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What are the important parameters for the selection of planetary gearbox

Industry news|2022-04-11| admin

Planetary gearbox is driven by gears enclosed in a rigid casing, and is often used as a reduction transmission between the prime mover and the working machinery. It plays the role of matching the rotational speed and transmitting torque between the prime mover and the working machine or the actuator, and is widely used in modern machinery. Today, I will introduce to you what parameters are required for the selection of planetary gearboxs.


1. The power of the motor


The function of the gearbox is to increase the torque of the motor and reduce the speed of the motor, so be sure to know the power of the motor. According to the power of the motor, we can determine the number of precision servo planetary gearboxs. Common planetary gearboxs include 42, 60, 80, 90, 115, 120, 140, 142 and 190.


Under normal circumstances, there are many motors with 8mm or 9mm shaft diameter for 40 gearbox, 11 or 14mm motor shaft diameter for 60 gearbox, 19mm or 22mm motor shaft diameter for 90 gearbox, and 24mm or 35mm motor shaft diameter for 115 gearbox. .


Second, the speed ratio


The reduction ratio of the planetary gear gearbox is an important parameter of the precision servo planetary gear gearbox. The planetary gear gearbox changes the torque and inertia moment through the reduction ratio.


The formula for the reduction ratio is the ratio of the input speed to the output speed of the planetary gearbox, that is, the reduction ratio of the planetary gearbox = input speed/output speed.

Common reduction ratio of servo planetary gearbox


Level 1: 3, 4, 5, 7, 8, 10


Level 2: 9, 12, 15, 16, 20, 25, 32, 40, 64


Level 3: 60, 80, 100, 120, 160, 200, 256, 320, 512


行星減速機選型.jpg

3. Precision

Accuracy is also an important parameter of planetary gearboxs, which can also be return clearance or backlash.


The return clearance refers to the clearance between the gears, and the return clearance is the performance parameter of the planetary gearbox


In general, the lower the return clearance, the higher the transmission accuracy of the planetary gearbox, the more expensive the planetary gearbox, the higher the transmission efficiency.

The unit of return clearance is arc minutes. Generally, the clearance below 3° is called high precision, and the clearance above 15° is called low precision.

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