Patent ID: 7108491
Filing Date: 2006-09-19
Classification: F02M,F04B

Abstract:
1. A high pressure pump, in particular for a fuel injection system for internal combustion engines, having at least one piston pump unit ( 2 , 2 ′) which has a piston ( 6 ) guided in a cylinder bore ( 7 ) and delimiting a working chamber ( 8 ), having a crank drive ( 13 ) for driving the piston ( 6 ), having a stroke ring ( 12 ) which is arranged between the crank drive ( 13 ) and the piston ( 6 ) and which is mounted such that it is driven rotatably with respect to the crank drive ( 13 ) but does not rotate and which has a flat sliding bearing surface ( 11 ), on which the piston ( 6 ) is supported with a sliding surface ( 10 ), and having a relief chamber ( 22 ) which is arranged in the region of the sliding surface ( 10 ), is open toward the sliding bearing surface ( 11 ) and which has a pressure connection to the working chamber ( 8 ) via a passage ( 23 ) formed in the piston ( 6 ), characterized in that in the passage ( 23 ) in the piston ( 6 ) there is arranged a pressure transmission element ( 25 , 41 ), which can be pressurized on one side by the medium to be delivered and on the opposite side by a pressure medium in the relief chamber ( 22 ), can be displaced in the direction of the application of pressure under the action of pressure and separates the relief chamber ( 22 ) fluidically from the working chamber ( 8 ).