Binder-Reduced Brake Friction Linings Without Hardening
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Solution Overview
Problem
Existing friction linings for motor vehicle brakes contain significant amounts of binders that lead to reduced braking performance during the break-in phase due to unhardened binder shares, and existing binder-free solutions are either costly or lack mechanical stability.
Innovation Solution
A friction lining composition with a maximum binder content of 2.5% by weight, primarily composed of metal fibers (30-65% by weight), expanded graphite (5-26% by weight), and optionally expanded vermiculite, produced without the hardening and scorching processes, ensuring mechanical stability and cohesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binder-free friction lining is used, then braking performance is improved and green fading is eliminated, but mechanical stability and cohesion deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of metal fibers (30-65% by weight), graphite (5-26% by weight), and optional expanded vermiculite to create a binder-free friction lining that maintains both mechanical stability and braking performance. The synergistic combination of these materials provides structural integrity without requiring organic binders.
Solution Approach 2:
The patent specifies precise parameter ranges for each component: metal fiber content of 30-65% by weight, graphite content of 5-26% by weight, and metal fiber length of 0.5-5 mm. These controlled parameters ensure the friction lining achieves adequate mechanical stability while maintaining binder-free composition.
2Stability of the object's composition
If traditional hardening and scorching processes are used, then binder hardening is achieved, but production complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the binder component from the friction lining composition entirely. By removing the binder, the complex hardening and scorching processes become unnecessary, significantly simplifying the production process while maintaining friction lining integrity through the metal fiber-graphite composite structure.
Solution Approach 2:
The metal fiber-graphite composite structure provides self-stabilization without requiring external hardening processes. The friction lining achieves its functional properties directly from the material composition and pressing process, making the system self-sufficient and eliminating the need for additional hardening equipment and process steps.
3Reliability
If binder content is reduced to maximum 2.5% by weight, then green fading is minimized, but mechanical cohesion may be compromised
Solution Approach 1:
The patent employs a composite material system where metal fibers (30-65% by weight) provide structural framework and graphite (5-26% by weight) provides binding and lubrication properties. This composite structure achieves mechanical cohesion equivalent to or exceeding traditional binder-based systems while limiting binder content to maximum 2.5% by weight, thereby minimizing green fading.
Solution Approach 2:
The patent creates local quality differentiation within the friction lining by using metal fibers for structural integrity and graphite for binding and friction properties. This functional differentiation allows the system to achieve both mechanical cohesion and reduced binder content, resolving the contradiction between green fading prevention and mechanical stability.
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 provides high-quality, cost-effective friction linings with improved mechanical stability and braking performance, eliminating the need for hardening and scorching processes, and reducing brake dust and noise.
Implementation Method 1
friction linings for disc brakes... produced without the hardening and scorching processes, ensuring mechanical stability and cohesion
Implementation Method 2
contains no binder or a significantly reduced share of binder(s) compared to the prior art... expanded graphite (5-26% by weight), and optionally expanded vermiculite
Data Source
AI summary
Expanded graphite and/or vermiculite are introduced into the friction lining mixture to eliminate or substantially reduce the amount of binder present therein. The friction lining at most contains from 2.5% by weight of binder. By omitting/reducing binder, the production is very stable and the friction linings can be easily reproduced. The process steps of hardening (including the hardening furnace) and scorching (including the necessary equipment) can be omitted when making such friction linings.