Hydraulic-elastomeric mount displacement decoupler

Claim 1

A hydraulic-elastomeric mount comprising a pair of mounting members, a hollow elastomeric body means interconnecting said mounting members, an elastomeric diaphragm means closing said elastomeric body and forming therewith a closed cavity that is filled with liquid, a partition sealingly mounted at and about the periphery thereof in said mount and spanning said cavity so as to divide same into a chamber enclosed by said elastomeric body and a chamber enclosed by said diaphragm, and an elongated orifice connecting said chambers to effect damping, characterized by the combination of elastomeric means sandwiching and supporting said partition between said mounting members so as to permit limited substantially free travel of said partition below a predetermined vibration amplitude of one mounting member relative to the other so that flow through said orifice and thereby damping does not occur below said predetermined amplitude, and hydraulic damping decoupler means mounted in and between openings through said partition between said chambers for reciprocal movement in said partition in response to alternating pressure buildup in said chambers wherein said decoupler means alternately sealingly seats on opposite sides thereof with said partition about said openings so as to effect cyclic volume change in said chambers to thereby permit vibratory amplitudes below a prescribed level without forcing liquid through said orifice and thus without hydraulic damping thereby supplementary to that provided by the partition travel and while also cooperating with said partition to form a decoupler bypass passage through said openings during decoupler means movement prior to said seating to provide for limited flow through said partition between said chambers in bypass relation to said orifice so as to effect limited damping during decoupler operation and smooth transition between damping and no damping by said orifice.