Patent ID: 6991438
Filing Date: 2006-01-31
Classification: F04B,Y10T

Abstract:
1. A piston pump for producing high-pressure fuel in common-rail fuel injection systems, said pump having a pump housing ( 1 ), a camshaft ( 2 ) mounted rotatably in said pump housing ( 1 ) and having an eccentric cam ( 3 ), for operating at least one pump piston ( 4 , 14 ) supported in a cylinder so as to be movable in an approximately radial direction with respect to the camshaft ( 2 ) to provide a stroke movement, the stroke movement comprising a downstroke ( 5 ′) towards the camshaft ( 2 ) and an opposite upstroke ( 5 ″), and a piston-rod element ( 6 , 16 , 26 , 36 , 46 ) arranged between each pump piston ( 4 , 14 ) and the eccentric cam ( 3 ), the piston rod element ( 6 , 16 , 26 , 36 , 46 ) and the piston ( 4 , 14 ) having opposite contact surfaces for transferring the stroke movement of the eccentric cam ( 3 ) to the pump piston ( 4 , 14 ), the opposite contact surfaces being both convex so as to roll off on one another.