JPH094673A - Strut mount - Google Patents

Abstract

PURPOSE: To prevent the occurrence of abnormal sounds and ensure the comfortable riding quality by forming the abutment surface of the elastic member abutting against the regulating member into a rough surface and restraining the absorption of an elastic member to a restraining member. CONSTITUTION: An abutment part 17 is disposed to oppose through a fine gap to a stopper part 13 and regulate the excessive deformation of an elastic member 12 in the vibration input by the abutment of the abutment part 17 against the stopper part 17. The elastic member 12 fixed through an inside member 10 to a piston rod receives vibration, the abutment part 17 formed in the elastic member 12 abuts against the stopper part 13 and, the abutment part 17 is operated to part from the stopper part 13. When the abutment part 17 parts from the stopper part 13, the surface of the abutment part 17 is formed into a rough surface, so that the abutment part 17 is restrained from adhesion to the stopper part 13 and the occurrence of abnormal sounds can be prevented. The rough surface of the abutment part 17, i.e., the surface formed with fine irregularities is set to have 50-150μm of the range of irregularities preferably for preventing the occurrence of abnormal sounds.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strut mount provided between a piston rod of a shock absorber and a vehicle body in a vehicle suspension system.

[0002]

2. Description of the Related Art A conventionally known vehicle suspension system for an automobile or the like is shown in FIG. In this vehicle suspension system, an axle 2 that rotatably supports a wheel 1
Is attached to a spindle 3, and the spindle 3 is attached to a vehicle body 5 via an arm mechanism 4. A shock absorber 6 composed of a piston and a cylinder is connected to the spindle 3 on the outer tube 7 side,
The end of the piston rod 8 is a strut mount 100
It can be attached to the vehicle body 5 via. Further, a coil spring 9 is arranged on the outer circumference of the shock absorber 6 so that the shock absorber 6 and the coil spring 9 do not transmit vibrations from the road surface to the vehicle body 5.

Here, the conventional strut mount 100
As shown in FIG. 5, a cylindrical inner member 101 connected to the end of the piston rod 8 of the shock absorber 6 and an outer member 102 arranged outside the inner member 101 and attached to the vehicle body 5. , These inner member 101 and outer member 102
And a rubber elastic member 103 disposed between the shock absorber 6 and the coil spring 9 to absorb vibrations from the wheels that cannot be absorbed by the shock absorber 6 and the coil spring 9 and prevent the vibrations from being transmitted to the vehicle body. There is.

The inner member 101 is formed by integrally connecting a metal cylinder 105 and a seat plate 106, and the tip portion of the piston rod 8 is inserted into the cylinder 105 so that the nut 1
The strut mount 100 is connected to the shock absorber 6 by being tightened at 07. Outer member 102
Is an annular metal housing that houses and holds the elastic member 103 therein.
8, 109 are opposed to each other and fixed to each other. Each of the hat-shaped members 108 and 109 includes cylindrical portions 108A and 109A having a circular cross section, and cylindrical portions 108A and 109A.
The stopper portion 10 extends radially inward at one end of A.
4 annular annular inner flange portions 108B, 109B
And the outer flange portion 1 for fixing to the vehicle body 5 extending radially outward at the other ends of the tubular portions 108A and 109A.
It consists of 08C and 109C. A plurality of bolts 110 that pass through the outer flanges 108C and 109C are planted in the outer flanges 108C and 109C, and the strut mount 100 is attached to the vehicle body 5 by the bolts 110. The elastic member 103 is vulcanized and adhered to the outside of the inner member 101 by a normal rubber vulcanization molding method, and is fixed to the inside of the outer member 102 by fitting or adhesion. Thereby, the elastic member 103 connects the inner member 101 and the outer member 102. Further, the upper and lower end surfaces of the elastic member 103 function as contact portions that can contact the stopper portion 104, and are arranged so as to face the stopper portion 104 with a minute gap,
Alternatively, it is brought into contact with the stopper 104 in advance. When the vibration is input, the contact between the end surface and the stopper 104 prevents the elastic member 103 itself from excessively deforming.

[0005]

By the way, when the vibration is transmitted from the piston rod 8, the end faces of the elastic member 103 come into contact with the stopper portions 104 arranged opposite to each other to prevent the elastic member 103 from being excessively deformed. , Then stopper 1
Away from 04. Further, in the case where the end surface of the elastic member 103 is abutted on the stopper portion 104 in advance, when one of both end surfaces of the elastic member 103 is pressed by the stopper portion 104, the other end surface of the elastic member 103 is pushed to the stopper portion 104. When the input vibration is large, the other end face and the stopper portion 104 are separated from each other. Become. And in this way the end face and the stopper portion 1
There is a problem that abnormal noise is generated due to the adhesiveness of the rubber-like elastic body when it is separated from 04. The generation of this abnormal noise is very uncomfortable for passengers.

An object of the present invention is to solve the above problems of the prior art, and it is an object of the present invention to provide a strut mount capable of preventing generation of abnormal noise and ensuring a comfortable riding comfort.

[0007]

SUMMARY OF THE INVENTION The present invention is a cylindrical inner member connected to the end of a piston rod of a shock absorber in a suspension system, and is concentrically arranged so as to surround the inner member. And an outer member attached to the vehicle body side, and a rubber-like elastic member interposed between the inner member and the outer member. The elastic member regulates axial deformation of the elastic member. The strut mount is provided with an abutting portion that comes into contact with a regulating member for performing the operation, and the surface of the abutting portion is formed into a rough surface.

Further, it is preferable that the difference between the concavities and convexities formed on the surface of the contact portion is set in the range of 50 to 150 μm.

[0009]

According to the above construction of the present invention, since the surface of the contact portion of the elastic member which comes into contact with the regulating member is formed to be a rough surface, adsorption to the regulating member can be suppressed and generation of abnormal noise can be prevented. A comfortable ride can be secured.

Further, when the difference between the irregularities formed on the surface of the contact portion is set in the range of 50 to 150 μm, the generation of abnormal noise can be suppressed significantly. If the difference in the unevenness is less than 50 μm, it is difficult to suppress the generation of abnormal noise, and if the difference in the unevenness is greater than 150 μm, the convex portion is damaged and comes off due to the contact with the regulating member, and the generation of the abnormal noise cannot be suppressed. There is a fear.

[0011]

EXAMPLES Hereinafter, more specific examples will be described.

Referring to FIG. 1, a tubular inner member 10 connected to an end of a piston rod of a shock absorber similar to the conventional one,
An outer member 11 disposed outside the inner member and attached to the vehicle body, an elastic member 12 made of rubber disposed between the inner member 10 and the outer member 11, and an elastic member 12 in the axial direction. A stopper portion 13 as a regulating member is provided on both end sides in the axial direction so as to regulate the deformation.

The inner member 10 is formed of a metal and has a flat bottomed cylindrical shape, and the opening 10A side is bent radially inward to form an annular inner flange portion 10B. Further, a hole 10D into which the piston rod is inserted is formed in the bottom surface 10C, and one end of the piston rod is inserted into the inside member 10 through the hole 10D to form the opening 10A.
The piston rod is fixed to the inner member 10 from the above position via a fastener such as a bolt.

The outer member 11 is an annular metal housing for accommodating and holding the elastic member 12, and two hat-shaped members 15 and 16 are opposed to each other and fixed to each other. Each of the hat-shaped members 15 and 16 includes a tubular portion 15A, 16A having a circular cross section, and the tubular portion 15A, 1A.
Stopper portion 1 extending inward in the radial direction at one end of 6A
It is composed of annular inner flange portions 15B, 16B which are 3 and outer flanges 15C, 16C for fixing to the vehicle body extending outward in the radial direction at the other ends of the tubular portions 15A, 16A. And this outer flange 15C, 16
The C is attached to the vehicle body by several bolts (not shown) inserted between the two.

The elastic member 12 is vulcanized and bonded between the outside of the inner member 10 and the outer cylinder 14 by a normal rubber vulcanization molding method, and the outer cylinder 14 is fitted or adhered to the inside of the outer member 11. Fixed. Thereby, the elastic member 12 connects the inner member 10 and the outer member 11. In addition,
As the rubber material of the elastic member 12, a known rubber material such as natural rubber, butadiene rubber, styrene-butadiene rubber, or a mixed rubber thereof is used. In this example, 40 parts by weight of natural rubber and 60 parts by weight of styrene-butadiene rubber are used. Mixed rubber with is used.

Further, the upper and lower end surfaces of the elastic member 12 are abutting portions 17 capable of abutting on the stopper portion 13, and in the present example, have a triangular cross-section. The abutting portion 17 is arranged so as to face the stopper portion 13 with a minute gap, and when the vibration is input, the abutting portion 15 and the stopper portion 13 come into contact with each other so that the elastic member 12 is excessively deformed. Are regulated. The contact portion 17 has a surface roughness Ry (JIS B060
In 1), it is formed on a rough surface having an uneven shape of 100 μm. Such a rough surface may be formed in advance by electrical discharge machining or the like on the surface of the rubber mold when the elastic member 12 is molded.
It can be easily formed by roughening with unevenness of μm, and this is easier and more cost effective than roughening the surface of the stopper portion 13 made of a metal plate.

Next, the operation of this embodiment will be described.
That is, when the vibration is transmitted from the piston rod (not shown), the elastic member 12 fixed to the piston rod through the inner member 10 receives the vibration, and the contact portion 17 formed on the elastic member 12 stops. Abutting on the part 13, the abutting part 17 then operates to separate from the stopper part 13.
When the contact portion 17 and the stopper portion 13 are separated from each other, the surface of the contact portion 17 is formed as a rough surface, so that the contact portion 17 is prevented from adhering to the stopper portion 13 and an abnormal noise is generated. Prevent occurrence.

When the abutting portion 17 and the stopper portion 13 come into contact with each other, the abnormal sound is brought into close contact with the surface of the abutting portion 17 and the surface of the stopper portion 13 due to the adhesiveness inherent to the rubber forming the elastic member 12. It is thought that this is a sound generated when the two are separated from each other, and the surface of the contact portion 17 is a rough surface as described above.
The contact portion 17 is prevented from coming into close contact with the stopper portion 13 to prevent generation of abnormal noise. Further, at this time, the rough surface of the contact portion 17, that is, the uneven surface formed minutely, has a difference in unevenness set in the range of 50 to 150 μm, which is suitable for preventing generation of abnormal noise. . If the unevenness difference is less than 50 μm, the gap due to the recessed portion may disappear due to elastic deformation at the time of contact, and the surface of the contact portion 17 may adhere to the stopper portion 13, and if the unevenness difference is greater than 150 μm, That is, if the convex portion projects more than 150 μm, the convex portion may be damaged by contact with the stopper portion 13 and may be broken and fall off, so that there is no unevenness and the desired effect may not be obtained.

2 and 3 are for showing another embodiment of the present invention, and FIG. 3 shows a state in which the outer member is removed. The same components as those in the embodiment of FIG. 1 will be described with the same reference numerals. according to this,
The elastic member 12 has a plurality of convex portions 18 formed as contact portions on the axial end surface. A plurality of convex portions 18 are continuously formed on the circumference of both end surfaces of the elastic member 12, as shown in FIG.
In, four convex-shaped portions 18 are formed on each end face. Each convex portion 18 has a gentle inclined surface 18A on both sides of the apex, and the inclined portions 18A are connected at the lower end portion so that each convex portion 18 is continuous on the circumference. The convex portion 18 has an inclined surface 18 from its top.
Similar to the embodiment of FIG. 1, the surface is formed to be a rough surface, that is, an uneven surface having a difference in unevenness of 50 to 150 μm, thereby suppressing the adhesion of the convex portion 18 to the stopper portion 13. It

As described above, this embodiment has substantially the same operational effect as that of the embodiment of FIG. 1, and the convex portion 18 forming the contact portion is inclined with the apex portion interposed therebetween. Since the surface 18 </ b> A is provided, the contact area gradually increases from the apex at the time of contact with the stopper portion 13, the spring characteristics change gently and hard, and the riding comfort becomes better.

In the above-mentioned two embodiments, the abutting portion is opposed to the regulating member with a gap, but the abutting portion is abutted on the regulating member in advance and the elastic member main body is input at the time of vibration input. It is also possible to adopt a configuration in which vibration is suppressed by the presence of this contact portion between the control member and the regulating member. In this case, there is no impact when abutting from the separated state, and the spring constant does not rise sharply. Further, the shape of the contact portion is not limited to those of the above-described two embodiments, and for example, the end surface itself of the cylindrical elastic member, that is, the annular flat surface portion may be configured as the contact portion.

Further, the outer cylinder 14 may be combined with the outer member 11 if necessary by directly bonding the elastic member 12 to the outer member 11 by vulcanization. Furthermore, the stopper portion 13 does not have to be formed integrally with the outer member 11, and may be configured as a member other than this, for example, as a spring seat metal fitting of the suspension device. Further, instead of the structure in which the contact portion and the regulating member are in contact with each other at both end surfaces of the elastic member, only one end surface side may be provided. In this case, the other surface side is preferably fixed by vulcanization adhesion or the like.

[0023]

As described above, the present invention can provide the strut mount which can prevent the generation of abnormal noise and ensure a comfortable riding comfort due to the structure described in the claims.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a partial perspective view showing a main part of another embodiment of the present invention.

FIG. 4 is a schematic front view of a suspension device equipped with a conventional strut mount.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 10 Inner Member 11 Outer Member 12 Elastic Member 13 Stopper Part (Regulating Member) 17 Abutting Part 18 Convex Shaped Part (Abutting Part)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F16F 15/08 8917-3J F16F 15/08 Q

Claims (2)

[Claims] 1. A tubular inner member connected to an end portion of a piston rod of a shock absorber in a suspension system, and an outer member concentrically arranged so as to surround the inner member and attached to a vehicle body side. And a rubber-like elastic member interposed between the inner member and the outer member, the strut mount including: an elastic member for restricting axial deformation of the elastic member. The strut mount is characterized in that an abutting portion that abuts against the regulating member is provided and a surface of the abutting portion is formed into a rough surface. 2. The strut mount according to claim 1, wherein the difference between the irregularities formed on the surface of the contact portion is set in the range of 50 to 150 μm.