# US 4,394,974 A · Fuel injector valve

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- Number: US 4,394,974 A
- Document ID: US4394974A
- Status: Granted
- Kind: A
- Application number: 06/242,421
- Filed: 1981-03-11
- Granted: 1983-07-26
- Earliest claimed: 1980-03-24
- Assignees: Nissan Motor Co., Ltd.
- Inventors: Masaaki Saito; Tadaki Ota
- Web page: https://patentgrep.com/patent/US4394974A

## CPC

- F02M 51/0632: {having a spherically or partly spherically shaped armature, e.g. acting as valve body}
- F02M 51/08: specially for low-pressure fuel-injection
- Y10S 239/90: Electromagnetically actuated fuel injector having ball and seat type valve
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A fuel injector valve comprises a main magnetic pole securely disposed within a casing and provided with an electromagnetic coil wound thereon, a valve seat member securely connected to the casing so as to be located opposite to the main magnetic pole tip section, a spherical valve member movably disposed within a valve chamber which is to be filled with fuel, and defined between the main magnetic pole tip section and the valve seat member, and an adapter member securely interposed between the main magnetic pole and the casing to secure the locational relationship therebetween, thereby securely achieving the locating and centering of the main magnetic pole.

## Claims

### Claim 1

A fuel injector valve, comprising:
a casing;
a main magnetic pole securely disposed within said casing and provided with an electromagnetic coil wound thereon, said main magnetic pole being elongate and cylindrical and formed with an axial fuel passage through which fuel is supplied and a tip section;
a valve seat member securely connected to said casing so as to be located opposite to the tip section, said valve seat member being formed with a fuel injection opening through which fuel is dischargeable out of said fuel injector valve, the axis of said fuel injection opening being aligned with the axis of the fuel passage of said main magnetic pole;
a spherical valve member movably disposed within a valve chamber to be filled with fuel, said valve chamber being defined between the main magnetic pole tip section and said valve seat member, the fuel within said fuel chamber being supplied through the fuel passage of said main magnetic pole and dischargeable out of said fuel chamber through the fuel injection opening of said valve seat member; and
a side magnetic pole securely connected to said casing and located spaced around said spherical valve member, the axis of said side magnetic pole being aligned with the axis of said main magnetic pole; and
an adapter member in contact with and interposed between the main magnetic pole tip section and said casing to secure the locational relationship therebetween, said adapter member being generally annular and having inner and outer peripheral surfaces which securely contact the main magnetic pole and said casing, respectively; said adapter member including a cylindrical section containing said inner peripheral surface thereof, and a radially and outwardly extending flange section containing the outer peripheral surface thereof, said cylindrical section being fitted in a peripheral cutout section of said main magnetic pole, said flange section being fitted in a lower inner recess of said casing so that the bottom surface thereof contacts said side magnetic pole.

### Claim 2 (depends on 1)

A fuel injector valve as claimed in claim 1, wherein a closed space in which said electromagnetic coil is disposed is formed by said casing, said adapter member, said main magnetic pole, and a flange section formed with said main magnetic pole.

### Claim 3 (depends on 2)

A fuel injector valve as claimed in claim 2, wherein said adapter member and said valve seat member are made of a non-magnetic magnetic material.

### Claim 4 (depends on 3)

A fuel injector valve as claimed in claim 3, wherein said casing is made of a magnetic material and integral with said side magnetic pole.

### Claim 5

A fuel injector valve, comprising:
a casing;
a main magnetic pole securely disposed within said casing and provided with a tip section and having an electromagnetic coil wound thereon;
a valve seat member securely connected to said casing so as to be located opposite to the tip section of said main magnetic pole;
a spherical valve member movably disposed within a valve chamber to be filled with fuel, said valve member being defined between the main magnetic pole tip section and said valve seat member; and
an adapter member in contact with and interposed between the main magnetic pole tip section and said casing to secure the locational relationship therebetween, said adapter member being generally annular and having inner and outer peripheral surfaces which securely contact said main magnetic pole and said casing, said adapter member including a cylindrical section contacting the inner peripheral surface thereof, and a radially and outwardly extending flange section containing the outer peripheral surface thereof, said cylindrical section being fitted in a peripheral cutout section of said main magnetic pole, said flange section being fitted in a lower inner recess of said casing.

### Claim 6

A fuel injector valve, comprising:
a casing;
a main magnetic pole securely disposed within said casing and provided with a tip section and having an electromagnetic coil wound thereon;
a valve seat member securely connected to said casing so as to be located opposite to the tip section of said main magnetic pole;
a spherical valve member movably disposed within a valve chamber to be filled with fuel, said valve chamber being defined between the main magnetic pole tip section and said valve seat member;
a side magnetic pole securely connected to said casing and located spaced around said spherical valve member, the axis of said side magnetic pole being aligned with the axis of said main magnetic pole; and
an adapter member in contact with and interposed between the main magnetic pole tip section and said casing to secure the locational relationship therebetween, said adapter member being generally annular and having inner and outer peripheral surfaces which securely contact said main magnetic pole and said casing, respectively, said adapter member including a cylindrical section containing the inner peripheral surface thereof, and a radially and outwardly extending flange section containing the outer peripheral surface thereof, said cylindrical section being fitted in a peripheral cutout section of said main magnetic pole member, said flange section being fitted in a lower inner recess of said casing so that the bottom surface thereof contacts said side magnetic pole.