Claims
- 1. A fuel injection valve comprising:
- an injector pipe with an upper end opened and a lower end closed except an injection port, the injector pipe having a magnetic upper portion, a non-magnetic intermediate portion and a magnetic lower portion;
- a molded coil surrounding a part of an outer surface of the injector pipe, the part including the non-magnetic intermediate portion; and
- a yoke mounted on the molded coil from a lateral side of the molded coil; wherein:
- the yoke includes an opening for mounting the yoke on the molded coil from the lateral side of the molded coil, a member for positioning the yoke relative to the molded coil in its axial direction, and upper and lower connecting portions for connecting the yoke to the outer surface of the injector pipe.
- 2. A fuel injection valve as in claim 1, wherein a connector housing having a connector terminal for supplying electric current to the molded coil is molded by resin integrally with the molded coil.
- 3. A fuel injection valve as in claim 2, wherein:
- a stopper for supporting a sealing member that seals fuel fed to the fuel injection valve is molded by resin integrally with the molded coil;
- a cylindrical portion connecting the stopper and the molded coil is formed; and
- a window for receiving therein the upper connecting portion of the yoke is formed on the cylindrical portion.
- 4. A fuel injection valve as in claim 1 wherein:
- the yoke includes a pair of magnetic pieces; and
- the magnetic pieces are connected to each other by either the upper connecting portion or the lower connecting portion, thereby making the yoke an integral one piece.
- 5. A fuel injection valve as in claim 4, wherein:
- the lower connecting portion is an annular ring connecting the pair of magnetic pieces, the annular ring having an inner bore; and
- the injection pipe is inserted into the inner bore of the annular ring.
- 6. A fuel injection valve as in claim 1, wherein:
- the injector pipe is made of a compound magnetic material and formed into a single integral piece by a drawing process.
- 7. A method of manufacturing a fuel injection valve having: an injector pipe with an upper end opened and a lower end closed except an injection port, the injector pipe having a magnetic upper portion, a non-magnetic intermediate portion and a magnetic lower portion; a molded coil, which includes an inner bore, surrounding a part of outer surface of the injector pipe, the part including the non-magnetic intermediate portion; and a yoke, including an opening and a positioning member, mounted on the molded coil, the method comprising steps of:
- mounting the yoke on the molded coil from a lateral side of the molded coil through the opening of the yoke so that the yoke is positioned by the positioning member at a predetermined position on the molded coil;
- inserting the injection pipe into the inner bore of the molded coil on which the yoke is mounted; and
- connecting the yoke to the outer surface of the injector pipe.
Priority Claims (3)
Number |
Date |
Country |
Kind |
9-030402 |
Feb 1997 |
JPX |
|
9-126972 |
May 1997 |
JPX |
|
9-145674 |
Jun 1997 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims benefit of priority of Japanese Patent Applications No. Hei-9-30402 filed on Feb. 14, 1997, No. Hei-9-126972 filed on May 16, 1997, and No. Hei-9-145674 filed on Jun. 4, 1997, the contents of which are incorporated herein by reference.
Foreign Referenced Citations (2)
Number |
Date |
Country |
8-3643 |
Sep 1996 |
JPX |
WO 9111611 |
Aug 1991 |
WOX |