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Planetary Gearbox

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There are three main components in a planetary gearbox: the sun gear, the planet gears and the ring gear. The gears are attached to the planet carrier that has teeth on the inside, which is the ring gear. Read More…

Planetary Gearbox A planetary gearbox is a mechanism that lowers the speed or torque of a rotating input shaft by using a system of gears that revolves around a central gear.
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Leading Manufacturers

Bloomingdale, IL  |  630-980-1133

We offer premium speed reducers and motion control components. These deluxe parts are designed for a wide range of purposes and our engineers are willing to assist you with determining the best speed reducer.

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DieQua Corporation $$$

Cleveland, OH  |  800-423-3169

Cleveland Gear Co. has specialized in speed control technology including a variety of quality manufactured speed reducers since 1912. We have successfully developed speed reducers for material handling, mineral processing, and more. You will find that our products have uncompromising quality, making all others less than the best. We will fulfill your exact requirements and that's what continues to make Cleveland Gear one of the top manufacturers in our industry.

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Cleveland Gear Company $$$

Cleveland, OH  |  800-676-2839

Since 1980, Matex Products has been a supplier of Matex gear modules that are patented in both the United States and Japan. We specialize in gear motors, gear assemblies, planetary gear reducers, gear boxes and gear heads. We serve a variety of industries with high-quality, low-cost products.

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Matex Products Inc. $$$

Duluth, GA  |  800-956-6728

Speed reducers from Framo Morat provide you with all the freedoms and options, because we offer you the right solution for any application, no matter how specialized it is. Our G-series includes the high-end gearbox lines GSD (flange gear), GSB (inline) and GSBL (angle gear) as well as the high-end economy lines GSN and GFE. For custom engineered drive solutions tailored completely to your individual specifications, you benefit from our expertise in development and systems, which has been growing for decades. For more information about our speed reducers call Framo Morat today!

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Framo Morat, Inc. $$$

Chesapeake, VA  |  757-485-8218

Sumitomo Drive Technologies is on the move supplying quality power transmission products. As one of the largest speed reducer manufacturers and global leader in power transmission innovation, we are ISO 9001:2000 certified. Check our inventory of concentric, right angle, offset parallel, precision & large industrial gearboxes, gearmotors, gearheads & speed reducers. Plus, our AC drives & more.

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Sumitomo Machinery Corporation of America $$$
placeholder image DieQua Corporation Cleveland Gear Company Matex Products Inc. Framo Morat, Inc. Sumitomo Machinery Corporation of America

Planetary gearboxes are able to produce many different reduction ratios because of the different planet gears that revolve around the sun gear. Planetary gearboxes are constructed of heavy duty metal such as steel and are able to handle large shock loads well. However, different planetary gearboxes are designed for specific speed, load and torque capacities. The predominant use for planetary gearboxes is in motor vehicles with automatic transmissions. Unlike manual transmission, in which the operator is responsible for switching gears, automobiles that have automatic transmissions use clutches, brake bands and planetary gearboxes to change the inputs and outputs, thereby adjusting the speeds accordingly.

An automatic transmission contains two complete planetary gearsets placed together into one component. Planetary gearboxes are also used in electric screwdrivers, sprinklers and applications that require large or multiple reductions from a compact mechanism. Planetary gearboxes are one of many variations of speed reducers and it is important that the right mechanism is used. Gearboxes may even be combined to produce the desired results and the most common kinds are helical gear reducers, worm gear reducers and inline gear reducers.

Planetary gearboxes gain their advantages through their design. The sun gear's central position allows the planet gears to rotate in the same direction and for the ring gear (the edge of the planet carrier) to turn the same way as the sun gear. In some arrangements the sun gear can simultaneously turn all the planets as they also engage the ring gear. Any of the three components may be the input, the output or held stationary, which results in many different reduction ratio possibilities.

In many planetary gearboxes one component is held stationary with another component serving as the input and the other as output. The reduction ratios for planetary gearboxes are dependent upon the number of teeth in the gears and what components are engaged. Generally, the load ability and torque increases with the number of planets in the system because the load is distributed among the gears and there is low energy waste; planetary gearboxes are highly efficient, averaging between 96 and 98%. The design is complex, however, and difficult to access for repairs or maintenance.

Planetary Gearbox Informational Video