Importance

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Abstract

A fuel-injection nozzle consists of a nozzle housing terminating in a nozzle tip, a pintle guided in the housing, the pintle is pressed by spring action against a conical valve seat in the nozzle tip, the conical valve seat has a plurality of spray holes selectively covered by the conical end of the pintle and passing into a blind hole, the corresponding imaginary cylinder surface area (M) which results, along the extension of each spray hole, between the conical end of the pintle and the conical valve seat being smaller at the end of the first phase of the stroke than the cross-sectional area (Q) of the corresponding spray hole. In order further to improve the emission behavior as a whole, the imaginary cylinder surface area (M) is at most 0.3 times the cross-sectional area (Q) of the corresponding spray hole and the entrance zone into the spray hole is rounded with a radius of at least one-tenth the diameter of the spray hole.

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First Claim