| 摘要 |
PURPOSE:To eliminate breakage of a valve and to ensure a functional stability by forming a vibration sensing pressure receiving surface of a plunger in a dash port regulated by a check valve incorporating an orifice. CONSTITUTION:When a piston 3 is displaced in its extending direction due to vibration applied to a damper body, hydraulic oil in an extension side chamber 6 flows into a pressure side chamber 7 through passages L1, L2, L3 so as to produce a damping force. When the piston 3 is displaced toward the pressure side, the pressure of the pressure side chamber 7 becomes high, and accordingly a plunger 28 receives, at its pressure receiving surface, the pressure of a dash pot 50 which is fed through a check valve 25 so that it is pushed up overcoming a spring. Thus, the pressure in a pressure chamber 30 increases, and accordingly, a check valve element 25 closes a valve seat port 23 while an orifice 43 being opened so that the hydraulic oil is fed into a pilot chamber 40. That is, during one cycle of application of oscillation the responsiveness of the plunger 28 is held in a piston moderating speed range having such a degree that the internal pressure of the dash pot 50 can sufficiently follow up a variation in the pressure in the chamber. |
