Laser-Etched Clutch Surface Patterns for Friction Material Adhesion
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Solution Overview
Problem
Current methods for laser etching metal clutch parts for adhesion of wet friction material lack an optimized crater distribution pattern, which affects the bonding adhesion efficiency, as existing laser etch patterns focus on laser input power and frequency without considering the effect on crater dimensions and distribution.
Innovation Solution
A method involving laser etching of craters in a specified area on metal clutch parts using predefined paths such as radially aligned and circumferentially overlapping figure eights, circumferentially aligned and radially overlapping figure eights, or circumferentially spaced radially extending lines, covering 30 to 70% of the surface, with craters having a maximum diameter of 65 μm to 110 μm and depth of 2 to 8 μm, to create an optimal etch pattern for friction material bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional laser etching methods are used with focus on laser input power and frequency, then the etching process can be completed, but the crater distribution pattern is not optimized leading to insufficient bonding adhesion
Solution Approach 1:
The patent applies local quality by creating craters with specific dimensional characteristics (65-110 μm diameter, 2-8 μm depth) and distributing them in optimized patterns (30-70% surface coverage) within the etching area. Different regions of the friction material bonding surface receive tailored crater treatments that enhance adhesion locally while maintaining overall structural integrity.
Solution Approach 2:
The patent changes multiple parameters simultaneously: crater diameter (65-110 μm), depth (2-8 μm), surface coverage (30-70%), and spatial distribution patterns. These parameter optimizations transform the laser etching process from a simple marking operation into a precision surface engineering tool that maximizes bonding adhesion through controlled crater morphology and arrangement.
2Reliability
If laser etching creates dense crater distribution to improve adhesion, then bonding strength increases, but the manufacturing time and energy consumption increase
Solution Approach 1:
The patent applies partial action by achieving effective bonding adhesion without requiring complete surface coverage with craters. The optimized coverage of 30-70% provides sufficient adhesion strength while leaving portions of the surface untreated, thereby reducing total laser processing time and energy consumption compared to 100% coverage approaches.
Solution Approach 2:
The patent replaces traditional mechanical surface preparation methods (such as abrasive blasting or chemical etching) with laser-based crater formation. This substitution enables precise control over crater dimensions and distribution, achieving superior adhesion with potentially reduced process complexity and cleaner manufacturing.
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 method ensures efficient and strong adhesion of friction material to the metal clutch part by creating an optimal crater distribution that enhances bonding adhesion, improving the performance of wet-type friction clutches in oil-submerged environments.
Implementation Method 1
etching, by a laser, a plurality of craters into a specified etching area of the surface of the metal clutch part
Data Source
AI summary
A method of etching a surface of a metal clutch part for bonding of friction includes etching, by a laser, a plurality of craters into a specified etching area of the surface of the metal clutch part. The specified etching area is defined by an outer circumference and an inner circumference. The craters define an etch pattern on the surface. The laser follows a predefined path during the etching to generate the etch pattern. The path is one of a plurality of radially aligned and circumferentially overlapping figure eights, each of the figure eights extending from the outer circumference of the specified etching area to the inner circumference of the specified etching area; a plurality of rows of circumferentially aligned and radially overlapping figure eights extending from the outer circumference of the specified etching area to the inner circumference of the specified etching area; or a plurality of circumferentially spaced radially extending lines extending from the outer circumference of the specified etching area to the inner circumference of the specified etching area. The method also includes bonding the friction material to the metal clutch part on the etch pattern.