Fuel Injection Valve

Patent metadata

Field	Value
Publication number	US-2016305385-A1
Application number	US-201615189069-A
Country	US
Kind code	A1
Filing date	Jun 22, 2016
Priority date	Jan 11, 2012
Publication date	Oct 20, 2016
Grant date	—

Abstract

One passage for swirling is formed in an orifice plate fixed on a nozzle body. Two swirl chambers in which fuel is caused to swirl so that the fuel has swirling force are provided at an end of the one passage for swirling on the downstream side of the flow direction of fuel. Therefore, the collision between the swirling flow in the swirl chamber and the fuel flowing in the passage for swirling is mitigated, and the swirling flow can be smoothly produced to promote pulverization of sprays injected from fuel injection ports.

First claim

1 . A fuel injection valve comprising:
a plurality of fuel injection ports formed in an orifice plate; a swirl chamber causing fuel injected from the fuel injection ports to swirl; and a passage for swirling through which fuel is supplied to the swirl chamber, wherein a dividing portion for dividing fuel flow is formed on downstream side of the passage for swirling.

2 . The fuel injection valve according to claim 1 , wherein the dividing portion is formed as a sharp edge-shaped portion toward upstream side of the passage for swirling.

3 . The fuel injection valve according to claim 1 , wherein the dividing portion is formed as a thickness forming portion having a predetermined thickness in a width direction perpendicular to a flow direction of the fuel in the swirl chamber.

4 . The fuel injection valve according to claim 3 , wherein the thickness forming portion has a circular section.

5 . The fuel injection valve according to claim 1 , wherein the dividing portion is arranged on a central axis of the passage for swirling.

6 . The fuel injection valve according to claim 1 , wherein a width of the passage for swirling is formed to be larger than a distance from a center of a fuel injection port to an inner wall of the swirl chamber along a flow direction of the passage for swirling.

7 . The fuel injection valve according to claim 1 , wherein a thickness forming portion is provided at the connection between a downstream end of an inner peripheral wall of the swirl chamber and a side wall of the passage for swirling.

8 . The fuel injection valve according to claim 7 , wherein the thickness forming portion has a circular section.

9 . A fuel injection valve comprising:
a slidable valve element; a valve seat member having a valve seat formed thereon and an opening at a downstream side, the valve element being seated on the valve seat at a time of valve closing; a passage for swirling provided at the downstream side of the opening, the passage for swirling communicating with the opening of the valve seat member; a swirl chamber formed on a downstream side of the passage for swirling, the swirl chamber having a curved inner surface; and a fuel injection port formed in a bottom portion of the swirl chamber, the fuel being injected outside through the fuel injection port, wherein a starting end of the swirl chamber is formed not to position on a side wall of the passage for swirling or an extended line of the side wall.

10 . The fuel injection valve according to claim 9 , wherein the starting end of the swirl chamber is arranged on a central axis of the passage for swirling.

11 . The fuel injection valve according to claim 9 , wherein the inner surface of the swirl chamber has a curvature increasing gradually from the upstream side toward the downstream side.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Okamoto Yoshio
• Yasukawa Yoshihito
• Maekawa Noriyuki
• Kobayashi Nobuaki
• Saito Takahiro

Classifications

• F02M61/162

  Means to impart a whirling motion to fuel upstream or near discharging orifices · CPC title

• F02M61/1853 Primary

  Orifice plates · CPC title

• F02M51/061

  using electromagnetic operating means · CPC title

• F02M51/0664

  having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding · CPC title