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Planetary Gear Reducers: Rotating Around the Sun

Categories: Latest NewsRelease time: 2016-07-08 17:41:00
Source: ZHAOWEIEditor: ZHAOWEI Author: ZHAOWEI

Planetary gear reducers belong to the epicyclic family of reducers, since the planet gears trace epicycloidal curves in space—very similar to how the popular kid’s toy, the spirograph, works. Simple planetary gears are arranged with a centrally located, externally toothed sun gear that meshes with one or more externally toothed planet gears. As the name implies, the “planet gears” rotate around the “sun gear.” The planet gears also mesh with an internally-toothed ring gear—which encompasses the entire gear set.

Characteristics

High torque capacity in a compact package – Due to the load sharing of several planet gears, planetary gear reducers can handle the same torque that a larger parallel axis gear set can take. Although planetary gear sets will likely have more components than a parallel axis gear set, the smaller-size-for-equivalent-torque planetary reducer will be less expensive.

High efficiency – A single stage of planetary gears will likely be over 95 percent efficient.

High torsional stiffness – Since the sun gear will likely contact multiple planet gears, the torsional stiffness, or resistance to elastic deformation, is higher in a planetary gear set than parallel axis gear set.

Lubrication flexibility – Planetary gear sets may be lubricated with either oil or grease.  The gears within a planetary set prevent grease from escaping, unlike standard spur gear sets, and constantly redistribute the lubrication allowing for many different mounting orientations.

Planetary gear reducers have many positive features and advantages over other types of gear reducers.  Contact ZHAOWEI today and ask about fractional horsepower planetary gearmotors for your integrated motion solution.

 

 

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