Systems and methods for cooling power transmission systems are include providing oil through an aperture defined in a housing to a stator cooling ring, through the stator cooling ring and into stator cooling channels, through the stator cooling channels and into spaces defined between the housing and jet rings, and through holes in the jet rings and onto the end-windings. The stator cooling ring, stator cooling channels and jet rings can encircle the stator and end-windings and, via the holes in the jet rings, spray pressurized jets of oil from various angles onto the end-windings, and in particular middle regions thereof. Seals may be used between the jet rings and housing, and between the jet rings and stator ends. The seals may be compressed so as to form an interference fit between the jet rings and housing or stator ends as the case may be.

A hydraulic gearbox actuator with a hydraulic pump which has a pump body wherein a rotor is arranged, wherein a drive motor is provided with which the rotor can be driven in opposite directions, wherein two working chambers which are separated from each other are formed in the pump body, the working chambers each having two openings, of which at least three openings are connected to a respective pressure supply circuit, the one side of which is connected to a reservoir and the other side of which is connected to one of three pressure outlets of the gearbox actuator.

An automatic gearbox for a motor vehicle includes a lubricating or cooling device, a hydraulic pump having a first pump connection via which, in a forward operation of the hydraulic pump, the lubricating or cooling device can be supplied with a hydraulic fluid conveyed by the hydraulic pump during forward operation and thus flows through the first pump connection, and with a parking lock, which can be moved between an engaged state and a disengaged state and has a first operating space, into which the hydraulic fluid conveyed by the hydraulic pump during forward operation can be introduced so that the parking lock is hydraulically operable and an adjustment of the parking lock from one of the states into the other state can thereby be effected.

An oil management system for a vehicle includes a differential housing, a transmission housing, a lubricant tank, a suction line, a lubricant pump, and an air suction pump. The transmission housing is connected to the differential housing in an air-tight manner, and a lubricant through-passage is defined between the transmission housing and the differential housing. The lubricant tank is provided in the differential housing and has a lubricant suction opening in a lower region. The lubricant pump conveys lubricant from the lubricant tank through the suction line and conducts the lubricant to the lubrication points in the differential housing and the transmission housing. The air suction pump pumps air from the lubricant tank into the transmission housing so that an excess air pressure is maintained in the transmission housing.

A differential assembly include a housing defining an oil sump, a differential disposed in the housing, and a thermal-management system. The system includes an oil pump in fluid communication with the sump, a spool valve having an inlet connected to the pump, a first outlet, a second outlet, and a spool slidable to a first position in which the inlet is in fluid communication with the first outlet and to a second position in which the inlet is in fluid communication with the second outlet. The spool valve further has a chamber containing wax configured to move the spool according to a temperature of the wax such that the spool is in the first position when the temperature of the wax is within a first temperature range and is in the second position when the temperature of the wax is within a second temperature range.

The present invention includes a cooling system for a gearbox, the cooling system comprising: a pressurized housing in fluid communication with the gearbox configured to circulate a pressurized lubricant; and one or more cooling fins about the pressurized housing, wherein heat from the pressurized lubricant within the pressurized housing is actively convected through the one or more cooling fins.

An electric drive module (EDM) configured to generate and transfer drive torque to a driveline for propulsion of an electric vehicle. The EDM includes a gearbox assembly, an electric motor having a rotor and a stator, and a thermal management system. The thermal management system includes a fluid circuit configured to supply a fluid to the gearbox assembly, the rotor, and the stator, and a pump configured to direct the fluid through the fluid circuit. A valve is disposed on the fluid circuit and configured to selectively move between (i) a closed position where the fluid is not supplied to the stator, and (ii) an open position where the fluid is supplied to the stator for cooling thereof.

A power transmission device includes a motor, a gear mechanism connected downstream of the motor; and a pump that sucks oil through a pump inlet. A shortest distance between an open end of the pump inlet and a surface of a stator of the motor is shorter than a shortest distance between the open end of the pump inlet and a surface of the gear mechanism.

Systems are provided for a gear set housing. In one example, a system comprises a gear box housing configured to house a four stage gear set in combination with a shift actuator and a differential lock, wherein the four stage gear set comprises an input shaft, a first layshaft, a second layshaft, and an output shaft.

A fluid delivery system for supplying fluid to at least one machine assembly, in particular an engine and/or transmission of a motor vehicle, including: a first pump and a second pump; a drive for driving the first pump and/or the second pump; a reservoir for storing the fluid; and a filter module for filtering the fluid, wherein the first pump delivers fluid from the reservoir to the machine assembly in a supply flow and the second pump is arranged downstream of the machine assembly and delivers at least some of the fluid into the reservoir in a sub-flow downstream of the machine assembly and the filter module is embodied in the sub-flow.