| 摘要 |
<p>An injection nozzle comprises a valve needle (16) engageable with a seating. The needle (16) includes a surface arranged such that when the needle (16) occupies a fully lifted position, part of the surface is exposed to the fuel pressure within a control chamber (24) whilst a second part of the surface is exposed to the fuel pressure within a second chamber (28). Independent restricted passages (30, 30a, 60, 62) provide communication between the control and second chambers (24, 28) and a supply line (56). A control valve communicates with the second chamber (28) to control operation of the injection nozzle. The control valve is actuated by an electromagnetic actuator having a core arrangement - armature air gap of tapering axial length. <IMAGE></p> |
