planetary wheel drive

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

Calculating the gear ratio in a planetary gear 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 don’t affect the apparatus ratio. The planetary gear ratio equals the sum of the number of teeth on sunlight and ring gear divided by the amount of teeth on sunlight gear. For instance, a planetary established with a 12-tooth sun gear and 72-tooth ring gear has a gear ratio of 7:1 ([12 + 72]/12 = 7). Planetary gear units can perform ratios from about 3:1 to about 11:1. If more gear reduction is needed, additional planetary stages may be used.

If a pinion equipment and its mating equipment have the same amount of teeth, no reduction occurs and the gear ratio is 1:1. The apparatus is named an idler and its primary function is to change the direction of rotation instead of decrease the speed or boost the torque.

Parallel shaft gearboxes many times contain multiple gear models thereby increasing the apparatus reduction. The total gear reduction (ratio) depends upon multiplying each individual equipment ratio from each gear arranged stage. If a gearbox includes 3:1, 4:1 and 5:1 gear units, the full total ratio is 60:1 (3 x 4 x 5 = 60). In our example above, the 3,450 rpm electric electric motor would have its velocity decreased to 57.5 rpm by using a 60:1 gearbox. The 10 lb-in electric engine torque would be increased to 600 lb-in (before performance losses).

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