Large V-Belt Rubber Layer Structure for Interfacial Fracture Resistance
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Solution Overview
Problem
Large V-belts with embedded fabric members or high-strength fiber sheets face issues with excessive shear stress and interfacial fracture due to differences in elastic modulus, leading to potential damage under high torque conditions, and stress concentration on the rubber portion.
Innovation Solution
The large V-belt design incorporates a reinforced rubber layer made of a rubber composition with a type A durometer hardness of 92 or more, stacked on either side of the adhesive rubber layer, eliminating the need for fabric members and reducing elastic modulus differences, thereby achieving high rigidity in the belt width direction and bendability in the belt length direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fabric members or high-strength fiber sheets are embedded in the adhesive rubber layer, then high rigidity in the belt width direction is achieved, but excessive shear stress and interfacial fracture occur due to differences in elastic modulus
Solution Approach 1:
The patent applies homogeneity by using the same material (rubber composition) for both the adhesive rubber layer and the reinforced rubber layers. This eliminates the elastic modulus difference between different materials, preventing interfacial fracture while maintaining structural integrity and rigidity throughout the belt body.
Solution Approach 2:
The patent uses composite materials by combining multiple layers of rubber composition with different hardness values. The adhesive rubber layer (hardness 90-95) is sandwiched between reinforced rubber layers (hardness 92-98), creating a composite structure that achieves both rigidity and fracture resistance through material composition rather than material contrast.
2Strength
If fabric members are embedded in the adhesive rubber layer, then high rigidity is achieved, but stress concentration occurs on the rubber portion under high torque conditions
Solution Approach 1:
By using homogeneous rubber material throughout all layers, the patent ensures uniform stress distribution under torque loading. The absence of fabric members with different elastic properties eliminates stress concentration points, allowing the rubber portion to withstand high torque without localized failure.
3Strength
If blinds are embedded on each side of the adhesive rubber layer, then both high rigidity in belt width direction and bendability in belt length direction are achieved, but the structure becomes more complex and prone to interfacial fracture
Solution Approach 1:
The patent extracts and eliminates the blind component entirely, replacing it with reinforced rubber layers made of the same rubber composition. This simplification removes the complex multi-material interface while maintaining the desired mechanical properties through the layered rubber structure alone.
Solution Approach 2:
By replacing heterogeneous blind structures with homogeneous rubber layers, the patent reduces structural complexity. The entire belt body consists of rubber composition in different layers and hardness values, eliminating the need for separate blind components and their associated interfaces.
Data Source
AI summary
A large V-belt includes an endless rubber belt body including an adhesive rubber layer and a cord embedded in the adhesive rubber layer of the belt body. The large V-belt has a belt thickness of 15 mm or more and the belt width of 10 mm or more at the center, in a belt thickness direction, of a cord embedded position. The belt body further includes reinforced rubber layers made of a rubber composition having a type A durometer hardness of 92 or more, the reinforced rubber layers being stacked on a belt inner side and/or a belt outer side of the adhesive rubber layer in the belt thickness direction.