Roll Blind Structure With Dual Roller Guide For Uniform Winding
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Solution Overview
Problem
Conventional double roller type panorama sunroof apparatuses suffer from uneven blind winding, wrinkles, malfunction due to lack of guide structure, and environmental temperature-induced slipping or failure in roller operation.
Innovation Solution
A roll blind structure with a double roller system featuring a roller guide with protruding guide portions, springs for maintaining a constant gap between rollers, serrated and gear portions on the roller tube, and a hook-shaped fastening mechanism to ensure uniform blind winding and prevent slipping, while allowing for easy assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chain structure is used to couple main roller and idle roller, then the blind can be wound around the rollers, but the blind becomes unevenly wound and wrinkles occur due to lack of guide structure
Solution Approach 1:
A guide structure is introduced as an intermediary component between the chain and the blind. This guide structure includes guide portions that extend in the vehicle width direction and guide the blind as it is being wound, ensuring uniform winding and preventing wrinkles without requiring complex additional mechanisms
Solution Approach 2:
The guide structure is segmented into multiple guide portions distributed along the chain length. Each guide portion independently guides the blind at different locations, ensuring uniform winding throughout the entire blind length while maintaining structural simplicity
2Adaptability or versatility
If the chain is allowed to contract or expand due to environmental temperature, then the chain can adapt to temperature changes, but the blind slips without being tightly wound or the rollers fail to operate
Solution Approach 1:
The guide structure parameters (position, orientation, spacing of guide portions) are designed to remain constant relative to the chain, while the chain itself is allowed to expand and contract. This ensures the blind remains tightly guided and wound even as the chain length changes with temperature
Solution Approach 2:
The guide structure is designed in advance to accommodate chain expansion and contraction by providing continuous guidance along the entire chain length. This prevents slipping and ensures reliable operation across temperature variations without requiring active compensation mechanisms
3Device complexity
If only the side portion of the chain is driven through sprockets, then the structure is simpler, but the central part of the chain deflects
Solution Approach 1:
The guide structure provides localized guidance at multiple points along the chain, with guide portions strategically positioned to support the central chain section. This distributed local support prevents central deflection without requiring complex overall structural changes
Solution Approach 2:
The guide portions extend in the vehicle width direction (perpendicular to the chain's primary length direction), providing guidance in a different dimension. This dimensional approach stabilizes the central chain portion by constraining it laterally rather than requiring additional longitudinal support structures
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
The solution ensures uniform blind winding, maintains a constant roller tube tension, prevents wrinkling and slipping, and simplifies roller replacement, thereby enhancing the reliability and efficiency of the sunroof shading system.
Implementation Method 1
a roller guide that is coupled to both ends of the main roller and the idle roller and includes a guide portion formed to protrude so that the blind maintains a constant height
Implementation Method 2
a main roller disposed at one end of the sunroof frame in a vehicle width direction and rotating through a motor
Data Source
AI summary
A structure of a roll blind that moves in a front-back direction of a vehicle to selectively shade a sunroof glass may include a pair of sunroof frames formed on both lower sides of the sunroof glass in a longitudinal direction of the vehicle, a main roller disposed at the one end of the sunroof frame in a vehicle width direction and can rotate through a motor, an idle roller disposed in the vehicle width direction adjacent to the main roller, a roller tube coupled to and wrapping the main roller and the idle roller to form a closed loop, and a roller guide coupled to both ends of the main roller and the idle roller and including a guide portion formed to protrude so that the blind maintains a constant height.