Disc Brake Friction Material Composition Without Harmful Components
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Solution Overview
Problem
Existing friction materials for disc brake pads contain harmful components, such as asbestos, lead, zinc, and graphite, which are not completely eliminated by current anti-pollution regulations and compromise efficiency and durability.
Innovation Solution
A compound composed of diamagnetic materials, rock wool, phenolic resins, iron fibers, and metallic flakes, combined with a specific mixing and coupling process using beveled propellers and controlled temperature, to create a friction element free of harmful substances while maintaining high efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional friction materials containing asbestos, lead, zinc, and graphite are used, then high friction efficiency and durability are achieved, but harmful substances are released compromising public health and environmental safety
Solution Approach 1:
The patent changes the chemical composition parameters by completely eliminating harmful substances (asbestos, lead, zinc, graphite) and replacing them with safe alternatives. The new compound uses diamagnetic materials, rock wool, phenolic resins, iron fibers, and metallic flakes in specific proportions to achieve both safety and performance requirements simultaneously
Solution Approach 2:
The patent creates a composite friction material compound combining multiple safe components: diamagnetic materials (10-30%), rock wool (20-40%), phenolic resins (20-40%), iron fibers (5-20%), and metallic flakes (5-20%). This composite structure achieves both harmlessness and high braking efficiency through synergistic effects of the components
2Temperature
If sintered compounds with high pressure and temperature processing are used, then thermal stability and friction efficiency are improved, but harmful gaseous substances are generated during production
Solution Approach 1:
The patent extracts and eliminates the harmful elements (asbestos, lead, zinc, graphite) from the friction material composition entirely. By removing these problematic components, the sintering process no longer generates harmful gaseous emissions while maintaining thermal stability through alternative materials like rock wool and phenolic resins that are inherently safer
3Ease of manufacture
If organic compounds with binder resins and nitrile glue are used, then ease of manufacture is improved, but harmful substances and reduced high-temperature resistance are resulted
Solution Approach 1:
The patent replaces expensive, harmful nitrile glue with phenolic resins that can be directly integrated into the sintering process. This substitution simplifies manufacturing by eliminating separate gluing steps while simultaneously improving high-temperature resistance, as phenolic resins maintain structural integrity at elevated temperatures unlike organic adhesives
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 achieves a friction element with improved thermal conductivity, reduced noise, enhanced resistance to high temperatures, and prolonged lifespan, while eliminating harmful substances, meeting regulatory requirements.
Implementation Method 1
il propriétés diamagnétiques, capable de prévenir la formation de courants induits sur le disque de frein en interrompant le flux magnétique
Implementation Method 2
des résines phénoliques, capable de réaliser une fonction de liant entre plusieurs composants du composé et de donner au composé des propriétés ignifuges
Implementation Method 3
des fibres de fer, capable de donner au composé une grande conductibilité thermique
Implementation Method 4
de la laine de roche, capable de stabiliser le coefficient de friction et dotée d'une structure macroscopique langoureuse qui lui donne à la fois des propriétés absorbantes
Implementation Method 5
During braking, the brake pads are violently compressed against the discs, dissipating the vehicle's kinetic energy in the form of frictional heat
Data Source
Figure 1
AI summary
Processes are described for producing a mixture of friction material suitable to be coupled to at least one support element of at least one friction element of at least one disc brake; the compound is free of harmful components, and is composed, in percentage by weight: from 5% to 10% of at least one diamagnetic material; from 4% to 12% of a rock wool; from 17% to 25% of a plurality of phenolic resins; from 17% to 25% of at least one iron fiber; a plurality of metallic materials; and from 2% to 8% of liquid rubber.