A high pressure pump piston, in particular for injection diesel fuel for diesel engines.

摘要

P a) a piston pump, a high pressure (& br / b), characterized in that the side of the drive, with respect to the drilling of the supply / evacuation (4a, 4b), it is provided a second annular cavity (13) in the wall of cylinder (7), this second cavity having an axial length (n) is equal to about 0,2 - 1,0 times the diameter of the piston (d), and which is separated from the bore of the supply / evacuation (4a, 4b) by a second guide surface (11b), said guide surface having an axial length of the order of from 0,05 to 0,5 d and the two annular cavities (8, 13) have a depth of 0,1 - 3 mm relative to the guide surfaces (11a, 11b). br / c) the invention relates to a piston pump high pressure. / p