When designing gears for new energy vehicles, multiple key factors need to be considered to ensure efficient, reliable, and long-lasting operation of the gears. Here are some main design considerations:

1. Load and stress analysis: Gear design must be able to withstand the maximum load and stress in the transmission system. This includes static and dynamic loads, as well as impact loads caused by acceleration, deceleration, and emergency braking.

2. Material selection: Choosing the appropriate material is crucial for the performance of gears. Common materials include high-strength alloy steel, carburizing steel, and powder metallurgy materials. The material should have good wear resistance, fatigue resistance, and toughness.

3. Geometric parameters of gears: The geometric parameters of gears such as module, number of teeth, pressure angle, helix angle, etc. need to be accurately designed to ensure correct meshing and efficient transmission of gears.

4. Lubrication and cooling: An effective lubrication and cooling system can reduce gear wear and thermal deformation, extending the service life of gears. When designing, it is necessary to consider the type of lubricating oil, lubrication method, and layout of cooling channels.

5. Noise and vibration control: Gear design should minimize noise and vibration as much as possible to improve ride comfort. This can be achieved by optimizing the geometric parameters of gears, using helical gears or herringbone gears, and other methods.

6. Lightweight design: Reducing the weight of gears can lower the overall weight of the vehicle and improve energy efficiency. The use of high-strength materials and optimized design are effective ways to achieve lightweighting.

7. Manufacturing process: The manufacturing process of gears, such as heat treatment, surface treatment (such as carburizing, nitriding), and precision machining, has a significant impact on the performance and service life of gears.

8. Integrated design: With the development of new energy vehicle technology, the integrated design of gears, motors, and controllers has become a trend. Integrated design can improve the overall performance and reliability of the system.

9. Environmental Protection and Sustainability: Consider environmental factors in material selection and production processes, use recyclable materials, and reduce energy consumption and emissions during the production process.

10. Cost effectiveness: Optimize the design to reduce costs and improve the market competitiveness of the product while meeting performance requirements.

By considering the above factors comprehensively, high-performance and high reliability new energy vehicle gears can be designed to provide strong support for the efficient operation of electric vehicles.