Abstract: A viscous fluid coupling device includes: a plate that divides a housing into a reservoir chamber and an operation chamber; communication holes that are provided in the plate and communicate the reservoir chamber and the operation chamber; a rotor that is disposed inside the operation chamber and fixed to one end of a drive shaft and rotates integrally with the drive shaft; a valve that is disposed in the reservoir chamber and opens and closes the communication holes, a rod that is fixed at one end to the valve and fixed at the other end to the inner circumferential side of a vortical bimetal and rotatably supported on the housing; a bimetal holder that fixes an attaching outer end formed by bending the outer circumferential side of the bimetal; and a vibration isolator that is disposed between the bimetal holder and the bimetal.

Abstract: A viscous fluid coupling device includes: a plate that divides a housing into a reservoir chamber and an operation chamber; communication holes that are provided in the plate and communicate the reservoir chamber and the operation chamber; a rotor that is disposed inside the operation chamber and fixed to one end of a drive shaft and rotates integrally with the drive shaft; a valve that is disposed in the reservoir chamber and opens and closes the communication holes, a rod that is fixed at one end to the valve and fixed at the other end to the inner circumferential side of a vortical bimetal and rotatably supported on the housing; a bimetal holder that fixes an attaching outer end formed by bending the outer circumferential side of the bimetal; and a vibration isolator that is disposed between the bimetal holder and the bimetal.

Abstract: A fluid coupling device comprising, a drive shaft rotated by a rotational torque of an driving source; a case rotatably supported on the drive shaft and forming a space, a rotor disposed in the space and fixed to the drive shaft and forming a fluid reservoir chamber, an operation chamber formed between the rotor and the case, a flow passage communicating with the fluid reservoir chamber, a flow hole formed in the rotor and the operation chamber, a valve disposed in the fluid reservoir chamber for operating the opening and closing of the flow hole, a rod rotatably disposed in the drive shaft and fixed to the valve, a magnet integrally rotated with the rod and a coil that generates a force in opposite direction to a rotational direction of the drive shaft.

Abstract: A fluid coupling for an engine includes a shaft, a housing rotatably supported on the shaft, a cover fixed to the housing, a separation plate which separates a chamber defined by the housing and the cover into a store chamber and an operation chamber, wherein the store chamber is formed with at least a first store chamber and a second store chamber which are mutually arranged in a circumferential direction of the fluid coupling. The fluid coupling for an engine further includes a first opening disposed on the separation plate connecting the first store chamber and the operation chamber, a second opening disposed on the separation plate connecting the second store chamber and the operation chamber, valve mechanism opens and closes the first opening and the second opening and a rotor disposed in the operation chamber and fixed on the shaft.

Abstract: A viscous fluid coupling includes a labyrinth device for transmitting rotational torque from an input member to an output member through viscous fluid and a temperature sensing bi-metal spiral spring element for controlling a flow of the viscous fluid toward the labyrinth device. A part of the spring element located outside with respect to a part for supporting a concentrated part of the stress in the spring element is welded to a holder plate.