Product Description:
For any given application, a Planetary gear box is much more compact and of considerable lesser weight compared to a conventional Warm or Helical gear.
Design and Working Principle
The heart of the planetary gearbox is the reduction group composed by the sun pinion (1) and three or more satellites (2) mounted on pins (4) which are supported by the satellite carrier (5). The sun pinion transmits it's motion to the satellites. The satellites then turn inside the ring gear (3) which is static. As consequence the satellite carrier rotates. The motion of the carrier can be transmitted to an output shaft or to another reduction group. The reduction obtained is determined by the relation between the number of teeth on the sun pinion (Z1) and the number of teeth on the ring gear (Z2).
The ratio can be calculated using the shown formula [i=Z2/Z1+1]
Advantages
The planetary gear box offers a set of advantages which makes it an interesting alternative to traditional gear types such as helical and parallel shafts gear boxes. Especially in applications requiring: high reduction ratios, high torque transmission, high radial on output shaft in the following we shall explain why.
Additional Advantages
Low Noise level
Despite the higher number of engaged teeth the noise level remains low as on traditional gear types because the smaller dimensions give lower peripheral velocity on the pitch diameter. Using input stages with grinded teeth on pinions and satellites combined with nitrated ring gears makes it possible to minimize the noise level of an in-line gearbox.
High Efficiency
Despite the higher number of engaged teeth the smaller tooth size makes it possible to obtain efficiencies – typically 0.98 per gear stage.
Flexible Ration
The ration of a planetary stage can easily modified by changing the sun gear and reduction group. The ratio of a multistage gear can easily be adjusted by changing the ration of one or more stages.
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