| abstract |
A gas generator comprising a housing ( 3 ) made of metal and having an initiator shell ( 1 ) and a closure shell ( 2 ), (a) combustion chamber(s) ( 5, 5 a , 5 b ) formed in the housing ( 3 ) and packed with gas generant ( 4 ) that generates high temperature gas by burning, (a) filter member(s) ( 6, 6 a , 6 b ) arranged around the combustion chamber(s) ( 5, 5 a , 5 b ), (an) igniter device(s) ( 7, 7 a , 7 b ) put in the housing ( 3 ) for igniting and burning the gas generant ( 4 ) in the combustion chamber(s) ( 5, 5 a , 5 b ), and a plurality of gas discharge holes ( 8 ) formed at the housing ( 3 ), for discharging gas generated in the combustion chamber(s) ( 5, 5 a , 5 b ), wherein either or both of the initiator shell ( 1 ) and the closure shell ( 2 ) forming the housing ( 3 ) has a head portion ( 14, 10 ) of a semispherical form or an oval semispherical form and a cylindrical portion ( 13, 9 ) of a diameter (D) formed continuously from the head portion ( 14, 10 ), and wherein a ratio H/D between the diameter D of the cylindrical portion ( 13, 9 ) and a distance H between bottoms of the head portions ( 14, 10 ) of the initiator shell ( 1 ) and closure shell ( 2 ) is in the range of 0.4-1.3. |