How to calculate the reduction ratio of the planetary reducer?

The reduction ratio of the planetary reducer, that is, the transmission ratio of the reduction gear, is a kind of transmission ratio, which refers to the ratio of the instantaneous input speed to the output speed in the reduction mechanism, which is represented by the symbol "i". Formula: n1/n2=i, the definition calculation method: reduction ratio = input speed ÷ output speed, the ratio of the connected input speed to the output speed, if the input speed is 1500r/min, the output speed is 25r/min, then it will decelerate The ratio is: i=60:1

(1) The ring gear is fixed, the sun gear is active, and the planet carrier is passive. This combination is a reduced speed transmission, usually the transmission ratio is generally 2.5-5, and the steering is the same.

(2) The ring gear is fixed, the planet carrier is active, and the sun gear is passive. This kind of combination is a speed-up transmission, the transmission ratio is generally 0.2 to 0.4, and the steering is the same.

(3) The sun gear is fixed, the ring gear is active, and the planet carrier is passive. 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. This kind of combination is a speed-up transmission, the transmission ratio is generally 0.6 to 0.8, and the steering is the same.

(5) The planet carrier is fixed, the sun gear is active, and the ring gear is passive. This kind of combination is a reduced speed transmission, the transmission ratio is generally 1.5 to 4, and the direction of rotation is reversed.

(6) The planet carrier is fixed, the ring gear is active, and the sun gear is passive. This kind of combination is a speed-up transmission, the transmission ratio is generally 0.25 to 0.67, and the direction of rotation is opposite.

(7) Combining any two of the three elements into one body: when the planet carrier and the ring gear are combined as an active part, the sun gear is a passive part or the sun gear and the planet carrier are combined as an active part. The movement of the circle as a passive component. There is no relative movement between the planetary gears, and they operate as a whole, with a transmission ratio of 1, and the same direction of rotation.

(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 greater 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.

Gear train calculation method: reduction ratio = driven gear tooth number ÷ driving gear tooth number. The calculation method of the reduction ratio of belts, chains and friction wheels: reduction ratio = driven wheel diameter ÷ driving wheel diameter.