Patent ID: 8544771
Filing Date: 2013-10-01
Classification: F02M

Abstract:
1. A fuel injection valve for intermittent injection of fuel into a combustion space of an internal combustion engine, the fuel injection valve comprising: a housing which has a housing body and a nozzle body with an injection valve seat; a high-pressure space which is arranged in the housing and which is connected to a high-pressure fuel inlet and to the injection valve seat; an injection valve member which is arranged longitudinally adjustably in the housing and which cooperates with the injection valve seat; a guide sleeve; an intermediate part; a compression spring which is supported, on the one hand, on the injection valve member and acts upon the injection valve member with a closing force directed toward the injection valve seat, and which is also supported, on the other hand, on the guide sleeve and at the same time presses the guide sleeve sealingly against the intermediate part; a control space delimited with respect to the high-pressure space by the guide sleeve and a control piston of the injection valve member guided in the guide sleeve; and a control device for controlling axial movement of the injection valve member by varying a pressure in the control space; wherein: the control device comprises an intermediate valve, a valve space and an electrically actuated actuator arrangement for connecting the valve space to, and for separating the valve space from, a low-pressure fuel return; the intermediate valve comprises an intermediate valve member, which, in the open position, releases a high-pressure admission into the control space and, in the closing position, cuts off the control space from the high-pressure admission; the intermediate valve member separates the control space from the valve space, with the exception of a permanent connection by a throttle passage; and the intermediate valve member is of mushroom-shaped design, with its head configured to control the high-pressure admission, and which is guided with its shank with a sliding fit in the intermediate part to delimit the valve space and the control space.