초록 ▼

The invention relates to a fuel injection device for an internal combustion engine, having a common high-pressure collection chamber (common rail) that can be filled via a high-pressure pump. The high-pressure collection chamber communicates with injection valves, each of which includes a control va

The invention relates to a fuel injection device for an internal combustion engine, having a common high-pressure collection chamber (common rail) that can be filled via a high-pressure pump. The high-pressure collection chamber communicates with injection valves, each of which includes a control valve embodied as a 3/2-way valve. Control faces are provided on the control part, which connect a high-pressure collection supply line to inflow lines to the injection nozzle or with a relief line, and the control part is actuatable by a controlled outflow line. The control part includes a throttle element, which via a bore communicates with a hollow chamber.

대표청구항 ▼

1. In a fuel injection device for an internal combustion engine, having a common high-pressure collection chamber that can be filled via a high-pressure pump and that communicates with injection valves, which contain a control part ( 2) embodied as a 3/2-way valve which includes control faces (5,6,1

1. In a fuel injection device for an internal combustion engine, having a common high-pressure collection chamber that can be filled via a high-pressure pump and that communicates with injection valves, which contain a control part ( 2) embodied as a 3/2-way valve which includes control faces (5,6,19) that connect a high-pressure collection supply line (18) with an injection line (9,9′) or with a relief line (4), the control part (2) being actuatable by means of a controlled outflow line (23), the improvement wherein the control part (2) includes a throttle element (10), which communicates with a hollow chamber (7) via a bore (11).2. The fuel injection device of claim 1, wherein the bore (11) communicates with a nozzle inlet (9) via the throttle element (10).3. The fuel injection device of claim 1, comprising a further throttle element (14), which prevents cavitation upon pressure relief of the injection nozzle (13), is included in the relief line (4).4. The fuel injection device of claim 1, wherein, by closure of the relief line (4) by the control faces (5,6) of the control part (2), the closing pressure exerted on the control part is increased.5. The fuel injection device of claim 1, wherein by means of the dimensioning of the cross section of the throttle element (10), the hollow chamber (7) is completely pressure-relieved.6. The fuel injection device of claim 1, wherein by means of the dimensioning of the cross section of the throttle element (10), a residual pressure in the hollow chamber (7) that increases the opening pressure of the injection nozzle (13) can be set.7. The fuel injection device of claim 1, wherein by means of the throttle element (10), the hollow chamber (7) can be vented when the engine is first started.8. The fuel injection device of claim 1, wherein by means of the throttle element (10), a pressure equalization between a nozzle needle (8) and the hollow chamber (7) is established at the control part (2) in the event of malfunctions of the control part (2).9. The fuel injection device of claim 8, wherein by means of the cross section of the throttle element (10) when maximal system pressure is applied, the time difference in the pressure equalization that is established at the nozzle needle (8) can be predetermined, and thus the maximum injection quantity is defined.