| 摘要 |
PROBLEM TO BE SOLVED: To absorb vibration in the wide frequency range by linearly arranging a main liquid chamber, a first sub liquid chamber, a second sub liquid chamber, a diaphragm, and an air chamber along the radial direction of an outer cylinder in a vibration isolator of an engine of an automobile. SOLUTION: A main liquid chamber 28, a first sub liquid chamber 46, and a second sub liquid chamber 48 are provided in an outer cylinder 16, the main liquid chamber 28 and the first sub liquid chamber 46 are connected to each other by a shake orifice 30, and the main liquid chamber 28 and the second sub liquid chamber 48 are connected to each other by an idle orifice 32. A pipe 52 is connected to an air chamber 43 facing a diaphragm 44 of the second sub liquid chamber 48 connected to an intake manifold 70 through a solenoid valve 56. In shake vibration, the solenoid valve 56 is opened, air in the air chamber 43 is sucked by negative pressure of the intake manifold 70, the diaphragm 44 is brought in close contact with the outer cylinder 16, and expansion and contraction of the second sub liquid chamber 48 are made impossible. The shake vibration is absorbed by making liquid pass only the shake orifice 30. In idle vibration, since the shake orifice 30 is clogged, the diaphragm 44 is expanded by closing the solenoid valve 56, the second sub liquid chamber 48 is enabled to be expanded and contracted, and the idle vibration is absorbed by making liquid pass in/out by the idle orifice 32. |
