V-belt Rubber Composition with Oriented Nanofibers
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Solution Overview
Problem
Existing V-belts face challenges in achieving high flex fatigue resistance and efficient power transmission due to the trade-off between elasticity along the belt width and length, leading to issues like cracking and increased energy loss during bending.
Innovation Solution
A V-belt composition with a rubber layer containing oriented nanofibers and organic short fibers, where the nanofibers have a diameter of 300 nm to 1,000 nm and the organic short fibers have a diameter of 10 µm or larger, providing high anisotropy in storage modulus and reduced friction, enhancing elasticity and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubber composition is made more elastic along the belt width to improve flex fatigue resistance, then the belt becomes more prone to cracking and energy loss during bending
Solution Approach 1:
The patent applies local quality by creating anisotropic properties in the rubber composition through oriented nanofibers and organic short fibers. The fiber orientation creates different mechanical properties in different directions: high elasticity along the belt width (grain direction) for flex fatigue resistance, while maintaining appropriate stiffness along the belt length to reduce energy loss during bending. This directional differentiation resolves the contradiction by making the material properties location and direction-specific rather than uniform.
Solution Approach 2:
The patent uses composite materials by combining rubber base material with specifically oriented nanofibers (300-1,000 nm diameter) and organic short fibers (10 µm or larger diameter). This composite structure creates the desired anisotropic mechanical properties where the fiber orientation controls the elasticity distribution, allowing high elasticity in the grain direction while maintaining structural integrity in the cross-grain direction to prevent cracking and reduce energy loss.
2Strength
If nanofibers with smaller diameter are used to increase elasticity, then the friction coefficient increases leading to higher energy loss
Solution Approach 1:
The patent applies parameter changes by carefully controlling the nanofiber diameter within the specific range of 300-1,000 nm. This parameter optimization balances the competing requirements: nanofibers provide the necessary elasticity enhancement while keeping the friction coefficient at acceptable levels. The specific diameter range represents an optimized parameter that achieves sufficient elasticity without excessive friction, resolving the contradiction between strength enhancement and energy loss.
3Loss of energy
If organic short fibers with larger diameter are used to reduce friction, then the elasticity along the belt width decreases
Solution Approach 1:
The patent merges two different fiber types with complementary functions: nanofibers (300-1,000 nm) that provide elasticity enhancement and organic short fibers (10 µm or larger) that reduce friction. By combining these fiber types in specific proportions and orientations within the rubber composition, the patent achieves both high elasticity along the belt width and acceptable friction levels, resolving the contradiction between these two opposing requirements through synergistic combination.
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 V-belt exhibits improved flex fatigue resistance, reduced energy loss during bending, and lower friction coefficients, resulting in efficient power transmission and extended durability.
Implementation Method 1
the nanofibers and organic short fibers are dispersed
Implementation Method 2
crosslinking the formed belt
Data Source
Figure 1
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AI summary
A V-belt (B) includes a rubber composition forming a portion (11) to be V-shaped side faces (110). Organic nano fibers (16) and organic short fibers (17) are included in the rubber composition, and oriented along a belt width. In the rubber composition, a ratio of a storage modulus in a grain direction to a storage modulus in cross-grain direction is 5 or greater.