US 6,682,046 B2 · Fuel injection valve

Abstract

A fuel injection valve includes, in part, a pipe, a fixed connector (fixed core), a movable core, a solenoid coil and a needle valve. In the fuel injection valve, a diameter of a fixed action surface of the fixed connector is made smaller than a movable action surface of the movable core. Therefore, magnetic flux around an outer circumferential portion is transmitted from the fixed action surface to the movable action surface substantially in a direction perpendicular to the movable action surface. Thus, an electromagnetic force acting therebetween is efficiently transformed to an attracting force for the movable core.

Drawings

Drawings are temporarily unavailable. Open the PDF at USPTO

Drawings

Claims6

Dependent claims

A fuel injection valve comprising:

a cylindrical pipe;
a fixed connector inserted into and fixed to the pipe, the fixed connector having a fixed action surface at one end side and being made of a magnetic material;
a movable core inserted into the pipe so as to slide in contact with an inner circumferential surface of the pipe, the movable core having a movable action surface facing the fixed action surface at one end and being made of a magnetic material;
a solenoid coil energized by a power supply source, for generating magnetic flux transmitted from the fixed action surface to the movable action surface, and for generating an attracting force between the fixed connector and the movable core;
and
a valve body being movable together with the movable core, for opening and closing a fuel injection hole by energizing and de-energizing the solenoid coil, wherein
an outer diameter of the fixed action surface is smaller than an outer diameter of the movable action surface.

4 more elements

Dependencies are inferred from the claim text.

Description3,357 words

Summary1,733 words

#1. Field of the Invention

#The present invention relates to a fuel injection valve operated by an electromagnetic force.

#2. Description of Related Art

Brief description of the drawings3 figures

#The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:

#FIG. 1 is a cross-sectional view showing a fuel injection valve according to an embodiment of the present invention;

#FIG. 2 is a schematic view showing a simulation result of magnetic flux generated between a modeled fixed connector (fixed core) and a modeled movable core (movable core) according to an embodiment of the present invention; and

Detailed description1,523 words

#The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

#FIG. 1 shows a fuel injection valve 1 according to an embodiment of the present invention. The fuel injection valve 1 is disposed on a cylinder head of a vehicular gasoline engine. That is, the fuel injection valve 1 is a direct injection type and an electromagnetic type. The fuel injection valve 1 consists, in part, of a fuel supply portion 10, an electromagnetic driving portion 20, a valve portion 30 and an electric connector portion 40.

#The fuel supply portion 10 is constructed of a fuel connector 11, a fuel filter 12 and an O-ring 13 attached to an outer circumferential portion of the fuel connector 11. The fuel connector 11 is connected to a common rail system (not shown) into which high-pressure fuel is supplied, and the fuel filter 12 is disposed in a fuel passage 111 provided in the fuel connector 11. The fuel connector 11 is connected to the common rail system through using the O-ring 13 in an oil-tight (sealed) fashion.

Facts

Application

10/133,425Filed 29 Apr 2002

Priority

JP 2001-13327927 Apr 2001

Published

US 2002/0158220 A131 Oct 2002

Granted

27 Jan 2004

Term ended

6 Aug 2022

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 99 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification6 codes

F16K 31/0655
One-way valve: lift valves
F02M 51/0614
Using electromagnetic operating means: characterised by arrangement of electromagnets or fixed armature
F02M 51/0671
Having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering…:…
F16K 31/0651
One-way valve: the fluid passing through the solenoid coil

Timeline

27 Apr 2001Priority claimedJP 2001-133279
29 Apr 2002Application filedUS 10/133,425
29 Apr 2002Assigned to Denso Corporationassignment of assignor's interest
31 Oct 2002PublishedUS 2002/0158220 A1
27 Jan 2004GrantedUS 6,682,046 B2
6 Aug 2022Term endedEstimated, includes 99 days of adjustment

Fuel injection valve

Life of this patent

Fuel injection valve

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims6

Description3,357 words

Drawings

Classification6 codes

Life of this patent

Description3,357 words