JP2009113745A - Electromagnetic absorber for vehicles - Google Patents

Abstract

A highly practical electromagnetic absorber for a vehicle is provided.
A screw rod having one end supported by a spring upper part and formed with a male screw, and a nut 84 supported by the spring lower part and screwed into the screw rod are provided. In accordance with the relative movement of the spring, the nut rotates and the screw rod and the nut move relative to each other. In the electromagnetic absorber 10 that generates a resistance force relative to the lower part, the fluid filled in the housings 60 and 64 that covers at least the portion where the screw rod and the nut of the screw mechanism are screwed together is cooled. To be configured. By comprising in this way, it becomes possible to suppress the temperature rise of the screw mechanism accompanying the relative motion of the spring upper part and the spring lower part.
[Selection] Figure 1

Description

  The present invention relates to a vehicular absorber, and more specifically, an electromagnetic type that generates a resistance force against the relative motion between an upper part and an unsprung part based on a force generated by an electromagnetic motor (hereinafter sometimes referred to as “motor force”). Relates to the vehicle absorber.

In the field of vehicles, in recent years, development of an electromagnetic absorber having a function of attenuating the relative vibration between the sprung portion and the unsprung portion based on the motor force has been advanced. The absorber described in the following patent document is an example of the electromagnetic absorber.
JP 2005-256924 A JP 2002-257189 A JP 2005-256889 A JP 2006-177478 A

  Many of the electromagnetic absorbers described in the above-mentioned patent documents employ a rotary electromagnetic motor, and convert the rotational force of the electromagnetic motor into a resistance force against the relative motion between the spring top and the spring bottom. The screw mechanism is adopted. In an electromagnetic absorber that employs a screw mechanism, the screw rod and nut rotate and move relative to each other with the relative movement of the spring upper portion and the unsprung portion. The temperature of the screw mechanism may increase. For this reason, in an electromagnetic absorber that employs a screw mechanism, it is considered that practicality is improved by suppressing the temperature rise of the screw mechanism. This invention is made | formed in view of such a situation, and makes it a subject to provide the electromagnetic-type absorber for vehicles with high practicality.

  In order to solve the above-described problems, an electromagnetic absorber for a vehicle according to the present invention includes a screw rod having one end supported by one of a spring upper part and a spring lower part to form a male screw, and the other of the spring upper part and the spring lower part. And a nut that is screwed with the screw rod, and either the screw rod or the nut rotates and the screw rod and the nut move relative to each other in accordance with the relative movement of the spring upper portion and the unsprung portion. And a vehicular electromagnetic that generates a resistance force against the relative motion between the spring upper part and the spring lower part by applying a rotational force to one of the screw rod and the nut based on the motor force. The type absorber is configured to cool a fluid filled in a housing surrounding at least a portion where the screw rod and the nut are screwed together.

  In the electromagnetic absorber according to the present invention, the screw mechanism is provided in the fluid, and the fluid can be cooled. Therefore, according to the electromagnetic absorber according to the present invention, the relative motion between the spring upper part and the spring unsprung is achieved. It is possible to suppress the accompanying temperature rise of the screw mechanism, and a highly reliable absorber is realized. By having such an advantage, the absorber of the present invention becomes highly practical.

Aspects of the Invention

  In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the claimable inventions, and is not intended to limit the combinations of the constituent elements constituting those inventions to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention. In each of the following items, each of items (1) to (11) corresponds to each of claims 1 to 11.

(1) A screw rod having one end supported by one of the spring upper portion and the spring lower portion to form a male screw, and a nut supported by the other of the spring upper portion and the spring lower portion and screwed to the screw rod. A screw mechanism having a structure in which one of the threaded rod and the nut rotates and the threaded rod and the nut move relative to each other in accordance with relative movement between the spring upper part and the spring unsprung part;
An electromagnetic absorber for a vehicle, comprising: an electromagnetic motor that applies a rotational force to one of the threaded rod and the nut, and that generates a resistance force relative to the relative motion between the spring upper portion and the unsprung portion depending on the rotational force. There,
The vehicle electromagnetic absorber is
A housing filled with a fluid in a state surrounding at least a portion where the screw rod and the nut are screwed together in the screw mechanism;
The electromagnetic absorber for vehicles provided with the cooling system for cooling the said fluid.

  In an electromagnetic absorber that employs a screw mechanism, the screw rod and nut rotate and move relative to each other in accordance with the relative movement between the spring upper part and the spring unsprung part. The temperature of the screw mechanism may increase. In the aspect described in this section, a screw mechanism, more specifically, a place where the nut and the screw rod are screwed is provided in the fluid, and the fluid can be cooled. According to the aspect described in this section, it is possible to suppress an increase in the temperature of the screw mechanism that accompanies the relative movement between the spring upper part and the spring lower part, and a highly reliable absorber is realized.

  The specific structure of the “cooling system” described in this section is not particularly limited. For example, the cooling system may be a structure that cools the fluid filled in the housing by cooling the housing. The structure may be provided inside the housing to cool the fluid. Further, a circulation path for circulating the fluid outside the housing may be provided, and the fluid may be cooled in the circulation path.

  The electromagnetic absorber according to the aspect of this section is not limited to the one that can generate only the resistance force. For example, the propulsive force that positively moves the upper and lower portions of the spring and the input from the outside. It may also be possible to generate a force that prevents relative movement between the sprung portion and the unsprung portion. In that case, if the electromagnetic absorber of the aspect of this section is provided corresponding to each wheel, control based on the so-called skyhook damper theory that generates damping force against sprung vibration and suppression of roll and pitch of the vehicle body are possible. It is also possible to execute the intended posture control of the vehicle body.

  (2) The vehicle electromagnetic absorber according to (1), wherein the fluid is a liquid.

(3) The vehicle electromagnetic absorber is
The internal volume of the housing changes with relative movement between the screw rod and the nut,
A fluid storage device that is provided outside the housing and stores the fluid, and that the fluid can flow between the interior of the housing and the fluid storage device as the internal volume of the housing changes. The vehicle electromagnetic absorber according to the item (2), further comprising a communication path communicating with the vehicle.

  The modes described in the above two items are modes in which the fluid is limited to a liquid. In the former aspect, the liquid may be filled in the housing, or may be contained to such an extent that a portion where the screw rod and the nut are screwed is immersed. However, if the housing is filled with liquid and the internal volume of the housing changes as the screw rod and nut move relative to each other, the absorber is fluid as in the case described in the latter section. It is desirable to provide a device for storing the water, such as a reservoir.

(4) The cooling system is
A fluid cooling device provided outside the housing for cooling the fluid;
The vehicle according to any one of (1) to (3), further including at least one communication path that allows the fluid to flow between the interior of the housing and the fluid cooling device. Electromagnetic absorber.

  The aspect described in this section is an aspect in which the cooling system is specifically limited. In the “cooling system” described in this section, for example, as will be described in detail later, one or more communication passages are two communication passages, and a fluid in the housing circulates through the fluid cooling device. Alternatively, the one or more communication paths may be one communication path, and the fluid may flow between the interior of the housing and the fluid cooling device via the one communication path.

(5) The vehicle electromagnetic absorber is
The partition includes a nut and a partition member that divides the interior of the housing into two fluid chambers, and the internal volume of the two fluid chambers increases with relative movement of the screw rod and the nut. A relatively changing structure,
The vehicle electromagnetic absorber according to any one of (1) to (4), wherein a communication hole for communicating the two fluid chambers with each other is provided in one of the screw rod and the partition member.

  If the cooled fluid stays in the housing, the cooling effect of the screw mechanism may be reduced. In the aspect described in this section, the fluid is allowed to flow inside the housing through the communication hole by using the relative volume change of the two fluid chambers as the screw rod and the nut move relative to each other. It becomes possible to distribute between the fluid chambers. For this reason, according to the aspect described in this section, it is possible to effectively suppress the temperature rise of the screw mechanism.

  The “compartment member” described in this section may include a nut and may be any one that divides the inside of the housing into two fluid chambers. For example, the “compartment member” includes a member that supports the nut in the housing and the nut. It may be made up of only nuts.

  (6) The vehicle electromagnetic absorber according to (5), wherein the communication hole is provided in the nut constituting the partition member.

  The screw rod and the nut constituting the screw mechanism are engaged with each other with the screw rod penetrating the nut, and move relative to each other in the axial direction in accordance with the relative movement between the spring upper portion and the spring lower portion. The portion of the outer periphery of the screw rod where the nut is screwed changes with the relative movement of the spring upper part and the spring unsprung, but the inner peripheral part of the nut is It is always screwed onto the outer periphery of the threaded rod. For this reason, it is desirable to effectively suppress the temperature increase of the nut in terms of the effect of suppressing the temperature increase of the screw mechanism that accompanies the relative motion between the spring upper part and the spring unsprung. According to the aspect described in this section, since the fluid can be circulated through the nut, for example, it is possible to effectively suppress the temperature rise of the nut due to the relative operation of the spring upper part and the spring lower part. Is possible.

(7) The vehicle electromagnetic absorber is
The nut is rotatably held on the other of the sprung portion and the unsprung portion, and the electromagnetic motor is configured to impart a rotational force to the nut,
In at least one opening of the communication hole,
The electromagnetic absorber for a vehicle according to the item (6), further comprising a circulation promoting means for promoting circulation of the fluid through the communication hole using rotation of the nut.

  The mode described in this section is a mode in which the fluid flow is promoted by using the rotational force of the nut. According to the aspect described in this section, it is possible to promote the flow of the cooled fluid in the housing in accordance with the relative motion between the spring top and the spring bottom, and the relative motion between the spring top and the spring bottom is reduced. It is possible to effectively suppress the accompanying temperature rise of the nut. The “distribution promoting means” described in this section may be, for example, a means that promotes introduction of fluid into the communication hole by using rotation of a nut, and communication by using rotation of a nut. It may be a means for promoting the discharge of fluid from the hole. Specifically, for example, a hood may be provided at the opening of the communication hole so that the hood opens with respect to the rotation direction of the nut, and the opening of the communication hole gradually widens. The shape may be a shape like a so-called NACA type duct.

(8) The cooling system is
A fluid cooling device provided outside the housing for cooling the fluid;
And having at least one communication passage communicating the fluid between the interior of the housing and the fluid cooling device so that the fluid can flow therethrough,
The one or more communication paths are
Including two communication passages, one of the two communication passages communicating the fluid between one of the two fluid chambers and the fluid cooling device, and the other of the two communication passages. However, the fluid is communicated between the other of the two fluid chambers and the fluid cooling device so that the fluid can flow therethrough,
The fluid cooling device comprises:
The electromagnetic absorber for a vehicle according to any one of (5) to (7), wherein the fluid is allowed to flow between the two communication passages via itself.

  The aspect described in this section is an aspect in which the structure of the cooling system is further limited. In the aspect described in this section, for example, when a circulation device such as a pump is provided, the fluid in the housing can be circulated through the cooling system, and the fluid can be efficiently cooled. It becomes possible.

(9) At least one of one of the two communication paths, the other of the two communication paths, and the fluid cooling device,
The fluid is prohibited from flowing from one of the two fluid chambers through the fluid cooling device to the other of the two fluid chambers, and the fluid is allowed to flow from the other of the two fluid chambers to the fluid cooling device. The electromagnetic absorber for a vehicle according to item (8), wherein the electromagnetic absorber is configured to allow passage through one of the two fluid chambers.

  The mode described in this section is a mode in which the direction in which the fluid flows is limited in the cooling system. According to the aspect described in this section, for example, the fluid cooled by the fluid cooling device can be prevented from flowing back through the cooling system, and the fluid can be efficiently cooled.

(10) The communication hole is
Allowing the fluid to flow from one of the two fluid chambers to the other of the two fluid chambers, and prohibiting the fluid from flowing from the other of the two fluid chambers to one of the two fluid chambers The electromagnetic absorber for vehicles according to item (8) or (9), which is structured.

  The mode described in this section is a mode in which the structure of the communication hole is limited. In the aspect described in this section, for example, the fluid in the other of the two fluid chambers is transferred to the fluid cooling device by using the relative change in the internal volume of the two fluid chambers accompanying the relative movement of the screw rod and the nut. It is possible to flow in or to allow the fluid inside the fluid cooling device to flow into one of the two fluid chambers, and to cool the fluid efficiently. In the embodiment described in this section, as in the embodiment described in the preceding section, if the flow direction of the fluid in the cooling system is limited, the fluid is in a specific direction, specifically, two fluid chambers. The other of the two communication paths → the fluid cooling device → the one of the two communication paths → the one of the two fluid chambers → the communication hole → the other of the two fluid chambers →. . Therefore, according to such a configuration, it becomes possible to circulate the fluid in the specific direction along with the relative movement of the screw rod and the nut, and the fluid in the housing can be circulated without using a circulation device such as a pump. It is possible to circulate through the cooling system.

  (11) The vehicle electromagnetic absorber according to any one of (1) to (10), wherein the electromagnetic motor is provided inside the housing.

  The mode described in this section is a mode that also suppresses the temperature increase of the electromagnetic motor. In an electromagnetic absorber that relies on the motor force to generate a resistance force relative to the relative movement between the spring top and the spring bottom, it is desirable to suppress the temperature rise of the electromagnetic motor accompanying the operation of the electromagnetic motor. According to the aspect described in this section, it is possible to suppress not only the temperature increase of the screw mechanism but also the temperature increase of the electromagnetic motor.

  Several embodiments of the claimable invention will now be described in detail with reference to the drawings. In addition to the following examples, the claimable invention includes various aspects in which various modifications and improvements have been made based on the knowledge of those skilled in the art, including the aspects described in the above [Aspect of the Invention] section. Can be implemented.

(A) First Embodiment FIG. 1 shows a vehicle shock absorber (hereinafter also referred to as “absorber”) 10 according to an embodiment. For example, as shown in FIG. 2, the absorber 10 is installed in a vehicle as a component of the independent suspension system 20. The suspension device 20 shown in FIG. 2 is a multi-link suspension device, and includes a first upper arm 30, a second upper arm 32, a first lower arm 34, a second lower arm 36, and a toe control arm 38, each of which is a suspension arm. I have. One end of each of the five arms 30, 32, 34, 36, and 38 is rotatably connected to the vehicle body, and the other end is rotatable to an axle carrier 42 that rotatably holds the wheel 40. It is connected. With these five arms 30, 32, 34, 36, and 38, the axle carrier 42 can move up and down so as to draw a substantially constant trajectory with respect to the vehicle body.

  In the suspension device 20 configured as described above, the absorber 10 is arranged in parallel with the coil spring 50. Specifically, they are respectively parallel to each other between a mount portion 54 provided on a tire housing which is a component part of the sprung portion and a second lower arm 36 which is a component portion of the unsprung portion. It is arranged.

  As shown in FIG. 1, the absorber 10 includes a generally cylindrical housing tube 60 and an electromagnetic motor 62 provided above the housing tube 60. The housing tube 60 is fixedly connected at its upper end to a motor case 64 that houses the electromagnetic motor 62, and the motor case 64 is connected to the mount portion 54 via a buffer rubber at the outer periphery thereof. It is connected.

  The electromagnetic motor 62 includes a plurality of coils 70 fixedly arranged on one circumference along the inner surface of the peripheral wall of the motor case 64, bearings 72 on each of the motor case 64 and the housing tube 60 at both ends. , 74 and a cylindrical motor shaft 76 rotatably supported, and a plurality of permanent magnets 78 fixed to the outer periphery of the motor shaft 76 so as to face the coil 70. ing. The electromagnetic motor 62 is a three-phase DC brushless motor including a stator having a coil 70 and a rotor having a permanent magnet 78.

  The absorber 10 includes a screw rod 82 having a thread groove 80 as an external thread formed on the outer peripheral portion in the housing tube 60 and the motor case 64, and a nut 84 that holds a plurality of bearing balls and is screwed into the screw rod 82. And they constitute a ball screw mechanism. More specifically, as shown in FIG. 3, a screw groove 86 is spirally formed on the inner peripheral surface of the nut 84 at a position facing the screw groove 80 of the screw rod 82. A circulation path 88 that communicates both ends of the thread groove 86 is formed. A plurality of bearing balls 92 are accommodated in a passage 90 formed by the thread groove 80 of the screw rod 82 and the thread groove 86 of the nut 84 and a circulation path 88 communicating with both ends of the passage 90. As the screw rod 82 and the nut 84 move relative to each other, the plurality of bearing balls 92 roll in the passage 90 and the circulation passage 88.

  The nut 84 is fixedly fitted to the lower end portion of the motor shaft 76 in a state of being screwed with the screw rod 82. On the other hand, the screw rod 82 is disposed in the housing tube 60 so as to extend in the vertical direction while penetrating the motor shaft 76 of the electromagnetic motor 62, and is fixed to the upper end portion of the support rod 96 at the lower end portion. ing. A lower end portion of the support rod 96 extends from below the housing tube 60, and the support rod 96 is connected to the second lower arm 36 via an attachment bush 98 at the lower end portion. A seal 100 is provided at the lower end of the housing tube 60, and the support rod 96 is in sliding contact with the lower end of the housing tube 60 through the seal 100.

  Note that an annular lower retainer 102 is fixed to the lower end of the support rod 96, and an annular upper retainer 104 is attached to the lower surface side of the mount portion 54 via vibration-proof rubber. The coil spring 50 is supported by the lower retainer 102 and the upper retainer 104 while being sandwiched between them.

  Due to the structure as described above, in the present absorber 10, when the spring top and the spring bottom move relative to each other, the screw rod 82 and the nut 84 move relative to each other, and accordingly, the nut 84 moves relative to the screw rod 82. Rotate. The electromagnetic motor 62 can apply a rotational force to the nut 84, and the absorber 10 can generate a resistance force with respect to the relative movement between the spring upper portion and the spring lower portion by the rotational force. Yes. This resistance force becomes a damping force that attenuates the relative vibration between the sprung portion and the unsprung portion. That is, the absorber 10 can generate a damping force with respect to the relative vibration between the sprung portion and the unsprung portion depending on the motor force generated by the electromagnetic motor 62. Further, the absorber 10 has a function of moving the spring upper part and the unsprung part closer to and away from each other and a function of maintaining the distance between the spring upper part and the unsprung part at a predetermined distance, that is, a function as an actuator. Have. Use this function to execute control based on the so-called skyhook damper theory that applies damping force according to the sprung absolute speed to the vibration of the sprung, roll of the vehicle body during turning, acceleration / deceleration It is possible to effectively suppress the pitch of the vehicle body, adjust the vehicle height, and the like.

  As described above, in the absorber 10, the screw rod 82 and the nut 84 relatively rotate and move relative to each other in accordance with the relative movement between the spring upper part and the spring lower part, and the resistance against the relative movement between the spring upper part and the spring lower part. A motor force is generated to generate a force. For this reason, the temperature of the screw mechanism may increase due to friction between the screw rod 82 and the nut 84, and the temperature of the electromagnetic motor 62 may increase due to the operation of the electromagnetic motor 62.

  In the absorber 10, a coolant as a fluid is filled in the housing 108 of the absorber 10 including the housing tube 60 and the motor case 64, and the inside of the housing 108 includes a nut 84 and a motor shaft. 76, a bearing 74, and the like, which are partitioned into two fluid chambers. Specifically, the lower chamber 110 on the lower side of the partition member composed of the nut 84, the motor shaft 76, the bearing 74, and the like, and the upper side of the nut 84, the motor shaft 76, the bearing 74, etc., the housing 108 and the motor shaft The upper chamber 112 is defined by a space between the motor shaft 76 and a space inside the motor shaft 76. The space between the housing 108 and the motor shaft 76 and the space inside the motor shaft 76 communicate with each other by a notch 116 formed in the lid portion 114 of the motor case 64 to constitute one fluid chamber. Yes.

  The absorber 10 includes a cooling system 120 for cooling the coolant. The cooling system 120 includes a radiator 121 as a fluid cooling device, a communication path 122 that communicates the radiator 121 and the upper chamber 112, and a communication path 123 that communicates the radiator 121 and the lower chamber 110. . The radiator 121 includes an upper tank 124, a lower tank 125, and a radiator core 126 provided therebetween. The radiator core 126 includes a plurality of tubes arranged in a line at a predetermined interval. 127 and cooling fins 128 disposed between adjacent tubes 127. Each of the plurality of tubes 127 communicates coolant so that the coolant can flow between the upper tank 124 and the lower tank 125, and the radiator 121 is cooled by the fins 128 when the coolant passes through the plurality of tubes 127. It is supposed to be a structure. The radiator 121 is provided at the front end portion of the vehicle so as to enhance the cooling effect by the traveling wind. The communication path 122 communicates the upper chamber 112 with the upper tank 124 of the radiator 121, and a check valve that allows only the flow from the upper chamber 112 to the upper tank 124 in the middle of the communication path 122. 129 is provided. On the other hand, the communication path 123 communicates the lower tank 125 of the radiator 121 and the lower chamber 110, and a check valve that allows only the flow from the lower tank 125 to the lower chamber 110 in the middle of the communication path 123. 130 is provided.

  Further, as shown in FIG. 3, the nut 84 is formed with a communication hole 132 that communicates the upper chamber 112 and the lower chamber 110 at each of four equally spaced positions in the circumferential direction. Each of the communication holes 132 is provided with a check valve 133, and the communication hole 132 has a structure that only allows the coolant to flow from the lower chamber 110 to the upper chamber 112. Furthermore, as shown in FIG. 4, a hood 134 is provided in each opening of the communication hole 132 on the lower surface side of the nut 84. FIG. 4 is a perspective view showing the nut 84 as viewed from the vehicle lower side.

  The absorber 10 is provided with a reservoir 136 as a fluid storage device for storing coolant, and the reservoir 136 and the inside of the housing 108 are connected by a communication path 138 that connects them. The housing 108 has a structure in which its internal volume changes as the absorber 10 expands and contracts, that is, the support rod 96 enters or leaves the housing 108. An amount of hydraulic oil corresponding to the change in the internal volume flows in and out between the housing 108 and the reservoir 136 via the communication path 138.

  In the present absorber 10, as described above, the inside of the housing 108 is filled with the coolant, and the cooling system 120 for cooling the coolant is provided. Therefore, the absorber 10 can effectively suppress the temperature rise of the screw mechanism and the electromagnetic motor 62 that accompanies the relative movement between the spring upper part and the spring lower part. Further, since the communication hole 132 is formed in the nut 84, the absorber 10 can further effectively suppress the temperature rise of the screw mechanism accompanying the relative operation of the spring upper part and the spring lower part. is there.

  The communication path 122 of the cooling system 120 is only allowed to flow from the upper chamber 112 to the radiator 121, while the communication path 123 is only allowed to flow from the radiator 121 to the lower chamber 110. Further, the communication hole 132 formed in the nut 84 is only allowed to flow from the lower chamber 110 to the upper chamber 112. For this reason, in the housing 108 of the absorber 10 and the cooling system 120, the coolant can be circulated only in a specific direction. Further, the housing 108 moves relative to the screw rod 82 and the nut 84, that is, as the screw rod 82 enters the upper chamber 112 or exits from the upper chamber 112, the inner volume and the lower volume of the upper chamber 112 are reduced. The internal volume of the chamber 110 is relatively changed. In the absorber 10, the coolant is circulated in the specific direction using the relative movement between the screw rod 82 and the nut 84, that is, the relative change in the internal volume of the two fluid chambers accompanying the expansion and contraction of the absorber 10. .

  More specifically, when the absorber 10 is contracted, the screw rod 82 enters the motor shaft 76, and the internal volume of the upper chamber 112 is relatively reduced. For this reason, as shown by the solid line in FIG. 5, the coolant flows into the radiator 121 from the upper chamber 112 through the communication passage 122, and flows into the lower chamber 110 from the radiator 121 through the communication passage 123. An amount of coolant corresponding to a decrease in the internal volume of the housing 108 due to the support rod 96 entering the housing 108 flows into the reservoir 136 from the lower chamber 110 through the communication path 138. On the other hand, when the absorber 10 is extended, the screw rod 82 is retracted from the inside of the motor shaft 76, and the internal volume of the upper chamber 112 is relatively increased, so that the coolant is as shown by the dotted line in FIG. Then, it flows from the lower chamber 110 into the upper chamber 112 through the communication hole 133. Then, an amount of coolant corresponding to an increase in the internal volume of the housing 108 due to the withdrawal of the support rod 96 from the housing 108 flows into the lower chamber 110 from the reservoir 136 via the communication path 138. As described above, in the present absorber 10, the working oil in the housing 108 is cooled by using the relative change in the internal volume of the two fluid chambers accompanying the expansion and contraction of the absorber 10 without using a circulating device such as a pump. It is possible to circulate through 120.

  As shown in FIG. 4, the hood 134 provided at the opening of the communication hole 132 opens in a direction (solid arrow) in which the nut 84 rotates clockwise from the viewpoint from below. When the nut 84 rotates in that direction, the screw rod 82 moves downward and the absorber 10 extends. For this reason, when the absorber 10 is extended, the coolant is scraped into the communication hole 96 by the hood 134, whereby the circulation of the coolant communication hole 96 is promoted, and the circulation of the coolant in the specific direction is promoted. That is, the absorber 10 is provided with a fluid circulation promoting means constituted by the hood 134.

(B) Second Embodiment FIG. 6 shows a vehicle electromagnetic absorber 140 according to a second embodiment. The absorber 10 of the previous embodiment has a structure in which the nut 84 rotates, whereas the absorber 140 has a structure in which the screw rod rotates. The absorber 140 is arranged in parallel with the coil spring 142, and the absorber 140 and the coil spring 142 are disposed between the mount portion 54 and the second lower arm 36, as in the case of the absorber 10 and the coil spring 50. It is arranged.

  As shown in FIG. 6, the absorber 140 is configured to include a generally bottomed cylindrical lower tube 150 and an upper tube 152 that fits into the lower tube 150 and protrudes upward from the upper end of the lower tube 150. ing. The lower tube 150 is connected to the second lower arm 36 via a mounting bush 154, while the upper tube 152 is fixedly connected to a motor case 158 that houses the electromagnetic motor 156 at the upper end thereof. The motor case 158 is connected to the mount portion 54 via a buffer rubber at the outer peripheral portion thereof.

  The electromagnetic motor 156 includes a plurality of coils 160 that are fixedly arranged on one circumference along the inner surface of the peripheral wall of the motor case 158, a motor shaft 162 that is rotatably held by the motor case 158, and a coil 160. And a permanent magnet 164 fixedly disposed on the outer periphery of the motor shaft 162 so as to face each other. The electromagnetic motor 156 is a motor in which the coil 160 functions as a stator and the permanent magnet 164 functions as a rotor, and is a three-phase DC brushless motor.

  The absorber 140 includes a screw rod 170 having a male screw formed on the outer periphery thereof, and a nut 172 that holds the bearing ball and is screwed with the screw rod 170. The nut 172 is fixedly supported on the upper end portion of a cylindrical nut support member 174 standing on the inner bottom portion of the lower tube 150 in a state of being screwed with the screw rod 170. On the other hand, the screw rod 170 is disposed in the upper tube 152 so as to extend in the vertical direction with its lower end inserted into the nut support member 174, and is fixed to the motor shaft 162 at the upper end. .

  Further, the upper tube 152 is provided with a pair of guide grooves 180 extending in the vertical direction on the inner wall surface thereof, and each of the guide grooves 180 is attached to the upper end portion of the nut support member 174. Each of the pair of keys 182 is fitted, and the nut support member 174 and the upper tube 152, that is, the lower tube 150 and the upper tube 152 cannot be rotated relative to each other by the guide groove 180 and the key 182. In addition, relative movement in the vertical direction is possible. Note that a seal 186 is provided at the upper end of the lower tube 150, and the lower tube 150 is in sliding contact with the upper tube 150 via the seal 186.

  The inside of the housing 188 of the absorber 140 composed of the lower tube 150, the upper tube 152, and the motor case 158 is filled with coolant as a fluid, and the housing 188 has two fluid chambers by nuts 172 and the like. It is divided into. More specifically, it is an upper side of a partition member constituted by the nut 172, the key 182 and the nut support member 174, and is constituted by a space between the upper tube 152 and the screw rod 170 and a space inside the electromagnetic motor 156. The upper chamber 190 is divided into a lower chamber 192 formed by a space between the lower tube 150 and the rod support member 174 and a space inside the rod support member 174. Yes. The space between the upper tube 152 and the screw rod 170 and the space inside the electromagnetic motor 156 communicate with each other by a notch 196 formed below the motor case 158, and the upper chamber 190 which is one fluid chamber. Is configured. On the other hand, the space between the lower tube 150 and the rod support member 174 and the space inside the rod support member 174 communicate with each other through a communication hole 198 formed in the rod support member 174, which is one fluid chamber. A lower chamber 192 is configured.

  The absorber 140 includes a radiator 200 as a fluid cooling device, a communication path 202 that communicates the radiator 200 and the upper chamber 190, and a communication path 204 that communicates the radiator 200 and the lower chamber 192. A system 206 is provided. The radiator 200 has the same structure as the radiator 121 included in the absorber 10 described above, and includes an upper tank 208, a lower tank 210, and a radiator core 212 provided therebetween. Further, the communication path 202 communicates the upper chamber 190 and the upper tank 208 of the radiator 200, and a check valve that allows only the flow from the upper chamber 190 to the upper tank 208 in the middle of the communication path 202. 214 is provided. On the other hand, the communication path 204 communicates the lower tank 210 and the lower chamber 192 of the radiator 200, and a check valve that allows only the flow from the lower tank 210 to the lower chamber 192 in the middle of the communication path 204. 216 is provided.

  In addition, the nut 172 is formed with a communication hole 220 that communicates the upper chamber 190 and the lower chamber 192 at each of four equally spaced positions in the circumferential direction, similarly to the nut 84 provided in the previous absorber 10. . Each of the communication holes 220 is provided with a check valve 222, and the communication hole 220 has a structure that only allows the coolant to flow from the lower chamber 192 to the upper chamber 190. The absorber 140 includes a reservoir 224 as a fluid storage device that stores coolant, and a communication path 216 that connects the reservoir 224 and the lower chamber 192.

  Also in this absorber 140, since the electromagnetic motor 156 and the screw mechanism are provided in the coolant, it is possible to effectively increase the temperature of the screw mechanism and the electromagnetic motor 62 due to the relative movement between the spring upper part and the spring unsprung. It is possible to suppress. Also, in this absorber 140, since the communication passages 202, 204, 226 and the communication hole 220 having the same structure as the communication passages 122, 123, 138 and the communication hole 132 provided in the previous absorber 10 are provided, The coolant in the housing 188 can be circulated through the cooling system 206 without using a circulation device such as a pump.

It is sectional drawing which shows the electromagnetic absorber for vehicles which is 1st Example of claimable invention. It is a figure which shows the suspension apparatus by which the electromagnetic absorber for vehicles of FIG. 1 was arrange | positioned. It is an expanded sectional view which shows the screw mechanism with which the electromagnetic absorber for vehicles of FIG. 1 is provided. It is an expansion perspective view which shows the screw mechanism with which the electromagnetic absorber for vehicles of FIG. 1 is provided. It is a figure which shows notionally the communication relationship between the upper chamber in the housing of the electromagnetic absorber for vehicles of FIG. 1, a lower chamber, a cooling device, and a reservoir | reserver. It is sectional drawing which shows the electromagnetic absorber for vehicles which is 2nd Example of claimable invention.

Explanation of symbols

  10: Vehicle electromagnetic absorber 36: Second lower arm (lower spring) 54: Mount portion (upper spring) 60: Housing tube (housing) 62: Electromagnetic motor 64: Motor case (housing) 74: Bearing (partition member) 76 : Motor shaft (compartment member) 82: Screw rod (screw mechanism) 84: Nut (screw mechanism) (compartment member) 108: Housing 120: Cooling system 121: Radiator (fluid cooling device) 122: Communication path (one or more communication channels) 123) Communication passage (one or more communication passages) 132: Communication hole 134: Hood (distribution promoting means) 136: Reservoir (fluid reservoir) 138: Communication passage 140: Vehicle electromagnetic absorber 150: Lower tube (housing) 152: Upper tube (house 156: Electromagnetic motor 158: Motor case (housing) 170: Screw rod (screw mechanism) 172: Nut (screw mechanism) (partition member) 188: Housing 200: Radiator (fluid cooling device) 202: Communication path (one or more) 204: Communication path (one or more communication paths) 206: Cooling system 220: Communication hole 224: Reservoir (fluid storage device) 226: Communication path

Claims (11)

A screw rod having one end supported by one of an upper part and a lower part and having a male screw; and a nut supported by the other of the upper part and the lower part and screwed to the screw rod; A screw mechanism configured such that one of the screw rod and the nut rotates and the screw rod and the nut move relative to each other in accordance with the relative movement between the upper part and the unsprung part;
An electromagnetic absorber for a vehicle, comprising: an electromagnetic motor that applies a rotational force to one of the threaded rod and the nut, and that generates a resistance force relative to the relative motion between the spring upper portion and the unsprung portion depending on the rotational force. There,
The vehicle electromagnetic absorber is
A housing filled with a fluid in a state surrounding at least a portion where the screw rod and the nut are screwed together in the screw mechanism;
The electromagnetic absorber for vehicles provided with the cooling system for cooling the said fluid.   The electromagnetic absorber for a vehicle according to claim 1, wherein the fluid is a liquid. The vehicle electromagnetic absorber is
The internal volume of the housing changes with relative movement between the screw rod and the nut,
A fluid storage device that is provided outside the housing and stores the fluid, and that the fluid can flow between the interior of the housing and the fluid storage device as the internal volume of the housing changes. The vehicle electromagnetic absorber according to claim 2, further comprising a communication path communicating with the vehicle. The cooling system comprises:
A fluid cooling device provided outside the housing for cooling the fluid;
The vehicle electromagnetic system according to any one of claims 1 to 3, further comprising one or more communication passages that allow the fluid to flow between the interior of the housing and the fluid cooling device. Absorber. The vehicle electromagnetic absorber is
The partition includes a nut and a partition member that divides the interior of the housing into two fluid chambers, and the internal volume of the two fluid chambers increases with relative movement of the screw rod and the nut. A relatively changing structure,
The electromagnetic absorber for vehicles according to any one of claims 1 to 4, wherein a communication hole for communicating the two fluid chambers with each other is provided in one of the screw rod and the partition member.   The electromagnetic absorber for a vehicle according to claim 5, wherein the communication hole is provided in the nut constituting the partition member. The vehicle electromagnetic absorber is
The nut is rotatably held on the other of the sprung portion and the unsprung portion, and the electromagnetic motor is configured to impart a rotational force to the nut,
In at least one opening of the communication hole,
The electromagnetic absorber for vehicles according to claim 6 provided with the distribution promotion means which accelerates the distribution of said communicating hole of said fluid using the rotation of said nut. The cooling system comprises:
A fluid cooling device provided outside the housing for cooling the fluid;
And having at least one communication passage communicating the fluid between the interior of the housing and the fluid cooling device so that the fluid can flow therethrough,
The one or more communication paths are
Including two communication passages, one of the two communication passages communicating the fluid between one of the two fluid chambers and the fluid cooling device, and the other of the two communication passages. However, the fluid is communicated between the other of the two fluid chambers and the fluid cooling device so that the fluid can flow therethrough,
The fluid cooling device comprises:
The electromagnetic absorber for a vehicle according to any one of claims 5 to 7, wherein the fluid is allowed to flow between the two communication passages through itself. At least one of one of the two communication paths, the other of the two communication paths, and the fluid cooling device,
The fluid is prohibited from flowing from one of the two fluid chambers through the fluid cooling device to the other of the two fluid chambers, and the fluid is allowed to flow from the other of the two fluid chambers to the fluid cooling device. The electromagnetic absorber for a vehicle according to claim 8, wherein the electromagnetic absorber is configured to allow passage through one of the two fluid chambers. The communication hole is
Allowing the fluid to flow from one of the two fluid chambers to the other of the two fluid chambers, and prohibiting the fluid from flowing from the other of the two fluid chambers to one of the two fluid chambers The electromagnetic absorber for vehicles according to claim 8 or 9 made into a structure.   The electromagnetic absorber for vehicles according to any one of claims 1 to 10, wherein the electromagnetic motor is provided inside the housing.

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