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Damping force adjustable shock absorber

A damping force and buffer technology, applied in the direction of shock absorbers, shock absorbers, liquid shock absorbers, etc., can solve the problem that the damping force in extremely low-speed areas cannot be adjusted

Pending Publication Date: 2022-01-11
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the very low speed valve described in Patent Document 1 is applied only to the piston of the damping force adjustable shock absorber described in Patent Document 2, it takes time to generate a differential pressure to open the very low speed valve, and it cannot Adjusting the damping force in the very low speed range

Method used

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  • Damping force adjustable shock absorber

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0031] A first embodiment of the present invention will be described with reference to the drawings. For convenience, the figure 1 The up and down directions in are directly referred to as "up and down directions".

[0032] Such as figure 1 As shown, the damping force adjustable shock absorber 1 of the first embodiment is a so-called control valve laterally mounted type damping force adjustable shock absorber in which the damping force adjusting mechanism 121 is mounted laterally on the cylinder 2 . The cylinder 2 has an inner cylinder 3 and an outer cylinder 4 arranged coaxially with the inner cylinder. Between the inner cylinder 3 and the outer cylinder 4, a storage chamber 6 is formed. It should be noted that oil (working fluid) is sealed in the inner tube 3 , and oil and gas are sealed in the storage chamber 6 .

[0033] In the inner cylinder 3 of the cylinder 2, a piston 18 is slidably embedded, and the piston 18 divides the inner cylinder 3 into two cylinder upper ch...

no. 2 approach

[0093] Next, refer to Image 6 , Figure 7 A second embodiment will be described. Here, differences from the first embodiment will be described. It should be noted that the same designations and reference numerals are used for the same parts as those of the first embodiment, and overlapping descriptions will be omitted.

[0094] In the first embodiment, if Image 6 As shown, on the piston 18, the third passage 223 is provided in parallel with the inlet valve 71 (first low speed valve), and on the third passage 223, the micro low speed valve 108 (third low speed valve) on the extension side is arranged in parallel. valve) and a very low speed valve 105 (fifth low speed valve) on the compression side. Furthermore, the extremely low speed valves 108, 105 are arranged on the cylinder lower chamber 2B (second chamber) side with respect to the orifice 88 provided in the third passage 223 and communicating with the cylinder upper chamber 2A (first chamber). chamber) and cylinder...

no. 3 approach

[0098] Next, refer to Image 6 , Figure 8 A third embodiment will be described. Here, differences from the first embodiment will be described. It should be noted that the same designations and reference numerals are used for the same parts as those of the first embodiment, and overlapping descriptions will be omitted.

[0099] In the first embodiment, if Image 6 As shown, on the piston 18, the third passage 223 is provided in parallel with the inlet valve 71 (first low speed valve), and on the third passage 223, the micro low speed valve 108 (third low speed valve) on the extension side is arranged in parallel. valve) and a very low speed valve 105 (fifth low speed valve) on the compression side. Furthermore, the extremely low speed valves 108, 105 are arranged on the cylinder lower chamber 2B (second chamber) side with respect to the orifice 88 provided in the third passage 223 and communicating with the cylinder upper chamber 2A (first chamber). chamber) and cylinder ...

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PUM

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Abstract

In a third passage, a compression-side ultra-low velocity valve, which allows oil liquid to pass through from a bottom chamber (second chamber) of a cylinder to a top chamber (first chamber) thereof, is disposed so as to be parallel to an extension-side ultra-low velocity valve. This can expand oil liquid in the top chamber (first chamber) in an ultra-low velocity zone of a compression step, which causes a differential pressure between the top chamber side and the bottom chamber side (second chamber) in the ultra-low velocity valve on the compression side (fifth low-velocity valve). As a result, the ultra-low velocity valve on the compression side opens in the ultra-low velocity zone, which can cause a damping force of a valve characteristic of the ultra-low velocity valve.

Description

technical field [0001] The present invention relates to a damping force adjustable damper that controls the flow of a working fluid accompanying the stroke of a piston rod to adjust a damping force. Background technique [0002] Patent Document 1 discloses a vibration absorber (shock absorber) including a very low-speed valve that opens in a very early low-speed region when the shock absorber starts to operate. In addition, Patent Document 2 discloses a so-called control valve lateral mounting type damping force adjustable shock absorber in which a damping force generating mechanism including a solenoid is laterally mounted on a side wall of an outer cylinder. [0003] In the damping force adjustable shock absorber described in Patent Document 2, the cylinder lower chamber is always in communication with the storage chamber through the orifice of the base valve. In addition, the pilot valve (control valve) of this damping force adjustable shock absorber is opened in the sof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F9/18F16F9/32F16F9/34F16F9/348F16F9/36F16F9/44
CPCF16F9/18F16F9/32F16F9/34F16F9/348F16F9/3484F16F9/3481F16F9/36F16F9/44F16F9/465F16F9/46F16F9/185F16F9/512F16F2222/123
Inventor 门仓皓介山下干郎
Owner HITACHI ASTEMO LTD
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