| 摘要 |
PROBLEM TO BE SOLVED: To enable the acquisition of a compact and low-cost hydraulic circuit, exhibition of effectiveness even from minute vibration level, and exhibition of excellent and stable engine performance without anxiety in operation on a risk side, in a damping coefficient switching type hydraulic damper wherein an automatic change of the damping coefficient can be carried out without needing any external energy supply at all, and can always exhibit certainly an energy absorption capacity exceeding a usual hydraulic damper. SOLUTION: In a hydraulic damper wherein pressure accumulated in a buffer 21 is utilized for a driving force of an opening and closing valve 6, to a hydraulic circuit of the single opening and closing valve 6, the one where pressure of oil pressure chamber 4 on either side is higher is connected with the buffer 21- a back pressure chamber of the opening and closing valve 6, a direction switching valve 50 which can connect with a low-pressure side oil pressure chamber 4 a port which ejects back pressure of the opening and closing valve 6 of a pilot operation section 20 is provided, and changes automatically by differential pressure of the oil pressure chamber on either side, the pilot operation section 20 operates with hydraulic pressure transformer of oil pressure chamber with higher pressure, opening or closing movement to influence both directions of piston is made possible in single opening and closing valve-pilot operation section. COPYRIGHT: (C)2009,JPO&INPIT
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