Spur Face Toothing Radii for Burr-Free Tooth Tip Formation
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Solution Overview
Problem
The assembly of spur toothings in wheel bearing arrangements is complicated by sharp-edged and burr-like transitions, leading to potential injuries and material detachment, and existing production processes often result in undesirable tooth positions and reduced force transmission.
Innovation Solution
The spur toothing design features rounding radii or shaping radii that transition tangentially into tooth flanks and profile faces, reducing sharp edges and facilitating material flow for a more pointed tooth tip, while a tool with a circumferential edge and shaping radii guides material flow to improve tooth formation and prevent tooth-on-tooth positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional machining or forming processes are used to produce spur toothings, then the teeth can be manufactured, but sharp-edged and burr-like transitions are created between the tooth profile face and tooth flanks
Solution Approach 1:
The patent applies curvature by introducing rounding radii at the transition zones between the tooth profile face and tooth flanks. This replaces the sharp-edged geometry with curved surfaces, eliminating burrs and sharp edges while maintaining manufacturability through standard forming processes. The rounded transitions are integrated into the tooth geometry itself, not added as separate features.
Solution Approach 2:
The patent modifies the geometric parameters of the tooth by introducing specific rounding radii (r1, r2, r3) at critical transition zones. These parameter changes transform the sharp-edged geometry into a curved geometry, reducing harmful factors while preserving the functional integrity of the tooth structure.
2Object-affected harmful factors
If rounding radii are introduced to reduce sharp edges, then assembly safety improves, but the tooth tip may become less pointed
Solution Approach 1:
The patent applies local quality by introducing rounding radii only at specific locations (transitions between profile face and flanks) while maintaining a small tooth tip radius (r_spit) at the tooth tip. This localized application of curvature ensures safety at transition zones without compromising the pointedness required at the tooth tip for proper engagement.
Solution Approach 2:
The patent uses different curvature radii for different locations: larger rounding radii (r1, r2, r3) at transition zones for safety, and a small radius (r_spit) at the tooth tip for sharpness. This differentiated curvature approach resolves the contradiction between safety and sharpness by applying appropriate curvature to each location based on its functional requirements.
3Manufacturing precision
If material flow is restricted in the radial direction during production, then tooth tip formation improves, but material flow resistance increases
Solution Approach 1:
The rounding radii introduced in the patent create curved flow paths that guide material flow more effectively during production. The curved geometry reduces flow separation and turbulence, allowing material to follow the contours of the tooth structure more smoothly, thereby improving tooth tip formation without excessively increasing flow resistance.
Solution Approach 2:
The rounding radii act as intermediaries that mediate between the material flow and the tooth geometry. During production, these rounded transitions provide a gradual path for material flow, reducing sudden changes in flow direction and minimizing resistance while still achieving precise tooth tip formation.
Data Source
AI summary
A spur toothing includes a plurality of radially extending teeth arranged on an end face, circumferentially adjacent to one another, and arranged to mesh with a mating toothing. Each tooth of the plurality of radially extending teeth has tooth flanks, a tooth tip, and a radially outer tooth profile face. A transition from the tooth flanks to the radially outer tooth profile face has a shaping radii. A tool for producing the spur toothing is also disclosed.