JPH0723635Y2 - Shock absorber removal prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a technology for preventing a cushioning body, in which an elastic member is interposed between an inner cylinder and an outer cylinder, from coming off from a holder member.

[Prior Art] In various parts of an automobile, such as an insulator part and a suspension part, a cushioning member in which an elastic member is interposed between an inner cylinder and an outer cylinder is used as a connecting member having a cushioning property. Conventionally, such a cushioning body is divided into an inner cylinder 1 made of a cylindrical body and a slit portion 2 extending in a direction along the axis and having an outer end formed in a flange shape 3a as shown in FIG. 7, for example. It is composed of a cylinder 3 and an elastic member 4 such as rubber interposed between the inner cylinder 1 and the outer cylinder 3. As shown in FIG. 8, the shock absorber 5 is press-fitted and mounted so that the outer peripheral surface of the outer cylinder 3 is fitted into the inner peripheral surface of the mounting hole of the holder member (for example, suspension member) 6. The shaft 7 side inserted through the inner cylinder 1 is elastically supported by the elastic member 4 with respect to the holder member 6 side, so that a cushioning effect is obtained.

In the above-mentioned structure, in order to maintain a predetermined connection structure between the shaft 7 side and the holder member 6 side, it is necessary to prevent the outer cylinder 3 from coming off the holder member 6 in the axial direction. As a method for preventing this slip-off, a method of welding 8 the holder member 6 and the flange portion 3a of the outer cylinder 3 as shown in the right half of FIG. 8 and the flange portion 3a as shown in the left half of FIG.
Can be fixed to the holder member 6 with bolts and nuts 9.

Further, as disclosed in Japanese Utility Model Publication No. 54-24234, there is also known a method in which an elastic member (rubber) or a metal fitting spacer is inserted in the slit portion of the outer cylinder and the pull-out preventing load is increased by the compression reaction force thereof. ing.

Further, a method is also known in which both the holder member and the outer cylinder are provided with concaves and convexes that engage with each other, and the two are meshed with each other to prevent removal (Japanese Utility Model Publication No. 56-168403).

[Problems to be Solved by the Invention] However, the above conventional method has the following problems.

First, in the method of fixing by welding shown in FIG. 8, the number of steps is increased and dedicated equipment is required, and in the method of fixing with bolts and nuts, the number of steps is increased and the number of pre-processes is increased, resulting in cost increase. There is a problem of inviting.

Further, in the structure disclosed in Japanese Utility Model Publication No. 54-24234, the compression reaction force of the elastic member interposed in the slit changes due to the dimensional tolerance of the mounting hole side of the holder, etc., and stable removal prevention performance is obtained. There are problems such as being hard to be caught.

Further, the method disclosed in Japanese Utility Model Laid-Open No. 56-168403 requires a slight increase in cost because both the holder member and the outer cylinder need to be machined, and positioning accuracy is required to engage the unevenness of both. , Etc.

Further, as a problem common to the above-described conventional structures, since the end face of the outer cylinder on the side opposite to the flange is exposed to the outside (see FIG. 8), when rust occurs on the outer cylinder, the end surface portion of the outer cylinder is There is also a problem that the elastic member bonded to the outer cylinder is easily peeled off.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a simple structure, reliably and at low cost, prevents the buffer from coming off, and prevents the elastic member from peeling off from the end face of the outer cylinder. It is an object of the present invention to provide a slip-out prevention device that can be used.

[Means for Solving the Problems] In order to achieve this object, a device for preventing the shock absorber from falling out according to the present invention is divided into an inner cylinder and a slit portion extending in a direction along an axis, and an outer end formed into a flange shape. In a shock absorber in which the outer cylinder of the outer cylinder is fitted to the inner peripheral surface of the mounting hole of the holder member, the inner peripheral surface and the outer peripheral surface of the end of the outer cylinder opposite to the flange are connected. Is covered by the wraparound portion of the elastic member, and the wraparound portion of the elastic member is elastically deformed inward in the radial direction when the outer cylinder is inserted into the mounting hole of the holder member, and the flange portion of the outer cylinder is attached to one end surface of the holder member. When it is engaged with, it is formed into a projection shape that protrudes from the mounting hole, bulges outward in the radial direction, and engages with the other end surface of the holder member.

As the structure for forming the elastic member in the shape of a protrusion, a structure in which only the elastic member is projected to the outside at the end portion on the side opposite to the flange of the outer cylinder, or a protrusion is provided on the outer cylinder itself and the elastic member is arranged along the protrusion Any structure may be used.

[Operation] In such a device, when the outer cylinder is inserted into the mounting hole of the holder member, the wraparound portion elastically deforms inward in the radial direction, and the flange portion of the outer cylinder engages with one end surface of the holder member. At this time, the wraparound portion projects from the mounting hole and bulges outward in the radial direction. Therefore, when the outer cylinder is completely attached to the holder member, the flange portion of the outer cylinder engages with one end surface of the holder member, and the wraparound portion engages with the other end surface of the holder member. This prevents the buffer body from moving in the axial direction, and prevents the buffer body from coming off the mounting hole.

Further, since the engagement of the wrap-around portion is the engagement with elasticity by the elastic member, some dimensional tolerances and the like in mounting are easily absorbed, and the occurrence of backlash is suppressed. Furthermore, since the end surface of the outer cylinder is covered by the wraparound portion of the elastic member,
Rust is prevented from being generated at the end of the outer cylinder, and peeling of the elastic member from the end face of the outer cylinder due to rust is prevented.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 4 show a shock absorber removal preventing device according to a first embodiment of the present invention.

In FIG. 1, reference numeral 11 indicates the entire buffer body. Buffer
Reference numeral 11 denotes a cylindrical inner cylinder 12, an outer cylindrical cylinder 13, and an inner cylinder 12.
An elastic member 14 made of rubber or the like interposed between the outer cylinder 13 and the outer cylinder 13.
It consists of and. Similar to that shown in FIG. 8, this cushioning body is press-fitted into the mounting hole 16 of the holder member 15 such that the outer peripheral surface portion of the outer cylinder 13 is fitted to the inner peripheral surface portion of the mounting hole 16.

As shown in FIG. 3, the outer cylinder 13 is divided by a slit portion 17 extending in the direction along the axis thereof (two divisions in this embodiment), and one end thereof is formed in a flange portion 13a. A protrusion 18 is provided on an end 13b of the outer cylinder 13 opposite to the flange, the protrusion 18 protruding outward in the radial direction of the outer cylinder 13, that is, to the outer peripheral surface side. The protrusions 18 are obtained by partially deforming the outer cylinder 13 itself by a press or the like, and are arranged in an appropriate number (six in this embodiment) in the circumferential direction of the outer cylinder. The protrusion 18 is formed in a wedge shape so that it is bent outward and then extends obliquely inward again.

At the end 13b of the outer cylinder 13 opposite to the flange, the elastic member 14
Is wrapped around to the outer peripheral surface of the outer cylinder 13. As shown in FIG. 2, the wrap-around portion 14a of the elastic member 14 is formed so as to completely cover the protrusion 18, and the end face of the holder member 15 in a state where the cushioning body 11 is mounted on the holder member 15. 15a
Is formed into a shape that engages with. The outer tube end portion 13b has a double-sided adhesive structure in which the inner elastic member 14 and the outer wraparound portion 14a are adhered together.

In the embodiment apparatus configured as described above, the buffer 11
When is inserted into the mounting hole 16 of the holder member 15, the state shown in FIG. 4 is obtained. That is, since the outer cylinder 13 is provided with the slit portion 17, the elastic member 14 can be deformed by compressive deformation on the inside, and during insertion, the protrusion 18 protruding outward can escape inward in the radial direction. it can. Also, the protrusion
The wraparound portion 14a that covers 18 is elastically deformed inward in the radial direction. When the cushioning body 11 is inserted and the flange portion 13a of the outer cylinder 13 engages with the end surface 15b of the holder member 15, the protrusion 18 and the wraparound portion 14a are projected from the mounting hole 16. In this state, the protrusion 18 and the wraparound portion 14a are elastically restored to the outside, and the cushioning body 11 is attached to the regular position. The shaft side inserted through the inner cylinder 12 and the holder member 15 side elastically support each other through the elastic member 14 mainly in the B direction in FIG. To be done.

When the buffer 11 is installed in the normal position, the protrusion
The wraparound portion 14a that covers 18 is engaged with the end surface 15a of the holder member 15, and the flange portion 13a of the outer cylinder 13 is engaged with the end surface 15b of the holder member 15. As a result, even if a load in the A direction is applied, the cushioning body 11 is prevented from coming off from the mounting hole 16.

Further, since the wraparound portion 14a formed of the elastic member is engaged with the end surface 15a, the elasticity of the wraparound portion 14a easily absorbs some dimensional tolerance. Therefore, play in the axial direction is prevented. If the protrusion 18 is not covered with the wraparound portion 14a, the end surface 15a of the holder member 15 and the protrusion 18a
Interference sound that may be generated by the gap generated between
The inclusion of the wraparound portion 14a ensures prevention.

Further, by forming the wraparound portion 14a, the end surface of the end portion 13b on the side opposite to the flange of the outer cylinder 13 is completely shielded from the outside air, so that the occurrence of rust due to adhesion of moisture or the like is prevented.
Therefore, the peeling of the elastic member from the end surface of the outer cylinder due to the generation of rust, which has been a conventional problem, is prevented.

Next, FIGS. 5 and 6 show a second embodiment of the present invention.

In this embodiment, the shock absorber 21 is an inner cylinder similar to the first embodiment.
22, the outer cylinder 23, and the elastic member 24, but a holder member
The wrap-around portion 24a of the elastic member that engages with the end surface 25a of 25 is configured to have only the elastic member 24 protruding outward in the shape of an ear.

In the second embodiment configured as described above, when the buffer body 21 is inserted into the mounting hole 26 of the holder member 25 and the flange portion 23a is engaged with the end surface 25b of the holder member 25, the wraparound portion 24a is held by the holder portion 25a. The member 25 projects from the mounting hole 26 and is engaged with the end surface 25a. In this embodiment, the wrap-around portion 24a can serve both as a stopper in the axial direction and as a stopper in the vertical direction in FIG.
In the figure, 27 is a shaft and 28 and 29 are stopper fittings. Other configurations and operations are similar to those of the first embodiment.

[Effects of the Invention] As described above, according to the present invention, the wraparound portion of the elastic member is provided at the end of the outer cylinder on the side opposite to the flange, and the wraparound portion is inserted into the mounting hole of the holder member of the outer cylinder. A protrusion that projects elastically inward in the radial direction and protrudes from the mounting hole when the flange portion of the outer cylinder engages with one end surface of the holder member and bulges outward in the radial direction to engage with the other end surface of the holder member. Since it is formed in a shape, it is possible to exert the function of preventing the buffer from coming off at the same time when the mounting of the buffer to the holder member is completed. Therefore, it is not necessary to fix the outer cylinder with bolts and nuts as in the conventional case, which is advantageous in cost.

Also, by covering the outer cylinder end with the wraparound part,
It is possible to prevent the occurrence of rust at the end of the outer cylinder and prevent the peeling of the elastic member due to the occurrence of rust.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cushioning body removal preventing device according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of a II portion of FIG. 1, and FIG. 3 is an outer cylinder of FIG. FIG. 4 is a longitudinal sectional view showing a state of the apparatus of FIG. 1 when the cushioning body is press-fitted, and FIG. 5 is a longitudinal sectional view of a cushioning body disengagement prevention device according to the second embodiment of the present invention. 6 is a perspective view of the cushioning body of FIG. 5, FIG. 7 is a perspective view of a conventional cushioning body, and FIG. 8 is a longitudinal sectional view showing a mounting state of the cushioning body of FIG. 11, 21 …… Cushion body 12, 22 …… Inner cylinder 13, 23 …… Outer cylinder 14, 24 …… Elastic member 14a, 24a …… Wrapping part 15, 25 …… Holder member 15a, 25a …… End face 15b, 25b …… End face of holder member 16, 26 …… Mounting hole 17 …… Cut part 18 …… Protrusion

Claims (4)

[Scope of utility model registration request] Claim: What is claimed is: 1. An inner cylinder and an outer cylinder, which is divided by a slit portion extending in a direction along the axis and has one end formed in a flange shape, are connected by an elastic member, and an outer peripheral surface portion of the outer cylinder is a holder member. In the shock absorber fitted to the inner peripheral surface portion of the mounting hole, the inner peripheral surface and the outer peripheral surface of the end portion on the side opposite to the flange of the outer cylinder are covered by the wraparound portion of the elastic member, and the wraparound portion of the elastic member is covered by the outer cylinder. When it is inserted into the mounting hole of the holder member, it is elastically deformed inward in the radial direction, and when the flange portion of the outer cylinder engages with one end surface of the holder member, it projects from the mounting hole and bulges outward in the radial direction. A shock-absorbing device according to claim 1, wherein the shock-absorbing member is formed in a protrusion shape that engages with the other end surface of the holder member. 2. A utility model registration in which a protrusion is provided at the end of the outer cylinder on the side opposite to the flange so that the outer cylinder itself projects outward, and the outer peripheral surface side of the projection is covered by the wraparound of the elastic member. The device for preventing the buffer from coming off according to item 1. 3. The cushioning body slip-out prevention device according to claim 2, wherein the projection is formed in a wedge shape. 4. The cushioning body according to claim 1, wherein an end portion of the outer cylinder on the side opposite to the flange is adhered on both sides to an inner elastic member and a wrap-around portion of the outer elastic member. Prevention device.