Endless Belt Pulley Flange Layout to Prevent Rupture
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Solution Overview
Problem
Existing drive transmission devices with endless belts face issues of belt rupture due to stress concentration when flanges are used to prevent belt separation, and without flanges, the belt may separate from the pulley.
Innovation Solution
A drive transmission device with multiple pulleys and an endless belt, where a first flange is strategically placed on a pulley forming the longest belt section, restricting axial movement of the belt and minimizing contact force to prevent rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange is provided on a pulley to prevent the endless belt from being separated, then the belt separation is prevented, but stress concentration occurs and causes rupture of the endless belt
Solution Approach 1:
The patent applies different flange configurations to different pulleys based on their specific positions and functions in the belt transmission system. The first pulley (driving pulley) has no flange or a small flange, while other pulleys have appropriately sized flanges. This localized differentiation allows the system to prevent belt separation where needed while minimizing stress concentration and rupture risk at critical locations.
Solution Approach 2:
Instead of providing flanges on all pulleys to prevent belt separation, the patent inverts the conventional approach by deliberately omitting flanges from the driving pulley (first pulley) and selectively applying them to other pulleys. This inversion resolves the contradiction by preventing separation through alternative means while eliminating the source of stress concentration at the most critical location.
2Strength
If no flange is provided on the pulley, then the endless belt rupture is prevented, but the endless belt may be separated from the pulley
Solution Approach 1:
The patent implements selective flange placement where the driving pulley (first pulley) operates without a flange or with a minimal flange to prevent belt rupture, while other pulleys in the system are equipped with appropriately sized flanges to prevent belt separation. This localized quality differentiation resolves the contradiction by addressing each pulley's specific functional requirements.
Solution Approach 2:
The patent introduces intermediate measures such as belt tensioning devices, guide structures, or alternative retention mechanisms that prevent belt separation without requiring flanges on the driving pulley. These intermediary elements mediate between the need to prevent separation and the need to avoid stress concentration, allowing the system to achieve both objectives.
3Stability of the object's composition
If flanges are provided on all pulleys to restrict axial movement of the endless belt, then axial movement is restricted, but stress concentration occurs and causes belt rupture
Solution Approach 1:
The patent applies flanges with different dimensions and configurations to different pulleys based on their specific requirements. The driving pulley has no flange or a small flange to maintain axial stability without causing stress concentration, while other pulleys have larger flanges providing stronger axial restraint. This localized quality approach allows the system to achieve overall axial stability while minimizing rupture risk at critical locations.
Data Source
AI summary
A drive transmission device includes a plurality of pulleys including three or more pulleys, and an endless belt stretched over the plurality of pulleys and in which a plurality of linear belt sections each formed between two of the pulleys are formed, wherein a first flange is provided on a first pulley which is the pulley that forms a longest belt section and does not form a shortest belt section among the plurality of belt sections, and a gap between the first flange and a side surface of the endless belt is smaller than a gap between a flange provided on another pulley and the side surface of the endless belt.