| 摘要 |
PURPOSE:To provide a low dynamic spring in a wide range. CONSTITUTION:A main liquid chamber 3 surrounded with a resilient body 2 is formed on the upper surface side of a partition wall 1 and an auxiliary liquid chamber 5 surrounded with a diaphragm 4 is formed on the under surface thereof. A large orifice having the one end communicated to the main liquid chamber 3 and the other end communicated with the auxiliary liquid chamber 5, a small orifice 10 having the one end communicated, with the main liquid chamber and the other end communicated with a large orifice 7, and a middle orifice 27 having the one end communicated to the other end of the large orifice 7 and the other end communicated with the main liquid chamber 3 are formed in the partition wall 1. Further, an on-off valve 12 to open and close a communicating state between the large orifice 7 and the main liquid chamber 3, between the small orifice 10 and the main liquid chamber 3, and between the middle orifice 27 and the main liquid chamber 3 is rotatably arranged to the partition wall 1. The main liquid chamber 3 and the auxiliary liquid chamber 5 are intercommunicated through the large orifice 7, the middle orifice 27, and the small orifice 10 according to the rotation position of the on-off valve 12. |
