Seatbelt Buckle Switch Wire Harness Strain Relief
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Solution Overview
Problem
The buckle switch wire harness in seatbelt restraint systems is vulnerable to wire fracture due to applied tension, which is exacerbated by compact buckle designs that lack adequate strain relief, necessitating a solution to prevent such fractures.
Innovation Solution
A seatbelt buckle apparatus with a strain relief-guide feature that carries and guides the switch wire harness, providing protection between the strain relief-guide feature and the switch housing, integrated into a wire harness guide structure mounted on a projection feature or defined by a cover, to absorb stress and prevent wire cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the buckle design is made compact, then the device size is reduced, but the wire harness becomes more vulnerable to tension and fracture
Solution Approach 1:
A wire harness guide structure is introduced as an intermediary component between the switch wire harness and the buckle housing. This guide structure includes a strain relief feature that acts as a mediator to distribute and reduce the tension forces applied to the wire harness, preventing direct transmission of stress to the wire connections while maintaining the compact buckle design.
Solution Approach 2:
The strain relief feature of the wire harness guide structure provides beforehand cushioning by creating a protective pathway for the wire harness. The guide structure's geometry is designed to absorb and distribute tensile forces before they can reach the wire harness connections, effectively cushioning the wire harness against fracture from everyday use and repetitive movements.
2Reliability
If strain relief is added to protect the wire harness, then the wire fracture risk is reduced, but the device complexity increases
Solution Approach 1:
The wire harness guide structure is merged with existing buckle components such as the projection feature or the cover. By integrating the strain relief functionality into already-present structural elements rather than adding completely separate components, the design provides necessary wire protection while minimizing increases in overall device complexity.
Solution Approach 2:
The wire harness guide structure serves multiple functions: it provides strain relief for the wire harness, guides the wire harness through the buckle housing, and can be integrated with structural features that already serve other purposes in the buckle assembly. This multi-functionality reduces the need for additional dedicated components.
Data Source
AI summary
A seatbelt buckle apparatus for a motor vehicle is provided. The apparatus includes a buckle housing that provides at least part of a structure for selectively coupling a seatbelt latch plate to the apparatus. A switch housing houses at least part of a switch. The switch monitors whether or not the seatbelt latch plate is coupled to the seatbelt buckle apparatus. A switch wire harness is in communication with the switch. A strain relief-guide feature carries and guides a section of the switch wire harness so as to provide strain relief to the switch wire harness when a force is applied to the switch wire harness downstream from the strain relief-guide feature.