| 摘要 |
PURPOSE: A ring-type airbag device is provided to properly control the pressure of a main chamber by controlling the size of a vent hole. CONSTITUTION: A ring-type airbag device comprises an inflator(100), an airbag cushion(200), and a vent hole unit(230). The inflator supplies gas to the airbag cushion. The airbag cushion comprises a main chamber(210) and a front chamber(220). The main chamber is inflated toward a passenger. The front chamber is inflated from the inflated front side of the main chamber and covers the inflated front side of the main chamber. The vent hole unit is formed in the side of the main chamber and controls the internal gas pressure of the main chamber.
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