Friction Drive Belt Adhesion Layer for Low-Loss High-Load Transmission
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Solution Overview
Problem
Conventional frictional power transmission belts face challenges in achieving both high lateral pressure resistance and fuel saving performance, particularly in high-load environments, where they often experience peeling, deformation, and power transmission loss due to mismatched mechanical characteristics between rubber layers and high friction coefficients.
Innovation Solution
A frictional power transmission belt with an adhesion rubber layer formed from a vulcanized rubber composition containing short fibers with an average diameter of 2 μm or more and a filler, such as silica and carbon black, which balances mechanical characteristics to reduce friction coefficients and enhance adhesiveness, bending fatigue resistance, and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber composition with high mechanical characteristic is used for the adhesion rubber layer to improve lateral pressure resistance, then the lateral pressure resistance is improved, but the bending fatigue resistance decreases and power transmission loss increases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the rubber hardness of the adhesion rubber layer to be within 75° to 89° and the compression stress/bending stress ratio to be within 0.4 to 0.65. These optimized parameters enable the rubber layer to simultaneously achieve adequate lateral pressure resistance and maintain bending fatigue resistance, resolving the contradiction between strength and durability.
Solution Approach 2:
The patent uses composite materials by combining specific rubber components (chloroprene rubber, ethylene-propylene copolymer, ethylene-propylene-diene terpolymer) with fillers (silica, carbon black) and fiber reinforcing materials (aramid short fibers, polyester short fibers). This composite structure provides both the lateral pressure resistance and bending fatigue resistance that single materials cannot achieve alone.
2Power
If the friction coefficient of the adhesion rubber layer is increased to improve power transmission, then the power transmission capability is improved, but the power transmission loss increases and fuel saving performance deteriorates
Solution Approach 1:
The patent applies local quality by creating different surface properties in different layers. The adhesion rubber layer has a controlled friction coefficient of 0.8 to 1.2, which is optimized to balance power transmission capability with energy efficiency. This localized optimization of friction characteristics in the adhesion layer resolves the contradiction between power transmission and energy loss.
3Strength
If the mechanical characteristic of the adhesion rubber layer is mismatched with compression and tension rubber layers, then the lateral pressure resistance is improved, but peeling occurs between layers
Solution Approach 1:
The patent applies parameter changes by optimizing the compression stress/bending stress ratio of the adhesion rubber layer to be within 0.4 to 0.65 and the rubber hardness to be within 75° to 89°. These parameter adjustments ensure compatible mechanical characteristics between the adhesion rubber layer and the compression/tension rubber layers, preventing peeling while maintaining lateral pressure 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 solution improves power transmission efficiency and durability by reducing friction coefficients to match those of compression and tension rubber layers, preventing peeling, and maintaining adhesiveness, thus achieving both lateral pressure resistance and fuel saving performance under high-load conditions.
Implementation Method 1
an adhesion rubber layer in contact with at least a portion of the tension member, wherein the adhesion rubber layer is formed of a vulcanized rubber composition containing a rubber component, short fibers having an average fiber diameter of 2 μm or more, and a filler
Implementation Method 2
power is transmitted by utilizing an energy accompanying a friction generated by a thrust between the V-shaped side surface and the V-groove of the pulley
Data Source
AI summary
The present invention pertains to a frictional power transmission belt including a tension member extending in the longitudinal direction of the belt and an adhesion rubber layer in contact with at least a portion of the tension member, in which the adhesion rubber layer is formed of a vulcanized rubber composition containing a rubber component, short fibers having an average fiber diameter of 2 μm or more, and a filler.