Patent ID: 6053843
Filing Date: 2000-04-25
Classification: B60W,F16H,Y10T

Abstract:
A drive device for an engine-driven load comprising, in the drive direction:an engine;a torque converter with an input shaft and an output shaft;a continuously variable transmission unit with a primary shaft and a secondary shaft adapted to transmit torque with the aid of friction forces, the combination of the engine and the torque converter on the primary shaft of the transmission unit being capable of generating a nominal torque (Tp,nom) greater than the maximum slipping torque (Ts,max) of the continuously variable transmission unit; anda limiting means operatively connected to at least one of the engine and torque converter to limit the torque (Tp) actually generated in operation by the combination of the engine and the torque converter on the primary shaft of the transmission unit to not exceed a defined limit level (Tq),wherein the engine and the torque converter are designed such that the nominal engine torque times the square root of the torque conversion factor (f) is approximately equal to the maximum slipping torque (Ts,max) of the transmission unit.