What are the advantages of 3 stage planetary gearboxes?
The planetary gearbox is divided into single stage planetary gearbox, two stage planetary gearbox and three stage planetary gearbox according to the number of sets of planetary gear sets of internal core transmission components, among which the first-stage and two-stage planetary gearbox are the most common planetary gearbox, but three-stage planetary gearbox is rare.
The concept of planetary gearbox series
The number of stages refers to the number of sets of planetary gears in the gearbox.
The basic transmission structure of the planetary gearbox is: planetary gear, sun gear and ring gear. The planetary gear, sun gear, and ring gear of the planetary gearbox form a set of planetary gear sets. One set is called a first-stage planetary gearbox. It means that there are three sets of planetary gear sets inside.
Since a set of planetary gears cannot meet a large transmission ratio, sometimes 2 or 3 sets are required to meet the user’s requirements for a large transmission ratio. Due to the increase in the number of planetary gears, the length of a 2-stage or 3 stage gearbox will increase. increase, the efficiency will decrease.
Internal structure diagram of single stage planetary gearbox
Internal structure diagram of two-stage planetary gearbox
Internal structure diagram of 3 stage planetary gearbox
Compared with the single-stage planetary gearbox, the 3 stage planetary gearboxes shows a variety of advantages, so despite its higher requirements in production and more expensive, there will be a large number of people choose to use such a reduction device. In fact, in the current use of equipment, some high standard machinery and equipment is the need for such a gearbox to complete production tasks.
Three planetary gearbox compared to two planetary gearbox has the advantages of: greater reduction ratio, greater output torque, a wider range of deceleration, gear box return clearance accuracy and other advantages; at the same time has a small size, light weight, smooth operation, low noise, performance safety features. It also has the characteristics of power shunt and multi-tooth meshing.
Through the production of 3 stage planetary gearbox can enhance the stable work in the instantaneous constant transmission ratio, so that the whole process of operation can be completed in a gentle process, rather than like other types of gearbox will appear speed, torque fluctuations, thus harming the entire reduction device.
In addition, the three-stage Planetary gearbox has a small radial dimension, which can significantly reduce its volume and weight, and it is easier to assemble.
Planetary gearbox level classification: one level of reduction (generally less than 10:1), two level of reduction (generally greater than 10:1 and less than or equal to 200:1), three level of reduction (some brands do not have a third level, the maximum reduction ratio to achieve 100:1, the general principle of division is greater than 100:1); 3 stage planetary gearbox transmission efficiency, reduction ratio, high torque.