Patent ID: 7398996
Filing Date: 2008-07-15
Classification: B60R

Abstract:
1. A gas generator comprising: a metal housing constituted by an initiator shell and a closure shell, a combustion chamber which is formed inside the housing and into which gas generants generating a high-temperature gas through combustion are loaded, a filter member disposed around the combustion chamber, an igniter mounted into the housing and igniting and burning the gas generants inside the combustion chamber, and a plurality of gas discharge openings formed on the housing and discharging the gas generated in the combustion chamber, wherein either or both of the initiator shell and the closure shell constituting the housing are provided with semi-spherical or semi-oval end plate portions and cylindrical portions having a diameter D continuously formed from said end plate portions, a ratio H/D of the bottom distance H between the end plate portion of the initiator shell and that of the closure shell to the diameter D of the cylindrical portions is in the range from 0.4 to 1.3, and a ratio A/At of a total sum (A) of surface areas of gas generants to the total sum (At) of the opening areas of the gas discharge openings is in excess of 1300 and not more than 2000, wherein the gas discharge openings have first and second opening diameters (D wherein a relation of a distance d between gas discharge openings in an axial direction of the housing, the first opening diameter (D