Patent ID: 7036804

Claim:
A hydraulic mount comprising: a) first and second mounting members; b) a body connected to one of the mounting members and a base connected to the other of the mounting members; c) an orifice plate assembly; d) a pumping chamber formed between the body and the orifice plate assembly and a reservoir formed between the orifice plate assembly and a member interposed between the orifice plate assembly and the base, the reservoir being at least partially filled with hydraulic fluid; e) a decoupler supported by the orifice plate assembly and in fluid communication with the pumping chamber, wherein the orifice plate assembly includes a first orifice plate including at least one opening therein forming a first fluid track for providing fluid communication between the pumping chamber and the decoupler, a second orifice plate having an orifice, a recess between the orifice plates for receiving the decoupler, the decoupler being secured in the recess in fluid tight sealing engagement with a wall delimiting the recess; f) a first air cavity formed between the decoupler and the second orifice plate and operable to damp relatively low amplitude vibrations in a predetermined frequency range; g) a second air cavity in communication with the orifice; h) a solenoid comprising a spring and a plunger, the solenoid being operable to hold the plunger in communication with the orifice when the solenoid is unenergized and close the orifice to prevent communication between the first and second air cavities, or, when the solenoid is energized, operable to move the plunger away from the orifice so as to permit communication between the first and second air cavities, thereby providing two dynamic response characteristics for the hydraulic mount, dependent upon the volume of air in communication with the decoupler; and i) a controller located within the hydraulic mount attached to the second orifice plate and electrically connected to the solenoid.