Abstract: Methods and systems for cooling an electric motor are provided. An electric motor system, in one example, comprises a rotor with a plurality of axial air conduits, a first balancing plate positioned on a first axial side of the rotor, the first balancing plate comprising an inlet air duct and an outlet air duct, and a second balancing plate positioned on a second axial side of the rotor, the second balancing plate comprising an inlet air duct and an outlet air duct. In the electric motor system, the inlet air duct in the first balancing plate is radially offset from the inlet air duct in the second balancing plate.

Abstract: Methods and systems for lubricating a rotating shaft are provided. The lubrication system, in one example, includes a pump coupled to a central lubricant channel, the rotating shaft having a plurality of channels, an air intake channel positioned parallel to an axis of rotation of the rotating shaft, and a first orifice of a first channel of the plurality of channels, where the first orifice is positioned between the air intake channel and the central lubricant channel.

Abstract: An electric motor and inverter assembly and a method of assembly therefor, the electric motor and inverter assembly having a motor housing portion, a DC bus bar for electrically connecting a DC power source to an inverter power module where the DC bus bar is mounted on the housing portion, and a cooling channel disposed in between the housing portion and the DC bus bar for cooling the DC bus bar.

Abstract: The present document relates to an electric drive unit, comprising: a stator configured to produce a stator magnetic field, at least a first rotor including first rotor windings, the first rotor windings for instance including multi-phase windings, and at least a first inverter electrically connected with the first rotor windings and configured to produce an electric current in the first rotor windings for producing a first rotor magnetic field. The stator magnetic field is configured to interact with the first rotor magnetic field to exert a torque on the first rotor. The present document further relates to a method of operating the electric drive unit.

Abstract: Methods and systems for a vehicle transmission are provided herein. The vehicle transmission includes an input interface configured to mechanically couple to a motive power source. The vehicle transmission further includes a first disconnect device releasably mechanically coupling a first output to a first drive axle and a second disconnect device releasably mechanically coupling a second output to a second drive axle.

Abstract: Disclosed herein are power conversion devices comprising power modules, capacitor modules, and support frames. The power modules may be operable to convert direct current (DC) electricity to alternating current (AC) electricity. The capacitor modules may be electrically connected to the power modules. The support frames may house the power modules and conductor plates, and the capacitor modules may be at least partially wound around exterior sides of the support frames. Such arrangements may advantageously take up less installation space and/or have better form factors than power conversion devices with cylindrical capacitors.

Abstract: Various methods and systems are provided for a system for cooling an electric motor that includes a rotor shaft rotatably mounted inside a motor housing, a lamination stack integrally connected to the rotor shaft, an encoder-end balance plate integrally connected to a first end of the lamination stack and a first end of the rotor shaft, an output-end balance plate integrally connected to a second end of the lamination stack and a second end of the rotor shaft, an oil supply coupled to the output-end balance plate and the rotor shaft. A closed-looped coolant pathway is formed between the transmission, the rotor shaft, the encoder-end balance plate, the lamination stack, and the output-end balance plate.

Abstract: A dual-motor transmission therefor, comprising a first and a second electric traction motor, a first gear arrangement, a second gear arrangement, and a summation box. The first gear arrangement includes a shaft and at least a first gear and a second gear, wherein each of the first and the second gears can be selectively engaged and disengaged with the shaft via a clutch, and the first gear arrangement supplies a first torque from the first motor to the summation box. The second gear arrangement includes a shaft and at least a first gear, wherein the first gear can be engaged and disengaged with the shaft via a clutch, and the second gear arrangement supplies a second torque from the second motor to the summation box, and the summation box is configured to combine the first and second torques and to output a combined output torque.

Abstract: Systems and methods for a power take-off (PTO) assembly. The PTO assembly, in one example, includes a bi-directional pump in fluidic communication with a fluid reservoir and a hydraulic system and a disconnect clutch configured to mechanically disengage and disconnect the bi-directional pump from a transmission when a prime mover is in operation, and mechanically engage and connect the bi-directional pump to the transmission when the prime mover is shut down. The PTO assembly further includes an electro-mechanical valve configured to trigger engagement and disengagement of the disconnect clutch.

Abstract: A torque convertor and direct drive unit arrangement and operating methods are provided herein. In one example, a prime mover may be configured to be coupled to a transmission via one of a torque convertor and a direct drive unit, the direct drive unit including a higher range clutch and a lower range clutch.

Abstract: Methods and systems are provided for providing cooling to an electric motor via direct spray cooling. In one example, a system may include a shaft including an oil conduit extending axially therein and a plurality of openings fluidically coupling the oil conduit to an external surface of the shaft; a rotor positioned coaxial with the shaft, an inner diameter of the rotor greater than an outer diameter of the shaft; and a gas-filled chamber bounded by an inner surface of the rotor and the external surface of the shaft, the gas filled chamber fluidically coupled to the oil conduit via the plurality of openings, and a pressure of a gas in the gas-filled chamber lower than a pressure of oil in the oil conduit.

Abstract: Methods and systems for an electric driveline are provided. In one example, the electric driveline system includes a transmission with a planetary gearset, with a first gearset component rotationally coupled to a first electric machine and a second electric machine, and a first output interface and a second output interface rotationally coupled to a first axle and a second axle, respectively, and a second gearset component in the planetary gearset. The driveline system further includes a first friction clutch configured to selectively brake a third gearset component and a second friction clutch configured to selectively couple the first gearset component to an output shaft.

Abstract: Systems and methods for a sun gear, counter bearing parts, and bearing arrangements. The gear comprising a helical toothing and a first and a second thrust surface which are configured to axially support the sun gear at a first and a second counter thrust surface, respectively, wherein the first and the second thrust surface have a thrust generating geometry that is configured to build up a lubrication fluid film between the first thrust surface and the first counter thrust surface and between the second thrust surface and the second counter thrust surface during rotation of the sun gear. The counter bearing part for axially supporting a sun gear, and to a bearing arrangement for axially supporting a sun gear.

Abstract: The present document relates to a method of disengaging a clutching device. The method comprises sweeping an output torque of an electric motor drivingly connected to the clutching device such that a torque transmitted by the clutching device vanishes at least temporarily during the sweep, and disengaging the clutching device during the sweep. The present document further relates to an electric driveline for carrying out the method.

Abstract: Systems and methods for an electric drive unit are provided. A transmission system in an electric drive unit includes first, second, and third input shafts rotationally coupled to first, second, and third electric machines, respectively, wherein the first and third electric machines are arranged on a first side of the transmission and the second electric machine is arranged on a second opposing side of the transmission. The transmission system further includes an idler shaft that connects the first, second, and third electric machines and couples to a sun gear of a planetary gear set. The planetary gear set is arranged between a first and second clutch wherein the first clutch couples to a carrier and the second clutch couples to a ring gear. An output shaft is spaced away from the planetary gear set via gear and includes two flanges to couple the transmission to outputs.

Abstract: Methods and systems are provided for wet clutch pressure control to reduce drag and degradation of rotary seals in a transmission. In one example, a method may include determining an upper threshold pressure based on a rotational speed of a shaft of the transmission, determining a lower threshold pressure based on the rotational speed of the shaft, and adjusting a pressure of hydraulic fluid applied to the clutch to be between the upper threshold pressure and the lower threshold pressure. In this way, the pressure of the hydraulic fluid applied to the clutch may be maintained at a level that allows full torque transfer by the wet clutch while reducing drag on the rotary seals.

Abstract: An electric driveline, comprising at least a first and a second electric machine, at least a first and a second output, and at least a first planetary gear set including three drivingly connected components including a sun gear, a planetary carrier and a ring gear. The first and the second electric machine are drivingly connected or connectable with the first and the second output via the first planetary gear set. At least one of the first and the second electric machine is selectively connected with the same one of the three components of the first planetary gear set via at least two different gear ratios, and/or the same one of the three components of the first planetary gear set is selectively connected with each of the first and the second output via at least two different gear ratios. The disclosure further concerns a method of operating an electric driveline.

Abstract: Methods and systems are provided for a transmission. In one example, the transmission may include a brake system arranged in-line with a second brake along a longitudinal axis of the transmission. Each brake may have a plurality of separator plates which may be secured to a housing of the transmission by at least one pin. The brake system may further include an end plate positioned between the first brake and the second brake, the end plate secured to the housing by a plurality of dowel pins.

Abstract: A transmission, such as a transmission for a vehicle, a driveline including the transmission, and a method of performing a gear shift using the transmission. The transmission comprises a first transmission shaft, a first gear disposed on the first transmission shaft, a first wet clutch, and a first synchronizer. The first wet clutch and the first synchronizer are configured to selectively drivingly engage the first gear with the first transmission shaft and are connectable in series between the first gear and the first transmission shaft, such that the first gear is drivingly engaged with the first transmission shaft only when both the first wet clutch and the first synchronizer are engaged, and such that the first gear is drivingly disengaged from the first transmission shaft when either one or both of the first wet clutch and the first synchronizer is/are disengaged.

Abstract: A clutch assembly may have an axially slidable first plate, an axially fixed second plate disposed opposite the first plate, and a clutch pack arranged between the first plate and the second plate. The clutch pack may have a number of axially slidable consecutively arranged friction plates and separator plates. The assembly may also have an actuator axially movable between a first position and a second position, where, in the first position, the clutch pack is opened and, in the second position, the clutch pack is closed and the friction plates are frictionally engaged. The assembly may also have a return spring configured to bias the actuator in a direction away from the clutch pack towards the first position. The assembly may also have an engagement spring element configured to exert an elastic force on the clutch pack.