A method for controlling a pulley of a vehicle having a continuously variable transmission may include: determining, by a controller, a pulley target torque and a target pulley ratio, upon detecting disturbance of the vehicle; determining, by the controller, target pressures of a driving pulley and a driven pulley based on the pulley target torque and the target pulley ratio and comparing the target pressures with each other; and controlling, by the controller, a pressure of a pulley having a larger target pressure in the comparing to be a maximum pressure generatable depending on a traveling situation of the vehicle and controlling a pressure of the other pulley to be increased to a correction pressure for implementing the target pulley ratio.

A continuously-variable transmission (CVT) assembly is employed for transmitting a torque from an external power-source. The CVT includes a variable-diameter input pulley and a variable-diameter output pulley, each having a respective range of adjustment. The CVT also includes a continuous torque-transmitting element extending between the variable-diameter input pulley and the variable-diameter output pulley, and thereby operatively connecting the input pulley to the output pulley. The CVT additionally includes a first elastic element having a first zero stiffness over the range of adjustment of the variable-diameter input pulley and configured to apply a first constant spring clamping force via the input pulley to the continuous torque-transmitting element. Furthermore, the CVT includes a second elastic element having a second zero stiffness over the range of adjustment of the variable-diameter input pulley and configured to apply a second constant spring clamping force via the output pulley to the continuous torque-transmitting element.

A method for controlling a pulley of a vehicle having a continuously variable transmission may include: determining, by a controller, a pulley target torque and a target pulley ratio, upon detecting disturbance of the vehicle; determining, by the controller, target pressures of a driving pulley and a driven pulley based on the pulley target torque and the target pulley ratio and comparing the target pressures with each other; and controlling, by the controller, a pressure of a pulley having a larger target pressure in the comparing to be a maximum pressure generatable depending on a traveling situation of the vehicle and controlling a pressure of the other pulley to be increased to a correction pressure for implementing the target pulley ratio.

An apparatus and methods are provided for a CVT primary clutch that provides enhanced adjustability and performance to off-road vehicle drivetrain. The clutch comprises a stationary sheave attached to a center post coupled to an output end of an engine crankshaft. A moveable sheave slides along the center post toward and away from the stationary sheave in response to engine RPM. A spider portion mounted onto the center post is coupled with the moveable sheave by multiple shift arms and ramps. The shift arms roll along the ramps to push the moveable sheave toward the stationary sheave in response to engine RPM. The weight of the shift arms and the angle of the ramps may be adjusted to affect the engine RPM at which the moveable sheave begins to move toward the stationary sheave. A face plate is fastened onto the moveable sheave for protecting internal components of the clutch.

A continuously variable transmission including a first pulley means, a second pulley means and an elongate, flexible endless transmission element that is passed over both the first pulley means and the second pulley means, wherein the first pulley means include two sheaves which are adjustable in an axial direction of the first rotation axis line, and an adjusting means for moving the two adjustable sheaves toward and away from each other in the axial direction for setting an operative radius of the first pulley means at which the transmission element is passed over the first pulley means, wherein the first pulley means is provided with alignment means for causing the two movable sheaves to jointly move additionally in the axial direction of the first rotation axis under the influence of a force exerted in axial direction on the first pulley means by the transmission element while maintaining the operative radius.

A primary clutch of a continuously variable transmission with a launch mechanism is provided. The primary clutch includes a central post, a fixed sheave assembly, a movable sheave assembly and a locking mechanism. The central post is configured to receive rotational torque from a motor. The fixed sheave assembly is statically mounted on the central post. The movable sheave assembly is mounted on the central post. The movable sheave assembly includes a movable sheave system that is configured to move axially on the central post towards the fixed sheave assembly as RPM of the primary clutch increase. The locking mechanism is configured and arranged to selectively prevent movement of the movable sheave system independent of the RPM of the primary clutch.

A hybrid vehicle includes an engine, a motor, and a belt stepless speed changer device having a driving rotary body, a driven rotary body, a first shaft member supporting the driving rotary body with allowing rotation thereof in unison, a second shaft member supporting the driven rotary body with allowing rotation thereof in unison, and an endless belt wound around the driving rotary body and the driven rotary body. The vehicle further includes a transmission case configured to receive the powers from the engine and the motor via the belt stepless speed changer device and a centrifugal clutch incorporated in a power transmission line extending form the engine to the first shaft member. The motor is disposed on the side opposite the engine across the driving rotary body, and the driving power of the motor is inputted to the first shaft member.

A continuously variable transmission device (1) for a two-wheel, three-wheel or four-wheel motorcycle includes a gear shift regulation device suitable to operate on special rollers (18) through an adjustable axial action independently of the number of engine revolutions. The device influences the centrifugal movement of the rollers (18) and thus influences the gear shift.

A continuously variable transmission device (1) for a two-, three- or four-wheel motorcycle comprises a gear shift regulation device provided with a slide (40) axially slidable and suitable to engage special rollers (18) to hold them during the gear shift. A mobile bushing (9) is suitable to influence the slide (40) to cause its translation from a rearward position to a forward limit position to engage the special rollers (18).

A continuously variable transmission device (1) for a two-wheel, three-wheel or four-wheel motorcycle includes a cam system (20, 22; 32a, 32b) operating between a fixed bushing (11) and a mobile bushing (9). The device is configured to obstruct the approach between the active surfaces (8a, 10a) or to facilitate the approach of the active surfaces.