Glow plug

Abstract

The invention relates to a glow plug comprising a housing ( 1 ), a glow element ( 2 ) which extends out of the housing ( 1 ), a supply lead ( 4 ) which is connected to the glow element ( 2 ) via a contact spring ( 5 ) and is enclosed by the housing ( 1 ). According to the invention, the contact spring ( 5 ) is a sleeve having at least one slit ( 6 ) extending transversely to the longitudinal direction of the sleeve.

1 . A glow plug comprising
 a housing ( 1 ),   a glow element ( 2 ) that extends out of the housing ( 1 ),   a supply lead ( 4 ) which is enclosed by the housing ( 1 ) and is connected via a contact spring ( 3 ) to the glow element ( 2 ), characterized in that   the contact spring ( 5 ) is a sleeve having at least one slit ( 6 ) extending transversely to the longitudinal direction of the sleeve.   
     
     
         2 . The glow plug according to  claim 1 , characterized in that the slit ( 6 ) extends perpendicularly to the longitudinal direction of the sleeve. 
     
     
         3 . The glow plug according to one of the preceding claims, characterized in that the slit ( 6 ) has a depth that is more than one-half, preferably more than two-thirds, in particular more than three-fourths of the outer diameter of the sleeve ( 5 ). 
     
     
         4 . The glow plug according to  claim 3 , characterized in that the depth of the slit ( 6 ) is between one-tenth and one-fifth of the outer diameter of the sleeve ( 5 ). 
     
     
         5 . The glow plug according to one of the preceding claims, characterized in that the slit ( 6 ) has a depth that is between one-tenth and one-fourth of the outer diameter of the sleeve ( 5 ). 
     
     
         6 . The glow plug according to one of the preceding claims, characterized in that at least two slits ( 6 ) are provided which are interspaced in the longitudinal direction of the sleeve ( 5 ) and extend in different, preferably opposite directions. 
     
     
         7 . The glow plug according to  claim 6 , characterized in that the distance between adjacent slits ( 6 ), measured from slit edge to slit edge, is at least one-tenth of the outer diameter of the sleeve. 
     
     
         8 . The glow plug according to one of the preceding claims, characterized in that the sleeve is inserted onto the supply lead ( 4 ). 
     
     
         9 . The glow plug according to one of the preceding claims, characterized in that the sleeve is crimped with the supply lead ( 4 ). 
     
     
         10 . The glow plug according to one of the preceding claims, characterized in that the sleeve is inserted onto an intermediate piece ( 7 ) situated between the glow element ( 2 ) and the sleeve.