A planetary gearbox is a gearbox with the insight shaft and the output 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 a good example of a planet-wheel mechanism: Perhaps you have ever wondered how you can get so much power and features in such a little hub? For a three-velocity 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 direct coupling and an acceleration mode.

In mathematical terms, the tiniest reduction ratio is 3: 1, the biggest is 10: 1. At a ratio of less than 3, the sun 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 often absolute i.electronic. an integer number.

Whoever invented the planetary gearbox isn’t known, but was functionally described simply by Leonardo da Vinci in 1490 and has been used for years and years.