Transmission gears often work under high speed, high load, speed and load. The gears are not only due to normal wear, but also due to poor lubricant quality, poor lubrication conditions, improper driving operation, and gear assembly during maintenance. If the position is improper, etc., the gear impact will be caused, the gear teeth will not be well combined, and the starting jitter will accelerate the wear and damage of the gear. Gears rely on their structural dimensions and material strength to withstand external loads, which requires high strength toughness and wear resistance. Due to the complex gear shape, high gear accuracy requirements, and good material manufacturability, transmission gears are commonly used. The material is forged steel.