Fluid-filled elastic mount having partition member which includes a double-layered section

Claim 1

A fluid-filled elastic mount including (a) a first and a second support member which are spaced apart from each other, (b) an elastic body disposed between the first and second support members for elastically connecting these support members, (c) a closure member supported by said second support member and cooperating with the second support member and the elastic body to define a fluid chamber which is filled with a non-compressible fluid, the closure member including a flexible portion, (d) a partition member supported by the second support member and dividing said fluid chamber into a pressure-receiving chamber on the side of said elastic body and an equilibrium chamber on the side of said closure member, and (e) means for defining a restrictor passage for restricted fluid communication between said pressure-receiving and equilibrium chambers, said fluid-filled elastic mount comprising: said partition member including an integrally formed member which has a thick-walled outer portion and a thin-walled inner portion inside said outer portion, said outer portion having a circumferential groove and being held in pressed contact with said second support member such that said groove is closed so as to define said restrictor passage; said thin-walled inner portion including a double-layered structure defined by a first layer formed of a first elastic material, and a second layer formed of a second elastic material which has a larger modulus of elasticity than said first elastic material, to adjust elasticity of said thin-wall inner portion and increase rigidity of said thin-walled inner portion, said first and second layers being in direct axial engagement with each other and elastically deformable together with each other due to a difference between pressures in said pressure-receiving and equilibrium chambers.