Planetary arrangements like this accommodate a single output driven by two inputs, or a single input driving two outputs. In differential systems every member rotates. As the planet carrier turns, it delivers low-speed, high-torque output.Ī fixed component isn't always essential, though. All the planets are mounted to a single rotating member, called a cage, arm, or carrier. The planets, spaced around the central axis of rotation, mesh with the sun as well as the fixed ring gear, so they are forced to orbit as they roll. In a simple planetary setup, input power turns the sun gear at high speed. Many power trains are "comfortable" lined up straight, and the absence of offset shafts not only decreases space, it eliminates the need to redirect the power or relocate other components. The concentricity of the planet grouping with the sun and ring gears means that the torque carries through a straight line. A ring gear binds the planets on the outside and is completely fixed. Planet gears rotate around axes that revolve around a sun gear, which spins in place. The most basic form of planetary gearing involves three sets of gears with different degrees of freedom. Examining the construction and mechanics of planetary systems reveals some of the less-obvious factors that come into play. To fully understand their operation, you need details.
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Being suited for a wide range of applications – from electric screwdrivers to bulldozer power trains – these units are strong contenders when space and weight versus reduction and torque are chief concerns. Planetary gearing, with its inherent in-line shafting and cylindrical casing, is often recognized as the compact alternative to standard pinion-and-gear reducers. Dual roller bearings at the output help isolate the gearing (spur gears) from the effects of external transverse loads. Got torque? A simple planetary gear unit viewed from its delivering end.