A continuously variable transmission (CVT comprises a shaft rotatable about an axis, and variator assembly, and an actuator mechanism. The variator assembly includes a pulley supported on the shaft and having a ramp surface, and an endless rotatable device frictionally engaged with the pulley. The ramp surface inclines in an axial direction along the axis toward the endless rotatable device. The CVT further comprises an actuator mechanism that includes a wedge component that has a wedge surface interfacing with the ramp surface, and a rotary piston operatively connected to the wedge component. The rotary piston defines a first fluid chamber pressurizable to apply a rotational force that provides relative motion between the ramp surface and the wedge surface resulting in a wedge force on the ramp surface and a clamping force of the endless rotatable device on the pulley.

A continuously variable transmission (CVT comprises a shaft rotatable about an axis, and variator assembly, and an actuator mechanism. The variator assembly includes a pulley supported on the shaft and having a ramp surface, and an endless rotatable device frictionally engaged with the pulley. The ramp surface inclines in an axial direction along the axis toward the endless rotatable device. The CVT further comprises an actuator mechanism that includes a wedge component that has a wedge surface interfacing with the ramp surface, and a rotary piston operatively connected to the wedge component. The rotary piston defines a first fluid chamber pressurizable to apply a rotational force that provides relative motion between the ramp surface and the wedge surface resulting in a wedge force on the ramp surface and a clamping force of the endless rotatable device on the pulley.

A starting strategy for a power train (10) of a motor vehicle including an internal combustion engine (11) fitted with a drive shaft (12) extending along a longitudinal axis (X), an alternator-starter (14), a first pulley (15, 19) that is designed to be driven in rotation by the drive shaft, a pulley (16) that is rigidly connected to a shaft of the alternator-starter, a belt (17) encircling said two pulleys, and a coupling/decoupling system (18) between the first pulley (19) and the drive shaft of the engine (12),

characterized in that the starting strategy includes a preparation procedure for said belt in cold weather.

A motor vehicle planetary axis transfer gearbox system includes a connective housing connecting an engine to a transmission of a motor vehicle with the transmission being positioned forward of the engine. An axis of an engine output shaft is oriented substantially parallel to an axis of a transmission input shaft. Both the axis of the engine output shaft and the axis of the transmission input shaft are oriented substantially perpendicular to a central axis of the motor vehicle. A planetary gear set is connected to one of the engine output shaft or the transmission input shaft acting to reverse a direction of rotation of either the engine output shaft or the transmission input shaft to match a direction of rotation of both the engine output shaft and the transmission input shaft. A drive chain connects the engine output shaft to the transmission input shaft.

A motor vehicle planetary axis transfer gearbox system includes a connective housing connecting an engine to a transmission of a motor vehicle with the transmission being positioned forward of the engine. An axis of an engine output shaft is oriented substantially parallel to an axis of a transmission input shaft. Both the axis of the engine output shaft and the axis of the transmission input shaft are oriented substantially perpendicular to a central axis of the motor vehicle. A planetary gear set is connected to one of the engine output shaft or the transmission input shaft acting to reverse a direction of rotation of either the engine output shaft or the transmission input shaft to match a direction of rotation of both the engine output shaft and the transmission input shaft. A drive chain connects the engine output shaft to the transmission input shaft.

A control apparatus for a vehicular continuously variable transmission is provided. The control apparatus includes a pair of pulley pressure adjusting valves, a pair of electromagnetic valves, a source pressure adjusting valve and an electronic control unit. The electronic control unit is configured to control the source pressure adjusting valve in such a manner as to lower the source pressure at a time of a fail mode below the source pressure at a time of a non-fail mode, at the time of the fail mode, and control command signals to the pair of the electromagnetic valves such that the command signals temporarily decrease below command signals at the time of the non-fail mode, before cancelling the lowering of the source pressure in making a changeover from the fail mode to the non-fail mode.

A control apparatus for a vehicular continuously variable transmission is provided. The control apparatus includes a pair of pulley pressure adjusting valves, a pair of electromagnetic valves, a source pressure adjusting valve and an electronic control unit. The electronic control unit is configured to control the source pressure adjusting valve in such a manner as to lower the source pressure at a time of a fail mode below the source pressure at a time of a non-fail mode, at the time of the fail mode, and control command signals to the pair of the electromagnetic valves such that the command signals temporarily decrease below command signals at the time of the non-fail mode, before cancelling the lowering of the source pressure in making a changeover from the fail mode to the non-fail mode.

A belt drive system comprising a belt having a plurality of longitudinally spaced belt teeth, the belt further comprising a longitudinal groove extending in the endless direction of the belt through the belt teeth, a sprocket comprising a plurality of sprocket teeth on an outer circumference of the sprocket, each of the sprocket teeth extending parallel to the rotation axis, and each sprocket tooth configured to be received between adjacent belt teeth, and a first planar fin extending from at least one side of a sprocket tooth, the first planar fin configured to cooperatively engage the longitudinal groove, the first planar fin extending in a direction normal to a sprocket axis of rotation, the first planar fin having a width no greater than 20% of a sprocket groove width (W).

A gear transmission including a housing accommodating a gear ratio changing mechanism, a gear plate articulated to an output shaft coaxially rotatable about an axis of a central hub of the housing and including a plurality of coaxially disposed gear rings selectively engaged by the gear ratio changing mechanism, a transmission plate coaxially rotatable about an axis of the central hub and having a peripheral gear ring coupled to the gear ratio changing mechanism including a pinion gear rotatably articulated with an axle and engaged with the peripheral gear ring of the transmission plate for transferring input rotary motion thereby received to the axle, a transmission pinion gear rotatable by the axle and displaceable therealong for engaging one of the coaxially disposed gear rings of the gear plate, and a manipulator configured for selective radial displacing the transmission pinion gear over the axle between gear rings of the gear plate.

A hub planetary belt transmission (2) has a platform body (50) supporting a motor drive (8) having a motor drive shaft (6) coupled to a distributing and a collecting pulley (4, 18) attached to a first output shaft (22) coupled to a first propulsion element (40, 44). A housing (30) coupled to peripheral shafts (24) attached to tension arms (26) is concentrically rotatable about a common axis of the distributing and collecting pulleys and is coupled to a second propulsion element (42, 45). Transmitting pulleys (12, 14) are driven by distributing belts (10) and collecting belts (20) for rotating together with the peripheral shafts and tension arms about a common axis of the distributing and collecting pulleys so as to create a centripetal force which stretches the distributing belts and the collecting belts, thus regulating the coupling force between the belts and pulleys based on the rotation velocity.