Transmission Belt Element Geometry to Prevent Disarrangement
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Solution Overview
Problem
The transmission belt with pillar portions experiences disarrangement and generates vibration and noise when torque is transmitted between pulleys due to increased compaction amount of pillar portions compared to rocking edge portions, leading to potential element disarrangement under compression force.
Innovation Solution
The transmission belt is designed with elements having a trunk portion, pillar portions, and a ring, where the rocking edge portions are formed with a convex surface extending over the pillar portions, and a non-contact portion along the saddle surface, ensuring S/A≥3.5 to align the curvature center of the ring with the approximate curve through the rocking edge portions, thereby increasing the compaction amount of rocking edge portions relative to pillar portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the area of the pillar portion is decreased to reduce material cost, then material cost is reduced, but the compaction amount of the pillar portion becomes larger than that of the rocking edge portions, causing element disarrangement and vibration noise
Solution Approach 1:
The patent applies parameter changes by optimizing the surface area of the pillar portion and the width of the rocking edge portions to satisfy the specific relationship S/A≥3.5. This quantitative parameter adjustment ensures that the compaction amount of the rocking edge portions is greater than or equal to that of the pillar portions, preventing element disarrangement while maintaining cost efficiency through controlled material usage.
2Quantity of substance
If the compaction amount of the pillar portion is increased to reduce material usage, then material usage is reduced, but element disarrangement occurs in the chord portion under compression force
Solution Approach 1:
The patent resolves this contradiction by establishing a quantitative relationship between the pillar portion surface area (S) and the rocking edge portion width (A), requiring S/A≥3.5. This parameter optimization ensures that even with reduced material usage in the pillar portions, the compaction distribution remains balanced, preventing element disarrangement in the chord portion during torque transmission.
3Ease of manufacture
If the pillar portion area is reduced to lower manufacturing cost, then manufacturing cost is reduced, but vibration and noise are generated during torque transmission
Solution Approach 1:
The patent eliminates vibration and noise by optimizing the geometric parameters of the element structure. Specifically, by controlling the pillar portion surface area (S) and rocking edge portion width (A) to satisfy S/A≥3.5, the patent ensures uniform compaction distribution that prevents element disarrangement during operation, thereby eliminating the source of vibration and noise while maintaining cost-effective material usage.
Data Source
AI summary
An element of a transmission belt includes a pair of rocking edge portions with a convex surface, these are formed on one of a front face and a rear face to extend a part of the rocking edge portion over a pillar portion, and the rocking edge portions are spaced away from each other in a width direction; and a non-contact portion extended along a saddle surface in the width direction between the rocking edge portions, in non-contact with an adjacent element. S/A≥3.5 is satisfied, when a sum of widths of end portions of the rocking edge portions on an outer peripheral side of the transmission belt is set as “A”. A sum of surface areas of parts of the pillar portions on the outer peripheral side of the transmission belt is set as “S”.