JP2002021904A - Hydraulic shock absorber mounting structure - Google Patents

Abstract

(57) [Problem] To provide a hydraulic shock absorber in which a mounting surface of an upper spring seat is closely attached to a vehicle body and firmly mounted, and easily prevents generation of abnormal noise in the mounting portion. A suspension spring (13) is supported on an upper spring seat (16) via a rubber (17).
In the mounting structure of the hydraulic shock absorber 10 in which the mounting surface 31 of the top surface portion of the hydraulic shock absorber 10 is mounted in contact with the vehicle body 1, the protrusion 32 of the rubber 17 is provided in the hole 35 provided in the top surface portion of the upper spring seat 16.
The projections 32 of the rubber 17 projecting from the holes 35 of the upper spring seat 16 are compressed into the vehicle body 1 so that the recesses 36 are fitted around the holes 35 on the top surface of the upper spring seat 16. What was provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic shock absorber mounting structure.

[0002]

2. Description of the Related Art As a hydraulic shock absorber, a lower spring seat is provided on a damper tube, an upper spring seat is provided on a piston rod, a suspension spring is supported on upper and lower spring seats via rubber, and a top surface of the upper spring seat is provided. There is a device which is mounted by bringing the mounting surface of the device into contact with the vehicle body.

[0003]

In the conventional mounting structure of a hydraulic shock absorber, the mounting surface of the upper spring seat and the vehicle body are mounted in close contact only with metal contact. For this reason, when the natural frequency of the entire body including the upper spring seat of the hydraulic shock absorber matches the natural frequency of the vehicle body, the two resonate to generate abnormal noise. It is extremely difficult or substantially impossible to change the natural frequency of the upper spring seat and the vehicle body.

If the mounting surface of the upper spring seat is not in close contact with the vehicle body, the upper spring seat swings and hits the vehicle body during the expansion and contraction operation of the hydraulic shock absorber, resulting in abnormal noise.

SUMMARY OF THE INVENTION It is an object of the present invention to securely attach an upper spring seat mounting surface of a hydraulic shock absorber in close contact with a vehicle body and to easily prevent generation of abnormal noise in the mounting portion.

[0006]

According to a first aspect of the present invention, a lower spring seat is provided on a damper tube, an upper spring seat is provided on a piston rod, and a suspension spring is supported on upper and lower spring seats via rubber. In a mounting structure for a hydraulic shock absorber in which a mounting surface of a top surface portion of an upper spring seat is mounted in contact with a vehicle body, a protrusion of a rubber is fitted and held in a hole provided in a top surface portion of the upper spring seat, and the upper spring seat is held. A rubber recess protruding from the hole of the upper spring seat when it is attached to the vehicle body is provided with a concave portion which is compressed and fitted into the vehicle body around the hole on the top surface of the upper spring seat. It is.

According to a second aspect of the present invention, in the first aspect of the present invention, the rubber projection has a spherical shape, a conical shape, or a continuous shape having a circular longitudinal section.

According to a third aspect of the present invention, the concave portion provided on the top surface of the upper spring seat is a circular or long groove-shaped concave portion.

[0009]

According to the first aspect of the present invention, the following effects are obtained. When the upper spring seat provided in the hydraulic shock absorber is mounted on the vehicle body, the protruding portion of the rubber-shaped bulge-shaped projection held on the upper spring seat with respect to the mounting surface is compressed by the vehicle body and fits so as to escape to the concave portion. In addition, as a result of being in close contact with the vehicle body in a compressed state, the natural frequency of the vehicle body is substantially changed, and generation of abnormal noise due to resonance between the vehicle body and the hydraulic shock absorber can be prevented.

By adjusting the shape of the rubber projection held on the upper spring seat, the rubber capacity, the rubber hardness, the shape of the concave portion provided on the upper spring seat, and the like, the above-mentioned change width of the natural frequency can be appropriately and easily adjusted. it can.

Since the mounting surface of the upper spring seat is firmly adhered to the vehicle body, there is no gap between the mounting surface of the upper spring seat and the vehicle body. There is no occurrence.

Since the rubber held by the upper spring seat is used to support the suspension spring,
The structure can be simplified and the assemblability is good as compared with the case using a rubber sheet or the like separate from the rubber.

The rubber is incorporated into the upper spring seat by fitting and holding the protrusion of the rubber in the hole of the upper spring seat. When the upper spring seat and the rubber are assembled to the hydraulic shock absorber, the rubber is mounted on the rubber. Without falling off,
The assemblability of the hydraulic shock absorber can also be improved.

According to the second aspect of the invention, the following effects are obtained. Since the rubber projection is formed into a continuous shape having a spherical shape, a conical shape or a circular vertical cross section, it is easy to attach the rubber to the hole of the upper spring seat.

According to the third aspect of the invention, the following effects are obtained. Since the concave portion provided on the top surface of the upper spring seat is formed as a circular or long groove-shaped concave portion, the concave portion is formed in a shape corresponding to the convex portion, and the fitting of the convex portion to the concave portion can be improved.

[0016]

FIG. 1 is a front view showing a hydraulic shock absorber.
FIG. 2 is a cross-sectional view showing a mounting structure of the hydraulic shock absorber to the vehicle body, FIG. 3 is a schematic view showing a rubber projection and a concave portion of the upper spring seat, and FIG. 4 is a deformation of the rubber projection and a concave portion of the upper spring seat. It is a schematic diagram which shows an example.

As shown in FIG. 1, the hydraulic shock absorber 10 has a damper tube 11, a piston rod 12, and a suspension spring 13. A lower spring seat 14 is attached to the outer periphery of the damper tube 11, and the piston rod 12 The suspension spring 13 is mounted between the lower spring seat 14 and the upper spring 16 via rubbers 15 and 17.

The hydraulic shock absorber 10 has a wheel-side mounting portion 18 at a lower portion of the damper tube 11, and the vehicle-side mounting portion 1 is attached to an upper spring seat 16 mounted on the piston rod 12.
9 and a mounting bolt 20 is attached to the vehicle body side mounting portion 19. The hydraulic shock absorber 10 absorbs the impact from the road surface by the suspension spring 13, and suppresses the expansion and contraction vibration of the suspension spring 13 by the damping device (not shown) incorporated in the damper tube 11.

In the hydraulic shock absorber 10, a cover 21, a washer 22, a joint collar 23 and a washer 24 are inserted into a small diameter portion on the upper end side of the piston rod 12, and these are fastened by a nut 25. And washers 22, 24
Mount rubbers 26A and 26B are provided around a joint collar 23 sandwiched between the mount rubbers 26A and 26B.
The base 27 of the upper spring seat 16 is sandwiched and fixed between A and 26B. The upper spring seat 16 includes a cup 27A surrounding the mount rubber 26A.

The hydraulic shock absorber 10 press-fits a bump rubber 28 around the piston rod 12 surrounded by the cover 21 and fixes a bump stopper cap 29 around a shaft sealing portion of the damper tube 11 through which the piston rod 12 passes. The bump stopper cap 29 has a contact plate 29A against which the bump rubber 28 abuts when the hydraulic shock absorber 10 is most compressed. Further, the hydraulic shock absorber 10 includes a damper tube 11.
A dust cover 30 is provided to cover the periphery of the piston rod 12 protruding therefrom, and the upper end 30 </ b> A of the dust cover 30 is held between the cover 21 and the upper end surface of the bump rubber 28.

However, in the case of the hydraulic shock absorber 10, FIG.
As shown in the figure, the mounting surface 31 of the top surface portion of the upper spring seat 16 is tightly attached to the vehicle body 1 so as to be firmly attached thereto, and the following structure is provided in order to easily prevent generation of abnormal noise in the attaching portion.

When the rubber 17 is loaded into the cup-shaped loading portion 16A of the upper spring seat 16, a protrusion 32 having a hemispherical shape, a spherical shape, a conical shape or the like is integrally formed at a plurality of circumferential positions on the upper end surface of the rubber 17. (FIG. 3A).
The rubber 17 has cutouts 33 at a plurality of other positions in the circumferential direction at the upper end face, which can accommodate the heads of the mounting bolts 20 attached to the vehicle body-side mounting portion 19 of the upper spring seat 16. Is provided with a seat portion 34 that can accommodate the upper end portion of the suspension spring 13.

The upper spring seat 16 is provided with holes 35 at a plurality of positions on the top surface in the circumferential direction, and the projections 32 of the rubber 17 are pushed into and fitted into the holes 35 under elastic deformation (FIG. 3 (B)). )). When the upper spring seat 16 is mounted on the vehicle body 1 by the mounting bolts 20 of the vehicle body-side mounting portion 19, the projections 32 of the rubber 17 protruding from the holes 35 of the upper spring seat 16 are compressed into the vehicle body 1 and fit into a circle. The concave recess 36 is inserted into the upper spring seat 1.
6 was provided around the hole 35 on the top surface.

According to this embodiment, the following operations are provided. When the upper spring seat 16 of the hydraulic shock absorber 10 is mounted on the vehicle body 1, the protrusion of the protrusion 32 of the rubber 17 held on the upper spring seat 16 with respect to the mounting surface 31 is compressed by the vehicle body 1 to form the concave portion 36. As a result, the natural frequency of the vehicle body 1 is substantially changed, and the generation of abnormal noise due to the resonance between the vehicle body 1 and the hydraulic shock absorber 10 is reduced. Can be prevented.

By adjusting the shape of the protrusion 32 of the rubber 17 held on the upper spring seat 16, the rubber capacity, the rubber hardness, the shape of the concave portion 36 provided on the upper spring seat 16, etc. Can be appropriately adjusted easily.

Since the mounting surface 31 of the upper spring seat 16 is firmly adhered to the vehicle body 1, there is no gap between the mounting surface 31 of the upper spring seat 16 and the vehicle body 1, and the upper spring seat 16 can oscillate. As a result, no abnormal noise is generated by hitting the vehicle body 1.

Since the rubber 17 held by the upper spring seat 16 is used to support the suspension spring 13, the structure is simpler than that using a rubber sheet and the like separate from the rubber 17. It is possible and the assemblability is good.

The rubber 17 is incorporated into the upper spring seat 16 by fitting the projection 32 of the rubber 17 into the hole 35 of the upper spring seat 16 and holding it. When assembling to the vessel 10, the rubber 17 does not fall off, and the assemblability of the hydraulic shock absorber 10 can be improved.

Since the projection 32 of the rubber 17 has a spherical or conical shape, the rubber 17 can be easily attached to the hole 35 of the upper spring seat 16.

Since the concave portion 36 provided on the top surface of the upper spring seat 16 is formed as a circular concave portion, the concave portion 36 is formed in a shape corresponding to the projecting portion 32, and the fitting of the projecting portion 32 into the concave portion 36 can be improved.

FIG. 4 shows the protrusion 41 of the rubber 17, the hole 42 and the recess 43 provided on the top surface of the upper spring seat 16. The protrusion 41 has a long shape in which a semicircular vertical section (or a triangular vertical section or the like) is continuous in the circumferential direction of the rubber 17, and a plurality of protrusions 41 are provided at a plurality of circumferential positions on the upper end surface of the rubber 17. Is provided. Upper spring seat 1
Numeral 6 is provided with long holes 42 at a plurality of positions on the top surface in the circumferential direction, and the projections 41 of the rubber 17 are pushed into and fitted into the long holes 42 under elastic deformation. When the upper spring seat 16 is mounted on the vehicle body 1 by the mounting bolts 20 of the vehicle body side mounting portion 19, the slots 4 of the upper spring seat 16
A long groove recessed recess 43 in which the protrusion 41 of the rubber 17 protruding from the second 2 is compressed and accommodated in the vehicle body 1 is provided around the long hole 42 on the top surface of the upper spring seat 16.
Since the protrusions 41 are continuous in the circumferential direction, the area of close contact with the vehicle body 1 increases, and the natural frequency of the vehicle body 1 can be easily changed.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific structure of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0033]

As described above, according to the present invention, the mounting surface of the upper spring seat of the hydraulic shock absorber can be firmly attached to the vehicle body in close contact with the vehicle body, and generation of abnormal noise in the mounting portion can be easily prevented. .

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic shock absorber.

FIG. 2 is a sectional view showing a mounting structure of the hydraulic shock absorber to a vehicle body.

FIG. 3 is a schematic diagram showing a protrusion of a rubber and a recess of an upper spring seat.

FIG. 4 is a schematic view showing a modified example of a rubber protrusion and a concave portion of an upper spring seat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 10 Hydraulic shock absorber 11 Damper tube 12 Piston rod 14 Lower spring seat 15, 17 Rubber 16 Upper spring seat 31 Mounting surface 32, 41 Projection 35, 42 Hole 36, 43 Recess

Claims (3)

[Claims] 1. A lower spring seat is provided on a damper tube, an upper spring seat is provided on a piston rod, a suspension spring is supported on upper and lower spring seats via rubber, and a mounting surface of a top surface portion of the upper spring seat is mounted on a vehicle body. When mounting the upper spring seat on the vehicle body, the protrusions of a plurality of rubbers are fitted and held in holes provided on the top surface of the upper spring seat. A mounting structure for a hydraulic shock absorber, characterized in that a recessed portion in which a rubber protrusion protruding from a hole of a spring seat is compressed and received in the vehicle body is provided around the hole on the top surface of the upper spring seat. 2. The hydraulic shock absorber mounting structure according to claim 1, wherein the rubber projection has a spherical shape, a conical shape, or a continuous shape having a circular vertical cross section. 3. The mounting structure for a hydraulic shock absorber according to claim 2, wherein the concave portion provided on the top surface portion of the upper spring seat is a circular or long groove-shaped concave portion.