A portable information handling system rotationally couples housing portions with a variable torque hinge having a first axle that rotates with a first housing portion, a second axle that rotates with a second housing portion and a synchronizing gear assembly that translates rotation between the first and second axles. Variable torque is applied by selectively engaging and disengaging a coupler gear with the synchronizing gear assembly to apply and remove an increased torque that resists housing rotation. In one embodiment, the coupler gear is an idler gear of the synchronizing gear mechanism that selectively applies and removes an increase torque of the second axle to the first axle. The coupler gear slides in response to an actuator, such as an electro-permanent magnet acting on a ferromagnetic material with high and low magnetic attraction states.

A portable information handling system rotationally couples housing portions with a variable torque hinge having a first axle that rotates with a first housing portion, a second axle that rotates with a second housing portion and a synchronizing gear assembly that translates rotation between the first and second axles. Variable torque is applied by selectively engaging and disengaging a coupler gear with the synchronizing gear assembly to apply and remove an increased torque that resists housing rotation. In one embodiment, the coupler gear is an idler gear of the synchronizing gear mechanism that selectively applies and removes an increase torque of the second axle to the first axle. The coupler gear slides in response to an actuator, such as an electro-permanent magnet acting on a ferromagnetic material with high and low magnetic attraction states.

A gear transmission having a speed changing section includes a speed changing gear for setting a speed stage and a shift gear slidably mounted on a rotation support shaft and operated to engage and disengage with the speed changing gear, the speed changing section configured to speed-change inputted power and to output the resultant power via the rotation support shaft. An arrangement is provided for facilitating engagement of the shift gear with the speed changing gear even when respective end faces of the shift gear and the speed changing gear hit each other. A transmission mechanism (20B) is provided for outputting power of a rotation support shaft (24) to a traveling device. The transmission mechanism (20B) has a transmission flexibility portion (80) which allows free rotation of the rotation support shaft (24) by a set rotation angle.

In one example, a portion of a transmission includes a first shaft, and a first gear cluster that includes a first group of coaxial nested gears that are movable in an axial direction relative to each other. The first group of coaxial nested gears includes a first gear that is fixed to the first shaft. The portion of a transmission further includes a self-centering mechanism that accommodates tolerance gaps between two successive gears of the first gear cluster.

In one example, a portion of a transmission includes a first shaft, and a first gear cluster that includes a first group of coaxial nested gears that are movable in an axial direction relative to each other. The first group of coaxial nested gears includes a first gear that is fixed to the first shaft. The portion of a transmission further includes a self-centering mechanism that accommodates tolerance gaps between two successive gears of the first gear cluster.

A transmission mechanism includes a plurality of drive gears disposed on a counter shaft and a plurality of driven gears disposed on a drive shaft. Each of the plurality of drive gears is engaged with each of the plurality of driven gears to forma plurality of shift-gear pairs. An eight-speed drive gear, which forms an eight-speed shift-gear pair having the smallest reduction gear ratio, and a seven-speed drive gear, which forms a seven-speed shift-gear pair having the second smallest reduction gear ratio, are disposed adjacent one another at a center portion of an arrangement of the drive gears. An eight-speed driven gear, which forms the eight-speed shift-gear pair, and a seven-speed driven gear, which forms the seven-speed shift-gear pair, are disposed adjacent one another at a center portion of an arrangement of the driven gears.

A transmission mechanism includes a plurality of drive gears disposed on a counter shaft and a plurality of driven gears disposed on a drive shaft. Each of the plurality of drive gears is engaged with each of the plurality of driven gears to forma plurality of shift-gear pairs. An eight-speed drive gear, which forms an eight-speed shift-gear pair having the smallest reduction gear ratio, and a seven-speed drive gear, which forms a seven-speed shift-gear pair having the second smallest reduction gear ratio, are disposed adjacent one another at a center portion of an arrangement of the drive gears. An eight-speed driven gear, which forms the eight-speed shift-gear pair, and a seven-speed driven gear, which forms the seven-speed shift-gear pair, are disposed adjacent one another at a center portion of an arrangement of the driven gears.

An in-case oil passage extending in an axial direction above a plurality of gears is formed inside an outer peripheral wall portion of the accommodating case. The in-case oil passage includes an in-case oil passage opening portion which opens from the cover wall portion to the one end side in the axial direction. The cover wall portion is provided with an oil guide member at a position where at least a part of the cover wall portion overlaps the in-case oil passage opening portion when viewed from the one end side in the axial direction, the oil guide member guiding oil discharged from the in-case oil passage opening portion to the oil collecting portion of the oil collecting pocket.

A reverse transmission system for a vehicle for engaging a reverse action on a normally forward action only engine transmission having a longitudinal orientation driveshaft output, the reverse transmission system comprising a gear rotatably connected to the longitudinal orientation driveshaft output of a normally forward action only engine transmission output; a shaft rotatably connected to the gear for transmitting power from the normally forward action only engine transmission output to the shaft; a chain sprocket connected to a chain drive and to the shaft for providing a transverse orientation output to the chain drive to change the direction of rotation of the driveshaft output, thereby for engaging the vehicle in the reverse action; and a reverse fork configured to actuate a reverse dog configured to slide upon the shaft to reversibly engage a reverse gear engaged to a first gear of the engine transmission.

A reverse transmission system for a vehicle for engaging a reverse action on a normally forward action only engine transmission having a longitudinal orientation driveshaft output, the reverse transmission system comprising a gear rotatably connected to the longitudinal orientation driveshaft output of a normally forward action only engine transmission output; a shaft rotatably connected to the gear for transmitting power from the normally forward action only engine transmission output to the shaft; a chain sprocket connected to a chain drive and to the shaft for providing a transverse orientation output to the chain drive to change the direction of rotation of the driveshaft output, thereby for engaging the vehicle in the reverse action; and a reverse fork configured to actuate a reverse dog configured to slide upon the shaft to reversibly engage a reverse gear engaged to a first gear of the engine transmission.