Seal

Abstract

A seal including a sealing ring ( 1 ) made from an elastomeric material, an intermediate ring ( 2 ) made from a polymeric material, and a supporting ring ( 3 ), the sealing ring ( 1 ), the intermediate ring ( 2 ) and the supporting ring ( 3 ) being arranged concentrically with respect to one another, and the sealing ring ( 1 ) and the supporting ring ( 3 ) being arranged in each case on the sides of the intermediate ring ( 2 ) which face away axially from one another. The sealing ring ( 1 ), the intermediate ring ( 2 ), and the supporting ring ( 3 ) form a pre-assembled unit ( 4 ).

1 . A seal, comprising a sealing ring ( 1 ) made from an elastomeric material, an intermediate ring ( 2 ) made from a polymeric material and a supporting ring ( 3 ), the sealing ring ( 1 ), the intermediate ring ( 2 ) and the supporting ring ( 3 ) being arranged concentrically with respect to one another, and the sealing ring ( 1 ) and the supporting ring ( 3 ) being arranged in each case on the sides of the intermediate ring ( 2 ) which face away axially from one another, characterized in that the sealing ring ( 1 ), the intermediate ring ( 2 ) and the supporting ring ( 3 ) form a pre-assembled unit ( 4 ). 
     
     
         2 . The seal according to  claim 1 , wherein the intermediate ring ( 2 ) is connected in each case in a material-to-material manner to the sealing ring ( 1 ) and the supporting ring ( 3 ). 
     
     
         3 . The seal according to  claim 1 , wherein the sealing ring ( 1 ) is composed of an FKM material. 
     
     
         4 . The seal according to  claim 3 , wherein the FKM material has a Shore A hardness of from 60 to 90. 
     
     
         5 . The seal according to  claim 1 , wherein the intermediate ring ( 2 ) is composed of a PA6.6 material. 
     
     
         6 . The seal according to  claim 1 , wherein that the supporting ring ( 3 ) is composed of a metallic or a sintered material. 
     
     
         7 . The seal according to  claim 1 , wherein the sealing ring ( 1 ) has at least one axial sealing lip ( 5 ) on the side which faces axially away from the intermediate ring ( 2 ). 
     
     
         8 . The seal according to  claim 1 , wherein, on the side which faces axially away from the intermediate ring ( 2 ), the sealing ring ( 1 ) has a radially inner ( 5 . 1 ) and a radially outer axial sealing lip ( 5 . 2 ) which are assigned to one another adjacently at a radial spacing. 
     
     
         9 . The seal according to  claim 1 , wherein, on the side which faces the intermediate ring ( 2 ) axially, the sealing ring ( 1 ) has an annular positioning projection ( 6 ) which is arranged in a congruently designed depression ( 7 ) of the intermediate ring ( 2 ). 
     
     
         10 . The seal according to  claim 1 , wherein, on its side which faces axially away from the sealing ring ( 1 ), the intermediate ring ( 2 ) has a holding claw ( 8 ) which engages in a positively locking manner behind an undercut ( 9 ) of the supporting ring ( 3 ). 
     
     
         11 . The seal according to  claim 1 , wherein the supporting ring ( 3 ) has an annular supporting face ( 10 ) on the end side which faces axially away from the intermediate ring ( 2 ). 
     
     
         12 . The seal according to  claim 1 , wherein those faces of the sealing ring ( 1 ), intermediate ring ( 2 ) and supporting ring ( 3 ) which adjoin one another in an adjacent manner are in bearing contact with one another in a gap-free manner. 
     
     
         13 . Use of the seal according to  claim 1  for sealing an injection valve of an internal combustion engine.