Patent ID: 6520143
Filing Date: 2003-02-18
Classification: F02M,Y10T

Abstract:
A preinjection valve (1) for controlling the fuel inflow of a fuel injection valve (50), the preinjection valve comprising a valve body (3) in which an inlet conduit (5) and an outlet conduit (7) communicating with the inlet are embodied, the communication between the outlet conduit (7) and the inlet conduit (5) being controlled by a valve assembly having a preinjection valve member (12) which is guided in sealing fashion in the inlet conduit (5) and is acted upon on one side by the fuel pressure of the inlet conduit (5) and is movable counter to a first closing force, wherein, when fuel in the inlet conduit (5) reaches a certain pressure, the preinjection valve member (12) is moved counter to the first closing force through a preinjection stroke (hv) and in the process pumps the fuel, located in a preinjection volume (14) into the outlet conduit (7), and having a deflection valve member (9), which can be acted upon at least indirectly by the fuel pressure in the inlet conduit (5), and which, after the motion of the preinjection valve member (12) through the preinjection stroke (hv), is movable counter to a second closing force in such a way that the communication between the outlet conduit (7) and the inlet conduit (5) is opened, said preinjection valve member (12), after said motion through the preinjection stroke (hv), coming to rest against said deflection valve member (9), and as the fuel pressure increases further in the inlet conduit (5), together with the deflection valve member (9), executes an opening stroke motion counter to the second closing force, or counter to the first and second closing forces, by which opening stroke motion the communication between the outlet conduit (7) and the inlet conduit (5) is opened.