Title:
SHOCK ABSORBER
Document Type and Number:
WIPO Patent Application WO/2024/070527
Kind Code:
A1
Abstract:
Provided is a shock absorber that can achieve damping force characteristics in which the above-spring portion of a vehicle is stable regardless of road surface. This shock absorber comprises an inner cylinder, a piston, a first oil passage, a piston extension-side valve, a second oil passage, and a piston contraction-side valve. Among the piston extension-side valve and the piston contraction-side valve, the valve having the more frequency-dependent damping force is configured so as to match the valve having the less frequency-dependent damping force. In order to do so, for example, among the piston extension-side valve and the piston contraction-side valve, the valve (e.g., the piston extension-side valve) with the higher valve opening pressure is provided with a valve opening promotion mechanism so as to match the valve opening timing of the valve (for example, the piston contraction-side valve) with the lower valve opening pressure.
Inventors:
AOKI YASUHIRO (JP)
TANABE UMI (JP)
INOUE YOSUKE (JP)
TANABE UMI (JP)
INOUE YOSUKE (JP)
Application Number:
PCT/JP2023/032339
Publication Date:
April 04, 2024
Filing Date:
September 05, 2023
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F16F9/19; F16F9/348; F16F9/50
Foreign References:
| JP2009127818A | 2009-06-11 | |||
| JP2022013974A | 2022-01-19 | |||
| JP2020034068A | 2020-03-05 |
Attorney, Agent or Firm:
YAMAMOTO, Osamu et al. (JP)
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