Planetary Gearbox

A planetary gearbox refers to a gear system in which one or more ‘planet’ gears rotate around a central ‘sun’ gear. Typically, a planet carrier is driven by the input torque which rotates the planets around a fixed outer ring (sometimes referred to as the annulus). This in turn drives the sun gear which then provides the output torque. However there are examples of the other combinations, such as the sun gear being fixed and the ring providing output torque.

The main advantage of planetary gearboxes are their high power transmission efficiencies. Typicially this can be around just 3% per stage. Further to this, the high effiency is delivered despite the compact design giving a large torque to size/weight ratio. Some of this is thanks to the load sharing that occurs across the multiple planet gears.

Reliable Small Planetary Gearbox

Assun Motor’s small planetary gearbox is available in 7 different sizes with diameters of 16mm, 22mm, 26mm, 28mm, 32mm, 36mm, and 45mm, each consisting with mono and multi-stages, and the gear ratios range from 3.3:1 ~ 1500:1.

We used high quality material and assembled the small planetary gearbox parts, ensuring these benefits to the users;

– utilise active connection between the sun gear and planet carrier.
Active connection between these two parts able to minimise the error tolerance among parts.
– better force transmission efficiency.
low noise, high efficiency and long lifespan.

The main feature of our gearboxes are that most of the parts are heat-treated stainless steel, which is able to withstand high temperature and prolong usage time under critical environment.

Torque ranges from 0.1 ~ 10Nm. Our gearbox can deliver 1.5 times rated torque on intermittent usage of less than 1 minute.

Our small planetary gearbox are build to last, reliable and minimum error tolerance that’s suitable in aerospace, automation, smart household, electric tools, medical devices and robotics applications.

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