WHAT IS A PLANETARY GEARBOX?

A planetary gearbox is a gearbox with the insight shaft and the output shaft aligned. A planetary gearbox can be used to transfer the biggest torque in the the majority of compact form (known as torque density).

The bicycle’s acceleration hub is a superb 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-acceleration hub, a one-stage planetary gear system is used, for a five-acceleration hub a 2-stage. Each planet gear program includes a reduction state, a primary coupling and an acceleration setting.

In mathematical terms, the smallest reduction ratio is 3: 1, the biggest is 10: 1. At a ratio of less than 3, sunlight gear becomes too big against the earth 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.