Abstract: Electrical devices such as motors and generators create heat as they operate. This can lead to lower performance and life. Therefore, it is important to provide cooling for such devices. This is particularly true in heavy duty applications such as earthmoving or other industries. Methods and apparatus are disclosed to provide cooling that involves the circulation of two fluids in defined pathways. Heat within a case or other enclosure for an electrical device is transferred to one fluid. Heat from the one fluid is subsequently transferred to the other fluid. In one example, this heat transfer may occur across fins for increased effectiveness. It is also preferred that the flow of fluid beclosed loop so that contaminants are not introduced into the electrical device. By providing the heat transfer out of the electrical device as described, cooling is enhanced that can lead to longer lived and better performing devices.

Abstract: A differential assembly includes an electrically operated input device and a first planetary assembly in driving engagement with the input device. The first planetary assembly is drivingly connected to a first output assembly. A second planetary assembly is in driving engagement with the first planetary assembly and the second planetary assembly is drivingly connected to a second output assembly. The first planetary assembly co-acts with the second planetary assembly to provide substantially the same torque to the first and second output assemblies and the first and second planetary assemblies include axes of rotation substantially aligned with an axis of rotation of the input device.

Abstract: The control system and method includes a plurality of clutch actuators adapted to be connected to clutches disposed for connecting members of the transmission to an input or output, respectively; first and second electrical motor/generators connected to respective members of the transmission and operable in a motor mode for controllably rotating the members and in a generator mode controllably rotated by the members to generate electrical energy; a sensor for sensing a speed representative of a rotational speed of the input or output; and a processor operably connected to the sensor, the motor/generators and the clutch actuators, the processor being operable for operating one of the motor/generators in the generator mode while operating another of the motor/generators in the motor mode powered by the one of the motor/generators so as to controllably rotate selected of the members of the transmission at speeds corresponding to a sensed rotational speed of the input or output for disconnecting one of the select

Abstract: A transmission and an associated method for operatively connecting components associated therewith include a hydrostatic transmission, a mechanical transmission having a planetary gearing mechanism, the mechanical transmission being driven by an engine and the hydrostatic transmission being driven by and interacting with the mechanical transmission to provide infinitely adjustable power flow through the transmission. The planetary gearing mechanism includes three planetary gear sets and five members to connect the transmission to an output.