Fluid-filled elastic mount whose orifice passage has sufficiently large cross sectional area exhibits improved fluid-tightness

摘要

A fluid-filled elastic mount including an elastic body elastically connecting a first mounting member and a cylindrical second mounting members for fluid-tightly closing one open end of the second mounting member, a partition and a closure members superposed on each other and fixed at their peripheral portions to the other open end of the second mounting member, by calking, to provide on one side of the partition member a pressure receiving chamber partially defined by the elastic body and on the other side of the partition member an equilibrium chamber partially defined by a flexible diaphragm fixed to the closure member. These chambers are filled with a non-compressible fluid. The partition member has a cylindrical positioning shoulder, while the closure member has a cylindrical wall portion which is press-fitted onto the positioning shoulder of the partition member, so that the partition and closure member are positioned relative to each other in their diametric direction. The partition member also has an axial protrusion extending in its circumferential direction and diametrically opposed to the cylindrical wall portion of the closure member with a radial spacing therebetween to define an annular passage, and a partition wall disposed at a circumferential portion of the annular passage to fluid-tightly intercept the annular passage. The annular passage is held in fluid communication with the pressure-receiving chamber through a first communication hole formed on one side of the partition wall and with the equilibrium chamber through a second communication hole formed on the other side of the partition wall, to serve as an orifice passage.