A gear drive assembly is used in an actuator. The gear drive assembly includes a housing and a gear arrangement including a drive gear, a driven gear, and one of a first selected gear and a second selected gear engageable with both of the drive and driven gears. The drive and driven gears and the first selected gear have a first gear ratio. The drive and driven gears and the second selected gear have a second gear ratio not equal to the first gear ratio. The internal surface of the housing defines first and second gear retention features to facilitate selective rotatable coupling of the first and second selected gears with the housing, respectively. A method of manufacturing the gear drive assembly includes the steps of selecting one of the first and second selected gears, engaging it with the drive and driven gears, and coupling it with the housing.

An automatic transmission is provided. The transmission includes clutches coaxially arranged in layers in a radial direction of the transmission. The transmission includes a piston provided to each clutch, the pistons being aligned in the radial direction on a same plane perpendicular to an axis of the transmission, without overlapping with each other in an axial view. The transmission includes a common rotational member having a wall, commonly used for the clutches, and disposed at a predetermined position of the transmission in an axial direction, wherein the wall is formed along the plane. The transmission includes operational hydraulic passages parallely arranged in the wall of the common rotational member in a circumferential direction of the transmission on the same plane perpendicular to the axis, each of the operational hydraulic passages communicating with one of operational hydraulic chambers of the respective clutches.

A power tool includes an output shaft for outputting torque, a motor for driving the output shaft to rotate about a first axis, a transmission mechanism for transmitting an output of the motor to the output shaft, a gear box for containing the transmission mechanism, a sleeve for a user to operate so as to adjust a maximum output torque transmitted from the motor to the output shaft, a locating element for limiting an axial position of the sleeve, fastening elements for fixing the locating element to the gear box, and a bearing for supporting the output shaft. The locating element is formed with a containing groove for containing the bearing and locating holes formed on a bottom of the containing groove. The fastening elements are at least partially embedded in the locating holes.

A power tool includes an output shaft for outputting torque, a motor for driving the output shaft to rotate about a first axis, a transmission mechanism for transmitting an output of the motor to the output shaft, a gear box for containing the transmission mechanism, a sleeve for a user to operate so as to adjust a maximum output torque transmitted from the motor to the output shaft, a locating element for limiting an axial position of the sleeve, fastening elements for fixing the locating element to the gear box, and a bearing for supporting the output shaft. The locating element is formed with a containing groove for containing the bearing and locating holes formed on a bottom of the containing groove. The fastening elements are at least partially embedded in the locating holes.

A parking lock system for a motor vehicle has a housing, a drive shaft couplable to a wheel of the motor vehicle, a locking element for non-rotatably connecting the drive shaft to the housing, an actuating element for actuating the locking element, a first adjusting disc and a second adjusting disc, which are both arranged rotatably around a common axis of rotation. The system also has an adjusting device for a rotational adjustment of the first adjusting disc, a first actuator coupled to the actuating element and to the second adjusting disc. The adjusting device transmits an actuating force from the first adjusting disc, via the second adjusting disc, first actuator, and actuating element to the locking element. The parking lock system has at least one spring device, which has a first end supported at least indirectly with respect to the first adjusting disc, and a second end supported at least indirectly with respect to the second adjusting disc.

A device for actuating a rotating shaft selected from a plurality of parallel rotating shafts, comprising a driving shaft supported and actuated by corresponding rotation means, which is provided with a driving gear for the transmission of torque, a plurality of driven shafts each one of which is provided with a corresponding driven gear that is designed to be meshed with the driving gear, the driven gears being arranged on the respective driven shaft in an axial position that is offset with respect to the other driven gears, the driving gear being capable of performing a translational movement axially with means of translational motion for alternate meshing with one of the driven gears, the device further comprising means of prevention of rotation for the driven shafts whose driven gear is not meshed with the driving gear.

A transmission actuator for tractor includes: a motor which provides power; rails which are movable by operating the motor; a rail sensor which detects a neutral state of the rails; a position sensor which detects a movement displacement of the rails; and a rotation sensor which is mounted to the motor to detect the number of revolutions of the motor.

A transmission actuator for tractor includes: a motor which provides power; rails which are movable by operating the motor; a rail sensor which detects a neutral state of the rails; a position sensor which detects a movement displacement of the rails; and a rotation sensor which is mounted to the motor to detect the number of revolutions of the motor.

Provided is a vehicle speed-change system including the following: a transmission; a transmission case that retains the transmission; a shift mechanism that performs a speed-change operation of the transmission; and a shift actuator that operates the shift mechanism. The shift actuator includes the following: a motor; a transmission mechanism that transmits rotation of the motor; and an actuator output shaft that outputs motive power transmitted by the transmission mechanism. The shift actuator is fixed to a side surface of the transmission case, and is arranged such that at least a portion of the motor overlaps the shift mechanism in a side surface view of the vehicle.

In one example, a portion of a transmission includes a first shaft, and a first gear cluster that includes a first group of coaxial nested gears that are movable in an axial direction relative to each other. The first group of coaxial nested gears includes a first gear that is fixed to the first shaft. The portion of a transmission further includes a self-centering mechanism that accommodates tolerance gaps between two successive gears of the first gear cluster.