Patent ID: 6311963
Filing Date: 2001-11-06
Classification: F16F

Abstract:
A fluid-filled vibration damping device comprising:a first mounting member;a second mounting member including a tubular portion having an end open toward the first mounting member, the first and second mounting members being spaced from, and opposed to, each other;an elastic rubber body which elastically connects the first and second mounting members to each other, and which fluid-tightly closes the open end of the tubular portion of the second mounting member and cooperates with said tubular portion to define a fluid chamber filled with a non-compressible fluid; anda working member which is supported by the first mounting member such that the working member extends, in the fluid chamber, in a direction substantially perpendicular to a central axis of the tubular portion of the second mounting member, and thereby divides the fluid chamber into two divided chambers which are located on opposite sides of the working member, respectively, and which are communicated with each other via a fluid-flow restricting passage defined by at least the working member,the elastic rubber body including at least one thin portion which is located on a side of one of the two divided chambers and which is thinner than a remaining portion of the rubber body so as to be more easily elastically deformable than the remaining portion,wherein the elastic rubber body includes at least one concave portion opening in the fluid chamber, and at least one wall portion defining a bottom of the at least one concave portion, the at least one wall portion providing the at least one thin portion, andwherein a ratio of an area of the concave portion that is projected in a direction parallel to a central axis of the elastic rubber body, to an area of the fluid chamber that is projected in s aid direction, falls within a rang e of 2 to 15%.