Structural characteristics of planetary gearbox motor

Yongkun Motor is an enterprise that develops and produces gear drive mechanism products, providing customers with services such as drive solution design, part mold design and manufacturing, part production, and integrated assembly. The main products include gearboxes, reduction motors, planetary reducers, etc. Among them, the planetary gearbox motor has the following structural characteristics:

Compact structure and small volume
Characteristic manifestation: The planetary gear mechanism adopts a structure in which multiple planetary gears are evenly distributed around the sun gear, which makes the power transmission path shorter and the space utilization rate extremely high.

Advantages: Under the same transmission ratio and load capacity, the volume of planetary reducer is about 30% -50% smaller than that of traditional gear reducer, which is very suitable for occasions with limited installation space, such as robot joints, aerospace equipment, etc.

Wide range of transmission ratios
Characteristic performance: By adjusting the gear combination of the sun gear, planetary gear, and inner ring gear, a wide range of transmission ratios can be achieved. The single-stage transmission ratio is usually between 2-12, and after multi-stage combination, the transmission ratio can reach thousands.

Application scenarios: It can meet the requirements of low-speed high torque (such as lifting equipment) and also adapt to high-speed low torque working conditions (such as automated production lines).

High transmission efficiency
Characteristics: In the process of planetary gear transmission, the friction between the meshing surfaces of the gears is relatively small, and multiple pairs of gears simultaneously bear the load, resulting in low energy loss. The efficiency of a typical single-stage planetary gearbox can reach 90% -97%, and the efficiency of multi-stage transmission can also be maintained at over 85%.

Meaning: Efficient transmission can reduce energy waste and lower operating costs, especially suitable for energy sensitive equipment such as new energy vehicle drive systems.

Strong carrying capacity
Characteristics: Multiple planetary gears evenly distribute the load, resulting in less force on each gear. The gears are made of high-strength materials (such as low-carbon alloy steel) and precision heat treatment processes (such as carburizing and quenching), which improve the hardness and wear resistance of the tooth surface.

Application: Able to withstand large radial and axial forces, suitable for heavy-duty conditions such as construction machinery, mining machinery, etc.

Smooth transmission and low noise
Characteristic manifestations:

The planetary gears are evenly distributed, which can balance centrifugal and inertial forces and reduce vibration.

During the process of gear meshing, the degree of coincidence is high (with multiple pairs of gears meshing simultaneously), and the transmission impact is small.

Precision machined gears and optimized structural design can reduce operating noise, typically with noise levels below 60 decibels (traditional gearbox noise is about 70-80 decibels).

Applicable scenarios: environments with strict requirements for noise and vibration, such as medical equipment, high-end machine tools, etc.

High reliability and long lifespan
Characteristic manifestations:

The structural design is reasonable, and the key components have undergone fatigue strength calculation and life testing.

Adopting a closed box lubrication system, the gears are always in good lubrication condition, reducing wear.

Under normal usage conditions, the lifespan can reach 10-20 years, with a long maintenance cycle (usually checking the lubrication status every 1-2 years).

Advantages: Suitable for equipment that requires long-term continuous operation, such as wind turbines, petrochemical equipment, etc.

Flexible installation method
Characteristic manifestations:

Multiple installation forms can be provided, such as horizontal, vertical, flange, etc., to adapt to different installation spaces and connection requirements.

The input shaft and output shaft can be selected in solid shaft, hollow shaft, spline shaft and other forms according to the working conditions, making it easy to connect with components such as motors and couplings.

Convenient application: In the layout design of automated production lines, the installation position of reducers can be flexibly adjusted to improve system integration.

The main driving structure of the planetary reduction motor is: planetary gear, sun gear, and external gear ring. Due to structural reasons, the planetary reduction motor has a single-stage reduction ratio of 3 and generally does not exceed 10. The common reduction ratio is 3.4.5.6.8.10, and the number of stages of the reduction motor generally does not exceed 3. However, some customized reducers with large reduction ratios have 4 stages of reduction. Compared to other reduction motors, planetary reduction motors have characteristics such as rigidity, accuracy (up to 1 point per stage), driving efficiency (97% -98% per stage), torque/volume ratio, and lifetime maintenance free. Due to these characteristics, planetary gear motors are mostly installed on stepper motors and motors to reduce speed, increase torque, and match inertia.