Drive Wheel Bearing Interface Layout for Compact, Corrosion-Resistant Hubs
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Solution Overview
Problem
Existing motor vehicle drive wheel assemblies face challenges in achieving axial compactness, high payload, and good camber stiffness while minimizing the risk of contact corrosion and abrasion at the interface between the inner rolling bearing ring and the wheel hub.
Innovation Solution
A motor vehicle drive wheel assembly design with a fixed subassembly and a rotating subassembly, featuring a wheel hub with a flange, a transmission bowl, and an inner rolling bearing ring positioned to minimize contact corrosion by locating the interface between the inner rolling bearing ring and the wheel hub away from the inner raceway, ensuring the end face of the bearing ring is axially opposite the dismounting direction, and maintaining uniform stress distribution through careful positioning of the contact interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inner rolling bearing ring is shrink-fitted onto the wheel hub with the bearing interface positioned in direct vicinity of the inner raceway to achieve axial compactness, then the axial size is reduced, but the contact pressure at the interface increases leading to higher risks of contact corrosion and abrasion
Solution Approach 1:
The patent positions the bearing interface in the axial dimension at a controlled distance from the inner raceway, rather than placing it directly at the raceway. This axial spacing creates a protective buffer zone that prevents metal particles from the contact interface from directly contaminating the raceway, while still maintaining compact overall dimensions. The interface is positioned at an optimal axial distance that balances compactness with protection against corrosion and abrasion.
2Volume of moving object
If the contact surface between the bearing shoulder and wheel hub is made small to achieve axial compactness, then the axial bulk is reduced, but the contact pressure increases causing greater risks of contact corrosion
Solution Approach 1:
The patent applies different functional qualities to different zones of the bearing ring. The contact face positioned away from the raceway experiences high contact pressure but is isolated from the rolling contact zone, while the raceway area maintains its rolling contact quality. This spatial separation of functions allows the contact interface to be compact without directly compromising the quality of the rolling contact surface, as the harmful effects are localized to the separated contact zone rather than affecting the raceway.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves axial compactness, high payload, and good camber stiffness while reducing the risk of contact corrosion and abrasion, thereby enhancing the assembly's durability and performance.
Implementation Method 1
the inner rolling bearing ring being shrink-fitted onto a shrink-fit surface of the wheel hub
Data Source
AI summary
A motor vehicle drive wheel assembly includes a fixed subassembly that includes two outer raceways; a rotating subassembly that includes a wheel hub, two inner raceways and two rows of rolling bodies that are arranged in two pitch planes PP1 and PP2. One of the inner raceways is formed on a rolling bearing ring bearing against a shoulder of the wheel hub along a bearing interface having an outer circumference of large diameter.