A shift-by-wire system configured to switch shift positions includes a detent plate, a detent spring, a rotating electrical machine, a gear device, and an electronic control unit. The electronic control unit provided in the shift-by-wire system is configured to control a rotating electrical machine torque. The electronic control unit is configured to reverse the rotating electrical machine torque after the electronic control unit makes the rotating electrical machine output the rotating electrical machine torque for turning the detent plate in a turning direction to switch the shift position, then the detent torque generated in the detent plate by a push of the engagement portion is reversed in the turning direction from a counter-turning direction opposite to the turning direction, and before backlash elimination in a backlash portion of the gear device by the reversed detent torque is finished.

[Problem] To provide a planetary gear assembly that, while increasing the speed change range of a power-split stepless transmission formed in cooperation a stepless transmission, can reduce the overall size of the power-split stepless transmission. [Solution] The planetary gear assembly according to the present invention includes: a cylindrical transmission shaft, an output shaft inserted into the transmission shaft, first and second planetary gear mechanisms each having a first sun gear supported to the transmission shaft without a relative rotation about an axial line, first and second clutch mechanisms that are placed coaxially with the transmission shaft, and that engage and disengage a power transmission of power to standard rotary speed power input units of the first and second planetary gear mechanisms, and a connection member extrapolated to the transmission shaft with a free relative rotation about an axial line. The connection member, without a relative rotation around an axial line, connects, within the first planetary gear mechanism, a planetary element that is other than a sun gear and a planetary element that forms a standard rotary speed power input unit, with, within the second planetary gear mechanism, a planetary element that is other than a sun gear and a planetary element that forms a standard rotary speed power input unit, and the connection member, meanwhile, is non-rotatable relative to the output shaft about an axial line.

A transmission assembly for a hydrostatically or electrically propelled vehicle, comprising an input shaft, an output shaft, a first pair of gears and a second pair of gears, a synchroniser, a hydraulically operated actuator of the synchroniser which comprises a rod, and a hydraulic circuit for moving the rod, wherein the rod comprises an enlarged portion that is slidingly and sealingly housed in a respective portion of the seat so as to define two intermediate chambers. The actuator further comprises a contact element that is slidingly and sealingly housed in a relevant seat that is adjacent to the portion of the sliding seat so as to define a first end chamber, the contact element being able to move independently of the rod and defining an end point of the rod. A second end chamber is defined in an end of the rod that is opposite the enlarged portion.

The disclosure relates to a method of controlling a dog clutch by a DC motor configured to move the dog clutch via an actuator arm). The dog clutch including at least one gear having one or more dogs configured to engage one or more dogs of a sliding sleeve). The method includes supplying the DC motor with a pulse width modulated voltage having a duty cycle which is provided by a control algorithm). The control algorithm includes a trajectory planner generating a desired position of the actuator arm based on a 4.sup.th order trajectory planning algorithm and a motion controller based on the sliding mode theory for tracking the desired arm position.

A parking brake actuation system mounted to a tail shaft of a vehicle's transmission is operably connected to a brake assembly of the vehicle having brake pads housed within a brake drum. The parking brake actuation system includes a mounting bracket coupled to the tail shaft of the vehicle's transmission, an actuator coupled to the mounting bracket, and a bell crank coupled to the tail shaft of the vehicle's transmission and the actuator, and also connected to an engagement cam by a linkage assembly. Actuation of the actuator to a retracted position permits rotational movement of the bell crank to transfer through the linkage assembly to engage the pair of brake pads with the brake drum. Actuation of the actuator to an extended position permits rotational movement of the bell crank to transfer through the linkage assembly to disengage the pair of brake pads from the brake drum.

A transmission for a machine is disclosed. The transmission may comprise a first torque path for transmission of torque from an input shaft to an output shaft, and a single clutch element along the first torque path. The transmission may further comprise a clutch actuator configured to actuate engagement of the clutch element, and a clutch pressure control (CPC) valve configured to permit a flow of hydraulic fluid to the clutch actuator when in an open position to cause the clutch actuator to actuate engagement of the clutch element. The transmission may further comprise a FMR valve having a failure position obstructing flow of the hydraulic fluid from the CPC valve to the clutch actuator when the CPC valve is in the open position. The FMR valve actuated by pilot pressure from a CPC valve that controls actuation of other clutch elements that are not on the first torque path.

The present disclosure describes a hydraulic control system comprising a first pressure chamber and a second pressure chamber, each pressure chamber configured to receive a hydraulic fluid, a first movable member configured to assume a position depending on a hydraulic pressure of the hydraulic fluid in the first pressure chamber and a second movable member configured to assume a position depending on a hydraulic pressure of the hydraulic fluid in the second pressure chamber, a hydraulic command circuit configured to provide the hydraulic fluid and to control the hydraulic pressure of the hydraulic fluid in the first pressure chamber and/or the second pressure chamber, having a switchable valve in fluid communication with the first pressure chamber, wherein the switchable valve is configured to be pilotable depending on the hydraulic pressure of the hydraulic fluid in the second pressure chamber.

A method to control the execution of a shift to a lower gear with a released accelerator pedal in a drivetrain provided with a dual-clutch, servo-assisted transmission; the following steps are provided: opening, in a first instant, an outgoing clutch; closing, in the first instant, an incoming clutch; completing the opening of the outgoing clutch with a first linear ramp in a second instant; synchronizing, between the second instant and a third instant, a rotation speed of the internal combustion engine with a rotation speed of the incoming clutch; closing of the incoming clutch with a second linear ramp starting from a fourth instant, which is prior to or coincides with the second instant; completing the closing of the incoming clutch in a fifth instant, which coincides with or is subsequent to the second instant; and activating the internal combustion engine so as to generate a torque between the fourth instant and the third instant.

A gear shifting device, a transmission, and an all-terrain vehicle are disclosed. The gear shifting device includes: a drive motor having an output shaft fixed with a driving toothed wheel; a transmission drum having a first end fixed with a driven toothed wheel and a second end provided with a gear contactor; a gear sensor having a working surface in contact with the gear contactor; and an electronic control unit electrically coupled to the drive motor. The electronic control unit outputs a drive signal to the drive motor based on a gear shifting instruction, the drive motor rotates based on the drive signal, and the output shaft drives the driving toothed wheel to rotate; the transmission drum and the driven toothed wheel rotate along with rotation of the driving toothed wheel; and the gear contactor rotates to contact one of four contacts corresponding to the gear shifting instruction.

Disclosed is a method for operating a multi-gear vehicle transmission having a plurality of shifting elements (A, B, C, D, E) for engaging the gears of the vehicle transmission, where, in a neutral gear an input (AN) and an output (AB) of the vehicle transmission are decoupled from one another, and where, in a driving gear the input (AN) and the output (AB) of the vehicle transmission are coupled to one another in order to propel the vehicle, by closing at least one shifting element (B). When the neutral gear is engaged, at least an actuation condition of a vehicle brake (11) and a transmission condition with elevated drag losses are detected, where, when the neutral gear is engaged, the shifting element (B) for the driving gear is vented if it is recognized that the vehicle brake (11) has been released and the transmission condition with elevated drag losses pertains.