Automotive Wheel Hub Curvature Optimization
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Solution Overview
Problem
Automotive wheels face stress concentration issues on the hub surface rounded section during rotating bending endurance tests, leading to potential deformation and reduced durability, particularly due to lateral forces applied during vehicle travel.
Innovation Solution
The design incorporates a hat section with a curved inner lower concave surrounding section and an inner convex surrounding section, where the curvature of the inner lower concave surrounding section is smaller than the hub surface rounded section, reducing the inclination angle and stress concentration on the hub surface rounded section, thereby enhancing durability and preventing contact with the brake caliper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hub surface rounded section is designed with conventional curvature, then the wheel structure is simple, but stress concentration occurs during rotating bending endurance tests leading to reduced durability
Solution Approach 1:
The patent applies curvature optimization to the hub surface rounded section by introducing a specifically designed curved surface with controlled radius of curvature. This curved surface transitions smoothly from the hub mounting section to the hat section, eliminating stress concentration points while maintaining structural integrity. The curvature design directly addresses the durability issue by redistributing stress during rotating bending endurance tests.
Solution Approach 2:
The patent implements local quality enhancement by applying different curvature characteristics to specific regions of the hub surface rounded section. The curvature radius is specifically optimized in the critical stress concentration area where the hub surface rounded section meets the hat section, while other areas maintain conventional design. This localized curvature optimization improves durability without requiring complete redesign of the entire wheel structure.
2Strength
If the hat inner inclined surrounding section protrudes to the surface side, then the wheel provides high rigidity against bending moment, but the inner convex surrounding section may contact the brake caliper
Solution Approach 1:
The patent applies parameter optimization to the hat inner inclined surrounding section by adjusting the protrusion distance and curvature radius of the inner convex surrounding section. The design specifies that the maximum protrusion distance from the hub surface rounded section should be controlled within a specific range, and the curvature radius should be optimized to maintain rigidity while preventing contact with the brake caliper. This parameter control resolves the contradiction between strength and interference prevention.
Solution Approach 2:
The patent implements preliminary anti-action by designing the hat inner inclined surrounding section with controlled protrusion characteristics before the wheel is assembled to the vehicle. The inner convex surrounding section is shaped with specific curvature and protrusion limits that prevent contact with the brake caliper in advance, eliminating the potential harmful effect before it can occur during vehicle operation.
Data Source
AI summary
An automotive wheel includes a wheel disc in which a hat section is provided outside a hub mounting section. A hat inner inclined surrounding section of the hat section includes an inner convex surrounding section protruding to a surface side in a curved shape, and an inner lower concave surrounding section continuously formed with an inner peripheral edge of the inner convex surrounding section, continuously formed with an outer peripheral edge of a hub surface rounded section, and protruding to the back side in a curved shape.