Fuel injection valve

Patent metadata

Field	Value
Publication number	US-9726131-B2
Application number	US-44478007-A
Country	US
Kind code	B2
Filing date	Jan 29, 2007
Priority date	Jan 29, 2007
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A fuel injection valve in which a valve element is formed at a distal end thereof with a flat portion 13 c which is substantially parallel with an injection hole plate 11 , injection hole entrances 12 a are arranged inside an imaginary envelop 15 along an intersection between an extension 10 b of a downstream inner wall of a seat portion of a valve seat and an upstream plane 11 c of the injection hole plate and outside the flat plane at the distal end of the valve element, and the relation between the vertical distance h between the flat plane at the distal end of the valve element and the upstream plane of the injection hole plate with the valve opened and the diameter d of the injection hole entrance is h<d, and the injection hole 12 is formed to be inclined by a predetermined angle with respect to the direction of the thickness of the injection hole plate.

First claim

The invention claimed is:

1. A fuel injection valve comprising a valve element for opening and closing a valve seat, the valve element being driven upon reception of an operation signal from a control unit and causing fuel to be injected from a plurality of injection holes formed on an injection hole plate having a projection formed thereon, the injection hole plate mounted on a downstream side of the valve seat,
wherein said projection which projects away from the downstream side of the valve seat so as to extend substantially in parallel with a distal end of the valve element is formed at a center of the injection hole plate, and a flat portion is formed outside of the projection,
wherein the relation between the minimum distance r from the distal end of the valve element to the center of the projection of the injection hole plate with the valve opened and the diameter d of an injection hole entrance is r<d,
wherein the injection hole entrance of each of the injection holes are arranged on the flat portion of the injection hole plate and inside a minimum inner diameter of the valve seat, and
wherein a periphery of the projection creates a virtual circle on the injection hole plate and the injection hole entrance of each of the injection holes is provided on the injection hole plate outside of the virtual circle;
wherein the plurality of injection holes are located along the injection hole plate in a width direction, and
wherein an inner wall of a seat portion of the valve seat had a linear angled edge which is angled from an upstream point to a downstream point with respect to a thickness direction of the flat portion of the injection hole plate such that the linear angled edge extends in an oblique direction with respect to the thickness direction of the flat portion of the injection hole plate and the width direction of the injection hole plate, and the downstream point of the linear angled edge is joined to the injection plate at a connection location, and wherein the connection location is located exterior to the plurality of injection holes in the width direction of the injection hole plate.

2. The fuel injection valve according to claim 1 , wherein a tapered plane having an angle β across the valve element is provided on a downstream side of a seat surface of a seat portion of the valve seat, and when an angle of the seat portion of the valve seat across the valve element is represented by α, a relation of α>β is established, the tapered plane having a greater incline than the seat surface.

3. The fuel injection valve according to claim 2 , wherein a plurality of dimples are provided on the tapered plane.

4. The fuel injection valve according to claim 2 , wherein a plurality of annular grooves are formed on the tapered plane.

5. The fuel injection valve according to claim 1 , wherein, starting from a downstream position and extending to an upstream position, the linear angled edge is angled away from the plurality on injection holes in the width direction of the injection hole plate.

6. The fuel injection valve according to claim 1 , wherein no portion of the linear angled edge is located interior to the plurality of injection holes in the width direction of the injection hole plate.

7. The fuel injection valve according to claim 1 , wherein the thickness direction of the flat portion of the injection hole is perpendicular to the width direction of the injection hole plate.

Assignees

• Hashii Naoya
• Nakano Keishi
• Munezane Tsuyoshi
• Mitsubishi Electric Corp

Inventors

• Hashii Naoya
• Nakano Keishi
• Munezane Tsuyoshi

Classifications

• F02M61/1873

  Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal · CPC title

• F02M61/188

  Spherical or partly spherical shaped valve member ends · CPC title

• F02M51/0678

  all portions having fuel passages, e.g. flats, grooves, diameter reductions · CPC title

• F02M61/1853 Primary

  Orifice plates · CPC title

• F02M61/18 Primary

  Injection nozzles, e.g. having valve seats; {Details of valve member seated ends, not otherwise provided for} · CPC title