Annular Gear Tooth Chamfer Geometry to Reduce Pinion Wear
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Solution Overview
Problem
Conventional gear teeth of annular gears with chamfered surfaces and angular edges cause wear damage to pinion teeth during meshing and rotation.
Innovation Solution
The design incorporates a chamfered surface with an arc surface adjacent to the side flank surface and an angular edge at the boundary with the top land surface, with specific dimensions for the arc radius and length between the point of tangency and the outside line, to minimize damage during meshing with a pinion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chamfered surfaces with angular edges are used on gear teeth, then the gear structure is simple and easy to manufacture, but wear damage occurs on pinion teeth during meshing and rotation
Solution Approach 1:
The patent replaces the conventional angular edge with a curved transition surface having a specific radius of curvature. This curved surface eliminates the sharp angular edge that causes impact and wear on pinion teeth, while maintaining manufacturability through standard machining operations. The curvature radius is specifically designed to be within a certain range to optimize both protective function and manufacturing ease.
Solution Approach 2:
The patent modifies the geometric parameters of the chamfered surface by introducing a curved transition with controlled radius of curvature. This parameter change transforms the sharp angular edge into a gradual curve, reducing impact forces and wear on pinion teeth during meshing, while keeping the overall gear structure and manufacturing process relatively simple.
2Object-affected harmful factors
If an arc surface is added to the chamfered surface, then damage to pinion teeth is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent controls the radius of curvature of the arc surface within a specific range, allowing it to be machined using standard machining operations without requiring complex specialized processes. This parameter control ensures the arc surface can be manufactured with conventional equipment, balancing the need for wear protection with manufacturing ease.
Solution Approach 2:
The arc surface is applied locally only at the critical transition zone where the chamfered surface meets the tooth flank, rather than throughout the entire gear tooth. This localized application reduces the overall manufacturing complexity while providing wear protection exactly where it is most needed - at the point of contact with the pinion.
Data Source
AI summary
A bearing including a bearing ring having an annular base and a plurality of gear teeth integrally formed with the annular base. Each gear tooth of the plurality of gear teeth includes a first flank surface extending substantially radially from the annular base, a top land surface extending substantially in the axial direction, and a chamfered surface between the top land surface and first flank surface. The chamfered surface includes a first arc with a first radius in a range of 0.1 to 0.15 times the gear module of the bearing ring. The first arc has a point of tangency with the first flank surface. The chamfered surface has length P extending in the radial direction between the point of tangency and the top land surface, and P is in the range of 0.1 to 0.15 times the gear module of the bearing ring.