A disclosure relates to a gear two-way clutching mechanism that is acted between the power output and the loading and mainly comprising a power source, a loading, a clutching unit and a deceleration unit. When the first output gear of the loading unit is driven by the power source to rotate to a predetermined position, the teeth missing portion is tangential with and corresponds to the buffer gear, or the wheel teeth portion meshes the buffer gear. The clutching unit connected between the power source, and the loading can perform clutch without working and enables the loading end to freely rotate, or the clutching unit can perform mesh working so that power of the power source is directly outputted to the loading end. With the deceleration unit connected to rear section and/or front section of the clutching unit, speed reduction ratio of the transmission chain connected between the power source and the loading can change to achieve effect of enhancing or changing output torque.

A disclosure relates to a gear two-way clutching mechanism that is acted between the power output and the loading and mainly comprising a power source, a loading, a clutching unit and a deceleration unit. When the first output gear of the loading unit is driven by the power source to rotate to a predetermined position, the teeth missing portion is tangential with and corresponds to the buffer gear, or the wheel teeth portion meshes the buffer gear. The clutching unit connected between the power source, and the loading can perform clutch without working and enables the loading end to freely rotate, or the clutching unit can perform mesh working so that power of the power source is directly outputted to the loading end. With the deceleration unit connected to rear section and/or front section of the clutching unit, speed reduction ratio of the transmission chain connected between the power source and the loading can change to achieve effect of enhancing or changing output torque.

A disclosure relates to a gear two-way clutching mechanism that is acted between the power output and the loading and mainly comprising a power source, a loading, a clutching unit and a deceleration unit. When the first output gear of the loading unit is driven by the power source to rotate to a predetermined position, the teeth missing portion is tangential with and corresponds to the buffer gear, or the wheel teeth portion meshes the buffer gear. The clutching unit connected between the power source, and the loading can perform clutch without working and enables the loading end to freely rotate, or the clutching unit can perform mesh working so that power of the power source is directly outputted to the loading end. With the deceleration unit connected to rear section and/or front section of the clutching unit, speed reduction ratio of the transmission chain connected between the power source and the loading can change to achieve effect of enhancing or changing output torque.

A disclosure relates to a gear two-way clutching mechanism that is acted between the power output and the loading and mainly comprising a power source, a loading, a clutching unit and a deceleration unit. When the first output gear of the loading unit is driven by the power source to rotate to a predetermined position, the teeth missing portion is tangential with and corresponds to the buffer gear, or the wheel teeth portion meshes the buffer gear. The clutching unit connected between the power source, and the loading can perform clutch without working and enables the loading end to freely rotate, or the clutching unit can perform mesh working so that power of the power source is directly outputted to the loading end. With the deceleration unit connected to rear section and/or front section of the clutching unit, speed reduction ratio of the transmission chain connected between the power source and the loading can change to achieve effect of enhancing or changing output torque.

PTO systems having reduced gear rattle are disclosed. Embodiments include a PTO having an input gear and an intermediate gear engaging the input gear. The intermediate gear rotates about fixed rotational axis. The input gear is attached to the intermediate gear by a support whereby the rotational axis of the input gear is capable of pivoting about the rotational axis of the intermediate gear at a fixed distance, following an arcuate path. The input gear is configured to engage a transmission gear, and biased to pivot toward the transmission gear, thereby reducing or eliminating gear rattle from overly loose engagement between meshing teeth on the intermediate and transmission gears.

PTO systems having reduced gear rattle are disclosed. Embodiments include a PTO having an input gear and an intermediate gear engaging the input gear. The intermediate gear rotates about fixed rotational axis. The input gear is attached to the intermediate gear by a support whereby the rotational axis of the input gear is capable of pivoting about the rotational axis of the intermediate gear at a fixed distance, following an arcuate path. The input gear is configured to engage a transmission gear, and biased to pivot toward the transmission gear, thereby reducing or eliminating gear rattle from overly loose engagement between meshing teeth on the intermediate and transmission gears.

A flexible gear coupling includes two external gears and two internal gears meshing with the respective two external gears. A tooth root crowning radius of each external gear is smaller than a tooth tip crowning radius of the external gear. The external gear is formed such that a reference tooth height that is a tooth height at a tooth width direction middle position is smaller than an end tooth height that is a tooth height at a tooth width direction end position. A ratio of the end tooth height to the reference tooth height is set to 1.21 or more, and/or a ratio Rc/Rb of the tooth root crowning radius to the tooth tip crowning radius is set to 0.37 or less.

A flexible gear coupling includes two external gears and two internal gears meshing with the respective two external gears. A tooth root crowning radius of each external gear is smaller than a tooth tip crowning radius of the external gear. The external gear is formed such that a reference tooth height that is a tooth height at a tooth width direction middle position is smaller than an end tooth height that is a tooth height at a tooth width direction end position. A ratio of the end tooth height to the reference tooth height is set to 1.21 or more, and/or a ratio Rc/Rb of the tooth root crowning radius to the tooth tip crowning radius is set to 0.37 or less.

A planetary gearbox includes a sun gear having one tooth, a ring gear, planet gears, and a planet carrier on which the pant gears are rotatably arranged. Each of the sun gear, the planet gears, and the ring gear have evoloid toothing. The planetary gearbox enables high load capacity at high transmission ratios by using three circulating planetary gears in the ring gear, which is frame-fixed. The planet gears do not hit each other at a high transmission ration of i=24:1 because of defined addendum modification coefficients and addendum coefficients of the individual gears of the planetary gearbox.

A drive system for an aircraft landing gear, the drive system including a pinion gear, a drive shaft arranged to rotate the pinion gear about a drive axis, a driven gear arranged to mesh with the pinion gear to be rotatable by the pinion gear, the driven gear being connectable to a wheel of the landing gear to be capable of rotating the wheel about a wheel axis; and a flexible interface. The flexible interface includes a plurality of driven gear coupling members, each driven gear coupling member having a first connection portion attached to the driven gear, a second connection portion adapted to be attached to the wheel at an offset distance from the wheel axis, and a joint between the first connection portion and the second connection portion, the joint permitting relative movement between the first connection portion and the second connection portion.