| 摘要 |
A gas generator ( 30 ) is provided with a metal housing ( 3 ) constituted by an initiator shell ( 1 ) and a closure shell ( 2 ), a combustion chamber ( 5 ) which is formed inside the housing ( 3 ) and into which gas generants ( 4 ) generating a high-temperature gas through combustion are loaded, a filter member ( 6 ) disposed around the combustion chamber ( 5 ), an igniter ( 7 ) mounted into the housing ( 3 ) and igniting and burning the gas generants ( 4 ) inside the combustion chamber ( 5 ) and a plurality of gas discharge openings ( 8 a, 8 b) formed on the housing ( 3 ) and discharging the gas generated in the combustion chamber ( 5 ), and in which either or both of the initiator shell ( 1 ) and the closure shell ( 2 ) constituting the housing ( 3 ) are provided with semi-spherical or semi-oval end plate portions ( 14, 10 ) and cylindrical portions ( 13, 9 ) having a diameter D formed continuously from these end plate portions ( 14, 10 ), H/D or a ratio of the bottom distance H between the end plate portion ( 14 ) of the initiator shell ( 1 ) and that ( 10 ) of the closure shell ( 2 ) to the diameter D of the cylindrical portions ( 13, 9 ) is in the range from 0.4 to 1.3 and (A/At) of a ratio of the total sum (A) of the surface areas of gas generants (4) to the total sum (At) of the opening areas of the gas discharge openings ( 8 a, 8 b) is in excess of 1300 and not more than 2000.
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