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1 Introduction
Description
The hub reduction unit consists of a cylindrical planetary
assembly in each hub, fig. 1. The assembly is made up of a sun
gear, a number of planetary gears 3 or 4 which rotate round the
sun gear and a ring gear which houses the planetary gears.
The sun gear is splined to the drive shaft, fig. 2. The planetary
gears are journalled in the hub casing which is fixed to the hub.
The ring gear is splined to the rear axle casing, fig. 3.
The hub is carried in two tapered roller bearings in the rear axle
casing.
When the drive shaft, and thereby the sun gear rotates, the
rotation is transmitted to the planetary gears.
Because the ring gear is fixed to the rear axle casing, the
planetary gears rotate inside the ring gear. Since the hub casing
accompanies this rotation, the movement is transmitted to the
hub. The hub reduction is 3.46:1.
This has been achieved by the number of teeth on the various
gears.
10
ArvinMeritor Wheel end assembly
Fig. 1
Fig. 2
Fig. 3
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