VIBRATION ISOLATOR

WIPO Patent Application WO/2007/029739

A1

A vibration isolator in which a restrictive passage for communicating a main liquid chamber and an auxiliary liquid chamber is switched in a short time to either a first restrictive passage or a second restrictive passage according to a variation in a vibration frequency, and whose size is efficiently reduced. In the vibration isolator, when a plunger member (78) is moved by liquid pressure in a pressurized space (130) to a close position against urging force of a coil spring (90), the plunger member (78) closes an orifice opening (74), and when the plunger member (78) is returned to an open position by urging force of the coil spring (90), the plunger member (78) opens the orifice opening (74). Because the orifice opening (74) is formed such that the longitudinal opening width (L) in the axial direction of the isolator is greater than the lateral opening width (W) in the circumferential direction of the isolator, the area of the opening required for the orifice opening (74) is sufficiently secured, the longitudinal opening width (L) is made sufficiently small, and the distance between the open position and close position of the plunger member (78) is reduced.

JP6813998	Anti-vibration device
JPS59219537	FLUID-FILLED MOUNT
JPS62196433	LIQUID-SEALED VIBRATION ISOLATOR

UEKI TETSU (JP)

PCT/JP2006/317650

March 15, 2007

September 06, 2006

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BRIDGESTONE CORP (JP)
UEKI TETSU (JP)

F16F13/10; F16F13/06; F16F13/18; B60K5/12

WO2004081408A1

2004-09-23

JPH07310778A	1995-11-28
JPH0654940U	1994-07-26
JPH04272532A	1992-09-29
JPH04272533A	1992-09-29
JP2003004091A	2003-01-08
JP2000310274A	2000-11-07
JPH04236833A	1992-08-25

See also references of EP 1923597A4

SUGIMURA, Kosaku et al. (2-4 Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, JP)

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