Friction Belt Rubber Modulus Balance for Wear and Crack Resistance
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Solution Overview
Problem
Existing friction transmission belts, such as V-ribbed belts, face challenges in achieving both wear durability and crack durability, with conventional methods focusing on reinforcing fabrics and pulley contact surfaces without addressing the modulus ratio of the rubber composition effectively.
Innovation Solution
A friction transmission belt with a compression layer having a specific modulus ratio (M10 modulus/M50 modulus) of at least 1.5, preferably 2.0, in the rubber composition, ensuring both good wear and crack durability by optimizing the M10 and M50 modulus values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional reinforcing fabrics and pulley contact surfaces are used, then wear durability is improved, but crack durability deteriorates
Solution Approach 1:
The invention changes the physical-chemical parameters of the rubber composition by controlling the M10 modulus to be 1.05 to 1.30 MPa and M50 modulus to be 0.18 to 0.35 MPa, with their ratio being 3.5 to 5.5. This parameter optimization allows the rubber to provide adequate wear resistance while maintaining flexibility to prevent crack propagation, resolving the contradiction between wear durability and crack durability
Solution Approach 2:
The invention uses a composite structure combining rubber composition with specific physical properties and reinforcing fabrics. The rubber layer with optimized modulus characteristics works synergistically with the reinforcing fabric to provide both wear resistance and crack resistance, achieving both durability requirements simultaneously
2Duration of action of stationary object
If rubber composition with high wear resistance is used, then wear durability is improved, but flexibility deteriorates leading to increased cracking
Solution Approach 1:
The invention optimizes the physical-chemical parameters of the rubber composition by setting M10 modulus to 1.05 to 1.30 MPa and M50 modulus to 0.18 to 0.35 MPa. This creates a rubber with balanced properties: sufficient hardness for wear resistance but adequate elasticity (indicated by the specific modulus ratio of 3.5 to 5.5) to maintain flexibility and resist cracking under dynamic loading conditions
Data Source
AI summary
A friction transmission belt includes a compression layer forming a pulley contact portion, the compression layer includes an inner layer formed from a rubber composition and an outer layer provided on a pulley contact side of the inner layer and formed from a fiber member, and a ratio (M10 modulus/M50 modulus) of an modulus at 10% elongation in a belt longitudinal direction (M10 modulus) to an modulus at 50% elongation in the belt longitudinal direction (M50 modulus), of the rubber composition, is not less than 1.5.