planetary wheel drive

The gear reduction in a right-angle worm drive would depend on the number of threads or “starts” on the worm and the number of teeth on the mating worm wheel. If the worm has two begins and the mating worm wheel has 50 the teeth, the resulting gear ratio is 25:1 (50 / 2 = 25).

Calculating the apparatus ratio in a planetary equipment reducer is less intuitive since it is dependent upon the number of teeth of the sun and ring gears. The earth gears act as idlers and do not affect the apparatus ratio. The planetary gear ratio equals the sum of the number of teeth on sunlight and ring gear divided by the number of teeth on the sun gear. For example, a planetary arranged with a 12-tooth sun gear and 72-tooth ring gear has a gear ratio of 7:1 ([12 + 72]/12 = 7). Planetary gear pieces can perform ratios from about 3:1 to about 11:1. If more gear reduction is necessary, additional planetary stages may be used.

If a pinion equipment and its mating gear have the same number of teeth, no decrease occurs and the gear ratio is 1:1. The apparatus is named an idler and its own major function is to change the direction of rotation rather than decrease the speed or Planetary Wheel Drive increase the torque.

Parallel shaft gearboxes often contain multiple gear pieces thereby increasing the gear reduction. The total gear reduction (ratio) is determined by multiplying each individual equipment ratio from each gear arranged stage. If a gearbox contains 3:1, 4:1 and 5:1 gear units, the full total ratio is 60:1 (3 x 4 x 5 = 60). Inside our example above, the 3,450 rpm electric motor would have its rate decreased to 57.5 rpm by using a 60:1 gearbox. The 10 lb-in electric engine torque would be risen to 600 lb-in (before effectiveness losses).

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