Toothed Belt Resistant Layer Wear Resistance
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Solution Overview
Problem
Existing toothed belt coatings fail to provide optimal resistance to wear and noise reduction across a range of operating temperatures and speeds, with previous solutions being costly and noisy due to the use of fluorinated plastomers and other anti-friction materials.
Innovation Solution
A toothed belt with a resistant layer comprising a peroxide and a second elastomeric material formed from copolymers of nitrile group-containing monomers and dienes, modified with an unsaturated carboxylic acid salt, applied over a coating fabric, which enhances wear resistance and reduces noise without the need for expensive anti-friction materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated plastomers and anti-friction materials are used in the coating fabric, then resistance to wear is improved, but noise levels increase and cost increases
Solution Approach 1:
The patent removes anti-friction materials (PTFE, molybdenum sulphide, graphite) from the coating fabric composition. By extracting these noise-generating components while maintaining the elastomeric matrix, the invention achieves wear resistance through the elastomeric material properties alone, thereby reducing noise levels without sacrificing durability
Solution Approach 2:
The invention modifies the chemical composition parameters of the coating fabric by using copolymers with specific nitrile group content (30-39%) and controlled unsaturation levels. This parameter optimization allows the elastomeric material itself to provide adequate wear resistance and damping characteristics, eliminating the need for additional anti-friction additives that generate noise
2Reliability
If fluorinated plastomers are used in the resistant layer, then resistance to wear is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive fluorinated plastomers with cost-effective elastomeric materials (nitrile copolymers) that can be readily processed and applied. The elastomeric coating provides sufficient wear resistance for the application without requiring costly fluoropolymer materials, achieving the same protective function at lower material cost
Solution Approach 2:
The invention changes the material selection parameters from fluorinated plastomers to elastomeric copolymers with specific compositional ranges (30-39% nitrile groups). This parameter shift maintains the functional requirements for wear resistance while dramatically reducing material costs through the use of more economical elastomeric compounds
3Reliability
If the coating fabric is treated with halogenated polymers or anti-friction materials, then some wear resistance is improved, but the treatment does not form a separate protective layer and wear resistance remains insufficient
Solution Approach 1:
The patent creates a composite elastomeric coating fabric where the elastomeric material itself forms the primary protective matrix. The copolymer composition (nitrile groups 30-39%) provides both structural integrity and wear-resistant properties in a unified composite material system, eliminating the need for separate anti-friction material layers
Solution Approach 2:
The invention segments the coating fabric into distinct functional layers: the elastomeric copolymer matrix providing the primary wear-resistant barrier, with optional reinforcement fibers embedded within. This segmented structure allows each component to perform its specific function optimally, with the elastomeric matrix forming a continuous protective layer without requiring additional anti-friction coatings
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 high resistance to wear and low noise levels at both high and low speeds, and across various temperatures, while being cost-effective and compatible with the fabric, without the use of expensive anti-friction materials, and maintains mechanical characteristics.
Implementation Method 1
a resistant layer comprising a peroxide and a second elastomeric material formed from copolymers of nitrile group-containing monomers and dienes
Implementation Method 2
a resistant layer comprising a peroxide and a second elastomeric material formed from copolymers of nitrile group-containing monomers and dienes, modified with an unsaturated carboxylic acid salt
Data Source
AI summary
There is described a toothed belt comprising an elastomeric material body, in which a plurality of longitudinal filiform resistant inserts is embedded, and a toothing coated by a coating fabric. A resistant layer that increases the resistance to abrasion and thus the resistance to wear of the toothed belt is adhered over the coating fabric. The resistant layer comprises a vulcanization agent and more than 75% of an elastomer formed by at least one copolymer modified with an unsaturated carboxylic acid salt and obtained from a dien monomer and a nitrile group-containing monomer. The resistant layer is advantageously separated from the fabric and is calendered on the fabric itself.