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1 Part 1 - Hub reduction with 3 - 4 planets
Wheel end with unitized bearing
Description
The hub reduction unit consists of a cylindrical planetary
assembly in each hub, fig. 1.1. The reduction 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 planets gears.
The sun gear is located on the axle shaft by spline, fig. 1.2
The ring gear is jointly to the rear axle spindle by spline, fig. 1.3
The hub is carried on two tapered roller bearings.
When the drive shaft, and the sun gear rotates, the rotation is
transmitted to the planets gears.
Sun gear
Fig. 1.2
Because the ring gear is fixed to the rear axle spindle, the planets
gears rotate inside the ring gear and the rotation movement is
transmitted to the hub assy.
Ratio formula = 1+(Z Ring gear / Z Sun teeth), fig. 1.4
The hub reduction ration is 3.46:1 or 3.33:1
Ratio (3.46:1) - 3 or 4 planets
Ratio (3.33:1) - 3 or 4 planets
10
Meritor Wheel end assembly
Axle shaft
1+(64/26)=3.46
1+(63/27)=3.33
Fig. 1.1
Fig. 1.3
Sun teeth
Planets
gears
Fig. 1.4
Ring gear
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