This application provides a two-speed transmission system. The two-speed transmission system includes a first fixed gear fastened on a first shaft, a first floating gear connected to a second shaft through rotation, a first connection mechanism, and a one-way clutch. The first connection mechanism is configured to implement connection or disconnection between the first floating gear and the second shaft. The one-way clutch is located between the first floating gear and the first connection mechanism. An inner surface of the one-way clutch is connected to the first floating gear. An outer surface of the one-way clutch abuts against the first connection mechanism. The outer surface of the one-way clutch is connected to the first connection mechanism. An acting force of the outer surface directly acts on the first connection mechanism instead of a tooth surface of the first floating gear, to reduce an impact on accuracy of gear transmission.

Provided is an automatic transmission with which a large impact is hardly applied to the component of the switching mechanism or the switching control circuit when the drive source is re-driven. When a drive source ENG is determined to be in the stopped state, if the position of a slider HC1 does not correspond to the position the control part

ECU instructed before the drive source ENG is determined to be in the stopped state, the control part ECU of the automatic transmission TM transmits a signal for switching a two-way clutch TW to a state corresponding to the state of a slider HC1.

A control apparatus for a vehicle drive-force transmitting apparatus which defines a first drive-force transmitting path provided with a first clutch and a two-way clutch and a second drive-force transmitting path provided with a continuously variable transmission and a second clutch. The control apparatus switches the two-way clutch from its lock mode to its one-way mode, when the second drive-force transmitting path is to be established in place of the first drive-force transmitting path. The drive-force transmitting apparatus includes a hydraulic actuator configured to control switching of the two-way clutch between the lock mode and the one-way mode. When a request for establishing the second drive-force transmitting path in place of the first drive-force transmitting path is made during forward running of the vehicle with the two-way clutch being in the lock mode, the control apparatus executes a dither control for fluctuating a hydraulic pressure applied to the hydraulic actuator.

In the case of an axle drive unit with a power-shiftable two-speed transmission unit, in order to enable particularly simple and advantageous control of a gear change and to manage with a small number of components and a less complex control logic and control sensor system, the coordination of mechanically-passively implemented shifting thresholds of a friction clutch and a blocking device of a freewheel is provided, which makes it possible to control the friction clutch and the blocking device with the same control variable at always the same level.

A vehicle drive system including: a rotating electric machine; an output drivingly coupled to a wheel; a differential gear device provided in a power transmission path between the rotating electric machine and the output, the differential gear device including at least a first rotating element drivingly coupled to the rotating electric machine, a second rotating element drivingly coupled to the output, and a third rotating element that is selectively fixed by a one-way clutch to a non-rotating member and that is selectively fixed by a friction brake to the non-rotating member; and a clutch that selectively couples together two of the first rotating element, the second rotating element, and the third rotating element.

A vehicle drive-force transmitting apparatus including: a mode switching clutch; a torque converter; a lock-up clutch included in the torque converter; a switching solenoid valve configured to output a switching pressure for switching an operating mode of the mode switching clutch between a one-way mode and a lock mode; and a lock-up clutch control valve configured to switch an operating state of the lock-up clutch between an engaged state and a released state. The mode switching clutch is to be placed in the lock mode when the switching pressure is supplied from the switching solenoid valve to the mode switching clutch. The lock-up clutch control valve is configured to receive the switching pressure supplied from the switching solenoid valve, and to switch the operating state of the lock-up clutch to the released state when the switching pressure is supplied to the lock-up clutch control valve.

An apparatus for driving an electric vehicle and a method of controlling the vehicle are disclosed. The apparatus for driving the electric vehicle includes a driving motor, a motor shaft, a first motor gear, a second motor gear, a first driving gear, a second driving gear, a driving shaft, a first clutch, and a second clutch. The second clutch is a selective one-way clutch that functions as a bearing or a one-way clutch based on an operation of an actuator. The one-way clutch is configured to connect the second driving gear and the driving shaft based on a relative speed between the second driving gear and the driving shaft.

A vehicle drive system including: a rotating electric machine; an output drivingly coupled to a wheel; a differential gear device provided in a power transmission path between the rotating electric machine and the output, the differential gear device including at least a first rotating element drivingly coupled to the rotating electric machine, a second rotating element drivingly coupled to the output, and a third rotating element that is selectively fixed by a one-way clutch to a non-rotating member and that is selectively fixed by a friction brake to the non-rotating member; and a clutch that selectively couples together two of the first rotating element, the second rotating element, and the third rotating element.

In the case of an axle drive unit with a power-shiftable two-speed transmission unit, in order to enable particularly simple and advantageous control of a gear change and to manage with a small number of components and a less complex control logic and control sensor system, the coordination of mechanically-passively implemented shifting thresholds of a friction clutch and a blocking device of a freewheel is provided, which makes it possible to control the friction clutch and the blocking device with the same control variable at always the same level.

A control apparatus for a vehicle drive-force transmitting apparatus which defines a first drive-force transmitting path provided with a first clutch and a two-way clutch and a second drive-force transmitting path provided with a continuously variable transmission and a second clutch. The two-way clutch transmits a drive force during a driving state of the vehicle, and cuts off transmission of the drive force during a driven state of the vehicle when the two-way clutch is in its one-way mode. The two-way clutch transmits the drive force during the driving state and during the driven state when the two-way clutch is in its lock mode. An engine torque is increased in a case in which a request for switching the two-way clutch to the one-way mode is made during the driven state in forward running of the vehicle with the two-way clutch being in the lock mode.