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    • 3. 发明专利
    • VIBRATION DAMPER WITH VARIABLE DAMPING FORCE
    • JPH1061707A
    • 1998-03-06
    • JP16470097
    • 1997-06-20
    • MANNESMANN SACHS AG
    • FOERSTER ANDREAS
    • F16F9/46F16K31/06
    • PROBLEM TO BE SOLVED: To adjust a damping characteristic curve very closely by adjusting damping force by resilience changed by the stroke position of a damping valve, and connecting a magnetic narrow place and a magnetic conductor in parallel to adjust magnetic force. SOLUTION: A damper has a cylinder filled with a damping medium, and a piston rod is axially movable. The damping characteristic of the damper in case of extending the piston depends on a cutoff valve device so as to be adjustable stepwise or steplessly. A prior step valve 65 assuming a roll of controlling a main step valve constituting the cutoff valve device is changed in its position by an actuator of an electromagnetic coil 67. A spring support plate 93 is used to adjust an elastic body so as to change an axial position. A magnetic conductor 95 is used as another adjusting means of the prior step valve. The conductor 95 is arranged in a by-pass parallelly with a magnetic narrow place 97 of ring shape. Adjustment of the conductor 95 and spring support plate 93 is repeated to get very near the target of typical characteristic curve adjustment by a combination of both adjustment.