A direct shift continuously variable transmission for a vehicle engine includes a variator having a toroidal cavity; a plurality of traction roller rotatably and radially located within the toroidal cavity; an input shaft rotatably disposed within the variator, the input shaft being adapted to receive a torque from the vehicle engine; an input disk coaxially connected to the input shaft and frictionally contacting the traction roller to provide a rotational force to the traction roller; an output disk opposed to the input disk and frictionally contacting the traction roller, the output disk being annularly rotatable by receiving the rotational force from the traction roller; and an output shaft coaxially connected to the output disk and receiving the rotational force from the output disk.

Disclosed is a toroidal variable speed traction drive including a driving disc and a driven disc, with a plurality of roller assemblies in between. Each roller assembly has a toroidal rolling surface to contact the toroidal surface of the corresponding disc, and a conical surface, for engaging the other roller in the assembly. An engagement is provide to prevent or reduce axial movement between the first and second rollers along the conical surface.

Disclosed is a toroidal variable speed traction drive including a driving disc and a driven disc, with a plurality of roller assemblies in between. Each roller assembly has a toroidal rolling surface to contact the toroidal surface of the corresponding disc, and a conical surface, for engaging the other roller in the assembly. An engagement is provide to prevent or reduce axial movement between the first and second rollers along the conical surface.

A continuously variable transmission includes a housing, an input assembly, a driven assembly, an output assembly, and a speed changing rod. The input assembly, the driven assembly, and the output assembly are rotatably assembled to the housing. The input assembly includes a power input shaft and a first friction member fixedly sleeved on the power input shaft. The driven assembly is positioned oppositely to the input assembly. The driven assembly includes a rotation shaft and a second friction member fixedly sleeved on the rotation shaft. The output assembly includes a power output shaft and a rotational wheel non-rotatably sleeved on the power output shaft and engaging between the first friction member and the second friction member. Rotations of the first friction member and the second friction member rotate the power output shaft, a transmission ratio of continuously variable transmission is adjustable by moving the speed changing rod.

A continuously variable transmission includes a housing, an input assembly, a driven assembly, an output assembly, and a speed changing rod. The input assembly, the driven assembly, and the output assembly are rotatably assembled to the housing. The input assembly includes a power input shaft and a first friction member fixedly sleeved on the power input shaft. The driven assembly is positioned oppositely to the input assembly. The driven assembly includes a rotation shaft and a second friction member fixedly sleeved on the rotation shaft. The output assembly includes a power output shaft and a rotational wheel non-rotatably sleeved on the power output shaft and engaging between the first friction member and the second friction member. Rotations of the first friction member and the second friction member rotate the power output shaft, a transmission ratio of continuously variable transmission is adjustable by moving the speed changing rod.

This invention provides a continuously variable transmission (CVT) system using variable disk friction drive. The CVT system comprises a variator (17) including a roller (216), having a cam follower (243; 247), which is radially displaceable from a central axis and mounted in friction drive contact with a drive disk (15); and a rotatable spiral cam (181 ) including a spiral cam cavity (301) arranged such that the roller (216) and the cam follower (243; 247) protrudes through the spiral cam cavity (301), the spiral cam (181) being rotatable about a central axis to radially displace the roller (216). The invention includes a three-mode synchronous system adapted to cooperate with the variator (17).

This invention provides a continuously variable transmission (CVT) system using variable disk friction drive. The CVT system comprises a variator (17) including a roller (216), having a cam follower (243; 247), which is radially displaceable from a central axis and mounted in friction drive contact with a drive disk (15); and a rotatable spiral cam (181 ) including a spiral cam cavity (301) arranged such that the roller (216) and the cam follower (243; 247) protrudes through the spiral cam cavity (301), the spiral cam (181) being rotatable about a central axis to radially displace the roller (216). The invention includes a three-mode synchronous system adapted to cooperate with the variator (17).

A continuously variable transmission in which a circular driver, positioned between and frictionally engaged with op posing surfaces of two oppositely rotatable disks, which are urged towards each other with a biasing mechanism, is mounted to, and is movable axially along, a drive shaft which extends radially from an input shaft which rotates the drive shaft about a longitudinal axis of the input shaft, and wherein output drive is taken from the disks via a speed balancing system.

A continuously variable transmission in which a circular driver, positioned between and frictionally engaged with op posing surfaces of two oppositely rotatable disks, which are urged towards each other with a biasing mechanism, is mounted to, and is movable axially along, a drive shaft which extends radially from an input shaft which rotates the drive shaft about a longitudinal axis of the input shaft, and wherein output drive is taken from the disks via a speed balancing system.

Disclosed is a toroidal variable speed traction drive including a driving disc and a driven disc, with a plurality of roller assemblies in between. Each roller assembly has a toroidal rolling surface to contact the toroidal surface of the corresponding disc, and a conical surface, for engaging the other roller in the assembly. An engagement is provide to prevent or reduce axial movement between the first and second rollers along the conical surface.