Transmission principle and characteristics of planetary reducer

First, Transmission principle of planetary reducer

The transmission structure of planetary reducer is the most efficient combination at present. The basic transmission structure is sun gear, planetary gear, inner gear ring and stage gear. The driving source starts the sun gear in the way of straight connection or connection, and the sun gear will drive the operation of the planetary gear combined with the planetary carrier. The whole planetary gear system rotates around the rotation of the outer gear ring, and the planetary carrier is connected with the output shaft to achieve the purpose of deceleration. The higher reduction ratio is accumulated by multiple sets of stage gears and planetary gears.

Second, Characteristics of planetary reducer

1. High torque and impact resistance

The structure of planetary gear is different from that of traditional parallel gear. Traditional gears are driven by the extrusion of few contact surfaces between two gears, and all loads are concentrated on a few contact surfaces, which easily leads to friction and fracture of gears. The planetary gear reducer has a larger area of 360 degree load on the contact surface of the gear. Multiple gear surfaces uniformly bear the instantaneous impact load, so that it can withstand the impact of high torque. The body and bearing parts are not damaged and broken due to high load.

2. Small size and light weight

In traditional gear reducer stage, multiple groups of large and small gears are biased to staggered transmission to reduce speed. Since the reduction ratio must be generated by the multiple ratio of two gears, there must be a certain distance between the big and small gears, so the gear box has a large space; Especially for the combination of high reduction ratio, 3 needs to have more than two reduction gear boxes to connect and combine. The structural strength is relatively weak, which makes the length of the gearbox longer, resulting in the volume and weight of the gearbox and its huge. The structure of planetary reducer can be connected repeatedly by the number of segments, and the combination of multiple segments can be completed separately. It is small in size, light in weight and light in shape, which makes the equipment more valuable.

3. High efficiency and low backlash

Because each group of gears of gear reducer only has single tooth surface contact when decelerating transmission, when the transmission torque is the same, more tooth surface stress is required. Therefore, gear design must adopt larger modulus and thickness. The larger the gear modulus is, the greater the deflection tolerance between teeth is, and the higher the gear clearance is, the more accumulated backlash between reduction ratios of each section will be. The unique multi-point uniform density of planetary gear combination, the arc envelope structure of the outer gear ring, makes the outer gear ring and the planetary gear closely combined, and the gear has a high degree of tightness. In addition to improving the high efficiency of the reducer, the equipment itself can achieve high positioning selection.