AMPLITUDE SENSITIVE HYDRAULIC ENGINE MOUNTS

Engine mounts, either elastomeric or hydraulic, have three main functions: (1) support engine weight, (2) reduce the transmitted engine disturbance forces to the vehicle structure, and (3) limit engine motion caused by shock excitations. To control or reduce chassis or vehicle body vibration, the stiffness of the engine mount needs to be low and to control shock, large engine motions, the engine mount stiffness must be high. With rubber-to-metal (RTM) bonded mounts, this dual stiffness phenomenon is achieved by a special design. With hydraulic engine mounts, a decoupler is used to provide the dual stiffness requirement. But many studies have shown that the decoupler can rotate in its cage bound and get stuck, or due to density mismatch between the decoupler and the working fluid, the decoupler can sink and block fluid movement from one chamber to the other. Here in this paper, a new fluid or hydraulic engine mount design is proposed that is amplitude sensitive, yet it does not have any decoupler. Here in this paper, the new engine mount design is presented, its mathematical models are derived, and simulation results are presented using MATLAB.