US 7,677,479 B2Granted

Fuel injection valve and manufacturing method thereof

AssigneeMitsubishi Electric Corporation

InventorsKazunori Kitagawa, Kouichi Ojima, Yoshihiko Onishi

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Abstract

When a fuel injection valve is mounted on an engine, a distance between a core and an armature during non-energization of a coil can be prevented from becoming narrow. The coil is arranged inside the core, and a body is fixedly secured at its one end to an end of the core. A housing is arranged outside the coil with its one end abutting a cylinder head. A cap is arranged at the other end of the housing, and abuts at its side opposite to the housing with a fastening unit. The armature is arranged for reciprocation inside the body, and is magnetically attracted to the magnetized core. A gap is formed between the housing and the body, with the cap and the core being fixed to each other, and upon mounting the valve on the engine, the housing and the fastening unit abut the cylinder head and the cap, respectively.

Claims7

Dependent claims

A fuel injection valve comprising:

a coil that is adapted to be energized to generate a magnetic field;
a core that has an end portion arranged at an inner side of said coil and is magnetized by said magnetic field generated by said coil;
a cylindrical body made of a magnetic material that has an end portion fixedly secured the end portion of said core;
a cylindrical housing made of a magnetic material that is arranged at an outer side of said coil, and has one end portion thereof adapted to cover one axial end portion of said coil and at the same time arranged in abutment with a cylinder head of an engine;
a cap made of a magnetic material that is arranged at the other end portion of said housing so as to cover the other axial end of said coil, and is in abutment at a side thereof opposite to said housing with a fastening unit;
and
an armature that is arranged at an inner side of said body so as to be movable for reciprocation, and is adapted to be magnetically attracted to said magnetized core;
wherein a fixed connection is made either between a pair of said housing and said body, or between a pair of said cap and said core, and a first gap is formed between the other pair;
and
when said fuel injection valve is mounted on said engine, said housing is in abutment with said cylinder head, and said fastening unit is in abutment with said cap.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/111,473Filed 29 Apr 2008
Priority: JP 2007-28169530 Oct 2007
Published: US 2009/0108107 A130 Apr 2009
Granted: 16 Mar 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F02M 51/0653
The armature having a valve attached thereto: the valve being an elongated body, e.g. a needle valve
F02M 61/168
Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14: assembling; Disassembling; Manufacturing;…
Y10T 29/49314
Poppet or I.C. engine valve or valve seat making: with assembly or composite article making
Y10T 29/49405
Method of mechanical manufacture: valve or choke making