The planetary gear reducer includes at least one sun gear, which is located in the center hole of a gear carrier, and the gear carrier has a first fixed part, a second fixed part, and a third fixed part arranged in parallel intervals along the center hole; Multiple first gears are rotatably arranged between the first and second fixed parts, and multiple second gears are rotatably arranged between the second and third fixed parts. Each first gear and second gear are meshed with the sun gear, while the second ring gear is ringed and meshed with the first gear and the second gear respectively. The use of two ring gears to mesh with the first and second gears can reduce assembly difficulties and operational interference caused by phase errors in the first and second gears, and also make the overall structure more stable, effectively reducing volume. At the same time, as long as the number of teeth of the sun gear, first and second gears, and first and second ring gears is changed, it can be more elastic, easy, and easy to adjust low, medium, or high reduction ratios.

A gear reducer is a type of transmission equipment that increases the wear of its internal transmission device over time. So from what aspects should we analyze the wear problem of the internal transmission device of the gear reducer? The losses within the gear unit (gear frame and reducer) in the gear reducer include the following three aspects:

1. Sliding friction loss between teeth.

2. Losses in bearings, sliding bearings, and rolling bearings.

3. Loss of lubricating oil due to splashing and agitation.

The problem of loss in a gear reducer is related to the friction loss in the gear transmission device, the friction loss of rolling and sliding bearings, as well as the consumption and viscosity of lubricating oil.