| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent excessive increase of damping force by inhibiting a rise of pressure in a back pressure chamber against high frequency vibration in a pilot (back pressure) type damping force adjusting hydraulic shock absorber. Ž<P>SOLUTION: Damping force is generated by controlling flow of oil between an annular oil passage 21 and a reservoir 4 generated by sliding of a piston in a cylinder by a pilot (back pressure) type damping valve 27 and a pressure control valve 28 (solenoid valve) in the damping force adjusting shock absorber. Damping force can be directly generated by the pressure control valve 28 and open pressure of the damping valve 27 can be controlled by adjusting inner pressure in a back pressure chamber 53, and an adjustment range of damping force characteristics can be widened. Amplitude of a movable mass 63 is amplified due to resonance against unsprung resonance (high frequency vibration) of a suspension device of a vehicle, and pressure in the back pressure chamber 53 is relieved by opening relief ports 69, 70. Consequently, excessive increase of damping force is prevented and deterioration of ride comfort is prevented. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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