The performance requirements of automotive gears involve multiple aspects to ensure the reliability and efficiency of the gears under various working conditions. Here are some main performance requirements:

1. High strength and stiffness: Gears need to withstand large torque and impact loads, so they must have sufficient bending strength and stiffness to prevent fracture and deformation.

2. Wear resistance: Gears will experience wear during meshing, so they must have high wear resistance to extend the service life of the gears.

3. Contact fatigue strength: The tooth surface of gears needs to withstand long-term contact pressure, so it must have high contact fatigue strength to prevent tooth surface peeling and pitting.

4. Anti fatigue performance: Gears work under alternating loads, so they must have good anti fatigue performance to prevent the generation and propagation of fatigue cracks.

5. Accuracy: The manufacturing accuracy of gears directly affects their meshing performance, noise level, and transmission efficiency. High precision gears can reduce noise and improve transmission efficiency.

6. Heat treatment performance: Gears usually require heat treatment to improve their hardness and wear resistance. The heat treatment process should ensure that the gears do not undergo excessive deformation and maintain the accuracy of their size and shape.

7. Corrosion resistance: In some environments, gears may be exposed to corrosive substances, so they need to have a certain degree of corrosion resistance to prevent performance degradation caused by corrosion.

8. Anti bonding performance: Under high-speed or heavy load conditions, the tooth surface of gears may experience bonding, so measures need to be taken to improve the anti bonding performance of gears.

9. Noise and vibration control: The meshing of gears generates noise and vibration, so it is necessary to control the level of noise and vibration through design and manufacturing to improve ride comfort.

10. Cost effectiveness: The manufacturing cost of gears is also one of the factors that need to be considered in design, which requires maintaining cost competitiveness while meeting performance requirements.

The performance requirements of automotive gears are interrelated, and designers need to weigh multiple performance indicators to find the best design solution. With the advancement of materials science and manufacturing technology, the performance of automotive gears has been significantly improved, meeting the modern automotive demand for high performance and reliability.