Among the reducer family, planetary gear reducers are widely used in servo, stepper, DC and other transmission systems due to their small size, high transmission efficiency, wide reduction range, and high precision. Its function is to reduce speed, increase torque, decrease load, and reduce the inertia ratio of the motor while ensuring precision transmission.

The transmission principle of planetary gear reducer

The basic transmission structure of a planetary gear reducer is divided into four parts:

① Sun gear: located at the center of the planetary gear system, connected to the output shaft of the electric motor.

② Planetary gears: They rotate around the sun gear and typically have multiple planetary gears to ensure even load distribution.

③ Planetary carrier: supporting planetary gears, usually connected to the output shaft.

④ Outer ring gear: The planetary gear meshes with the outer ring gear to transmit power to the output shaft.

The drive source starts the sun gear in a direct connection, and the sun gear is combined with the planetary gears on the planetary gear carrier to drive the operation. The entire planetary gear system automatically rotates along the outer ring gear, and the planetary carrier is connected to the output shaft to achieve the purpose of deceleration. A higher reduction ratio requires multiple sets of stage gears and planetary gears to be multiplied and accumulated.

The deceleration characteristics of planetary gear reducers

A high torque, strong load:

Compared with traditional parallel gear transmission, planetary gear reducers have the advantages of high torque and strong load. Traditional gears rely only on a very small number of contact surfaces between two gears for squeezing and driving, and all loads are concentrated on a very small number of gear contact surfaces, which can easily cause friction and fracture between gears. The planetary gear reducer has multiple larger areas and 360 degree uniform loads on the gear contact surface. The multiple gear surfaces jointly and uniformly bear the instantaneous impact load, making it more capable of withstanding higher torque forces. The body and various bearing parts will not be damaged or broken due to high loads.

B has a compact structure and a small volume:

Compared with traditional gear reducers, planetary gear reducers have the advantages of compact structure and smaller volume; The reduction ratio of traditional gear reducers needs to be generated by several times the value of two gears, and there is a certain distance between the large and small gears for meshing, so the space for accommodating the gearbox is extremely large! To achieve a high reduction ratio, it is necessary to connect and combine two or more reduction gearboxes, resulting in an extremely large volume and weight. The structure of planetary gear reducers can be repeatedly connected according to the required number of segments, and multiple segments can be combined separately. The structure is compact, small in size, light in weight, and lightweight in appearance, making the application scenarios more diverse.

High efficiency and low noise:

Compared with traditional gear reducers, planetary gear reducers have the advantages of high efficiency and low noise; The unique multi-point uniform fit in the planetary gear combination, coupled with the circular arc envelope structure of the outer ring gear, ensures a tight fit between the outer ring gear and the planetary gear, resulting in a high degree of gear fit. In addition to improving the efficiency of the gearbox, the design itself can achieve high-precision positioning. In addition, by simultaneously meshing multiple planetary gears with the outer ring gear, the planetary gearbox reduces the load on a single gear, thereby reducing noise.