JPH0510370A - Mount rubber structure - Google Patents

Abstract

PURPOSE:To absorb the vibration with a relatively high frequency and a small amplitude corresponding to the load noises and the like inputted from the wheel side by elastically holding the upper end section of the piston rod of a damper constituting a shock absorber on an elastic body. CONSTITUTION:A ring-shaped elastic body 23 with a nearly U-shaped cross section is held on an upper coil sheet 12 connected to a vehicle body. A plate member 25 fixed to the upper end section of the piston rod 10b of a damper constituting a shock absorber is elastically held between the upper face section 23a and the lower face section 23b of the elastic body 23. An upper liquid chamber 26 and a lower liquid chamber 27 increased or decreased with the volume when the plate member 25 is brought into contact with the upper face section 23a or the lower face section 23b of the elastic body 23 are provided, and an orifice 29 circulating the sealed liquid between the liquid chambers 26, 27 is provided. The vibration with a relatively high frequency and a small amplitude can be effectively absorbed by the elastic body 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount rubber, and more particularly to a structure of a mount rubber used for attaching a top end portion of a shock absorber constituting a vehicle suspension device to a vehicle body.

[0002]

2. Description of the Related Art Generally, a shock absorber which constitutes a suspension system of an automobile has a coil spring arranged concentrically outside a damper to which wheels are connected at a lower end thereof, and an upper end portion of a piston rod of the damper. The upper coil seat is provided so as to receive the upper end portion of the coil spring, and the upper coil seat is attached to the vehicle body to connect the wheels to the vehicle body.

In recent years, in addition to absorbing and damping the vibration by the shock absorber, the transmission of the vibration from the wheel side to the vehicle body side is also suppressed by the mount portion of the upper coil seat on the vehicle body. Has been carried out, and an example thereof is disclosed in Japanese Patent Application Laid-Open No. 2-275130. What is disclosed in this publication is that an elastic body is interposed between an outer cylinder fitting attached to a vehicle body and an inner cylinder fitting to which an upper end portion of a piston rod of a damper is connected, and It is equipped with a damping mechanism that uses an incompressible fluid.
It is possible to reduce the dynamic spring constant in the high frequency range without significantly reducing the static spring constant. As a result, while ensuring good steering stability of the vehicle, the body of high frequency vibration equivalent to road noise etc. It is said that it will be possible to effectively suppress the transmission to the.

By the way, as described above, when an elastic body is used for the mount portion of the upper end of the shock absorber to the vehicle body to suppress the transmission of vibration, when rolling or sudden braking or sudden start during turning. When a large load is applied to the mount part due to a change in the posture of the vehicle body such as pitching on the vehicle or bounce due to unevenness of the traveling road surface, the elastic body is greatly deformed and the vehicle body posture becomes unstable, which leads to stable steering. Sex will deteriorate.

To solve this problem, a stopper mechanism may be provided on the mount portion. This stopper mechanism
For example, a stopper plate is attached to the upper end of the piston rod of the damper, and when a relative displacement of a predetermined amount or more occurs between the upper end of the piston rod and the upper coil seat attached to the vehicle body, the stopper plate is attached to the upper plate. By contacting the coil sheet, this relative displacement is configured to be regulated by a predetermined amount,
According to this, it is possible to reliably receive a large load due to a change in the vehicle body posture such as the above-mentioned rolling, and to secure good steering stability.

[0006]

However, as described above, when an elastic body is used for the mount portion at the upper end of the shock absorber and the displacement of the elastic body is restricted by a predetermined amount by the stopper mechanism, The following problems occur.

That is, when a large load is applied to the mount portion due to rolling of the vehicle body or the like, the stopper member on the piston rod side and the upper coil seat on the vehicle body collide violently, so-called stopper shock occurs. As a reaction to the shock, a vibration having a relatively large amplitude is generated, which is transmitted to the vehicle body. In order to reduce the stopper shock, the spring constant of the elastic body may be increased so that the elastic body itself bears the load acting on the mount portion as much as possible.
With this, it becomes impossible to effectively absorb the vibration having a relatively small amplitude corresponding to road noise or the like during normal traveling.

Therefore, the present invention effectively suppresses the transmission of vibrations corresponding to road noise from the wheel side to the vehicle body, while alleviating the stopper shock due to a large load during rolling of the vehicle body, and An object is to realize a mount structure that can quickly damp the vibrations associated with this shock.

[0009]

In order to solve the above problems, the mount rubber structure according to the present invention is characterized in that it is constructed as follows.

That is, in the mount portion for supporting the upper end portion of the shock absorber composed of the damper and the coil spring on the vehicle body, the upper coil sheet which receives the upper end portion of the coil spring and is coupled to the vehicle body, and the upper coil sheet are held by the upper coil sheet. A ring-shaped elastic body having a substantially U-shaped cross section, and a plate member fixed to the upper end of the piston rod of the damper and elastically held between the upper surface and the lower surface of the elastic body. The plate member is configured to contact the upper surface portion or the lower surface portion of the elastic body when the upper coil sheet and the piston rod are relatively displaced in the vertical direction by a predetermined amount or more. Then, a pair of liquid chambers whose volume is increased or decreased by abutting the plate member on the upper surface portion or the lower surface portion of the elastic body are provided on the upper and lower portions of the elastic body,
Further, it is characterized in that these liquid chambers are communicated with each other to form an orifice for allowing the enclosed liquid to flow between the liquid chambers when the volume of the liquid chambers is increased or decreased.

[0011]

According to the above construction, the plate member fixed to the upper end of the piston rod of the damper constituting the shock absorber is elastically held by the elastic body attached to the upper coil sheet. Vibrations of relatively high frequency and small amplitude, which correspond to road noise and the like input from the wheel side connected to the lower end of the shock absorber, are effectively absorbed by the elastic body, and its transmission to the vehicle body side is suppressed. Will be.

Further, when a large load acts on the mount portion due to a change in the posture of the vehicle body such as rolling, pitching or bounce, the plate member comes into contact with the upper surface portion or the lower surface portion of the elastic body, By restricting the vertical displacement of the plate member and the upper coil sheet fixed to the vehicle body in the vertical direction by a predetermined amount, a large change in the vehicle body posture can be prevented. Then, at this time, the volumes of the pair of liquid chambers respectively provided on the upper and lower portions of the elastic body increase and decrease, and the sealed liquid flows from one liquid chamber to the other liquid chamber through the orifice. Due to the flow resistance due to the viscosity of the liquid, the stopper shock when the plate member comes into contact with the upper surface portion or the lower surface portion of the elastic body is alleviated. Further, the vibration having a relatively large amplitude generated as a reaction of this contact is rapidly attenuated by the flow resistance of the enclosed liquid.

[0013]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 shows an example of an automobile suspension device to which the mount structure according to this embodiment is applied. The suspension device 1 includes first and second upper arms 2 and 3, and a first upper arm 2 and a third upper arm 2. , The second lower arms 4 and 5,
The shock absorber 6 and the first,
The second upper arms 2, 3 and the first, second lower arms 4,
5, a wheel support member 8 that rotatably supports the wheel 7 is swingably connected to the vehicle body frame 9.

On the other hand, the shock absorber 6 includes a damper 10 and a coil spring 11 arranged coaxially outside the damper 10.
The lower coil portion of the cylinder 10a in the damper 10 is connected to the first lower arm 4 and the upper coil seat 12 provided on the upper end portion of the piston rod 10b protruding upward from the cylinder 10a is It is connected to a member 13 forming a so-called suspension tower. Further, the coil spring 11 has an upper end on the upper coil sheet 12 and a lower end on the damper 10.
The lower coil sheets 14 fixed to the cylinders 10a are received respectively. And this coil spring 11
With the damper 10, the vibration between the wheel 7 and the vehicle body is absorbed and damped.

Further, the upper coil sheet 12 is provided with a mounting device 20 having a vibration absorbing function, and the upper end portion of the piston rod 10b of the damper 10 is connected to the mounting device 20.
This upper coil sheet 12 or mounting device 20
The structure of is explained.

As shown in FIGS. 2 and 3, the upper coil sheet 12 is formed by stacking two sheets of an upper plate 12a and a lower plate 12b, and the lower plate 12b receives the upper end portion of the coil spring 11 and the upper plate 12a. Is attached to the vehicle body member 13 with a plurality of bolts 15. And both plates 1
Circular swelling portions 12a ′, 12 swelling upward and downward at the central portions of 2a, 12b and having central openings
b'are respectively provided and these bulges 12a ', 1
The mount device 20 is held between 2b '.

This mounting device 20 has a cylindrical case 21 having an upper surface and a lower surface opened at the center thereof, a sealing member 22 made of a thin elastic material disposed along the inner surface thereof, and the sealing member 22 interposed therebetween. And a ring-shaped elastic body 23 having a substantially U-shaped cross section fitted in the case 21.
Then, the upper surface portion 23a and the lower surface portion 23b of the elastic body 23
A protruding portion 23c protruding inward in a ring shape is provided in the middle of the above, and a circumferential groove 23d provided on the inner periphery of the protruding portion 23c is provided with a nut at the upper end portion of the piston rod 10b of the damper 10. The peripheral edge of the circular plate member 25 fixed by using 24 is engaged, so that the upper end of the piston rod 10b is elastically held by the projecting portion 23c of the elastic body 23 via the plate member 25. There is.

The upper and lower surfaces of the elastic body 23,
An upper liquid chamber 26 and a lower liquid chamber 27 are provided between the upper surface portion and the lower surface portion of the sealing member 22, respectively, and metal ring members are provided on the inner peripheral edges of the upper and lower surfaces of the elastic body 23. 28 and 28 are fixed to each other, the ring members 28 and 28 are pressed against the upper surface portion and the lower surface portion of the seal member 22, respectively, and the outer peripheral surface of the elastic body 23 is pressed against the peripheral surface portion of the seal member 22 from the inside. As a result, the upper and lower liquid chambers 26 and 27 are sealed from the outside. A liquid is sealed in the liquid chambers 26 and 27, and an orifice having a small cross-sectional area is formed on the outer peripheral surface of the elastic body 23 so as to extend in the vertical direction and connect the upper and lower liquid chambers 26 and 27. 29 is provided, and these constitute a vibration damping mechanism.

In the illustrated embodiment, the case 21 and the seal member 22 provided on the inner surface of the case 21 are divided into two parts on the left and right sides in the drawing in order to secure a required assembling property. Further, the elastic body 23 may be divided into right and left. Further, the upper liquid chamber 26, the lower liquid chamber 27, and the both liquid chambers 26, 27
Two sets of vibration damping mechanisms, which are the orifices 29 between, are provided on the left and right, but one set or three or more sets may be provided.

Next, the operation of this embodiment will be described. The upper end portion of the piston rod 10b of the damper 10 constituting the shock absorber 6 is mounted on the upper coil seat 12 connected to the vehicle body member 13 via the mounting device 20. Therefore, the vibration from the wheel 7 side is input to the mount device 20 via the wheel support member 8, the first lower arm 4 and the damper 10.

In this case, in the mounting device 20, the peripheral edge of the plate member 25 fixed to the upper end of the piston rod 10b has the upper plate 12a of the upper coil sheet 12 and the lower plate 12b.
Since the elastic member 23 is elastically held by the protruding portion 23c of the elastic member 23, the vibration from the wheel 7 side causes the protruding portion 23c of the elastic member 23 as shown by the chain line in FIG. Will be absorbed by the elastic deformation in. As a result, the transmission of vibration having a relatively high frequency and a small amplitude, such as road noise, from the upper coil seat 12 to the vehicle body member 13 side is suppressed.

On the other hand, when the posture of the vehicle body changes due to rolling during turning, sudden braking, sudden start, etc., and bounce due to irregularities on the road surface, the mounting device 20 is A large vertical load acts on the upper coil sheet 12
On the other hand, the plate member 25 at the upper end of the piston rod 10b is relatively displaced in the vertical direction. At this time, as shown by the chain line in FIG. 5, the protruding portion 23c of the elastic body 23 holding the peripheral edge portion of the plate member 25 contacts the lower surface of the upper surface portion 23a of the elastic body 23 or the upper surface of the lower surface portion 23b. Thus, the relative displacement of the plate member 25 or the piston rod 10b with respect to the upper coil sheet 12 is regulated by a predetermined amount. As a result, the change in the vehicle body posture as described above is suppressed, the posture of the vehicle body is stabilized, and the steering stability of the vehicle is improved.

When the projecting portion 23c of the elastic body 23 holding the peripheral portion of the plate member 25 contacts the upper surface portion 23a or the lower surface portion 23b of the elastic body 23 as described above, for example, a chain line in FIG. As shown in FIG. 3, when the upper surface 23a is abutted, the volume of the upper liquid chamber 26 decreases and the volume of the lower liquid chamber 27 increases due to the deformation of the elastic body 23. The enclosed liquid flows into the lower liquid chamber 27 through the orifice 29, and conversely, the protrusion 2
When 3c contacts the lower surface portion 23b, the lower liquid chamber 27
And the volume of the upper liquid chamber 26 increases, the enclosed liquid flows from the lower liquid chamber 27 to the upper liquid chamber 26 through the orifice 29. Then, due to the flow resistance of the liquid at that time, the stopper shock due to the contact of the protruding portion 23c with the upper surface portion 23a or the lower surface portion 23b is alleviated, and the vibration of a relatively large amplitude generated as a reaction of this contact is generated. However, the flow resistance of the enclosed liquid is quickly attenuated.

[0025]

As described above, according to the present invention, an elastic body is used for the mount portion on the vehicle body at the upper end portion of the shock absorber constituting the suspension device, and the mount portion is provided with a stopper function to provide the elasticity. In the one in which the vertical displacement of the body is regulated by a predetermined amount, the upper end of the piston rod of the damper forming the shock absorber is elastically held by the elastic body, so that the load input from the wheel side is applied. Vibration having a relatively high frequency and a small amplitude, which corresponds to noise or the like, is effectively absorbed by the elastic body. Further, when a large load is applied to the mount portion due to a change in the vehicle body posture such as rolling, pitching, or bounce, the stopper function prevents a large change in the vehicle body posture, and a stopper shock at that time is generated. Vibrations which are alleviated and of relatively large amplitude thereafter will be quickly damped.
In this way, vibrations and shocks of different properties are effectively absorbed, dampened or alleviated, and a vehicle with excellent riding comfort is realized in combination with the action of the shock absorber. ..

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a suspension device in which the present invention is implemented.

FIG. 2 is a vertical sectional view of a mounting device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the mounting apparatus taken along the line AA in FIG.

FIG. 4 is a partially enlarged view showing one working state of the mounting apparatus.

FIG. 5 is a partially enlarged view showing another working state of the mounting apparatus.

[Explanation of symbols]

 6 Shock Absorber 10 Damper 10b Piston Rod 11 Coil Spring 12 Upper Coil Sheet 20 Mounting Device 23 Elastic Body 25 Plate Member 26, 27 Liquid Chamber 29 Orifice

Front page continued (72) Inventor Fumitaka Ando 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Takeshi Edahiro 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture (72) ) Inventor Shigefumi Hirabayashi 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (1)

Claim: What is claimed is: 1. A structure of a mount rubber for supporting an upper end portion of a shock absorber composed of a damper and a coil spring on a vehicle body, the upper member being configured to receive the upper end portion of the coil spring and be coupled to the vehicle body. Between the coil sheet, the ring-shaped elastic body having a substantially U-shaped cross section held by the upper coil sheet, and between the upper surface and the lower surface of the elastic body fixed to the upper end of the piston rod of the damper. A plate member which is elastically held and which abuts on the upper surface portion or the lower surface portion of the elastic body when the upper coil sheet and the piston rod are relatively displaced in the vertical direction by a predetermined amount or more, and the upper portion of the elastic body and The lower part is provided with a pair of liquid chambers whose volume is increased or decreased by the contact of the plate member with the upper surface or the lower surface of the elastic body, and these liquid chambers are connected. It is allowed to mount rubber structure, characterized in that the formation of the orifice for flowing the sealed fluid between the two fluid chambers when increase and decrease of its volume.