JPH056259U - Dust cover of shock absorber for vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a dust cover for a vehicle shock absorber, which prevents the bump cushion from expanding outward during compression. A dust cover 24 of a shock absorber for a vehicle, which is made of a bellows-like elastic body and is fitted to an outer peripheral surface of a bump cushion 18 mounted on an outer peripheral surface of an upper portion of a piston rod 14 of the shock absorber for a vehicle and surrounds the piston rod 14. In addition, the upper side surface 30 is formed into a tubular shape having no bellows shape, and a part or the entire circumference thereof is thicker than the bellows-shaped portion, and the inside of the upper side surface 30 contacts the upper outer peripheral surface of the bump cushion 18. I decided to do it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dust cover for a vehicle shock absorber.

[0002]

[Prior Art]

 Conventionally, a shock absorber mainly composed of a shock absorber has been used in a vehicle in order to damp and reduce the impact caused by the unevenness of the road surface and improve the running stability. As shown in FIG. 6, the shock absorber has an upper spring seat 10 and an upper end of a piston rod 14 of a shock absorber 12 fixed to a vehicle body 16, and an outer periphery of an upper portion of the piston rod 14 is made of a cylindrical elastic body. A bump cushion (also called a bound bumper) 18 and a dust cover 20 made of a bellows-like elastic body that surrounds the outer periphery of the bump cushion 18 and hangs downward are fitted into the bump cushion 18 and the upper spring seat. The upper end of the coil spring 21 is supported on the lower surface of the edge of the coil 10. An insulator 11 made of an elastic material such as rubber is arranged between the upper spring seat 10 and the vehicle body 16 in order to further reduce the impact.

The bump cushion 18 prevents the upper end of the cylinder 22 of the shock absorber from directly colliding with the vehicle body 16 via the upper spring seat 10 due to a bad road or the like, and attenuates and reduces the impact. On the other hand, the dust cover 20 surrounds the upper part of the bump cushion 18 to the middle of the cylinder 22 of the shock absorber to prevent dust from entering from the outside. The dust cover 20 has a lower spring seat (not shown) that supports the lower end of the coil spring 21, and the lower end of the dust cover 20 is pressed by the vertical movement of the lower spring seat, or the lower end of the dust cover 20 is a side surface of the cylinder 22 of the shock absorber. When it is locked to the cylinder, it is made of rubber or the like having a relatively thin and uniform thickness of about 1 to 2 mm so that it can be expanded and contracted by the vertical movement of the cylinder. The upper spring seat 10 is formed in a substantially disc shape, and the edge portion 10a is bent downward in order to increase the strength and to support the end portion of the coil spring 21.

However, in the above vehicle shock absorber, when the bump cushion 18 is compressed by the upper end of the cylinder 22 as shown in FIG. 7, the bump cushion 18 and the upper portion of the dust cover 20 excessively move outward. There were problems such as swelling and insufficient spring characteristics being obtained, or the durability of the bump cushion being reduced. In particular, the bulge of the bump cushion was remarkable when the distance between the downward bent portion of the upper spring seat edge portion 10a and the upper outer surface of the bump cushion 18 was large.

[0005]

[Problems to be solved by the device]

 Therefore, in view of the above points, the present invention provides a dust cover for a shock absorber for a vehicle, which prevents the bump cushion from expanding outward during compression.

[0006]

[Means for Solving the Problems]

 To achieve the above object, the present invention is a dust cover made of a bellows-like elastic body that is fitted to an outer peripheral surface of a bump cushion mounted on an outer peripheral surface of an upper portion of a piston rod of a vehicle shock absorber and surrounds the piston rod. In the above, the side surface of the upper part has a cylindrical shape without a bellows shape, and a part or the entire circumference thereof is thicker than the bellows-shaped part so that the inside of the upper side surface contacts the upper outer peripheral surface of the bump cushion. I did it.

[0007]

[Action]

 In the dust cover of the present invention, a part or the entire circumference of the upper side surface is thicker than the bellows-shaped portion, so that the thick portion has high rigidity. Therefore, in the bump cushion in which the upper outer peripheral surface is inscribed on the thick side surface of the dust cover, outward bulging during compression is prevented by the thick portion on the upper side surface of the dust cover. The thickness of the upper side surface of the dust cover is preferably thick on the entire side surface of the upper portion, but may be a part thereof. For example, it is possible to provide thick portions formed of protrusions at predetermined intervals, or to thicken only the side farther from the downward bent portion of the upper spring seat. The thickness of the dust cover is preferably 4 mm or more in the thickened portion of the upper side surface and 1 to 3 mm in the other portion in order to prevent the bump cushion from bulging while maintaining the elasticity of the dust cover.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a dust cover according to an embodiment of the present invention, FIG. 2 is a schematic sectional view of a vehicle shock absorber equipped with the dust cover, and FIG. It is a schematic sectional drawing which shows. The same parts as those shown in FIGS. 6 and 7 of the prior art are designated by the same reference numerals.

The dust cover 24 of the present embodiment is formed of a bellows-like elastic body having a shock absorber piston rod insertion hole 26 formed in the upper surface thereof, and a lower end 28 is opened, and a side surface 30 of the upper part of the dust cover 24 has a bellows-like shape. It has a large cylindrical shape with no thickness. The side surface 30 portion of the upper portion of the dust cover contacts with the outer peripheral surface of the upper portion of the bump cushion 18 when the dust cover 24 is incorporated into the shock absorber, and regulates the outward expansion of the bump cushion 18. Is. The dust cover 24, which varies depending on the material of the dust cover itself, usually has an upper side surface 30 of 15 to 40 mm from the upper end which is a cylindrical shape having a large thickness without a bellows shape, and the thickness of the upper side surface 30 is 4 mm. As described above, the thickness of the side surface of the other part is 1 to 3 mm. In the present embodiment in which the dust cover 24 is made of rubber, the upper side surface 30 from the upper end to 26 mm is made a portion having no bellows shape, the thickness is 5 mm, and the other portion is 2 mm. Further, the dust cover 24 is capable of accommodating the bump cushion 18 therein, and the lower end thereof has a size reaching the middle of the cylinder of the shock absorber, and the upper outer peripheral surface of the bump cushion 18 and the upper side surface 30 of the dust cover 24. It consists of an inner diameter that the inner surface contacts.

As shown in FIG. 2, the dust cover 24 is fitted onto the outer periphery of the piston rod 14 of the shock absorber together with the bump cushion 18 housed inside and fixed to the lower surface of the upper spring seat 10. At this time, the upper side surface 30 having a large thickness of the dust cover comes into contact with the upper outer peripheral surface of the bump cushion 18. The bump cushion 18 is made of a substantially cylindrical urethane elastomer elastic body, has a predetermined number of compression grooves formed in the outer circumferential direction, and a through hole for inserting a piston rod of a shock absorber in the vertical direction. ing. Further, the dust cover 24 and the bump cushion 18 are fixed to the lower surface of the upper spring seat 10 with an adhesive or the like. The upper ends of the upper spring seat 10 and the shock absorber piston rod 14 are fixed to the vehicle body 16 via an insulator 11 made of rubber or the like, and a coil spring 21 is provided between the upper spring seat 10 and the lower spring seat (not shown). Is supported. A stopper sheet 32 made of an elastic material such as rubber is provided on the upper surface of the cylinder 22 of the shock absorber 12. The stopper sheet 32 serves to absorb the collision between the bump cushion 18 and the cylinder 22 as much as possible, and when the outer diameter of the cylinder 22 is smaller than the outer diameter of the lower surface of the bump cushion 18, the upper surface of the cylinder 22 is bump cushion. This is to prevent cracks on the lower surface of the bump cushion by cutting into the lower surface of the cushion 18.

In the above vehicle shock absorber, the piston rod 14 of the shock absorber 12 expands and contracts due to the unevenness of the road surface and the like, and the cylinder 22 of the shock absorber moves up and down relatively to absorb the shock. Then, when the cylinder 22 largely moves up and down due to a bad road and collides with the lower end of the bump cushion 18, the bumpion 18 is compressed by the cylinder 22 via the stopper sheet 32 as shown in FIG. The shock is alleviated by the compressive deformation of the bump cushion 18. At that time, since the outer peripheral surface of the upper portion of the bump clamp cushion 18 is in contact with the inside of the upper side surface 30 of the dust cover 24, which has a large thickness, the outer shape of the bump cushion 18 depends on the rigidity of the upper side surface 30 of the dust cover 24. Bulge is prevented. As a result, the bump cushion 18 is free from problems such as deterioration of spring characteristics and deterioration of durability.

FIG. 4 is a schematic cross-sectional view of a vehicle shock absorber equipped with a dust cover 34 according to another embodiment of the present invention. In the dust cover 34 of this embodiment, an annular protrusion 36 is provided on the outer surface of the upper side surface 35 so that the thickness of the portion is larger than that of the bellows-shaped portion. Of course, the projections 36 are not continuous and may be provided on the upper side surface 35 of the dust cover 34 at predetermined intervals.

FIG. 5 is a schematic sectional view of a vehicle shock absorber equipped with a dust cover 38 according to another embodiment. In this dust cover 38, only the upper side surface 40 of the dust cover 38 on the side where the distance between the edge portion 10a of the upper spring seat 10 and the outer surface of the dust cover 38 is large is made thicker than the bellows-shaped portion. is there.

[0014]

[Effect of the device]

 Since the dust cover of the present invention has the above-mentioned configuration, it is possible to prevent the bump cushion from outwardly bulging during compression, and thereby it is possible to achieve the original spring characteristics of the bump cushion and improve the durability. Of. Moreover, since the dust cover of the present invention can be used as it is in place of the conventional dust cover, the structure of the vehicle shock absorber does not become complicated and the number of parts does not increase, resulting in a very practical effect. It is expensive.

[Brief description of drawings]

FIG. 1 is a sectional view of a dust cover according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a vehicle shock absorber equipped with a dust cover according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a bump cushion when compressed in a vehicle shock absorber equipped with a dust cover according to an embodiment of the present invention.

FIG. 4 is a schematic sectional view of a vehicle shock absorber equipped with a dust cover according to another embodiment of the present invention.

FIG. 5 is a schematic sectional view of a vehicle shock absorber equipped with a dust cover according to still another embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a vehicle shock absorber equipped with a conventional dust cover.

FIG. 7 is a schematic cross-sectional view showing a state where a bump cushion is compressed in a conventional vehicle shock absorber equipped with a dust cover.

[Explanation of symbols]

10 Upper Spring Seat 12 Shock Absorber 14 Shock Absorber Piston Rod 18 Bump Cushion 21 Coil Spring 22 Shock Absorber Cylinder 24 Dust Cover According to One Embodiment of the Present Invention 30 Top Side of Dust Cover According to One Embodiment of the Present Invention 34 Dust cover 35 according to another embodiment of the present invention 35. Upper side surface of a dust cover according to another embodiment of the present invention 38 Dust cover 40 according to still another embodiment of the present invention 40 According to yet another embodiment of the present invention Upper side of dust cover

Claims (1)

[Claims for utility model registration] 1. A bellows-shaped member that is fitted to the outer peripheral surface of a bump cushion made of a cylindrical elastic body that is mounted on the outer periphery of the upper portion of the piston rod of a vehicle shock absorber and that surrounds the piston rod. In the dust cover made of an elastic body, the upper side surface is formed into a tubular shape having no bellows shape so that part or all of the side surface is thicker than the bellows-shaped portion, and the inside of the upper side surface is the outer circumference of the bump cushion. A dust cover for a vehicle shock absorber characterized in that it comes into contact with the surface.