Fuel injection valve

Patent metadata

Field	Value
Publication number	US-9863380-B2
Application number	US-201214395854-A
Country	US
Kind code	B2
Filing date	Aug 9, 2012
Priority date	Aug 9, 2012
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

When injection-hole inlets and injection-hole outlets are projected vertically onto an X-Y plane (N) perpendicular to a valve-seat axial center, an injection-hole arrangement angle (θ), which is formed by a straight line (a) passing through a center of the injection-hole inlet of a reference injection hole and the valve-seat axial center and a straight line (b) passing through a center of the injection-hole inlet of the injection hole neighboring the reference injection hole and the valve-seat axial center on the plane (N), is set so as to become smaller as being closer to a Y-axis. A fuel turn angle (α) on a wide-angle side, which is formed by the straight line (a) and a straight line (c) passing through a center of the injection-hole inlet and a center of the injection-hole outlet on the plane (N), has a relationship: 90°<α<180°.

First claim

The invention claimed is:

1. A fuel injection valve, comprising:
a valve seat having a valve-seat seating surface provided on an open end of the fuel injection valve;
a valve element provided so as to be opposed to the valve seat, for opening and closing the valve seat; and
an injection-hole plate mounted on a downstream side of the valve seat, having a plurality of injection holes,
the fuel injection valve being configured to operate the valve element in a valve-opening direction in response to an operation signal from an engine control unit so as to allow a fuel to pass between the valve element and the valve-seat seating surface, to thereby inject a spray aggregate from the plurality of injection holes toward an intake valve,
wherein the plurality of injection holes are formed on a radially outer side of a valve-seat opening inner wall that is a portion having a minimum inner diameter of the valve seat with a diameter reduced toward the downstream side,
wherein the valve seat has a cavity formed in a downstream-side end surface of the valve seat, for bringing the valve-seat opening inner wall and each of the plurality of injection holes into communication with each other,
wherein, when a straight line obtained by projecting a cylinder central axis (O) of an engine onto a plane (N) that is perpendicular to a valve-seat axial center of the valve seat is a P-axis, a straight line passing through the valve-seat axial center and being perpendicular to the P-axis on the plane (N) is an X-axis, a straight line parallel to the P-axis on the plane (N) is a Y-axis, and when one of the plurality of injection holes in a case where injection-hole inlets and injection-hole outlets of the plurality of injection holes are projected vertically onto the plane (N) is set as a reference injection hole, an inter-injection hole angle (θ), which is formed by a straight line (a) passing through a center of the injection-hole inlet of the reference injection hole and the valve-seat axial center and a straight line (b) passing through a center of the injection-hole inlet of the injection hole adjacent to the reference injection hole along a radial direction and the valve-seat axial center on the plane (N), is set such that the inter-injection hole angle (θ) becomes smaller the closer the corresponding injection holes are to the Y-axis, and a fuel turn angle (α) on a wide-angle side in an angle formed by the straight line (a) and a straight line (c) passing through the center of the injection-hole inlet and a center of the injection-hole outlet on the plane (N) satisfies a relationship: 90°<α<180°,
wherein the injection-hole plate comprises concave portions formed on a downstream-side end surface of the injection-hole plate on a one-to-one basis with respect to the plurality of injection holes, each having a larger opening area than an opening area of the each of the plurality of injection holes,
wherein the concave portions are arranged so that a region where an injection-hole length is short becomes larger on a side of a desired injection direction than on an opposite side with respect to the straight line (c), and
wherein the injection-hole inlets are arranged in a virtual circle on the plane (N).

2. A fuel injection valve according to claim 1 , wherein, when a circle formed by projecting a cavity inner wall of the cavity vertically onto the plane (N) is a virtual circle, a distance (r) from an edge of each of the injection-hole inlets on a radially outer side with respect to the valve-seat axial center to the virtual circle on the straight line (a) and a diameter (φ) of the each of the plurality of injection holes satisfy a relationship: φ<r.

3. A fuel injection valve according to claim 1 , wherein a height (h) immediately above the each of the plurality of injection holes, which is represented by a distance between the center of the each of the injection-hole inlets and the cavity in a direction of the valve-seat axial center, and a diameter (φ) of the each of the plurality of injection holes satisfy a relationship: h<φ.

4. A fuel injection valve according to claim 1 , wherein the cavity has a tapered shape so that a height in a direction of the valve-seat axial center is reduced toward an outer circumferential side.

5. A fuel injection valve according to claim 1 , wherein a distance from the valve-seat axial center to the center of the each of the injection-hole inlets on the plane (N) is set so as to become shorter the closer the injection-hole inlet is to the X-axis.

6. A fuel injection valve according to claim 1 , wherein a distance from the valve-seat axial center to the center of the each of the injection-hole inlets on the plane (N) is set so as to become shorter the closer the injection-hole inlet is to the Y-axis.

7. A fuel injection valve according to claim 1 , wherein, when a plane that is perpendicular to a central axis of the each of the plurality of injection holes is a cross section in a flow path of the each of the plurality of injection holes, a cylindrical portion having a minimum area in a radial direction of the each of the plurality of injection holes as a cross section is ensured between an upstream-side end surface of the injection-hole plate and a bottom surface of each of the concave portions.

8. A fuel injection valve according to claim 1 , wherein the each of the concave portions is configured so that an opening area open on the downstream-side end surface of the injection-hole plate becomes larger than a bottom-surface area the each of the concave portions.

9. A fuel injection valve according to claim 1 , wherein the concave portions are formed by press molding.

Assignees

• Sakata Yukitaka
• Munezane Tsuyoshi
• Hashii Naoya
• Ito Keisuke
• Watanabe Kyosuke
• KAWASAKI Shota
• Mitsubishi Electric Corp

Inventors

• Sakata Yukitaka
• Munezane Tsuyoshi
• Hashii Naoya
• Ito Keisuke
• Watanabe Kyosuke
• KAWASAKI Shota

Classifications

• F02M61/188

  Spherical or partly spherical shaped valve member ends · CPC title

• F02M61/1806 Primary

  characterised by the arrangement of discharge orifices, e.g. orientation or size · CPC title

• F02M61/1833 Primary

  Discharge orifices having changing cross sections, e.g. being divergent · CPC title

• F02M51/0632 Primary

  having a spherically or partly spherically shaped armature, e.g. acting as valve body · CPC title

• F02M61/184

  Discharge orifices having non circular sections · CPC title