JP2020107688A6 - solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily reduce residual magnetism without worrying about wear or cracking of a spacer by not interposing a spacer between a suction portion of a plunger and a fixed iron core and a sliding surface between the plunger.
SOLUTION: A solenoid 10 is provided between a body stepped portion and a guide flange portion 18a in a coil magnetic path 28 at a location other than a sliding surface between a plunger 14 and a suction portion 16a of a fixed iron core 16 and a plunger 14. A magnetic gap orthogonal to the coil magnetic path 28 is formed at a position where the shortest magnetic path can be formed.
[Selection diagram] Fig. 1

Description

The present invention relates to a solenoid, and more particularly to a lock solenoid used in an in-vehicle parking lock device.

In the parking lock device used for automobiles and the like, a magnetic force lock device is used to lock each shift state.

For example, in Patent Document 1, it is a parking lock device mounted on a vehicle and forming a parking lock state and a parking lock release state, and moves back and forth in the first direction to switch between the parking lock state and the parking lock release state. A second moving member having a possible first moving member and a contacting portion provided on the first moving member and capable of contacting the first moving member and moving in an orthogonal direction orthogonal to the first direction. Further provided is a magnetic force locking device capable of locking the second moving member by magnetic force so that the movement of the first moving member is restricted by the contact between the contacted portion and the abutting portion. A parking lock device characterized by the above is shown.

As a magnetic force locking device capable of locking the second moving member, Patent Document 1 discloses a structure using a solenoid. This solenoid has a structure that regulates the movement of the lock shaft (lock member) and plunger to the rear cap side (end plate side) in both the non-excited state and the excited state of the coil in a state where no external force is applied. It has become.

In the case of the solenoid disclosed in Patent Document 1, the time for maintaining the state in which the lock member for restricting the movement of the second moving member is held by a strong force, that is, the state in which the electromagnetic force of the solenoid is generated (excited state). Is long. Then, by releasing the electromagnetic force (non-excited state), the second moving member can be moved. However, when the switching operation is performed from this excited state to the non-excited state, the lock member does not move due to the influence of the residual magnetism generated in the solenoid, which adversely affects the operation such that the parking lock state and the unlocked state cannot be switched. Can be considered.

Here, the spring normally built in the solenoid acts as a return spring in a direction opposite to the suction direction due to the electromagnetic force of the solenoid. Therefore, when the solenoid is changed from the excited state to the non-excited state, the elastic action of the return spring rebounds in the direction of returning the plunger to the original position with a force far larger than the influence of the adsorption holding force by the residual magnetism. Therefore, in a solenoid having a return spring, the influence of residual magnetism is less of a concern. However, since the direction of the elastic force of the solenoid spring disclosed in Patent Document 1 is the same as the direction of the electromagnetic force of the solenoid, the influence of the residual magnetism cannot be ignored, which adversely affects the operation. Cheap.

As a conventional countermeasure against the influence of such residual magnetism, it is generally known that a spacer made of a non-magnetic material is interposed at the tapping position (adsorption portion) of the plunger and the fixed iron core (for example, Patent Document 2). .. With this structure, the influence of residual magnetism can be suppressed.

Special re-publication WO 2015/098969 Akira Jinkai 62-23411

However, the structure in which a non-magnetic material is interposed between the plunger and the suction portion of the fixed iron core shown in Patent Document 2 has a problem that it is easily worn by repeated operation. Further, in the solenoid used for the parking lock device shown in Patent Document 1, if the spacer is damaged due to an increase in residual magnetism due to wear or the like and the fragment is caught in the gap, the parking lock cannot be released. It may directly adversely affect the running operation of the vehicle itself.

The present invention has been made in view of the above problems, and by not passing a spacer between the suction portion of the plunger and the fixed iron core and the sliding surface of the plunger, there is no concern about wear or cracking of the spacer, and the spacer can be easily used. The purpose is to reduce the residual magnetism.

In order to achieve the above object, the solenoid according to the present invention is
A cylindrical body having an opening in the cylindrical axis direction, a fixed iron core arranged at one end of the body, a coil arranged in the body, a guide inserted in the coil, and sliding on the guide. A solenoid equipped with a plunger that can be freely inserted.
In the excited state of the coil, a magnetic path of the coil that circulates between the body, the guide, the plunger, and the fixed iron core is generated.
It is characterized in that a magnetic gap in the axial direction of the coil is provided between the body stepped portion of the body and the guide flange portion of the guide.

According to the solenoid according to the present invention, by providing a magnetic gap between the body and the guide of the solenoid, the influence of residual magnetism can be reduced and the solenoid can be operated even with a simple structure.

It is sectional drawing of the solenoid of 1st Embodiment. It is a perspective view of the non-magnetic material ring of 1st Embodiment. FIG. 3A is an enlarged view of the solenoid of the first embodiment. FIG. 3B is an enlarged view of the solenoids of the second and third embodiments. FIG. 3C is an enlarged view of the conventional structure of the solenoid. It is a graph comparing the conventional structure of a solenoid and the attractive force at the time of residual magnetism in the first to third embodiments. It is a graph comparing the conventional structure of a solenoid and the suction force when the rated voltage is applied in the first to third embodiments.

Hereinafter, the solenoid according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIGS. 1 and 3A, the solenoid 10 of the first embodiment has a coil 13, a plunger 14 and a spring 17 in the body 12. Then, a magnetic path 28 is generated in the plunger 14 in the coil 13 by the excitation of the coil 13. The magnetic path 28 of the coil circulates between the body 12, the guide 18, the plunger 14 and the fixed iron core 16 when the magnetic path 28 is in the excited state of the coil. The direction of the pressing force A due to the electromagnetic force of the magnetic path 28 and the direction of the spring pressing force B are the same, and the plunger 14 has a holding force in the direction of projecting the lock member 11 to the outside via the pin 15. .. The arrows of the pressing force A, the spring pressing force B, and the external force C due to the electromagnetic force in FIG. 1 are image diagrams showing the directions of the forces.

The solenoid 10 press-fits the fixed iron core 16 into the cylindrical body 12 having an opening in the cylindrical axial direction, and further press-fits the press-fit ring 21. The press-fit ring 21 has a flange portion 21a, a gap 27 is formed between the body 12 and the collar portion 21a, and the collar portion 21a seats the coil 13. The press-fitting margin of the press-fitting ring 21 can be finely adjusted, and the position of the coil 13 in the coil axial direction can be adjusted when the press-fitting ring 21 is press-fitted at the same time as the coil 13 is installed. Although the fixed iron core 16 in the present embodiment has a structure of being press-fitted into the body 12, the fixed iron core 16 may be integrated with the body 12.

The solenoid 10 has a guide 18 inserted into the coil 13 via a non-magnetic material ring 20 on a surface opposite to the installation surface of the coil 13 (press-fit ring flange portion 21a), and the guide collar portion 18a and the coil 13 are non-magnetic materials. The ring 20 is sandwiched and fixed.

As shown in FIG. 2, the non-magnetic material ring 20 has a fitting portion 20a and is aligned with the inner cylinder portion of the coil 13 so as to be coaxial with the coil 13. The opening 20b is a hole for the mold resin of the coil 13 used for integrally molding with a stepped hole (not shown) provided in the guide flange portion 18a and a fitting portion (not shown) formed in the coil 13. In the present embodiment, the coil 13, the non-magnetic ring 20, and the guide 18 are integrally molded and fixed by a mold resin, but they do not have to be integrally molded. In that case, the opening 20b is not provided. You may.

As shown in FIG. 1, a plunger 14 is slidably fitted on the inner diameter side of the guide 18, and a pressing force A due to an electromagnetic force is provided in the plunger 14 by a magnetic path 28 generated by excitation of a coil 13. The direction of the force is generated, and the plunger 14 is attracted to the suction portion 16a of the fixed iron core 16. A pin 15 is press-fitted into the plunger 14 to support the lock member 11 via the pin 15. A breathing hole 24 is formed in the pin 15 and the plunger 14 so that the plunger 14 can easily move in the coil axial direction.

The lock member 11 is inserted into the sleeve 25 via a bearing 23, and the sleeve 25 is fixed by caulking the body 12. Further, in the operating range of the lock member 11, the bearing 23 and the stop member 26 regulate the movement and rotation direction of the lock member 11 in the coil axial direction.

A spring 17 is interposed on the surface of the plunger 14 in the direction opposite to the press-fitting side surface of the pin 15, the spring 17 is held by the spring holding portion 22a of the end plate 22, and the spring pressing force is generated by the elastic force of the spring 17. B is generated.

The end plate 22 is caulked and fixed to the body 12. Further, the plate 19, the guide 18, the non-magnetic ring 20 and the coil 13 are pressed in the direction of the press-fit ring flange 21a by the spring portion 22b having the spring property of the end plate 22 to fix the coil axial direction. ing. In the first embodiment, the plate 19 is interposed between the guide collar portion 18a and the end plate 22, but the guide collar portion 18a and the plate 19 may be integrated.

<Second embodiment>
Next, the solenoid according to the second embodiment of the present invention will be described. The solenoid according to the present embodiment has the structure shown in FIG. 3B, and is related to the first embodiment in that an air gap G is formed between the body stepped portion 12a and the guide collar portion 18a. It is different from the solenoid 10. Further, the non-magnetic ring 20 is shorter than the inner diameter of the body stepped portion 12a. Further, the non-magnetic material ring 20 is arranged at a position where the shortest distance between the radial end portion of the non-magnetic material ring 20 and the body stepped portion 12a is at least the air gap G and away from the body stepped portion 12a. There is. The configuration of the solenoid 10 of the other second embodiment is the same as that of the solenoid 10 of the first embodiment.

<Third embodiment>
Next, the solenoid according to the third embodiment of the present invention will be described. Although the solenoid according to this embodiment has the structure shown in FIG. 3B, it is a modified example of the second embodiment, and the solenoid has a magnetic spacer 30 instead of the non-magnetic spacer 20 of the second embodiment. This is different from the solenoid 10 according to the second embodiment. Then, as in the second embodiment, an air gap G is formed between the body stepped portion 12a and the guide flange portion 18a. Further, the magnetic ring 30 is shorter than the inner diameter of the body stepped portion 12a. Further, the magnetic ring 30 is arranged at a position where the shortest distance between the radial end of the magnetic ring 30 and the body stepped portion 12a is greater than or equal to the air gap G and away from the body stepped portion 12a. By arranging in this way, the structure is such that the distance between the body stepped portion 12a and the magnetic material ring 30 is not the shortest distance of the magnetic path 28. The configuration of the solenoid 10 of the other third embodiment is the same as that of the solenoid 10 of the first and second embodiments.

The solenoid 10 according to the first to third embodiments is configured as described above, and the operation and its action and effect will be described next.

The solenoid 10 maintains the state shown in FIG. 1 when no external force C is applied in both the non-excited state and the excited state of the coil 13. A force is applied to the solenoid 10 in the excited state in a direction in which the lock member 11 is pushed out (locked) by the resultant force of the pressing force A and the spring pressing force B due to the electromagnetic force. Since the solenoid 10 in the non-excited state receives only the spring pressing force B, the locking member 11 can be moved in the pushing (unlocking) direction only by the external force C larger than the spring pressing force B. With this structure, the solenoid 10 can adjust the attractive force by excitation and control the operation of the lock member 11 having a plurality of patterns by the magnitude of the non-excited and external force C.

In the present invention, the shortest distance between the body stepped portion 12a and the guide flange portion 18a in the coil magnetic path 28 and at a location other than the sliding surface between the plunger 12 and the suction portion 16a of the fixed iron core 16 and the plunger 14. A magnetic gap G orthogonal to the coil magnetic path 28 is formed at a position where the magnetic path of the above can be formed. The magnetic gap G reduces the influence of the residual magnetism when switching from the excited state to the non-excited state, so that the plunger 14 can be operated quickly. Further, the means for forming the magnetic gap G can obtain the same effect not only when the magnetic gap G is formed by the non-magnetic material ring 20 but also when the magnetic gap G is formed by the air gap G. Needless to say, when the magnetic gap G is provided at a position where the coil magnetic path 28 is not formed, the effect of the present invention cannot be obtained.

By adjusting the size of the gap of the magnetic gap G, it is also possible to adjust the magnetic resistance and finely adjust the attractive force. It is desirable that the gap is formed so as to have a thickness of 0.05 mm to 0.3 mm in the coil axial direction.

FIG. 4 is an evaluation of the influence of the inventor on the residual magnetism by providing the magnetic gap G of the patented structure. The conventional structure in the graph is the conventional structure of FIG. 3 (C), FIG. 3 (I) is the first embodiment (gap G by the non-magnetic ring 20) of FIG. 3 (a), and FIG. The second embodiment (non-magnetic ring 20 and air gap G) in the shape of b), (III) of the third embodiment (magnetic ring 30 and air gap G) in the shape of FIG. 3 (b). Represents each of the solenoids 10. This evaluation is a comparison of the holding forces generated in the plunger 14 and the suction portion 16a in a state where a minimum voltage is applied assuming residual magnetism. The smaller the holding force due to the residual magnetism, the better, and by forming the magnetic gap G, the influence of the residual magnetism is reduced by about 40% in all of (I), (II), and (III) with respect to the conventional structure, and improvement is made. I was able to plan.

Further, FIG. 5 compares the holding forces of the plunger 14 and the suction portion 16a with the rated voltage applied. The target structure of the solenoid 10 to be evaluated is the same as that in FIG. In this evaluation, it is evaluated to confirm that the holding force of the solenoid 10 does not change in the original use state by providing the magnetic gap G. From this result, it can be seen that all of (I), (II), and (III) have almost the same holding power with respect to the conventional structure, and do not have a corresponding effect even in the actual usage state. ..

In the solenoid 10 of the first to third embodiments, the guide 18 and the guide flange portion 18a are integrally molded, but a structure may be formed in which the magnetic path 28 of the coil is formed separately.

Further, in the solenoid 10 of the third embodiment, the magnetic material ring 30 and the guide collar portion 18a are separate bodies, but the magnetic material ring 30 and the guide collar portion 18a are integrally molded, and the body stepped portion 12a and the guide are guided. It may have a guide shape in which an air gap G is formed at a position where the shortest magnetic path 28 with the flange portion 18a can be formed (for example, a groove or a stepped portion is formed in the guide flange portion to form a groove portion or a groove portion or a stepped portion. An air gap G is formed at the stepped portion). Further, in forming the air gap G, it is also possible to facilitate the formation of the air gap G by providing an engaging portion between the body 12 and the coil 13 or between the body 12 and the guide flange portion 18a.

All the solenoids 10 of the first to third embodiments are oriented in the direction in which the pressing force B of the spring 10 is locked. However, according to the present invention, even in a structure having a return spring in the unlocking direction instead of the spring 10 or a structure without the spring 10, the magnetic gap G between the body stepped portion 12a and the guide flange portion 18a of the present invention The configuration can have the effect of reducing the influence of residual magnetism.

Although the embodiment for carrying out the present invention has been described above with reference to examples, the present invention is not limited to the structure of the examples, and the seed owner is used as long as the gist of the present invention is not deviated. It goes without saying that it can be carried out in shape. Further, it goes without saying that the application of the present invention is not limited to the lock solenoid used in the parking lock device, and can be used in various applications such as a solenoid valve and a lock solenoid in other devices.

10 Solenoid 11 Lock member 12 Body 12a Body stepped part 13 Coil 14 Plunger 15 Pin 16 Fixed iron core 16a Suction part 17 Spring 18 Guide 18a Guide flange part 19 Plate 20 Non-magnetic material ring 20a Fitting part 20b Opening 21 Press-fit ring 21a Press-fit ring flange 22 End plate 22a Spring holding 22b Spring 23 Bearing 24 Breathing hole 25 Sleeve 26 Stopping member 27 Space 28 Coil magnetic path 30 Magnetic ring A Electromagnetic pressing force B Spring pressing force C External force G Magnetic gap

Claims (5)

A cylindrical body having an opening in the cylindrical axis direction, a fixed iron core arranged at one end of the body, a coil arranged in the body, a guide inserted in the coil, and sliding on the guide. A solenoid equipped with a plunger that can be freely inserted.
In the excited state of the coil, a magnetic path of the coil that circulates between the body, the guide, the plunger, and the fixed iron core is generated.
A solenoid characterized by providing an axial magnetic gap of the coil between the body stepped portion of the body and the guide flange portion of the guide. It has a spring that brings the plunger into close contact with the fixed iron core.
The solenoid according to claim 1, wherein the elastic direction of the spring and the pressing direction of the plunger by the excitation of the coil via the magnetic path are the same. The solenoid according to claim 1 or 2, wherein the magnetic gap is formed at a position where the distance of the magnetic path is the shortest between the body stepped portion and the guide collar portion. The solenoid according to claim 1 to 3, wherein the magnetic gap is an air gap. The solenoid according to claim 1 to 3, wherein the magnetic gap is a non-magnetic material.

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