Patent ID: 6308689
Filing Date: 2001-10-30
Classification: F02M

Abstract:
An injection valve for controlling fuel flow from an inlet passage to an injection nozzle, the injection valve comprising:a valve body including a valve seat and a bore;a valve element displaceable with respect to the valve body, the valve element sealingly engaging the valve seat and preventing the fuel flow at a closed position of the valve element with respect to the valve body, the valve element including a piston sealingly engaging a wall of the bore in the closed position, a groove confronting the valve body, and a passage having a constriction providing fluid communication between an upstream side of the piston and the groove, the bore having a radially flared portion located at a predetermined length from the groove in the closed position;a control chamber regulating displacement of the valve element with respect to the valve body, displacement less than the predetermined length from the closed position establishing fluid communication between the inlet passage and the injection nozzle through the passage, and displacement in excess of the predetermined length establishing a direct connection between the inlet passage and the injection nozzle; andan actuator controlling pressure in the control chamber.