JPH10132013A - Damper mount for suspension of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a damper mount for the suspension of a vehicle in such a way as by a simple structure, the isolation capacity for microvibration or noise is increased without impairing the damping response capacity of the damper. SOLUTION: The structure of a damper mount for a suspension of an automobile is such that a pair of rubber bushes 5 and 6 which are individually held by holding members 3 and 4 which has a general cup shape and a hole in bottom wall are mounted on a shaft part 2 of a damper, and the pair of rubber bushes 5 and 6 pinch a car body from upper and lower sides to couple the shaft part 2 of the damper with the car body. With respect to a shaft part insertion hole 9 punched in the car body, a gap is provided between the car body and the inner circumferential surface of the insertion hole 9 to insert the shaft part 2, the pair of holding members 3 and 4 are installed on the shaft part 2 with their both opening faces facing to the mounting face side of the car body, the outer surface of the bottom wall of one of the holding members 3 and 4 is fixed to the car body, the other holding member is fixed to the shaft part 2 in the same direction as one holding member, and at least the spring rigidity relative to the radial load of the rubber bushes held by one of the holding members is set low compared with the other rubber bush. Thus, an optimum tuning of the spring rigidity of the coupling part between a damper rod and the car body becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper mount for a vehicle suspension system provided with a rubber bush.

[0002]

2. Description of the Related Art A suspension system for an automobile is combined with a spring for receiving an impact load acting between a wheel and a vehicle body and a damper (shock absorber) for damping the vibration of the spring. However, from the viewpoint of the damping response of the damper, it is preferable that the connection rigidity between the damper and the vehicle body is high, and the connection rigidity is rather low in order to cut off micro vibration and noise and to reduce the sliding resistance of the damper. Is preferred.

[0003] As an example of a technique for satisfying such contradictory demands, a rubber bush is interposed at a connection portion between a damper and a vehicle body, an axial load is received by a compression resistance of the rubber bush, and a radial load is applied to the rubber bush. It is known that the shear resistance is applied.

[0004]

However, according to this known construction, desired characteristics can be obtained by setting the spring stiffness in the axial direction and the spring stiffness in the radial direction, but the cross-sectional shape becomes complicated. In addition, the production cost tends to increase.

The present invention has been devised in order to solve such problems imposed on the prior art, and its main object is to provide a simple structure without impairing the damping response of the damper. It is an object of the present invention to provide a damper mount for a vehicle suspension system which is improved so as to be able to enhance the isolation of microvibration and noise.

[0006]

In order to achieve the above object, according to the present invention, there is provided a pair of rubber bushes each having a generally bowl shape and individually held by a holding member having a hole in a bottom wall. The damper mount of the suspension system for the vehicle, in which the shaft of the damper is connected to the vehicle body by sandwiching the vehicle body from above and below with the pair of rubber bushes, is established on the vehicle body. A shaft is inserted into the shaft insertion hole with a gap formed between the shaft insertion hole and the inner peripheral surface of the insertion hole, and the pair of holding members are pivoted with their open surfaces facing the vehicle body mounting surface. It was made to attach to the part. Thus, the axial load can be received by the compression resistance of the rubber bush, and the radial load can be received by the shear resistance of the rubber bush, so that only the compliance with respect to the radial load can be easily increased. As another approach,
One bottom wall outer surface of the pair of holding members is fixed to the vehicle body, and the other is fixed to the shaft in the same direction as the one, and the rubber bush held by the one holding member at least against radial load. The spring stiffness is set lower than the other rubber bush. As a result, the axial load is received by the compression resistance of the two rubber bushes, and the radial load is received by the compression resistance of the rubber bush having relatively low spring stiffness on the side where the holding member is fixed to the vehicle body, and the other rubber bush. Since the shear resistance can be applied, only the compliance with respect to the radial load can be easily increased.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a damper mount of a double wishbone type suspension constructed according to the present invention. The damper mount 1 is provided at a connecting portion between a piston rod 2 of a hydraulic damper (shock absorber) and a vehicle body. The damper mount 1 has a generally bowl-like shape and is individually provided by holding members 3 and 4 having holes in a bottom wall. A pair of rubber bushings 5 and 6 held on the end of the piston rod 2 are externally provided, and a pair of rubber bushes 5.6 and 6 sandwich the sheet metal of a mount bracket 7 provided on the vehicle body from above and below, so that the rubber is provided. The piston rod 2 is connected to the mount bracket 7 (vehicle body) via the elasticity of the bushes 5 and 6.

The bowl-shaped holding members 3 and 4 are mounted on the upper rubber bush 5 from the upper side and on the lower rubber bush 6 from the lower side.
Each is attached to the end of the piston rod 2 toward the side. A pipe-shaped collar 8 is mounted between the two holding members in order to define the axial dimension between them and to define the initial deformation amount of the rubber bushes 5 and 6.

The mount bracket 7 is provided with an insertion hole 9 through which the end of the piston rod 2 is inserted. The insertion hole 9 has a gap between its inner periphery and the outer periphery of the piston rod 2. As such, it is slightly larger.

In the case of a double wishbone type suspension, the movement of the axle is regulated by the upper and lower arms.
Since the angle of the axis of the damper changes with the vertical movement of the wheel, this acts as a radial load on the piston rod 2. According to the configuration of the present embodiment, the mounting bracket 7
Since the piston rod 2 is inserted through the insertion hole 9 with a gap between the piston rod 2 and the end of the piston rod 2, when a radial load is applied, the contact surfaces of the rubber bushes 5 and 6 with the mount bracket 7 Although not displaced by frictional force, the piston rod 2 is displaced somewhat in the radial direction inside the insertion hole 9. Therefore, a shearing force is generated in a portion between the open surfaces of the holding members 3 and 4 and the contact surface with the mount bracket 7 in the rubber bushes 5 and 6. Providing the rubber bushings 5 and 6 with the portions that receive the shear load in this manner enables the spring stiffness of the connecting portion between the piston rod 2 and the mount bracket 7 to be optimally tuned. In particular, since the high-frequency components of vibration can be absorbed by the shear resistance of the rubber bushes 5 and 6 to reduce the amount of transmission to the vehicle body, the sound insulation can be improved.

FIG. 2 shows a second embodiment of the connecting portion of the damper with the vehicle body. Also in this case, the bowl-shaped holding member 23
A pair of rubber bushes 25 individually held at 24
26 is mounted on the end of the piston rod 22, and the piston rod 22 is connected to the mount bracket 27 (vehicle body) by sandwiching the mount bracket 27 between the pair of rubber bushes 25 and 26 from above and below. The fact that the piston rod 22 is loosely inserted into the hole 29 and that the pipe-shaped collar 28 is mounted between the holding members 23 and 24 is the same as in the first embodiment. In the second embodiment, the upper holding member 2
3 has a bottom wall fixed to the end of the piston rod 22 with the open surface facing downward as in the first embodiment.
The lower holding member 25 has the open surface facing downward (that is, the directions of both holding members are the same).
7 has a bottom wall fixed thereto, and a washer 20 is applied to a lower surface of a rubber bush 26 held by the bottom wall.

The pair of rubber bushes 25 and 26 has lower spring stiffness, that is, the rubber stiffness of the rubber bush 26 held by the holding member 24 fixed to the mount bracket 27, as compared with the upper rubber bush 25. It is set low, that is, soft. Therefore, the lower rubber bush 26 is easier to bend than the upper rubber bush 25.

According to this, the upper rubber bush 25
Is not fixed to the upper surface of the mounting bracket 27, the upper rubber bush 25 receives an axial compressive load, and
It only stops receiving the shearing load due to the frictional force generated on the contact surface between the rubber bush 25 and the rubber bush 25. The lower rubber bush 26 receives a compressive load in both the axial load and the radial load. In this case, by setting the spring stiffness of the lower rubber bush 26 receiving the radial compressive load to be low, the compliance of the rubber bush as a whole with respect to the radial load is increased. Is reduced, and an improvement in sound insulation is obtained.

FIG. 3 shows a third embodiment of the present invention. Also in this case, the pair of rubber bushes 35 and 36 individually held by the bowl-shaped holding members 33 and 34 are provided on the ends of the piston rod 32, and the mount bracket 37 is fixed to the pair of rubber bushes 35 and 36. The piston rod 32 is connected to the mount bracket 37 (vehicle body) by being sandwiched from above and below, the piston rod 32 is loosely inserted into the insertion hole 39 of the mount bracket 37, and a pipe-shaped member is provided between the holding members 33 and 34. The fact that the collar 38 is mounted is the same as in the first embodiment. In the present embodiment, the lower holding member 34 has a bottom wall fixed to the piston rod 32 with the open surface facing upward as in the first embodiment, and the upper holding member 33 The bottom wall is fixed to the mount bracket 37 with the surface facing upward. A washer 30 fixed to the piston rod 32 is applied to the upper surface of the upper rubber bush 35. The diameter of the upper rubber bush 35 is set to be larger than that of the lower rubber bush 36.
This makes it easier for the upper rubber bush 35 to bend than the lower rubber bush 36 for a radial load.

According to this, the lower rubber bush 36
Receives only the compressive load in the axial direction, and receives only the shear load due to the frictional force generated on the contact surface between the mount bracket 37 and the rubber bush 36 for the radial load. The upper rubber bush 35 receives a compressive load in both the axial and radial directions. Also in this case, by setting the diameter of the upper rubber bush 35 receiving the radial compressive load to be relatively large so that the deformation amount with respect to the radial load becomes larger, the compliance of the rubber bush as a whole with respect to the radial load is increased. And the sound insulation is improved.

[0017]

As described above, according to the present invention,
By securing the rigidity against normal axial load and increasing the compliance against radial load, it is possible to further enhance the absorption of high-frequency vibrations, so that micro-vibration can be achieved without impairing the damping response of the damper. And the amount of noise transmitted to the vehicle body can be reduced. That is, according to the present invention, the spring rigidity of the connection portion of the damper rod with the vehicle body is optimally tuned, and a great effect can be obtained in improving the sound insulation without impairing the connection rigidity with the vehicle body with respect to the axial load. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a third embodiment of the present invention.

[Explanation of symbols]

 1, 21, 31 Damper mount 2, 22, 32 Piston rod 3, 23, 33 Upper holding member 4, 24, 34 Lower holding member 5, 25, 35 Upper rubber bush 6, 26, 36 Lower side Rubber bushing 7, 27, 37 Mounting bracket 8, 28, 38 Collar 9, 29, 39 Insertion hole 20, 30 Washer

Claims (2)

[Claims] 1. A pair of rubber bushes each having a generally bowl shape and individually held by a holding member having a hole in a bottom wall are externally mounted on a shaft portion of a damper, and the vehicle body is vertically held by the pair of rubber bushes. What is claimed is: 1. A damper mount for a suspension system for a vehicle, wherein a shaft portion of a damper is connected to a vehicle body by being sandwiched, wherein the shaft portion is formed in a shaft portion insertion hole formed in the vehicle body by an inner periphery of the insertion hole. A damper mount for the vehicle suspension device, wherein the pair of holding members are mounted on the shaft with both open surfaces facing the vehicle body mounting surface side. . 2. A pair of rubber bushes each having a generally bowl shape and individually held by a holding member having a hole on the bottom surface are externally mounted on a shaft portion of a damper, and the vehicle body is sandwiched between the pair of rubber bushes from above and below. A damper mount for a vehicle suspension device configured to connect a shaft portion of the damper to a vehicle body, wherein the shaft portion is provided in a shaft portion insertion hole formed in the vehicle body, and an inner peripheral surface of the insertion hole. One of the pair of holding members has its bottom wall outer surface fixed to the vehicle body, the other is fixed to the shaft in the same direction as the one, A spring ratio of at least a radial load of the rubber bush held by the holding member is set to be lower than that of the other rubber bush.