| 摘要 |
PROBLEM TO BE SOLVED: To reduce the sliding resistance of a piston in a hydraulic shock absorber with two pistons attached to a piston rod. SOLUTION: A first piston 3 and a second piston 4, coupled to the piston rod 10 are fitted into a cylinder 2 filled with oil, and an oil flow generated by sliding the first and second pistons 3, 4 in the cylinder 2 is controlled by an expansion-side damping valve B1 and a contraction-side damping valve B2 to thereby generate damping force. A piston band 41 is mounted into the peripheral groove 39 of the second piston 4 through an O-ring 40, and the second piston 4 is radially displaced with respect to the inner wall of the cylinder 2 by elasticity of the O-ring 40. When lateral force acts on the piston rod 10, the second piston 4 is radially displaced to allow the inclination of the piston rod 10, thereby suppressing an increase in the sliding resistance of the first and second pistons 3, 4. COPYRIGHT: (C)2009,JPO&INPIT
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