Valve control device e.g. for common-rail diesel direct fuel injection system for vehicle combustion engine

摘要

A valve control device includes a housing (1) provided with a hydraulic chamber (2) and two borings (3,4) both discharging into the hydraulic chamber (2). Also included is a primary drive (5) arranged at least partially in the first boring (3) and provided with a piston boring (16) which discharges into the hydraulic chamber (2). A secondary-side lifting element (7) is arranged in the second boring (4) so that the primary drive (5) and the lifting element (7) form a piston chamber (9) within the piston boring (16). The surface of the lifting element (7) pressure-actively exposed to the fluid (6) in the hydraulic chamber (2) in the direction of movement, is smaller than that of the primary drive (5). The pressure active surface of the lifting element acting in the direction of the piston boring (16) in the hydraulic chamber (2) is greater than the surface acting in the direction of the second boring (4). A hydraulic drag is present between the primary drive (5) and the lifting element (7), the latter serving to close the connecting line (27) against the outflow.