Patent ID: 6257387
Filing Date: 2001-07-10
Classification: F16D

Abstract:
A hydraulic power transmission joint disposed between input and output shafts that are capable of relative rotations and adapted to transmit torque corresponding to a rotational-speed difference between said input and output shafts, said joint comprising:a housing coupled to one of said input and output shafts and having a cam face formed on its inner side surface;a rotor coupled to the other of said input and output shafts and adapted to be rotatably accommodated in said housing, said rotor having a plurality of plunger chambers formed in the axial direction thereof;a plurality of plungers each being accommodated in each of said plurality of plunger chambers in a reciprocative manner under a biasing force of a return spring, said plungers being axially displaced by said cam face upon relative rotations of said input and output shafts;a discharge hole formed in said rotor and communicating with said plurality of plunger chambers;a valve block having a high pressure chamber leading to said discharge hole, said valve block having an orifice adapted to generate a flow resistance by the low of oil displaced by the action of said plungers;a first one way valve for intake disposed in each of intake holes formed in the heads of said plurality of plungers, said first one way valve being adapted to open when each plunger is in its intake stroke but to close when it is in its discharge stroke; anda second one way valve for discharge disposed in each of discharge holes leading to said plurality of plunger chambers, said second one way valve being adapted to open when said plunger is in its discharge stroke but to close when it is in its intake stroke.