Automobile Interior Trim Rupture Design for Airbag Deployment
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Solution Overview
Problem
Conventional automobile interior trims do not easily rupture to allow stable deployment of side airbags due to the absence of a base point of rupture, inhibiting the proper inflation and deployment of the airbag.
Innovation Solution
An automobile interior trim with a resin core member and a surface member bonded to its front surface, featuring reinforcement ribs with recesses at the upper end for rupture points and a slit at the terminal part of the surface member adjacent to the rupture point, allowing the resin core member to rupture and facilitating airbag deployment without inhibiting the surface member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface member is bonded to the front surface of the resin core member without any rupture-inducing structure, then the surface member provides aesthetic coverage and protection, but the terminal part of the resin core member cannot rupture easily, causing unstable side airbag deployment
Solution Approach 1:
A recess is formed at the upper end surface of the reinforcement rib before the side airbag deployment occurs. This preliminary structural feature serves as a predetermined base point of rupture, guiding the resin core member to rupture at the intended location when the side airbag inflates, thereby ensuring stable and reliable airbag deployment while maintaining the overall strength of the core member during normal use
Solution Approach 2:
The recess is localized at the upper end surface of the reinforcement rib, creating a specific weak point only at that location. This local structural modification allows the terminal part of the resin core member to rupture easily at the recess while the rest of the core member maintains its full strength, resolving the contradiction between overall strength and localized rupture capability
2Reliability
If the terminal part of the resin core member is designed to rupture easily by providing a recess, then stable side airbag deployment is achieved, but the surface member may obstruct the rupture process and airbag deployment
Solution Approach 1:
The surface member is segmented by forming a slit at its terminal part, which corresponds to the location of the recess in the resin core member. This segmentation allows the surface member to be divided into separate sections that can move independently during rupture, preventing the intact surface member from obstructing the rupture process and enabling smooth side airbag deployment
Solution Approach 2:
The slit in the surface member is formed in advance at the terminal part, corresponding to the recess location. This preliminary preparation ensures that when the resin core member ruptures at the recess, the surface member is already predisposed to separate along the slit, eliminating obstruction and facilitating reliable airbag deployment
Data Source
AI summary
An automobile interior trim includes: a resin core member formed to have a predetermined shape; a surface member bonded to a front surface of the resin core member; a plurality of reinforcement ribs provided at a back surface of the resin core member in a width direction of the resin core member; and a recess formed at an upper end surface of each of the reinforcement ribs as means for setting a terminal part of the resin core member as a base point of rupture so that, when a side airbag deploys on the back surface side of the resin core member, the terminal part of the resin core member ruptures by force of the deployment. A slit is formed at the terminal part of the surface member adjacent to the base point of the rupture of the resin core member.