Inflator and vehicle airbag device using the same

Abstract

A disc inflator having gas cooling and mist removal functions, and reduced in weight and in size in a radial direction. An inflator case () has an upper case () at an occupant side and a lower case () at a side opposite an occupant. A tubular holding member () having a separation wall () at a base portion thereof is provided in the inflator case. A gas flow path () is formed at a periphery of the holding member (), and communication holes () communicating with the gas flow path () are formed in the separation wall (). At a peripheral wall portion (B) of the upper case () is formed a gas ejection hole () at a position offset towards an occupant side only by a distance δ from a central position P of a combustion chamber (). Accordingly, a length (L) of a flow path from the starting end of the flow path to the gas ejection hole () increases, enabling effective heat exchange of a high temperature gas and removal of mist (). Thereby, a conventionally used filter may be disposed of.