Cogged V-Belt Aramid Fiber Compression Layer Pop-Out Prevention
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Solution Overview
Problem
Conventional cogged V-belts experience premature 'pop-out' due to misalignment during speed changes, leading to reduced belt life, as they lack sufficient stretchability and compressive force absorption, resulting in tension members jumping out of the belt body.
Innovation Solution
A power transmission belt design with a tension member and a compression rubber layer featuring aramid fibers, where the belt's stiffness in the width direction is reduced and elongation in the length direction is increased, allowing for deformation under compression and elongation under tension, thereby absorbing forces and delaying the occurrence of pop-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If short fibers are added to the compression rubber layer to improve lateral pressure resistance, then lateral pressure resistance is improved, but bending fatigue resistance deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the rubber composition by specifying precise proportions of chloroprene rubber (100 parts by weight), aramid short fibers (10-40 parts by weight), bismaleimide (1-15 parts by weight), and other additives. This parameter optimization ensures that the compression rubber layer has sufficient lateral pressure resistance while maintaining bending fatigue resistance, resolving the contradiction between these two properties.
Solution Approach 2:
The invention uses a composite material system combining chloroprene rubber with aramid short fibers and bismaleimide. The aramid short fibers provide reinforcement for lateral pressure resistance, while the bismaleimide acts as a crosslinking agent to maintain elasticity and fatigue resistance. This composite approach allows simultaneous achievement of both improved lateral pressure resistance and maintained bending fatigue resistance.
2Stability of the object's composition
If the belt is made stiffer to maintain shape during speed changes, then shape stability is improved, but the ability to absorb compressive force deteriorates
Solution Approach 1:
The invention optimizes the rubber composition parameters, specifically using chloroprene rubber with controlled amounts of aramid short fibers (10-40 parts by weight per 100 parts by weight of rubber) and bismaleimide (1-15 parts by weight). This creates a rubber matrix with balanced mechanical properties that maintains shape stability while preserving compressive force absorption capability during speed changes.
Solution Approach 2:
The composite material system of chloroprene rubber, aramid short fibers, and bismaleimide creates a rubber layer with optimized mechanical properties. The aramid fibers provide structural support for shape stability, while the chloroprene rubber matrix and bismaleimide crosslinking maintain elasticity and compressive force absorption, resolving the contradiction between stiffness and compressive force absorption.
3Strength
If aramid short fibers are increased to improve lateral pressure resistance, then lateral pressure resistance is improved, but bending fatigue resistance deteriorates
Solution Approach 1:
The invention precisely controls the amount of aramid short fibers to be 10-40 parts by weight per 100 parts by weight of chloroprene rubber, and bismaleimide to be 1-15 parts by weight. This parameter range optimization ensures sufficient lateral pressure resistance while preventing excessive fiber content that would deteriorate bending fatigue resistance. The controlled parameter range resolves the contradiction between these two properties.
Solution Approach 2:
The invention uses a balanced composite material system where aramid short fibers (10-40 parts by weight) provide lateral pressure resistance, chloroprene rubber (100 parts by weight) provides the rubber matrix, and bismaleimide (1-15 parts by weight) provides crosslinking. This balanced composition ensures that lateral pressure resistance is improved without excessive fiber content that would harm bending fatigue resistance.
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 design effectively prolongs the time before pop-out occurs, enhancing the belt's life by allowing it to absorb compressive and tensile forces during speed changes and misalignment, thus improving durability.
Implementation Method 1
elastic modulus in a grain direction (an orientation direction of the short fibers) is increased by the arrangement of the aramid short fibers, thereby maintaining lateral pressure resistance
Implementation Method 2
the belt can absorb a compression force in a belt width direction and a tensile force in a belt lengthwise direction generated when changing a speed
Implementation Method 3
the belt frictionally engages with a pulley on a side surface of the compression rubber layer
Data Source
AI summary
The present invention relates to a power transmission belt provided with a tension member, a tension member-supporting layer, a tension rubber layer, and a compression rubber layer, the belt having a plurality of cog portions, in which the tension member is formed of an aramid fiber, the compression rubber layer is formed of a vulcanized rubber composition containing a rubber component and aramid short fibers embedded in the vulcanized rubber composition with being arranged in a width direction of the belt, the power transmission belt has a strain of from 0.5 to 0.8% when compressed under a stress of 2.0 N/mm2 in the width direction, and the power transmission belt has a strain of from 0.35 to 0.7% when pulled under a load of 2 kN in the lengthwise direction.