JP2000088031A - Attaching structure of dust cover for shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate attachment, and effectively cover a bound stopper by holding an one end part of the bound stopper to an inversed cup shaped holding metal fitting fixed to a projection tip end part of a piston rod, and locking a dust cover with a supporting plate part formed on an opening edge part of the holding metal fitting. SOLUTION: A nearly inversed cup shaped holding metal fitting 18 provided with a disk-shape bottomed plate part 28 on which a mounting hole 32 is formed and a nearly cylindrical wall part 30, is externally fixed to a projection tip end part of a piston rod 12. A thin wall cylindrical shaped dust cover 14 made of a synthetic resin material is assembled with the holding metal fitting 18. A lock protrusion piece 74 of a lock claw part arranged on an upper end part of the dust cover 14 is got over a supporting plate part 34 of the holding metal fitting 18, and the supporting plate part 34 is fitted and fixed to a lock recessed groove 76. All length of the piston rod 12 including an upper end part of a cylinder 20 is covered with the dust cover 14 under a mounting condition hung downward in an axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION 【Technical field】

The present invention relates to a mounting structure of a dust cover for covering a piston rod in a shock absorber constituting a suspension mechanism of a vehicle.

[0002]

2. Description of the Related Art Conventionally, a shock absorber has been employed in a suspension mechanism of a vehicle for the purpose of damping vibrations due to spring elasticity of a suspension system. In such a shock absorber, in order to cover the oil seal portion of the cylinder and the piston rod, generally, a cylindrical dust cover for the shock absorber that covers the piston rod by being externally attached to the piston rod is used. Has been adopted.

[0003] By the way, as a mounting structure of such a dust cover to a shock absorber, for example, Japanese Utility Model Publication No.
As described in Japanese Unexamined Patent Publication No. 10000, etc., a thick-walled cylindrical bound stopper which is externally mounted on a piston rod and elastically limits the retraction-side stroke end of the piston rod, from the lower end thereof. A structure in which the dust cover is integrally formed by extending downward,
As described in Japanese Unexamined Patent Publication No. 927, etc., a structure in which an upper end opening of a dust cover is fitted and fixed to an outer peripheral surface of a lower end portion of a bound stopper has been proposed.

However, the former structure has a problem that the shape of the mold of the bound stopper is complicated and manufacturing is difficult, and that the materials of the bound stopper and the dust cover are restricted to each other. Further, the latter structure has a problem in that the elastic characteristics of the bound stopper are adversely affected, and it is difficult to prevent the dust cover from being detached when the bound stopper is elastically deformed. In addition, in any of these structures, there is a problem in the protection of the bound stopper because the bound stopper is not covered with the dust cover. In particular, when the bound stopper made of foamed polyurethane is employed, water is not applied to the bound stopper. Since sprinkling cannot be prevented by the dust cover, deterioration of the characteristics and durability of the bound stopper due to water absorption tends to be a problem.

[0005] In order to deal with such a problem,
As described in Japanese Utility Model Application Laid-Open No. 58-32002 and the like, a dust cover made of a rubber elastic body is adopted, and an upper end opening of the dust cover is set to a supporting bracket for supporting an upper end of the coil spring. It is also conceivable to fit and fix based on the rubber elasticity and to reinforce with an adhesive treatment as necessary to support the bound stopper in a state of covering the entirety of the bound stopper. However, the rubber dust cover is inevitably subject to aging due to ozone attack, and may fall off due to a decrease in elastic fitting / fixing force or cracking. In addition, since such a structure is premised on the existence of the coil spring, it cannot be adopted unless the coil spring is extrapolated and mounted on the shock absorber, and in addition, there is a problem that the mounting operation is troublesome. .

[0006]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to easily attach the shock absorber to a shock absorber, and to advantageously use a bound stopper. An object of the present invention is to provide a novel dust cover mounting structure for a shock absorber that can be covered.

[0007]

In order to solve such a problem, a feature of the present invention is that it has a cylindrical shape and is mounted on a piston rod protruding from a cylinder of a shock absorber in an externally inserted state. In this structure, a dust cover for a shock absorber that covers the piston rod is attached to the piston rod, and a cup-shaped holding bracket that opens toward the cylinder is fixed to a protruding tip portion of the piston rod. The holding metal fitting holds one end in the axial direction of a bound stopper that is externally arranged on the piston rod and elastically restricts a retraction side stroke end of the piston rod based on contact with the cylinder. On the other hand, the supporting edge portion is formed by expanding the opening edge portion of the holding bracket to the outer peripheral side, and the dust cover is made of synthetic resin. The dust cover is supported by the piston rod via the holding fitting by locking one end of the dust cover in the axial direction with respect to the support plate of the holding fitting. is there.

In the mounting structure of the dust cover for the shock absorber to the piston rod according to the present invention, a holding fitting for holding one end in the axial direction of the bound stopper is employed, and the dust cover is supported by the holding fitting. Thereby, not only the piston rod but also the entirety of the bound stopper can be advantageously covered with the dust cover. In addition, by using the holding metal, the bound stopper can be firmly and easily supported, and by using the holding metal, the dust cover can be advantageously formed without requiring a special member. It was possible to support, for example, even if the coil spring is not extrapolated to the shock absorber, etc.
A dust cover may be advantageously supported.

In addition, since the dust cover can be formed separately from the bound stopper, each of the dust cover and the bound stopper can be easily manufactured separately, and the synthetic resin can be formed without deteriorating the characteristics of the bound stopper. Thus, the dust cover can be advantageously used to improve the ozone resistance and thus the durability of the dust cover.

In the dust cover mounting structure according to the present invention, the locking structure of the dust cover with respect to the holding bracket is not particularly limited. The dust cover is locked to the holding fitting by integrally forming a locking portion having an extending locking groove on the inner peripheral surface and fitting an outer peripheral edge of the support plate portion into the locking groove. This structure is suitably adopted. According to such a structure, since the dust cover can be locked to the outer peripheral edge of the support plate portion, the inner diameter of the dust cover can be advantageously secured without increasing the outer diameter of the holding bracket. This makes it possible to advantageously secure a space for disposing the bound stopper.

In this case, the locking portion provided with the locking groove can be formed continuously over the entire circumference of the dust cover. The structure in which a plurality are formed apart from each other in the circumferential direction is suitably adopted. By forming the locking portion by dividing it in the circumferential direction, the elastic deformation of the dust cover in the direction perpendicular to the axis at each locking portion is easily allowed, and the locking operation to the holding bracket is facilitated. Becomes In addition, such a locking portion is preferably formed so as to protrude outward in the axial direction from the peripheral edge of the opening at one axial end of the dust cover in a claw shape.
Further, it is desirable that the support plate portion of the holding fitting is formed in an annular shape over the entire circumference in the circumferential direction of the holding fitting, whereby it is possible to easily engage the dust cover without considering the direction when the dust cover is locked. Stop work can be performed.

Further, in the dust cover mounting structure according to the present invention, a bound stopper made of a sponge-like elastomer can be suitably employed. That is, according to the structure of the present invention, the entirety of the bound stopper can be covered with the dust cover, and the dust cover can advantageously prevent the muddy water or the like from splashing on the bound stopper. By applying the present invention to a shock absorber to which a sponge-like elastomer made of a sponge-like elastomer such as foamed polyurethane is liable to be sprayed, the effect of the present invention is more advantageously exhibited.

Further, in the dust cover mounting structure according to the present invention, the cylindrical wall portion of the holding fitting is provided with an inverted taper narrowing toward the opening side, and the cylindrical wall portion is
A structure in which one end in the axial direction of the bound stopper is fitted and fixed by being fitted is suitably employed. By employing such a structure, the holding strength of the bound stopper by the holding metal can be more advantageously and stably obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a specific example of a mounting structure of a dust cover for a shock absorber according to the present invention. In the present embodiment, as illustrated, a dust cover 14 is externally inserted with respect to the piston rod 12 of the shock absorber 10, and the piston rod 12
Attached to the protruding tip of the
The dust cover 14 is supported by a holding bracket 18 for holding the dust cover. In the following description, the up-down direction refers to the up-down direction in FIG. 1 in principle.

More specifically, the shock absorber 10
Has a well-known structure and includes a cylinder 20 in which oil or the like is sealed, and a piston rod 12 projecting from the cylinder 20 and capable of axially projecting / retracting. Although not done, while the cylinder is attached to the suspension arm or the like, the piston rod 12 is attached to the body 24,
Piston rod 1 according to swing of suspension arm
2 is mounted on a suspension mechanism of an automobile while being driven in the axial direction. In addition, a male screw groove is engraved at the protruding tip portion of the piston rod 12, and a tightening bolt 26 for attaching the piston rod 12 to the body 24 is screwed. Further, the shock absorber 10 of the present embodiment, when mounted on an automobile, has a cylinder 2 as shown in FIG.
From 0, the piston rod 12 is positioned so as to protrude substantially vertically upward.

A holding bracket 18 is externally attached to the projecting tip of the piston rod 12 of the shock absorber 10, and is fixedly mounted.
As shown in FIGS. 2 and 3, the holding member 18 has a substantially inverted cup shape that opens downward, and has a disc-shaped bottom plate portion 28 and a substantially cylindrical tube. Wall 3
0 is provided. At the center of the bottom plate portion 28, a mounting hole 32 penetrating vertically is formed. Furthermore, the cylindrical wall 3
Reference numeral 0 denotes a tapered cylindrical shape having a reverse taper whose diameter gradually decreases toward the opening. The cylindrical wall 30
Is extended toward the outer peripheral side over the entire circumference in the circumferential direction, so that the annular plate-shaped support plate portion 34 that expands in a flange shape outward in the radial direction is integrally formed. Have been.

A bound stopper 16 is fitted into the holding fitting 18 and assembled. As shown in FIGS. 4 and 5, the bound stopper 16 has a substantially thick cylindrical shape as a whole, and the inner hole 36 has a diameter dimension corresponding to that of the piston rod 12 of the shock absorber 10. The outer diameter is set larger than the outer diameter, and the outer diameter is reduced as a whole as it goes downward in the axial direction, and the outer diameter of the lower end portion is the outer diameter of the cylinder 20 of the shock absorber 10. It is set to be almost the same as. The outer peripheral surface of the bound stopper 16 has a plurality of grooves 38 extending in the circumferential direction with a substantially V-shaped cross section.
However, a plurality of circumferential grooves 40 having a substantially V-shaped cross section are formed on the inner peripheral surface and extend in the circumferential direction on a thick portion where the concave groove 38 is not formed, while a plurality of grooves are formed on the inner circumferential surface. ing. The bound groove 16 and the circumferential groove 40 make the bound stopper 16 have a substantially bellows shape. When an axial load is applied, buckling deformation is prevented, and elastic deformation is stabilized in the axial direction. And stable spring characteristics are exhibited.

In particular, in the present embodiment, a sponge-like elastomer is used as the bound stopper 16. Specifically, for example, polyurethane foam (polyurethane foam) is preferably used in consideration of durability, cost, load resistance, water resistance, spring characteristics, and the like.

Further, the upper end (large diameter side end) of the bound stopper 16 in the axial direction has an inverted taper substantially corresponding to the inner peripheral surface shape of the cylindrical wall portion 30 of the holding bracket 18 with respect to the outer peripheral surface thereof. A portion extending from the upper end in the axial direction to a predetermined length is formed as a reverse tapered fitting surface 42 whose diameter gradually decreases toward the lower side in the axial direction. In the upper end surface of the bound stopper 16 in the axial direction, a plurality of recessed air vent grooves 44 extending in the radial direction from the mounting hole 32 to the outer peripheral surface are formed.

The upper end of the bound stopper 16 in the axial direction is, as shown in FIG.
And the fitting surface 42 is fitted into the cylindrical wall portion 30 and is closely attached thereto. In order to more advantageously obtain the holding force of the cylinder wall portion 30 for fitting the bound stopper 16, the outer diameter of the fitting surface 42 is set slightly larger than the inner diameter of the cylindrical wall portion 30. It is preferable that a radial compressive force be applied to the fitting surface 42 in a state where the fitting surface 42 is assembled to the wall portion 30. Further, in the present embodiment, particularly, the upper end in the axial direction of the bound stopper 16 fitted into the cylindrical wall portion 30 is made thicker in the radial direction than the other portions, so that the cylindrical wall portion 30 holds the fitting. The power has been improved.

Further, as shown in FIG. 1, the holding fitting 18 to which the bound stopper 16 is attached is externally inserted into the piston rod 12 of the shock absorber 10 through the mounting hole 32. The peripheral edge of the mounting hole 32 in the bottom wall portion 28 abuts against the ring-shaped projection 43 protruding near the distal end of the piston rod 12, and is positioned and arranged at the distal end of the piston rod 12. . Thereby, the bound stopper 16
By being supported by the holding bracket 18 at the large-diameter side end portion in the upper part in the axial direction, the piston rod 12 extends toward the cylinder 20 from the distal end portion, and the lower end surface in the axial direction is
It is externally attached to the piston rod 12 in a state of facing the cylinder 20 with a predetermined distance therebetween. When the piston rod 12 is driven to the retracting side, the tip end surface of the bound stopper 16 abuts on the upper surface in the axial direction of the cylinder 20, and the gap between the bottom wall portion 28 of the holding bracket 18 and the upper surface in the axial direction of the cylinder 20. By being compressed in the axial direction, the stroke end position of the retraction side of the piston rod 12 can be buffered or elastically defined based on the elastic force.

Further, the piston rod 12 of the shock absorber 10 is more axially distal than the holding bracket 18,
Upper and lower mounting brackets 46 and 48 are extrapolated, and upper and lower cushion rubbers 5 are provided between the upper and lower mounting brackets 46 and 48.
By sandwiching the body 24 through 0, 52,
The protruding tip of the piston rod 12 is elastically attached to the body 24. Here, the upper mounting bracket 46 has an annular plate shape, while the lower mounting bracket 48 has a shallow cup shape that opens upward, and each of the upper mounting brackets 46 is provided at the center. In the inserted insertion holes 54 and 56, they are externally mounted on the piston rod 12. The upper and lower cushion rubbers 50 and 52 are
Each of them is formed of a rubber elastic body, has a substantially annular block shape, and has an inner diameter substantially equal to the outer diameter of the piston rod 12.

The bottom wall 58 of the lower mounting bracket 48
Are superimposed on the upper surface of the bottom wall portion 28 of the holding bracket 18,
It is fixed by welding or the like as necessary, and the lower cushion rubber 52 is fitted into the cylindrical wall portion 60 of the lower mounting bracket 48, and is axially upward from the opening of the cylindrical wall portion 60. It is assembled in a protruding state. Further, the piston rod 12 is provided on the upper surface of the lower cushion rubber 52.
Is inserted into the mounting hole 62 of the body 24,
The bodies 24 are overlapped and abutted. Also,
An upper cushion rubber 50 and an upper mounting bracket 46 are externally inserted into the piston rod 12 protruding upward from the mounting hole 62 of the body 24, and a tightening bolt 26 is provided at a tip end of the piston rod 12. It is screwed. As a result, the tip end of the piston rod 12 elastically moves the body 24 between the upper and lower fittings 46 and 48 fixedly attached to the piston rod 12 via the upper and lower cushion rubbers 50 and 52. By being clamped and sandwiched, it is elastically attached to the body 24 based on the elasticity of the upper and lower cushion rubbers 50 and 52.

In such an assembled state, the tightening force of the tightening bolt 26 presses the lower mounting bracket 48 and the holding bracket 18 against the ring-shaped projection 43 via the cushion rubbers 50 and 52. Due to the direction, the lower mounting bracket 48 and the holding bracket 18 can be effectively positioned and fixed only by the ring-shaped projection 43, and other special fixing structures are not necessarily required. Further, a flange-like flange 64 extending radially outward is formed integrally and continuously with the periphery of the opening of the cylindrical wall portion 60 of the lower mounting bracket 48 in the circumferential direction. Are positioned opposite the lower surface of the body 24 with an annular stopper rubber 66 formed integrally with the outer peripheral surface of the lower cushion rubber 52 therebetween. When a large axial load is input, the flange portion 64 comes into contact with the body 24 via the stopper rubber 66 so that a non-linear spring characteristic is exhibited.

Further, the holding fitting 18 attached to the piston rod 12 in this manner includes the piston rod 12
The dust cover 14 is assembled before or after mounting on the dust cover. The dust cover 14 is provided with the cylinder 20 of the shock absorber 10 and the bound stopper 1.
It has a thin cylindrical shape with a diameter larger than 6 and its thickness is slightly reduced as it goes downward in the axial direction. The material of the dust cover 14 is as follows.
Synthetic resin materials can be used, for example, durability, impact resistance,
In consideration of cost and the like, general-purpose resins such as polypropylene, polyethylene, and polyvinyl chloride can be suitably used.

The dust cover 14 is mounted on the shock absorber 10 in a state of being suspended downward in the axial direction by being supported by the holding bracket 18 at the upper end in the axial direction.
The entire length of the piston rod 12 including the upper end of the piston rod 12 is covered.

Here, locking claws 70 protruding outward in the axial direction are integrally formed at the axially distal end of the dust cover 14 at four locations on the circumference, respectively. The stop claws 70 are fixedly locked to the outer peripheral edge of the support plate 34 of the holding fitting 18. More specifically, the dust cover 14
The axial end portion is a thick portion 72 whose thickness is slightly increased radially inward and outward, and the axial end surface of the thick portion 72 has a circumferential direction. Four locking claw portions 70 are provided so as to be equally positioned. The locking claw portion 70 protrudes in the axial direction from the outer peripheral edge of the axial end surface of the thick portion 72, and has a locking protruding radially inward on the inner peripheral surface of the protruding tip portion. Projection piece 7
4 protrude over the entire length in the circumferential direction. Thereby, a locking groove 76 extending in the circumferential direction is formed on the inner peripheral surface side of each locking claw portion 70 between the axial end surface of the thick portion 72 and the opposing surface of the locking projection piece 74. I have.

Then, the inner diameter of the locking groove 76 (the locking grooves 76, 76 opposed to each other in the radial direction of the dust cover 14).
Is substantially equal to the outer diameter of the support plate portion 34 formed on the holding member 18, and the width (inner dimension in the axial direction) of each locking groove 76 is reduced. , Support plate 3
4 is substantially the same as the wall thickness dimension.

Thus, the dust cover 14 is
From the side of the locking claw 70 side, it is externally inserted into the holding fitting 18, and the locking projection piece 74 of each locking claw 70 is held based on the elastic deformation of each locking claw 70 outward in the radial direction. By moving over the support plate portion 34 of the metal fitting 18, the support plate portion 34 is fitted into the locking groove 76, and the front and back surfaces of the support plate portion 34 are
The dust cover 14 is sandwiched between the axial end surface of the thick portion 72 and the opposing surface of the lower surface of the locking projection 74. As a result, the upper end of the dust cover 14 in the axial direction is fixedly locked to the support plate 34 of the holding member 18, and the dust cover 14 is thus held via the holding member 18 by the shock absorber. It is fixedly attached to and supported by the protruding tip portion of the ten piston rods 12. Each locking claw 7
The protruding tip portion 0 has an inclined surface 7 whose inner peripheral corner is notched.
8 to improve the workability of attaching the dust cover 14 to the holding bracket 18.

With the structure as described above, the dust cover 1
In the shock absorber 10 in which the dust cover 4 is assembled, the dust cover 14 is locked to the holding bracket 18 holding the upper end of the bound stopper 16 and is supported in a suspended state. With the cover 14, not only the piston rod 12 of the shock absorber 10 but also the bound stopper 16 can be covered almost completely over the entirety thereof. Therefore, the bouncing stopper 16 caused by water splashes or the like when the automobile runs.
Sprinkling of water on the bung stopper 16 can be effectively prevented, and a decrease in characteristics and durability due to water absorption of the bound stopper 16 can be advantageously reduced or prevented.

Further, since the dust cover 14 is locked by the holding member 18 made of a rigid material, the supporting force of the dust cover 14 can be stabilized without being affected by the elastic deformation of the bound stopper 16 or the like. In addition, an accident such as falling off of the dust cover 14 can be reduced or avoided.

In addition, the dust cover 14 is attached to the holding fitting 1.
8, the shock absorber 10
The dust cover 14 can be assembled to the shock absorber 10 irrespective of whether or not the coil spring is externally mounted. In short, the holding member 18 for supporting the dust cover 14 is a separate member from the spring receiving member for receiving the coil spring. Therefore, the dust cover 14 can be easily mounted and the dust cover 14 can be made compact. Can be formed.

The dust cover 14 is formed separately from the bound stopper 16.
Irrespective of the material, etc., it can be formed of any synthetic resin material, so that quality deterioration due to ozone attack, which has been a major problem with conventional rubber dust covers, can be advantageously eliminated, and excellent durability In addition to being easily obtainable, it is lightweight, inexpensive and excellent in manufacturability as compared with metals and the like.

In particular, in the present embodiment, the holding bracket 18 employs an annular support plate portion 34 extending continuously over the entire periphery of the opening, and the dust cover 14.
In this embodiment, a locking piece structure having a substantially U-shaped cross section provided with a locking concave groove 76 is adopted, and when the dust cover 14 is locked to the holding bracket 18, the axial end face of the dust cover 14 The holding bracket 18 is substantially in close contact with the lower surface in the axial direction of the support plate portion 34 over the entire circumference in the direction.
Also, the generation of a gap at the locking portion of the dust cover 14 is effectively prevented, and more excellent cover performance is exhibited.

In this embodiment, the support plate 3
Since the dust cover 14 is locked to the outer peripheral edge of the dust stopper 4, the internal space of the dust cover 14 is advantageously ensured, and even when the bound stopper 16 is elastically deformed, Contact with the dust cover 14 can be avoided. In particular, in the present embodiment, since the bound stopper 16 made of foamed polyurethane whose volume decreases with compression deformation is employed,
Even when a relatively hard dust cover 14 is employed, the dust cover 14
This has the advantage of preventing damage to the device.

Furthermore, in this embodiment, since the cylindrical wall portion 30 of the holding bracket 18 has an inverse taper, even when the dust cover 14 is locked to the support plate portion 34, the support plate portion The increase in the outer diameter of the dust cover 34 and the dust cover 14 is suppressed. Therefore, the volume of the bound stopper 16 can be advantageously secured within the range of the maximum allowable outer diameter.

The embodiment of the present invention has been described in detail above, but this is merely an example.
It should not be construed as being limited by the specific description in such embodiments.

For example, the holding member 18 of the dust cover 14
The structure for locking to the (support plate portion 34) is not limited to the above-described embodiment, and various structures can be adopted.
In particular, in the present invention, a locking structure using the dust cover 14 having a locking projection that is locked to the support plate portion 34 by sandwiching the support plate portion 34 from both front and back surfaces is suitably adopted. You. That is, the dust cover 1 made of synthetic resin
In 4, the support force of the dust cover 14 on the support plate 34 can be advantageously obtained by such a locking structure.

More specifically, for example, as shown in FIG. 8, a locking pin 84 having a barbed locking head 82 is fitted to the upper end face of the dust cover 14 in the axial direction. Several are integrally formed so as to protrude outward in the axial direction, and a locking pin 84 is inserted into a locking hole 86 penetrating through the support plate portion 34, and is locked by the locking head 82 so as not to come out. You may do it. As shown in the figure, it is desirable that the locking pin 84 be provided with a notch 88 extending in the axial direction to facilitate insertion into the locking hole 86. Alternatively, although not shown, the outer peripheral portion of the support plate portion 34 is folded back to the inner peripheral side, and the locking protrusion protruding from the outer peripheral surface of the tip portion of the dust cover 14 is fitted into the folded portion. Then, from the inner peripheral side of the folded portion, the dust cover 1
A locking structure for locking the lock 4 or the like can also be adopted.

The structure for attaching the piston rod 12 to the body or the like is not limited to the above embodiment. And, depending on the mounting structure, the mounting bracket 48 or the like that is assembled by being superimposed on the holding bracket 18 is not always necessary.

Further, it is possible to improve the crack resistance and to provide a reinforcing effect by making only the lower end of the dust cover 14 thick.

Further, in the above embodiment, the holding fitting 18
Although the cylindrical wall portion 30 has an inverted tapered cylindrical shape, the cylindrical wall portion 30 may have an inverted tapered cylindrical shape. In particular, since the pulling force hardly acts on the bound stopper 16 in the mounted state, generally, an effective holding force with respect to the bound stopper 16 can be obtained without applying a reverse taper.

Further, the material of the bound stopper 16 is not particularly limited, and a bound stopper made of a rubber elastic body, a foamed rubber elastic body, or the like may be appropriately employed.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0046]

As is apparent from the above description, in the mounting structure of the dust cover for the shock absorber according to the present invention, the dust cover is supported by using the holding metal fitting for holding the bound stopper, so that the piston rod is provided. With a simple structure, the dust cover that covers the entirety of the bound stopper can be attached to the shock absorber. In addition, since the dust cover could be formed separately from the bound stopper, the dust cover made of synthetic resin could be adopted without deteriorating the characteristics of the bound stopper, etc. Deterioration due to the conventional ozone attack is avoided, and excellent durability is exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing a mounting structure of a dust cover for a shock absorber as one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a holding fitting used in the embodiment shown in FIG.

FIG. 3 is a bottom view in FIG. 2;

FIG. 4 is a plan view of a bound stopper used in the embodiment shown in FIG. 1;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a plan view of a dust cover used in the embodiment shown in FIG.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a main part of a mounting structure of a dust cover for a shock absorber as another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shock absorber 12 Piston rod 14 Dust cover 16 Bound stopper 18 Holder 20 Cylinder 34 Support plate 70 Locking claw 76 Locking groove

Claims (5)

[Claims] 1. A structure for mounting a dust cover for a shock absorber to a piston rod which has a cylindrical shape and covers the piston rod by being externally mounted on the piston rod protruding from a cylinder of the shock absorber. And fixing a cup-shaped holding bracket that opens toward the cylinder to a protruding tip portion of the piston rod,
The holding fitting is configured to hold one end in the axial direction of a bound stopper which is externally arranged on the piston rod and elastically limits the retracted stroke end of the piston rod based on contact with the cylinder. On the other hand, the support plate is formed by expanding the opening edge portion of the holding bracket to the outer peripheral side, and a synthetic resin thing is adopted as the dust cover, and one end in the axial direction of the dust cover is attached to the holding A dust cover mounting structure for a shock absorber, wherein the dust cover is supported by the piston rod through the holding metal fitting by locking with respect to the support plate portion. 2. A locking portion having an inner circumferential surface with a locking groove extending in a circumferential direction is integrally formed at one axial end side of the dust cover, and the locking groove is formed outside of the support plate portion. The mounting structure of a dust cover for a shock absorber according to claim 1, wherein the dust cover is locked to the holding fitting by fitting a peripheral portion. 3. The mounting structure for a dust cover for a shock absorber according to claim 2, wherein a plurality of the locking portions are formed apart from each other in a circumferential direction of the dust cover. 4. A mounting structure for a dust cover for a shock absorber according to claim 1, wherein said bound stopper is formed of a sponge-like elastomer. 5. A cylindrical wall portion of the holding fitting is provided with a reverse taper narrowing toward an opening, and one end in the axial direction of the bound stopper is fitted into the cylindrical wall portion. The mounting structure for a dust cover for a shock absorber according to any one of claims 1 to 4, wherein the mounting structure is adapted to be fitted and fixed.