A lubricating oil supply structure in an in-wheel motor drive device (10) includes an oil tank (47) provided a lower part of a motor unit (21) and/or a reducer unit (31), configured to store lubricating oil, an oil pump (54) configured to pump up lubricating oil from the oil tank, and an oil pipe (70) fixedly attached in an upper part of the motor unit and/or the reducer unit. The oil pipe (70) includes an inlet (76) through which lubricating oil pumped up from the oil pump (54) flows therein, and at least one outlet (77) provided between one end thereof and the other end thereof, configured to discharge lubricating oil flown in from the inlet (76) downwards.

A system for cooling and lubricating a rotor shaft bearing of an electric machine is provided. In one example, the system includes a plurality of oil passages that extend axially through a rotor shaft and open into a sealed cavity near a housing interface between an electric machine housing and gearbox housing to route oil to the rotor shaft bearing for cooling and lubrication thereof.

A gear unit to be mounted in a vehicle includes a housing for storing oil, a partition disposed inside the housing, and a helical gear. The partition defines first and second oil chambers and has a through-hole allowing the first oil chamber to communicate with the second oil chamber. The helical gear disposed inside the first oil chamber rotates during running of the vehicle and has an angled tooth that draws inner and addendum circles defining a virtual circumferential plane. The through-hole coincides with a portion of the virtual circumferential plane in a direction parallel to a central axis of the helical gear. When the helical gear rotates in conjunction with the running of the vehicle, the oil flows from the second oil chamber into the first oil chamber so that an oil level of the first oil chamber becomes higher than that of the second oil chamber.

Disclosed is a driving system having an oil circulation structure in which churned oil is collected in a housing and in which the collected oil is efficiently distributed to driving structures, which include a motor and a speed reducer, thereby smoothly cooling and lubricating the respective driving structures. In addition, it is possible to adjust the level of the oil depending on whether the driving structures are in a low-load state or a high-load state, thereby improving lubrication and cooling performance.

A vehicle includes a motor, a gear mechanism connected downstream of the motor, a box that has a motor chamber that houses the motor, a gear chamber that houses the gear mechanism and lubricating oil, and an exhaust pipe. A first cooling box, in which cooling liquid that cools the motor is introduced, is configured on an outer circumference of the motor. A second cooling box, which is connected so that cooling liquid can circulate between the second cooling box and the first cooling box, is configured on an outer circumference of the box. The motor chamber is arranged at a position spaced further apart from the exhaust pipe than the gear chamber.

Provided is a cooling structure of a vehicle, which suppresses air stagnation in the motor when manufacturing, and improves productivity, while maintaining cooling efficiency of a motor. A cooling structure of a vehicle is equipped with a first cooling circuit (41) configured to cool an engine; and a second cooling circuit (42) configured to cool a motor (3) and an electric device including an inverter which connects the motor (3) and a power storage device, in which the first cooling circuit (41) has a first motor internal flow path (20) provided in a motor case (12), the second cooling circuit (42) has a second motor internal flow path (30) provided in the motor case (12), the second motor internal flow path (30) has a circumferential flow path (33) configured to allow a refrigerant (S) to flow along a circumferential direction of the motor (3), an inlet pipe (34) configured to allow the refrigerant (S) to flow into the circumferential flow path (33), and an outlet pipe (35) configured to discharge the refrigerant (S) from the circumferential flow path (33), and the inlet pipe (34) is disposed to be closer to the first motor internal flow path (20) side than the outlet pipe (35).

A lubricant supported electric motor includes a static member and a movable member movably disposed within the static member to define a gap therebetween. The static member may be configured as a stator and the movable member may be configured as a rotor. The movable member may also be configured to move relative to the static member. The static member and movable member are configured to exert an electromagnetic force therebetween and convert electrical energy into mechanical energy and move the movable member. A lubricant is disposed in the gap between the static member and the movable member to support the movable member relative to the static member.

A drive assembly includes: a reduction gearbox including a reduction gearbox housing, a reduction gearbox input shaft, and a reduction gearbox output component, the reduction gearbox input shaft and the reduction gearbox output component being drivingly connected to each other and arranged in the reduction gearbox housing; a motor including a motor housing, a motor stator, and a motor rotor, the motor stator being arranged in the motor housing and fixedly connected to the motor housing, the motor rotor being arranged in the motor stator, the motor rotor including a motor output shaft drivingly connected to the reduction gearbox input shaft; and an axle including an axle housing and an axle input shaft arranged in the axle housing, the axle input shaft being drivingly connected w the reduction gearbox output component. The motor housing and the axle housing are fixedly connected to the reduction gearbox housing.

An electric drive assembly with oil/water dual cooling is provided that includes a motor module, a gearbox module, a water cooling module and an oil cooling module. Lubricating oil is introduced into the front and rear windings of the motor through three oil conveying passages to improve the cooling performance of the motor. Moreover, the gearbox cavity and the motor cavity do not need to be sealed, which avoids the use of high-speed oil seal of motor shaft, and thus the cost of the drive assembly is reduced and the transmission efficiency is improved. The cooling fluid of the motor cools the lubricating oil through the heat exchanger of the gearbox, thereby solving the heat dissipation problem when the gearbox of the new energy vehicle operates at high speed constantly, and thus improving the service life and reliability of the gear and bearing.

A powertrain assembly includes one or several electric motors, a gearbox comprising a gearbox housing, an axle comprising: an axle housing, movable parts inside axle housing, comprising a shaft for a wheel, a lubricating system comprising an axle lubricating device comprising an axle oil sump and a gearbox lubricating device comprising a gearbox oil sump inside the gearbox housing which is a dry sump having an oil storage area which is separate from said gearbox oil sump, a scavenge pump and a first duct configured to retrieve oil from gear box oil sump and to convey the retrieved oil up to the oil storage area, and a main pump and a second duct configured to convey oil from the storage oil area to lubricate the gears of the gearbox.