Hitachi Automotive Systems, Ltd.

Ryuta Kinoshita

Nobuaki Kobayashi

Takahiro Saito

Masaki Nagaoka

A fuel injection valve includes: a valve seat member to which the valve seat is formed; a welding portion between the valve seat member and the cylindrical member, which is provided on the base end side of the stepped surface, the valve seat member being assembled to be press-fit in the cylindrical member so that a tip end side abutment pressure between an inner circumference surface of the cylindrical member, and a tip end side outer circumference surface portion of the valve seat member which is on the tip end side of the stepped surface is smaller than a base end side abutment pressure between the inner circumference surface of the cylindrical member, and a base end side outer circumference surface portion of the valve seat member which is on the base end side of the stepped surface portion.

Fuel injection valve

Disclosed is a fuel injection valve comprising: a fuel injection orifice provided in a downstream side of a valve seat which a valve body moves toward and away from; a swirl chamber having a swirl passage formed around the entry opening of the fuel injection orifice; and a transverse passage whose end is opened in an inner circumferential wall of the swirl chamber in order to provide a fuel into the swirl chamber, wherein a center of the entry opening is shifted from a first position where the velocity component in the swirl direction of the fuel can be maximized to a second position where the velocity component in the swirl direction is reduced, and where a velocity component in a center axis direction of the fuel injection orifice is enhanced. Thereby, it is possible to easily adjust a fuel injection amount and a spray angle.

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Mito, Japan

Ryuta Kinoshita