Patent ID: 9500257
Filing Date: 2016-11-22
CPC Classification: F16F

Claim Text:
1. A fluid-filled vibration damping device comprising: a primary fluid chamber which gives rise to internal pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input; an auxiliary fluid chamber which gives rise to pressure differentials relative to the primary fluid chamber at times of vibration input; an orifice passage which permits a low-viscosity, non-compressible sealed fluid filling the primary fluid chamber and the auxiliary fluid chamber to flow between the two fluid chambers; and an insoluble powder mixed in the sealed fluid filling the primary fluid chamber which provides a bubble nucleus and accelerates dispersed generation of bubbles when pressure within the primary fluid chamber is decreased, wherein the insoluble powder is composed of particles consisting of only (i) fluorine-based resins, (ii) silicone-based materials, or (iii) fluorine-based resins and silicone-based materials, and wherein the insoluble powder is configured to function as a bubble nucleus so that a multitude of smaller bubbles emerge in a dispersed manner before larger bubbles are generated due to cavitation within the primary fluid chamber.