Composite Toothed Belt Materials for High-Torque Belt Life
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Solution Overview
Problem
Existing transmission belts face challenges in achieving high elastic modulus, long life, and resistance to abrasion under high temperature and mechanical stress, particularly in motor applications, failing to meet stringent specifications for increased work cycles and torque transmission.
Innovation Solution
A toothed belt comprising a body made of at least 60% elastomeric material formed from a mixture of diene monomer and nitrile groups modified with a salt of unsaturated carboxylic acid, reinforced with hybrid cords and covered with specialized fabrics and coatings, enhancing mechanical characteristics and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional elastomeric materials are used in transmission belts, then the belt can be manufactured with standard properties, but the belt fails to achieve high elastic modulus and long life under high temperature and mechanical stress
Solution Approach 1:
The patent uses a composite material system consisting of HNBR elastomeric matrix combined with芳纶 (aramid) fibers and PTFE coating. This composite structure achieves high elastic modulus through the aramid fiber reinforcement while maintaining long belt life through the chemical resistance and thermal stability of the HNBR-PTFE system, resolving the contradiction between strength and duration of action.
Solution Approach 2:
The patent modifies the elastomeric material parameters by using hydrogenated nitrile rubber (HNBR) with specific acrylonitrile content (30-45%) and combining it with aramid fibers and PTFE coating. These parameter changes enable the belt to achieve both high elastic modulus and extended service life under high temperature and mechanical stress conditions.
2Strength
If the belt is designed for high elastic modulus and maximum performance, then torque transmission capability improves, but abrasion resistance and life are reduced
Solution Approach 1:
The patent employs a composite structure with HNBR elastomeric body reinforced by aramid fibers and coated with PTFE. The aramid fibers provide high torque capacity through their high tensile strength, while the PTFE coating layer protects against abrasion and chemical degradation, simultaneously achieving high torque capacity and reliability.
Solution Approach 2:
The patent applies different material properties to different parts of the belt: the HNBR elastomeric material provides flexibility and torque transmission in the body, aramid fibers provide tensile strength and torque capacity in the cord layer, and PTFE coating provides abrasion and chemical resistance on the surface. This local differentiation of material quality resolves the contradiction between torque capacity and abrasion resistance.
3Power
If the belt operates under high temperature and mechanical stress conditions, then power transmission performance increases, but the belt life and resistance to degradation decrease
Solution Approach 1:
The patent uses a composite material system of HNBR elastomer with aramid fiber reinforcement and PTFE coating that maintains structural integrity and power transmission capability under high temperature and mechanical stress, while the PTFE coating specifically protects against thermal and chemical degradation, extending belt life.
Solution Approach 2:
The patent selects HNBR elastomeric material with specific compositional parameters (acrylonitrile content 30-45%) and combines it with aramid fibers and PTFE coating, creating a material system whose parameters are optimized for high temperature stability and stress resistance, enabling both high power transmission and extended service life.
Data Source
Figure 1~2
Figure 3
AI summary
A power transmission belt (101) comprising a body (102), a plurality of cords (103) embedded in the belt body, a back (107) and a plurality of teeth (106). The back (107) and/or the teeth (106) are covered with a cover material (108, 110) selected from the group consisting of woven fabrics and knitted fabrics. The body comprises, for at least 60% by weight of the total weight of the body, an elastomeric material formed of a mixture of one or more copolymers, obtained from a diene monomer and a monomer containing nitrile groups, modified with a salt of an unsaturated carboxylic acid.