Control for ball piston fluid transmission device

Claim 1

In a fluid transmission device comprising a hollow casing, a rotor rotatably mounted in said casing by a rotor shaft, said rotor having two rows of radial cylinders therein, pistons in said cylinders, and a reaction ring surrounding each row of cylinders for bearing against the outer ends of the pistons, the improvement which comprises a swivel disposed on one side of said casing outwardly of said reaction rings, said swivel having two reaction ring-engaging members offset 180* from one another, first control means in said casing diametrically opposite said swivel and engaging one of said reaction rings for forcing the same in one direction towards said swivel, and second control means in said casing diametrically opposite said swivel and engaging the other reaction ring for limiting the movement of said other reaction ring in the opposite direction, said swivel comprising a bar having one side of half-cylindrical shape and the opposite side flat, said casing having a halfcylindrical recess into which the half-cylindrical side of said bar engages, said flat side having therein a pair of half-round recesses offset 180* apart, said reaction ring-engaging members comprising round members engaged in the recesses in the flat side of the bar.