PURPOSE: To provide a hydraulic power transmission joint which performs locking only when differential movement of the joint used for distribution of driving power of a vehicle, is in the normal direction, can be used for shaft penetrating joint, has stable locking characteristics and torque characteristic, has a simple structure, and is inexpansively manufactured.
CONSTITUTION: Friction torque is telected acting on a valve body 11 due to sliding contact with a rotor 5, and load transducing mechanisms 11, 16, 17 transduce the friction torque to load only in the case that relative rotational direction of shafts is performed in one direction. A closure valve 24 which closes a fluid resistance generation means 22 receiving pressure from the load transducing mechanisms 11, 16, 17. A spring member energizes the load transducing mechanisms 11, 16, 17 with a specified load in a direction opposite to the closure valve 24.
YAMADA TAKEHISA