| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic shock absorber capable of improving reliability. ! SOLUTION: A hydraulic shock absorber 1a of the present invention comprises: a first expansion-side passage 15 communicating a rod-side oil chamber 2a with a reservoir chamber 5 and opened or closed by an expansion-side solenoid valve 17; a first contraction-side passage 31 communicating an opposite-to-rod-side oil chamber 2b with the reservoir chamber 5 and opened or closed by a contraction-side solenoid valve 35; a main expansion-side damping valve 25 provided in a second expansion-side passage 16 extending in parallel to the first expansion-side passage 15, applying a circulation resistance to a working fluid from the rod-side oil chamber 2a, and generating an expansion-side damping force; and a main contraction-side damping valve 36 provided in a second contraction-side passage 32 extending in parallel to the first contraction-side passage 31, applying a circulation resistance to the working fluid from the o |
