Fluid-filled vibroisolating device

Abstract

A fluid-filled vibroisolating device includes a joint member adapted to be joined to a vibrating body such as an engine, a support member adapted to be supported on a supporting body such as a vehicle frame and defining an expandable and contractible auxiliary fluid chamber filled with a fluid, an elastomeric member interconnecting the joint and support members and disposed in a vibrating direction in which the vibrating body vibrating direction in which the vibrating body vibrates, the elastomeric member, the joint member, and the support member jointly defining an expandable and contractible main fluid chamber filled with a fluid, a partition mounted in the support member and separating the main and auxiliary fluid chambers from each other, the partition having flow regulator for regulating the flow of the fluid between the main and auxiliary fluid chambers, and a reinforcing member integrally formed with the elastomeric member for preventing the elastomeric member from being collapsed. By selecting various parameters of the device to meet a predetermined equation, and providing as the flow regulator an orifice between the main and auxiliary fluid chambers for allowing the fluid to flow or resonate, and also a movable plate movable dependent on the difference between the fluid pressures in the main and auxiliary fluid chambers, the damping capability of the fluid-filled vibroisolating device is improved and the dynamic spring constant thereof is uniformly lowered in a wide range of frequencies.