Shock absorber

A buffer and component technology, applied in the direction of shock absorbers, shock absorbers, springs/shock absorbers, etc., can solve the problems of insufficient damping force and unstable damping force, and achieve the goal of improving responsiveness and stabilizing damping force characteristics Effect

Inactive Publication Date: 2011-03-23
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the damping force of the piston rod is insufficient when it is in the high-frequency micro-amplitude stroke, and when it is in the low-frequency stroke, there is a hysteresis when the damping force is increased, resulting in unstable damping force

Method used

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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. refer to Figure 1 to Figure 3 A first embodiment of the present invention will be described. Such as figure 1 and figure 2 As shown, the shock absorber 1 of this embodiment is a so-called double-tube type shock absorber, which constitutes the following double-tube structure, that is, an outer tube 3 is provided on the outer periphery of the cylinder body 2, and an outer tube 3 is provided between the cylinder body 2 and the outer tube 3. An annular storage chamber 4 is formed. A piston 5 is slidably inserted into the cylinder 2, and the inside of the cylinder 2 is partitioned by the piston 5 into two cylinder chambers, namely, an upper cylinder chamber 2A and a cylinder lower chamber 2B. One end of the piston rod 6 is connected to the piston 5 by a nut 7, and the other end side of the piston rod 6 can slide and liquid-tightly pass through the guide rod 8 and the oi...

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Abstract

The present invention provides a shock absorber that is adjustable in damping force according to the stroke frequencies of a piston rod so as to improve responsibility of the damping force and obtain stable damping force properties. A piston (5) connected with a piston rod (6) is inserted into a cylinder (2). A damping-force adjusting mechanism (19) adjusts a passage area of a by-pass passage (20) communicated between upper, lower chambers (2A,2B) of the cylinder. A plate spring elastically retains a shutter and the opening of the variable pass at the extending and shrinking sides is adjusted by shift of the shutter and the shutter moves using the fluid force generated by shrinking. According to the characteristic of the vibration system composed of the shutter and the plate spring, the resistance is applied on the shift of the shutter and the damping force is adjusted according to the stroke frequency of the piston rod. Because the difference pressure between the upper, lower chambers of the cylinder is used as the push force of the shutter, the inefficacy stroke is suppressed to the minimum limit and the desired damping force is quickly raised.

Description

technical field [0001] The invention relates to a damping force adjustable buffer. Background technique [0002] For example, among the shock absorbers installed in the suspension device of a motor vehicle, there is known a shock absorber that can adjust the damping force characteristics and appropriately switch the damping force characteristics according to the driving state of the vehicle, thereby improving the steering stability and ride comfort. sex. [0003] Furthermore, Patent Document 1 describes a shock absorber in which the damping force is reduced in accordance with the stroke frequency of the piston rod relative to the high-frequency stroke caused by the unsprung vibration (bane vibration) of the suspension device. The damping force is increased based on the low-frequency stroke of the sprung vibration (Bane vibration), which can absorb the unevenness of the road surface, and can suppress the posture change of the vehicle body during acceleration, deceleration an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F9/50
CPCF16F9/5126
Inventor 根津隆石本笃史片山茂郎
Owner HITACHI AUTOMOTIVE SYST LTD
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