Webbing Take-Up Device Frame Deformation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing webbing take-up devices for vehicle seat belts often deform when the leg plates are pulled towards the back plate, leading to displacement and potential failure in securing the seat belt effectively during rapid vehicle deceleration.
Innovation Solution
A webbing take-up device with a frame design that includes a spool between leg plates, where the webbing is anchored to the spool and an interfering member is provided to restrict deformation by interfering with the back plate, preventing the leg plates from displacing towards the back plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the webbing is pulled out from the spool during rapid vehicle deceleration, then the seat belt can restrain the occupant, but the frame deforms causing the leg plates to displace towards the back plate side
Solution Approach 1:
The interfering member is pre-installed on the leg plates to create preliminary resistance against the deformation force. When the webbing is pulled during rapid deceleration, the interfering member immediately interferes with the back plate to prevent the leg plates from displacing towards the back plate side, thereby maintaining frame structural stability while allowing the seat belt to function
2Loss of energy
If the leg plates are allowed to displace towards the back plate side, then the frame can absorb impact energy, but the seat belt securing effectiveness is compromised
Solution Approach 1:
The interfering member creates preliminary anti-action against the deformation that would otherwise absorb impact energy. By preventing the leg plates from displacing towards the back plate side, it ensures that the frame maintains its structural configuration and the seat belt remains effectively secured during impact events
3Stability of the object's composition
If the frame is made more rigid to prevent deformation, then the leg plates remain stable, but the device complexity increases
Solution Approach 1:
The frame is segmented into functional components: the back plate, the pair of leg plates, and the interfering member. This segmentation allows each component to perform its specific function - the interfering member specifically addresses the deformation issue without requiring complete redesign of the entire frame structure, thereby maintaining relatively simple overall device complexity while achieving improved stability
Data Source
AI summary
A webbing take-up device is provided capable of preventing or suppressing a frame from deforming such that one of leg-plates or a back-plate displaces towards the other. A face on the center of curvature side of a curved portion of a front back plate section configuring the frame and a one width direction edge namely an upper edge of a bar support face each other along the up-low direction. When the front edge sides of leg-plates are displaced to rise due to a webbing being pulled, the one width direction edge of the bar support interferes with a front end of the front back plate section to prevent or suppress the front edge sides of the leg-plates from rising further. Deformation of the frame caused by the front edge sides of the leg-plates to rise can accordingly be prevented or suppressed.