WHAT IS A PLANETARY GEARBOX?

A planetary gearbox is a gearbox with the input shaft and the result shaft aligned. A planetary gearbox is utilized to transfer the biggest 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 small hub? For a three-speed hub, a one-stage planetary gear system can be used, for a five-speed hub a 2-stage. Each planet gear program has a reduction state, a primary coupling and an acceleration mode.

In mathematical terms, the tiniest reduction ratio is 3: 1, the largest is 10: 1. At a ratio of significantly less than 3, the sun gear becomes too big against the planet gears. At a ratio greater than 10 sunlight wheel becomes too little 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 by Leonardo da Vinci in 1490 and has been used for years and years.