Solenoid operated fuel injection valve

Abstract

A solenoid operated fuel injection valve, wherein a valve element is stored in a valve housing having a magnetic cylindrical body, the front end of a non-magnetic cylindrical body surrounding a part of a movable core continuously connected coaxially with the valve element is coaxially connected to the rear end of the magnetic cylindrical body, and a fixed core is fixedly fitted to the rear part ofthe non-magnetic cylindrical body. The movable core (18) comprises a sliding tube part (18a) having an outer peripheral surface in slidable contact with the rear inner peripheral surface of the magnetic cylindrical body, a rear opposed tube part (18b) continuously connected to the rear end of the sliding tube part (18a) coaxially and integrally with each other and having an outer periphery opposedto the inner periphery of the magnetic cylindrical body (9), and a front opposed tube part (18c) having an outer periphery opposed to the inner periphery of the magnetic cylindrical body (9) and cont inuously connected to the front end of the sliding tube part (18a) coaxially and integrally with each other. Where the diameter of the rear opposed tube part (18b) is D1, the diameter of the front opposed tube part (18c) is D2, and the diameter of the sliding tube part (18a) is D3, they are set to the relation of D1 < D2 < D3. Thus, the responsiveness of the fuel injection valve for valve openingcan be increased by increasing a magnetic flux delivery efficiency between the movable core and the magnetic cylindrical body.

Description

technical field [0001] The present invention relates to an electromagnetic fuel injection valve. The electromagnetic fuel injection valve includes: a valve housing composed of a valve seat member having a valve seat, and a magnetic cylinder whose front end is coaxially connected to the valve seat member. The valve assembly is composed of a valve body and a movable iron core, and elastic force is applied to the side where the valve body is placed on the valve seat, and the valve body can be placed on the valve seat and accommodated in the valve housing , the above-mentioned movable iron core is coaxially connected with the above-mentioned valve body, and the rear end surface is used as the movable side attracting action surface; the non-magnetic cylinder, the front end of which is coaxially combined with the rear end of the above-mentioned magnetic cylinder, and The non-magnetic cylindrical body surrounds a part of the above-mentioned movable iron core; and a fixed iron core ha...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional electromagnetic fuel injection valve, the movable iron core is provided with an annular sliding contact convex portion slidingly contacting the inner surface of the non-magnetic cylinder, and the magnetic cylinder and the movable iron The side gap between the cores is relatively large, resulting in insufficient flux transmission efficiency and insufficient valve opening response.

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