Vehicle Wheel Isolator Drain Channels for Galvanic Corrosion
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Solution Overview
Problem
The use of dissimilar metals in vehicle wheel/hub arrangements can lead to galvanic corrosion in the presence of water, which existing technologies have not effectively addressed.
Innovation Solution
An isolator is placed between the brake rotor and the wheel, featuring a disk-shaped annular design with radially-oriented drain channels and surface portions that facilitate water drainage, preventing accumulation and reducing corrosion risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dissimilar metals are used in wheel/hub arrangements, then material strength and durability are improved, but galvanic corrosion occurs in the presence of water
Solution Approach 1:
The isolator serves as an intermediary component positioned between the brake rotor and wheel, featuring radially-oriented drain channels and surface portions that actively channel water away from the metal interface. This mediator prevents direct water contact between dissimilar metals, eliminating the galvanic corrosion pathway while allowing the dissimilar metal arrangement to maintain its strength benefits
2Reliability
If water drainage features are added to the isolator, then corrosion protection is improved, but device complexity increases
Solution Approach 1:
The isolator surface is segmented into multiple functional zones: radially-oriented drain channels for active water removal, and drain surface portions positioned between the channels. This segmentation creates an effective drainage network that protects against corrosion while maintaining manufacturing simplicity through the use of basic geometric features
Solution Approach 2:
The drain channels and surface portions are strategically positioned at specific locations where water accumulation is most problematic. The local quality of the surface varies - some areas have drainage features while others remain smooth - optimizing corrosion protection exactly where needed without adding complexity throughout the entire component
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 isolator effectively drains water from the interface of dissimilar metal components, reducing the risk of galvanic corrosion and ensuring the longevity of the wheel and brake rotor.
Implementation Method 1
Each of the drain channels is recessed in the first face portion, traverses between the inner ring and the outer ring, and defines a first radial line. A drainage curve is formed between the first and second points... Each point of the drainage curve being above the second point in the radial direction when the second radial line is disposed in a vertical orientation
Data Source
AI summary
An isolator for a wheel hub between a brake rotor and a wheel is described, and includes a disk-shaped annular device including an inner ring, an outer ring, a first face portion, a second face portion, a plurality of apertures, a plurality of drain surface portions, and a plurality of radially-oriented drain channels disposed on the first face portion. Each drain channel is recessed in the first face portion. Each drain surface portion is recessed in the first face portion and is fluidly coupled to one of the drain channels. Each of the drain surface portions includes a continuous surface that is recessed from the first face portion between a drainage curve, a respective drain channel, and an arc that is defined on the inner ring between a first point and the respective drain channel.