A motor drive unit having an electromagnetic brake serving as an inboard brake that may also be used as a parking brake is provided. In the motor drive unit, output torque of a drive motor is distributed to a first driveshaft and a second driveshaft. The motor drive unit comprises: an electromagnetic brake device that stops rotation of an output shaft by contacting a brake stator to a brake rotor; a brake motor that generates torque when energized; and an engagement force generating device that generates an engagement force to engage the brake member with the rotary member when the output torque of the brake motor is applied thereto, and that maintains the engagement between the brake member and the rotary member when current supply to the electromagnetic brake device and the brake motor is stopped.

An electric axle is configured to selectively enable an electric motor to power a pair of drive shafts of a vehicle. The electric axle includes a planetary gearset configured to drivably couple an electric motor with first and second drive shafts coaxially arranged. The planetary gearset including a ring gear. A housing at least partially surrounds the planetary gearset and is configured to be grounded to the vehicle. A clutch is configured to selectively ground the ring gear with the housing to enable an electric motor to power the first and second drive shafts. The electric axle may include a second planetary gearset, namely a differential planetary gearset. The differential planetary gearset may include a carrier that is shared or common amongst the planetary gearset and the differential planetary gearset.

Drive device for a motor vehicle, includes a differential for distributing a torque that can be supplied via a drive shaft to two output shafts and a superimposition gear coupled with the differential one of the output shafts and an additional motor for superimposing torques supplied from the output shaft, from the differential and from the additional motor, wherein the differential is coupled via a torque reducing transmission ratio device with the superimposition gear, wherein the superimposition gear includes a switching device that can be controlled with a control device, wherein the superimposition gear superimposes in a first switching mode torques supplied to the switching device from the output shaft.

A downsized torque vectoring device in which a passive rotation of an actuator is prevented. A torque vectoring device comprises: a differential mechanism that allows a differential rotation between a first rotary shaft and second rotary shaft; an actuator that applies torque to the differential mechanism to rotate the rotary shafts at different speeds; and a reversing mechanism that allows the rotary shafts to rotate in opposite directions. The reversing mechanism comprises a first control gear set and the second rotary shaft arranged coaxially around the rotary shafts, and gear ratios of the first control gear set and the second control gear set are set to different values. A speed increasing gear set and a speed reducing gear set are arranged between a prime mover and an output shaft of the actuator, and ring gears of the speed increasing gear set and the speed reducing gear set are connected to each other.

A torque vectoring device for preventing an unintentional relative rotation between the right wheel and the left wheel is provided. The torque vectoring device comprises: a drive motor; a differential unit formed of planetary gear units; a differential motor that applies torque to any one of reaction elements of the planetary gear units; a torque reversing mechanism transmitting torque of the first reaction element to the second reaction element while reversing; a rotary shaft connecting input elements of the planetary gear units; a first rotary member fitted onto an output shaft of the differential motor; and a differential action restricting mechanism for pushing a pushing member onto the first rotary member thereby applying brake torque to the output shaft of the differential motor.

A power transmission mechanism includes a first pinion gear meshed with a first sun gear coupled to a first output shaft; a second pinion gear meshed with a second sun gear coupled to a second output shaft and meshed with the first pinion gear; a differential case coupled to an input shaft and supporting the first and second pinion gears; an internal gear rotatable about the axes of the first and second output shafts; a motor generator coupled to the internal gear; a first one-way clutch including a first inner ring member configured to move in conjunction with the first pinion gear and a first outer ring member meshed with the internal gear; and a second one-way clutch including a second inner ring member configured to move in conjunction with the second pinion gear and a second outer ring member meshed with the internal gear.

A compact planetary differential gear set includes first (130A) and second (130B) sun gears, a first set (200A) and a second set (200B) of planet gears (220), and a carrier (160) with a ring gear (190). Enmeshing gear pairs (210) are formed from one planet gear from each set. The first and second planet gear sets enmesh the first and second sun gears, respectively. The ring gear does not extend into an annular region containing the planet gears thereby allowing four or more gear pairs to compactly fit into the annular region. The carrier is a weldment and substantially encloses the sun gears and the planet gears permanently. The differential requires no fasteners or post-weld machining and may have a higher capacity, lower cost, smaller size, lower part number count, and/or lower amounts of material compared with conventional differentials. The differential is suited for motor vehicle applications.

A planetary transmission (1) with a differential (3) and at least one set of planetary gears (6) and with a common planetary carrier (9) for the differential (3) and the set of planetary gears (7) and with at least one set of planet journals (18). The planet journals (7) and first differential gears (11) of the differential (3) are seated so as to follow one another axially on in each case one planet journal (18) and, here, are axially separated from one another by way of the intermediate web (20). The intermediate web (20) which extends in radial directions runs axially between a first toothing plane (I) and a second toothing plane (II).

A vehicle differential apparatus including a pair of side gears arranged side by side along an axial line, a set of pinion gears disposed on a radial outside of the side gears so as to engage with the side gears and engaged with each other, and a housing forming a housing space of the pinion gears to rotate integrally with the pinion gears. Each of the side gears includes an inner and outer side gears, the inner and outer side gears include a first and second splines extended along helical gears formed on an outer and inner circumferential surfaces of the inner and outer side gears, respectively, and engaging with each other, and the helical gear of the first spline is formed so as to be crowned along a tooth trace thereof.

A differential actuator including: a shuttle supported for rotation around a central axis and including a body portion, a first pinion gear connected to the body portion, and a second pinion gear connected to the body portion; a first component including a first plurality of teeth meshed with the first pinion gear and supported for rotation around the central axis; and a second component including a second plurality of teeth meshed with the second pinion gear and supported for rotation around the central axis. For a first operating mode of the differential actuator: the shuttle is arranged to be rotated by an actuator in a first circumferential direction around the central axis; and the first pinion gear is arranged to rotate the first component in the first circumferential direction around the central axis.