Patent ID: 8104750

Claim:
A fluid filled vibration damping device comprising: a first mounting member and a second mounting member linked by a main rubber elastic body; a pressure receiving chamber whose wall is partially defined by the main rubber elastic body and filled with a non-compressible fluid; an equilibrium chamber whose wall is partly defined by a flexible film and filled with the non-compressible fluid; a fluid passage interconnecting the pressure receiving chamber and the equilibrium chamber; a movable valve body provided for switching the fluid passage between a communicating state and a blocked state through reciprocating operation; an electric motor employed for actuating the movable valve body; and an actuating force converter mechanism provided on an actuating force transmission path from the electric motor to the movable valve body, wherein rotational actuating force of the electric motor is transmitted as reciprocating actuating force to the movable valve body by the actuating force converter mechanism, and the movable valve body is formed with a hollow or solid valve stem portion that extends in a direction of reciprocating operation, a guide member is disposed fitting internally within or externally about the valve stem portion, and a rotation restricting mechanism is disposed between the guide member and the valve stem portion of the movable valve body for restricting rotation of the movable valve body about the valve stem portion extending in the direction of reciprocating operation, through engagement between the valve stem portion and the guide member.