Windmill Drive Gear Tooth Contour for Pressure Fluctuation

The tooth surface is divided into multiple regions along the tooth trace direction, with each region having a different curvature radius. Specifically, the curvature radius decreases from the maximum tooth thickness position toward the maximum force receiving position, and increases from the maximum tooth thickness position away from the maximum force receiving position. This local variation in curvature allows different parts of the tooth surface to adapt to different loading conditions, resolving the contradiction between uniform contact pressure during normal operation and contact pressure distribution under external forces.

The curvature radius of the tooth surface is varied as a parameter along the tooth trace direction. By changing the curvature radius from the maximum tooth thickness position toward and away from the maximum force receiving position, the contact pressure distribution is optimized for both normal driving conditions and external force conditions. This parameter change allows the pinion to maintain reliability during normal operation while reducing contact pressure fluctuations under external forces.