| 摘要 |
An electromagnetic fuel injection valve is provided in which a valve body is housed in a valve housing having a cylindrical magnetic body, the front end of a cylindrical non-magnetic body surrounding a part of a movable core coaxially connected to the valve body is connected coaxially to the rear end of the cylindrical magnetic body, and a fixed core is fitted into and fixed to a rear portion of the cylindrical non-magnetic body, wherein the movable core (18) includes a tubular sliding portion (18a) having an outer peripheral face that is in sliding contact with an inner peripheral face of a rear portion of the cylindrical magnetic body, a rear tubular opposing portion (18b) that is connected coaxially and integrally to the rear end of the tubular sliding portion (18a) and has the outer periphery thereof facing the inner periphery of the cylindrical magnetic body (9), and a front tubular opposing portion (18c) that has the outer periphery thereof facing the inner periphery of the cylindrical magnetic body (9) and is connected coaxially and integrally to the front end of the tubular sliding portion (18a), and when the diameter of the rear tubular opposing portion (18b) is D1, the diameter of the front tubular opposing portion (18c) is D2, and the diameter of the tubular sliding portion (18a) is D3, they are set so that D1<D2<D3. This enables the efficiency of passing magnetic flux between the movable core and the cylindrical magnetic body to be enhanced and the valve-opening responsiveness to be improved.
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