What is the reason for the "strange noise" emitted by the planetary gearbox? How can it be solved?

Release Time：

2025-03-02

The selection of planetary gearbox should comprehensively consider economy, accuracy, noise, and temperature rise, and choose according to the actual situation. This article shares with you the knowledge of planetary gearbox selection, how to avoid the "strange noise" of planetary gearboxes, and meet the needs of engineers who need both.

What is the reason for the "strange noise" emitted by the planetary gearbox? How can it be solved?
The selection of planetary gearbox should comprehensively consider economy, accuracy, noise, and temperature rise, and choose according to the actual situation. This article shares with you the knowledge of planetary gearbox selection, how to avoid the "strange noise" of planetary gearboxes, and meet the needs of engineers who need both.

Before discussing selection knowledge, let's first understand the operating principle of planetary gearboxes.

The operating principle of planetary gearbox

As a common transmission mechanism, planetary gearbox has the characteristics of small size, good sealing, high transmission accuracy, large transmission torque, and easy installation. The planetary gear reducer is internally meshed with a sun gear and a planetary gear. The sun gear drives the planetary gear, which in turn rotates the planetary carrier and output shaft, thereby achieving deceleration and torque amplification.

Sun gear rotation and planetary gear revolution: When the sun gear rotates under external power, it meshes with the planetary gears, forcing them to rotate on their own. At the same time, due to the meshing of the other side of the planetary gear with the ring gear, the ring gear is fixed, forcing the planetary gear to revolve around the sun gear along the trajectory of the ring gear while self propagating.

Power transmission: The rotation and revolution of planetary gears work together on the planet carrier, transmitting power to the output shaft through the planet carrier to achieve the purpose of deceleration and torque amplification.

In addition, the selection process of planetary gearboxes often requires attention to the relationship between accuracy, noise, and temperature rise. Among them, accuracy has a direct impact on noise and temperature rise.
Generally speaking, the factors causing noise and temperature rise in planetary gearboxes are transmission resistance. The greater the resistance, the louder the noise and the more severe the heating. The higher the precision of the planetary gearbox and the lower the transmission resistance, the lower the noise and the less heat generated.

What are the factors that determine the accuracy of planetary gearboxes?

1. The precision of helical gear transmission is higher than that of spur gear transmission
During meshing, the contact line of helical gears increases from short to long and then to short, while spur gears enter and exit meshing as a whole. Therefore, the impact of helical gears during meshing and disengagement is smaller, the transmission is smoother, and it is more conducive to maintaining high-precision transmission.

2. The accuracy of the double support structure is better than that of the single support structure
Compared to single support structures, double support structures have high load capacity, impact resistance, and maintain stability during the operation of planetary gears, thereby ensuring the accuracy of transmission.