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High Precision Planetary Gearbox for Servo Motor

We manufacture and supply high-precision planetary gearboxes that are widely used in various motion control applications and also in various industrial applications. Their high-precision planetary gear units are ideally suited for applications requiring high torque and precision. In addition to being highly reliable, these gear units offer excellent performance, low maintenance costs and compact dimensions.

Precision Planetary Gearbox

WLY manufactures and supplies high-precision planetary gearboxes that are widely used in various motion control applications and also in various industrial applications. Their high-precision planetary gear units are ideally suited for applications requiring high torque and precision. In addition to being highly reliable, these gear units offer excellent performance, low maintenance costs and compact dimensions.

A low-backlash servo planetary gearbox is an essential component of a servo system. While this type of gearbox is used to drive rotating loads, it is also an excellent choice for applications where continuous S1 operation is required. The precision planetary gearbox has low inertia, which benefits servo applications. The gearbox itself has inertia that is directly proportional to its load inertia. Planetary gearboxes are lubricated with oil or grease and require no re-lubrication or maintenance.

The main differences between a planetary gearbox and a conventional pinion-and-gear reducer are the size and shape of the ring gears. A planetary gearbox is more compact than a conventional pinion-and-gear reducer. In addition to its compact design, a planetary gearbox is ideal for a wide range of applications that have space or weight restrictions.

The advantages of a servo planetary gearbox over a traditional pinion-and-gearbox geared motor include a low moment of inertia and a compact footprint. A servo planetary gearbox can be made with a wide range of ratios and sizes to suit a particular application.

Components of High Precision Planetary Gearbox

  • Gearbox Housing & Flange: Aluminum-alloy Die Casting ADC12
  • Gearset: Precision Planetary Gear Set
    Ring Gears: 40Cr
    Planetary Gears: 20CrMnTi, Surface Hardness HRC58~62, Inner Hardness HRC33~40
  • Input Configurations: Keyed Hollow Shaft with Motor Adaptor
  • Output Configurations: Keyed Solid Shaft Output
  • Applicable Motors: Servo Motors, Stepper Motors

Servo Motor Gear Box

Features of Precision Servo Motor Planetary Gearbox

With a compromise of advanced technology both at home and abroad, the main features of high-precision planetary gearboxes are as follows:

  • Low Noise: Under 65db.
  • Low Backlash: Backlash is under 3 arcmin. Backlash for 2-stage speed reduction is within 5 arcmin.
  • High Efficiency: Efficiency for 1-stage model exceeds 95%, and for 2-stage model exceeds 92%.
  • High Input Speed: Input speed allows for up to 8000 RPM.
  • High Torque: Higher torque output than that of conventional planetary gear reducers.
  • High Stability: Employs high tensile strength alloy steel. Gear hardening is made for the entire gear instead of only surface hardening, which extends gear service life and maintains high accuracy as new after a long period of operation.
  • High-Speed Reduction Ratio: The gear reducer is a modular design. The precision planetary gearbox can be connected. Speed reduction ratio is over 1/1000.

Precision Planetary Gearbox

WLY Series High Precision Planetary Gearbox for Servo Motor

Series Sizes Output torque Ratio Backlash
1-stage 2-stage 1-stage 2-stage
BAB Series 7 sizes 14Nm-2000Nm 3/4/5/6/7/8/9/10 15/20/25/30/35/40
≤1, ≤3, ≤5 arcmin ≤3, ≤5, ≤7 arcmin
BAD Series 7 sizes 14Nm-2000Nm 4/5/6/7/8/10 20/25/30/35/40
≤1, ≤3, ≤5 arcmin ≤3, ≤5, ≤7 arcmin
BAE Series 7 sizes 14Nm-2000Nm 3/4/5/6/7/8/9/10 15/20/25/30/35/40
≤5 arcmin ≤8 arcmin
BABR Series 7 sizes 9Nm-2000Nm 3/4/5/6/7/8/9/10/14/20 15/20/25/30/35/40/45/50/60/70
≤2, ≤4, ≤6 arcmin ≤4, ≤7, ≤9 arcmin
BADR Series 7 sizes 14Nm-2000Nm 4/5/6/7/8/10/14/20 20/25/30/35/40
≤2, ≤4, ≤6 arcmin ≤4, ≤7, ≤9 arcmin
BAF Series 7 sizes 14Nm-2000Nm 3/4/5/6/7/8/9/10 15/20/25/30/35/40
≤5 arcmin ≤8 arcmin
BPG/BPGA Series 10 sizes 9Nm-423Nm 3/4/5/7/8/10 12/15/20/25/30/35/40
≤6, ≤8 arcmin ≤8, ≤10 arcmin


Application of Precision Planetary Gearbox

Precision Planetary Gearbox is widely used in the following fields:

  1. Aerospace, military industry.
  2. Medical health, electronic information industry.
  3. Industrial robots, Production automation, CNC machine tool manufacturing industry.
  4. Motor, textile, printing, food, metallurgical, environmental protection engineering, warehouse logistics industry.

Low Backlash Precision Planetary Gearbox for Servo Motor

Precision Planetary Gearbox Installation Instructions

Motor installation instruction

1.  Double-check the motor and gearbox size. Clean the mounting surface.

2. Remove the plug on the adapter plate. Rotate the set collar till the bolt is line up.

Precision Planetary Gearbox Installation

3. a: Remove the motor key. b: Insert balance key.

4. Check motor shaft size and insert bushing if necessary.

Precision Planetary Gearbox Installation

5. Set as vertical position. Tighten the mounting bolts (including washer) in 1-4 order with a wrench to 5% specified torque.

6. Tighten the set collar bolt with a torque wrench to the specified torque.

Precision Planetary Gearbox Installation

7. Tighten the mounting bolts in 1-4 order with a wrench to the specified torque.

8. Tighten back the screw plug.

Precision Planetary Gearbox Installation

Gearbox installation instruction

Jointing with reducer in case of jointing a reducer with the device, make sure that the combining side is plane without inconsistency, and when assembling reducer onto equipment, ensuring assembly surface smooth.

Connection to the output shaft

When assembling a coupling, pulley, etc. onto the output shaft, make sure that excessive axial load not be given to the output shaft.

In case of strongly hitting the shaft with a hammer, the shaft, make sure that excessive axial may be damaged, therefore it shall be prohibited.

If the shaft or key of a coupling assembled is loosed, it may cause carbonization, so be careful when assembling.

For assembling a coupling, fix the key with a set bolt.

Please adjust the shaft center carefully in connecting.

More about WLY Precision Planetary Gearbox

Exterior Color of Precision Planetary Gearbox

Shell + back cover:

  1. Champagne gold + black.
  2. Innovative blue + pearl silver.
Precision Planetary Gearbox


Storage of Precision Planetary Gearbox

  • Under roof, protected against rain and snow, avoid shock loads.
  • Underlay the block and other material between the ground and equipment.
  • The opened but not used gear units should be added with the anti-corrosive oil on its surface, and then return to the packing containers timely.
  • Two years or more given regular inspections. Check for cleanliness and mechanical damage as part of the inspection and check corrosion protection.

Routine Inspection

Check whether there is any leakage of grease.

During operation, check whether the surface temperature of the reducer is abnormally high. (Environmental temperature is less than +50 degrees Celsius.)

Check whether there is any abnormal vibration of the reducer.

Check whether there is any abnormal sound in the bearing and gear parts.

Additional information



pruduct quality report

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

Eight reasons to choose us:


1. Perfect service system and after-sale protection.
2. Quality problems will be solved within 24hours.
3. One-to-one customer service tracking processing.
4. Companies carry out the ERP management, improve enterprise fast response.
5. Quality assurance, one year warranty.
6. Supporting professional matched other equipments.
7. The company has more than one product testing units, the implementation of ISO9001: 2015.
8. Unique development and design capabilities to meet the needs of special-purpose equipment manufacturing.


Five Core strengths:


1. The first domestic independent R & D manufacturer and 22 years of professional manufacturing.
2. Casting exquisite, beautiful, practical and durable.
3. Complete specifications, cost-effective and spot supply.
4. Independent research and development, special specifications can be customized.
5. Selected materials, high-tech treatment, up to the international standard test.

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


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.