sales@zwgearbox.com |
Zhaowei Machinery & Electronics Co., Ltd.

What are Planetary Gear Sets?

Publish Time: Author: Site Editor Visit: 1224

A planetary gear set consists of the planet gear, sun gear, and inner ring, and is known as a single-stage planetary gearbox. Planetary gears stage numbers are indicative of the number of planetary gear sets. A planetary reducer consists of a planetary gearbox and a motor. The backlash of planetary reducers: fix the output end, and rotate the input end clockwise and counterclockwise to make the input end produce rated torque ( +-2% torque). The input end of the planetary reducer has a slight angular displacement, which is the return clearance. The unit is known as "arc minute", which equals to one-sixtieth of a degree. Some refer to it as backlash. A planetary reducer is a widely used industrial product. It reduces the speed of the motor while increasing the output torque. The planetary reducer can be used as a supporting component in industries such as lifting, excavation, transportation, and construction.  

planetary-gearbox

As mentioned above, one set of the planetary reducer is called a single-stage gear reducer. A second-stage planetary reducer means that there is a two-stage planetary gear system, and a three-stage planetary reducer means that there is a three-stage planetary gear system. Since a set of planetary gears cannot reach a larger transmission ratio, sometimes 2 or 3 sets are needed to meet the user’s requirements to achieve larger transmission ratios. Due to the increase in the number of planetary gear sets, the overall length of the 2-stage or 3-stage reducer increases, decreasing efficiency. 

Generally, the number of stages of the planetary reducer is divided into 1, 2, and 3. The commonly used reduction ratio of planetary reducer:

  • Level 1: 3, 4, 5, 7, 10
  • Level 2: 15, 20, 30, 35, 40, 50, 70, 90, 100

The difference between the single-stage planetary gearbox and two-stage planetary gear train:

  1. The difference in the number of gear sets.
  2. The difference in efficiency, the efficiency of the two-stage planetary gear train is lower than that of the single-stage gear reducer.
  3. The difference in length, the two-stage planetary reducer is longer lengthwise than the single-stage planetary reducer.
  4. The difference in transmission ratio, the two-stage planetary gear train has a larger transmission ratio than the single-stage planetary gearbox.

Recommend Products

Tell Us About Your Application Requirements

ZHAOWEI team is glad to help you choose the right micro gear motor to optimize your application. Please fill out the form below with the necessary information and our representative will respond to you as soon as possible.

Customer Service

ZHAOWEI’s micro drive systems apply in diverse areas all around the world to deliver the power, precision, and efficiency to motion solutions. Our sales and engineering support teams are ready to assist you with any questions, including quotation, application support, and product configuration. Please submit your requirements through our Custom Service Form to ensure a faster response.

This website uses cookies

This website uses anonymous performance cookies to ensure you get the best experience on our website. We never use targeting or advertising cookies. Find out more: Cookies Policy