| 摘要 |
PCT No. PCT/JP96/03230 Sec. 371 Date Jun. 30, 1997 Sec. 102(e) Date Jun. 30, 1997 PCT Filed Nov. 5, 1996 PCT Pub. No. WO97/17556 PCT Pub. Date May 15, 1997In a damping force variable hydraulic shock absorber 6 including a main valve 18 for opening and closing a main passageway 19 communicating with two main oil chambers 7a, 7b defined by a piston 9 within a cylinder 7, an auxiliary oil chamber 31 for causing a pressure within a high pressure side one of the oil chambers to act on the main valve 18 for movement in a valve closing direction, a pilot valve 35 provided for opening and closing a pilot passage 36 communicating the auxiliary oil chamber 31 to a low pressure side one of the oil chambers such that when the pressure within the auxiliary oil chamber 31 exceeds a preset pressure the pilot valve operates to open the pilot passage 36 to allow a working fluid to escape through the auxiliary oil chamber 31 toward the low pressure side thereby to vary the force biasing the main valve toward the closing direction, and preset pressure variable means 44 for variably controlling the preset pressure, a valve body 42 and a valve opening, both of the pilot valve 35, are so configured that a pressure receiving surface of the valve body 42 and a valve seat extending along a circumferential edge of the valve opening are positioned orthogonal to the direction of opening and closing movement of the pilot valve 35.
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