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US 4,540,126 AGranted
Fuel injection nozzle
AssigneeNissan Motor Co., Ltd.
InventorsKenji Yoneda, Kunihiko Sugihara
Life of this patent
Estimating the term…
Abstract
A fuel injection nozzle is provided with such an annular fuel passage that its fuel passage section is, at the earlier stage of fuel injection, maintained smaller than the whole sum of the sectional areas of injection orifices and adapted to increase gradually in response to the lift of a nozzle needle so that the rate of fuel injection increases gradually.
Claims10
A fuel injection nozzle comprising:
- a hollow nozzle body formed at the tip portion thereof with a conical valve seat and at least one fuel injection orifice having an upstream end located in said valve seat;
- a nozzle needle axially movable in said nozzle body and formed at an end with a conical seating surface engageable with said valve seat to provide an initial section between said valve seat and said seating surface for controlling fuel flow through said injection orifice in response to the lift of said nozzle needle;
- and
- means for defining an annular fuel passage between said nozzle body and said nozzle needle at a location upstream of said initial section, said means including an elongated section separate from said initial section, said elongated section having a fuel passage section of which the sectional area is, at the earlier stage of fuel injection, maintained smaller than the sectional area of said injection orifice and which is adapted to prolong the gradual increase in flow to said fuel injection orifice in response to the lift of said nozzle needle.
1 more element
A fuel injection nozzle comprising:
- a hollow nozzle body formed at the tip portion thereof with a conical valve seat and a plurality of injection orifices having an upstream end located in said valve seat;
- a nozzle needle axially movable in said nozzle body and formed at an end with a conical seating surface engageable with said valve seat to provide an initial section between said valve seat and said seating surface for controlling fuel flow through said orifices in response to the lift of said nozzle needle;
- and
- means for defining an annular fuel passage between said nozzle body and said nozzle needle at a location upstream of said initial section, said means including an elongated section separate from said initial section, said elongated section having a fuel passage section of which the sectional area is, at the earlier of fuel injection, maintained smaller than the whole sum of the sectional areas of said injection orifices and which is adapted to prolong the gradual increase in flow to said fuel injection orifice in response to the lift of said nozzle needle.
1 more element
Dependencies are inferred from the claim text.