Control Valve

Abstract

A control valve ( 101 ) for the control of a hydraulic device for changing the control times of gas exchange valves of an internal combustion engine is provided, The control valve ( 101 ) is located in a valve housing ( 106 ) and an elastic seal element ( 124 ) is provided at an axial end thereof. The elastic seal element ( 124 ) secures function by prevention of leakage flow between pressure medium channels ( 113 ) and the pressure medium channels ( 113 ) and the drain connector (T). Also provided is an elastic seal ring ( 124 ) provided as a sealing ring with two conical regions ( 129, 131 ).

1 . Sealing element comprising a sealing ring for sealing an axial end of a control valve of a device for changing control times of gas-exchange valves, including an inner casing surface and an outer casing surface, the inner casing surface and the outer casing surface are provided with a conical area on each of ring edges thereof. 
   
   
       2 . Sealing element according to  claim 1 , wherein the two conical areas are formed on the ring edges of the sealing element offset relative to each other in an axial direction. 
   
   
       3 . Control valve for controlling a supply and discharge of pressure medium to and from a device for changing control times of an internal combustion engine with
 an essentially cylindrical valve housing, on which pressure medium connections are formed and   with an axially displaceable control piston arranged within the valve housing,   wherein a connection between the pressure medium connections can be established or separated as a function of a position of the control piston,   wherein the valve housing is arranged within a valve receptacle, and   wherein an insertion depth of the valve housing into the valve receptacle is limited by an axial stop formed in the valve receptacle,   the axial stop is formed as a circular or circular ring-shaped wall,   which extends radially inwards starting from an inner casing surface of the valve receptacle,   and a sealing element is arranged between the valve housing and the axial stop of the valve receptacle.   
   
   
       4 . Control valve according to  claim 3 , wherein an axial stop-side end of the valve housing is formed with an area reduced in outer diameter, wherein the sealing element is arranged at least partially in the area reduced in outer diameter. 
   
   
       5 . Control valve according to  claim 3 , wherein the sealing element is constructed as a sealing ring with an outer casing surface and an inner casing surface. 
   
   
       6 . Control valve according to  claim 3 , wherein the sealing element is comprised of an elastomer. 
   
   
       7 . Control valve according to  claim 3 , wherein the elastomer is a fluoro rubber or an acrylonitrile butadiene rubber. 
   
   
       8 . Control valve according to  claim 3 , wherein the valve receptacle is assembled from a first and a second bore, wherein the bores are constructed in different surrounding constructions, arranged at least approximately coaxially and located adjacent to each other. 
   
   
       9 . Control valve according to  claim 8 , wherein the axial stop is embodied as a boundary of the two surrounding constructions. 
   
   
       10 . Control valve according to  claim 8 , wherein the axial stop is formed in the second bore in a direction of insertion of the control valve. 
   
   
       11 . Control valve according to  claim 8 , wherein the axial stop is arranged and the sealing element is constructed so that the sealing element contacts the valve receptacle at a boundary of the two surrounding constructions. 
   
   
       12 . Control valve according to  claim 4 , wherein a transition area of the valve housing to the diameter-reduced area has an at least partially conical construction and the sealing element is provided on an inner casing surface thereof with a first conical area that is adapted to the transition area of the valve housing. 
   
   
       13 . Control valve according to  claim 5 , wherein the outer casing surface of the sealing element is provided on an end contacting the axial stop with a second conical area, so that an annular hollow space is produced between the sealing element and the axial stop.