planetary wheel drive

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

Calculating the gear ratio in a planetary gear reducer is much less intuitive as it is dependent on the number of teeth of Planetary Wheel Drive sunlight and ring gears. The planet gears act as idlers and do not affect the apparatus ratio. The planetary equipment ratio equals the sum of the amount of teeth on sunlight and ring equipment divided by the number of teeth on sunlight 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 sets can achieve 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 equipment have the same amount of teeth, no decrease occurs and the apparatus ratio is 1:1. The apparatus is called an idler and its own main function is to change the direction of rotation instead of decrease the speed or increase the torque.

Parallel shaft gearboxes many times contain multiple gear units thereby increasing the apparatus reduction. The total gear decrease (ratio) is determined by multiplying each individual gear ratio from each equipment set stage. If a gearbox contains 3:1, 4:1 and 5:1 gear pieces, the total ratio is 60:1 (3 x 4 x 5 = 60). Inside our example above, the 3,450 rpm electric engine would have its swiftness reduced to 57.5 rpm by utilizing a 60:1 gearbox. The 10 lb-in electric engine torque would be risen to 600 lb-in (before performance losses).


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