Fuel injection valve

Patent metadata

Field	Value
Publication number	US-10975820-B2
Application number	US-201916517725-A
Country	US
Kind code	B2
Filing date	Jul 22, 2019
Priority date	Aug 26, 2014
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A fuel injection valve includes: a circular plate portion that is abuttable against an end surface of a needle opposite from a valve seat while the needle being provided to open and close an injection hole upon lifting and seating of the needle relative to the valve seat; and a tubular portion that extends from the circular plate portion toward the valve seat and has an end part, which is opposite from the circular plate portion and is abuttable against a movable core second contact surface of a movable core opposite from the valve seat. In a state where the circular plate portion abuts against the needle, and the tubular portion abuts against the movable core, a gap is formed between a flange member end surface of a flange of the needle and a movable core first contact surface of the movable core opposite from the valve seat.

First claim

The invention claimed is:

1. A fuel injection valve comprising:
a housing that is shaped into a tubular form and includes:
an injection hole that is formed at one end part of the housing in an axial direction of a central axis of the housing to inject fuel;
a valve seat that is formed around the injection hole; and
a fuel passage that conducts the fuel to the injection hole;

a needle that includes a flange, which radially outwardly projects from an outer peripheral surface of the needle, wherein the needle is axially reciprocatably received in the housing and opens or closes the injection hole when the needle is lifted away from the valve seat or is seated against the valve seat;
a stationary core that is fixed in an inside of the housing;
a movable core that is movable relative to the needle and is axially abuttable against the flange;
a coil that attracts the movable core toward the stationary core when an electric power is supplied to the coil; and
a flange receiving member that includes:
a contact member that is placed on an axial side of the flange, which is opposite to the injection hole, wherein the contact member radially extends along the flange and is axially abuttable against the flange; and
a leg member that is formed integrally with the contact member in one piece and axially projects from an outer periphery of the contact member toward the injection hole and is axially abuttable against the movable core, wherein:

a gap is formed between the movable core and the flange when the contact member axially abuts against the flange; and
the leg member has:
an inner peripheral surface that is axially slidable along an outer peripheral surface of the flange; and
an outer peripheral surface that is entirely uncovered and is exposed to an inside space of the housing throughout an entire axial extent of the flange receiving member.

Assignees

• Denso Corp

Inventors

• Matsukawa Tomoji
• Itoh Eiji
• Yamamoto Shinsuke
• Mochizuki Kouichi

Classifications

• F02M51/0671 Primary

  the armature having an elongated valve body attached thereto · CPC title

• F02M51/0685

  the armature and the valve being allowed to move relatively to each other or not being attached to each other · CPC title

• F02M2200/50

  Arrangements of springs for valves used in fuel injectors or fuel injection pumps · CPC title

• F02M63/0075

  Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring · CPC title

• F02M61/166 Primary

  Selection of particular materials · CPC title