Compared with cylindrical gear reducer, planetary gear reducer has many unique advantages. Its obvious characteristics are: it can realize output power separation when transmitting driving force; At the same time, the input shaft and the output shaft have coaxial linearity, that is, the output shaft and the input shaft are installed on the same main centerline. Therefore, planetary gear reducer transmission has been used to replace the general gear transmission as the speed increaser and speed change device in the rotating system software of various mechanical equipment. The main features of planetary gear reducer transmission are as follows: 1. The strength of stable operation, impact resistance and vibration resistance is strong, because multiple planetary gears with the same structure are used, which are evenly distributed around the center wheel, so that the performance and force of the planetary gear and the rotating arm can be balanced with each other. At the same time, the coaxial reducer also increases the number of teeth participating in meshing, so the fitness exercise of planetary gear transmission is stable, has strong strength to resist impact and vibration, and is reliable in work. 2. The transmission is relatively large and can complete the synthesis and dissolution of motion. Only by reasonably selecting the category of planetary gear transmission and gear matching plan, a very large rotation ratio can be obtained with a few gears. In the transmission of planetary gear reducer which is only used to transmit fitness sports, its transmission ratio can be several thousand. It should be emphasized that when its transmission ratio is very large, planetary gear transmission can still maintain many advantages, such as compact structure, small quality, small size and so on. Moreover, it can also complete the synthesis and dissolution of sports and establish a variety of complex fitness sports. 3. The planetary gear reducer has the advantages of small size, small quality, compact structure and large bearing capacity. Because the planetary gear transmission has the transmission of separating output power, forming a common centerline with each central wheel and effectively using the internal gear pair, it can make its structure very compact. In view of the fact that multiple planetary gears are evenly distributed around the center wheel to bear the load together, so as to make each gear bear less load, and a smaller displacement coefficient can be selected for this gear. In addition, the structure type of coaxial reducer flexibly uses the internal gear engagement bearing capacity and the energy capacity of diamond grade internal gear, which helps to reduce its external contour specification, making it small in size, small in quality, very compact in structure and large in bearing capacity. 4. The transmission efficiency of planetary gear reducer is high because of the symmetry of planetary gear transmission structure, that is, it has multiple evenly distributed planetary gears, which promotes the balance between the recoil force in the center wheel and the rotating arm rolling bearing, which is beneficial to improve the transmission efficiency. When the transmission type is properly selected and the structure layout is effective, the high efficiency value can reach 0.97 ~ 0.99.
