What are the classifications of gearboxes according to the transmission method?

January 23, 2025

What are the classifications of gearboxes according to the transmission method?We can tell you that it can be divided into gear transmission, cycloidal transmission and harmonic transmission.

Gear transmission
- Gear transmission is the most classic transmission, and the single - stage transmission efficiency is up to 98%. In applications like Mining Excavation Gearboxes, this high - efficiency gear transmission is crucial for powering the heavy - duty digging operations.
- Simple structure, high reliability, long life (design life 20 years), large power range (up to 30kw). For instance, in Metallurgical Equipment Gearboxes, the long - lasting and reliable gear transmission can withstand the harsh working conditions in the metal - smelting process.
- Includes helical gears, worm gears, cone (umbrella) gears, and planetary gears.
  - The coaxial helical gear motor has compact structure, small size, beautiful appearance and strong overload capacity. This type of gear arrangement is often found in Gearboxes for Conveyors and separators, enabling smooth and efficient material transfer.
  - The main feature of the worm gear reducer is that it has a reverse self - locking function and can have a large reduction ratio. The input shaft and the output shaft are not on the same axis, nor on the same plane. However, the volume is generally large, the transmission efficiency is not high, and the accuracy is not high. In Concrete Mixing Gearbox, the worm gear reducer might be used to achieve the required mixing speed while dealing with the relatively lower efficiency trade - off due to other functional requirements.
The cycloidal pin wheel
- Adopts the planetary transmission principle, and the cycloidal wheel and the pin wheel meshing realize multi - tooth simultaneous meshing transmission, thereby avoiding the possibility of breaking the teeth. This principle is also relevant in some types of Mining Equipment Gearboxes where the durability and load - bearing capacity are of great importance.
- Compact structure, small size, large transmission ratio, first - class speed ratio up to 1:119, single - stage transmission average efficiency of more than 90%.
- Planetary geared motor has the advantages of compact structure, small return clearance, high precision, long service life and large rated output torque. Generally used for transmission equipment with low speed and high torque, the motor internal combustion engine or other high - speed running power is meshed with the large gear on the input shaft of the geared shaft of the geared motor to achieve the purpose of deceleration. In applications similar to Power Plant Conveying Gearboxes, the planetary geared motor can effectively slow down the high - speed power source to meet the conveyor's speed requirements.
The harmonic drive
- Generates mechanical waves from the harmonic generator, and then the relative displacement between the teeth is generated by the deformation of the flexible gear to achieve the transmission purpose.
- Advantages: Single - stage transmission ratio can reach 1:50, the number of meshing teeth is large, the bearing capacity is high, the volume is small, the quality is light, and the single - stage transmission efficiency is 1% to 90%.
- Generally used for medium and small Power transmission, the motor power is below 10kw. The harmonic drive of 4 harmonic gear motor is the elastic deformation controlled by the flexible element to transmit motion and power. It is small in volume and high in precision, but the disadvantage is that the life of the flexible wheel is limited, it is not resistant to impact, and the rigidity and metal parts are relatively poor.

The geared motor is a fixed speed geared motor. Once the speed ratio is selected, the motor is selected and the final output speed is fixed. However, there are many occasions in which the speed is required to vary in the actual use process, such as the spindle speed of the lathe, the stirring shaft speed of various agitators, and the conveyor speed when conveying different items. How to adjust speed is an important issue. Below, Boch will briefly describe various speed control methods.

Stepped speed variable pole speed regulation
- This is the simplest and most economical speed control method.
- Is limited to small and medium capacity (2kw or less) and the number of starts is not much.
- Usually only has two speeds, the speed ratio can be achieved, and the limit is three.

2, stepless speed regulation

Can be divided into mechanical and electrical.
Mechanical type is to insert mechanical stepless speed regulation device (mainly belt pulley type, friction disc type) at the joint of motor and gear box.
- The advantages are stable speed regulation, uncomplicated structure, suitable for harsh environments;
- The disadvantage is that the speed regulation range is small (generally within 1:10). The belt pulley and the friction disc are consumable parts, which need regular maintenance and replacement.
Electrical type is the cascade speed regulation of the asynchronous motor, the rotor resistance speed regulation or the voltage regulation of the DC motor.
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Ms. Davina

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