中

News

Home > News > 行业动态 > Selection of planetary gearbox speed ratio

Selection of planetary gearbox speed ratio

Release time：2020-01-03
Publisher: Admin
Reduction ratio is one of the professional terms for planetary gearboxes, generally represented by the letter i. Reduction ratio is the three main parameter values that a planetary gearbox changes to a certain motion, which changes the speed, torque, and inertia moment through the reduction ratio of the planetary gearbox.
Calculation formula for reduction ratio
The reduction ratio can be calculated based on the input speed and output speed of the planetary gearbox, with the formula of input speed/output speed=reduction ratio of the planetary gearbox.
Precision planetary gearbox is a relatively precise mechanical device used to reduce speed and increase torque. According to the different transmission stages, it can be divided into single-stage and multi-stage reducers. A single-stage reducer refers to a reducer with a smaller reduction ratio, while a two-stage reducer has a larger reduction ratio. The larger the reduction ratio, the more the speed is reduced, and the slower the output speed, but the greater the increased torque.
There are different algorithms depending on the output institution
Using common mechanisms, the internal gear ring is fixed and the force is applied to the central sun gear, while the planetary gear carrier outputs
Then it is (number of inner ring teeth/number of sun teeth)+1, taking the commonly used reducer for servo motors as an example with a reduction ratio of 1/10
The number of teeth on the inner ring gear is usually 108, so the number of teeth on the sun gear is 108/(10-1)=12 (teeth)
It can be inferred that the reduction ratio of 1/5 for the sun gear is 108/(5-1)=27 (teeth)
So we can understand why such mechanisms with a reduction ratio of 1/10 cannot achieve * * output torque. That's why
Common reduction ratios for planetary gearboxes
Level 1: 3, 4, 5, 7, 10
Level 2: 15, 20, 30, 35, 40, 50, 70, 90, 100
Among them, the reduction ratios of 6, 8, and 9 are relatively rare.
So, with a constant power and speed, the larger the speed ratio, the greater the torque. The smaller the speed ratio of the servo reducer, the smaller the output torque and the faster the output speed.
Back to list
Latest articles
Related reading

Product

MORE
Website
About us
Product
Application
News
Contact
  • Sales：

    18616662226

  • Personnel：

    021-34975005

  • Email：

    sty-gear@sty-gear.com

  • Address：
    558 Xindan Road, Qingpu District, Shanghai
Links： 汇川电机网站 Yaskawa Electric Mitsubishi Electric Delta Electromechanical Panasonic Motor

Copyright © 2026 Shangying Transmission Technology (Shanghai) Co., Ltd

沪公网安备 31011202009509号 | 沪ICP备19024309号-1