Hollow oversized telescopic needle with armature
First Claim
1. A fuel injector comprising:
- a hollow body having an upstream segment and a downstream segment; and
a valve having;
a needle assembly reciprocably mounted in the hollow body, the needle assembly including;
an upstream segment having;
a first longitudinal channel extending therethrough; and
a magnetic armature located within the first longitudinal channel, the armature including a passage extending therethrough; and
a downstream segment having;
a second longitudinal channel co-axial with and communicating with the first longitudinal channel, the second longitudinal channel extending therethrough;
a seating body located at a downstream end of the downstream segment; and
a transverse passage located upstream of the seating body, the transverse passage communicating with at least one of the first and the second longitudinal channels; and
a seat disposed downstream of the needle, the seating body being adapted to sealingly mate with the seat when the needle is in a closed position, wherein the downstream segment is connected to the upstream segment with a telescopic connection.
1 Assignment
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Accused Products
Abstract
A fuel injector is disclosed. The fuel injector includes a hollow body having an upstream segment and a downstream segment and a valve. The valve has a needle assembly which includes an upstream segment having a first longitudinal channel extending therethrough and a magnetic armature located within the first longitudinal channel. The armature includes a passage extending therethrough. The needle assembly also includes a downstream segment having a second longitudinal channel co-axial with and communicating with the first longitudinal channel. The second longitudinal channel extends through the downstream segment. The needle assembly also includes a seating body located at a downstream end of the downstream segment and a transverse passage located upstream of the seating body. The transverse passage communicates with at least one of the first and the second longitudinal channels. A method of fabricating a needle assembly for a fuel injector is also disclosed.
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Citations
28 Claims
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1. A fuel injector comprising:
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a hollow body having an upstream segment and a downstream segment; and
a valve having;
a needle assembly reciprocably mounted in the hollow body, the needle assembly including;
an upstream segment having;
a first longitudinal channel extending therethrough; and
a magnetic armature located within the first longitudinal channel, the armature including a passage extending therethrough; and
a downstream segment having;
a second longitudinal channel co-axial with and communicating with the first longitudinal channel, the second longitudinal channel extending therethrough;
a seating body located at a downstream end of the downstream segment; and
a transverse passage located upstream of the seating body, the transverse passage communicating with at least one of the first and the second longitudinal channels; and
a seat disposed downstream of the needle, the seating body being adapted to sealingly mate with the seat when the needle is in a closed position, wherein the downstream segment is connected to the upstream segment with a telescopic connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A needle assembly for a fuel injector comprising:
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an upstream segment having;
a first longitudinal channel extending therethrough; and
a magnetic armature located within the first longitudinal channel, the armature including a passage extending therethrough; and
a downstream segment having;
a second longitudinal channel co-axial with and communicating with the first longitudinal channel, the second longitudinal channel extending therethrough;
a seating body located at a downstream end of the downstream segment; and
a transverse passage located upstream of the seating body, the transverse passage communicating with at least one of the first and the second longitudinal channels, wherein the downstream segment is connected to the upstream segment with a telescopic connection. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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13. A needle assembly for a fuel injector comprising:
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an upstream segment having;
a first longitudinal channel extending therethrough; and
a magnetic armature located within the first longitudinal channel, the armature including a passage extending therethrough; and
a downstream segment having;
a second longitudinal channel co-axial with and communicating with the first longitudinal channel, the second longitudinal channel extending therethrough;
a seating body located at a downstream end of the downstream segment; and
a transverse passage located upstream of the seating body, the transverse passage communicating with at least one of the first and the second longitudinal channels.
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23. A method of fabricating a needle assembly for a fuel injector comprising:
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providing an upstream segment having a first longitudinal channel extending therethrough;
providing a downstream segment having a second longitudinal channel extending therethrough, the downstream segment further having a seating surface and a transverse opening extending therethrough upstream from the seating surface;
aligning the first longitudinal channel co-axially with the second longitudinal channel;
inserting one of the upstream segment and the downstream segment into the other of the upstream segment and the downstream segment; and
fixedly connecting the upstream segment and the downstream segment. - View Dependent Claims (24, 25)
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26. A fuel injector having a housing including an inlet, an outlet, and a passageway for fuel flow from the inlet to the outlet, the fuel injector comprising:
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a coil assembly disposed proximate the inlet of the fuel injector;
a seat disposed proximate the outlet of the fuel injector; and
a closure member disposed in the housing and operable by the coil assembly to permit and prohibit fuel flow through the seat, the closure member including;
a sleeve extending along a longitudinal axis and having first and second ends, the first end including an inner surface a first distance from the longitudinal axis; and
an armature disposed within the first end of the sleeve, the armature having an outer perimeter a second distance from the longitudinal axis, the second distance not greater than the first distance. - View Dependent Claims (27)
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28. A fuel injector having a housing including an inlet, an outlet, and a passageway for fuel flow from the inlet to the outlet, the fuel injector comprising:
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a coil assembly disposed proximate the inlet of the fuel injector;
a seat disposed proximate the outlet of the fuel injector; and
a closure member disposed in the housing and operable by the coil assembly to permit and prohibit fuel flow through the seat, the closure member including;
a sleeve extending along a longitudinal axis and having first and second ends, the first end including an inner surface a first distance from the longitudinal axis; and
an armature disposed within the first end of the sleeve, the armature having an outer perimeter a second distance from the longitudinal axis, the second distance not greater than the first distance, wherein the first end of the sleeve comprises a first tube and the second end of the sleeve comprises a second tube coupled to the first tube.
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Specification