| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive hydraulic shock absorber ensuring stable damping force over a long-term use. SOLUTION: In this hydraulic shock absorber, a valve seat 13 of an extension side damping valve 11 is formed into a truncated conical shape, and according to the change of a seated position of a poppet 15 to the valve seat 13, a pressure receiving area of the poppet 15 is varied to cancel the fluctuation of spring force caused by the change of the mounting length of a compression spring 16 when the poppet 15 seated position is varied. Consequently, fluctuation in valve opening force caused by the displacement of the poppet 15 seated position is eliminated. In this way, the hydraulic shock absorber capable of generating the stable damping force over a long-term use can be provided by an extremely simple and inexpensive structure. COPYRIGHT: (C)2008,JPO&INPIT
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