Hydrodynamic torque convertor with double circuit torus flow and lock-up clutch

Claim 1

A hydrokinetic torque converter mechanism comprising a bladed impeller, a bladed turbine and a bladed stator situated in toroidal fluid flow relationship in a torus circuit, said impeller having an impeller housing enclosing said impeller, said turbine and said stator, a stator sleeve shaft held in a relatively fixed position, an impeller hub sleeve surrounding said stator sleeve shaft and defining therebetween an annular flow passage, a turbine hub joined to said turbine, a turbine shaft secured to said turbine hub and extending through said stator sleeve shaft and defining therewith a second annular flow passage, a lock-up clutch disc located between said turbine and one side of said housing, said housing and said clutch disc each carrying thereon a friction surface, said friction surfaces being arranged in adjacent juxtaposed relationship, a torus circuit fluid flow passage defined in part by said first annular passage and by said second annular passage, said flow circuit including two portions, one portion being defined by the annular space between said friction surfaces and by the space between said clutch disc and said housing and the other portion being defined by a fluid flow bypass passage between the flow exit section of said turbine and said second annular passage, said bypass passage being defined in part by a one-way flow valve, which permits fluid flow from said torus circuit to said second annular passage but prevents fluid flow in the opposite direction, a first of said friction surfaces being located on the periphery of said housing and a second of said friction surfaces being carried by said clutch disc at a location between the first friction surface and a wall of said housing, an increase in the pressure in the space between said one housing side and said clutch disc creating a pressure force on said clutch disc which engages the same to produce a direct driving connection between said turbine and said impeller, said clutch hub being provided with axial flow passages that establish communication between said second annular passage and the space between said clutch disc and said one housing side.