Gearbox with reduced backlash

摘要

A gearbox includes two axially spaced epicyclic gear trains, each having a sun gear, axially spaced planet gears carried by a planet carrier, and a ring gear fixed to the gear box. One of the planet gears engages with the fixed ring gear, and another of the planet gears engages with an output ring gear. The sun gears of the two gear trains are mounted on a single shaft. The planet carriers of the two gear trains are mounted on a shaft so that they can freely rotate but have limited axial motion along the shaft. The two output ring gears are helical gears of opposite handedness.

主权项

1. A gearbox, including:
two axially spaced epicyclic gear trains, each epicyclic gear train having:
a sun gear,a plurality of axially spaced planet gears, which rotate as one and are carried by a planet carrier, anda ring gear fixed to the gearbox;wherein one of the plurality of axially spaced planet gears engages with the sun gear and the ring gear, andwherein another of the plurality of axially spaced planet gears engages with an output ring gear; wherein the sun gears of the two epicyclic gear trains are mounted on a single input shaft extending in an axial direction; wherein the planet carriers of the two epicyclic gear trains are mounted on an axial shaft so that they can freely rotate around the shaft but their axial motion along the shaft is limited; and wherein the said other of the plurality of the axially spaced planet gears and the output ring gear of each epicyclic gear train are formed as helical gears, with the helical pitch being the same for both gear trains and the handedness being different.