US 6,601,786 B2 · Fuel injection valve · patentgrep

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Abstract

In a fuel injection valve, a cylindrical valve body has a valve seat protruding radially inward out of an inner wall thereof and a needle supporting cylindrical inner wall. A nozzle needle is fixed to the armature so as to move together with the armature, while being supported slidably by the needle supporting cylindrical inner wall. The nozzle needle is provided with a valve portion to be seated on the valve seat when a coil is de-energized and inside thereof with a cavity into which fuel is introduced. A fuel accumulation bore is provided between inner circumference of the cylindrical valve body and outer circumference of the nozzle needle. With the construction mentioned above, the nozzle needle is provided with an opening through which the cavity communicates with the fuel accumulation bore.

Claims12

Dependent claims

A fuel injection valve comprising:

a housing;
a stator fixed to the housing;
a cylindrical valve body fixed to the housing, the cylindrical valve body being provided at an axial end thereof on a side opposite to the stator with at least an injection hole and having a valve seat protruding radially inward out of an inner wall thereof, which is positioned on a side of the stator with respect to the injection hole, and a needle supporting cylindrical inner wall, which is positioned on a side of the stator with respect to the valve seat;
an armature accommodation bore provided in the housing between the stator and the cylindrical valve body;
an armature movable in the armature accommodation bore;
a coil for exerting an electromagnetic attracting force on the armature so as to be attracted toward the stator when energized;
a nozzle needle fixed to the armature and movable together with the armature in the cylindrical valve body and the armature accommodation bore, while being supported slidably by the needle supporting cylindrical inner wall, the nozzle needle being provided with a valve portion to be seated on the valve seat when the coil is de-energized and inside thereof with a cavity into which fuel is introduced;
and
a fuel accumulation bore provided between an inner circumference of the cylindrical valve body extending axially from the valve seat to the needle supporting cylindrical inner wall and an outer circumference of the nozzle needle;
wherein the nozzle needle is provided with an opening through which the cavity communicates with the fuel accumulation bore so that, when the valve portion leaves the valve seat upon energizing the coil, the fuel accumulation bore communicates with the injection hole for fuel injection;
and
the housing has a hollow into which fuel is flown from outside and the stator is provided with a penetrating bore communicating with the hollow of the housing at an axial end thereof and communicating with the armature accommodation bore at another axial end thereof, and the armature has a through-hole for making the armature accommodation bore on a side of the stator communicate with the cavity so that fuel is introduced from the hollow of the housing into the cavity.

9 more elements

A fuel injection valve comprising:

a housing;
a stator fixed to the housing;
a cylindrical valve body fixed to the housing, the cylindrical valve body being provided at an axial end thereof on a side opposite to the stator with at least an injection hole and having a valve seat protruding radially inward out of an inner wall thereof, which is positioned on a side of the stator with respect to the injection hole, and a needle supporting cylindrical inner wall, which is positioned on a side of the stator with respect to the valve seat;
an armature accommodation bore provided in the housing between the stator and the cylindrical valve body;
an armature movable in the armature accommodation bore;
a coil for exerting an electromagnetic attracting force on the armature so as to be attracted toward the stator when energized;
a nozzle needle fixed to the armature and movable together with the armature in the cylindrical valve body and the armature accommodation bore, while being supported slidably by the needle supporting cylindrical inner wall, the nozzle needle being provided with a valve portion to be seated on the valve seat when the coil is de-energized and inside thereof with a cavity into which fuel is introduced;
and
a fuel accumulation bore provided between an inner circumference of the cylindrical valve body extending axially from the valve seat to the needle supporting cylindrical inner wall and an outer circumference of the nozzle needle;
wherein the nozzle needle is provided with an opening through which the cavity communicates with the fuel accumulation bore so that, when the valve portion leaves the valve seat upon energizing the coil, the fuel accumulation bore communicates with the injection hole for fuel injection;
and
the opening is formed to axially stride over the needle supporting cylindrical inner wall so that the cavity communicates not only with the fuel accumulation bore but also with the armature accommodation bore on a side of the cylindrical valve body.

9 more elements

A fuel injection valve comprising:

a housing;
a stator fixed to the housing;
a cylindrical valve body fixed to the housing, the cylindrical valve body being provided at an axial end thereof on a side opposite to the stator with at least an injection hole and having a valve seat protruding radially inward out of an inner wall thereof, which is positioned on a side of the stator with respect to the injection hole, and a needle supporting cylindrical inner wall, which is positioned on a side of the stator with respect to the valve seat;
an armature accommodation bore provided in the housing between the stator and the cylindrical valve body;
an armature movable in the armature accommodation bore;
a coil for exerting an electromagnetic attracting force on the armature so as to be attracted toward the stator when energized;
a nozzle needle fixed to the armature and movable together with the armature in the cylindrical valve body and the armature accommodation bore, while being supported slidably by the needle supporting cylindrical inner wall, the nozzle needle being provided with a valve portion to be seated on the valve seat when the coil is de-energized and inside thereof with a cavity into which fuel is introduced;
and
a fuel accumulation bore provided between an inner circumference of the cylindrical valve body extending axially from the valve seat to the needle supporting cylindrical inner wall and an outer circumference of the nozzle needle;
wherein the nozzle needle is provided with an opening through which the cavity communicates with the fuel accumulation bore so that, when the valve portion leaves the valve seat upon energizing the coil, the fuel accumulation bore communicates with the injection hole for fuel injection;
and
the nozzle needle is provided with a small diameter column portion whose axial end on a side of the injection hole constitutes the valve portion and with a large diameter column portion whose diameter is larger than that of the small diameter column portion and which is slidably supported by the needle supporting cylindrical inner wall.

9 more elements

A fuel injection valve comprising:

a housing;
a stator fixed to the housing;
a cylindrical valve body fixed to the housing, the cylindrical valve body being provided at an axial end thereof on a side opposite to the stator with at least an injection hole and having a valve seat protruding radially inward out of an inner wall thereof, which is positioned on a side of the stator with respect to the injection hole, and a needle supporting cylindrical inner wall, which is positioned on a side of the stator with respect to the valve seat;
an armature accommodation bore provided in the housing between the stator and the cylindrical valve body;
an armature movable in the armature accommodation bore;
a coil for exerting an electromagnetic attracting force on the armature so as to be attracted toward the stator when energized;
a nozzle needle fixed to the armature and movable together with the armature in the cylindrical valve body and the armature accommodation bore, while being supported slidably by the needle supporting cylindrical inner wall, the nozzle needle being provided with a valve portion to be seated on the valve seat when the coil is de-energized and inside thereof with a cavity into which fuel is introduced;
and
a fuel accumulation bore provided between an inner circumference of the cylindrical valve body extending axially from the valve seat to the needle supporting cylindrical inner wall and an outer circumference of the nozzle needle;
wherein the nozzle needle is provided with an opening through which the cavity communicates with the fuel accumulation bore so that, when the valve portion leaves the valve seat upon energizing the coil, the fuel accumulation bore communicates with the injection hole for fuel injection;
and
an outer circumference of the armature is in slidable contact with a circumferential wall constituting the armature accommodation bore in the housing so that the armature is slidably supported by axially spaced two supporting points.

9 more elements

A fuel injection valve comprising:

a housing;
a stator fixed to the housing;
a cylindrical valve body fixed to the housing, the cylindrical valve body being provided at an axial end thereof on a side opposite to the stator with at least an injection hole and having a valve seat protruding radially inward out of an inner wall thereof, which is positioned on a side of the stator with respect to the injection hole, and a needle supporting cylindrical inner wall, which is positioned on a side of the stator with respect to the valve seat;
an armature accommodation bore provided in the housing between the stator and the cylindrical valve body;
an armature movable in the armature accommodation bore;
a coil for exerting an electromagnetic attracting force on the armature so as to be attracted toward the stator when energized;
a nozzle needle fixed to the armature and movable together with the armature in the cylindrical valve body and the armature accommodation bore, while being supported slidably by the needle supporting cylindrical inner wall, the nozzle needle being provided with a valve portion to be seated on the valve seat when the coil is de-energized and inside thereof with a cavity into which fuel is introduced;
and
a fuel accumulation bore provided between an inner circumference of the cylindrical valve body extending axially from the valve seat to the needle supporting cylindrical inner wall and an outer circumference of the nozzle needle,
wherein the nozzle needle is provided on an outer circumference thereof with an opening at least part of which is opened to the fuel accommodation bore from the cavity so that the fuel introduced into the cavity flows through the opening to the fuel accumulation bore, and when the valve portion leaves the valve seat upon energizing the coil, the fuel accumulation bore communicates with the injection hole for fuel injection.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/852,636Filed 11 May 2001
Priority: JP 2000-13970212 May 2000
Published: US 2001/0040194 A115 Nov 2001
Granted: 5 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F02M 61/18
Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14: injection nozzles, e.g. having valve seats;…
F02M 51/0682
The armature having an elongated valve body attached thereto: the body being hollow and its interior communicating with the fuel flow
F02M 51/0678
The valve body having cylindrical guiding or metering portions, e.g. with fuel passages: all portions having fuel passages, e.g. flats, grooves,…
F02M
Supplying combustion engines in general with combustible mixtures or constituents thereof

Family

US 2001/0040194 A1Pre-grant publication · published 15 Nov 2001
US 6,601,786 B2This patent

From the US filing history. Foreign family members aren’t listed.

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