A transmission assembly may include a transmission housing; and a receiving space for receiving an electrical functional unit. The receiving space may be formed by at least one wall in the transmission housing and a lid unit, the receiving space may be sealable from an exterior environment via a seal in a contact region on the transmission housing and the lid unit. The lid unit may be connectable to the transmission housing by a screw, where the lid unit includes a channel through which at least part of the screw passes, and where the channel has an inner thread section.

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 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 steering system for a vehicle includes a housing, an input shaft, and a hybrid shaft support. The housing defines an opening. The input shaft is configured to rotate about an input axis. The hybrid shaft support may be disposed at the opening and configured to couple the input shaft to the housing. The hybrid shaft support may also be configured to support the input shaft as the input shaft rotates. The hybrid shaft support further includes a cylindrical member and a flexible seal over-molded onto the cylindrical member.

A strain wave gearing is provided with a lubricant sealing structure that prevents a lubricant from leaking to the outside through a gap between a hollow input shaft and an end plate. The lubricant sealing structure is provided with a labyrinth seal that seals the gap. The labyrinth seal is configured by a plurality of gap portions defined by an oil-repellent surface in which fine grooves are formed in a prescribed groove array pattern. The oil-repellent surface is also formed at an outer peripheral surface portion on an upstream side of the labyrinth seal. Leakage of a lubricant oil to outside of the device can be reliably prevented through the oil-repellent effect of the oil-repellent surface at the upstream side, the sealing effect of the labyrinth seal, and the oil-repellent effect from the oil-repellent surface of the labyrinth seal.

A strain wave gearing is provided with a lubricant sealing structure that prevents a lubricant from leaking to the outside through a gap between a hollow input shaft and an end plate. The lubricant sealing structure is provided with a labyrinth seal that seals the gap. The labyrinth seal is configured by a plurality of gap portions defined by an oil-repellent surface in which fine grooves are formed in a prescribed groove array pattern. The oil-repellent surface is also formed at an outer peripheral surface portion on an upstream side of the labyrinth seal. Leakage of a lubricant oil to outside of the device can be reliably prevented through the oil-repellent effect of the oil-repellent surface at the upstream side, the sealing effect of the labyrinth seal, and the oil-repellent effect from the oil-repellent surface of the labyrinth seal.

A transmission device is formed by combining a planetary gear-type reduction gear and a differential device, wherein at least one of first and second planetary gear portions in a two-stage planetary gear has gear teeth that receive a thrust load due to meshing with opposing gear, a power-transmission case formed by joining a carrier to a differential case is rotatably supported on a transmission case. A pivot shaft of the planetary gear has one end thereof on the first planetary gear portion side supported on the power-transmission case via a first bearing and the other end on the second planetary gear portion side supported on the power-transmission case via a second bearing, and the thrust loads on one side and on the other side in an axial direction are supported only by the first bearing among the first and second bearings. Thus, a wall portion of the power-transmission case pivotably supporting the second planetary gear portion is reduced in size in the radial direction, contributing to a reduction in size of the transmission case in the radial direction.

A transmission device is formed by combining a planetary gear-type reduction gear and a differential device, wherein at least one of first and second planetary gear portions in a two-stage planetary gear has gear teeth that receive a thrust load due to meshing with opposing gear, a power-transmission case formed by joining a carrier to a differential case is rotatably supported on a transmission case. A pivot shaft of the planetary gear has one end thereof on the first planetary gear portion side supported on the power-transmission case via a first bearing and the other end on the second planetary gear portion side supported on the power-transmission case via a second bearing, and the thrust loads on one side and on the other side in an axial direction are supported only by the first bearing among the first and second bearings. Thus, a wall portion of the power-transmission case pivotably supporting the second planetary gear portion is reduced in size in the radial direction, contributing to a reduction in size of the transmission case in the radial direction.

Systems and methods are provided for a gearcase of a motor and wheel set assembly configured to enclose a gear set, including a first case element, a second case element configured to mate with the first case element to contain lubricating oil for at least the gear set and a pinion, and a rubberized seal. In one example, a system may include permanent rubberized seals sealing an opening configured to receive the pinion, an interface between the first case element and the second case element and a bearing cap.

Systems and methods are provided for a gearcase of a motor and wheel set assembly configured to enclose a gear set, including a first case element, a second case element configured to mate with the first case element to contain lubricating oil for at least the gear set and a pinion, and a rubberized seal. In one example, a system may include permanent rubberized seals sealing an opening configured to receive the pinion, an interface between the first case element and the second case element and a bearing cap.