Segmented Wheel Hub Design for Heavy-Duty Vehicles
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Solution Overview
Problem
Existing heavy-duty vehicle wheel hubs face challenges with high weight, high manufacturing cost, limited material selection, and porosity issues due to their large, complex one-piece casting design, which compromises strength, fatigue resistance, and service life.
Innovation Solution
The wheel hub is designed as two or more discrete tubular segments joined together, eliminating the need for large, complex casting and forging, allowing for easier machining and reduced porosity, and enabling the use of high-strength materials for improved strength-to-weight ratio and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a one-piece cast wheel hub is used, then strength is improved, but weight increases and manufacturing cost increases
Solution Approach 1:
The wheel hub is divided into two or more separate castings that are joined together. Each casting can be optimized independently for strength while using less material than a solid one-piece hub, thereby reducing weight while maintaining structural integrity through the joining of multiple components.
Solution Approach 2:
The wheel hub employs composite construction by joining multiple castings together. This allows different sections to be made from materials optimized for their specific functional requirements, achieving superior strength-to-weight ratio compared to a uniform one-piece construction.
2Strength
If a one-piece cast wheel hub is used, then strength is improved, but manufacturing cost increases
Solution Approach 1:
The wheel hub is divided into two or more separate castings that are joined together. Each casting can be optimized independently for strength while using less material than a solid one-piece hub, thereby reducing weight while maintaining structural integrity through the joining of multiple components.
Solution Approach 2:
The manufacturing approach changes from casting a single large complex piece to casting multiple smaller pieces and joining them. This parameter change in the manufacturing process reduces mold complexity, core alignment requirements, and machining difficulties, thereby reducing manufacturing cost while maintaining strength.
3Stability of the object's composition
If a large one-piece casting is used, then structural integrity is improved, but porosity issues increase
Solution Approach 1:
The wheel hub is divided into two or more separate castings that are joined together. Each casting can be optimized independently for strength while using less material than a solid one-piece hub, thereby reducing weight while maintaining structural integrity through the joining of multiple components.
Solution Approach 2:
The harmful effect of porosity is extracted and eliminated by avoiding the conditions that create it. By dividing the hub into smaller castings, the casting process for each piece can be better controlled, reducing gas entrapment and shrinkage porosity that commonly occur in large one-piece castings.
4Manufacturing precision
If critical surfaces are machined on a large one-piece casting, then precision is achieved, but machining difficulty and cost increase
Solution Approach 1:
The wheel hub is divided into two or more separate castings that are joined together. Each casting can be optimized independently for strength while using less material than a solid one-piece hub, thereby reducing weight while maintaining structural integrity through the joining of multiple components.
Solution Approach 2:
The manufacturing approach changes from casting a single large complex piece to casting multiple smaller pieces and joining them. This parameter change in the manufacturing process reduces mold complexity, core alignment requirements, and machining difficulties, thereby reducing manufacturing cost while maintaining strength.
Data Source
AI summary
A wheel hub for a heavy-duty vehicle includes a first and second tubular hub segment. The first tubular hub segment has a first annular end surface. The second tubular hub segment has a second annular end surface and a radially extending flange. A continuous, circumferential joint is formed at the interface of the first annular end surface and second annular end surface.