Liquid-filled engine mount

Abstract

A liquid-filled engine mount is disclosed which includes a rubbery elastic member interposed between an engine and a vehicle body, a diaphragm positioned in opposed relation to the rubbery elastic member. The engine mount defines a liquid chamber therein. The liquid chamber holds an actuating liquid therein. The liquid chamber has a partition wall disposed therein. The partition wall separates the liquid chamber into primary and secondary chambers. The primary chamber is provided on a side of the elastic member while the secondary chamber is provided on a side of the diaphragm. The partition wall has first and second orifices extending therethrough. The first orifice communicates with both the primary chamber and the secondary chamber. The second orifice communicates with the primary chamber. The first and second orifices provide different resistances to the liquid flowing therethrough. The engine mount includes a resilient means for urging the diaphragm against the partition wall to close an opening of the second orifice. The engine mount includes a diaphragm driving means for forcing the diaphragm against a resilient force the resilient means exerts on the diaphragm to thereby open the opening of the second orifice, such that the second orifice communicates with the secondary chamber. The diaphragm has plural projections formed on a surface thereof.