Airbag Mounting Bracket Torque Stability
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Solution Overview
Problem
Existing airbag devices face challenges in obtaining a feeling of contact when fastening bolts and maintaining torque due to the mounting tab serving as a cushion, leading to complex mounting and potential detachment during storage and conveyance.
Innovation Solution
The airbag device incorporates a mounting bracket with inner and outer plates and an annular member, where the bolt penetrates through the inner hole, annular member, and outer plate, using a toothed washer for temporary attachment, which restricts the distance between plates and prevents cushioning, allowing for secure and easy mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mounting tab is sandwiched between two metal plates and fastened with a bolt, then the mounting structure is secure, but the mounting tab serves as a cushion making it difficult to obtain a feeling of contact when the bolt is fastened
Solution Approach 1:
A rigid block is introduced as an intermediary component between the mounting tab and the metal plates. This rigid block prevents the mounting tab from compressing and serving as a cushion, thereby transmitting the fastening force directly and providing a clear feeling of contact during bolt fastening, while still maintaining secure mounting through the metal plates and bolt assembly
2Stability of the object's composition
If the mounting tab is compressed between metal plates for a long time, then the mounting structure is stable, but the torque of the bolt may decrease due to thermal expansion and deterioration of the mounting tab
Solution Approach 1:
The rigid block serves as a mediator that prevents direct compression of the mounting tab between the metal plates. By eliminating the compression relationship, the mounting tab does not undergo thermal expansion or deterioration from prolonged compression, thereby maintaining bolt torque reliability while still achieving stable mounting through the rigid block's structural support
Solution Approach 2:
The rigid block provides beforehand support to prevent excessive compression of the mounting tab. This prior protective measure ensures that the mounting tab is not subjected to damaging compressive forces that would lead to thermal expansion and deterioration, thereby preserving bolt torque over time
3Reliability
If the mounting structure uses multiple metal plates and fastening components, then the attachment is secure, but the mounting process becomes complex
Solution Approach 1:
The rigid block is integrated with one of the metal plates or the mounting tab assembly, combining multiple functions into a single component. This merging reduces the number of separate parts and simplifies the mounting process while maintaining the security provided by the multi-component fastening system
Data Source
AI summary
In an airbag device to be mounted to a vehicle-body side wall, an airbag and a mounting bracket are temporarily, but securely, attached to each other, so that mounting of the airbag to the vehicle-body side wall can be easily performed.A bolt (50) is inserted through a plurality of mounting tabs (11) provided on an airbag (10) of an airbag device (1), a mounting bracket (40) having inner and outer plates (41) and (42), and an annular member (44) provided in the inner plate (41). In this state, a toothed washer (70) is fitted and temporarily attached to the bolt (50). The annular member (44) is fastened by screwing the bolt (50) into a nut (55) attached to the vehicle-body side wall (15) when the airbag (10) is mounted to a vehicle-body side wall (15).