Compared with the cylindrical gear reducer, the planetary gear reducer has many unique advantages. Its remarkable features are: it can divide power when transmitting power; at the same time, its input shaft and output shaft are coaxial, that is, the output shaft and the input shaft are set on the same main axis.
Therefore, planetary gear reducer transmission has been used to replace ordinary gear transmission as a speed increaser and speed change device in various mechanical rotating systems. The main characteristics of planetary gear reducer transmission are as follows.
1. Smooth movement, strong ability to resist shock and vibration
Due to the use of several planetary gears with the same structure, they are evenly distributed around the central wheel, so that the forces of the planetary gears and the rotating arm can be balanced with each other. At the same time, the coaxial reducer also increases the number of teeth involved in meshing, so the movement of the planetary gear transmission is stable, the ability to resist shock and vibration is strong, and the work is more reliable.
2. The transmission is relatively large, which can realize the synthesis and decomposition of motion
As long as the type of planetary gear transmission and the tooth matching scheme are properly selected, a large rotation ratio can be obtained with a few gears. In the planetary gear reducer transmission only as a transmission motion, its transmission ratio can reach several thousand. It should be pointed out that the planetary gear transmission can still maintain many advantages such as compact structure, small mass and small volume when its transmission ratio is large. Moreover, it can also realize the synthesis and decomposition of motion and realize complex motion with various speed changes.
3. The planetary gear reducer is small in size, small in mass, compact in structure and large in carrying capacity
Due to the fact that the planetary gear transmission has a power split and each center wheel forms a coaxial transmission and a reasonable application of an internal meshing gear pair, the structure can be very compact. In addition, several planetary gears are evenly distributed around the central wheel to share the load, so that the load on each gear is smaller, and these gears are allowed to use smaller modules. In addition, the coaxial reducer makes full use of the large internal meshing bearing capacity and the accommodating volume of the inner gear itself in terms of structure, which is conducive to reducing its outline size, making it small in size, small in mass, very compact in structure, and in carrying capacity. big. Generally, the outline size and mass of planetary gear transmission are about 1/2~1/5? of ordinary gear transmission (that is, under the same load conditions).
4. The planetary gear reducer has high transmission efficiency
Due to the symmetry of the planetary gear transmission structure, that is, it has several evenly distributed planetary wheels, the reaction forces acting on the center wheel and the rotating arm bearing can balance each other, which is beneficial to improve the transmission efficiency. When the transmission type is properly selected and the structure arrangement is reasonable, the efficiency value can reach 0.97~0.99.