The function of gear transmission is to change the transmission torque and direction of motion. Gear transmission: Gear transmission is the most widely used form of transmission in mechanical transmission. It has accurate transmission, high efficiency, compact structure, reliable operation, and long service life. The current indicators that gear technology can achieve are: circumferential speed v=300m/s, rotational speed n=105r/min, transmitted power P=105KW, modulus m=0.004-100mm, diameter d=1mm~152.3 mm. Features: 1. Constant instantaneous transmission ratio. The instantaneous transmission ratio of non circular gear transmission can be designed according to the required variation pattern. 2. With a wide range of transmission ratios, it can be used for deceleration or acceleration. 3. The range of speed (referring to the circumferential speed of the knuckles) and transmitted power is large, which can be used for high-speed (v>40m/s), medium speed, and low speed (v<25m/s) transmission; The power ranges from less than 1W to 105KW. 4. High transmission efficiency. A pair of high-precision involute cylindrical gears, with an efficiency of over 99%. 5. Compact structure, suitable for close range transmission. 6. High manufacturing costs. Some gears with special tooth shapes or high precision require specialized or high-precision machine tools, cutting tools, and measuring instruments, resulting in complex manufacturing processes and high costs. 7. Gears with low accuracy can cause noise, vibration, and impact during transmission, resulting in environmental pollution. 8. No overload protection effect.