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Planet Reducer

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[i]. Simple planetary gears are arranged with a centrally located, externally toothed sun gear that meshes…

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[i]. 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.


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 reduction ratios – Ratios as high as 11:1 can be achieved in a single planetary gear stage whereas it is difficult to achieve much higher than 5:1 in a single parallel axis stage.  However, it is impossible for planetary sets to achieve a ratio much under 3:1 due to geometric interferences.  A parallel shaft set is not limited on low ratios as they can be as far down as 1:1 (idler gear).

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[ii].

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[iii].

Integrated housing option – The ring gear in a planetary set may be designed such that it is also the outer housing for the entire gearbox.  Reducing the number of components reduces assembly time and part cost adding to the bottom line.

Coaxial alignment & Direction of Rotation – The output shaft on a planetary gear set is “coaxially-aligned” with the motor shaft meaning they share the same axis.  The planetary output shaft also rotates in the same direction as the motor whereas the output shaft on a single-stage parallel axis gear set rotates opposite of the motor direction.  If an offset of the output shaft is desired, a parallel axis gear set may be added to the planetary set, or a full parallel axis gear set may be used.

Thermal capacity – since the size of a planetary gear reducer is smaller than that of an equal torque capacity parallel axis unit, the thermal capacity will likely not be as high on the planetary gear reducer—making this type of reducer a good fit in intermittent duty applications.  Planetary gear reducers can still run continuously, but measures may have to be taken to prevent the gearbox from overheating.


Construction equipment

Door & gate openers

Food & beverage mixers

Material handling equipment

Medical devices

Packaging equipment

Power tools

Vehicle transmissions

Wind generation

Planetary gear reducers have many positive features and advantages over other types of gear reducers.


Hot Tags: planet reducer, China, suppliers, manufacturers, factory, wholesale, buy, made in China

Product Quick Detail:

  • Standard and non-standard available
  • With high quality and competitive price
  • Prompt delivery
  • Packing as per customer’s demand.

We promise will offer the best price by the high quality in china! We also accept special order about the products. If you are interested in our products. Please do not hesitate to let us know.We are pleased to give you the detailed information.We promise that our products would be safety and were in high quality and reasonable price. If you are interested in our products, please contact us asap.We are sincerely looking for your cooperation.

Most of our products are exported to Europe or Americas, both standard and nonstandard products available. We can produce as per your drawing or sample. Material can be standard or as per your special request. If you choose us, you choose reliable.

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Materials Available

1. Stainless Steel: SS201, SS303, SS304, SS316, SS416, SS420
2. Steel:C45(K1045), C46(K1046),C20
3. Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)
4. Bronze: C51000, C52100, C54400, etc
5. Iron: 1213, 12L14,1215
6. Aluminum: Al6061, Al6063
7.OEM according to your request
product materials available

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly
product finishing

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port
product packages


Q: Are you trading company or manufacturer ?
A: Our group consists in 3 factories and 2 abroad sales corporations.

Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: How long is your delivery time ? What is your terms of payment ?
A: Generally it is 40-45 days. The time may vary depending on the product and the level of customization. For standard products, the payment is: 30% T/T in advance ,balance before shipment.

Q: What is the exact MOQ or price for your product ?
A: As an OEM company, we can provide and adapt our products to a wide range of needs.Thus, MOQ and price may greatly vary with size, material and further specifications; For instance, costly products or standard products will usually have a lower MOQ. Please contact us with all relevant details to get the most accurate quotation.

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