Laser-Textured Friction Surface for Steering Gear Anti-Slip Mounting
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Solution Overview
Problem
Rack-based electric power steering systems face issues with the steering gear slipping relative to its mounting surface due to extreme loading during off-road or extreme maneuvers, as the smooth surface of the mounting bushing cannot withstand the clamp load.
Innovation Solution
A friction surface is created by texturing one or both interface surfaces of the components involved using laser texturing, with the harder material being textured to increase the coefficient of friction and prevent slippage, allowing the components to securely interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth surface is used for the mounting bushing, then the manufacturing is simple and the surface is easy to produce, but the steering gear slips relative to the frame under extreme loading conditions
Solution Approach 1:
The surface parameters are changed by texturing the mounting bushing surface to create a friction surface with increased coefficient of friction. This texturing modifies the surface geometry to enhance grip and prevent slippage under extreme loading conditions while maintaining manufacturing feasibility through laser texturing processes
Solution Approach 2:
The smooth mechanical surface is replaced with a laser-textured friction surface that uses controlled surface geometry to enhance friction. The laser texturing process substitutes traditional mechanical surface finishing methods with a more precise and effective laser-based approach to create the desired friction characteristics
2Reliability
If the clamp load is increased to prevent slippage, then the anti-slip performance improves, but the mounting components may fail under extreme loading
Solution Approach 1:
Instead of increasing clamp load, the friction coefficient is changed by texturing the surface. This parameter change allows the same clamp load to produce higher friction forces, preventing slippage without requiring additional clamping force that would stress the mounting components beyond their design limits
Solution Approach 2:
The friction surface is pre-textured during manufacturing to establish optimal friction characteristics before the component is subjected to extreme loading. This preliminary surface preparation ensures that the mounting interface is ready to handle extreme loads without slippage, preventing the need for excessive clamp loads that could cause component failure
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 textured friction surface significantly reduces slippage between the steering gear and the frame, ensuring stable operation under extreme conditions by enhancing the friction coefficient and maintaining the assembly's integrity.
Implementation Method 1
Both interface surfaces or only one interface surface are texturingly processed by laser beams to form a friction surface
Data Source
AI summary
A friction assembly for mounted components includes a first component having a first interface surface. The friction assembly also includes a second component having a second interface surface, wherein the first interface surface and the second interface surface are in contact in an assembled condition. One of the first interface surface and the second interface surface are textured to form a friction surface.