JPS59525Y2 - hydraulic shock absorber - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic shock absorber in which the diameter of a passage for oil fluid circulation accommodated inside a cylinder is variable.

Conventional hydraulic shock absorbers include, for example, a valve in the piston that generates a hydraulic resistance force during the extension or contraction process, but this valve also increases the resistance force at low temperatures or when the operating speed increases. It was a structure.

For this reason, the strength of the upper and lower mounting parts of the hydraulic shock absorber has to be increased accordingly, resulting in increased cost and weight.

In view of the above, an object of the present invention is to provide a hydraulic shock absorber in which the diameter of a passage for oil fluid circulation is variable and an increase in resistance force is suppressed.

Specific examples will be explained below based on the drawings.

The hydraulic shock absorber of the present invention has a cylinder 1 as shown in FIG.
The piston 2 is slidable within the cylinder 1, and the piston rod 3 is connected to the piston 2 and protrudes from the cylinder 1 to the outside.
A passage member 5 is arranged inside the through hole 4.

The passage member 5 is made of a flexible plate, for example a rubber plate.
As shown in the figure, it is formed by winding it into a conical shape and bonding the overlapping part 5a, and a flange 6 is provided at the end of the large diameter part.

This passage member may be formed into a conical shape by molding a flexible synthetic resin material.

Shoulders 8, 8 are provided at the open ends of the through holes 4, 4 of the piston 2 so as to be opposite to each other, and the flange 6 of the passage member 5 is applied to the shoulders 8, 8, and the washer 10.
The passage member 5 is assembled into the piston 2 with the passage member 5 being held down by the piston 10.

The washer 10.10 has a large diameter hole 11 facing the large diameter part of the passage member 5 and a small diameter hole 12 facing the small diameter part.

In this example, two through holes 4, 4 are bored in the piston, and passage members 5, 5 are arranged in the respective through holes 4, 4 in opposite directions. 3 to provide cushioning, only the through hole and passage member located on the right side may be provided.

Furthermore, two or more through holes may be provided and the passage members may be arranged in the same direction.

An appropriate form may be selected depending on the purpose of use.

Since the configuration is as described above, the oil liquid 14 is inside the cylinder 1.
When the piston rod 3 is reciprocated and used, the oil in the chamber in the direction in which the piston moves is compressed, and the oil flows through the passage 15 in the passage member 5, causing resistance due to the restriction of this passage. A force is generated and a buffering action is performed.

Then, as the moving speed of the piston rod increases, the hydraulic resistance force also increases, so the flexible passage member is enlarged and the cross-sectional area of the passage 15 increases, acting to absorb the increase in the resistance force.

Similarly, when the temperature is low or the viscosity of the oil is high, the passage member 5 is expanded and the cross-sectional area of the passage 15 is increased, so that the increase in resistance is absorbed.

The effects achieved by the present invention are summarized as follows.

(1) When the operating speed of the hydraulic shock absorber increases and the resistance force increases, the diameter of the variable passage member changes greatly to prevent the generation of excessive resistance force.

Furthermore, when the temperature of the hydraulic shock absorber becomes low, the viscosity of the oil increases and the resistance force increases, but in this case as well, the diameter of the variable passage member gradually increases to prevent the generation of an excessive resistance force.

(2) Since it functions as a safety valve, there is no need to increase the strength of the hydraulic shock absorber attachment.

(3) With a general safety valve structure (set by a valve and a spring load), the valve opens suddenly when the set hydraulic pressure is reached, which may cause hunting, etc. However, the passage member of the present invention gradually opens as the pressure increases. Since the passage increases, there is no sudden change in resistance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the hydraulic shock absorber of the present invention, and FIG. 2 is a perspective view of a passage member. DESCRIPTION OF SYMBOLS 1... Cylinder, 2... Piston, 3... Piston rod, 4... Through hole, 5... Passage member.

Claims (1)

[Scope of utility model registration request] a cylinder, a piston-piston rod assembly slidably provided in the cylinder, an oil fluid contained in the cylinder, a through hole provided in the piston, and a piston rod assembly provided in the through hole. and a passage member formed by forming a flexible plate into a conical shape.