According to different working conditions, gear transmission can be divided into closed type and open type; According to different use conditions, gear transmission can be divided into high-speed, low-speed, light load and heavy load; According to the material properties of gear teeth, gear teeth can be divided into soft tooth surface, hard tooth surface or brittle and tough.
| Industrial gear | Special gear | Cylindrical gear box; |
| Industrial gear | Special gear | Cylindrical bevel gear box; |
| Industrial gear | Special gear | Planetary gear box; |
| Industrial gear | Special gear | Worm gearbox; |
| Industrial gear | Special gear | Cycloidal pin wheel reducer; |
| Industrial gear | Special gear | Harmonic drive reducer; |
| Industrial gear | Special gear | Continuously variable transmission; |
| Industrial gear | Universal gear | High speed gear; |
| Industrial gear | Universal gear | Marine gear; |
| Industrial gear | Universal gear | Locomotive transmission gear; |
| Industrial gear | Universal gear | Special gear for petrochemical industry; |
| Industrial gear | Universal gear | Special gears for metallurgical machinery; |
| Industrial gear | Universal gear | Mining machinery gear; |
| Industrial gear | Universal gear | Building materials mill gear; |
| Industrial gear | Universal gear | Gear of light industry textile printing machinery; |
| Industrial gear | Universal gear | Machine tool gear; |
| Industrial gear | Universal gear | Gear of wind power generation equipment; |
| Industrial gear | Universal gear | Aerospace equipment gears; |
| Vehicle gear | Vehicle gear | Automobile gear, automobile gearbox assembly and axle transmission system; |
| Vehicle gear | Vehicle gear | Motorcycle gears, transmission components and parts; |
| Vehicle gear | Vehicle gear | Gears of agricultural transport vehicles, tractors and harvesters; |
| Vehicle gear | Vehicle gear | Transmission system, diesel engine gears and other agricultural machinery gears; |
| Vehicle gear | Vehicle gear | Construction machinery gear and its gear transmission system; |
Gears can be divided into the following categories according to their use occasions, as shown in the table.