Double-Cogged V-Belt Rubber Composition for Shear Durability
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Solution Overview
Problem
Power transmission belts with cellulose-based fine fibers face challenges in achieving optimal durability due to limitations in the elastic modulus and fiber distribution within the rubber composition, leading to inadequate resistance against shear loads and lateral pressure.
Innovation Solution
A double-cogged V-belt design incorporating a rubber composition with cellulose-based fine fibers and carbon black, where the adhesive rubber layer has a higher storage normal modulus in the grain direction and a lower modulus in the cross-grain direction, enhancing durability through a specific arrangement of the uncrosslinked rubber sheet before crosslinking and the use of cellulose-based fine fibers and carbon black.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastic modulus is increased to improve durability, then resistance to lateral pressure is improved, but flexibility and power transmission performance deteriorate
Solution Approach 1:
The patent optimizes the specific parameters of reinforcement materials: cellulose fiber diameter (1-10 μm) and length (100-1000 μm), carbon black particle size, and their respective contents in the rubber composition. By carefully controlling these parameters, the patent achieves an elastic modulus that provides sufficient lateral pressure resistance while maintaining the flexibility needed for effective power transmission, thus resolving the contradiction between durability and operational performance.
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A power transmission belt (B) includes a belt body (10) made of rubber and a cord (12) embedded in the belt body (10). The belt body (10) has a portion (11) having the cord (12) embedded therein, and the portion (11) is made of a rubber composition having a storage normal modulus at 25°C in a grain direction of 80 MPa or more and the ratio of the storage normal modulus at 25°C in the grain direction to a storage normal modulus at 25°C in a cross-grain direction of 1.20 or more to 2.50 or less. The rubber composition is arranged such that the grain direction corresponds to a belt length direction and the cross-grain direction corresponds to a belt width direction.