Roller Blind Lateral Guidance Using Toothed Belts
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Solution Overview
Problem
Existing roller blind arrangements for motor vehicles suffer from high wear due to the use of driving cables with a rough brush-like surface, which leads to inefficient shading and uncovering of transparent roof sections.
Innovation Solution
The roller blind arrangement uses toothed belts as both driving and guiding elements, where the roller blind web is reshaped into a U-shape within guide tracks, allowing the toothed belts to engage directly with the web material for tensioning and winding, reducing wear and enabling wrinkle-free operation with minimal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If driving cables with a rough brush-like surface are used to wrap and tension the roller blind web, then the roller blind web can be kept tensioned, but high wear occurs on the roller blind web
Solution Approach 1:
The patent replaces the rough brush-like surface mechanical wrapping system with a toothed belt system that uses engaged toothing elements. Instead of relying on friction from a rough surface, the toothed belts engage directly with the roller blind web through interlocking teeth, providing tensioning without the high wear characteristic of brush-like surfaces.
Solution Approach 2:
The toothed belts act as an intermediary between the drive motor and the roller blind web. The toothing on the toothed belts provides a mediating engagement mechanism that transfers force to the roller blind web without the direct frictional contact that causes wear in the conventional brush-like surface system.
2Ease of operation
If the roller blind web is wrapped around driving cables to enable lateral guidance, then guidance is achieved, but the complexity of the device increases
Solution Approach 1:
The toothed belts serve multiple functions simultaneously: they provide lateral guidance for the roller blind web, transmit driving force from the motor, and maintain tension on the web. This multi-functionality eliminates the need for separate guidance cables and driving cables, reducing overall device complexity while maintaining ease of operation.
Solution Approach 2:
The patent merges the functions of lateral guidance and driving force transmission into a single toothed belt system. Instead of having separate cables for guidance and separate mechanisms for driving, the toothed belts combine both functions, simplifying the overall device structure.
3Strength
If the roller blind web is redirected into guide tracks using toothed belts, then retaining strength is enhanced, but the guide rails become wider impeding the viewing area
Solution Approach 1:
The toothed belts have a flexible, belt-like structure that can be made with minimal width while maintaining sufficient retaining strength. This flexibility allows the guide rails to be designed narrower compared to rigid guidance structures, thereby preserving more of the viewing area while still providing the necessary lateral guidance and tension.
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 enhances the retaining strength of the roller blind web, reduces wear, and allows for efficient winding and unwinding with minimal force, while maintaining a clear viewing area and preventing jamming, thus providing a durable and effective shading solution.
Implementation Method 1
The toothed belts can exert a high retaining strength on the roller blind web. Simultaneously, an actuation of the toothed belts can effect a winding up or unwinding of the roller blind web and does this with little force.
Implementation Method 2
Since the redirecting of the roller blind web can be limited and the material of the roller blind web has a certain elasticity, a wrinkle-free winding up of the roller blind web to form a roller blind winding is ensured.
Data Source
AI summary
A roller blind arrangement for a motor vehicle for shading a transparent vehicle section having a roller blind web which can be wound up to form a roller blind winding and is guided at its lateral edges in relation to a vertical longitudinal center plane of the roller blind in each case in a guide rail, as well as a drive device having a drive pinion which drives two driving means each of which is guided in a guide track of one of the guide rails. The driving means are each designed as a toothed belt which has an essentially rectangular cross section and comprises a toothing on at least one side, the teeth of said toothing extending at least approximately perpendicular to the plane of the unwound roller blind web between a lower side of the toothed belt and an upper side of the toothed belt.