Low-Elongation Toothed Belts to Inhibit Tooth Jump
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Solution Overview
Problem
Industrial belts, particularly those used in power transmission systems, often experience 'tooth jump' due to insufficient rigidity and durability under load, leading to elongation and reduced efficiency and durability.
Innovation Solution
The development of toothed belts with a curvature coefficient of less than 0.01% and a compressibility coefficient of no more than 0.00075, incorporating load-carrying fiber cords like carbon cords with open porosity of 10 vol-% or less, which are designed to minimize elongation under load and prevent tooth jump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the belt is made more rigid and durable to prevent tooth jump, then the belt's strength and reliability improve, but the belt's elongation under load increases
Solution Approach 1:
The belt employs a composite construction combining a polyurethane body with embedded load-carrying fiber cords (aramid, polyester, or nylon). This composite structure allows the belt to achieve high strength and tooth jump resistance while maintaining limited elongation, as the fiber cords bear the load and restrict excessive stretching of the polyurethane matrix.
Solution Approach 2:
The invention specifies precise parameter ranges to optimize performance: curvature coefficient of less than 0.01% and compressibility coefficient of no more than 0.00075. These parameter controls ensure the belt maintains rigidity for tooth jump prevention while limiting elongation under operational loads.
2Strength
If the belt uses load carrying fiber cords with low porosity to reduce elongation, then the belt's rigidity improves, but the manufacturing complexity increases
Solution Approach 1:
The invention specifies that load-carrying fiber cords should have open porosity of 10 vol-% or less, with preferred embodiments at 5 vol-% or less. This controlled porosity allows the fiber cords to maintain rigidity and load-bearing capacity while accommodating the manufacturing process and ensuring proper bonding with the polyurethane body.
Data Source
AI summary
Endless belts, such as for use with e-bikes and other personal mobility systems such as standard bicycles, wheelchairs, scooters including electric scooters, and other systems that utilize a belt for transmitting power to impart motion to the system. The belts are particularly suited for inhibiting “tooth jumping” during use, having a curvature coefficient of no more than 0.01%, and in some embodiments less than 0.005%, with a compressibility coefficient of no more than 0.00075. The belts can utilize reinforcing cords, such as carbon cords, which when incorporated into the final belt, some cords have an open porosity of 10 vol-% or less, in some embodiments 5 vol-% or less.