Compact planetary arrangement for final drive

摘要

A drive assembly, receiving rotational power from an input shaft rotatable about a rotation axis, includes a drive housing and first and second stage planetary gear sets. The first stage planetary gear set includes a first stage sun gear that may be coupled to the input shaft to turn a plurality of first stage planet gears rotatably mounted to a first stage planet carrier that turns with respect to a first stage ring gear, which is fixed with respect to the drive housing. The second stage planetary gear set includes a second stage sun gear turned by the first stage planet carrier to turn a plurality of second stage planet gears rotatably mounted to a second stage planet carrier, which is fixed with respect to the drive housing and about which turns a second stage ring gear. An output hub is rotated about the rotation axis with respect to the drive housing by rotation of the second stage ring gear on the second stage planet carrier.

主权项

1. A drive assembly receiving rotational power from an input shaft rotatable about a rotation axis, the drive assembly comprising:
a drive housing; a first stage planetary gear set contained in the drive housing, the first stage planetary gear set including a first stage sun gear configured to couple to the input shaft to turn a plurality of first stage planet gears rotatably mounted to a first stage planet carrier that turns with respect to a first stage ring gear that is fixed with respect to the drive housing; a second stage planetary gear set contained in the drive housing, the second stage planetary gear set including a second stage sun gear turned by the first stage planet carrier to turn a plurality of second stage planet gears rotatably mounted to a second stage planet carrier that is fixed with respect to the drive housing and about which turns a second stage ring gear; and an output hub rotated about the rotation axis with respect to the drive housing by rotation of the second stage ring gear on the second stage planet carrier; wherein the drive housing has an annular outer surface that provides a bearing mount for a bearing mounting the output hub for rotation with respect to the drive assembly; wherein the bearing mount provides a plane of rotation about which the bearing is mounted symmetrically; and wherein the output hub includes a sprocket flange for mounting an output sprocket, the output sprocket being centered on the plane of rotation.