The Features and Transmission Principle of Planetary Reducer

- Jan 11, 2021-

The basic transmission structure of planetary reducer include sun gear, planetary gear, internal gear ring, connecting gear, planet carrier and output shaft. It has multiple characteristics of high torque, impact resistance, small size and light weight. Now let's have a look at the transmission principle of planetary reducer in detail below.


Features :

1. High torque and impact resistance

The structure of planetary gears is different from that of traditional parallel gears. The traditional gear relies on the few contact surfaces between the two gears to be squeezed and driven. All the load is concentrated on the few gear surfaces, friction and fracture of the gear can be occurred easily. The planetary reducer has a 360-degree load on the gear contact surface with a larger area, and multiple gear surfaces can evenly bear the instantaneous impact load, so that it can withstand the impact of higher torsion, and the body and various bearing parts are not damaged due to high load.


2. Small size and light weight

The traditional gear reducer stage is decelerated by multiple sets of large and small gears in a staggered transmission. Because the reduction ratio must be produced by the multiple ratio of the two gears, there must be a certain interval between the large and small gears, so the gear box contains large space; It has to combine more than two reduction gearboxes especially high speed reduction, as structural strength is relatively weak and the length of the gearbox is lengthened, resulting in a huge volume and weight. The structure of the planetary reducer can be repeatedly connected in the required number of segments, and the multiple segments can be combined separately. It is small in size, light in weight, which makes the equipment more valuable.


3. High efficiency and low backlash

Since each group of gears of the reducer has only single tooth occlusal interface during transmission, greater tooth surface stress is required when the same torque is transmitted. Therefore, the gear design must adopt larger module and thickness. The larger the gear module, the greater the tooth surface stress. The larger the deflection tolerance value between the gears, the greater the cumulative backlash between the various reduction ratios of formed relatively higher gear gap. The unique multi-point uniform in the planetary gear combination, and the arc envelope structure of the outer gear ring, makes the outer gear ring and the planetary gear tightly integrated, and achieve high tightness between the gears, which not only improving the extremely high efficiency value of the reducer, the equipment itself can achieve high positioning selection too.


Transmission principle:

The transmission structure of the planetary reducer is the most efficient combination among  current gear reducers. Its basic transmission structure includes sun gear, planetary gear, internal gear ring and stage gear. The driving source activates the sun gear in direct or connected manner, and the sun gear drives the planetary gear combined on the planet carrier to run. The planetary gear system of the whole lease revolves around the rotation of the outer gear ring, and the planet carrier is connected to the output shaft to realize deceleration. The higher reduction ratio is accumulated by multiplying multiple sets of stage gears and planetary gears.


As professional speed reducer manufacturer, GIGAGER is specialized in producing planetary gear head reducer for more than 10 years. All of GIGAGER planetary gearboxes are designed with integral structure with large span of the front and rear bearings distributed inside the box body, forming a stable integrated structure to ensure transferring the largest torque in the most compact form.