Keihin Corporation

Ryuji Aoki

Atsushi Kamahora

Akira Arioka

Daisuke Sato

Junichi Miyashita

Ryohei Kimura

Yuya Ohgane

Toshikazu Sakai

A valve seat has a fixing portion fixed to the body, an abutting portion where the suction valve body abuts, and a constricted portion which is provided between the fixing portion and the abutting portion and has rigidity lower than that of the fixing portion and the abutting portion.

Fuel pump

In an electromagnetic fuel injection valve in which: a suction tubular part projecting toward an inside of a nonmagnetic cylindrical body is provided to a front end portion of a stationary core; and a front end of the suction tubular part and a rear end of a movable core are opposed to each other in the inside of the nonmagnetic cylindrical body, an annular gap allowing influx of pressure fluid used for a check of liquid-tightness between the nonmagnetic cylindrical body and the stationary core is provided between an outer peripheral surface of the suction tubular part and an inner peripheral surface of the nonmagnetic cylindrical body. Accordingly, it enables a quick and efficient judgment to be made on a check on liquid-tightness of a welded part by applying fluid pressure to the inside of the valve housing after the valve housing of the electromagnetic fuel injection valve is produced.

Electromagnetic fuel injection valve and method of manufacturing the same

A valve assembly including a valve element and a movable core is housed in a valve housing including a valve seat member, a magnetic cylinder, a nonmagnetic collar and a stationary core. A coil assembly is disposed on an outer periphery of the stationary core, and housed in a coil housing. The coil housing has a front end wall part which is formed such that a thickness thereof in an axial direction is larger than a thickness of its shell part in a radial direction. A magnetic path forming part is formed by the front end wall part and a rear-side cylinder part of the magnetic cylinder which is fitted to an inner peripheral surface of the front end wall part. The magnetic path forming part surrounds the movable core substantially by the entirety of its inner peripheral surface to magnetically connect the movable core and the shell part to each other. A positioning step part is formed at a rear end of the magnetic cylinder so as to support a front end of the magnetic assembly. Thus, it is possible to prevent magnetic flux saturation from occurring in the front end wall part of the coil housing, thereby improving characteristics of attraction force between the stationary core and the movable core and also stabilizing the characteristics of the attraction force.

Electromagnetic field injection valve

A fuel injection valve is provided that includes a valve seat member () having a conical valve seat () and a valve hole () formed through a central part of the valve seat (), a valve body () working in cooperation with the valve seat (), and an injector plate () joined to the valve seat member () and having a plurality of fuel injection holes () radially outwardly displaced from the valve hole (), a diffusion chamber () providing communication between the valve hole () and the fuel injection holes () being provided between the valve seat member () and the injector plate (), wherein the diffusion chamber () formed between the valve seat member () and the injector plate () is in an annular shape, has a diameter that is larger than that of the valve hole (), and has inner ends of the fuel injection holes () opening therein, and a plurality of fuel passages () are disposed within the valve hole (), the plurality of fuel passages () reversing within the valve hole () fuel that has passed through the valve seat () and guiding the fuel to the diffusion chamber (). This enables atomization of injected fuel to be promoted and penetrability to be improved for the fuel injection valve.

Fuel injection valve

In a fuel injection valve, a fuel guide member facing the valve hole is connected to an injector plate, and an annular diffusion chamber is formed between a valve seat member and the injector plate. A pair of first notches, a pair of second notches, and a plurality of closing parts are formed in an outer periphery of the fuel guide member. The first notches are arranged on a first diameter line of the valve hole. The second notches are arranged on a second diameter line perpendicular to the first diameter line. The closing parts are provided between the first and second notches to partially close the valve hole. A plurality of fuel injection holes are dispersally arranged in outside regions corresponding to the closing parts and inside regions corresponding to the first notches. A first tip end corner of the closing part adjacent to the first notch is formed into an edge shape or a minute arc shape, while a second tip end corner of the closing part adjacent to the second notch is formed into a large arc shape. Thus, it is possible to reduce a particle size of injected fuel and improve penetrability.

Growing community of inventors

Miyagi, Japan

Ryuji Aoki