Mitsubishi Electric Corporation

Keishi Nakano

Tsuyoshi Munezane

Naoya Hashii

Akio Shingu

Manabu Miyaki

Atsushi Yoshimura

A fuel injection valve in which a valve element is formed at a distal end thereof with a flat portionwhich is substantially parallel with an injection hole plate, injection hole entrancesare arranged inside an imaginary envelopalong an intersection between an extensionof a downstream inner wall of a seat portion of a valve seat and an upstream planeof the injection hole plate and outside the flat plane at the distal end of the valve element, and the relation between the vertical distance h between the flat plane at the distal end of the valve element and the upstream plane of the injection hole plate with the valve opened and the diameter d of the injection hole entrance is h&#x3c;d, and the injection holeis formed to be inclined by a predetermined angle with respect to the direction of the thickness of the injection hole plate.

Fuel injection valve

An object of the present invention is to prevent a short circuit and disconnection between coil wiresin a crossing portionin a solenoid deviceof a fuel injection valvethat has a structure in which the coil wiresintersect with each other on a winding initiation sideand a winding completion sideof the coil wires A groove that is deeper in depth than the coil wireis disposed in a bobbin, around which the coil wireis wound, and the winding initiation side and the winding completion side of the coil wire is separated into upper and lower stages of a groove portion in the crossing portion.

Electromagnetic fuel injection valve

A fuel injection valve includes a solenoid device which generates a magnetic sucking force; a core provided inside the solenoid device; a movable valve element composed of an armature coming into contact with the core, a pipe section whose one end is joined to the armature, and a valve section joined to the other end of the pipe section, the valve element being suctioned against a spring during energization of the solenoid device; and a valve seat unit having a valve seat to or from which the valve element is mounted or removed by the magnetic sucking force generated from the solenoid device and pressing force of the spring. The armature, the valve section, and the pipe section of the valve element are integrally configured by molding with resin, the armature and the valve section being joined by the pipe section.

Fuel injection valve and method of manufacturing the same

A fuel injection valve has a valve body for opening and closing a valve seat, and receives an operation signal from a control unit to operate the valve body so that fuel is injected from a plurality of injection holes formed in an injection hole plate welded through a welded portion to a downstream side of the valve seat while passing through a gap between the valve body and the valve seat. The injection hole plate is formed at its central portion with a convex portion which is substantially axisymmetric with respect to a valve seat axis and which has a circular-arc shaped cross section, and the welded portion is also substantially axisymmetric with respect to the valve seat axis. Inlet portions of the injection holes are disposed in an injection hole arrangement surface diametrically outside of the convex portion and diametrically inside of a valve seat opening inner wall which is a minimum inside diameter of the valve seat, and the injection hole arrangement surface is coplanar with a surface having the welded portion.

This invention serves to suppress the deterioration of oil tightness of a valve after welding without any change in the direction of fuel injection even with deformation of a convex portion after welding of an injection opening plate to a valve seat, as well as without any variation in the direction of fuel injection due to welding variation. In this invention, in a fuel injection valve which has a valve body for opening and closing a valve seat, and receives an operation signal from a control unit to operate the valve body so that fuel is injected from a plurality of injection holes formed in an injection hole plate welded through a welded portion to a downstream side of the valve seat while passing through a gap between the valve body and the valve seat, said injection hole plate is formed at its central portion with a convex portion which is substantially axisymmetric with respect to a valve seat axis and which has a circular-arc shaped cross section, and said welded portion is also substantially axisymmetric with respect to said valve seat axis. In addition, inlet portions of said injection holes are disposed in an injection hole arrangement surface diametrically outside of said convex portion and diametrically inside of a valve seat opening inner wall which is a minimum inside diameter of said valve seat, and said injection hole arrangement surface is coplanar with a surface having said welded portion.

Growing community of inventors

Chiyoda-ku, Japan

Keishi Nakano