Vehicle Roll-Screen Guide Rail Structure to Prevent Sheet Fall-Out
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Solution Overview
Problem
The existing roll-screen devices for vehicles face issues where the engagement belt fails to properly engage with the guide rail, causing the light-shielding sheet to easily fall out, as the side edge of the sheet must be housed in the guide rail while the engagement belt also engages with the wall section.
Innovation Solution
The roll-screen device incorporates guide sections with guide pieces that create a distance between the engagement belt and the sheet body before entering the guide rail, ensuring the engagement belt engages with the guide rail, preventing the sheet from falling out by using guide rails with engagement wall sections and guide pieces that guide the sheet body and engagement belts into the correct position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the side edge part of the light-shielding sheet is housed in the guide rail, then the sheet can be guided properly, but the engagement belt cannot be properly engaged with the guide rail causing the sheet to fall out
Solution Approach 1:
The guide rail is divided into two distinct functional sections: a guide section for housing the side edge part of the sheet body, and an engagement section with engagement wall sections for engaging the engagement belt. This segmentation allows each section to perform its specific function effectively without interference from the other component.
Solution Approach 2:
Different portions of the guide rail are given different structural characteristics: the guide section has a cross-sectional shape matching the side edge of the sheet body for proper guidance, while the engagement section has engagement wall sections extending in the sheet width direction to engage the engagement belt. This local differentiation ensures both guiding and engagement functions are optimized.
2Device complexity
If the engagement belt is formed by folding back the side edge of the light-shielding sheet, then the structure is simplified, but the engagement belt and sheet body cannot be properly positioned relative to the guide rail
Solution Approach 1:
The engagement belt is pre-formed by folding back the side edge of the sheet body at a predetermined position before assembly. This preliminary action ensures that when the sheet is installed in the guide rail, the engagement belt is already in the correct position and orientation to engage with the engagement wall sections, eliminating positioning issues during operation.
Data Source
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AI summary
A roll-screen device (4) includes a winding roller (5), a light-shielding sheet (41), guide rails (22), and guide sections (7). The light-shielding sheet includes a sheet body (41a), and engagement belts (43) provided along side edges at both sides of the sheet body in a vehicle width direction. The sheet body and the engagement belts are rolled up on the winding roller such that the sheet body and the engagement belts overlap each other. Each guide rail (22) includes engagement wall section (23d) which is located at a vehicle widthwise inner side of the engagement belt and engages with the engagement belt to prevent the light-shielding sheet (41) from falling out of the guide rail. The guide section (7) includes a guide piece (71) configured to put a distance between the engagement belt and the sheet body before the light-shielding sheet enters the guide rail.