Bicycle Hub Conical Toothing for High Torque and Low Wear

The patent changes the geometric parameters of the toothing from spur (parallel) to conical (angled), which fundamentally alters the contact mechanics between toothing elements. This parameter change transforms the sliding motion into a more favorable contact pattern that reduces wear and extends maintenance intervals while maintaining torque transmission capability.

The conical toothing introduces curved surface geometry instead of flat spur tooth surfaces. The conical shape creates a point or line contact that rolls rather than slides, reducing friction and wear between mating toothing elements. This curvature principle directly addresses the wear and maintenance interval problem.

The conical toothing utilizes the axial dimension and angular orientation to achieve torque transmission, rather than relying solely on radial surface area expansion. The conical geometry allows torque transmission through the inclined surface area, enabling high torque capacity without the need for large radial flanges, thus maintaining compact assembly size.

The patent employs a composite approach by combining the conical toothing geometry with a toothed washer element. This composite structure achieves enhanced torque transmission capacity through the optimized conical contact surfaces while maintaining a compact overall size, avoiding the need for bulky radial flanges.