Abstract: Methods and systems are provided to cool an electric machine rotor. The electric machine fluid cooling system includes, in one example, one or more air vents in fluidic communication with one or more radial cooling passages of a rotor shaft. In the system, the radial cooling passages are in fluidic communication with one or more rotor shaft cooling passages that extend through the rotor shaft and an inlet cooling passage.

Abstract: Methods and systems are provided to cool an electric machine rotor. The electric machine fluid cooling system includes, in one example, an air vent in fluidic communication with a radial coolant passage of a rotor shaft. In the system, the radial coolant passage is in fluidic communication with a rotor shaft coolant passage that extends through a rotor shaft and an inlet coolant passage that extends through a rotor shaft.

Abstract: Systems are provided for a cooling system for an electric vehicle. In one example, a system includes a shaft assembly comprising a shaft, a shaft end cap, and an insert, wherein the insert is arranged in a cavity shaped by the shaft and the shaft end cap.

Abstract: Disclosed is an 8-speed gearbox for a dual clutch transmission, with a particular gear arrangement of the gears on the countershaft, wherein the speed or reverse gear of a gear pair that is a permanently rotationally and axially fixed gear is the radially smaller of the gear pair. One or two cluster gears may be provided, each cluster gear having two gears axially paired attached to the countershaft by a shrink fit connection.

Abstract: A double clutch unit for a transmission, having an outer clutch pack and an inner clutch pack each having a clutch pack input and a clutch pack output, wherein a clutch unit input hub rotationally fixed to the outer clutch pack input side and the inner clutch pack input side, a clutch unit inner output hub attached in fixed rotational relation to the outer clutch pack output side, a clutch unit outer output hub attached in fixed rotational relation to an inner clutch pack output side, and an oil distributor rotationally fixed to the inner clutch pack input side, are axially slidable relative to a stator, and a spring-loaded bolt is attached to the engine side of a clutch unit inner power output shaft maintaining the inner output hub, clutch unit outer output hub and oil distributor in axial alignment with respect to the stator.