Patent ID: 7837183
Filing Date: 2010-11-23
Classification: F16F

Abstract:
1. A viscous fluid-filled damper for damping vibrations transmitted between a supporting body and a supported body, comprising: a container body; a lid body for closing an opening end of the container body; and a viscous fluid filled in an inner space enclosed by the container body and the lid body, wherein: the container body is provided with a flexible portion made of an elastic material, and an annular connection portion made of a hard resin with a shape of a substantially flat plate and having an upper surface to which the flexible portion is firmly fixed and a lower surface to which the lid body is firmly fixed, the upper surface and the lower surface extending between the flexible portion and the lid body; the flexible portion has, on a firm fixation region thereof that is firmly fixed to the annular connection portion, a collar joint portion protruding widely in a direction of a plane of the annular connection portion; the flexible portion has a bellows portion with a corrugated longitudinal cross-sectional shape that is deformed through vibrations; the bellows portion has a valley portion formed as a depressed portion, and a mountain portion formed as a projecting portion; the valley portion has a bottom located on the lid body side with respect to a top of the mountain portion to allow the bellows portion to be displaced by a large distance in a horizontal direction and a vertical direction and the bottom of the valley portion is spaced from the lid body by a first distance; the flexible portion is provided, at an end thereof opposite to the annular connection portion, with a coupling top portion which is coupled to one of the supporting body and the supported body; the coupling top portion includes a bottom surface spaced from the lid body by a second distance that is greater than the first distance; the coupling top portion includes a top surface spaced from the bottom surface; the top surface is external to the inner space and is spaced from the end of the flexible portion by a third distance; and the bottom surface contacts the viscous fluid and is spaced from the end of the flexible portion by a fourth distance.