Patent ID: 7455158

Claim:
A viscous fluid coupling device comprising: a housing; a partition that divides the housing into a reservoir chamber and an operation chamber; a communication hole that is provided in the partition communicates the reservoir chamber and the operation chamber; a rotor that is disposed inside the operation chamber, the rotor being fixed to one end of a drive shaft and integrally rotates with the drive shaft; a valve that is disposed in the reservoir chamber and opens and closes the communication hole; a bimetal that deforms according to an ambient temperature and controls the valve to open and close by the deformation, and has an attaching portion formed at one end thereof; a rod that is fixed at one end to the inner circumferential side of the bimetal and fixed at the other end to the valve, and is rotatably supported by the housing; a bimetal holder that fixes the attaching portion of the bimetal to the housing; and a vibration isolator that is disposed between the bimetal holder and the bimetal, the bimetal holder being disposed on a side of the housing, wherein the vibration isolator is made of a heat insulating material or a heat insulating rubber, wherein the vibration isolator is joined to the bimetal holder, wherein the vibration isolator is fixed to a first attaching portion side and a second attaching end side on the bimetal holder, the first attaching portion and the second attaching end portion being on either side of the rod, and wherein the vibration isolator includes: a first vibration isolator that is fixed to the first attaching portion side of the bimetal holder; and a second vibration isolator that is fixed to the second attaching portion side of the bimetal holder.