Roller Cassette Connecting Web for Torsional Rigidity
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Solution Overview
Problem
Generic roller blind cassettes with slotted hollow profiles face a trade-off between reduced torsional rigidity and increased mass due to the need for thick central sheets, which is undesirable in vehicle components where mass reduction is essential for efficiency.
Innovation Solution
The integration of a connecting web that connects opposite edge regions of the hollow profile, preventing rotational mobility and enhancing torsional rigidity, allows for a reduction in material thickness while maintaining stability, using screw or rivet connections and a plug-in section design for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick central sheets with wall thicknesses greater than 1.5 mm are used in slotted hollow profiles, then torsional rigidity is sufficient, but mass becomes comparatively large
Solution Approach 1:
The connecting web is divided into multiple segments (first connecting web and second connecting web) that connect opposite edge regions at different locations along the longitudinal axis. This segmentation allows the torsional rigidity to be distributed and achieved with thinner sheet material rather than requiring a single thick continuous web.
Solution Approach 2:
The solution transitions from increasing thickness in one dimension (wall thickness >1.5mm) to distributing structural reinforcement across multiple dimensions by adding connecting webs at different longitudinal positions and connecting opposite edge regions, achieving torsional rigidity through spatial distribution rather than material thickness.
2Ease of manufacture
If slotted hollow profiles are used instead of closed hollow profiles, then production effort and costs are reduced, but torsional rigidity is significantly reduced
Solution Approach 1:
The connecting webs are designed as separate components that can be attached to the slotted hollow profile in discrete locations, allowing the simple slotted profile structure to be retained while adding targeted reinforcement segments that restore torsional rigidity without requiring a complex closed profile design.
Solution Approach 2:
The connecting webs act as intermediary elements that bridge the opposite edge regions of the slotted hollow profile, providing the missing torsional rigidity that the simple slotted profile lacks, while preserving the manufacturing advantages of the slotted design.
Data Source
Figure 1a~3
Figure 4a~5b
Figure 6a~6b
AI summary
The invention relates to a roller cassette for receiving a roller tube and a roller blind web wound on the roller tube in a stowed state and which can be pulled away from the roller tube in a longitudinal direction through an exit slot (312) of the roller cassette, with a housing which has a continuously slotted hollow profile (210) extending transversely to the longitudinal direction in a main extension direction, the slot (312) of which forms the exit slot (312) of the roller cassette.According to the invention, a connecting web extends from at least one edge region (312a, 312b) at at least one of the end faces (310a, 310b) across the slot (312), which is an integral part of the hollow profile (310) and whose distal end is attached to the opposite edge region, or connecting webs (315a, 315b) extend from both opposite edge regions (312a, 312b) at at least one of the end faces (310a, 310b) across the slot (312), each of which is an integral part of the hollow profile (310) and whose distal ends are connected to each other.