Wheel Bearing Assembly with Segmented Brake Disc
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Solution Overview
Problem
Conventional wheel bearing assemblies with brake discs made of grey cast iron are heavy, leading to reduced fuel efficiency, poor wear resistance, and corrosion issues, which can cause the brake disc to stick to the rotating element, necessitating replacement of the entire assembly and resulting in noise during operation.
Innovation Solution
A wheel bearing assembly with a steel wheel hub and a grey cast iron brake disc featuring fastening protrusion portions that are axially overlapped and radially spaced, allowing for improved heat dissipation and reduced weight through the use of ribs and air passages, and a polishing process to enhance sliding surfaces, facilitating easier assembly and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the brake disc is made as a monolithic piece by grey cast iron to ensure strength, then the brake disc can be manufactured simply, but the weight increases significantly and fuel efficiency decreases
Solution Approach 1:
The brake disc is divided into multiple segments or sections rather than being a monolithic piece. This segmentation allows for weight reduction while maintaining structural integrity through the distributed design, directly addressing the contradiction between manufacturing simplicity and weight reduction.
Solution Approach 2:
Different regions of the brake disc are given different properties or thicknesses. Areas requiring strength are reinforced locally, while other areas are thinned to reduce weight. This local differentiation resolves the contradiction by providing strength only where necessary rather than uniformly throughout the entire disc.
2Ease of manufacture
If grey cast iron is used for the brake disc to simplify manufacturing, then manufacturing cost is reduced, but wear resistance and corrosion resistance deteriorate
Solution Approach 1:
The brake disc employs composite material construction, combining grey cast iron with other materials or treatments that enhance wear and corrosion resistance. This composite approach maintains the manufacturing advantages of cast iron while compensating for its deficiencies in durability through material combination.
Solution Approach 2:
The material parameters of the brake disc are modified or enhanced through surface treatments, coatings, or alloying adjustments. These parameter changes improve wear and corrosion resistance without fundamentally altering the base material or manufacturing process, thus maintaining cost-effectiveness while improving reliability.
3Strength
If the brake disc is made heavier to compensate for poor material properties, then strength is improved, but the overall weight of the wheel bearing assembly increases
Solution Approach 1:
The brake disc structure is segmented to distribute loads more efficiently, allowing for weight reduction while maintaining strength. The segmentation creates a design where material is placed strategically to provide strength only where mechanically necessary, reducing overall weight without compromising strength.
Solution Approach 2:
The brake disc design transitions from a two-dimensional flat structure to a three-dimensional form with varying thickness, ribs, and contours. This dimensional change allows for optimized material distribution that provides strength in critical areas while minimizing weight in non-critical areas.
4Ease of manufacture
If corrosion resistance is poor, then manufacturing cost is reduced, but the brake disc gets stuck to the rotating element over time
Solution Approach 1:
Surface parameters of the brake disc are modified through coatings, treatments, or material adjustments that specifically improve corrosion resistance at the mounting interface. These parameter changes prevent sticking and facilitate easy assembly and disassembly without significantly increasing manufacturing cost.
Solution Approach 2:
An intermediary layer or coating is introduced between the brake disc and the rotating element to prevent direct metal-to-metal contact and corrosion. This intermediary protects against sticking and facilitates easy separation while maintaining the cost-effective base material design.
Data Source
AI summary
Disclosed is a wheel bearing assembly comprising a wheel hub fastened to a vehicle wheel so as to rotate as a unit and having a plurality of fastening protrusion portions, and a brake disc having a plurality of fastening protrusion portions respectively fastened to the plurality of fastening protrusion portions of the wheel hub. Thus, the wheel bearing assembly may facilitate weight reduction and improvement in ease of assembly, and enhance run-out properties of sliding surfaces of the brake disc.