Abstract: The invention is a gas generator, including: a tubular housing having a gas discharge port, a combustion chamber provided inside the tubular housing and charged with a solid gas generating agent and a flame transmission tube disposed in an axial direction of the tubular housing inside the combustion chamber and provided with a plurality of communication holes that communicate with the combustion chamber, the flame transmission tube having an ignition region provided with an ignition device and a flame transmission region for transmitting flame generated by the actuation of the ignition device, the ignition region and the flame transmission region meeting the following requirements (a) and (b): (a) a mean inner diameter of the ignition region>a mean inner diameter of the flame transmission region; (b) a total opening surface area of the communication holes in the ignition region<a total opening surface area of the communication holes in the flame transmission region.

Abstract: A gas generator that can prevent erroneous operation in which the combustion of a gas generating agent inside one combustion chamber is caused by the combustion of a gas generating agent in the other combustion chamber. Two combustion chambers 30, 50 are separated by a partition wall 35. The partition wall 35 is fixed by discontinuous protrusions 61, 62 formed in a housing 11. Air tightness between two combustion chambers 30, 50 is ensured by two retainers 80, 90.

Abstract: A gas generator for an airbag producing no malfunction is provided. When the first combustion gas generated in the first combustion chamber 30 enters the filter chamber 50, most of the gas is discharged through the gas discharge port 52, however, part of the combustion gas flows into the second through hole 62. This combustion gas flows through the vent hole 76 into the second combustion chamber 40 after changes its flow direction by the gas-flow inhibiting member 80 inside the second cap member 75. At this time, the temperature of the gas is lowered, so that the second gas generating agent 43 is never burnt.

Abstract: A gas generator for an airbag is provided that allows maintaining combustibility as originally designed. An ignition energy generated by an activation of a first igniter 21 flows via a first communication hole 24, a first intermediate chamber 30 and second communication holes 43, into a second combustion chamber 40, to cause a gas generating agent 43 to ignite and burn. The ignition energy flows into the second combustion chamber 40 with making a detour, and therefore, the gas generating agent prevents from broken by the impact and the combustibility thereof is never changed.

Abstract: A cap member adapted is to be disposed in a combustion gas discharge path of an air bag gas generator and allows a combustion gas to pass therethrough while collecting mists contained in the combustion gas. The cap member includes a hollow side wall having a first end thereof open, and defining a plurality of vent holes formed along a longitudinal direction of the hollow side wall, and also a ceiling wall closing a second end of the hollow side wall opposite to the first end.

Abstract: The present invention provides a gas generator, relating to a gas generator for a side air bag or the like, in which the gas purification and cooling efficiency in a filter can be enhanced, the filter is not an obstacle in the release of the gas and the structure is simple. A gas generator for an airbag, in which an inner cylindrical member is stored in a housing, wherein the inner cylindrical member has a second outside diameter portion abutting against the inner peripheral surface of the housing, and a first outside diameter portion that is smaller in outside diameter than the second outside diameter portion, the tip end of the first outside diameter portion side abuts against the closed end portion (one end portion) of the housing, the filter is provided on the outside of the inner cylindrical member in the radial direction of the first outside diameter portion, and the ignition means is provided on the opposite end portion (the other end) from the closed end portion of the housing.