Friction Belt Rubber Composition for Wet Noise Reduction
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Solution Overview
Problem
Friction transmission belts experience abnormal noise when wet due to stick-slip phenomena at the pulley contact surface, which is not effectively addressed by existing technologies.
Innovation Solution
A friction transmission belt with a rubber layer comprising a rubber composition containing polyolefin particles and an inorganic filler, where the total content of these components is 85 parts by mass or more relative to the rubber component, enhancing wear resistance and reducing abnormal noise by improving the hydrophilicity of the pulley contact surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyethylene particles are dispersed in the pulley contact surface, then wear resistance is improved, but abnormal noise increases when the belt is wet
Solution Approach 1:
The patent uses a composite rubber composition containing both polyethylene particles (for wear resistance) and hydrophilic inorganic filler particles (for noise reduction). The synergistic combination of these two different materials allows the belt to simultaneously achieve high wear resistance and low abnormal noise in wet conditions, resolving the technical contradiction between these two properties.
Solution Approach 2:
The patent creates local quality differences within the pulley contact surface by dispersing polyethylene particles and hydrophilic inorganic filler particles throughout the rubber composition. This localized distribution of different materials with specific functions allows the surface to exhibit both high wear resistance (from polyethylene) and low noise generation (from hydrophilic inorganic filler) in different local areas, collectively solving the contradiction.
2Strength
If the rubber composition contains high content of fillers and particles, then wear resistance improves, but the belt becomes too hard and loses flexibility
Solution Approach 1:
The patent carefully controls the parameters of the rubber composition, specifically setting the total content of polyethylene particles and inorganic filler to 50-150 parts per 100 parts of rubber, with each component individually limited to 1-80 parts. This parameter optimization ensures that the belt achieves sufficient wear resistance while maintaining appropriate flexibility and elastic properties for proper belt operation.
Solution Approach 2:
The patent uses different types of particles (polyethylene and hydrophilic inorganic filler) with different local properties to achieve a balanced composition. The polyethylene particles provide wear resistance while the hydrophilic inorganic filler particles contribute to flexibility and noise reduction, creating a locally differentiated structure that collectively provides both hardness and flexibility.
3Power
If the pulley contact surface is made hydrophobic for better friction, then power transmission improves, but abnormal noise increases in wet conditions
Solution Approach 1:
The patent employs a composite material strategy where polyethylene particles (hydrophobic) provide good friction and power transmission, while hydrophilic inorganic filler particles (such as silica, alumina, or titania) reduce abnormal noise in wet conditions. The combination of materials with opposite hydrophobicity characteristics allows the belt to simultaneously achieve good power transmission and low noise generation.
Solution Approach 2:
The hydrophilic inorganic filler particles act as an intermediary substance between the rubber matrix and the water environment. These particles interact with water molecules, forming a hydrophilic interface that reduces the stick-slip effect and abnormal noise, while the polyethylene particles maintain the necessary friction characteristics for power transmission.
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 significantly reduces abnormal noise in wet conditions by minimizing stick-slip and maintaining power transmission performance, with the polyolefin particles and inorganic filler combination improving wear resistance and flex fatigue resistance.
Implementation Method 1
Friction transmission belt
Implementation Method 2
enhancing wear resistance
Implementation Method 3
abnormal noise when wet due to stick-slip phenomena
Implementation Method 4
improving the hydrophilicity of the pulley contact surface
Implementation Method 5
friction transmission belt
Implementation Method 6
maintaining power transmission performance, with the polyolefin particles and inorganic filler combination improving wear resistance and flex fatigue resistance
Data Source
AI summary
In a friction transmission belt including a rubber layer forming a pulley contact surface, the rubber layer includes a rubber composition containing polyolefin particles and an inorganic filler. In the rubber composition, a total content of the polyolefin particles and the inorganic filler with respect to 100 parts by mass of a rubber component is 85 parts by mass or more.