Wheel Bearing Flange Rib Geometry for Brake Judder Suppression
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Solution Overview
Problem
Existing vehicle wheel bearing devices face challenges in maintaining accuracy of deflection due to variations in tightening force of wheel bolts, leading to deformation and brake judder, despite efforts to ensure rigidity.
Innovation Solution
A bearing device with a vehicle wheel mounting flange featuring double-row raceway surfaces and rolling elements, where the flange includes screw holes with ribs, and specific dimensional relationships (B/A≥1.7 and C/A≥0.8 for one configuration, and F/E≥1.7 and G/E≥0.8 for another) are defined to reduce deformation and enhance rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wheel bolts are tightened to fix the wheel and brake rotor, then the wheel and brake rotor are securely fixed, but deformation around screw holes occurs due to variations in tightening force, leading to deterioration in accuracy of deflection of the vehicle wheel mounting flange
Solution Approach 1:
The patent applies local quality by providing ribs with specific dimensional relationships (B/A≥1.7 and C/A≥0.8) around the screw holes in the vehicle wheel mounting flange. These locally reinforced areas have different structural properties than the surrounding material, creating zones that can accommodate bolt tightening forces without causing deformation that would affect the overall deflection accuracy of the mounting flange.
2Stability of the object's composition
If ribs are provided around screw holes to ensure rigidity of the bearing, then rigidity is improved, but the device weight increases
Solution Approach 1:
The patent applies parameter changes by defining specific dimensional relationships for the ribs (B/A≥1.7 and C/A≥0.8) rather than using uniform reinforcement throughout the structure. By carefully controlling the width-direction dimension B and thickness-direction dimension C relative to the screw hole nominal diameter A, the design achieves optimal rigidity enhancement while minimizing material usage and weight increase.
Data Source
AI summary
A bearing device for a vehicle wheel suppresses shaking of a vehicle wheel mounting flange by defining dimensional relationships of the various components of the vehicle wheel mounting flange. A vehicle wheel mounting flange (3b) includes a plurality of screw holes (31) into which wheel bolts are screwed, and a rib (35) provided on an inner side circumferential edge of the screw holes (31). When A represents a nominal diameter of the screw hole (31), B represents a width direction dimension of the rib (35) in a cross-section that passes through the center of the screw hole (31) and that is tangent to the pitch circle of the screw hole (31), and C represents a thickness direction dimension of the vehicle wheel mounting flange (3b) that passes through the rib (35), B/A≥1.7 and C/A≥0.8 are satisfied.