Carbon-Deposit Protection System For A Sheathed-Element Glow Plug Having A Gas Conduit For Pressure Measurement

Abstract

A sheathed-element glow plug for an internal combustion engine, made up substantially of a plug housing and a glow element disposed in the plug housing, having a gas conduit for measuring the combustion chamber pressure. A gas-permeable filter element, provided according to the present invention in the gas conduit, prevents the penetration of carbon residues or combustion residues into the interior of the sheathed-element glow plug, or reduces particle entry to a tolerable level.

1 - 5 . (canceled)  
   
   
       6 . A sheathed-element glow plug for an internal combustion engine, comprising: a plug housing and a glow element disposed in the plug housing, having a gas conduit for measuring the combustion chamber pressure, wherein a gas-permeable filter element ( 13 ;  213 ;  313 ;  414 ) is provided in the gas conduit ( 11 ).  
   
   
       7 . The sheathed-element glow plug according to  claim 6 , wherein the gas conduit ( 11 ) includes a first conduit ( 12   a ) that is formed by open space between the glow element ( 3 ) and the cylinder head orifice ( 9 ), and a second conduit ( 12   b ) that is located in a region between the glow element ( 3 ) and the plug housing ( 2 ); and wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is disposed in the first conduit ( 12   a ).  
   
   
       8 . The sheathed-element glow plug according to  claim 6 , wherein the gas conduit ( 11 ) includes a first conduit ( 12   a ) that is formed by open space between the glow element ( 3 ) and the cylinder head orifice ( 9 ), and a second conduit ( 12   b ) that is located in a region between the glow element ( 3 ) and the plug housing ( 2 ); and wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is disposed in the second conduit ( 12   b ).  
   
   
       9 . The sheathed-element glow plug according to  claim 6 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is joined to a sealing element ( 415 ) that ensures a seal between the plug housing ( 2 ) and the sealing seat in the cylinder head orifice ( 9 ).  
   
   
       10 . The sheathed-element glow plug according to  claim 7 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is joined to a sealing element ( 415 ) that ensures a seal between the plug housing ( 2 ) and the sealing seat in the cylinder head orifice ( 9 ).  
   
   
       11 . The sheathed-element glow plug according to  claim 8 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is joined to a sealing element ( 415 ) that ensures a seal between the plug housing ( 2 ) and the sealing seat in the cylinder head orifice ( 9 ).  
   
   
       12 . The sheathed-element glow plug according to  claim 6 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is made of a tight-mesh fabric, porous ceramic, or a metal having very small orifices.  
   
   
       13 . The sheathed-element glow plug according to  claim 7 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is made of a tight-mesh fabric, porous ceramic, or a metal having very small orifices.  
   
   
       14 . The sheathed-element glow plug according to  claim 8 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is made of a tight-mesh fabric, porous ceramic, or a metal having very small orifices.  
   
   
       15 . The sheathed-element glow plug according to  claim 9 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is made of a tight-mesh fabric, porous ceramic, or a metal having very small orifices.  
   
   
       16 . The sheathed-element glow plug according to  claim 10 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is made of a tight-mesh fabric, porous ceramic, or a metal having very small orifices.  
   
   
       17 . The sheathed-element glow plug according to  claim 11 , wherein the filter element ( 13 ;  213 ;  313 ;  414 ) is made of a tight-mesh fabric, porous ceramic, or a metal having very small orifices.