In ball mill drive systems, the design of the large gear significantly impacts the equipment's stability, efficiency, and lifespan. Common types of large gears include spur gears and helical gears, each with its own advantages and disadvantages, requiring selection based on actual operating conditions.

Spur gears have a simple structure, low manufacturing cost, and are easy to install and maintain, making them suitable for low-speed, heavy-load applications. However, because their tooth contact lines are parallel to the axis, they experience greater impact during meshing, resulting in higher operating noise and concentrated instantaneous loads, which can easily cause tooth surface wear or fatigue damage. Therefore, in large ball mills, if the rotational speed is high or strict requirements for smooth operation are needed, spur gears may not be the optimal choice.

In contrast, helical gears have a spiral tooth surface, resulting in a gradual meshing process where multiple teeth participate in the transmission simultaneously. This provides greater load capacity, smoother operation, and lower noise. Furthermore, helical gears effectively distribute the load, extending the gear's service life, making them particularly suitable for large, high-speed ball mills. However, their drawbacks include complex manufacturing processes, higher costs, and the generation of axial forces, requiring the use of thrust bearings to balance the forces.

In summary, if the ball mill has high power, high rotational speed, and requires high operational stability and long lifespan, helical gears offer greater advantages; if the budget is limited and the operating conditions are relatively simple, spur gears can meet basic needs. Therefore, there is no absolute answer to "which is better," the key is to match the gear type to the specific application. In modern large ball mills, helical gears are gradually becoming the mainstream choice due to their superior performance.