Bicycle Belt Tension Roller Layout for Direct Spring Force Transfer
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Solution Overview
Problem
Existing bicycle belt tensioning devices are inefficient in transmitting forces to the tension roller, requiring strong springs and complex lever mechanisms, which limits effective belt tensioning.
Innovation Solution
A bicycle frame element with a belt tensioning device featuring a tension roller connected to a swivel lever via a receiving element, with a tensioning element arranged between the lever and the frame, utilizing an elastic clamping element and a tension spring for efficient power transmission, allowing the tension roller to press against the belt's underside, where no tensile forces act, ensuring reliable and automatic belt tensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional lever mechanism with a tension spring is used, then the belt tensioning device can maintain belt tension, but only a small portion of the spring forces are transmitted to the tensioning pulley, requiring a relatively strong spring
Solution Approach 1:
Instead of having the spring press against a lever arm that mechanically disadvantages force transmission, the patent inverts the approach by having the spring act directly on the tensioning pulley through a simplified connection. The spring force is applied in a direction that maximizes its effect on the belt, eliminating the need for complex lever mechanisms and improving force transmission efficiency.
Solution Approach 2:
The patent extracts the essential function of force transmission from the complex lever mechanism and implements it through a simplified direct connection between the spring and tensioning pulley. By removing unnecessary intermediate lever elements, the design achieves better force transmission with reduced mechanical complexity.
2Extent of automation
If a tension spring is provided between the lever and the frame, then automatic tensioning can be achieved, but the lever mechanism becomes relatively complex to accommodate the tension spring
Solution Approach 1:
The patent extracts the automatic tensioning function from the complex lever mechanism and implements it through a simplified spring-pulley system. The spring is directly connected to the tensioning pulley, eliminating the need for complex lever arms while maintaining automatic tensioning capability.
Solution Approach 2:
Instead of using a lever mechanism to translate spring force into belt tension, the patent inverts the approach by having the spring act directly on the tensioning pulley. This inversion simplifies the mechanism while preserving automatic tensioning functionality.
3Force
If the tensioning roller presses against the belt from above, then belt tensioning can be achieved, but the structure requires more space and may interfere with other bicycle components
Solution Approach 1:
Instead of pressing the tensioning roller against the top of the belt, the patent inverts the approach by pressing against the underside of the belt. This inversion allows for a more compact arrangement that reduces interference with other bicycle components while maintaining effective belt tensioning.
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
This configuration ensures reliable and automatic belt tensioning with improved power transmission, reducing the need for frequent adjustments and enhancing the performance of bicycles with electric motor support by maintaining optimal belt tension.
Implementation Method 1
the clamping element is an elastic element, and in particular, the clamping element is designed as an elastic element
Implementation Method 2
a tension spring is provided between the lever and the seat tube
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a belt tensioning device for drive belts of a bicycle frame, which comprises a tensioning roller (30). The tensioning roller (30) is rotatably supported via a receiving element (28) by a pivoting lever (26). The pivoting lever (26) is pivotably fastened via a holding element (24) to the bicycle frame. Furthermore, a tensioning element (32) is connected to the pivoting lever (26) and the bicycle frame. In order to provide a good force transmission, the tensioning element (32) is connected to the pivoting lever (26) between the holding element (24) and the receiving element (28).