A planetary gearbox is a gearbox with the insight shaft and the result shaft aligned. A planetary gearbox is utilized to transfer the largest torque in the the majority of compact form (referred to as torque density).

The bicycle’s acceleration hub is an excellent example of a planet-wheel mechanism: Have you ever wondered ways to get so much power and features in such a little hub? For a three-quickness hub, a one-stage planetary gear system is used, for a five-swiftness hub a 2-stage. Each planet gear program has a reduction state, a primary coupling and an acceleration setting.

In mathematical terms, the tiniest reduction ratio is 3: 1, the biggest is 10: 1. At a ratio of significantly less than 3, sunlight gear becomes too large against the planet gears. At a ratio greater than 10 sunlight wheel becomes too small and the torque will drop. The ratios are usually absolute i.electronic. an integer number.

Whoever invented the planetary gearbox is not known, but was functionally described simply by Leonardo da Vinci in 1490 and has been used for centuries.