Nubbed Belt Profile for Stable Torque on Circumferentially Grooved Pulleys
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Solution Overview
Problem
Existing nubbed belts are not optimized for use with pulleys having circumferential grooves, leading to suboptimal torque transmission performance compared to those with recesses spaced apart in a circumferential direction for synchronous transmission.
Innovation Solution
A nubbed belt with a body made of polymer or elastomer material, featuring reinforcement threads and projecting blocks arranged in parallel rows with a consistent pitch, designed to engage both cylindrical and grooved pulleys, ensuring synchronous transmission by adapting the nub shape and distribution to match pulley profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If nubbed belts are used with pulleys having circumferential grooves, then the belt can be used with both cylindrical and grooved pulleys providing versatility, but the torque transmission performance is suboptimal compared to synchronous transmission with recesses
Solution Approach 1:
The patent applies local quality by giving different geometric characteristics to different parts of the same nub. Each nub has an inclined side surface with a specific inclination angle (α) that is optimized for engagement with circumferential grooves, while the top surface provides engagement with cylindrical pulleys. This local differentiation allows the belt to perform optimally with both pulley types without compromising versatility or torque transmission performance.
2Stability of the object's composition
If nubs are arranged in parallel longitudinal rows with staggered distribution, then torque oscillations are limited during synchronous transmission, but the engagement with circumferential grooves is not optimized
Solution Approach 1:
The patent applies parameter changes by optimizing the inclination angle (α) of the nub side surfaces to fall within a specific range (10° to 45°). This parameter optimization ensures that the nubs engage effectively with circumferential grooves while maintaining stable torque transmission. The staggered distribution of nubs in parallel rows is combined with this angular parameter optimization to achieve both torque stability and improved groove engagement.
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 belt achieves reduced torque oscillations and enhanced torque transmission by engaging pulleys with circumferential grooves, providing a simple and cost-effective solution that maintains flexibility and efficiency in transmission and synchronization.
Implementation Method 1
the transmission of torque would take place in areas of contact between the inclined sides of the grooves and the side surface of the nubs with the shape of a truncated cone
Data Source
Figure 1
Figure 2~3
Figure 4~7
AI summary
A belt (1) having a rear face (7) and a front surface (9), which is opposite the rear face (7), is suitable to be coupled to at least one pulley (14, 19, 29) and has a plurality of nubs (11), which project from a band portion (3), in which cords (6) are embedded; the nubs (11) have the same shape and sizes as one another, are arranged along a plurality of rows (13) parallel to a longitudinal axis (4) of the belt (1), and are longitudinally spaced apart from one another with a constant pitch; each nub (11) ends, in a longitudinal direction, with two end portions (21) opposite one another and is provided with an intermediate portion (25), which joins the end portions (21) to one another and has two sides (26), which are parallel to the longitudinal axis (4).