Solid-Tire-and-Hub Assembly with Trapezoidal Cross-Section
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Solution Overview
Problem
In solid-tire-and-hub assemblies for industrial cargo applications, edge strain and center strain are inversely proportional, making it difficult to reduce edge strain without affecting center strain, which limits the durability and performance of the assembly.
Innovation Solution
A solid-tire-and-hub assembly with a trapezoidal transverse cross-section and a partially hollow hub with specific geometric features, such as arcuate side surfaces and concave facial surfaces, reduces edge strain while maintaining center strain, enhancing durability and performance without altering the size or manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the assembly size is changed to optimize strain distribution, then the manufacturing complexity increases
Solution Approach 1:
The patent employs asymmetry by transitioning from a symmetric rectangular cross-section to an asymmetric trapezoidal cross-section with specifically designed arcuate surfaces. This asymmetric geometry optimizes strain distribution by creating favorable stress flow patterns, while the regularity of the curvature radii (4.0 mm for side surfaces, 90 mm for interior facial surface) maintains manufacturability through standardized forming processes.
Data Source
AI summary
A solid-tire-and-hub assembly is provided. The assembly includes a solid tire defining a pair of opposed, spaced side surfaces and a pair of opposed, spaced facial surfaces extending between the side surfaces such that the solid tire defines a substantially trapezoidal transverse cross-section. The solid tire is disposed about a partially hollow hub, which defines a substantially “I” transverse cross-section substantially aligned with the cross-section of the solid tire, an axial aperture configured to receive a drive shaft, and a plurality of holes defined about the aperture. A power-drive unit is also provided. The unit includes a housing, a drive shaft, and at least one of the solid-tire-and-hub assembly connected to the housing.