Modular Wheel-Hub Bearing Unit for Standardized Bearing Sizing
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Solution Overview
Problem
Wheel-hub bearing units for the Vehicle Service Market face high production costs due to the need for identical materials in both the bearing and hubs, which is not cost-effective and does not meet performance requirements for second-hand vehicles.
Innovation Solution
A modular wheel-hub bearing unit with a rolling bearing that is independent of the outer and inner hubs, where the bearing dimensions are standardized using specific design rules to ensure high performance and reliability across different applications, allowing the same bearing to be used for various applications by adjusting coefficients α, β, and δ for optimal fatigue and structural performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If identical materials are used in both the bearing and hubs to ensure high performance and reliability, then the performance standards are maintained, but the production costs increase significantly
Solution Approach 1:
The wheel-hub bearing unit is divided into separate modular components: the bearing assembly (with inner hub, outer hub, and rolling bearing) and the axle housing. This segmentation allows each component to be manufactured independently with appropriate materials and quality standards, reducing overall production costs while maintaining reliability where critical.
Solution Approach 2:
Different material qualities and specifications are applied to different components based on their functional requirements. The bearing and hubs use materials optimized for their specific load and wear conditions, rather than requiring identical high-grade materials throughout the entire assembly, thus reducing production costs while maintaining necessary performance standards.
2Productivity
If standardized bearing dimensions are used across different applications to reduce production costs, then manufacturing efficiency improves, but the fatigue and structural performance may be compromised
Solution Approach 1:
The patent establishes specific dimensional relationships (coefficients α, β, δ) that define bearing dimensions relative to hub dimensions. These parameter relationships ensure that standardized bearings maintain appropriate structural proportions and fatigue performance across different applications, allowing cost-effective standardization without compromising reliability.
3Strength
If the bearing is integrated with the hubs as a single unit to ensure structural integrity, then the structural strength is improved, but the device complexity and production costs increase
Solution Approach 1:
The bearing assembly is segmented into separable components (inner hub, outer hub, rolling bearing) that can be manufactured and assembled independently. This reduces complexity compared to a fully integrated unit while maintaining structural integrity through proper design of the bearing-hub connections and mounting features.
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
This modular design reduces production costs while maintaining high performance standards, enabling the same bearing to be used across different applications, ensuring required fatigue and structural performance without compromising on hub thickness or rolling element size.
Implementation Method 1
a rolling bearing 2 incorporated in the two hubs 11 and 12, namely a rolling bearing 2 comprising an outer ring 21 defined by the outer hub 11, an inner ring 22 defined by the inner hub 12, and a double row of rolling elements 23 arranged between the outer ring 21 and the inner ring 22 for rotation of the inner ring 22 about a central axis A
Data Source
AI summary
A modular wheel-hub bearing unit having an outer flanged hub for mounting the unit on an upright of a vehicle, provided externally with an assembly surface and internally with a mounting seat; and a bearing provided with an outer ring, two inner rings and two rows of rolling elements arranged between the outer ring and the two inner rings. The bearing being mounted inside the assembly seat independently of the outer flanged hub and having an outer diameter, the dimensions of which are related to the dimensions of an outer diameter of the assembly surface of the flanged hub by a first coefficient (α) according to the relation: D2=α*D1, where 0.80≤α≤0.95.