Road Simulation Drum With Cyclic Corrugations and Alloy Coating
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Solution Overview
Problem
Existing drum designs for simulating road surfaces in automobile wheel and tyre tests face challenges such as high machining difficulty and short wear-resistant life, leading to instability and reduced friction force capabilities.
Innovation Solution
A drum with cyclic corrugations composed of tangential concave and convex arcs on a carbon steel surface, combined with a 7Cr13 superhard wear-resistant alloy coating applied via electric arc spraying, to enhance friction force and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fine surface corrugations are machined on the drum surface to increase friction force, then the lateral friction coefficient increases, but the wear resistance deteriorates and the service life shortens
Solution Approach 1:
The invention changes the geometric parameters of the corrugations by using standard thread profiles (metric, inch, pipe threads) with specific pitch and depth ratios. This optimization ensures adequate friction force while preventing excessive wear, resolving the contradiction between friction enhancement and wear resistance.
Solution Approach 2:
The invention applies wear-resistant alloy coatings (such as chromium plating or ceramic coatings) on the drum surface to create a composite structure. The base drum provides structural strength while the coating layer provides wear resistance, allowing the corrugations to maintain their friction-generating function without deteriorating quickly.
2Measurement precision
If complex pattern outlines are machined on the drum surface to simulate road conditions, then the test accuracy improves, but the machining difficulty and cost increase significantly
Solution Approach 1:
The invention segments the complex road surface simulation into standardized thread patterns that can be independently defined by pitch and depth parameters. This segmentation allows different thread types to be used for different test conditions, maintaining test accuracy while simplifying the machining process through standardization.
Solution Approach 2:
The invention uses parameterized thread definitions (pitch, depth, profile type) that can be adjusted through CNC programming without changing the physical tooling or machining process complexity. This allows accurate simulation of various road conditions while maintaining ease of manufacture through software-based parameter control.
3Ease of manufacture
If the drum surface is made smooth to reduce machining complexity, then the ease of manufacture improves, but the friction force capability deteriorates
Solution Approach 1:
The invention introduces controlled surface parameters (thread pitch, depth, profile) that transform a smooth surface into a friction-enhancing structure through standardized machining operations. This resolves the contradiction by providing a systematic way to add friction capability while maintaining manufacturing simplicity through standard thread cutting processes.
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 significantly reduces machining complexity, increases friction force by 14%, and extends wear-resistant life by 3 to 4 times compared to prior art, while maintaining surface performance and stability.
Implementation Method 1
a 7Cr13 superhard wear-resistant alloy coating applied via electric arc spraying
Data Source
AI summary
The present invention provides a drum of a wheel tester, which is characterized in that an outer surface of the drum has cyclic corrugations parallel to a cross section of the drum, wherein the cyclic corrugation in one cycle on the outer surface is composed of a concave arc and a convex arc, both of which are tangential in ends and equal in diameter, and one cycle is 30 to 50 mm in length and 1 to 1.5 mm in depth. The drum is easy to machine, reduced in cost, increased in friction force and suitable for simulating various road surfaces.