Seal, in particular for caseless ammunition

Abstract

A seal ( 10 ) which seals a gap ( 12 ) which is provided between a stationary first element ( 14 ), and a moving second element ( 16 ), in particular for caseless ammunition, with the second element ( 16 ) having a cylindrical sealing ring seat ( 22 ) in which a sealing ring ( 24 ) is provided. The sealing ring seat ( 22 ) has a main section ( 26 ) and secondary section ( 28 ) with a reduced diameter. The sealing ring ( 24 ) has a main body ( 30 ) and an initial seal ( 32 ). The sealing ring seat main body ( 26 ) has an internal diameter ( 34 ) which is larger than the external diameter ( 36 ) of the sealing ring main body ( 30 ) by at least an amount to compensate for thermal expansion. The sealing ring initial seal ( 32 ) is forced against the cylindrical sealing ring seat secondary section ( 28 ) with a push fit to produce a seal.

1 . A seal for sealing the gap ( 12 ) which is provided between a stationary, rigid first element ( 14 ), such as a weapon barrel and a moving second element ( 16 ), such as a cartridge chamber for caseless ammunition, with the second element ( 16 ) or the first element ( 14 ) selectively having a cylindrical sealing ring seat ( 22 ) in which a sealing ring ( 24 ) is provided, wherein the sealing ring seat ( 22 ) has a cylindrical sealing ring seat main section ( 26 ) and, at a front end thereof facing away from the first element ( 14 ), a cylindrical sealing ring seat secondary section ( 28 ) with a reduced diameter, and in that the sealing ring ( 24 ) has a sealing ring main body ( 30 ) and an initial seal ( 32 ), which is provided at its front end facing away from the first element ( 14 ), with the sealing ring seat main section ( 26 ) having an internal diameter ( 34 ) which is larger than the external diameter ( 36 ) of the sealing ring main body ( 30 ) by at least an amount to compensate for thermal expansion, and with the sealing ring initial seal ( 32 ) being forced against the sealing ring seat secondary section ( 28 ) in a mechanically prestressed manner to produce a seal.  
   
   
       2 . A seal according to  claim 1 , wherein the sealing ring seat ( 22 ) has a stepped internal contour and the sealing ring ( 24 ) has an external contour which is stepped in a manner matched thereto, the sealing ring main body ( 30 ) being provided, at a rear end thereof facing the first element ( 14 ), with a sealing ring collar ( 40 ) which has a sealing ring surface ( 42 ) on the rear end.  
   
   
       3 . A seal according to  claim 2 , wherein the sealing ring ( 24 ) has an internal contour ( 44 ) which tapers with a small coning angle ( 46 ) from the sealing ring initial seal ( 32 ) to the sealing ring collar ( 40 ) at the rear end.  
   
   
       4 . A seal according to  claim 1 , wherein the sealing ring initial seal ( 32 ) is in the form of an annular sealing lip.  
   
   
       5 . A seal according to  claim 1 , wherein the sealing ring initial seal ( 32 ) is supported with a push fit against the sealing ring seat secondary section ( 28 ).  
   
   
       6 . A seal according to  claim 1 , wherein said sealing ring ( 24 ) has the dimension ratios of the sealing lip ( 32 ) and sealing ring main body ( 30 ) in the range of 1:30 or more.