| 摘要 |
PURPOSE:To change extension/contraction damping force by providing a damping force generating means, allowing liquid to flow from one side to the other, and a bypass passage, via a hollowed hole, in a partitioning member of a cylinder, and changing a speed of opening/closing the bypass passage through a mass body in the hollowed hole. CONSTITUTION:A liquid pressure shock absorber contains a cylinder 10, partitioning member 12 and a mass body 14. The cylinder 10 has a damping force generating means 20 for partitioning liquid chambers 16, 18 and a hollowed hole 24 provided with a bypass passage 22. Damping force is generated through a flow from the liquid chamber 16 to 18 by arranging a leaf spring valve unit 30 in ports 26, 28 of the partitioning member 12. A check valve is formed by arranging a valve unit 34 in an upper side of the port 28. The bypass passage 22 has a port 38 of connecting the liquid chamber 16 to 18 via the hollowed hole 24. The mass body 14, closing the port 38 and providing a small hole 49, has a check valve 48 for closing a hole 40. Damping force at extension time is made different from damping force at contraction time by increasing a speed of opening the bypass passage earlier than a speed of closing the bypass passage through the mass body by the check valve 48. |
