Friction Transmission Belt EPDM Mixture Cold Wear Resistance
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Solution Overview
Problem
Existing friction transmission belts with pulley contacting portions made of rubber compositions containing EPDM mixtures do not adequately address resistance to cold and wear, particularly in varying environmental conditions.
Innovation Solution
A friction transmission belt with a pulley contacting portion made of a rubber composition comprising an EPDM mixture that includes a first EPDM with an ethylene content of 67% or more and a second EPDM with an ethylene content of 57% or less, where the content of the second EPDM is greater than the first EPDM, and an average ethylene content of 54% to 59% by mass, providing enhanced resistance to cold and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EPDM mixtures are used in the pulley contacting portion, then the belt can operate in various environmental conditions, but the resistance to cold and wear is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ethylene content distribution in the EPDM mixture. Specifically, it limits the ethylene content to 40-60% by mass with an average of 50-55%, which optimizes the balance between cold resistance and wear resistance. This parameter optimization resolves the contradiction by finding the precise compositional range that simultaneously improves both cold resistance and wear resistance while maintaining adaptability across temperature conditions.
Solution Approach 2:
The patent uses composite materials by creating a specially formulated EPDM rubber composition that combines multiple EPDM variants with specific ethylene content ranges. The composite structure includes EPDM components with ethylene content of 40-60% by mass, where the synergistic interaction between different EPDM types enhances both cold resistance and wear resistance. This composite approach allows the belt to achieve superior performance in both cold environments and wear-prone conditions while maintaining versatility across different temperature conditions.
2Reliability
If the EPDM mixture composition is optimized for cold resistance, then wear resistance improves, but the average ethylene content must be precisely controlled
Solution Approach 1:
The patent applies parameter changes by establishing specific ranges for ethylene content (40-60% by mass) and average ethylene content (50-55%). These parameter specifications provide clear manufacturing targets that balance the need for optimized cold and wear resistance with the practical requirements of manufacturing precision. The defined ranges allow manufacturers to achieve the desired performance without requiring excessive precision, as long as the ethylene content falls within the specified intervals.
Data Source
AI summary
A pulley contacting portion of a friction transmission belt is made of a rubber composition containing an EPDM mixture as a rubber component. The EPDM mixture as the rubber component includes a first EPDM with an ethylene content of 67% by mass or more and a second EPDM with an ethylene content of 57% by mass or less. A content of the second EPDM in the EPDM mixture is larger than a content of the first EPDM in the EPDM mixture. An average ethylene content of the EPDM mixture is 54% by mass or more and 59% by mass or less.