Double-Sided Toothed Belt Geometry for Smooth Pulley Meshing
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Solution Overview
Problem
Double-side-toothed belts with non-coincident inner and outer tooth portions suffer from increased bending rigidity and poor meshing with pulleys, leading to vibration and reduced durability, and existing solutions like differing rubber hardness increase manufacturing complexity and costs.
Innovation Solution
A double-side-toothed belt design where inner and outer tooth portions have equal pitches and coincident positions, with inner tooth portions having flat side faces and outer tooth portions having curved side faces, allowing for different transmission capacities and improved meshing, reducing bending rigidity and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pitch of inner tooth portions is larger than the pitch of outer tooth portions, then the transmission capacity can be differentiated between inner and outer circumferences, but the positions of inner tooth portions and outer tooth portions do not coincide, causing increased bending rigidity and poor meshing with pulleys
Solution Approach 1:
The patent applies local quality by making the side faces of outer tooth portions curved while keeping inner tooth portions standard, allowing different transmission capacities at different locations while maintaining coincident positions. This localized modification enables the outer circumference to handle higher loads without affecting the overall belt geometry or meshing quality.
Solution Approach 2:
The patent introduces asymmetry by giving curved side faces to outer tooth portions while keeping inner tooth portions symmetric with flat side faces. This asymmetric design allows the outer tooth portions to have higher transmission capacity through better contact with pulleys, while the inner tooth portions maintain standard geometry for reliable meshing.
2Adaptability or versatility
If different rubber hardness is provided between inner and outer tooth portions, then the transmission capacity can be differentiated, but the number of manufacturing steps increases and manufacturing cost increases
Solution Approach 1:
The patent applies local quality by modifying only the side face geometry of outer tooth portions while keeping the rubber hardness uniform throughout the belt. This localized geometric modification achieves transmission capacity differentiation without requiring complex multi-material manufacturing processes, thus avoiding increased manufacturing complexity and cost.
3Adaptability or versatility
If the positions of inner tooth portions and outer tooth portions do not coincide, then the transmission capacity can be differentiated, but the bending rigidity of the belt increases and vibration increases
Solution Approach 1:
The patent applies local quality by modifying only the side face geometry of outer tooth portions while maintaining coincident positions of all tooth portions. This localized modification achieves transmission capacity differentiation without disrupting the overall belt flexibility and meshing quality, thereby preventing increased vibration and premature belt deterioration.
Data Source
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AI summary
The present invention relates to a double-sided toothed belt having a plurality of inner teeth arranged on the inner circumferential side of the belt at a prescribed pitch along the lengthwise direction of the belt; and a plurality of outer teeth arranged on the outer circumferential side of the belt at a prescribed pitch along the lengthwise direction of the belt. The double-sided toothed belt is characterized in that: the pitch of the plurality of inner teeth and the pitch of the plurality of outer teeth are equal; the positions of the inner teeth and the outer teeth along the lengthwise direction of the belt match; and the tooth shapes of the inner teeth and the outer teeth are dissimilar.