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1 Part 2 - Traditional wheel end with 3-4 planets
Spindle fitted with interference
Fig. 1.1
Sun gear
Fig. 1.2
Fig. 1.3
Ring gear
Axle shaft
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.
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 1+(64/26)=3.46
Ratio (3.33:1) - 3 or 4 planets 1+(63/27)=3.33
Sun teeth
Planets
gears
Fig. 1.4
Meritor Wheel end assembly
35
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