Seat Belt Retractor Control Geometry for Mis-Synchronized Lock Release
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Solution Overview
Problem
Existing belt retractors face issues with mis-synchronized locking states due to factors like high temperatures, dynamic activations, and manufacturing play, leading to jamming and loss of functionality in reeling and unwinding operations.
Innovation Solution
The belt retractor incorporates a control geometry with additional extension and retraction areas to accommodate over-rotation of the clutch and locking disks, allowing for reliable transition from mis-synchronized to synchronized states, ensuring continuous operation by providing separate areas for the control element's movement beyond predefined degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control geometry is designed with only first extension area and first retraction area for predefined rotation degree, then the device structure is simple, but the belt retractor jams in mis-synchronized states caused by over-rotation beyond predefined degree
Solution Approach 1:
The control geometry is segmented into four distinct areas: first extension area, first retraction area, second extension area, and second retraction area. This segmentation allows the control element to have dedicated spaces for both synchronized and mis-synchronized states, preventing jamming by providing appropriate reception zones for the control element regardless of the rotation degree between clutch disk and locking disk.
2Reliability
If the control geometry includes second extension area and second retraction area for over-rotation accommodation, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The control geometry serves multiple functions through its four-area design: it controls the locking element in synchronized states (first extension and retraction areas) and accommodates mis-synchronized states (second extension and retraction areas). This multi-functionality ensures continuous operation under various conditions including over-rotation, while the integrated design maintains manufacturing feasibility.
3Adaptability or versatility
If the clutch disk and locking disk are allowed to rotate against each other beyond predefined degree, then the adaptability to mis-synchronized states is improved, but the precision of synchronized locking is reduced
Solution Approach 1:
The system dynamically adapts to different operational states through the control element's movement across four distinct areas. In synchronized states, the control element resides in the first extension and retraction areas, ensuring precise locking. When mis-synchronization occurs due to over-rotation, the control element transitions to the second extension and retraction areas, allowing the system to accommodate the deviation without jamming while maintaining functional integrity.
Data Source
AI summary
The invention describes a belt retractor (10) for a vehicle including a locking disk (22) on which a locking element (24) is supported. In an extended position, the locking element (24) engages in locking teeth (28) on a frame (12) of the belt retractor (10). In a retracted position, the locking element (24) releases the locking teeth (28). There is further provided a clutch disk (38) which is motion-coupled with the locking element (24) via a control geometry (40) and a control element (36). The control geometry (40) comprises a first retraction area as well as a second retraction area for receiving the control element (36) in an at least partially retracted position of the locking element (36) and a first extension area as well as a second extension area for receiving the control element (36) in the extended position of the locking element (24). The invention further presents a method for releasing a mis-synchronized locking position of a belt retractor (10).