| 摘要 |
A variable hydraulic shock absorber (6) comprising a main valve (18) adapted to open and close a main passage (19) for connecting main oil chambers (7a, 7b) defined by a piston (9) in a cylinder (7); an auxiliary oil chamber (31) adapted to allow the pressure in the high-pressure main oil chamber to serve to close the main valve (18); a pilot valve (35) which is provided so that it can open and close a pilot passage (36) for connecting the auxiliary oil chamber (31) with a low-pressure side, and which is adapted to open the pilot passage (36) to discharge the working fluid from the auxiliary oil chamber (31) to the low-pressure side when the pressure in the auxiliary oil chamber (31) has exceeded a set level, whereby a closing force applied to the main valve (18) is varied; and a device (4) for variably controlling the set pressure, wherein the pilot valve (35) includes a valve disc (42) which is so designed that a pressure receiving surface and a valve seat are perpendicular to the direction of opening and closing movements of the pilot valve (35).
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