Hydraulic power transmission joint

A hydraulic power transmission joint disposed between an input shaft and an output shaft which are capable of relative rotations, for transmitting torque depending on rotational-speed differences between said two shafts, said hydraulic power transmission joint comprising:

• a housing coupled to said input shaft and having a cam face formed on the inner side of said housing;
• a rotor coupled to said output shaft and rotatably housed in said housing, said rotor including a plurality of axially extending plunger chambers;
• a plurality of plungers each accommodated reciprocatively under a pressing force of a return spring in each of said plurality of plunger chambers, said plurality of plungers being operated by said cam face upon relative rotations between said two shafts;
• a discharge hole formed in said rotor so as to communicate with said plunger chambers;
• a valve block having a high-pressure chamber which is in communication with said discharge hole, said valve block having an orifice which generates a flow resistance by the flow of oil discharged by the action of said plungers;
• a first bearing retainer provided adjacent to said valve block;
• a first bearing by way of which the inner periphery of said first bearing retainer is rotatably supported on said output shaft;
• a second bearing retainer following said first bearing retainer and having the outer periphery press-fitted into the interior of said housing, said second bearing retainer having on its inside an extension which extends in the axial direction of said output shaft;
• and
• a second bearing by way of which the outer periphery at the terminal end of said extension of said second bearing retainer is rotatably supported on the internal side of a differential gear case.