| 摘要 |
PROBLEM TO BE SOLVED: To obtain a desired damping force characteristic by increasing a degree of freedom in setting the damping force characteristic in a shock absorber. SOLUTION: A piston 5 connected to a piston rod 6 is fitted in a cylinder 2 having a hydraulic oil sealed therein. Flows of the hydraulic oil induced in extension-side and compression-side passages 11, 12 by the sliding of the piston 5 are controlled by extension-side and compression-side damping force generating mechanisms 13, 14 respectively to generate the damping force. In the extension-side and compression-side damping force generating mechanisms 13, 14, the hydraulic oil is introduced into back pressure chambers 30, 46 through back pressure introducing orifices 32, 48 respectively, and the opening of relief valves 28, 44 is controlled by the pressures in the back pressure chambers. In a low piston speed region, damping valves 34, 50 provided downstream of the back pressure chambers 30, 46 respectively are opened, and as the piston speed increases, the relief valves 28, 44 are opened to suppress an excessive increase of the damping force. When the relief valves 28, 44 are opened as a result of an increase in the piston speed, a stable damping force is obtained by maintaining the relief valves open at piston speed faster than or equal to the piston speed at which the relief valves are opened. COPYRIGHT: (C)2011,JPO&INPIT |
