Radialkolbenpumpe zur Kraftstoffhochdruckversorgung

摘要

The invention relates to a radial piston pump for the high-pressure supply of fuel in fuel injection systems of internal combustion engines, especially a common-rail injection system. Said pump comprises a drive shaft (4) mounted inside a pump housing (2) which is configured eccentrically or in the direction of its circumference has several cam-like raised areas, and preferably several pistons (12) which are arranged radially in relation to the drive shaft (4) in each cylinder chamber (18, 74) and can be moved radially back and forth when the drive shaft (4) is rotated in the cylinder chamber (18, 74). Each cylinder chamber (18, 74) is sealed in relation to the drive shaft (4) radially towards the outside by a valve plate (24, 72) comprising a non-return valve (26, 60) on the inlet side and a non-return valve (28) on the high-pressure side. To raise pump output the invention provides for the non-return valve (26, 60) on the inlet side to have a pushrod (30, 66) extending through the valve plate (24, 72) which pushrod on the side facing the cylinder chamber (18, 74) has a valve head (32, 70) which can be applied in a sealing manner against a sealing seat (36) of the valve plate (24, 72). It also provides for a device (38) which pretenses the pushrod (30, 66) in the direction of locking to be arranged on the side of the valve plate (24, 72) which faces away from the cylinder chamber (18, 74).