| 摘要 |
PURPOSE: To prevent 'high-speed heavy sound' which tends to occur during high-speed travelling of a car whose internal combustion engine is supported by a liquid seal engine mount. CONSTITUTION: A liquid seal engine mount effectively prevents vibration of engine from transmitting to a car body by damping the vibration by means of viscous resistance of incompressible fluid which passes through an orifice when a car travels at low-speed, but generates a high-speed heavy sound due to reduction of flowing volume of the fluid which passes through the orifice when the car travels at high-speed. Therefore, vibration damping effect is adjusted arbitrarily, by making piezoelectric boards 10 and 11 attached to a diaphragm board 12 by which a main fluid room 13 is divided from a sub fluid room 14, by applying arbitrary voltage to one piezoelectric board from a control circuit 19 or the like as well as detecting deformation of the diaphragm 12, in other words, pressure difference between the main fluid room and the sub fluid room by means of the other piezoelectric board, by controlling the pressure difference by making the diaphragm board 12 deformed in an arbitrary mode, and by controlling incompressible fluid flow which passes through the orifice from outside. |
