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The gearbox gear is one of the core components in a car gearbox, used to change the torque and speed of the engine to adapt to different driving conditions and speed requirements. The gearbox gears provide different speed and force outputs through different gear ratios and combinations. Here are some key information about gearbox gears:

1. Gear types: Transmission gears mainly include cylindrical gears, bevel gears, and planetary gears, each with its specific application scenarios and design characteristics.

2. Gear ratio: Gear ratio is an important parameter in the design of transmission gears, determining the speed and torque output of the vehicle in different gears. A higher gear ratio provides greater torque and lower speed, suitable for starting and climbing; A lower gear ratio provides less torque and higher speed, making it suitable for high-speed driving.

3. Manufacturing materials: Transmission gears are usually made of high-strength alloy steel or other wear-resistant materials to ensure their durability and reliability in long-term use.

4. Lubrication and cooling: The gearbox gears require appropriate lubrication and cooling to reduce wear and extend service life. Transmission oil (gear oil) is used to lubricate gears, while also helping to cool and clean gear surfaces.

5. Maintenance and replacement: The maintenance of gearbox gears includes regular checks on the quality and level of gearbox oil, as well as checking for damage or wear on the gears. If the gears are damaged or severely worn, they may need to be replaced.

6. Noise and vibration: The manufacturing accuracy and installation quality of gearbox gears directly affect the noise and vibration levels of the gearbox. High quality gears can reduce noise and vibration, providing a smoother driving experience.

The performance of gearbox gears directly affects the performance and driving experience of vehicles, therefore the quality of their design and manufacturing is crucial.