A two-speed transmission for an electric vehicle includes a planetary gear set selectively coupling an input shaft and an output shaft. The planetary gear set is configured to provide two forward gear ratios and neutral. The planetary gear set includes at least one sun gear, at least one pinion in meshing engagement with the at least one sun gear, at least one ring gear meshingly engaged with the at least one pinion, and a carrier. The carrier supports the at least one pinion and is connected to the output shaft such that rotation of the carrier drives the output shaft. The two-speed transmission also includes one or more elements that rotatably couple the at least sun gear, the at least one pinion, the at least one ring gear, the input shaft, and the carrier with one another and/or a ground. Examples of such elements include clutches, brakes, and mechanical diodes.

Methods and systems for a gearbox are provided. A multi-speed gearbox system in an electric vehicle includes, in one example, a planetary assembly designed to rotationally coupled to an electric machine and including a first planetary gear set that is rotationally coupled to a second planetary gear set that includes a first set of pinion gears and a second set of pinion gears. The multi-speed gearbox system further includes a first clutch designed to selectively ground a first component in one of the first planetary gear set and the second planetary gear set.

A drive assembly for a work vehicle has a drive housing including at least one housing element forming a reaction member, a drive shaft rotatable about a drive axis, and a planetary gear set coupled to the drive shaft and configured to selectively rotate an output element. The drive assembly also includes at least one clutch arrangement having at least one clutch ring configured to selectively interact with the planetary gear set to effect a rotation speed of the output element. At least one actuator is configured to axially drive the clutch ring along the drive axis. A retention mechanism is configured to retain the clutch ring at an axial position along the drive axis. The retention mechanism includes a detent ball, a detent groove and a resilient member configured to urge the detent ball into the detent groove to retain the clutch ring at the axial position.

A speed changer includes a transmitting mechanism and at least one speed-increasing mechanism. The transmitting mechanism includes a primary sun gear mounted by a one-way bearing a fixed shaft. The primary sun gear is in mesh engagement with primary planetary gears rotatably mounted to an output frame and in mesh engagement with an inner circumference of a toothed ring. The speed-increasing mechanism is rotatably mounted by a tubular shaft to the fixed shaft. The tubular shaft is provided with a sun gear having a diameter smaller than the primary sun gear. Planetary gears in mesh engagement with the sun gear are rotatably mounted on the output frame and are combined with and synchronously rotatable with the primary planetary gears. The tubular shaft of the speed-increasing mechanism is provided with an arresting assembly to selectively stop rotation of the tubular shaft.

A two-speed drive unit of an electric vehicle includes a planetary gear set transmission having multiple elements including a first element, a second element and a third element. A motor generator unit supplies a motive force to the planetary gear set transmission. A first stage gear transfers the motive force to the planetary gear set transmission from the motor generator unit. A second stage gear is connected through the second element to a final drive. A first torque transmitting device defining a selectable one-way clutch (SOWC) is connected to the third element.

A vehicle drive device includes a rotating electrical machine, an output member, and a reduction planetary gear device. The output member and the reduction planetary gear device are coaxially disposed side by side. The reduction planetary gear device includes a third rotating element that is selectively fixed to a case by an engagement device. A support bearing that rotatably supports the third rotating element is radially supported by the output member.

An automatic transmission is arranged in a hybrid driveline employing an EV mode and an HEV mode, and establishes transmission ratio positions by engaging or disengaging frictional elements. A system or method includes: determining, based on a vehicle deceleration and a relationship between a requested transmission ratio position and an actual transmission ratio, whether or not interlocking is occurring, when the automatic transmission is in a state out of transmission shifting, wherein the interlocking is due to erroneous engagement of one of the frictional elements; and inhibiting the determination about interlocking, during a period from start of slip of a first frictional element of the automatic transmission to confirmation of convergence of slip of the first frictional element, in a situation that the first frictional element is slip-engaged for starting the engine in response to a request for mode transition from the EV mode to the HEV mode.

A two-speed transmission for an electric vehicle includes a planetary gear set selectively coupling an input shaft and an output shaft. The planetary gear set is configured to provide two forward gear ratios and neutral. The planetary gear set includes at least one sun gear, at least one pinion in meshing engagement with the at least one sun gear, at least one ring gear meshingly engaged with the at least one pinion, and a carrier. The carrier supports the at least one pinion and is connected to the output shaft such that rotation of the carrier drives the output shaft. The two-speed transmission also includes one or more elements that rotatably couple the at least sun gear, the at least one pinion, the at least one ring gear, the input shaft, and the carrier with one another and/or a ground. Examples of such elements include clutches, brakes, and mechanical diodes.

An electric vehicle driving device includes a first motor, a second motor, a transmission device to which power of at least one of the first motor and the second motor is transmitted, and an output member that rotates with power output from the transmission device. A rotation axis of the first motor, a rotation axis of the second motor, and a rotation axis of the transmission device are arranged in parallel to a rotation axis of the output member. When seen from an axial direction parallel to the rotation axis of the output member, the rotation axis of the first motor is located on one side of a straight line passing through the rotation axis of the output member and the rotation axis of the transmission device and the rotation axis of the second motor is located on the other side of the straight line.

An automatic transmission includes: first, second, and third planetary gear sets each having three rotating elements; seven coupling elements variably providing a frictional force; and seven shafts. In particular, a first shaft is fixedly connected to a second rotating element of the third planetary gear set and an input shaft, a third shaft is fixedly connected to a third rotating element of the second planetary gear set, a fourth shaft is fixedly connected to a first rotating element of the second planetary gear set and a third rotating element of the third planetary gear set, a sixth shaft is directly connected to a first rotating element of the third planetary gear set and a transmission casing, a seventh shaft is fixedly connected to a third rotating element of the first planetary gear set and an output shaft, and remaining two shafts are selectively fixed to the transmission casing.