Actuator

Abstract

The present invention provides an actuator including: a housing having an igniter housing and a cylinder, an igniter accommodated inside the igniter housing and a piston provided inside the cylinder to be slidable, the piston having a rod and an enlarged surface portion formed on one end surface or an outer peripheral surface of the rod, and part of the piston, which includes the other end of the rod, protruding outside the housing before activation, the igniter disposed such that the central axis direction of the igniter and the central axis direction of the rod of the piston are different from each other, wherein, during the activation of the igniter, the piston slides inside the cylinder by pushing the enlarged surface portion by a combustion product generated due to activation of the igniter, and the protruding portion of the piston is retracted inside the housing due to the sliding of the piston.

1 . An actuator comprising: 
 a housing having an igniter housing and a cylinder,    an igniter accommodated inside the igniter housing and a piston provided inside the cylinder to be slidable,    the piston having a rod and an enlarged surface portion formed on one end surface or an outer peripheral surface of the rod, and part of the piston, which includes the other end of the rod, protruding outside the housing before activation,    the igniter disposed such that the central axis direction of the igniter and the central axis direction of the rod of the piston are different from each other,    wherein, during the activation of the igniter, the piston slides inside the cylinder by pushing the enlarged surface portion by a combustion product generated due to activation of the igniter, and the protruding portion of the piston is retracted inside the housing due to the sliding of the piston.    
   
   
       2 . The actuator according to  claim 1 , wherein the combustion product generated when the igniter is activated changes direction by impinging on a collision surface portion provided in the housing, and then pushes the enlarged surface portion.  
   
   
       3 . The actuator according to  claim 2 , wherein the collision surface portion is a wall surface separating the igniter housing from the cylinder.  
   
   
       4 . The actuator according to  claim 2 , wherein the collision surface portion is a wall surface separating the igniter housing from the cylinder, and the wall surface form part of a wall surface of the cylinder.  
   
   
       5 . The actuator according to  claim 2 , wherein the collision surface portion is a cap member disposed to surround an activation portion of the igniter, which is capable of ejecting the combustion products in a direction of the enlarged surface portion.  
   
   
       6 . The actuator according to any one of  claims 1  to  5 , wherein the collision surface portion forms a closed space including the igniter together with other members including the enlarged surface portion.  
   
   
       7 . The actuator according to any of  claims 1  to  5 , wherein the enlarged surface portion of the piston is a portion which extends from the one end surface of the rod or an axial central portion of the rod either unidirectionally outward in a radial direction of the rod or in flange form.  
   
   
       8 . The actuator according to claims  6 , wherein the enlarged surface portion of the piston is a portion which extends from the one end surface of the rod or an axial central portion of the rod either unidirectionally outward in a radial direction of the rod or in flange form.