Importance

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Abstract

A fuel injection valve for intermittent injection of fuel into the combustion chamber of a diesel or other form of internal combustion engine. The valve achieves a shorter than usual injection valve member, while avoiding valve member oscillation but retaining precise closing by implementing a solenoid controlled piston that controls movement of the valve. The piston in turn is acted upon by fuel system pressure from a high pressure feed line and from a control chamber, alternatively, depending upon the position of an actuating element. The control piston has an annular land that faces the control chamber and the piston is connected to the high pressure feed line through a tight sliding fit in a piston guide bore establishing a leak gap. A relief chamber is formed between the outlet side of the gap and the land. When the injection valve is open, the land reduces fuel flow from the relief chamber into the control chamber. As a result, fuel pressure in the relief chamber rises compared to that in the control chamber.

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First Claim