| 摘要 |
PROBLEM TO BE SOLVED: To reduce a manufacturing cost for a vibrationproof device by utilizing negative pressure. SOLUTION: A movable plate 56 which constitutes a bulkhead on a lower side of a pressure receive liquid chamber 46 is linked with a bulkhead plate 58, and a coil spring 74 which energizes the bulkhead plate 58 and the movable plate 54 upward and integrally is arranged in an expansion and shrinkage air chamber 72 formed below the bulkhead plate 58. The expansion and shrinkage air chamber 72 is connected with a three-port two-position change-over valve 82 through a communicating pipe 76 and a pipe 78. The three-port two-position change-over valve 82 is connected with a connection pipe 86 which is communicated with an intake manifold 84, of an engine and an external air communicating pipe 88 which is communicated with the atmosphere, and the three-port two-position change-over valve 82 is changed over between these pipes. |
