Method for sealing a projectile and ammunition containing the projectile

Abstract

A method seals a projectile having a wall against propellant charge gas pressure occurring during firing of the projectile. A propellant charge is ignited and the projectile is acted upon from the outside by the propellant charge gas pressure. In order reliably to seal the projectile, during the firing thereof, against penetration by propellant charge gas from the outside into the interior thereof, it is proposed that a contact connection of an electrical interface arranged in a channel in the wall is moved in the channel by the propellant charge gas pressure and presses a seal into a sealing seat.

1 . A method for sealing a projectile having a wall for use against propellant charge gas pressure occurring during firing of the projectile, which comprises the steps of:
 igniting a propellant charge, the projectile is acted upon from outside by the propellant charge gas pressure; and   moving a pressure unit of an electrical interface disposed in a channel in the wall, in the channel, due to the propellant charge gas pressure and presses a seal into a sealing seat.   
     
     
         2 . The method according to  claim 1 , wherein the pressure unit is a contact connection of the electrical interface. 
     
     
         3 . The method according to  claim 1 , wherein when the propellant charge gas pressure occurs, the pressure unit presses a sealing section of the seal, which is oriented perpendicular to an axis of the channel, parallel to the axis of the channel into the sealing seat. 
     
     
         4 . The method according to  claim 1 , wherein when the propellant charge gas pressure occurs, the pressure unit presses a sealing section of the seal, which is oriented parallel to an axis of the channel, radially between the pressure unit and the wall such that the sealing section seals the channel against penetration by propellant charge gas. 
     
     
         5 . The method according to  claim 1 , which further comprises:
 inserting the pressure unit in a roughly pressed manner with the seal into the channel and, when the propellant charge gas pressure occurs, the pressure unit, by means of movement thereof, presses the seal more strongly radially into the channel than during rough pressing, and therefore the seal seals the channel against penetration by propellant charge gas.   
     
     
         6 . The method according to  claim 1 , wherein when the propellant charge gas pressure occurs, the pressure unit presses in a first sealing section, disposed further on an inside and is oriented perpendicular to an axis of the channel, temporally before a second sealing section disposed further on an outside and is oriented parallel to the axis of the channel. 
     
     
         7 . Ammunition, comprising:
 a propellant charge;   a projectile having a wall separating an interior space of said projectile from an exterior space around said projectile, said wall having a channel formed therein; and   an electrical interface having a seal disposed in said channel in said wall, said electrical interface further having a pressure unit mounted in said channel so as to be movable relative to said wall in such a manner that said pressure unit, during a movement of said pressure unit caused by propellant charge gas pressure arising during firing of said projectile, presses said seal against said wall.   
     
     
         8 . The ammunition according to  claim 7 , wherein said seal has a cup shape with a first sealing section disposed further on an inside and is oriented perpendicular to an axis of said channel and a second sealing section disposed further on an outside and is oriented parallel to said axis of said channel. 
     
     
         9 . The ammunition according to  claim 7 , wherein said seal has a sealing section which is oriented parallel to an axis of said channel and a height of said sealing section is at maximum 20 times a thickness of said sealing section. 
     
     
         10 . The ammunition according to  claim 7 , wherein said seal has a sealing section which is oriented parallel to an axis of said channel and a thickness of said sealing section is at least 10% of a thickness of that section of said pressure unit which is surrounded by said sealing section. 
     
     
         11 . The ammunition according to  claim 7 , wherein:
 said channel has a step-shaped tapered portion forming a sealing seat; and   said pressure unit has a thickened portion forming a shoulder and by which a sealing section of said seal oriented perpendicular to an axis of said channel can be pressed against said sealing seat.   
     
     
         12 . The ammunition according to  claim 7 , wherein said pressure unit has a pressure element, by means of said pressure element a sealing section of said seal oriented parallel to an axis of said channel can be pressed radially between said pressure unit and said wall during the movement of said pressure unit, and therefore said sealing section seals said channel against penetration by propellant charge gas. 
     
     
         13 . The ammunition according to  claim 12 , wherein said pressure element is spaced apart radially from said wall by a gap. 
     
     
         14 . The ammunition according to  claim 7 , wherein said pressure unit has a pressure element which is spaced apart from a first sealing section of said seal, which is disposed further on an outside and is oriented parallel to an axis of said channel, by a gap such that a second sealing section of said seal, which is disposed further on an inside and is oriented perpendicular to the axis of said channel, can be pressed in before said first sealing section which is disposed further on the outside and is oriented parallel to the axis of said channel. 
     
     
         15 . The ammunition according to  claim 7 , wherein said seal is composed of a plastic which electrically insulates said pressure unit from said wall. 
     
     
         16 . The ammunition according to  claim 7 , wherein said seal has a sealing section which is oriented parallel to an axis of said channel and a height of said sealing section is at maximum 8 times a thickness of said sealing section. 
     
     
         17 . The ammunition according to  claim 7 , wherein said seal has a sealing section which is oriented parallel to an axis of said channel and a thickness of said sealing section is at least 15% of a thickness of that section of said pressure unit which is surrounded by said sealing section.