Patent ID: 6527660
Filing Date: 2003-03-04
Classification: F16H

Abstract:
A transmission for use between a variable speed engine and a dynamoelectric machine to transmit drive torque to the dynamoelectric machine at a nominally constant speed from the variable speed engine, the transmission comprising:an input shaft to transmit drive torque from an engine to a remainder of the transmission; an output shaft to transmit drive torque to a dynamoelectric machine from the transmission; a differential including an input rotary element driven by said input shaft, an output rotary element driving said output shaft, and a third rotary element rotatably coupled to the input and output rotary element to control the speed ratio between the input and output rotary elements; a first variable displacement hydraulic unit rotatably coupled to the output rotary element to transmit torque between the first hydraulic unit and the output rotary element; a second hydraulic unit rotatably coupled to the third rotary element to transmit torque between the second hydraulic unit and the third rotary element, the first and second hydraulic units hydraulically connected in parallel to vary the rotational speed of the second hydraulic unit as a function of the displacement of the first hydraulic unit; and a third hydraulic unit driven by the input shaft and hydraulically connected in parallel to the first and second hydraulic units to transfer hydraulic power thereto, wherein the third hydraulic unit is a variable displacement hydraulic unit to vary a rotational speed of the second hydraulic unit as a function of the displacement of the first and third hydraulic units.