Patent ID: 6820858
Filing Date: 2004-11-23
Classification: F02M

Abstract:
A solenoid valve for controlling an injection valve of an internal combustion engine, comprising:an electromagnet; a movable armature; a control valve member operable to be moved by the movable armature, the control valve member cooperating with a valve seat for opening and closing a fuel discharge channel of a control pressure chamber of the injection valve; and a sliding piece guiding the moveable armature; wherein the sliding piece, the moveable armature and the control valve member are positioned in an armature chamber; wherein the sliding piece subdivides the armature chamber into a pressure relief chamber and a hydraulic damping chamber; wherein the pressure relief chamber is connected to a fuel low-pressure connection; wherein the fuel discharge channel opens into the hydraulic damping chamber; wherein the hydraulic damping chamber is operable to be pressure-relieved toward the pressure relief chamber via at least one connecting channel provided with at least one throttle; wherein a speed of the control valve member is reduced upon a closing of the solenoid valve by a fuel pressure cushion acting upon the control valve member in the hydraulic damping chamber before an impact on the valve seat; wherein the sliding piece includes a sliding sleeve guiding the moveable armature and a flange region forming a partition between the hydraulic damping chamber and the pressure relief chamber, and the flange region stationarily holds the sliding piece in the armature chamber; and wherein the sliding sleeve is positioned away from the flange region in a direction of the valve seat.