Embodiments of the disclosed gear transmission comprise an input shaft and a coaxial output shaft, a planetary gear assembly configured with a sun gear fixedly articulated to the input shaft, a ring gear of the planetary gear assembly fixed at a hub of a transmission plate configured with a peripheral gear ring, a gear ratio changing mechanism comprising a pinion gear engaged with the peripheral gear ring of the transmission plate and rotatable about a radial axis, and a transmission pinion gear coupled to an axle rotatably articulated with the pinion gear. The transmission pinion gear being displaceable along the axle and configured for engaging with a rotatable gear plate. The gear plate is coaxially articulated with the output shaft and the gear plate is configured at an inside face thereof with a plurality of coaxially disposed gear rings. The transmission pinion gear is engageable with a gear ring of the gear plate, and the gear ratio changing mechanism comprises a manipulator configured for selective radial displacing the transmission pinion gear between gear rings of the gear plate. The axle is configured to rotate about its longitudinal axis and simultaneously rotate about a central axis of the input shaft in a direction opposed to the direction of rotation of the transmission plate.

A two-speed pulley assembly for an engine accessory drive includes a planetary gear, a pulley, a friction clutch, and a one-way clutch. The planetary gear has a ring gear, a sun gear, a planet carrier, and a planet gear. The planet gear is rotatable relative to the planet carrier and is drivingly engaged with the ring gear and the sun gear. The pulley circumscribes the ring gear and is in driving engagement with the ring gear. The friction clutch is arranged to selectively prevent rotation of the sun gear. The one-way clutch is arranged between the sun gear and the ring gear to permit rotation of the sun gear relative to the ring gear in a first rotational direction, and prevents rotation in a second rotational direction, opposite the first rotational direction.

A two-speed pulley assembly for an engine accessory drive includes a planetary gear, a pulley, a friction clutch, and a one-way clutch. The planetary gear has a ring gear, a sun gear, a planet carrier, and a planet gear. The planet gear is rotatable relative to the planet carrier and is drivingly engaged with the ring gear and the sun gear. The pulley circumscribes the ring gear and is in driving engagement with the ring gear. The friction clutch is arranged to selectively prevent rotation of the sun gear. The one-way clutch is arranged between the sun gear and the ring gear to permit rotation of the sun gear relative to the ring gear in a first rotational direction, and prevents rotation in a second rotational direction, opposite the first rotational direction.

In an aspect, a V tensioner is provided and includes a first arm and a second arm. A damping structure and a damping system biasing member are provided. The damping system biasing member is positioned axially in between the first and second arms.

In an aspect, a V tensioner is provided and includes a first arm and a second arm. A damping structure and a damping system biasing member are provided. The damping system biasing member is positioned axially in between the first and second arms.

An extension/contraction mechanism in which an extension/contraction part is able to turn is provided. An extension/contraction mechanism according to one aspect of the present disclosure includes a first drive source connected to a sending/pulling part so as to be able to transmit a drive force, and a second drive source connected to the sending/pulling part and a turning part that rotatably supports the sending/pulling part so as to be able to transmit a drive force via a gear group. When a rotational speed transmitted to the sending/pulling part to rotate the sending/pulling part by the first drive source is equal to a rotational speed transmitted to the sending/pulling part to rotate the sending/pulling part by the second drive source, an extension/contraction part turns via the turning part. When the above rotational speeds are different from each other, the extension/contraction part is extended or contracted.

An extension/contraction mechanism in which an extension/contraction part is able to turn is provided. An extension/contraction mechanism according to one aspect of the present disclosure includes a first drive source connected to a sending/pulling part so as to be able to transmit a drive force, and a second drive source connected to the sending/pulling part and a turning part that rotatably supports the sending/pulling part so as to be able to transmit a drive force via a gear group. When a rotational speed transmitted to the sending/pulling part to rotate the sending/pulling part by the first drive source is equal to a rotational speed transmitted to the sending/pulling part to rotate the sending/pulling part by the second drive source, an extension/contraction part turns via the turning part. When the above rotational speeds are different from each other, the extension/contraction part is extended or contracted.

A hybrid power system includes: an engine; a continuously variable transmission, power being transferred between the continuously variable transmission and the engine; a first transmission, power being transferred between the first transmission and the continuously variable transmission; a first main decelerator, power being transferred between the first main decelerator and the first transmission; a first half shaft, power being transferred between the first half shaft the first main decelerator; a motor; a second transmission, power being transferred between the second transmission and the motor; a second main decelerator, power being transferred between the second main decelerator and the second transmission; and a second half shaft, power being transferred between the second half shaft and the second main decelerator, one of the first half shaft and the second half shaft being a front half shaft, and the other thereof being a rear half shaft.

A hybrid power system includes: an engine; a continuously variable transmission, power being transferred between the continuously variable transmission and the engine; a first transmission, power being transferred between the first transmission and the continuously variable transmission; a first main decelerator, power being transferred between the first main decelerator and the first transmission; a first half shaft, power being transferred between the first half shaft the first main decelerator; a motor; a second transmission, power being transferred between the second transmission and the motor; a second main decelerator, power being transferred between the second main decelerator and the second transmission; and a second half shaft, power being transferred between the second half shaft and the second main decelerator, one of the first half shaft and the second half shaft being a front half shaft, and the other thereof being a rear half shaft.

A shifting device for a transmission is disclosed. The shifting device comprises a transmission shaft, a shift gear being mounted thereon, wherein the shift gear is configured with a connecting hub which is axially displaceable relative to the transmission shaft, wherein the connecting hub has an internal toothing in engagement with an external toothing of the transmission shaft, so that the shift gear is drive-connected to the transmission shaft in an axially displaceable manner therewith. A latching device is further provided, the shift gear being axially displaceable thereby into a plurality of latching positions. The latching device comprises a spring-pretensioned setting pin displaceably mounted radially to the transmission shaft and in engagement with a setting shaft rotatably mounted in the transmission shaft, such that the setting shaft and the setting pin can be brought out of an unlocked position into a locked position and vice-versa by rotating the setting shaft.