Importance

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Abstract

An engine mount comprises a relatively stiff elastomeric member having an interior defining a first chamber containing hydraulic liquid. The elastomeric member is attached both to the engine and to the vehicle body. A flexible wall defines a second chamber and the two chambers are connected by a restricted channel. Engine vibration is transmitted to the liquid in the first chamber via the elastomeric member, and damping takes place because of the resistance to the flow of liquid between the two chambers or because of oscillation of the mass of the liquid in the restricted channel. In addition, a flexible membrane is supported by the interior wall of the elastomeric member and urged against this wall by a leaf spring, and the air pressure between the interior wall of the elastomeric member and the membrane is variable. When the air pressure is increased, the membrane moves away from the wall of the elastomeric member against the spring so that the first chamber is now partially defined by a flexible wall, thus reducing the damping effect and the stiffness.

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First Claim