Patent ID: 6378850
Filing Date: 2002-04-30
Classification: F16F

Abstract:
A fluid-filled vibration damping device comprising:a first mounting member and a second mounting member which are spaced-apart from each other, said second mounting member having a cylindrical portion open to said first mounting member; an elastic body elastically connecting said first and second mounting members and partially defining a primary fluid chamber filled with a non-compressible fluid; a partition structure which includes an annular orifice member having a central hole and being fixedly supported by said second mounting member, while defining an orifice passage extending along an inner circumferential surface of said cylindrical portion of said second mounting member in a circumferential direction thereof, and a flexible rubber plate fluid-tightly closing said central hole of said orifice member, said partition structure partially defines said primary fluid chamber on one of opposite sides thereof; and a flexible diaphragm partially defining an auxiliary fluid chamber which is filled with the non-compressible fluid, held in fluid communication with said primary fluid chamber through said orifice passage, and located on the other side of said partition structure which is remote from said primary fluid chamber, said orifice member including a first and a second annular components which are made of a metallic material by pressing and are superposed on each other in an axial direction thereof so as to define therebetween said orifice passage, said first and second annular components being fixed together such that an inner peripheral portion of said first annular component is bent to form a calking portion which is calked to an inner peripheral portion of said second annular member over a substantially entire inner circumference of said orifice member, said flexible rubber plate being bonded at an peripheral portion thereof to a surface of said calking portion in a process of vulcanization of a rubber material to form said flexible rubber plate.