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 Moreā€¦

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.

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. As a premier turnkey manufacturer we offer fast turnaround on our solutions. Turn to us for top of the line speed reducers. Our engineers are ready and willing to assist you today!

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DieQua Corporation $$$

Freeport, NY  |  888-260-7466

Ondrives.US is committed to providing our customers with budget friendly speed reducers. With our vast inventory and capabilities, we are sure to have the exact product that you have been looking for. Customization is also available in order to fit your unique needs. We are ISO 9001:2015 certified. Visit our website today!

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Ondrives.Us Corp. $$$

Peabody, MA  |  800-921-3332

Harmonic Drive is a world leader in the design and manufacture of zero backlash, high-ratio harmonic drive gear heads, speed reducers and gear reducers. Standard and customer-specific units are available with less than 1 arc minute positional accuracy and +/- 5 arc seconds repeatability.

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Harmonic Drive, LLC $$$

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. $$$

Farmington Hills, MI  |  248-553-3020

Our worm gear boxes have been serving customers all around the world since we first opened our doors. Our dedicated teams of staff members will work with you closely from prototype to production to ensure that we are offering the exact products that you have been searching for! To learn more about what we may be able to do for you; get in touch with our friendly customer service representatives today!

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Nabtesco Motion Control, Inc. $$$
placeholder image DieQua Corporation Ondrives.Us Corp. Harmonic Drive, LLC Matex Products Inc. Nabtesco Motion Control, Inc.

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