Patent ID: 6168096
Filing Date: 2001-01-02
Classification: F02M

Abstract:
A fuel injection device for internal combustion engines comprising: a high-pressure fuel source (1); and a fuel injection valve (9) supplied with fuel from the high-pressure fuel source, said fuel injection valve comprising: a housing; at least one injection port (12); an injection valve member (14) for controlling said at least one injection port (12); an inflow conduit (26) connected with the high-pressure fuel source (1); a movable wall (22) which communicates at least indirectly with the injection valve member (14), the movable wall (22) connected with the inflow conduit (26); a control chamber (24) defined by the movable wall (22); a valve control chamber (30); a piezoelectric actuator (41); a control valve (31) having a control valve member (34), the control valve member (34) further comprising a valve tappet (35) and a valve head (37), the control valve member (34) actuated by the piezoelectric actuator (41), the tappet (35) guided in the housing, the valve head (37) protruding into the valve control chamber (30), the valve head (37) provided with a valve head sealing face (51), the valve head sealing face (51) cooperating with a valve seat (46) to control an outflow of fuel, whereby when the control valve (31 ) is closed, the valve chamber (30) is exposed to a pressure of the high-pressure fuel source (1); an outflow conduit (29) which leads from the control chamber (24) to the valve control chamber (30), the control valve (31) controlling the outflow from the control chamber (24) through the outflow conduit (29); an intermediate valve (56) including an intermediate valve member (57) and a connecting conduit (70), the intermediate valve (56) disposed in a portion of the outflow conduit, the connecting conduit with a first connection cross section provided between the valve control chamber (30) and the control chamber (24), whereby the intermediate valve member (57) is moved by the valve head (37) of the control valve member (34) out of a closing position toward the control chamber (24) counter to a closing force and in this movement a second connection cross section between the valve chamber (30) and the control chamber (24) is opened up.