What is the number of teeth of the planetary gear, the sun gear, and the inner ring?
Generally, the planetary gear has the least number of teeth, followed by the sun wheel and the inner ring gear.There is no definite relation between the number of teeth, but the transmission ratio is different depending on the number of teeth
In addition to being able to rotate around its own axis of rotation (B-B), such as a fixed axis gear, the planetary gear rotates with the blue support (known as the planet gear) around the axis of the other gear (A-A). The rotation around one's axis is called rotation, and the rotation of the other axis of the gear is called revolution, hence the name of the planet in the solar system.
The relationship between the number of teeth of the planetary gear, the sun gear and the inner ring gear is as follows:If there is no standard gear of the gear meshing, is that each round of direct indexing gear tangent for pure rolling. That is to say the sun gear pitch diameter pitch diameter (D1) and two planetary gear (D2) pitch diameter is equal to the needs of the ring gear, and the gear (D3) to be engaged, the modulus is must be the same, so that they can make reference diameter of common divisor modulus, equality on both sides of the relationship is the removal of modulus, tooth number, is the number of planet gear sun wheel tooth number plus two times and so on gear tooth number. But if the gear has been shifted, this equation may not be true, because although the diameter of the indexing circle does not change after the gear is shifted, the pitch diameter of the simulated gear for pure rolling will no longer be the diameter of the dividing circle. It won't make any difference. Because there are many possibilities of displacement.
