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Structural composition of planetary gear

Release time:

2020-07-23

Changzhou planetary gear refers to a gear system that can rotate around its own axis like a fixed shaft gear, and its axis also rotates with the planet carrier around the axis of other gears. Rotation around one's own axis is called "rotation", and rotation around other gear axes is called "rotation", just like the planets in the solar system, hence the name.

The simple (single row) planetary gear mechanism is the basis of the transmission mechanism. Generally, the speed change mechanism of the automatic transmission is composed of two or more rows of planetary gear mechanisms. A simple planetary gear mechanism comprises a sun gear, several planet gears and a ring gear, wherein the planet gears are supported by a fixed shaft of a planet carrier, allowing the planet gears to rotate on the supporting shaft. The planetary gear, the adjacent sun gear and the ring gear are always in a constant meshing state, and helical gears are usually used to improve the working stability.

In a simple planetary gear mechanism, the sun gear is located at the center of the planetary gear mechanism, the sun gear and the planetary gears are always meshed, and the meshing rotation direction of the two external gears of the reduction accessory shaft is opposite. Just as the sun is at the center of the solar system, so is the sun gear. In addition to being able to rotate about the support axis of the planet carrier, the planet wheels will also rotate about the central axis of the sun gear driven by the planet carrier under certain operating conditions, just like the rotation of the earth and the rotation around the sun. When this happens, it is called the transmission mode of the planetary gear mechanism. In the entire planetary gear mechanism, if the planetary gear rotates, but the planetary carrier is fixed, this method is similar to the parallel shaft transmission, which is called fixed shaft transmission. The ring gear is an internal gear, which always meshes with the planetary gears, but the internal gear meshes with the external gear, and the direction of rotation between them is the same. The number of planetary gears depends on the design load of the transmission, and there are usually three or four. The greater the number, the greater the load.

A simple planetary gear mechanism is often referred to as a three-component mechanism, the three components being the sun gear, the planet carrier, and the ring gear, respectively. Reduction gear Generally speaking, if we want to determine the kinematic relationship between these three components, we need to first determine one of the components, then determine who is the driving component, and determine the speed and direction of rotation of the driving component. As a result, the driven The speed and direction of rotation of the component are determined.

Key words:

What are the characteristics and advantages of the machine axis

Introduction of Planetary Gear

What are the characteristics and advantages of the machine axis

Introduction of Planetary Gear