Transmission unit for motor vehicles with reverse drive and motor vehicle comprising the transmission unit
AssigneePiaggio & Co. S.P.A.
InventorsPaolo Nesti, Stefano Doveri
Life of this patent
Estimating the term…
Abstract
The transmission unit (15) for motor vehicle (1) comprises a shaft (23) of the driving wheel, operatively connected to a main drive (19, 97) to control forward drive, and a reverse drive electric motor (21). The transmission unit further comprises a control bushing (47) rotated by the reverse drive electric motor (21), and a driven transmission bushing (63), operatively connected to the shaft (23) of the driving wheel. An actuator (121) is provided for controlling mutual coupling between the control bushing (47) and the driven transmission bushing (63) to transmit the motion of the reverse drive electric motor (21) to the shaft (23) of the driving wheel.
Claims27
A transmission unit with a continuously variable transmission, for a motor vehicle, the transmission unit comprising:
- a shaft of a driving wheel operatively connected to a main drive to control forward drive;
- a reverse drive electric motor;
- a control bushing rotated by the reverse drive electric motor;
- a driven transmission bushing, operatively connected to the shaft of the driving wheel;
- an actuator for controlling mutual coupling between the control bushing and the driven transmission bushing to transmit the motion of the reverse drive electric motor to the shaft of the driving wheel;
- and
- a driven pulley of the continuously variable transmission, coaxial to the shaft of the driving wheel and around which a transmission belt of the continuously variable transmission is guided.
A motor vehicle comprising:
- a driving wheel;
- and
- a transmission unit comprising:
- a shaft of the driving wheel operatively connected to a main drive to control forward drive;
- a reverse drive electric motor;
- a control bushing rotated by the reverse drive electric motor;
- a driven transmission bushing, operatively connected to the shaft of the driving wheel;
- an actuator for controlling mutual coupling between the control bushing and the driven transmission bushing to transmit the motion of the reverse drive electric motor to the shaft of the driving wheel;
- a driven pulley of the continuously variable transmission, coaxial to the shaft of the driving wheel and around which a transmission belt of the continuously variable transmission is guided;
- and
- an internal combustion engine operatively connected to the driving wheel by means of the main drive of the transmission unit.
A transmission unit with a continuously variable transmission, for a motor vehicle, the transmission unit comprising:
- a shaft of a driving wheel operatively connected to a main drive to control forward drive;
- a reverse drive electric motor;
- a control bushing rotated by the reverse drive electric motor;
- a driven transmission bushing, operatively connected to the shaft of the driving wheel;
- and
- an actuator for controlling mutual coupling between the control bushing and the driven transmission bushing to transmit the motion of the reverse drive electric motor to the shaft of the driving wheel, wherein the control bushing is torsionally coupled to a selector, which is axially movable with respect to the control bushing and functionally coupled to the actuator, wherein the selector comprises first engaging toothing, adapted to co-act with second engaging toothing integral with the driven transmission bushing to transmit the rotation of the control bushing to the driven transmission bushing, wherein each of the first engaging toothing and the second engaging toothing comprise respective beveled teeth to allow the driven transmission bushing to move the selector away from the driven transmission bushing when the shaft of the driving wheel rotates at an angular speed greater than the driven transmission bushing in a reverse drive direction of rotation.
A transmission unit with a continuously variable transmission, for a motor vehicle, the transmission unit comprising:
- a shaft of a driving wheel operatively connected to a main drive to control forward drive;
- a reverse drive electric motor;
- a control bushing rotated by the reverse drive electric motor;
- a driven transmission bushing, operatively connected to the shaft of the driving wheel;
- an actuator for controlling mutual coupling between the control bushing and the driven transmission bushing to transmit the motion of the reverse drive electric motor to the shaft of the driving wheel;
- and
- a safety system adapted to prevent reverse drive actuation if the shaft of the driving wheel is turning in a direction of forward movement.
Dependencies are inferred from the claim text.