Raw Edge V-Belt Fiber Composition for High-Load Durability
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Solution Overview
Problem
Existing raw edge V-belts lack sufficient high load durability and efficiency in transmission devices, particularly in applications with high torque and load, such as large two-wheeled vehicles.
Innovation Solution
A raw edge V-belt with a compression rubber layer made of a rubber composition containing a rubber component, fine cellulose fibers, and short fibers, where the content of short fibers is 25 parts by mass or more and 45 parts by mass or less per 100 parts by mass of the rubber component, and the volume fraction of short fibers is 12.5 vol % or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber composition containing fine cellulose fibers and short fibers is used, then the basic transmission function is provided, but high load durability is insufficient under high torque conditions
Solution Approach 1:
The patent optimizes the content ratio of short fibers to fine cellulose fibers in the rubber composition. Specifically, it sets the short fiber content to 25-45 parts by mass per 100 parts by mass of rubber component and fine cellulose fiber content to 5-20 parts by mass per 100 parts by mass of rubber component. This parameter optimization enhances the rubber composition's resistance to high load conditions while maintaining transmission efficiency.
Solution Approach 2:
The patent creates a composite rubber composition by combining rubber component, short fibers, and fine cellulose fibers in specific proportions. This composite structure leverages the reinforcing effect of short fibers for high load durability while fine cellulose fibers maintain the rubber's flexibility and transmission properties, achieving synergistic performance under high torque conditions.
2Strength
If the short fiber content is increased to improve high load durability, then strength under high load improves, but frictional resistance and energy loss increase
Solution Approach 1:
The patent precisely controls the short fiber content within 25-45 parts by mass per 100 parts by mass of rubber component and maintains fine cellulose fiber content at 5-20 parts by mass per 100 parts by mass of rubber component. This optimized parameter range provides sufficient reinforcement for high load durability while preventing excessive frictional resistance and energy loss that would occur with higher fiber contents.
Solution Approach 2:
The patent creates different functional zones within the rubber composition by distributing short fibers and fine cellulose fibers in specific proportions. The short fibers provide localized reinforcement in high-stress areas for load-bearing, while fine cellulose fibers maintain flexibility and reduce friction in contact areas, achieving local quality optimization that balances strength and energy efficiency.
Data Source
AI summary
A raw edge V-belt includes: a compression rubber layer formed on an inner side of the belt and made of a rubber composition. The rubber composition contains a rubber component, fine cellulose fibers, and short fibers. The content of the short fibers in the rubber composition is 25 parts by mass or more and 45 parts by mass or less per 100 parts by mass of the rubber component, and the volume fraction of the short fibers in the rubber composition is 12.5 vol % or more.