Method of manufacturing perforated pipe for gas generator, as well as gas generator

Abstract

A method of manufacturing a perforated pipe for a gas generator, including a pipe-like member forming step of forming a closed-bottom pipe-like member from a plate-like member by press-forming using a rod-like member and a mold; and a hole punching step of inserting a die into the pipe-like member in place of the rod-like member, the die including one or more through holes in a direction intersecting an axial direction thereof, and punching through the pipe-like member formed in the pipe-like member forming step with a punching member aligned with a position of each through hole to form one or more pairs of opposed punch holes; wherein a distance between the paired punch holes is any value selected from 3 mm to 10 mm.

1 . A method of manufacturing a perforated pipe for a gas generator, comprising:
 a pipe-like member forming step of forming a closed-bottom pipe-like member from a plate-like member by press-forming using a rod-like member and a mold, the mold having an inner shape substantially similar to an outer shape of the rod-like member; and   subsequently to the pipe-like member forming step, a hole punching step of:   inserting a die into the pipe-like member in place of the rod-like member, the die having a shape substantially similar to the outer shape of the rod-like member, the die including one or more through holes in a direction intersecting an axial direction thereof; and punching through the pipe-like member formed in the pipe-like member forming step with a punching member aligned with a position of each through hole to form one or more pairs of opposed punch holes, wherein   a distance between the paired punch holes is any value selected from 3 mm to 10 mm.   
     
     
         2 . A method of manufacturing a perforated pipe for a gas generator, comprising:
 a pipe-like member forming step of forming a closed-bottom pipe-like member from a plate-like member by press-forming using a rod-like member and a mold, the rod-like member including one or more through holes in a direction intersecting an axial direction thereof, the mold having an inner shape substantially similar to an outer shape of the rod-like member; and   subsequently to the pipe-like member forming step, a hole punching step of punching through the pipe-like member formed in the pipe-like member forming step with a punching member aligned with a position of each through hole to form one or more pairs of opposed punch holes, wherein   a distance between the paired punch holes is any value selected from 3 mm to 10 mm.   
     
     
         3 . The method of manufacturing a perforated pipe for a gas generator according to  claim 1 , further comprising: after the hole punching step, rotating the pipe-like member by a predetermined angle with respect to a central axis of the rod-like member; and punching through the pipe-like member with the punching member aligned with the position of each through hole to further form one or more pairs of punch holes. 
     
     
         4 . A gas generator comprising:
 an elongated cylindrical metal housing that has a closed bottom and a gas discharge port, and includes a combustion chamber accommodating a gas generating agent;   a metal holder that is inserted into an open end of the housing so as to be attached to the housing, and includes a hollow opening part extending in a direction parallel to an axial direction of the housing;   an igniter that includes an ignition part accommodating an ignition charge, and is placed in the hollow opening part such that the ignition part is positioned on the combustion chamber side;   the combustion chamber that is provided in the housing, and accommodates the gas generating agent ignited and combusted by the igniter; and   a perforated pipe for a gas generator that covers an entrance of a gas discharge path extending from the combustion chamber to the gas discharge port, inside of the combustion chamber, wherein   the perforated pipe for a gas generator is manufactured through the method of manufacturing a perforated pipe for a gas generator according to  claim 1 .   
     
     
         5 . The method of manufacturing a perforated pipe for a gas generator according to  claim 2 , further comprising: after the hole punching step, rotating the pipe-like member by a predetermined angle with respect to a central axis of the rod-like member; and punching through the pipe-like member with the punching member aligned with the position of each through hole to further form one or more pairs of punch holes. 
     
     
         6 . A gas generator comprising:
 an elongated cylindrical metal housing that has a closed bottom and a gas discharge port, and includes a combustion chamber accommodating a gas generating agent;   a metal holder that is inserted into an open end of the housing so as to be attached to the housing, and includes a hollow opening part extending in a direction parallel to an axial direction of the housing;   an igniter that includes an ignition part accommodating an ignition charge, and is placed in the hollow opening part such that the ignition part is positioned on the combustion chamber side;   the combustion chamber that is provided in the housing, and accommodates the gas generating agent ignited and combusted by the igniter; and   a perforated pipe for a gas generator that covers an entrance of a gas discharge path extending from the combustion chamber to the gas discharge port, inside of the combustion chamber, wherein   the perforated pipe for a gas generator is manufactured through the method of manufacturing a perforated pipe for a gas generator according to  claim 2 .   
     
     
         7 . A gas generator comprising:
 an elongated cylindrical metal housing that has a closed bottom and a gas discharge port, and includes a combustion chamber accommodating a gas generating agent;   a metal holder that is inserted into an open end of the housing so as to be attached to the housing, and includes a hollow opening part extending in a direction parallel to an axial direction of the housing;   an igniter that includes an ignition part accommodating an ignition charge, and is placed in the hollow opening part such that the ignition part is positioned on the combustion chamber side;   the combustion chamber that is provided in the housing, and accommodates the gas generating agent ignited and combusted by the igniter; and   a perforated pipe for a gas generator that covers an entrance of a gas discharge path extending from the combustion chamber to the gas discharge port, inside of the combustion chamber, wherein   the perforated pipe for a gas generator is manufactured through the method of manufacturing a perforated pipe for a gas generator according to  claim 3 .   
     
     
         8 . A gas generator comprising:
 an elongated cylindrical metal housing that has a closed bottom and a gas discharge port, and includes a combustion chamber accommodating a gas generating agent;   a metal holder that is inserted into an open end of the housing so as to be attached to the housing, and includes a hollow opening part extending in a direction parallel to an axial direction of the housing;   an igniter that includes an ignition part accommodating an ignition charge, and is placed in the hollow opening part such that the ignition part is positioned on the combustion chamber side;   the combustion chamber that is provided in the housing, and accommodates the gas generating agent ignited and combusted by the igniter; and   a perforated pipe for a gas generator that covers an entrance of a gas discharge path extending from the combustion chamber to the gas discharge port, inside of the combustion chamber, wherein   the perforated pipe for a gas generator is manufactured through the method of manufacturing a perforated pipe for a gas generator according to  claim 5 .