JPH10220510A - Shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compensate the volumetric change caused by the advance/retraction of a piston rod through the contraction/expansion of gas in an actuator and a gas chamber. SOLUTION: This shock absorber comprises a cylinder 1 having a gas chamber 2 and an oil chamber 3, a piston 4 disposed in the oil chamber 3, a piston rod provided at the tip of the piston 4, a shock absorbing means 7 provided between the piston 4 and an inner wall 1a of the cylinder 1 while being wound on the piston rod 5, and a spring 9 provided between the cylinder and a mounting plate to automobile body 6 provided at the other end of the piston rod. In this case, the occurrence of the damping force at the pressing side.extending side is controlled by the going up and down of the cylinder and at the same time, the pressure equivalent to the volumetric change caused by the advance/ retraction of the piston rod is absorbed in the gas chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber for a vehicle, and more particularly to a shock absorber most suitable for a racing car.

[0002]

2. Description of the Related Art Conventionally, a shock absorber of this kind, particularly a shock absorber used for a racing car, includes a spring for cushioning on an outer peripheral surface of a cylinder, a spring for holding the spring for cushioning,
Is provided to complement the damping force change. However, in this type of racing car, the damping spring cannot be regulated due to breakage or malfunction of the holding spring during high-speed running, and the damping spring blinds and becomes entangled with the piston rod. In addition, there is a danger that the vehicle may not be able to run due to breakage of the shock absorbing spring or the like, and in some cases, an accident may occur.

[0003] As an improvement described above, a configuration for compensating for a change in damping force is disclosed in part. (1) JP-A-4-345
No. 516, shock absorber device (2)
There is a hydraulic shock absorber of No. 24228. The gist of these inventions is that, in the invention of (1), an oil chamber and a gas chamber are provided in a cylinder, a free piston is provided between the oil chamber and the gas chamber, and a pressure / extension side leaf is provided in the oil chamber. A piston equipped with a valve is provided, and the approach and removal of the piston rod are complemented by the contraction and expansion of the gas in the gas chamber by the compression / extension side leaf valve and the free piston. According to the invention of (2), an oil chamber and a gas chamber are provided in a cylinder, a free piston is provided between the oil chamber and the gas chamber, a piston is provided in the oil chamber, and an actuator is provided on the piston rod. The configuration is such that the approach of the piston rod and the volume of the piston rod are complemented by the contraction and expansion of the gas in the actuator and the gas chamber.

[0004]

Each of the above-mentioned inventions has a structure in which the integral of the piston rod in and out of the body is complemented by contraction and expansion of the gas in the actuator and the gas chamber.
Therefore, since it is necessary to provide ancillary equipment on the piston rod, there are problems such as a complicated structure and a need to secure a space for the actuator.
In particular, from a structural point of view, there is a problem that a racing car intended for high-speed running is unsuitable.

[0005]

SUMMARY OF THE INVENTION The present invention provides a shock absorber most suitable for a racing car intended for high-speed driving,
Alternatively, the following configuration is adopted in consideration of a simple structure and installation in a narrow space.

A first aspect of the present invention provides a cylinder having a gas chamber and an oil chamber in which gas and oil liquid are sealed, a piston provided in an oil chamber of the cylinder, and a piston provided at a tip of the piston penetrating the cylinder. A piston rod, a cushioning means such as a spring and an actuator wound around the piston rod and provided between the piston and the inner wall of the cylinder, and a vehicle body mounting piece provided at the other end of the cylinder and the piston rod And a spring provided between them.

According to a second aspect of the present invention, there is provided a cylinder having a gas chamber and an oil chamber filled with a gas and an oil liquid, a piston provided in the oil chamber of the cylinder, and a tip of the piston penetrating the cylinder. The provided piston rod,
A buffer device such as an actuator connected to the oil chamber;
A spring provided between the cylinder and a vehicle body attachment piece provided at the other end of the piston rod.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the example shown in FIG. 3, when a pressure-side force is applied to a piston rod, hydraulic oil in a lower oil chamber flows into an upper oil chamber through an oil passage, and a compression-side damping force is reduced. At the same time, the spring is tensioned or repelled (hereinafter referred to as tension) and pushes up the cylinder. At the same time, the pressure corresponding to the entering volume is absorbed by the gas chamber, so that the pressure applied to the hydraulic oil in the lower oil chamber is buffered. Excessive extension of the spring (coil spring) is avoided through the raising of the cylinder. Also, when the extension-side force is applied to the piston rod, the operating oil in the upper oil chamber flows into the lower oil chamber through the oil passage,
When the extension damping force is generated, the spring is compressed and pushes down the cylinder. At the same time, the pressure corresponding to the removal volume is absorbed in the gas chamber, so that the pressure applied to the hydraulic oil in the upper oil chamber is buffered. Avoid excessive compression of the spring through this cylinder elevation.

The example shown in FIG. 4 is also substantially the same as the example shown in FIG. 3, except for the configuration in which the upper and lower oil chambers are replaced by inner and outer oil chambers.

In the example shown in FIG. 5, when a pressure-side force is applied to a piston rod, hydraulic oil in a lower oil chamber flows into an upper oil chamber through an oil passage, and a pressure-side damping force is generated.
The spring is compressed and pushes up the cylinder. At the same time, the pressure corresponding to the entering volume is absorbed by the gas chamber, so that the pressure applied to the hydraulic oil in the lower oil chamber is buffered. Excessive extension of the spring is avoided via this cylinder lift.
In addition, when the extension force is applied to the piston rod, the hydraulic oil in the upper oil chamber flows into the lower oil chamber through the oil passage, and the extension damping force is generated, and the spring is pulled to push down the cylinder. . At the same time, the pressure corresponding to the removal volume is absorbed in the gas chamber, so that the pressure applied to the hydraulic oil in the upper oil chamber is buffered. Avoid excessive compression of the spring through this cylinder elevation. In this example, the spring may be omitted. It is also possible to attach an oil pump (buffer).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described below.

A first aspect of the present invention is a cylinder having a gas chamber 2 and an oil chamber 3 in which gas and oil liquid are sealed.
A piston 4 is provided in an oil chamber 3 of the cylinder 1, and upper and lower oil chambers 3a and 3b are formed. The upper and lower oil chambers 3a and 3b are connected via an oil passage 4a provided in the piston 4. Are in communication. Reference numeral 5 denotes a piston rod penetrating into the cylinder 1, and a piston 4 is provided at the tip of the piston rod 5. The other end of the piston rod 5 is provided with a vehicle body attachment piece 6 attached to the vehicle C. Reference numeral 7 denotes a buffering means such as a spring or an actuator which is wound around the piston rod 5 and provided between the piston 4 and the inner wall 1a of the cylinder 1. In this example, the spring is a spring. The buffer means 7 can be either fixed at both ends or free of both. Reference numeral 8 denotes a free piston which partitions the gas chamber 2 and the oil chamber 3. The free piston 8 is configured so that the pressure in the gas chamber 2 is absorbed by the volume of the entry / extraction volume by the vertical movement of the free piston 8. 9 is a spring provided between the cylinder 1 and the vehicle body attachment piece 6 provided at the other end of the piston rod 5.

The invention according to claim 2 is a cylinder having a gas chamber 2 and an oil chamber 3 in which gas and oil liquid are sealed.
A piston 4 is provided in the oil chamber 3 of the cylinder 1, and inner and outer oil chambers 3a 'and 3b' are formed via a partition 1b. The inner and outer oil chambers 3a 'and 3b' are separated from the partition 1b.
Are communicated via an oil passage 3c 'provided in the first passage. Reference numeral 5 denotes a piston rod penetrating into the cylinder 1, and a piston 4 is provided at the tip of the piston rod 5. The other end of the piston rod 5 is provided with a vehicle body attachment piece 6 attached to the vehicle C. Reference numeral 7 denotes a buffering means such as a spring or an actuator wound around the piston rod 5 and provided between the piston 4 and the inner wall 1a of the cylinder 1. In this example, a spring is used. Reference numeral 8 denotes a free piston that partitions the gas chamber 2 and the oil chamber 3, and has a configuration in which the pressure in the gas chamber 2 is absorbed by the up / down movement of the free piston 8. 9 is a spring provided between the cylinder 1 and the vehicle body attachment piece 6 provided at the other end of the piston rod 5.

A third aspect of the present invention employs substantially the same configuration as the first aspect of the present invention. However, the difference is that the gas chamber 2 is provided above the cylinder 1. And
In this example, an oil pump 10 is attached to the lower oil chamber 3b. The oil pump 10 may be provided detachably. Further, the amount of supply oil can be adjusted by adjusting the valve 11. Incidentally, a spring (not shown) for restricting the return and movement of the piston rod 5 may be provided.

[0015]

According to the present invention, a piston is provided in an oil chamber of a cylinder having a gas chamber and an oil chamber, a buffering means is provided on a piston rod provided at a tip of the piston, and the piston is provided between the cylinder and a vehicle body mounting piece. This is a configuration in which a spring is provided.
Therefore, it has the effect of avoiding excessive extension and compression of the spring and the effect of avoiding the adverse effects of the blind motion of the spring. In addition, it has features such as being able to provide an optimal shock absorber for a racing car intended for high-speed running, or being simple in structure and capable of being installed in a small space.

Further, the present invention has a structure in which a buffer device is provided in the oil chamber. Therefore, there is an effect that the excessive elongation and compression of the spring can be more reliably and precisely controlled, or that the spring can be used to avoid the adverse effects caused by the blind motion.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an attached state of the present invention.

FIG. 2 is an enlarged perspective view illustrating an example of the present invention.

FIG. 3 is an enlarged schematic diagram illustrating an example of the present invention.

FIG. 4 is an enlarged schematic diagram illustrating another example of the present invention.

FIG. 5 is an enlarged schematic diagram illustrating still another example of the present invention.

[Explanation of symbols]

 Reference Signs List 1 cylinder 1a inner wall 1b partition 2 gas chamber 3 oil chamber 3a upper oil chamber 3b lower oil chamber 3a 'outer oil chamber 3b' inner oil chamber 3c 'oil passage 4 piston 4a oil passage 5 piston rod 6 body mounting Piece 7 buffer means 8 free piston 9 spring 10 oil pump 11 valve C vehicle

Claims (3)

[Claims] 1. A cylinder having a gas chamber and an oil chamber filled with gas and oil liquid, a piston provided in an oil chamber of the cylinder, and a piston rod provided at a tip of the piston penetrating the cylinder. And a cushioning means such as a spring or an actuator wound around the piston rod and provided between the piston and the inner wall of the cylinder;
A spring provided between the cylinder and a vehicle body mounting piece provided at the other end of the piston rod. 2. A cylinder having a gas chamber and an oil chamber filled with gas and oil liquid, a piston provided in an oil chamber of the cylinder, and a piston rod provided at a tip of the piston penetrating the cylinder. And a spring provided between the cylinder and a vehicle body mounting piece provided at the other end of the piston rod. 3. The shock absorber according to claim 2, wherein the shock absorber is detachably provided in the oil chamber.