Abstract: A two vacuum actuated switch mechanism is provided within an engine or hydromount. First and second ports are provided along a peripheral portion of an inertia track assembly. A decoupler or vacuum diaphragm is selectively exposed to vacuum through a first port. Under the influence of the vacuum, the decoupler can no longer oscillate. If vacuum is applied only to the decoupler, and not and idle diaphragm, the fluid is forced through a low frequency inertia track which creates high levels of damping and low frequencies. If vacuum is also applied to the decoupler and the idle diaphragm, the high frequency inertia track is opened and causes the fluid to flow therethrough. This creates a high frequency dynamic rate dip. Alternatively, if no vacuum is applied to either the decoupler or the idle diaphragm, the decoupler is allowed to freely oscillate creating a decoupled state for low input displacements. Higher input displacements results in fluids being forced through the low frequency inertia track.

Abstract: An electronically switchable bi-state engine mount includes a housing having an inertia track received in the housing between first and second fluid chambers. A fluid damped first path communicates between the chambers, and a non-damped second path or bypass opening also communicates between the chambers. A diaphragm encloses a portion of the second fluid chamber and a seal member on the diaphragm operatively cooperates with a solenoid plunger, where the solenoid is received in the housing to selectively open and close the second path. The diaphragm is enclosed by a cover, which is preferably metal, to enhance thermal conductivity and heat sink properties thereof and improve the useful life of the solenoid.

Abstract: A two vacuum actuated switch mechanism is provided within an engine or hydromount. First and second ports are provided along a peripheral portion of an inertia track assembly. A decoupler or vacuum diaphragm is selectively exposed to vacuum through a first port. Under the influence of the vacuum, the decoupler can no longer oscillate. If vacuum is applied only to the decoupler, and not and idle diaphragm, the fluid is forced through a low frequency inertia track which creates high levels of damping and low frequencies. If vacuum is also applied to the decoupler and the idle diaphragm, the high frequency inertia track is opened and causes the fluid to flow therethrough. This creates a high frequency dynamic rate dip. Alternatively, if no vacuum is applied to either the decoupler or the idle diaphragm, the decoupler is allowed to freely oscillate creating a decoupled state for low input displacements. Higher input displacements results in fluids being forced through the low frequency inertia track.

Abstract: The present disclosure relates to a damper assembly for use in a vehicle structure that includes a spare tire mounted thereto is provided. The damper assembly includes a support member extending from the structure and a damper secured to the support member. The damper is operatively interposed between and interconnects the structure and the spare tire for modulating relative motion of the spare tire with respect to the structure for damping vibrations of the structure.