V-Ribbed Belt Rubber Composition for Core Wire Position Stability
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Solution Overview
Problem
Existing V-ribbed belts face issues with core wire position stability in the belt thickness direction, leading to reduced durability and increased manufacturing costs, due to the lack of consideration for core wire arrangement in this direction and the inclusion of low-modulus fibers which affect transmission capacity.
Innovation Solution
A V-ribbed belt design featuring a tension rubber layer made of a vulcanizate with short fibers and a specific Mooney scorch viscosity, combined with core wires of high elastic modulus, where the short fibers are oriented in the belt width direction to stabilize core wire positions and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the molding die method is used to manufacture V-ribbed belts, then the belt can be produced with fabric-covered rib surfaces, but the core wires are pushed out to the compression rubber side or bite into the tension rubber causing position variation in the belt thickness direction
Solution Approach 1:
The invention changes the physical-chemical parameters of the rubber composition by incorporating specific proportions of short fibers (15-50 parts by mass per 100 parts by mass of rubber component) and controlling the minimum Mooney scorch viscosity (70-130 at 125°C). This modifies the rubber's flow characteristics during molding to prevent core wire displacement while maintaining manufacturability through the molding die method.
Solution Approach 2:
The invention creates a composite rubber composition by combining rubber components with short fibers. This composite structure provides both the elasticity needed for belt operation and the viscosity control necessary to stabilize core wire positions during the molding process, resolving the contradiction between ease of manufacture and manufacturing precision.
2Ease of operation
If low-modulus fibers are included in the rubber composition, then the belt structure becomes more flexible, but the transmission capacity decreases
Solution Approach 1:
The invention optimizes the fiber content parameters within a specific range (15-50 parts by mass per 100 parts by mass of rubber component) to achieve the right balance. This controlled parameter change ensures sufficient flexibility for belt operation while maintaining adequate transmission capacity, avoiding the extremes of too much or too little fiber reinforcement.
Solution Approach 2:
The invention applies short fibers locally within the rubber composition rather than using uniform fiber distribution throughout all belt components. This localized reinforcement approach provides flexibility where needed while preserving transmission capacity in the core structural elements, resolving the contradiction between operational flexibility and power transmission capability.
3Ease of manufacture
If no short fibers are added to the rubber composition, then the manufacturing cost is lower, but the core wire positions cannot be stabilized in the belt thickness direction
Solution Approach 1:
The invention modifies the rubber composition parameters by adding short fibers within a controlled range (15-50 parts by mass per 100 parts by mass of rubber component). This parameter change provides the necessary viscosity control to stabilize core wire positions while keeping the fiber content low enough to minimize additional manufacturing costs, achieving a cost-effective solution to the precision problem.
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 solution effectively stabilizes core wire positions in the belt thickness direction, enhancing durability and maintaining a simple, cost-effective structure while ensuring high transmission capacity.
Implementation Method 1
the rubber composition has a minimum Mooney scorch viscosity measured at 125° C. of 70-130
Implementation Method 2
a tension rubber layer made of a vulcanizate of a rubber composition including short fibers
Data Source
AI summary
A V-ribbed belt which comprises core wires and a stretch rubber layer constituted of a vulcanizate of a rubber composition comprising a rubber ingredient and short is provided. The content of the short fibers in the rubber composition is 15-50 parts by mass per 100 parts by mass of the rubber ingredient and the rubber composition has a minimum Mooney scorch viscosity, as measured at 125° C., of 70-130.