Power Transmission Belt with Multiwoven Cloth Layer
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Solution Overview
Problem
Power transmission belts with twisted load carrying members suffer from inadequate bending fatigue characteristics and initial elongation issues under high loads, leading to premature breakage and noise generation due to contact with pulley flanges, which existing technologies have not adequately addressed.
Innovation Solution
A power transmission belt design featuring a rubber body with embedded load carrying members and a multiwoven cloth layer, where the load carrying members have a controlled twist multiplier and cross-sectional area, and the cloth layer includes fluorine-based fibers and low melting point fibers to enhance durability and reduce noise by minimizing contact with pulley flanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If twisted load carrying members with large cross-sectional area are used to achieve high modulus properties, then the belt can maintain engagement under high load, but the bending fatigue characteristics deteriorate and initial elongation increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the cross-sectional area of load carrying members within the range of 0.15-0.30 mm² per member and the twisting number within 1.5-2.5. This optimization resolves the contradiction by finding the optimal parameter values that provide sufficient modulus while avoiding excessive initial elongation and maintaining bending fatigue resistance.
Solution Approach 2:
The patent uses composite materials by combining rubber with embedded load carrying members made from high modulus fibers (glass, carbon, aramid, or PBO). This composite structure allows the belt to achieve the necessary strength and modulus properties while the rubber matrix provides flexibility and fatigue resistance, resolving the contradiction between strength and reliability.
2Reliability
If twisting number of load carrying members is increased to improve bending fatigue characteristics, then durability under bending improves, but initial elongation becomes significantly larger
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the twisting number to fall within the specific range of 1.5-2.5. This controlled twisting provides sufficient bending fatigue resistance while limiting initial elongation, achieving a balance between the two competing requirements.
3Strength
If load carrying members are made with high modulus fiber to increase strength, then the belt can handle high loads, but the belt becomes prone to premature breakage due to reduced bending fatigue resistance
Solution Approach 1:
The patent uses composite materials by embedding high modulus fiber load carrying members in a rubber matrix. The rubber provides flexibility and bending fatigue resistance, while the high modulus fibers provide strength and load carrying capacity. This composite approach resolves the contradiction between strength and reliability.
Solution Approach 2:
The patent applies parameter changes by controlling the cross-sectional area of load carrying members to be within 0.15-0.30 mm² per member. This optimization ensures sufficient strength while maintaining adequate bending fatigue resistance to prevent premature breakage.
Data Source
AI summary
A power transmission belt having a body with a length, a width between laterally spaced sides, and a thickness between inside and outside surfaces. At least one load carrying member extends in a lengthwise direction. The body has a plurality of teeth spaced along at least one of the inside and outside of the body. The teeth have a width that decreases progressively from: a) a first location between the inside and outside surfaces; and b) one of the inside and outside surfaces so that the one surface has a width that is less than a width of the other surfaces. A cloth layer is applied to the one surface and is a multiwoven structure with interwoven: a) warp; and b) at least two different wefts.