Airbag with non-circular vent hole

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/16 (2006.01)

Patent

CA 2259373

This disclosure describes an airbag in which non-circular vent holes replace traditional circular vent holes. Vent holes, in general, provide a geometric asymmetry in the airbag pattern and induce a stress concentration in the geometry. Investigation of airbag deployments has shown that circular vent holes elongate during the early stages of a deployment. This causes stress concentrations at the two circumferential points of the circle as the fabric is strained. Based on this discovery, the inventors determined that a non- circular vent hole, such as an ellipse or rectangle would be advantageous during the early deployment since this non-circular vent hole has assumed a more natural position during this early straining, thereby not inducing additional straining in this region.

Sac gonflable dans lequel des évents non circulaires remplacent les traditionnels évents circulaires. En général, les évents confèrent une géométrie asymétrique à la structure du sac et induisent une concentration de contrainte dans la géométrie. Les recherches menées sur le déploiement des sacs gonflables ont montré que les évents circulaires s'allongent pendant les premières phases de déploiement. Cela provoque des concentrations de contrainte aux deux points circonférentiels du cercle lorsque le matériau est déformé. Sur la base de cette découverte, les inventeurs ont déterminé qu'un évent non circulaire, tel qu'une ellipse ou un rectangle, serait préférable pendant les premiers stades du déploiement étant donné que cet évent non circulaire possède une position plus naturelle pendant la déformation précoce, ce qui lui évite d'induire une déformation supplémentaire dans cette région.

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