| 摘要 |
PROBLEM TO BE SOLVED: To simplify a hydraulic shock absorber configured to slide a piston onto the inner periphery of an inner tube. SOLUTION: In the hydraulic shock absorber 10, the sectional area of an annular oil chamber 20 is formed to be equal to or more than the sectional area of a piston rod 40. A barrier wall member 30 includes a barrier wall check valve 50 which prevents, in extending stroke, oil from flowing from an oil chamber 21 to an oil basin chamber 22, and permits, in compressing stroke, oil from flowing from the oil basin chamber 22 to the oil chamber 21 only for a replenishment amount to be supplied to the annular oil chamber 20 resulting from the difference between the sectional area of the annular oil chamber 20 and the sectional area of the piston rod 40. In the extending stroke, oil corresponding to the contraction amount of a piston rod-side oil chamber 21A and oil to be discharged from the annular oil chamber 20 resulting from the difference between the sectional area of the annular oil chamber 20 and the sectional area of the piston rod 40 are carried from the piston rod-side oil chamber 21A to a piston-side oil chamber 21B and the oil basin chamber 22 only through a single extension-side connecting path 60, and in the compressing stroke, the oil in the piston-side oil chamber 21B is directly carried from the piston-side oil chamber 21B to the piston rod-side oil chamber 21A. COPYRIGHT: (C)2011,JPO&INPIT |
