ES372107A3 - Hydrodinamic variable radius piston speed. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Hydrodynamic speed variator of radial pistons, comprising a pump whose rotor is linked to the motor shaft, and a hydromotor whose rotor is linked to the driven shaft, both the rotor of the pump and the hydraulic motor being provided with radial cavities in which inside pistons are slid out, pushed outwards by the pressure of the oil, which stop against a rotating ring arranged eccentrically with respect to the axis of the variator, respectively in the pump and in the hydromotor, the active chambers being furthermore of said cylinders reciprocally linked to each other. Through the conduits that pass into the fixed central shaft of the variator, so as to carry out a continuous circulation of the liquid between the pump and the hydromotor and vice versa, characterized by the fact that an auxiliary pump, for example of rotating radial vanes, housed in the same body of the variator to which the central shaft set in rotation is fixed by the motor shaft, it presses and holds the liquid in the closed circuit that includes the pump and the hydromotor, sucking it from the reservoir arranged on the base of the device and discharging the excess flow in the reservoir, thanks to the presence of suitable discharge valves. (Machine-translation by Google Translate, not legally binding)