Importance

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Abstract

The movement of an injector valve member (52) which closes and temporarily opens discharge orifices (58) communicating with the combustion chamber of an internal combustion engine is controlled by the fuel pressure in a control chamber (72) and by a difference in the pressure forces acting on a piston (60) having two sections (63, 69) with different diameters arranged at one end of the valve member (52). The pressure in the control chamber (72) to control the movement of the valve member (52) is controlled by means of two axially aligned orifices (67, 70) and by a solenoid valve (S) for closing and temporarily opening one of said orifices (70). A member (71) and the top end of the thicker section (69) of the piston (60) define said control chamber (72). Said thicker section (69) guides said member (71) at its inside, while the latter is not guided on its circumference (71b). The thinner section (63) of piston (60) is guided in the injector housing (44). The piston (60) is provided with a bore (65) connecting a chamber (46) communicating with the discharge orifices (58) across the other orifices (67) with the control chamber (72).

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First Claim