Fuel injection valve

Patent metadata

Field	Value
Publication number	US-10400729-B2
Application number	US-201314758300-A
Country	US
Kind code	B2
Filing date	Apr 16, 2013
Priority date	Apr 16, 2013
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A fuel injection valve according to the present invention has an expanded portion formed in a first injection-hole plate on an upstream side, thereby allowing positional misalignment between injection-hole portions. As a result, a radial dimension between an inner diameter-side circumferential edge of an upstream-side injection hole outlet portion and an inner diameter-side circumferential edge of a downstream-side injection hole inlet portion is not required. Thus, a plate thickness of a second injection-hole plate on a downstream side can be kept to minimum. As a result, weldability between an injection-hole plate body and a valve seat is improved.

First claim

The invention claimed is:

1. A fuel injection valve, comprising:
a valve seat;
a valve element arranged so as to be opposed to the valve seat and being capable of reciprocating along a central axis line; and
an injection-hole plate body being fixed to the valve seat by welding and having a plurality of injection holes formed therethrough, so that a fuel passes through a clearance between the valve seat and the valve element to be injected through the plurality of injection holes,
the injection-hole plate body comprising:
a first injection-hole plate having a first injection-hole portion and an expanded portion in communication with the first injection-hole portion, wherein, for each of the plurality of injection holes, the first injection-hole portion and the expanded portion have a same central axis extending in parallel, to the central axis injection-hole portion, and
a second injection-hole plate being-laminated on the first injection-hole plate on a downstream side thereof, in communication with the expanded portion and having a second injection-hole portion inclined from the expanded portion in a direction away from the central axis line toward the downstream side of the first injection-hole plate;
wherein an inner diameter-side inner wall surface of the second injection-hole portion at least partially overlaps an inlet-side opening of the first injection-hole portion, the inner diameter-side inner wall surface of the second injection-hole portion being proximate the central axis line,
an outlet-side opening of the first injection-hole portion is encompassed in an inlet-side opening of the expanded portion,
a minimum flow-path area of the first injection-hole portion for the fuel is equal to or smaller than a minimum flow-path area of the second injection-hole portion and a minimum flow-path area of the inlet-side opening of the expanded portion, and is smaller than a minimum flow-path area of the expanded portion, and
each of the plurality of injection holes is comprised of a combination of the first injection-hole portion, the expanded portion, and the second injection-hole portion.

2. The fuel injection valve according to claim 1 , wherein the first injection-hole portion is formed to extend in a direction perpendicular to a surface of the first injection-hole plate.

3. The fuel injection valve according to claim 2 , wherein:
the first injection-hole portion has a cylindrical shape; and
a difference between a plate thickness t of the first injection-hole plate and a height h of the expanded portion is less than a diameter D 1 of the first injection-hole portion.

4. The fuel injection valve according to claim 1 , wherein the valve element has a flat portion at a distal end portion, which is parallel to the first injection-hole plate.

5. The fuel injection valve according to claim 4 , wherein the inlet-side opening of the first injection-hole portion is formed on an inner side of an innermost diameter portion of the valve seat and on an outer side of the flat portion.

6. The fuel injection valve according to claim 4 , wherein the inlet-side opening of the first injection-hole portion is formed so as to be opposed to the flat portion.

7. The fuel injection valve according to claim 1 , wherein:
the valve element has an arcuate surface at a distal end portion; and
the injection-hole plate body has a recess portion opposed to and separated away from the arcuate surface.

8. The fuel injection valve according to claim 1 , wherein a central axis of the second injection-hole portion is inclined with respect to the central axis extending through the first injection-hole portion and the expanded portion.

9. The fuel injection valve according to claim 1 , wherein the outlet-side opening of the first injection-hole portion overlaps an inlet-side opening of the second injection-hole portion.

Assignees

• Mitsubishi Electric Corp

Inventors

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

Classifications

• F02M2200/8084

  involving welding or soldering · CPC title

• F02M51/0682

  the body being hollow and its interior communicating with the fuel flow (F02M51/0675 takes precedence) · CPC title

• Y10T137/87265

  Dividing into parallel flow paths with recombining · CPC title

• F16K1/32

  Details (details of more general applicability F16K25/00 - F16K51/00) · CPC title

• F16K27/102

  for lift-valves · CPC title