation of the first door 2a and the second door 2b, which are revolving doors, can be made to be a very natural operation without giving a sudden impression similar to the operation manually performed by the user. it can.

  Further, since the switching means 80 is provided and the protruding member 61 operates only in the protruding direction and does not move backward, a space for the protruding member 61 to move backward is unnecessary, and the size can be reduced. Further, when the one protruding member 61 is moved forward, the driving force required to move the other protruding member 61 backward is unnecessary, so that the efficiency of the driving mechanism is high and energy is not wasted. Furthermore, since the amount of operation of the protruding member 61 can be increased within a limited space, there is an effect that it is possible to provide a door opening device with a stable door opening operation.

1 Refrigerator body 2 Refrigerated room (refrigerated temperature zone)
2a First door (left refrigeration room door, refrigeration room door)
2b Second door (right refrigerator compartment door, refrigerator compartment door)
13 Door pocket 15 Packing 17 Hinge 18 Rotating partition 19 Rotating partition fulcrum 37 Closer mechanism (closer means)
40 control panel 41 control board 48 door opening switch 49 door sensor 51 compressor 60 door opening device 61 door opening means (protruding member)
61a First door opening means (left protruding member)
61b Second door opening means (right protruding member)
62 Case 63 Opening 64 Door opening means distal end portion 65 Connecting plate 66 Guide rail 67 Stepped portion 68 Spring receiver 69 Spring receiver 70 Spring 71 Magnet 72 Door opening means position detection (projecting member position detection)
73 Rotating plate 74 Rotating plate center 75 Rotating plate gear 76 Distribution gear 77 Distribution gear center 80 Switching means 81 Oscillating gear 82 Motor 83 Transmission means (reduction gear train)
84 Worm gear 85 Worm wheel 86 Worm wheel shaft 87 Second gear 88 Third gear 89 Third support shaft 90 Fourth gear 91 Fourth support shaft 92 Fifth gear 93 Swing center 94 Magnet 95 Switch detection 96 Oscillating member 97 Sixth gear 98 Oscillating gear center 99 Friction adding member 100 Engagement point 101 Step (connecting plate)
102 Step (Rotating plate)

Claims (5)

A first door and a second door, each supported around a rotation fulcrum;
An opening device for opening the first door and the second door;
The opening device is a motor capable of forward and reverse rotation;
A reduction gear train for transmitting rotation of the motor;
Switching means for performing a switching operation for switching the transmission destination of the reduction gear train in accordance with forward rotation and reverse rotation of the motor;
Driving force is transmitted when the switching means is switched to one side, and the first door opening means opens the first door;
A driving force is transmitted when the switching means is switched to the other, and the second door opening means opens the second door;
A door opening device characterized by comprising:   2. The door opening device according to claim 1, wherein an operation time of the first door opening means and the second door opening means is not less than 0.4 seconds and not more than 0.8 seconds. apparatus. The first door and the second door comprise closer means for applying a rotational torque in the closing direction within a first angle range from the respective closed positions;
The angle at which the first door opening means opens the first door and the angle at which the second door opening means opens the second door are larger than the first angle, respectively. The door opening device according to claim 1 or 2. The first door opening means and the second door opening means are driven forward, and the first door opening means and the second door opening means are driven forward in the latter half of the first half. The door opening device according to claim 1, wherein the door opening device is short. A storage chamber provided at the top of the refrigerator body, a first door and a second door supported around the rotation fulcrum at the left end and the right end of the storage chamber,
An opening device provided at the top of the refrigerator body to open the first door and the second door;
The opening device is a motor capable of forward and reverse rotation;
A reduction gear train for transmitting rotation of the motor;
Switching means for performing a switching operation for switching the transmission destination of the reduction gear train in accordance with forward rotation and reverse rotation of the motor;
Driving force is transmitted when the switching means is switched to one side, and the first door opening means opens the first door;
A driving force is transmitted when the switching means is switched to the other, and the second door opening means opens the second door;
A refrigerator characterized by comprising.