JPH055830Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] <Industrial application field> The invention uses a polymer material placed between the movable member and the fixed member to cushion the impact when the movable member hits the fixed member. The present invention relates to a formed shock absorbing member, and particularly relates to a shock absorbing member suitable for an actuator using a solenoid, a motor, a spring means, or the like.

<Prior Art> Generally, various shock absorbing members are used to eliminate the damage and knocking noise that occurs between moving members when they are stopped by a stopper. For example, the shift lock device of an automobile's automatic transmission uses an electromagnetic actuator as a release means, but when the actuating rod hits the stopper surface due to attraction by the solenoid, the driver hears a loud banging sound. A problem arises in that it causes discomfort. Conventionally, various buffer structures or members have been used in such electromagnetic actuators to prevent or reduce hitting noise. For example, Utsukai Showa 60-65486
In the publication, elastic sheets are attached to both the front and rear ends of the plunger that collides with the stopper surface to absorb the collision energy. In addition, in the electromagnetic actuator disclosed in Utility Model Application Publications No. 61-47168 and No. 62-112372, a movable core in the shape of a cylinder with a bottom is disposed so as to be movable within the center hole of a bobbin around which a solenoid is wound, and the fixed core A spacer is arranged at a portion that comes into contact with.

However, such a conventional shock absorbing structure requires a separate shock absorbing member for each of the stopper surfaces provided in both directions along the moving direction of the movable plunger. For this reason, the number of parts increases, and the directionality must be taken into account when assembling them, which is troublesome. Furthermore, since the surface of the buffer member that comes into contact with the stopper surface is flat, the contact area between them becomes large and the buffer member tends to stick to the stopper surface, which requires extra force when driving the movable plunger. , there was a risk that the operation of the electromagnetic actuator would be hindered.

<Problem that the invention aims to solve> Therefore, the purpose of this invention is to reduce the number of parts,
Another object of the present invention is to provide a buffer member that is easy to assemble and can effectively prevent sticking to a stopper surface, and is particularly suitable for electromagnetic actuators and the like.

[Structure of the invention] <Means for solving the problem> According to the present invention, the above-mentioned object is to reduce the impact when two relatively movable members are brought into contact with each other at two limit positions. The buffer structure is integrally molded in a ring shape to be attached to a flange extending from one of the members in a direction perpendicular to the direction of movement thereof, and the front and rear surfaces of the flange extend along the direction of movement. This is achieved by providing a buffer member characterized in that it has portions each protruding from the buffer member.

<Function> In this way, it is possible to reduce the impact on both the front and rear sides of the flange that is hit by the stopper surface of the other member when the two members reciprocate relative to each other.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

FIG. 1 shows an embodiment of an electromagnetic actuator to which the present invention is applied, which is used as a release means for a shift lock device of an automatic transmission for a vehicle. This electromagnetic actuator 1 has a bottomed cylindrical housing 2 with one end 2a open, a step 3 provided on the other end 2b, and a hole 4 penetrating through the center of the bottom. A set plate 5 is coupled to the open end 2a of the housing 2 so as to close the inside of the housing 2 by caulking its thin wall.

Inside the housing 2, there is a resin bobbin 6 having flanges at both left and right ends, and an elastic sheet 8 is attached to an end plate 7 whose one end is supported by the stepped portion 3.
The set plate 5 is placed in contact with the set plate 5 at the other end thereof, and is sandwiched by the set plate 5 at the other end. A solenoid 9 is wound around the bobbin 6, and a lead wire 11 from the outside supported by a stay 10 is connected to the solenoid to a terminal 12.

A guide collar 14 is tightly attached to the inner surface of a hole 13 passing through the center of the bobbin 6.
Further, inside the guide collar 14, a fixed core 15 whose one end is fixed to the set plate 5 and a plunger 16 which is slidable along the axial direction are fitted. An O-ring 17 is fitted around the outer periphery of the fixed core 15 to seal the gap between the guide collar 14 and the fixed core 15. The plunger 16 is integrally formed by a crepis 18 projecting outward from the hole 4 of the housing end 2b, a protrusion 20 fitted into the recess 19, and a spring pin 21 inserted in the orthogonal direction. connected. Crepis 1
A through hole 23 is provided in the protruding end 22 of 8, and is connected to a release lever of a shift lock device (not shown).

A flange-shaped stopper 24 is provided around the outer peripheral surface of the crepis 18 located inside the housing 2. A ring-shaped buffer member 25, which will be described later, is attached to the outer periphery of the stopper 24. When the plunger 16 slides in both directions along the axial direction,
The stopper 24 touches the bottom surface 26 of the movable housing 2 or the end surface 7a of the end plate 7 on both its left and right sides.
, and the movement of the plunger 16 is restricted within this range. That is, the distance between the bottom surface 26 and the end surface 7a determines the stroke of the plunger 16. The buffer member 25 absorbs the impact when the stopper 24 hits the bottom surface 26 or the end surface 7a serving as the stopper surface, prevents or reduces the impact sound, and prevents damage to both the stopper 24 and the stopper surface.

As clearly shown in FIG. 2, the buffer member 25 of this embodiment is bilaterally symmetrical and consists of circular parts 25a, 25b arranged on both sides of the stopper 24 and a thin part 25c connecting them in the installed state. It has a cross-sectional shape and is integrally molded from a polymer material such as synthetic rubber. Further, the inner diameter of the buffer member 25 is smaller than the outer diameter of the stopper 24 but larger than the outer diameter of the clevis 18. Therefore, the buffer member 25 always contacts each stopper surface with a convex curved surface, and since the contact area is small, sticking to the stopper surface is prevented.
In addition, since it is symmetrical, it can be easily assembled without having to consider the directionality during installation, and can be held in a predetermined position on the stopper 24 by the elastic force of the material.

At the end of the plunger 16 facing the fixed core 15, a fixed core tip 27 is formed to be tapered.
A tapered hole 28 having a shape that complements the above is bored, and when the plunger 16 moves toward the fixed core 15, the tip end 27 fits into the tapered hole 28. Recesses 29 and 30 are formed in the bottom of the tip portion 27 and the tapered hole 28, respectively, and a return spring 31 received therein urges the plunger 16 away from the fixed core 15. The plunger 16 also has a flat part 32 extending along the axial direction from the end on the fixed core 15 side and having a predetermined length in parallel to the outer peripheral surface of the plunger 16.
However, the other cylinder part 33 and guide collar 14
It is formed to ensure an appropriate length of overlap between the two.

When the solenoid 9 is off, the plunger 16 is separated from the fixed core 15 by the biasing force of the return spring 31, as shown by the solid line in FIG. 26. When the solenoid 9 is turned on, the plunger 16 is attracted by the solenoid 9 and comes closest to the fixed core 15, as shown by the imaginary line in FIG. It is locked via 25b.

Further, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications and changes. For example, the stopper for mounting the buffer member may be provided on the fixed housing side rather than on the reciprocating plunger side, and may have an inward flange instead of an outward flange. Furthermore, the present invention can be applied not only to the electromagnetic actuator described above but also to various actuators or devices.

[Effects of the invention] As described above, according to the invention, the convex curved surface is integrally molded from a polymer material so as to have a symmetrical cross-sectional shape in the moving direction of the plunger, and faces each of the stopper surfaces. By being attached to the outer periphery of the stopper so as to protrude from both the front and rear sides of the stopper, the number of parts can be reduced, the left and right directionality can be eliminated, and ease of assembly can be improved. Furthermore,
Since the contact area between the buffer member and the stopper surface is reduced and sticking to the stopper surface is prevented, the plunger can be driven more smoothly and operated more reliably, especially when used in an electromagnetic actuator.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the entire electromagnetic actuator to which the present invention is applied. FIG. 2 is a partially enlarged view showing the mounting state of the buffer member according to the present invention. 2...Housing, 7...End plate, 7
a... End face, 16... Plunger, 18... Clevis, 24... Stopper, 25... Buffer member, 2
6...Bottom surface.

Claims (1)

[Claims for Utility Model Registration] (1) In a buffer structure for alleviating the impact when two members that are relatively reciprocally movable are brought into contact with each other at two limit positions, one of the members A buffer member that is integrally molded in a ring shape so as to be attached to a flange extending from the member in a direction perpendicular to the direction of movement thereof, and has portions that respectively protrude from the front and rear surfaces of the flange along the direction of movement. . (2) The cushioning member according to claim 1, wherein the portion has a convex curved surface facing the blocking surface of the other member.