Abstract: A vibration-proof mount includes an inner shell member comprised of a center pipe and a bush, and an outer shell member including a first collar and a second collar. The center pipe and the outer shell member are connected to each other by first and second elastomer members with a liquid encapsulated therein. A liquid chamber is formed between the first and second elastomer members and expanded and contracted in volume by a load, and an orifice is defined in the first elastomer member and connected to the liquid chamber. The orifice is formed by only a wall surface of the first elastomer member and hence, the sectional area of a flow path in the orifice can be insured to prevent a difference in characteristic between individuals of the vibration-proof mount, as compared with the case where the orifice is defined between a plurality of members.

Abstract: A fluid-filled elastic engine mount for a motor vehicle having an engine, comprising a first and a second mounting member which are connected by an elastic body that partially defines a pressure-receiving chamber, a flexible diaphragm member which partially defines an equilibrium chamber, and orifice means for effecting fluid communication between the pressure-receiving and equilibrium chambers. The orifice means defines a first and a second orifice passage which are respectively tuned to adjust respective different components of the idling vibrations of the engine, and a third orifice passage which is tuned to a frequency range lower than that of the engine idling vibrations.

Abstract: A fluid-filled elastic mount wherein a fluid-tight space defined by two mounting members, an elastic body and a flexible diaphragm is divided by a partition member into pressure-receiving and equilibrium chambers communicating with each other through at least one orifice passage, and through a rotary valve which is accommodated in a valve hole in the partition member such that the rotary valve is rotatable in sliding contact with a sliding surface of the valve hole. The valve has a cutout communicating with the equilibrium chamber, and a valve portion adjacent to the valve portion, so that the orifice passage is selectively closed by the valve member and opened through the cutout in communication with the equilibrium chamber. The elastic mount includes a mechanism for converting a reciprocating movement into a rotary motion of the valve. The mechanism includes a drive rod which is connected to the valve such that the connecting point is offset from the rotation axis of the vale in the radial direction.

Abstract: A liquid-sealing type vibration-isolating device has a primary fluid chamber and a subsidiary fluid chamber which communicate with each other through a short idle orifice and a long shock orifice, and a switch-over valve for connecting the primary and subsidiary fluid chambers with each other through the idle orifice in the low speed revolution range of an engine mounted on the device and through the long shock orifice in the medium-high speed revolution range. During the shifting of the switch-over valve, in order to prevent sudden increase in the spring constant of the device, the primary fluid is short-circuited with the subsidiary fluid chamber through a communication port, the inside of a valve member, a communication bore and an auxiliary communication passage.

Abstract: A power unit supporting apparatus for an automobile for supporting on a vehicle body a power unit including an engine portion having a crankshaft directed in a longitudinal direction of the vehicle body and a drive shaft extended in a lateral direction of the vehicle body for driving wheels, and further including a first elastic support device for elastically supporting on the vehicle body a first end of the power unit which is far from a compartment, a second elastic support device for elastically supporting on the vehicle body that intermediate portion of the power unit which sandwiches the center of gravity of the power unit between the first end and the intermediate portion of the power unit, and a displacement defining device provided between the second end of the power unit close to the vehicle room and the vehicle body to resiliently restrain a vertical displacement of the second end in an amount more than a predetermined level, wherein the spring constants of the first and second elastic support devic