JP2012028449A - Plunger type solenoid and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plunger type solenoid, in which a coming-off prevention structure is provided in a bobbin, and the suction force is increased by the coming-off prevention structure.SOLUTION: The plunger type solenoid has: a cylindrical bobbin 11 with a coil 10 wound around it; a yoke 12 and a stator core 13 constituting a magnetic circuit; a plunger 14 put in a hollow part of the bobbin 11; and a cylindrical bearing 15a put in the hollow part of the bobbin 11, but located outside and fit on the periphery of an axial direction intermediate part 14a of the plunger 14. The plunger 14 has a leading end 14b located in the hollow part of the bobbin 11 and an external dimension enlarged part 14c which is enlarged in external dimension in a direction orthogonal to the axial direction in comparison to that of the axial direction intermediate part 14a. The external dimension enlarged part 14c and bearing 15a constitute a plunger coming-off prevention structure for preventing the plunger 14 from coming off from the bobbin 11.

Description

  The present invention relates to a plunger type solenoid that converts electromagnetic energy into a linear movement of a plunger and a method for manufacturing the same.

  Conventionally, in this type of plunger type solenoid, the plunger is inserted into the hollow portion of the bobbin around which the coil is wound, and the plunger is linearly moved by attracting the plunger by the electromagnetic force of the coil ( For example, Patent Document 1).

  In this prior art, there is a possibility that the plunger may come off from the bobbin during transportation of the plunger type solenoid or in an assembly process for assembling the plunger type solenoid to a product to be assembled (for example, a vehicle).

  Therefore, conventionally, as shown in FIG. 5, a plunger type solenoid having a plunger removal prevention structure for preventing the plunger 14 from coming off the bobbin 11 has been commercialized.

  The plunger detachment prevention structure includes a protrusion 50 that protrudes radially outward from one end portion of the plunger 14 and a stopper 51 that protrudes in parallel with the axial direction of the plunger 14 from the end surface of the bobbin 11.

  The stopper 51 is formed with a hole 51a into which the protruding portion 50 is inserted, and the protruding portion 50 is caught by the inner wall surface of the hole 51a so that the plunger 14 is prevented from coming off.

Japanese Patent Laid-Open No. 2004-314661

  However, the prior art of FIG. 5 has a problem that the physique is enlarged correspondingly because the plunger drop prevention structure, that is, the protrusion 50 and the stopper 51 are provided outside the bobbin 11.

  Further, if the diameter of the plunger 14 is reduced in order to reduce the size of the physique, there arises a problem that the suction area is reduced and the suction force is reduced.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a plunger removal prevention structure inside a bobbin and improve the suction force by the plunger removal prevention structure.

In order to achieve the above object, in the invention according to claim 1, a cylindrical bobbin (11) around which the coil (10) is wound,
A yoke (12) and a stator core (13) constituting a magnetic circuit;
A plunger (14) inserted into the hollow portion of the bobbin (11);
A cylindrical bearing (15a) inserted into the hollow portion of the bobbin (11) and fitted on the outer peripheral side of the axial intermediate portion (14a) of the plunger (14);
The distal end side portion (14b) located in the hollow portion of the bobbin (11) of the plunger (14) has an outer shape enlargement portion in which the outer dimension in the direction orthogonal to the axial direction is larger than that of the axial intermediate portion (14a). 14c)
The outer enlarged portion (14c) and the bearing (15a) are characterized by constituting a plunger removal prevention structure that prevents the plunger (14) from coming off from the bobbin (11).

  According to this, since the plunger removal preventing structure is configured by the outer enlarged portion (14c) and the bearing (15a) of the plunger (14), the plunger removal preventing structure is provided inside the bobbin (11). Further, since the suction area can be increased by the outer shape enlarged portion (14c) of the plunger (14), the suction force can be improved.

  For this reason, while providing a plunger omission prevention structure inside a bobbin, suction force can be improved with a plunger omission prevention structure.

In the invention according to claim 2, in the plunger type solenoid according to claim 1, the plunger (14) comprises at least a first plunger component (17) and a second plunger component (18),
The first plunger component (17) constitutes the axial intermediate portion (14a) of the plunger (14),
The second plunger component (18) constitutes a distal end side portion (14b) of the plunger (14).

  Thereby, the assembly direction of the bobbin (11), the yoke (12), the stator core (13), the plunger (14) and the bearing (15a) can be made the same direction in the manufacturing process of the plunger type solenoid (FIG. 2 described later). See).

Specifically, as the invention according to claim 3, as a manufacturing method for manufacturing the plunger type solenoid according to claim 2,
Fit the bearing (15a) on the outer peripheral side of the first plunger component (17),
The second plunger component (18) is then secured to the first plunger component (17),
Next, the bobbin (11) around which the coil (10) is wound is put on the outside of the second plunger component (18) and the outside of the bearing (15a),
Next, the yoke (12) to which the stator core (13) is fixed in advance may be covered on the outside of the bobbin (11).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is sectional drawing of the plunger type solenoid in 1st Embodiment of this invention. It is explanatory drawing which shows the manufacturing process of the plunger type solenoid of FIG. It is sectional drawing of the plunger type solenoid in 2nd Embodiment of this invention. It is sectional drawing of the plunger type solenoid in 3rd Embodiment of this invention. It is sectional drawing of the plunger type solenoid in a prior art.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described. The plunger type solenoid of the present embodiment can be applied to a shift lever release device of a vehicle automatic transmission.

  As shown in FIG. 1, the plunger-type solenoid includes a cylindrical bobbin 11 (in this example, a flanged cylinder) around which a coil 10 is wound. The coil 10 is disposed inside a yoke 12 that constitutes a magnetic circuit. In this example, the yoke 12 is formed by bending a steel plate, which is a magnetic material, into a horseshoe shape or a substantially U shape.

  A stator core 13, a plunger 14 and a plate member 15 are inserted into the bobbin 11. The stator core 13 constitutes a magnetic circuit, is formed in a columnar shape (in this example, a columnar shape) with a steel material that is a magnetic body, and is appropriately inserted into one end (closed end) of the yoke 12 by appropriate means such as press fitting or caulking. It is fixed.

  The plate member 15 has a cylindrical (cylindrical in this example) bearing 15a inserted into the bobbin 11 and a plate portion 15b that closes the opening end of the yoke 12, and is integrally formed of a steel material. ing. In this example, the planar shape of the plate portion 15b is rectangular.

  The outer edge portion of the plate portion 15 b is caulked to the opening end portion of the yoke 12, whereby the plate member 15 is fixed to the yoke 12. The bearing 15a inserted into the bobbin 11 is located in a range from one axial end portion of the bobbin 11 (the end portion on the plate portion 15b side) to the middle portion in the axial direction.

  The plunger 14 has a columnar shape (columnar in this example), and is inserted into the hollow portion of the bobbin 11 from the plate member 15 side. The axial intermediate portion 14a and the axial one end portion (tip side portion) 14b of the plunger 14 are formed separately from each other by a steel material that is a magnetic body, and then fixed integrally with each other by press-fitting.

  On the other hand, the other axial end portion 14d of the plunger 14 is molded from resin, and the axial intermediate portion 14a is integrated with the axial other end portion 14d by insert molding. In addition, the axial intermediate portion 14a and the other axial end portion 14d of the plunger 14 may be integrally formed of a magnetic material.

  The intermediate portion 14a in the axial direction of the plunger 14 has a constant outer dimension (that is, an outer diameter) in a direction orthogonal to the plunger axial direction, and is slidably inserted into the bearing 15a of the plate member 15. The distal end portion 14 b of the plunger 14 is located between the stator core 13 and the bearing 15 a of the plate member 15.

  The distal end portion 14b of the plunger 14 is formed with an outer enlarged portion 14c in which the outer dimension (that is, the outer diameter) in the direction orthogonal to the plunger axial direction is larger than the axial intermediate portion 14a of the plunger 14. The outer enlarged portion 14 c of the plunger 14 is hooked on the end surface of the bearing 15 a of the plate member 15. That is, the outer enlarged portion 14 c of the plunger 14 constitutes a plunger removal prevention structure together with the bearing 15 a of the plate member 15.

  The difference in outer dimension between the outer enlarged portion 14c of the plunger 14 and the axial intermediate portion 14a (the dimension enlarged by the outer enlarged portion 14c) is smaller than the thickness of the bearing 15a of the plate member 15. Accordingly, a predetermined clearance (gap) is provided between the outer peripheral surface of the outer shape enlarged portion 14 c of the plunger 14 and the inner peripheral surface of the bobbin 11.

  The most distal end portion of the distal end side portion 14b of the plunger 14 located on the distal end side of the outer enlarged portion 14c has a tapered shape, and the stator core 13 has a recess corresponding to the tapered shape of the most distal end portion of the plunger 14. A shape is formed.

  The other end 14 d in the axial direction of the plunger 14 is located outside the bobbin 11. A flange-like portion 14e is formed on the other end 14d in the axial direction of the plunger 14 so as to protrude outward in the radial direction.

  A coil spring 16 serving as a spring means is disposed between the flange-shaped portion 14 e of the plunger 14 and the plate portion 15 b of the plate member 15. The coil spring 16 urges the plunger 14 in a direction in which the plunger 14 tends to come out of the bobbin 11.

  With the above configuration, the plunger type solenoid generates a magnetic flux by energizing the coil 10 and generates an attractive force between the stator core 13 and the plunger 14, so that the plunger 14 resists the spring force of the coil spring 16. Displacement toward the stator core 13 side. When energization of the coil 10 is stopped, the attractive force disappears, and the coil spring 16 is displaced toward the side opposite to the stator core 13 side (right side in FIG. 1) by the spring force to return to the original position.

  Next, the manufacturing method of the plunger type solenoid in this embodiment is demonstrated based on FIG. The up and down arrows in FIG. 2 indicate the upper side and the lower side in the direction of gravity in the manufacturing process of the plunger type solenoid.

  First, as shown in FIG. 2A, the first plunger component 17 is set on the jig 20. The 1st plunger component 17 comprises the axial direction intermediate part 14a and the axial direction other end side part 14d of the plunger 14, and is integrated by insert molding previously. The first plunger component 17 is set on the jig 20 so that the other axial end portion 14d thereof stands upright in the direction of gravity.

  Next, as shown in FIG. 2 (b), the coil spring 16 is placed on the outer peripheral side of the first plunger component 17 from the upper side in the direction of gravity and placed on the flange 14 e of the first plunger component 17.

  Next, as shown in FIG. 2C, the plate member 15 is fitted to the outer peripheral side of the first plunger component 17 from the upper side in the gravity direction and brought into contact with the upper end portion of the coil spring 16.

  Next, as shown in FIG. 2 (d), the second plunger component 18 is press-fitted into the upper end of the first plunger component 17 from the upper side in the gravity direction and fixed. The second plunger component 18 constitutes the distal end side portion 14 b of the plunger 14. Thereby, the plunger 14 is integrally formed by the first plunger component 17 and the second plunger component 18.

  Next, as shown in FIG. 2 (e), the bobbin 11 around which the coil 10 is wound in advance is placed on the outer peripheral side of the plunger 14 from the upper side in the gravity direction, and is fitted on the outer peripheral side of the bearing 15 a of the plate member 15. It is placed on the plate portion 15b of the plate member 15.

  Then, as shown in FIG. 2 (f), the yoke 12 to which the stator core 13 is fixed in advance is placed on the outside of the coil 10 and the bobbin 11 from the upper side in the gravity direction, and the yoke 12 and the plate member 15 are caulked and fixed. In this way, the plunger type solenoid shown in FIG. 1 is manufactured.

  According to the present embodiment, as shown in FIG. 1, in the hollow portion of the bobbin 11, the outer enlarged portion 14 c of the plunger 14 is hooked on the end surface of the bearing 15 a of the plate member 15. It can be prevented from coming off.

  Specifically, it is possible to prevent the plunger 14 from coming off from the bobbin 11 during transportation of the plunger type solenoid or an assembly process for assembling the plunger type solenoid to the vehicle.

  Further, since the outer enlarged portion 14c is formed on the plunger 14, the suction area can be increased as compared with the case where the outer enlarged portion 14c is not formed, and the suction force can be improved. For this reason, the suction force can be improved without increasing the size of the plunger-type solenoid.

  Accordingly, the plunger removal preventing structure is provided inside the bobbin, and the suction force can be improved by the plunger removal prevention structure.

  Here, in the process of manufacturing the conventional plunger-type solenoid shown in FIG. 5, the plunger 14 is inserted into the bobbin 11 in the axial direction (left-right direction in FIG. 5), whereas the protrusion of the plunger 14 The direction in which 50 is inserted into the hole 51a of the stopper 51 is a direction (vertical direction in FIG. 5) orthogonal to the axial direction of the plunger 14. For this reason, since the assembling directions of the respective parts cannot be aligned in one direction, there is a problem that the assembling work of each part is complicated and the assembling work is not easily automated.

  In this respect, in the present embodiment, the distal end side portion 14b having the outer enlarged portion 14c of the plunger 14 is formed separately from the axial intermediate portion 14a, so that a plunger type solenoid as shown in FIG. In the manufacturing process, the assembling directions of the components 11 to 16 can all be the same direction (in this example, the direction from the upper side in the gravity direction toward the lower side in the gravity direction). For this reason, the assembly work of each component 11-16 can be facilitated, and automation of the assembly work is extremely easy.

(Second Embodiment)
In the first embodiment, the distal end side portion 14b of the plunger 14 and the axial intermediate portion 14a are separately formed, but in the second embodiment, as shown in FIG. 3, the distal end side portion of the plunger 14 is formed. 14b and the axial intermediate portion 14a are integrally formed.

  Also in this embodiment, similarly to the first embodiment, the plunger 14 can be prevented from coming off from the bobbin 11 and the suction force can be improved.

  The manufacturing process of the plunger type solenoid of this embodiment will be briefly described. In this embodiment, the distal end side portion 14b and the axial intermediate portion 14a of the plunger 14 are replaced with the remaining portion (the other axial end side of the plunger 14). Form separately from the portion 14d).

  Then, a jig (not shown) is used to place the parts (integral molded part) constituting the distal end side portion 14b and the axial direction intermediate portion 14a of the plunger 14 so that the distal end side portion 14b faces downward in the gravity direction. Set to.

  Next, the plate member 15 is fitted from the upper side in the gravitational direction on the outside of the parts set on the jig (the distal end side portion 14b and the axially intermediate portion 14a of the plunger 14), and then the coil spring 16 is placed on the plate member 15 in the gravitational direction. Cover from above.

  Next, a part (part formed separately) that constitutes the axially other end part 14d of the plunger 14 is fixed to the upper end part (the axially intermediate part 14a of the plunger 14) of the part set in the jig. As a result, the plunger 14 is integrally formed.

  Next, the assembly composed of the plunger 14, the plate member 15 and the coil spring 16 is removed from the jig, and the bobbin 11 around which the coil 10 is wound and the yoke 12 on which the stator core 13 is fixed in advance are attached to the assembly. Assemble sequentially. In this way, the plunger type solenoid shown in FIG. 3 can be manufactured.

(Third embodiment)
In the first embodiment, the axial intermediate portion 14a and the distal end portion 14b of the plunger 14 are integrally fixed by press-fitting. However, as in the third embodiment shown in FIG. The direction intermediate part 14a and the tip side part 14b may be integrally fixed by caulking.

  Specifically, a through hole 14f extending in the axial direction of the plunger 14 is formed in the distal end side portion 14b of the plunger 14, and a protruding portion 14g passing through the through hole 14f is an end of the axial intermediate portion 14a of the plunger 14. Is formed. The protruding portion 14g is formed so as to protrude from the distal end side portion 14b of the plunger 14, and the protruding portion of the protruding portion 14g is crushed so that the axial intermediate portion 14a and the distal end side portion 14b of the plunger 14 The caulking is fixed.

  The direction in which the protruding portion of the protrusion 14g is crushed is the same direction as the assembly direction (the axial direction of the plunger 14) between the axial direction intermediate portion 14a and the distal end side portion 14b of the plunger 14. For this reason, also in the present embodiment, as in the first embodiment, since the assembly directions of the components 11 to 16 can be all made the same in the manufacturing process of the plunger type solenoid, the automation of the assembly work is extremely high. Easy.

(Other embodiments)
In addition, said each embodiment is only what showed the example of the position and shape of the external shape expansion part 14c of the plunger 14, and the position and shape of the external shape expansion part 14c of the plunger 14 are the amount of strokes required and required. It can be appropriately changed according to the suction force or the like.

  For example, in each of the above embodiments, the tip side portion of the distal end portion 14b of the plunger 14 is tapered rather than the outer enlarged portion 14c, but the entire distal end portion 14b of the plunger 14 is the outer enlarged portion 14c. Also good. In this case, the stroke amount is reduced as compared with the above embodiments, but the suction area can be further increased to further increase the suction force.

  For example, the outer enlarged portion 14 c need not be formed over the entire outer periphery of the plunger 14, and the outer enlarged portion 14 c may be formed only in a partial range in the circumferential direction of the plunger 14.

  Moreover, in the said 1st Embodiment, although the plunger 14 is isolate | separated and shape | molded into the two plunger component parts 17 and 18 in the axial direction, it is not limited to this, The plunger 14 is the axis | shaft. It may be molded separately in three or more plunger components in the direction.

  The application object of the plunger type solenoid of the present invention is not limited to the shift lever releasing device of the automatic transmission for vehicles, and the present invention can be widely applied to various uses.

  The present invention has the following features in addition to the features described in the column of means for solving the problems and the claims.

  (1) The distal end portion of the plunger 14 located in the hollow portion of the bobbin 11 has a tapered shape, and the outer shape enlarged portion 14c of the plunger 14 is formed at a position adjacent to the tapered distal end portion. It is characterized by.

  (2) The plunger 14 is divided into the first plunger component 17 and the second plunger component 18 at the boundary between the outer enlarged portion 14c and the axial intermediate portion 14a which is the outer non-enlarged portion. It is characterized by.

  (3) The first plunger component 17 and the second plunger component 18 are formed by press-fitting a protrusion formed at the end of one component into a hole formed at the end of the other component. It is characterized by being fixed to each other.

DESCRIPTION OF SYMBOLS 10 Coil 11 Bobbin 12 Yoke 13 Stator core 14 Plunger 14a Axis axial direction intermediate part 14b Plunger tip side part 14c Plunger external expansion part 15a Bearing 17 First plunger component 18 Second plunger component

Claims (3)

A cylindrical bobbin (11) around which a coil (10) is wound;
A yoke (12) and a stator core (13) constituting a magnetic circuit;
A plunger (14) inserted into a hollow portion of the bobbin (11);
A cylindrical bearing (15a) inserted into the hollow portion of the bobbin (11) and fitted on the outer peripheral side of the axial intermediate portion (14a) of the plunger (14);
Of the plunger (14), the distal end portion (14b) located in the hollow portion of the bobbin (11) has an outer shape whose outer dimension in the direction orthogonal to the axial direction is larger than that of the intermediate intermediate portion (14a). Having an enlarged portion (14c);
The plunger-type solenoid, wherein the outer enlarged portion (14c) and the bearing (15a) constitute a plunger removal prevention structure that prevents the plunger (14) from coming off from the bobbin (11). The plunger (14) comprises at least a first plunger component (17) and a second plunger component (18);
The first plunger component (17) constitutes the axial intermediate portion (14a),
The plunger-type solenoid according to claim 1, wherein the second plunger component (18) constitutes the tip side portion (14b). A manufacturing method for manufacturing the plunger-type solenoid according to claim 2,
Fit the bearing (15a) on the outer peripheral side of the first plunger component (17),
Then, fixing the second plunger component (18) to the first plunger component (17),
Next, the bobbin (11) around which the coil (10) is wound in advance is put on the outside of the second plunger component (18) and the outside of the bearing (15a),
Next, a method for manufacturing a plunger-type solenoid, wherein the yoke (12) to which the stator core (13) is fixed in advance is placed outside the bobbin (11).

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