Planetary gear transmission as compared with conventional gear transmission, it has many unique advantages. Its most notable feature is: when the power is transmitted it can be power split; at the same time, the input shaft and the output shaft has a coaxial, the output shaft and the input shaft are provided on the same axis line. Therefore, the planetary gear transmission has now been used instead of conventional gear drive, and as a variety of mechanical transmission gearbox and transmission. Planetary gear

The main features of the planetary gear as follows.

    1, small size, low weight, compact structure, large carrying capacity due to the planetary gear transmission with power split and each constituting the center wheel gear with inner coaxial type transmission and reasonable application, thus making it very compact. Since then around the center wheel evenly distributed number of planetary gears to jointly share the load so that the load on each gear is small, and allows them to use smaller gear modulus. In addition, the structure takes full advantage of the large carrying capacity of the ring and the inner ring can accommodate the volume itself, thus contributing to narrowing the outer profile size to small size, low quality, extremely compact, and large carrying capacity. In general, the planetary gear overall dimensions and weight of about ordinary gear 1/2 ~ 1/5 (ie bear the same load conditions).

    2, high transmission efficiency due to the symmetry of the planetary gear transmission structure, and that it has a number of symmetrical distribution of the planetary gear, so that the role of the central wheel and the pivot arm in the bearing reaction forces can balance each other, which will help to improve the transmission efficiency effect. In selecting the appropriate drive type, the structural arrangement reasonable in the circumstances, the efficiency value of up to 0.97 to 0.99. Planetary gear

    3, the drive is relatively large, synthesis and decomposition can be appropriately selected as long as the movement of the planetary gear type and gear with the program, you can use a few gears and get a great ratio. In only as a passing movement of the planetary gear transmission, the transmission ratio may reach several thousand. It should be noted, in which the planetary gear transmission ratio is large, it can still maintain a compact, low weight, small size and many other advantages. Moreover, it can achieve the synthesis and decomposition of movement and complex movement of various shifts.

    4, smooth motion, the ability to shock and vibration is strong due to the number of the same structure as the planets round, evenly distributed around the center of the wheel in order to make the force of the planetary gear and the boom are in equilibrium. It also allows the number of teeth meshing participation increased steadily so that the planetary gear movement, a strong resistance to shock and vibration, work more reliable.

    In short, the planetary gear has a small mass, small volume, transmission ratio and efficiency advantages. Thus, the planetary transmission is not only suitable for high speed, high power, but also in the low speed and high torque transmission also has been applied. It is applicable to almost all the power and speed range, it is now planetary transmission technology has become one of the key countries in the world mechanical transmission development. Planetary gear