Patent ID: 6540161
Filing Date: 2003-04-01
Classification: F02M

Abstract:
In a fuel injection valve for internal combustion engines, having a valve body (1), in which a bore (11) formed as a blind bore is embodied so that toward a combustion chamber it changes into a slide portion or bore (111), on a wall of which at least one injection opening (16, 17) is disposed, and having a pistonlike valve member (10), which is guided in a region of the bore (11) remote from the combustion chamber and is axially movable counter to the force of at least one closing spring (33) and which on its end toward the combustion chamber changes into a closing head (13) that is guided in the slide portion or bore (111) of the bore (11) and that closes the injection opening (16, 17), the injection opening (16, 17) being openable entirely or in part by an inward-oriented opening stroke motion of the valve member (10), as a result of which an injection cross section changes as a function of an opening stroke of the valve member (10), which valve member (10), for limiting its opening stroke motion to a maximum opening stroke (h) comes to rest on a stop, and on which valve member a pressure shoulder (24) acting in an opening direction is embodied, the improvement comprising, in a region of the valve body (1) remote from the combustion chamber, a control piston (43) is disposed at least approximately coaxially to the valve member (10), the control piston being guided axially movably in a control bore (57) embodied in the valve body (1) and defining a control chamber (56), and fuel under pressure can be delivered to the control chamber (56), by means of which the control piston (43) can be moved, counter to a force of a restoring spring (53), from a first stroke position toward the valve member (10) into a second stroke position, as a result of which the control piston (43) acts as a stop (44) for the valve member (10) and limits the opening stroke motion of the valve member (10) to a partial stroke (hT) that is less than the maximum stroke (h).