JP4920095B2 - Electromagnetic solenoid - Google Patents

Description

  The present invention relates to an electromagnetic solenoid, and more particularly to an electromagnetic solenoid including a movable iron core that is movably inserted into a coil wound around a bobbin.

An electromagnetic solenoid basically consists of a cylindrical coil, a fixed iron core provided at the end of the coil, and a movable iron core (plunger) that can move inside the coil. It is a device that converts electrical energy into linear motion by utilizing the fact that the movable iron core is attracted to the fixed iron core by the generated magnetic flux.
This electromagnetic solenoid is used in many fields such as OA equipment such as printers and copying machines, or game machines.

  Here, as an example of a conventional electromagnetic solenoid, there is an electromagnetic solenoid 101 described in Patent Document 1 (FIG. 10). The electromagnetic solenoid 101 is formed of a plate-like magnetic material having a predetermined width, and has a front surface and a back surface, a box-shaped field core 116 having a square front shape, and a bobbin 118 disposed in the field core 116. , A movable core 128 inserted into the axial hole in the center hole 120 of the bobbin 118 communicating with the through hole 114a provided in one side wall of the field core 116 and the through hole 114a. And a fixed iron core 126, a terminal portion 138 having both ends of the coil 122 wound, and a connector portion 134 to which an external connector (not shown) is detachably connected is a field core. The structure provided in the corner part of 116 is comprised.

JP 2002-8919 A

  According to the above conventional example, the electromagnetic solenoid can be reduced in size. However, in recent years, in addition to the demand for downsizing of electromagnetic solenoids incorporated in various devices such as OA equipment or game machines, there is an increasing demand for manufacturing cost reduction.

Here, the electromagnetic solenoid 201 prototyped and examined by the applicant of the present application will be described.
As shown in FIG. 11 (FIG. 11A is a front view (right half sectional view) and FIG. 11B is a right side view), the electromagnetic solenoid 201 includes a box-shaped field core 210, The coil 214 wound around the bobbin 212 disposed in the field core 210, the movable iron core 216 inserted in the center hole 212 a of the bobbin 212 movably in the axial direction, and the inner bottom surface of the field core 210 are fixed. And a fixed iron core 218 disposed at the tip of the center hole 212a of the bobbin 212. Reference numeral 202 denotes an electrical wiring for flowing a current through the coil 214.
With this configuration, the magnetic flux generated when a current flows through the coil 214 causes the movable iron core 216 to be attracted to the fixed iron core 218, and the movable iron core 216 linearly moves in the coil, that is, in the center hole 212a of the bobbin 212. .

As shown in FIG. 11, the field core 210 is formed in a box shape in which the front surface and the back surface are open and the front surface forms a quadrangle by fixing the lid 210 </ b> B to the main body 210 </ b> A.
Further, as shown in FIG. 12 (FIG. 12A is a perspective view of the lid portion 210B, and FIG. 12B is a cross section taken along the line BB), the lid portion 210B of the field core 210 is formed of a plate. A through-hole 210b is formed in the center portion and through which the movable iron core 216 is inserted.

On the other hand, as shown in FIG. 13, the movable iron core 216 is formed by cutting using free-cutting steel, and is provided with a fitting groove 216 a for the E-ring 202 and a slot 216 b for attaching the spring pin 203. The E-ring 202 is fitted in the fitting groove 216a, and the through-hole 216c for attaching the spring pin 203 is provided in the sliding portion 216b. The spring pin is inserted into the through-hole 216c and bridged. 203 is fixed.
A driven member (not shown) receives an axial driving force as the movable iron core 216 moves by being connected to a spring pin.

  As shown in FIG. 13, a rubber washer 204 is provided in contact with the lower surface of the E-ring 202. The rubber washer 204 is a noise reducing member for reducing the impact sound between metals that is generated when the movable iron core 216 enters the coil 214 and the E-ring 202 comes into contact with the lid portion 210B.

Further, as shown in FIGS. 11 and 14, the fixed iron core 218 has a cylindrical shape having a bottom surface, and a protrusion 218a for caulking and fixing to the main body 210A is provided on the lower surface of the bottom surface.
The fixed iron core 218 is fixed to the field core 210 by causing the protrusion 210b to protrude from the through hole 210a of the main body 210A and performing crimping (see FIG. 11A).

  As described above, in the electromagnetic solenoid having the configuration exemplified by the electromagnetic solenoid 201 described above, it is a problem that the number of parts, the number of processing steps, and the number of assembly steps are large, and further reduction in manufacturing cost has been demanded. .

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic solenoid capable of reducing the manufacturing cost by reducing the number of parts, the number of processing steps, and the number of assembly steps.

  The present invention solves the above-described problems by the solving means described below.

The electromagnetic solenoid includes a field core, a coil wound around a bobbin disposed in the field core, and a movable iron core movably inserted in the axial direction into the center hole of the bobbin. The movable iron core is provided with a connecting portion made of a resin material for connecting to a driven member at a rear end portion protruding outward from a center hole of the bobbin, and the connecting portion is formed by insert molding. A base that is integrally formed at the rear end of the movable core, a base, a pair of wall-like portions that are erected on the base, and a bar-like bridge provided between the pair of wall-like portions. The field core includes a main body portion having a U-shaped front surface made of a plate-like magnetic material having a predetermined width and a lid portion fixed to the U-shaped opening position of the main body portion. In a box with a square front shape The lid portion is formed in a plate shape having a through hole through which the movable iron core is inserted, and the lower surface of the connecting portion is at the predetermined position where the movable iron core enters the center hole of the bobbin. It is necessary to contact the upper surface of the part .

  According to the present invention, it is possible to reduce the number of parts, processing man-hours, and assembly man-hours of the electromagnetic solenoid, and the manufacturing cost can be greatly reduced.

It is the schematic which shows the example of the electromagnetic solenoid which concerns on embodiment of this invention. It is the schematic which shows the structure of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the cover part of the field core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the bobbin of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the movable iron core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the movable iron core of an electromagnetic solenoid shown in FIG. 1, and a connection part. It is the schematic which shows the structure of the fixed iron core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the modification of the fixed iron core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the main-body part and fixed iron core of the field core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the example of the electromagnetic solenoid which concerns on the conventional embodiment. It is the schematic which shows the example of the electromagnetic solenoid which the applicant of this application prototyped and examined. It is the schematic which shows the structure of the cover part of the field core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the movable iron core of the electromagnetic solenoid shown in FIG. It is the schematic which shows the structure of the main-body part of a field core of an electromagnetic solenoid shown in FIG. 11, and a fixed iron core.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are schematic views showing an example of an electromagnetic solenoid 1 according to an embodiment of the present invention. FIG. 1A is a front view (right half sectional view), and FIG. FIG. 2 is a perspective view. 3 is a schematic view showing the configuration of the lid portion 10B of the field core 10 in the electromagnetic solenoid 1, FIG. 3 (a) is a perspective view showing the whole, and FIG. It is a perspective view which shows an A line cross section.

As shown in FIGS. 1 and 2, the electromagnetic solenoid 1 according to the present embodiment includes a box-shaped field core 10, a coil 14 wound around a bobbin 12 disposed in the field core 10, and a bobbin 12. The movable iron core 16 is inserted into the central hole 12a so as to be movable in the axial direction, and the fixed iron core 18 is provided at the tip position in the central hole 12a of the bobbin 12 and sucks the movable iron core 16. Reference numeral 2 denotes an electrical wiring for passing a current through the coil 14.
In the present application, the axial direction (the same direction as the longitudinal direction (moving direction) of the movable iron core 16) of the center hole 12a of the bobbin 12 is referred to as “axial direction”, and the direction orthogonal to the axial direction is referred to as “radial direction”.

  As shown in FIGS. 1 and 2, the field core 10 includes a main body portion 10 </ b> A whose front shape is U-shaped, and a U-shaped opening position of the main body portion 10 </ b> A (in this embodiment, a main body opening upward A lid portion 10B fixed in a bridging manner at the upper position of the portion 10A, and is formed in a box shape in which the front surface and the back surface are open and the front surface forms a quadrangle.

Moreover, as shown to Fig.3 (a), the cover part 10B of the field core 10 is formed using a plate-shaped member, and the through-hole 10b which the movable iron core 16 penetrates in the center part is provided.
Here, as a characteristic configuration of the present embodiment, as shown in FIG. 3B, the lid 10B protrudes in the axial direction (here, the direction toward the bobbin 12) at the peripheral edge of the through hole 10b. An annular protrusion 10c is formed. According to this, since the plate | board thickness of the plate-shaped member which forms the cover part 10B can be made thin, the quantity of used material can be reduced and cost reduction can be aimed at. In addition, since the axial length of the through-hole 10b can be made longer than the plate thickness of the plate-like member, the amount of magnetic flux that passes from the through-hole 10b toward the movable iron core 16 is set to, for example, the electromagnetic solenoid 201 or the like. As in the case where the lid portion 210B is formed using a thick plate-like member as shown in FIG.

The bobbin 12 around which the coil 14 is wound is formed of synthetic resin and has a center hole 12a and flange portions 12b and 12c.
Here, as a configuration characteristic of the present embodiment, as shown in FIG. 4, the bobbin 12 has an annular groove 12d into which the annular protrusion 10c of the lid portion 10B is fitted. According to this, since the annular protrusion 10c of the lid portion 10B can be fitted into the annular groove 12d, a compact assembly structure can be realized in the axial direction. Therefore, the effect which contributes to size reduction of the whole electromagnetic solenoid 1 is acquired.

  Further, as shown in FIG. 1, the movable iron core 16 is movable in the axial direction in a through hole 10b provided in the lid portion 10B of the field core 10 and a center hole 12a of the bobbin 12 communicating with the through hole 10b. Has been inserted. As a characteristic configuration of the present embodiment, the movable iron core 16 has a connecting portion made of a resin material for connecting to a driven member (not shown) at a rear end portion protruding outward from the center hole 12a of the bobbin 12. 20 is provided. For example, polyacetal or the like can be used as the resin material.

  Here, FIG. 5 shows a schematic diagram (right half sectional view) of the movable iron core 16, and FIG. 6 shows a perspective view of the movable iron core 16 in a state where the connecting portion 20 is provided. As shown in FIG. 5, the movable iron core 16 has a tip portion formed in a sharp shape so as to be able to enter a fixed iron core 18 to be described later, and a flange-like portion 16 a extending radially in the rear end portion. It is formed in the shape which has. For example, the movable iron core 16 can be formed by forging using a header material. Therefore, compared with the movable iron core 216 (see FIG. 13) in the electromagnetic solenoid 201 described above, in which the E-ring fitting groove and the spring pin mounting portion were formed by cutting using free-cutting steel, Manufacturing costs can be greatly reduced.

On the other hand, as shown in FIGS. 1 and 6, the connecting portion 20 is formed so as to wrap around the flange-like portion 16 a of the movable iron core 16. As an example, the connecting portion 20 includes a base portion 20a, a pair of wall-like portions 20b and 20c erected on the base portion 20a, and a bridge between the pair of wall-like portions 20b and 20c. The provided bar-shaped portion 20d (in the present embodiment, round bar shape) is formed so as to wrap around the flange-shaped portion 16a at the rear end of the movable iron core 16 by insert molding. However, it is not limited to this configuration.
The driven member (not shown) is connected to the rod-shaped portion 20d, and thus receives a driving force in the axial direction as the movable iron core 16 moves. At this time, since the connecting part 20 is provided so as to wrap the brim-like part 16a, the bondability between the movable iron core 16 and the connecting part 20 is improved, and the dissociation can be prevented. It will be a thing.
Further, when the movable iron core 16 is attracted to the fixed iron core 18 by the connecting portion 20 formed of a resin material and enters a predetermined position in the coil 14 (in the center hole 12a of the bobbin 12), the base portion of the connecting portion 20 The lower surface of 20a abuts on the upper surface of the lid 10B, and the movement is stopped, and the impact sound generated at that time can be reduced.

  Furthermore, according to the said structure, compared with the electromagnetic solenoid 201 grade | etc., For example, the structure of the connection part of a movable iron core can be simplified. Specifically, the connecting portion 20 can be configured without using an E-ring, a rubber washer, and a spring pin. Therefore, the part cost can be reduced. Furthermore, since the connecting portion 20 can be integrally provided at the rear end portion of the movable iron core 16 by insert molding, the number of processing steps can be reduced, and the manufacturing cost can be reduced. Thus, a significant cost reduction effect can be obtained by the double reduction effect.

As shown in FIG. 1, the fixed iron core 18 is disposed on the inner bottom surface of the main body 10 </ b> A of the field core 10. Here, as a characteristic configuration of the present embodiment, the fixed iron core 18 is formed in a cylindrical shape having a flange portion 18a extending in the radial direction at the tip portion. Due to the cylindrical shape, the distal end portion of the movable iron core 16 can enter the rear end portion of the fixed iron core 18.
In the present embodiment, as shown in FIG. 1, the fixed iron core 18 is formed in a cylindrical shape having a tapered inner surface, but may be formed in a cylindrical shape having no tapered shape.

Moreover, in this embodiment, although the fixed iron core 18 is formed in the cylindrical shape which has a bottom face as shown in the schematic (right half sectional view) of FIG. 7, as a modification, the schematic of FIG. You may form in the cylindrical shape which does not have a bottom face as shown to a right half sectional view.
In addition, it can also be set as the structure made to act as an electromagnetic solenoid, without providing the fixed iron core 18. FIG.

On the other hand, as shown in FIGS. 1 and 9, a concave portion 10 a into which the flange portion 18 a of the fixed iron core 18 is fitted is provided on the inner bottom surface of the main body portion 10 </ b> A of the field core 10. Here, FIG. 9 is an explanatory diagram illustrating a configuration in which the main body portion 10A of the field core 10 and the fixed iron core 18 are shown and the fixed iron core 18 is fitted to the main body portion 10A of the field core 10.
The fixed iron core 18 is restricted from moving in the radial direction when the flange portion 18 a is fitted into the concave portion 10 a of the field core 10. Further, the flange portion 18a of the fixed iron core 18 is sandwiched between the inner bottom surface of the concave portion 10a of the field core 10 and the lower surface of the bobbin 18 (flange portion 12b), thereby restricting movement in the axial direction (FIG. 1 ( a)). According to this, the fixed iron core 18 can be fixed to the field core without performing processing steps such as caulking, welding, and bonding. Therefore, the manufacturing cost can be reduced by omitting the processing steps.

Next, the operation of the electromagnetic solenoid 1 having the above configuration will be described.
The magnetic flux generated when the coil 14 is energized generates an attractive force between the movable iron core 16 and the fixed iron core 18, and the movable iron core 16 moves in the axial direction toward the fixed iron core 18. At this time, since the movable iron core 16 is connected to a driven member (not shown) at the connecting portion 20, a driving force is applied to the driven member (not shown).
Here, if the current of the coil 14 is kept in the energized state, the state where the movable iron core 16 is attracted to the fixed iron core 18 is maintained. On the other hand, if the current of the coil 14 is cut off, an action of returning to the original position is caused by a restoring force of a driven member (not shown) coupled to the movable iron core 16 or an urging member (not shown).
Note that the structure of the restoring force generating means such as a biasing member (not shown) can be appropriately changed according to the intended use.

  As described above, according to the electromagnetic solenoid according to the present invention, it is possible to reduce the number of parts, the number of processing steps, and the number of assembly steps, so that the manufacturing cost can be greatly reduced.

DESCRIPTION OF SYMBOLS 1 Electromagnetic solenoid 2 Electric wiring 10 Field core 10A Field core main-body part 10B Field core cover part 12 Bobbin 14 Coil 16 Movable iron core 18 Fixed iron core 20 Connection part

Claims (6)

In an electromagnetic solenoid comprising a field core, a coil wound around a bobbin disposed in the field core, and a movable iron core movably inserted in the axial direction into the center hole of the bobbin,
The movable iron core is provided with a connecting portion made of a resin material for connecting to a driven member at a rear end portion protruding outside from a central hole of the bobbin,
The connecting portion is integrally formed at the rear end portion of the movable iron core by insert molding, and includes a base portion, a pair of wall-like portions standing on the base portion, and the pair of wall-like portions. A rod-shaped portion provided in a bridging shape between ,
The field core includes a main body having a U-shaped front surface made of a plate-shaped magnetic material having a predetermined width, and a lid portion fixed to the U-shaped opening position of the main body, and the front shape is rectangular. Formed into a box shape,
The lid is formed in a plate shape having a through hole through which the movable iron core is inserted,
The electromagnetic solenoid according to claim 1, wherein a lower surface of the connecting portion abuts on an upper surface of the lid portion at a predetermined position where the movable iron core enters the center hole of the bobbin . The lid portion has an annular protrusion protruding in the axial direction at a peripheral edge portion of the through hole.
The electromagnetic solenoid according to claim 1. The bobbin has an annular groove into which the annular protrusion of the lid portion is fitted.
The electromagnetic solenoid according to claim 2. A fixed iron core is provided at the tip position in the center hole of the bobbin,
The fixed iron core is formed in a cylindrical shape having a flange portion extending in a radial direction at a tip portion,
The electromagnetic solenoid according to any one of claims 1 to 3, wherein the field core has a concave portion in which a flange portion of the fixed iron core is fitted on an inner bottom surface. The fixed iron core is fixed to the field core by being sandwiched between an inner bottom surface of the recess and a lower surface of the bobbin in a state where a flange portion is fitted in the recess of the field core. 4. The electromagnetic solenoid according to 4. The movable iron core has a flange-like portion extending in the radial direction at the rear end portion,
The connecting part is formed so as to wrap around the brim-like part.
The electromagnetic solenoid according to any one of claims 1 to 5, wherein:

Images