Gm Global Technolgoy Operations, Inc.

Craig W Lewitzke

Wojciech E Suchta

Sam M Jomaa

Daniel G Gannon

Dwayne Taylor

Kent Ting

Patrick E Fix, Iii

A system and method using a mount assembly for attaching a powertrain to a structural member of a vehicle. The mount assembly includes a first compliant member, a second compliant member, a first fluid chamber, a second fluid chamber, a third fluid chamber, a pressure compliant membrane, and a valve. A fluid conduit interconnects the first fluid chamber with the second fluid chamber to allow a fluid to pass from the first fluid chamber to the second fluid chamber. The third fluid chamber has an opening in communication with the second fluid chamber and a vent port. The pressure compliant membrane seals the opening between the second fluid chamber and the third fluid chamber. The valve selectively seals the vent port in the third fluid chamber. A first stiffness profile of the mount assembly is selected by actuating the valve to open the vent port. A second stiffness profile of the mount assembly is selected by actuating the valve to close the vent port.

Mount assembly with electro-hydro-pneumatic switchable displacement elements

A vehicle powertrain mount includes a housing and first and second compliant members coupled to and cooperating with the housing. An inertia track assembly cooperates with the first compliant member to form a first fluid chamber and second fluid chamber with the second compliant member. The inertia track assembly includes at least first and second channels for conducting fluid between the first fluid chamber and the second fluid chamber. An air chamber in the inertia track assembly cooperates with a decoupler disposed therein. A switching apparatus is operatively connected to the housing and selectively positionable relative to the inertia track assembly. The switching apparatus includes an actuator with a plunger having a first portion positionable relative to the second channel and a second portion synchronously positionable relative to the air chamber.

Hydraulic powertrain mount with dual low frequency inertia tracks and decoupling membrane with synchronous switching mechanization

A dual-rate resilient isolator having a plurality of raised, generally conical bumps formed on an engagement surface thereof. The bumps in combination with a main body of the resilient isolator provide a dual-rate for isolating CRFM noise vibration and or other vibrations (via the relatively softer resiliency of the bumps) and isolating road vibration and shock (via the relatively harder resiliency of the main body) even though the bumps and the main body are composed of the same resilient material.

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Commerce Township, MI, United States of America

Craig W Lewitzke