# US 10,344,727 B2 · Electromagnetic fuel injection valve for in-cylinder injection

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- Number: US 10,344,727 B2
- Document ID: US10344727B2
- Status: Granted
- Kind: B2
- Application number: 15/416,199
- Filed: 2017-01-26
- Published: 2017-09-14
- Granted: 2019-07-09
- Earliest claimed: 2016-03-10
- Assignees: Kelhin Corporation
- Applicants: Keihin Corporation
- Inventors: Michihiro Takahashi; Hironori Hashimoto
- Web page: https://patentgrep.com/patent/US10344727B2

## CPC

- F02M 61/184: {Discharge orifices having non circular sections}
- F02M 51/061: {using electromagnetic operating means}
- F02M 61/1806: {characterised by the arrangement of discharge orifices, e.g. orientation or size}
- F02M 61/1886: {Details of valve seats not covered by groups F02M61/1866 - F02M61/188}
- F02M 51/0685: {the armature and the valve being allowed to move relatively to each other or not being attached to each other}
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

In an electromagnetic fuel injection valve for in-cylinder injection, a fuel injection hole is an elongated hole having a major axis and a minor axis, the major axis being curved into an arc shape having a radius that is smaller than a radius of a pitch circle of an inlet of the fuel injection hole. Accordingly, the electromagnetic fuel injection valve can ensure a required flow rate even when a penetrating power is decreased.

## Claims

### Claim 1

An electromagnetic fuel injection valve for in-cylinder injection comprising:
a valve seat member that has a valve seat and a plurality of fuel injection holes arranged in a ring shape and that injects fuel through the fuel injection holes, and
a valve body that opens and closes the fuel injection holes in cooperation with the valve seat,
wherein each of the fuel injection holes is an elongated hole having a major axis and a minor axis, the major axis being curved into an arc shape having a radius that is smaller than a radius of a pitch circle of an inlet of each of the fuel injection holes,
each of the fuel injection holes is formed from a large diameter wall having a radius that is larger than the radius of the major axis, a small diameter wall having a radius that is smaller than the radius of the major axis, and connecting walls that connect the large diameter wall and the small diameter wall, and
at least some of the fuel injection holes are each arranged such that the major axis intersects with an inner peripheral wall of the fuel injection hole at two intersection points and one of the intersection points is present on a radially outer side of the pitch circle while the other of the intersection points is present on a radially inner side of the pitch circle.

### Claim 2 (depends on 1)

The electromagnetic fuel injection valve for in-cylinder injection according to claim 1, wherein a first imaginary circle forming the large diameter wall and a second imaginary circle forming the small diameter wall have an identical center.

### Claim 3 (depends on 1)

The electromagnetic fuel injection valve for in-cylinder injection according to claim 1, wherein all of the fuel injection holes have one of the intersection points present on the radially outer side of the pitch circle.

### Claim 4 (depends on 3)

The electromagnetic fuel injection valve for in-cylinder injection according to claim 3, wherein all of the fuel injection holes are arranged such that the minor axis is inclined toward a same side with respect to a straight line which extends in a radial direction from a center of the pitch circle and passes an intersection point between the major axis and the minor axis.