Abstract: A hydraulic-elastomeric mount is disclosed having a hydraulic damping decoupler with a flexible membrane mounted for reciprocal movement in a reciprocal partition in response to alternating pressure buildup in two orifice connected chambers separated by the partition and decoupler so as to effect cyclic volume change in the chambers by limited travel of both the partition and decoupler and flexing of the membrane without forcing liquid through the orifice and thus without hydraulic damping thereby.

Abstract: A hydraulic mount assembly includes a pair of mounting members and a first resilient body member and a second resilient body member connected thereto, each body member preferably being substantially bell shaped and forming a cavity. The two body members are connected with the cavities facing each other and separated by an orifice plate to form a closed chamber. A decoupler is mounted in the plate to provide the desired damping action. The body members are preferably molded of elastomeric material, such as rubber, with the first wall portion of the first body exhibiting relatively high stiffness, a second wall portion exhibiting relatively low stiffness and the second body including a third wall portion exhibiting relatively intermediate stiffness. Preferably, the ratio of the three stiffness ratings is 2:0.25:1. In operation, under dynamic loading, the stiff portion of the first body does not allow any dimension change in the longitudinal direction.