Hydrostatic torque measuring device for rotating shafts

In a hydrostatic torque measuring device for rotating shafts, the device comprising an input shaft and an output shaft, one of which is rigidly connected with a rotary wing piston and the other of which is rigidly connected with a cylinder having a wall in which the rotary wing piston is arranged, pressure chambers being formed in the cylinder by the rotary wing piston, to which chambers a pressure medium is supplied and the cylinder being provided with a plurality of cams to form automatically balancing throttle slits with the rotary wing piston in such a manner that the compressive force of the pressure medium, which is in equilibrium with the exerted torque, forms a measure for the magnitude of the torque, the improvement wherein said rotary wing piston is formed with a plurality of radially extending arms, and wherein said plurality of cams project from said cylinder wall with said wing piston arms extending between a frontal surface of said cams in such a manner that said arms of said rotary wing piston, said cams and said cylinder wall define a plurality of pressure chambers and an equal plurality of exhausted chambers, throttling surfaces at one of two edges of said frontal surface of each said cam forming an inner boundary surface of each said pressure chamber, said throttling surfaces forming with opposite surfaces of said arms of said rotary wing piston throttling slits for said pressure chambers in each direction of rotation of said rotary wing piston, and acting as stops therefor, and a return passage for the pressure medium being provided in each said cam and having an opening at said frontal surface thereof.