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Shock absorber

A technology of buffers and pilot chambers, applied in the direction of shock absorbers, shock absorbers, springs/shock absorbers, etc., can solve the problems of excessive rise, decrease, and inability to obtain attenuation characteristics, and achieve stable attenuation force. Effect

Active Publication Date: 2011-06-22
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the structural reduction of the volume of the back pressure chamber by the opening of the main disc valve, the internal pressure of the back pressure chamber tends to rise excessively when the main disc valve is opened, resulting in the problem that the desired attenuation characteristics cannot be obtained.

Method used

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Embodiment Construction

[0022] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. like figure 2 As shown, the damping force adjustable hydraulic shock absorber 1 as the shock absorber according to the present embodiment has a multi-tube structure in which the outer cylinder 3 is provided outside the cylinder 2 , and a gap is formed between the cylinder 2 and the outer cylinder 3 . storage room4. A piston 5 is slidably embedded in the cylinder 2, and the piston 5 divides the interior of the cylinder 2 into two chambers: a cylinder upper chamber 2A and a cylinder lower chamber 2B. One end of the piston rod 6 is connected to the piston 5 through a nut 7, and the other end of the piston rod 6 passes through the upper chamber 2A of the cylinder body, and penetrates through the rod guide 8 and the oil seal 9 installed on the upper ends of the cylinder body 2 and the outer cylinder 3 And extend to the outside of cylinder body 2. On the lower ...

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Abstract

The flow of hydraulic fluid induced by sliding movement of a piston in a cylinder is controlled by a pilot-type main valve and a pilot valve to generate damping force. The valve opening of the main valve is controlled by adjusting the pressure in a pilot chamber through the pilot valve. A volume compensating chamber is defined by a flexible disk member so as to face the pilot chamber. The volume compensating chamber is communicated with a reservoir through communicating passages. When the disk valve opens, the volumetric capacity of the pilot chamber reduces. At this time, the flexible disk member deflects toward the volume compensating chamber, thereby suppressing an excessive rise in pressure in the pilot chamber and preventing an unstable operation of the pilot valve and the main valve to obtain a stable damping force.

Description

technical field [0001] The present invention relates to a shock absorber such as an oil shock absorber that generates a damping force by controlling the flow of fluid relative to the stroke of a piston rod. Background technique [0002] The shock absorber installed on the suspension device of a vehicle such as a motor vehicle generally slidably embeds a piston connected to a piston rod in a cylinder sealed with fluid, and responds to the stroke of the piston rod by means of damping holes, discs, etc. The damping force adjustment mechanism composed of a valve or the like controls the flow of fluid caused by the sliding of the piston in the cylinder to generate the damping force. [0003] In addition, for example, in the hydraulic shock absorber described in Patent Document 1, a back pressure chamber (pilot chamber) is formed on the back of the main disc valve as the damping force generating mechanism, and a part of the fluid flow is introduced into the back pressure chamber t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F9/34
CPCF16F9/465F16F9/464F16F9/34F16F9/348
Inventor 村上裕
Owner HITACHI ASTEMO LTD
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