| 摘要 |
A planetary gear transmission has two or more planetary gear sets (2a, 2b, 2c, 2d) in the gear train. Each planetary gear set comprises a sun gear (1) mounted on a sun shaft (5) with the sun gear (1) engaging a plurality of planet gears (2) mounted on a planet carrier (4) with the plurality of planet gears (2) engaging a ring gear (3) mounted on the transmission housing (7). Each gear of the planetary gear transmission is a helical cut gear. Sun gears (1a, 1b, 1c, 1d) and/or ring gears (3a, 3b, 3c, 3d) are mounted for axial movement with respect to the transmission. Thrust imbalances on the sun gears (1a, 1b, 1c, 1d) and/or ring gears (3a, 3b, 3c, 3d) resulting from uneven loading and the helical cut result in sun gears (1a, 1b, 1c, 1d) and/or ring gears (3a, 3b, 3c, 3d) moving in the axial direction to eliminate the thrust imbalances and thereby resulting in equal loading or power sharing amongst the planetary gear sets (2a, 2b, 2c, 2d).
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