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US 2002/0157645 A1Published application
Common rail injector
OwnerFriedrich Boeckinginventor
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OwnerFriedrich Boeckinginventor
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The invention relates to a common rail injector for injecting fuel in a common rail injection system of an internal combustion engine, which has an injector housing (1) with a fuel inlet (24) that communicates with a central high-pressure fuel reservoir outside the injector housing (1), and which can be made to communicate with a high-pressure conduit (25) inside the injector housing (1), from which conduit fuel subjected to high pressure is injected into the combustion chamber of the engine when a control valve member (8), movable axially back and forth in a longitudinal bore (4) of the injector (1) lifts, with a first valve sealing face (9), from a first valve seat (10) as a function of the pressure in a control chamber (29). In order to furnish a rapid respond common rail injector that at least partly functions in force equilibrium, the control chamber (29) is formed by a substantially cylindrical recess (12), provided in the end (11) of the control valve member (8) remote from the combustion chamber, the diameter (d2) of which recess is greater than the diameter (d1) of the first valve seat (10), and which recess at least partly surrounds a guide peg (13) that is stationary relative to the injector housing (1).
A common rail injector for injecting fuel in a common rail injection system of an internal combustion engine, which has an injector housing (1) with a fuel inlet (24) that communicates with a central high-pressure fuel reservoir outside the injector housing (1), and which can be made to communicate with a high-pressure conduit (25) inside the injector housing (1), from which conduit fuel subjected to high pressure is injected into the combustion chamber of the engine when a control valve member (8), movable axially back and forth in a longitudinal bore (4) of the injector (1) lifts, with a first valve sealing face (9), from a first valve seat (10) as a function of the pressure in a control chamber (29), characterized in that the control chamber (29) is formed by a substantially cylindrical recess (12), provided in the end (11) of the control valve member (8) remote from the combustion chamber, the diameter (d2) of which recess is greater than the diameter (d1) of the first valve seat (10), and which recess at least partly surrounds a guide peg (13) that is stationary relative to the injector housing (1).
The common rail injector of one of the foregoing claims, characterized in that a prestressed control valve spring (31) is disposed outside the guide peg (13), between the control valve member (8) and the valve housing (1).
The common rail injector of one of the foregoing claims, characterized in that the control valve member (8) has a second valve sealing face (19), which cooperates with a second valve seat (20) in order to open and close a communication between the high-pressure conduit (25) and a second relief conduit (26) that communicates with the relief chamber.
Dependencies are inferred from the claim text.