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Four Key Points and Parameter Understanding in Terms of Choosing Planetary Gearbox

When purchasing planetary gearboxes, it is necessary to have a certain understanding of principles and parameters of transmission, so as to facilitate and understand the concept of planetary gearboxes and purchasing principles.

Ⅰ. Understanding of parameters of planetary gearbox

Reduction ratio: The ratio of output speed to input speed.

Number of stages: The sun gear and the planetary gears around it form an independent reduction gear train. For example, there is only one gear train in the reducer, which is called “first stage”.

Average life: It refers to the continuous working time of the reducer under the rated load and the highest input speed.

Rated output torque: It refers to the allowable output torque when working for a long time under rated load. The maximum output torque is twice this value.

Return clearance: Fix the output end and rotate the input end clockwise and counterclockwise to make the output end produce a torque of ±2% of the rated torque. There is a slight angular displacement at the input end of the reducer, and this angular displacement is the return clearance. The unit is “arc minutes”.

Lubrication method: The planetary reducer does not need to be lubricated during the entire period of use.

Full load efficiency: It refers to the transmission efficiency of the reducer under the maximum load. It is a key indicator to evaluate the reducer. The reducer with full load and high efficiency has less heat and good overall performance.

Noise: The unit is decibel (dB)A. This value is measured when the input speed is 3000 rpm, without load, and one meter away from the reducer.

Ⅱ. The four points of purchasing a planetary gearbox

  1. Selection of reduction ratio

When selecting a planetary reducer, you must first clarify the reduction ratio. After determining the reduction ratio, multiply the rated torque of the selected servo motor by the reduction ratio. In principle, the value obtained should be less than the rated output torque of the similar reducer provided in the product catalog. At the same time, the overload capacity of the drive motor and the maximum operating torque required in practice must also be considered. The required maximum working torque should be less than 2 times the rated output torque.

  1. Selection of size specifications

After satisfying the above conditions, please choose the smallest reducer. The cost of the small reducer is relatively low. If you don’t have enough space to connect the motor reducer in a straight line, you can also choose a corner reducer, which can turn the torque by 90 degrees.

  1. Selection of accuracy (return clearance)

Next, consider the return clearance of the planetary reducer. The smaller the return clearance, the higher the accuracy and the higher the cost. Users can choose a series of reducers that meet their accuracy requirements.

  1. Consider the issue of service life

Also consider lateral/radial forces and average life. The reducer with large lateral/radial force is highly reliable in installation and use, and it is not easy to cause problems. The actual life can be calculated according to the software provided by the manufacturer. Usually its average life is much longer than the life of the equipped servo motor.

Zhejiang Laifual Drive Co., Ltd. is one of professional gear suppliers. We provide LSD Shorten Thin Harmonic Gearbox, LFS Ultra Flat Harmonic Gearbox, planetary reduction drive and so on. Want to know more? Please contact us.

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