Wheel Hub Coupling Coating to Prevent Micro-Slip Noise
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Solution Overview
Problem
Micro-slipping between coupled surfaces in wheel hub assemblies causes noise, particularly noticeable in electric vehicles due to reduced background noise, and existing solutions involving additional elements are costly and complex.
Innovation Solution
A wheel hub assembly with a mixed rolling bearing and a protective coating containing hard particles dispersed in an organic or inorganic matrix applied to metal surfaces to prevent micro-slipping, ensuring stable coupling under external stresses without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional elements are added to prevent micro-slipping, then coupling stability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The coating is applied in advance to the metal surfaces before assembly, creating a protective layer that prevents micro-slipping during operation. This preliminary action eliminates the need for additional complex elements during the coupling process
Solution Approach 2:
The coating acts as an intermediary layer between the two metal surfaces, mediating the interaction to prevent direct metal-to-metal micro-slipping while maintaining the simplicity of the direct coupling design
2Reliability
If additional elements are added to prevent micro-slipping, then coupling stability is improved, but manufacturing cost increases
Solution Approach 1:
The coating is applied during the manufacturing process as a preliminary step, integrating the protective function into the base component production rather than requiring separate additional parts, thereby controlling manufacturing costs
Solution Approach 2:
The solution changes the surface parameters of the existing metal surfaces through coating, rather than adding new components. This parameter modification approach maintains cost-effectiveness by working with the existing structure
3Object-generated harmful factors
If micro-slipping is prevented through conventional means, then noise is reduced, but assembly complexity increases
Solution Approach 1:
The anti-micro-slipping coating is applied in advance to the surfaces, preventing noise-generating micro-slipping during operation without requiring complex assembly structures or additional noise-reduction components
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 solution effectively reduces noise and stabilizes couplings, extending component life and simplifying assembly, while being cost-effective and suitable for electric vehicles.
Implementation Method 1
a protective layer or coating, which may be formed by an organic matrix, for example a synthetic polymer or a mixture of synthetic polymers. In the case of the first and third metal surfaces, the coating may also be alternatively made of an inorganic matrix, such as a metal matrix, in which hard particles are uniformly dispersed. The hard particles may have a Mohs hardness equal to or greater than 9 and dimensions of between 15 μm and 60 μm
Data Source
AI summary
A wheel hub assembly includes a wheel hub unit having a radially outer ring with a first metal surface, a radially inner ring with a third metal surface, and a plurality of rolling bodies interposed between the inner ring and the outer ring. The hub assembly includes a suspension pillar with a second metal surface butt coupled to the first metal surface of the radially outer ring, and a constant velocity joint having a fourth metal surface butt coupled to the third metal surface of the radially inner ring. A coating having a plurality of hard particles and made of an organic matrix or an inorganic matrix covers at least one of the first metal surface and the third metal surface.