Patent ID: 8474800
Filing Date: 2013-07-02
Classification: F16F

Abstract:
1. A fluid filled type vibration damping device comprising: an inner shaft member; an outer tube member situated such that the inner shaft member is situated to a side of and spaced apart from a first opening of the outer tube member; an elastic rubber body elastically connecting the inner shaft member and the outer tube member; a pressure receiving chamber whose wall is partially defined by the elastic rubber body and filled with a non-compressible fluid; an equilibrium chamber whose wall is partially defined by a flexible film and filled with a non-compressible fluid; and an orifice passage connecting the pressure receiving chamber and the equilibrium chamber with one another, wherein: the elastic rubber body has a solid rubber wall of frustoconical shape defining the wall of the pressure receiving chamber, with the inner shaft member bonded to a small-diameter end of the solid rubber wall and the first opening of the outer tube member being bonded to an outside peripheral face of a large-diameter end of the solid rubber wall, at two circumferential locations of the solid rubber wall, which two circumferential locations are opposed to each other in a first axis-perpendicular direction that is orthogonal to an axis of the device, inside-face-recesses that open onto an end face of the large-diameter end of the solid rubber wall and outside-face-recesses that open onto an outside peripheral face of the solid rubber wall are formed, respectively, so that a pair of thin portions are formed at the two circumferential locations, and a pair of thick portions that are thicker in comparison with the thin portions are formed at other two circumferential locations of the solid rubber wall, which other two circumferential locations are opposed to each other in a second axis-perpendicular direction orthogonal to the first axis-perpendicular direction as well as the axis of the device; a deepest part of the inside-face-recesses is situated closer to the inner shaft member than the outer tube member with the inside-face-recesses having an axis-perpendicular direction cross sectional shape that becomes progressively shallower towards the outer tube member side; a deepest part of the outside-face-recesses is situated closer to the outer tube member than the inner shaft member with the outside-face-recesses having an axis-perpendicular direction cross sectional shape that becomes progressively shallower towards the inner shaft member side, the deepest part of the outside-face-recesses defines a deepest point of the outside-face-recesses that is deeper than any other point of the outside-face-recesses; inside peripheral sections of the inside-face-recesses have axially indented contours by virtue of indentation in an axial direction at an outside peripheral side of a distal end section of the inner shaft member; the deepest part of the inside-face-recesses situated in an inside peripheral section of the solid rubber wall is situated closer to an axial small diameter side of the solid rubber wall than the deepest part of the outside-face-recesses situated in an outside peripheral section of the solid rubber wall, with the inside-face-recesses and the outside-face-recesses overlapping one another in the first axis-perpendicular direction of the solid rubber wall; and when viewed from an axial view of the solid rubber wall, a circumferential width of each of the outside-face-recesses and the inside-face-recesses only gradually increases from a radially inner position to a radially outer position from the axis of the device, and the axial view is a view taken along the axis of the device.