JPS63255110A - Spring constant variable mechanism of mount rubber for hydraulic shock absorber - Google Patents

Abstract

PURPOSE:To maintain a spring constant optimally at time of turning a vehicle by making an inner base, supporting mount rubber in a gap with an outer base, interlock with a vehicle steering member and opening it wide, thereby compressing the mount rubber. CONSTITUTION:When a vehicle is turned to the left, by way of example, an arm 31 of an actuating mechanism 27 is rotated upward with a shaft 32 as the center via a turning member 33 operating in response to a steering handle. Consequently, the piston rod 30 connected to this shaft 32 moves upward, and since hydraulic fluid in an upper oil chamber S1 at the inside of a cylinder 28 is compressed by a piston 29, this hydraulic fluid is fed to an oil chamber S in a cylinder 24 at thee hydraulic shock absorbing mechanism attached to a wheel at the right. Accordingly, a slider 25 lowers and goes inside of an inner base 21 which is therefore opened side. In consequence, mount rubber at the right is compressed, whereby a spring constant becomes higher, thus in particular roll is effectively checked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mechanism for changing the spring constant of a mount rubber of a hydraulic shock absorber used in an automobile or the like in accordance with a steering condition.

(Prior art) As a hydraulic shock absorber for a vehicle, for example, an inner base is attached to the upper end of the piston rod, an outer base is attached to the vehicle body side, and a mount rubber is bonded between the inner base and the outer base by baking, etc. There is a known device in which the device is supported on the vehicle body side.

In such a hydraulic shock absorber, the spring constant of the mount rubber has contradictory effects on ride comfort and handling stability, and when the spring constant is set high, handling stability increases but ride comfort deteriorates. When the spring constant is set low, the riding comfort improves, but the steering stability decreases, so
The spring constant of the mount rubber is set to a fixed value to achieve a balance between ride comfort and handling stability.

(Problem to be Solved by the Invention) In the above-mentioned hydraulic shock absorber, the spring constant of the mount rubber is set to a fixed value, so the spring constant of the mount rubber varies to a certain extent no matter what driving condition the vehicle is in. It is set to a value that provides ride comfort and handling stability.

Therefore, when the vehicle is traveling straight, the spring constant of the mount rubber is too high, making it impossible to obtain sufficient ride comfort, and when the vehicle is cornering, the spring constant of the mount rubber is too low, resulting in problems such as difficulty in providing proper ride comfort.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention forms the inner base so as to be expandable, and includes means for expanding the inner base according to the running condition of the vehicle. .

(Function) When the vehicle is traveling straight, the inner base is not expanded and the mount rubber is not compressed, thereby lowering the spring constant and improving ride comfort, and when the vehicle is cornering, the inner base is expanded and the mount rubber is compressed. Increase the spring constant.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

Fig. 1 is an explanatory diagram showing the installation state of a hydraulic shock absorber to which the variable spring constant mechanism according to the present invention is applied, Fig. 2 is a sectional view of the main part of the shock absorber, and Fig. 3 is a main part of the M street appliance. Sectional plan view, 4th
The figure is an exploded perspective view of essential parts of the same shock absorber.

A hydraulic shock absorber 1 is provided between a vehicle body 2 and a wheel 3, and this hydraulic shock absorber 1 includes a piston rod 12 inserted into an actuator tube 11 from above, and a spring seat 13 fitted over the top of the piston rod 12. and outer tube 11
A suspension spring 15 is stretched between the spring seat 14 attached to the upper outer periphery of
6 is press-fitted into the spring seat 13, and a dust rubber 17 is suspended from the lower surface of the spring seat 13.

In addition, an inner base 2 is provided at the upper end of the piston rod 12.
1, and attach the outer base 22 to the vehicle body 2.
The hydraulic shock absorber 1 is supported on the vehicle body 2 by adhering a mount rubber 23 between the outer peripheral surface of the inner base 21 and the inner peripheral surface of the outer base 22 by baking or the like. In this case, a slit 21a is formed around the inner base 21 in the axial direction from above so that it can be expanded, and a relief part 23a is formed in the mount rubber 23 at a portion corresponding to the slit 21a of the inner base 21. so that the spring constant when uncompressed is low.

A cylinder member 2 is provided at the top of the piston rod 12.
4 is fitted into the cylinder member 24, and a slider 25 for expanding the inner base 21 is slidably fitted into the cylinder member 24, and the tip of the slider 25 has an outer circumferential shape shaped like a truncated cone. 21, and then the cylinder member 2
The vehicle is provided with a slider operating mechanism 27 that moves the slider 25 in the vehicle forward and backward according to the steering condition of the vehicle.

This slider actuation mechanism 27 has a piston 29 slidably fitted into a cylinder 28 filled with hydraulic oil.
One end of an arm 31 is rotatably supported on a shaft 32 at one end of a piston rod 30 of the piston 29, and the arm 31 is further connected to a rotating member 33 that rotates in response to rotation of the steering handle. The other end is attached.

One oil chamber S1 in the cylinder 28 is connected to the tube 3.
4 communicates with the rear oil chamber S of the slider 25 in the cylinder member 24 provided in the hydraulic shock absorber 1 attached to the right wheel 3, and the other oil chamber s2 communicates with the left wheel 3 through the tube 35. Cylinder member 2 provided on the installed hydraulic shock absorber 1
It communicates with the rear oil chamber S of the slider 25 in the slider 4. However, in this case, when the steering wheel is turned to the left, the arm 31 rotates in the direction of arrow A, and the piston rod 3
0 moves eight times in the direction of arrow C. Note that when the rotation direction of the steering handle and the rotation direction of the arm 31 are in the opposite relationship, the oil chamber S1 is located at the rear of the slider 25 in the cylinder member 24 provided in the hydraulic shock absorber 1 attached to the left wheel 3. The oil chamber S2 may be communicated with the rear oil chamber S of the slider 25 in the cylinder member 24 provided in the hydraulic shock absorber 1 attached to the right wheel 3.

The operation of the hydraulic shock absorber constructed as described above will be explained below.

First, when the vehicle is traveling straight, the piston 29 of the actuating mechanism 27 is located near the center of the cylinder 28 and no oil pressure is applied to the oil chamber S in the cylinder member 24, so the slider 25 remains at approximately the initial position. Since it does not enter into the inner base 21, the inner base 21 also does not expand.

Therefore, the mount rubber 23 is not compressed, and the inner base 21 is attached to the mount rubber 23 at this time.
Since the relief portion 23a is formed corresponding to the slit 21a, the spring constant is lower than in the case where the inner base 21 is completely cylindrical, and better riding comfort is obtained.

Furthermore, it goes without saying that the spring constant can be lowered by setting the rubber hardness to be lower than the formation of the relief portion 23a.

When the steering wheel is turned to the left and the vehicle is cornering to the left,
The arm 31 of the slider operating mechanism 27 rotates in the direction of arrow A, and the piston rod 30 moves in the direction of arrow C. Therefore, the hydraulic oil in the oil chamber S1 is compressed by the piston 29, and the piston rod 30 is attached to the right wheel 3. Hydraulic pressure is applied to the oil chamber S in the cylinder member 24 provided in the hydraulic shock absorber 1.

As a result, the slider 25 descends and enters into the inner base 21, and at this time, since the inner base 21 has a slit 21a, it expands outward as the slider 25 enters, and the inner base 21 expands. As a result, the right mount rubber 23 is compressed and its spring constant increases, and the horizontal spring, which is particularly effective against rolls, increases, and its elasticity decreases, making it more fluffy, thereby suppressing rolls.

Further, when the steering wheel is turned to the right and the vehicle is cornering to the right, the arm 31 of the slider actuating mechanism 27 rotates in the direction of arrow B, and the piston rod 30 moves 8 in the direction of the arrow. Therefore, the hydraulic oil in the oil chamber S1 is compressed by the piston 29, and hydraulic pressure is applied to the oil chamber S in the cylinder member 24 provided in the hydraulic shock absorber 1 attached to the left wheel 3. As a result, the spring constant of the left mount rubber 23 is increased and roll is suppressed.

Since the amount of entry of the slider 25 during cornering depends on the amount of rotation of the steering wheel, the change in the spring constant of the mount rubber 23 also depends on the degree of cornering. In this case, the slider 25 can be changed by changing the diameter of the slider 25, the diameter of the piston rod 30 of the slider actuating mechanism 27, and the inner diameter of the cylinder 28.
The amount of change in the spring constant of the mount rubber 23 can be obtained by changing the amount of entry of the mount rubber 23. Furthermore, if a link is used between the attachments 32 and 33, it is possible to make the amount of rotation of the steering wheel and the movement of the slider in a non-linear relationship, and it is also possible to set the roll in cornering to an optimum state.

In the above embodiment, an example was described in which hydraulic pressure was used to advance and retreat the slider according to the steering condition of the vehicle, but the invention is not limited to this. For example, the rotation angle of the steering wheel may be detected by an angle sensor, etc. It is also possible to electrically operate the slider by determining the steering direction of the vehicle and driving and controlling actuator means such as a motor based on the determination result to move the slider forward and backward.

Further, the slider serving as the expanding means is not limited to the cylindrical shape as in the above embodiments, but may be of a type having four arms that expand the inner base by entering into the inner base, for example.

(Effects of the Invention) As explained above, according to the present invention, the inner base is made expandable and is provided with a means for expanding the inner base according to the running condition of the vehicle. By not expanding the base and not compressing the mount rubber, the spring constant can be lowered to improve riding comfort, and when the vehicle is cornering, the spring constant can be increased by expanding the inner base and compressing the mount rubber. can.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the installation state of the hydraulic M balance to which the spring constant variable mechanism according to the present invention is applied, Fig. 2 is a sectional view of the main part of the same shock absorber, and Fig. 3 is a main part of the same shock absorber. Plane sectional view, 4th
The figure is an exploded perspective view of the main parts of the same tyi balance. In the drawings, 1 is a hydraulic shock absorber, 2 is a vehicle body, 3 is a wheel, 1 is an outer tube, 12 is a piston rod, 21 is an inner base, 22 is an outer base, 23 is a mount rubber, 24 is a cylinder member, and 25 is a The slider 27 is a slider operating mechanism. Patent applicant Showa Seisakusho Co., Ltd. Agent
Patent Attorney Part 2 1) Yong-Immediate Question Patent Attorney
Kuni Ohashi Patent Attorney Koyama
Qualified Patent Attorney No 1) Shigeru Figure 1

Claims (1)

[Claims] In the mount rubber provided between the inner base on the hydraulic shock absorber side and the outer base on the vehicle body side, an expanding means faces the inner base, and this expanding means operates in conjunction with a steering member of the vehicle to open the inner base. A variable spring constant mechanism for a mount rubber for a hydraulic shock absorber, characterized in that the mount rubber is compressed by expanding the inner base.