Gas generator

Abstract

A gas generator includes a first cup 10 packed with gas generating agent 14 that generates gas by burning; a second cup E disposed in an inside of the first cup 10 and containing ignition agent; and a holder 9 holding the first cup 10 thereon and also holding a plug B of the second cup E or the second cup thereon. In the gas generator, there is provided a separator 15 which allows the gas generating agent 14 to be confined within the first cup 10 so as to shield the gas generating agent from the second cup E. Further, the separator 15 is so disposed as to cover the second cup E. In addition, seal materials, such as an O-ring 16, is arranged in a moisture inflow path through which moisture or equivalent comes in from outside of the gas generator 18.

1 . A gas generator comprising a first cup packed with gas generating agent that generates gas by burning; a second cup disposed in an inside of the first cup and containing ignition agent; and a holder holding the first cup and a plug for the second cup or holding the first cup and the second cup 
 wherein there is provided a separator which allows the gas generating agent to be confined within the first cup so as to shield the gas generating agent from the second cup.    
     
     
         2 . The gas generator according to  claim 1 , wherein the separator is disposed so as to cover the second cup.  
     
     
         3 . The gas generator according to  claim 1  or  2 , wherein the separator is disposed so that at least a part of an outside surface of the separator can be contacted with an inside face of the first cup.  
     
     
         4 . The gas generator according to  claim 1  or  2 , wherein the separator is set in position within the fist cup by a protrusion or a step provided in the inside surface of the first cup.  
     
     
         5 . The gas generator according to  claim 1  or  2 , wherein the separator is held onto the holder by crimping.  
     
     
         6 . The gas generator according to  claim 1  or  2 , wherein seal materials for sealing a gap between the separator and the first cup is disposed therebetween.  
     
     
         7 . The gas generator according to  claim 1  or  2 , wherein the separator is held on the holder, together with the plug of the second cup, by crimping.  
     
     
         8 . The gas generator according to  claim 1  or  2 , wherein seal materials for sealing a gap between the separator and the holder is disposed therebetween.  
     
     
         9 . The gas generator according to  claim 1  or  2 , wherein 
 the holder is made of metal, and  
 seal materials for sealing a gap between the separator and the holder and a gap between the first cup and the holder are respectively disposed.  
 
     
     
         10 . The gas generator according to  claim 1  or  2 , wherein the holder and the plug are integrally formed.  
     
     
         11 . The gas generator according to  claim 1  or  2 , wherein the separator has a score on itself.  
     
     
         12 . The gas generator according to  claim 1  or  2 , wherein the gas generating agent comprises nitrogen-containing organic compound as fuel component, inorganic compound as oxidizing agent component and at least one additive.  
     
     
         13 . The gas generator according to  claim 12 , wherein the gas generating agent comprises at least one material selected from the group consisting of 5-aminotetrazole, guanidine nitrate and nitroguanidine as the fuel component; and at least one material selected from the group consisting of strontium nitrate, ammonium nitrate, potassium nitrate, ammonium perchlorate and potassium perchlorate as the oxidizing agent component  
     
     
         14 . The gas generator according to  claim 12 , wherein the gas generating agent comprises molybdenum trioxide as the additive.  
     
     
         15 . The gas generator according to  claim 12 , wherein the additive of the gas generating agent comprises at least one material selected from the group consisting of cyamoposis gum, methyl cellulose, carboxymethyl cellulose, water-soluble cellulose ether and polyethylene glycol.  
     
     
         16 . The gas generator according to  claim 12 , wherein the gas generating agent comprises 5-aminotetrazole and guanidine nitrate as the fuel component; strontium nitrate and ammonium perchorate as the oxidizing agent component; molybdenum trioxide and cyamoposis gum as the additive.  
     
     
         17 . The gas generator according to  claim 12 , wherein the gas generating agent comprises 10-30 mass percent of 5-aminotetrazole and 15-35 mass percent of guanidine nitrate as the fuel component; 10-30 mass percent of strontium nitrate and 15-35 mass percent of ammonium perchlorate as the oxidizing agent component; and 1-10 mass percent of molybdenum trioxide and 1-10 mass percent of cyamoposis gum as the additive.  
     
     
         18 . The gas generator according to  claim 1  or  2 , which is used for a seatbelt pretensioner.