| 摘要 |
PROBLEM TO BE SOLVED: To compatibly ensure a traction force and avoid a tight corner braking phenomenon. SOLUTION: A friction clutch 10, a viscous coupling 11, a cam mechanism 12 and a return spring 13 are provided inside a highly viscous fluid chamber 9 between a first rotating member 1 and a second rotating member 4. In a low differential region, the torque of the viscous coupling 11 is reduced, the reaction force of the return spring 13 exceeds the connection force of the cam mechanism 12 to release the transmission of the driving force by the friction clutch 10. Since the friction clutch 10 is within the highly viscous fluid chamber 9, the torque caused by the viscosity of the highly viscous fluid is generated. Thus, the set torque in the low differential region is suppressed appropriately. In the high differential region, the torque of the viscous coupling 11 is increased, and the connection force of the cam mechanism 12 exceeds the reaction force of the return coupling 13 to generate the torque by the friction clutch 10. Thus, the set torque in the high differential region is increased.
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