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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/208200
Kind Code:
A shock absorber comprises a cylinder filled with hydraulic fluid, a piston slidably fitted into the cylinder, a piston rod connected to the piston and extending to the outside of the cylinder, a plurality of passages through which the hydraulic fluid flows as a result of sliding of the piston inside the cylinder, and a damping force generation mechanism that is provided in some of the passages and restricts the flow of the hydraulic fluid to generate a damping force. The damping force generation mechanism includes a valve body inside of which the passages pass through, an annular seat into which the valve body projects and which surrounds the passages, and a disk which is installed so as to be capable of seating on the seat, the contact width between the disk and the seat varying depending on a circumferential position. As a result, a shock absorber capable of preventing a sudden change in the damping force caused by opening of the disk valve without using a complicated structure is obtained.

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MATSUDA Kazuya (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
YAMASHITA Mikio (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
TANABE Daisuke (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
HARADA Naofumi (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
Publication Date:
October 31, 2019
Filing Date:
April 09, 2019
Export Citation:
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HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
F16F9/348; F16F9/32; F16F9/46; F16F9/508
Foreign References:
Attorney, Agent or Firm:
POLAIRE I.P.C. (13-11, Nihonbashikayabacho 2-chome Chuo-k, Tokyo 25, 〒1030025, JP)
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