Patent ID: 7328888
Filing Date: 2008-02-12
Classification: B60K,F16F

Abstract:
1. A hydraulic antivibration device comprising: a first attachment fitting, a second cylindrical attachment fitting, a vibration-isolating base joining the second attachment fitting and the first attachment fitting and composed of a first elastomer, a diaphragm attached to the second attachment fitting and forming a liquid-filled chamber between the diaphragm and the vibration-isolating base, and a partitioning means comparting the liquid-filled chamber into a first liquid chamber on the vibration-isolating base side and a second liquid chamber on the diaphragm side, and an orifice formed between an outer peripheral face of the partitioning means and an inner peripheral face of the second attachment fitting and putting the first liquid chamber and the second liquid chamber into communication with each other, the partitioning means including an elastic partition membrane composed of a second elastomer and a pair of displacement-regulating members regulating the displacement amount of the elastic partition membrane from both sides thereof, the pair of displacement-regulating members having respective openings; wherein the openings consist of a first opening defined at a radially central location of each of the displacement-regulating members and a plurality of second openings defined around the first opening in a distributed manner; wherein the elastic partition membrane includes; wherein the first attachment fitting is constructed as a body frame side coupling means to be coupled to a body frame side and the second attachment fitting is constructed as a vibration generator side coupling means to be coupled to a vibration generator side, and thereby, part of a vibration transmitting path from the partitioning means to a body frame is constituted by the vibration-isolating base.