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# Working principle of planetary gear reducer

Article Source： Popularity： Issuing time：2021-09-15
• Figure one
1) The ring gear is fixed, the sun gear is active, and the planet carrier is passive.
It can be seen from Figure 1 that this combination is a reduced speed transmission, usually the transmission ratio is generally 2.5 to 5, and the steering is the same.
2) The ring gear is fixed, the planet carrier is active, and the sun gear is passive.
It can be seen from the demonstration that this combination is a speed-up transmission, the transmission ratio is generally 0.2 to 0.4, and the steering is the same.
• Figure two
3) The sun gear is fixed, the ring gear is active, and the planet carrier is passive.
It can be seen from the demonstration that this combination is a reduced-speed transmission, the transmission ratio is generally 1.25 to 1.67, and the steering is the same.
4) The sun gear is fixed, the planet carrier is active, and the ring gear is passive.
It can be seen from the demonstration that this combination is a speed-up transmission, the transmission ratio is generally 0.6～0.8, and the steering is the same.
• Figure three
5) The planet carrier is fixed, the sun gear is active, and the ring gear is passive.
It can be seen from the demonstration that this type of combination is a reduced-speed transmission, and the transmission ratio is generally 1.5 to 4, and the 　　 turns in the opposite direction.
6) The planet carrier is fixed, the ring gear is active, and the sun gear is passive.
From the demonstration, it can be seen that this combination is a speed-up transmission, the transmission ratio is generally 0.25~0.67, and the direction of is reversed.
• Figure Four
7) Combining any two of the three elements into one body:
When the planet carrier and the ring gear are integrated as the active part, the sun gear is the passive part or the sun gear and the planet carrier are integrated as the active part, and the ring gear is the passive part. From the demonstration, we can see that there is no relative movement between the planetary gears. They operate as a whole, with a transmission ratio of 1, and the same direction of rotation. This kind of combination is commonly used in automobiles to form a direct gear.
• Figure 5
8) Any one of the three components is active, and the remaining two components are free: It can be seen from the analysis that the remaining two components have no definite speed output.
The sixth combination method, due to the higher speed increase, the steering of the active and passive components are reversed, and this combination is usually not used in automobiles.
The remaining seven combinations are more commonly used.
• Figure 6