JPH0645181U - Striking reduction structure of electromagnetic actuator - Google Patents

Abstract

(57) [Abstract] [Purpose] A simple structure is used to reduce the tapping sound generated when the plunger is attracted. A solenoid 35 is provided with a plunger 35b capable of advancing and retracting with respect to the solenoid body 35a, and an electromagnetic actuator that attracts the plunger 35b to the solenoid body 35a by exciting the solenoid body 35a.
A shock absorbing means for fixing the cover member 41 to 5a, providing a connecting member 43 made of resin on the plunger 35b, and abutting the cover member 41 on the connecting member 43 immediately before the plunger 35b is attracted to the solenoid main body 35a and elastically deforming. 47 is molded integrally.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic actuator that uses an electromagnetic attraction force, and particularly to a structure of an electromagnetic actuator that can reduce a tapping sound when a plunger is attracted.

[0002]

[Prior art]

 A vehicle equipped with an automatic transmission (hereinafter referred to as an AT vehicle) is equipped with a technique for preventing erroneous operation. A shift lock mechanism is known as one of the techniques. The shift lock mechanism prevents the shift operation from the P (parking) position unless the brake pedal is pressed when starting, which prevents the brake pedal and accelerator pedal from being pressed differently. This shift lock mechanism is provided with a solenoid (electromagnetic actuator) that operates by an electric signal, and the shift lock is released when the solenoid is excited.

FIG. 9 shows an example of a conventional shift lock releasing device. In the figure, 1 indicates a shift lever, and 3 indicates a detent pin movably attached to the shift lever 1. The detinto pin 3 is adapted to interlock with the movement of a push button (not shown) located on the top of the shift lever 1. The detinting pin 3 is engageable with each positioning portion 4a of the detinting plate 4. A shift lock plate 5 is arranged near the detinting plate 4. The shift lock plate 5 is held by the detint plate 4 so as to be vertically movable. When the shift lever 1 is in the stop position (parking position), the detinto pin 3 engages with the shift lock plate 5.

A swingable lock lever 6 is arranged near the shift lock plate 5. The upper end surface 6a of the lock lever 6 can come into contact with the locking end surface 5a of the shift lock plate 5. A solenoid (electromagnetic actuator) 7 is connected to the lock lever 6. When the solenoid 7 is not excited, the lock lever 6 swings toward the shift lock plate 5 side by the spring force of the compression spring 8. A position detection switch 9 for detecting the vertical displacement of the shift lock plate 5 is provided near the shift lock plate 5.

In the shift lock releasing device configured as described above, when the brake pedal is depressed while the shift lever 1 is in the stop position when the vehicle starts, the solenoid 7 is excited and the solenoid 7 is excited as shown in FIG. Further, the lock lever 6 is swung in the direction away from the shift lock plate 5 by the attraction force of the solenoid 7. Therefore, the shift lock plate 5 and the lock lever 6 can come into contact with each other, and the movement of the shift lock plate 5 is not restricted by the lock lever 6. Therefore, the detint pin 3 that engages with the shift lock plate 5 can be pushed down, and the shift lever 1 can be moved to another position.

In this way, when the vehicle starts, the solenoid 7 is excited under a certain condition and the shift lock of the shift lever 1 is released, so that an erroneous shift operation can be reliably prevented. As prior arts relating to the shift lock releasing device, for example, Japanese Utility Model Laid-Open No. 64-55128, Japanese Utility Model Laid-Open No. 1-174227, Japanese Utility Model Laid-Open No. 2-87619 and the like are known.

However, the conventional shift lock releasing device shown in FIG. 9 has the following problems. This will be described below. As shown in FIG. 10, the solenoid 7, which is an electromagnetic actuator, has a solenoid body 7a and a plunger 7b, and the plunger 7b is attracted to the solenoid body 7a when the solenoid body 7a is excited. When the plunger 7b is attracted to the solenoid body 7a, a striking sound is generated due to the collision between the plunger 7b and the solenoid body 7a.

Since the shift lock releasing operation is performed immediately before the vehicle starts moving, a striking sound when the plunger 7b is attracted to the solenoid body 7a is noticeable, which gives an occupant a discomfort. Therefore, a solenoid (electromagnetic actuator) 7 having a structure as shown in FIG. 11 is used.

In FIG. 11, a plate member 11 is fixed to a connecting member 7c attached to one side of a plunger 7b of a solenoid 7, and an elastic member 12 made of sponge rubber or the like is attached to the plate member 11. It is joined. A cover member 13 that covers the solenoid body 7a is fixed to the solenoid body 7a of the solenoid 7.

In the solenoid 7 configured as described above, when the plunger 7b is attracted to the solenoid body 7a, the elastic member 12 comes into contact with the cover member 13 in advance as shown in FIG. Due to the elastic deformation of the elastic member 12 at this time, the impact at the time of hitting the solenoid main body 7a of the plunger 7b is mitigated, and the tapping sound is reduced.

[0011]

[Problems to be solved by the device]

 However, the solenoid shown in FIG. 11 still has a problem to be solved. In the case of the solenoid 7 of FIG. 11, it is necessary to fix the plate member 11 to the connecting member 7c attached to the plunger 7b, and further to attach the elastic member 12 to the plate member 11, so the number of parts to be assembled However, there is a problem that the number of man-hours for assembling also increases as the number of workers increases.

The tapping sound generated when the plunger is attracted to the solenoid is not limited to the shift lock release device of the automobile, but is a problem that can be commonly applied to the device using the electromagnetic actuator.

The present invention focuses on the above problems, and an object thereof is to provide a striking sound reduction structure of an electromagnetic actuator capable of reducing the striking sound generated when the plunger is attracted by a simple structure.

[0014]

[Means for Solving the Problems]

 To achieve this object, the striking noise reducing structure of an electromagnetic actuator according to the present invention is an electromagnetic actuator in which a plunger is provided so as to be able to move forward and backward with respect to a solenoid body and the plunger is attracted to the solenoid body by exciting the solenoid body. At this point, a cover member is fixed to the solenoid body, and a resin connecting member is provided on the plunger, and the connecting member comes into contact with the cover member immediately before the plunger is attracted to the solenoid body, and is elastically deformed. The absorbing means is integrally formed.

[0015]

[Action]

 In the striking noise reduction structure of the electromagnetic actuator configured as described above, since the elastically deformable shock absorbing means is integrally formed with the resin-made connecting member attached to the plunger, the plate-like structure conventionally used. Members and elastic members such as sponge rubber are unnecessary. Therefore, it is possible to reduce the tapping sound at the time of attracting the plunger without complicating the structure of the electromagnetic actuator.

[0016]

【Example】

 Hereinafter, a preferred embodiment of a striking sound reducing structure for an electromagnetic actuator according to the present invention will be described with reference to the drawings. 1 to 8 show one embodiment of the present invention, particularly when applied to a shift lock releasing device of a shift lever of an automobile.

In FIG. 5, reference numeral 21 indicates a base body made of a thermoplastic resin. The base body 21 is formed with a detinting plate 22 having a detinting portion 22a and a shift lever plate 23 having a detinting portion 23a. The detinting plate 22 and the shift lever plate 23 are covered by a housing 24. The housing 24 has an indicator 26 that displays the shift position of the shift lever 25. The lower end of the shift lever 25 is swingably connected to the lower portions of the detint plate 22 and the shift lever plate 23 via a fulcrum shaft 27.

Inside the shift lever 25, a rod 30 extending in the axial direction is provided. A knob 25a located at the top of the shift lever 25 is provided with a push button 31 which can be moved in and out in the horizontal direction. One end of the push button 31 comes into contact with an inclined surface of an inclined knob 30a provided on the upper end of the rod 30. At the lower end of the rod 30, a detent rod portion 30b is provided. The rod 30 and the detinting rod portion 30b are connected by screwing.

A detinting pin 32 is inserted into the detinting rod portion 30b connected to the rod 30 so as to be freely inserted and removed. The detinting pin 32 is arranged in a direction orthogonal to the axial direction of the rod 30. The detint plate 22 and the shift lever plate 23 are formed on the base member 21. The detint plate 22 is formed with a detint portion 22a to which one of the detint pins 32 can be engaged. The shift lever plate 23 is formed with a detint portion 23a with which the other end of the detint pin 32 can be engaged. Each detinting portion 22a, 23a has a plurality of engaging steps for positioning the shift lever 25 at each position.

The detint portion 22a formed on the detint plate 22 and the detint portion 23a formed on the shift lever plate 23 are formed in the same shape, and the detint pin 32 has each detint portion 32a. , 23a at the same time.

As shown in FIG. 4, a shift lock plate 33 is provided substantially in the center of the detint plate 22. The shift lock plate 33 is held by the detent plate 22 so as to be vertically movable. An engagement groove 33a is formed on the back surface of the shift lock plate 33. When the shift lever 25 is located at the stop position (parking position), the detinting pin 32 engages with the engagement groove 33a of the shift lock plate 33.

A lock lever 34 is provided near the shift lock plate 33. The lock lever 34 is swingable around the support shaft 29, and the upper end surface 34b is capable of contacting the locking end surface 33c of the shift lock plate 33. An electromagnetic actuator (solenoid) 35 is connected to the lock lever 34. The electromagnetic actuator 35 has a solenoid main body 35a in which a coil is wound around an iron core, and a plunger 35b capable of moving forward and backward with respect to the solenoid main body 35a.

The solenoid body 35a is fixed to the detint plate 22 side. A compression coil spring 36 for urging the lock lever 34 toward the shift lock plate 33 is arranged on the outer periphery of the plunger 35b of the electromagnetic actuator 35. When the solenoid body 35a is excited, the plunger 35b is attracted to the solenoid body 35a side, and the lock lever 34 swings away from the shift lock plate 33. When the solenoid body 35a is not excited, the lock lever 34 is returned to the shift lock plate 33 side by the spring force of the compression coil spring 36.

A box-shaped cover member 41 that covers the solenoid body 35 a is fixed to the solenoid body 35 a with machine screws 40. The cover member 41 is made of synthetic resin. A resin connecting member 43 is attached to one of the plungers 35b of the electromagnetic actuator 35. The connecting member 43 is fixed to the plunger 35b via the spring pin 42.

The connection member 43 is formed with a connection hole 45 into which a connection pin 44 for connection with the lock lever 34 is inserted. Pressure receiving portions 46 extending outward along the front end face 41a of the cover member 41 are integrally formed with the connecting member 43 above and below the end of the connecting member 43 on the solenoid body 35a side. Each of the pressure receiving portions 46 is formed with two impact absorbing means 47 that abut the front end surface 41a of the cover member 41 and elastically deform immediately before the plunger 35b is attracted to the solenoid body 35a. Each shock absorbing means 47 is formed integrally with the connecting member 43.

When the solenoid body 35a is not excited, the distance between the attraction surface of the solenoid body 35a and the attraction surface of the plunger 35b is S ₁ . In this state, the distance between the tip of the impact absorbing means 47 and the front end face 41a of the cover member 41 is S ₂ . The distance S ₂ is set to be smaller than the distance S ₁ , and the impact absorbing means 47 is surely elastically deformed by the contact with the cover member 41 when the plunger 35b is completely attracted to the solenoid body 35a. It has become.

As shown in FIG. 6, the shock absorbing means 47 is formed in a U-shaped protrusion that protrudes toward the front end face 41 a of the cover member 41, and has a wall thickness significantly larger than that of the pressure receiving portion 46. It is getting thinner. Since the shock absorbing means 47 is thin in this way, it can be easily elastically deformed by an external force, and the shock force when the plunger 35b is attracted to the solenoid body 35a can be mitigated.

The shape of the shock absorbing means 47 shown in FIG. 6 is an example, and the shape is not limited to this, and the shock absorbing means 47 has a U-shaped configuration like the shock absorbing means 51 shown in FIG. Alternatively, the shock absorbing means 52 shown in FIG. 8 may be configured such that the whole is U-shaped and only the tip is U-shaped.

Next, the operation of this embodiment will be described. Vehicles equipped with an automatic transmission are equipped with technology to prevent erroneous operation, so that the driver cannot shift from the P position (parking position) unless the brake pedal is pressed when starting. As shown in FIG. 4, when the shift lever 25 is in the parking position, the detinting pin 32 is engaged with the engaging groove 33 a of the shift lock plate 33.

When the starting condition of the vehicle is not satisfied (when the brake pedal is not depressed) and the solenoid main body 35a is not excited, the lock lever 34 is returned to the shift lock plate 33 side by the spring force of the compression coil spring 36. Therefore, the shift lock plate 33 and the lock lever 34 are in a state capable of contacting each other. Therefore, even if the push button 31 of FIG. 5 is pressed, the shift lock plate 33 that engages with the detint pin 32 cannot be pushed down more than a predetermined amount, and the shift operation of the shift lever 25 cannot be performed.

When the driver depresses the brake pedal, the vehicle start condition is satisfied, and the solenoid main body 35a is excited. As a result, the lock lever 34 moves in the direction away from the shift lock plate 33, and the restraint of the shift lock plate 33 by the lock lever 34 is released. Therefore, it is possible to push down the shift lock plate 33 that engages with the detent pin 32 by pushing the push button 31, and the shift lever 25 can be shifted.

When the shift lock is released by exciting the solenoid body 35a, the electromagnetic attraction force causes the plunger 35b to be attracted to the solenoid body 35a, but before the plunger 35b is attracted to the solenoid body 35a. In addition, since the shock absorbing means 47 contacts the front end surface 41a of the cover member 41, the elastic deformation of the shock absorbing means 47 absorbs the shock at the time of suction and the tapping sound is reduced.

Further, since the shock absorbing means 47 is formed integrally with the resin connecting member 43 attached to the plunger 35b, the elastic member such as a plate member or sponge rubber which has been conventionally used becomes unnecessary, It is possible to reduce the tapping sound at the time of sucking the plunger 35b without complicating the structure.

In this embodiment, the case where the invention is applied to the shift lock releasing device of the automobile has been described, but the reduction of the hitting sound is also a problem common to the devices using the electromagnetic actuator, and is not limited to this. .

[0035]

[Effect of device]

 According to the present invention, the following effects can be obtained.

(1) A cover member is fixed to the solenoid body, and a resin-made connecting member is provided on the plunger, and the connecting member absorbs the impact of elastic deformation due to contact with the cover member immediately before the plunger is attracted to the solenoid body. Since the means is integrally formed, the striking sound at the time of attracting the plunger can be reduced without complicating the structure of the electromagnetic actuator.

(2) When the electromagnetic actuator according to the present invention is applied to, for example, a shift lock releasing device for an automobile, the tapping sound generated by the shift lock releasing operation at the time of starting the vehicle can be reduced, and the passenger's discomfort is eliminated. can do.

(3) Since the impact of the plunger is absorbed by the elastic deformation of the impact absorbing means, the attraction surface is less damaged by the impact even after long-term use, and the durability of the electromagnetic actuator is improved. You can

[Brief description of drawings]

FIG. 1 is a front view showing a non-excited state of an electromagnetic actuator according to an embodiment of the present invention.

FIG. 2 is a front view showing an excited state of the electromagnetic actuator of FIG.

FIG. 3 is a perspective view of FIG. 2.

FIG. 4 is a front view of a shift lock release device for an automobile using the electromagnetic actuator of FIG.

5 is a sectional view of a shift lever device of an automatic transmission equipped with the shift lock release device of FIG.

6 is a partially enlarged front view of the impact absorbing means of FIG.

7 is a partially enlarged front view showing a modified example of the shock absorbing means of FIG.

8 is a partially enlarged front view showing another modified example of the shock absorbing means of FIG.

FIG. 9 is a front view of a shift lock release device for a vehicle using a conventional electromagnetic actuator.

10 is a front view showing an excited state of the electromagnetic actuator of FIG. 9. FIG.

FIG. 11 is a front view showing a non-excited state of a conventional electromagnetic actuator having a cushioning member attached thereto.

FIG. 12 is a front view showing an excited state of the electromagnetic actuator of FIG.

[Explanation of symbols]

 35 Electromagnetic Actuator 35a Solenoid Main Body 35b Plunger 41 Cover Member 43 Connecting Member 47 Impact Absorbing Means 51 Impact Absorbing Means 52 Impact Absorbing Means

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic actuator in which a plunger is provided so as to be movable back and forth with respect to a solenoid body, and the solenoid body is excited to attract the plunger to the solenoid body. A cover member is fixed to the solenoid body, and the plunger is made of resin. Impact reducing means for integrally elastically deforming the cover member by contacting the cover member immediately before the plunger is attracted to the solenoid body. Construction.