摘要 |
An electromagnetic fuel injection valve is provided in which a cylindrical magnetic body is welded to a valve seat member having at the rear end thereof a tubular press-fit portion press-fitted into a front portion of the cylindrical magnetic body, a valve body is housed in the valve seat member while being spring-biased in a direction that seats the valve body on a valve seat, and a movable core facing a fixed core is coaxially connected to the valve body, wherein the valve seat member ( 10 ) includes the tubular press-fit portion ( 10 a), a large diameter portion ( 10 b) that has substantially the same outer diameter as the outer diameter of the cylindrical magnetic body ( 9 ), and an annular shoulder portion ( 10 c) that is formed as a flat face perpendicular to the outer peripheral face of the tubular press-fit portion ( 10 a) and provides a connection between the tubular press-fit portion ( 10 a) and the large diameter portion ( 10 b), an annular abutment receiving face ( 9 a) at the front end of the cylindrical magnetic body ( 9 ) is formed so as to define a right angle relative to the inner peripheral face of the cylindrical magnetic body ( 9 ), the annular abutment receiving face ( 9 a) abutting against the annular shoulder portion ( 10 c) over substantially the entire face, and the front end of the cylindrical magnetic body ( 9 ) and the abutment portion of the valve seat member ( 10 ) are welded together along the entire periphery. This enables the thickness of the cylindrical magnetic body to be reduced, thus making it small and improving the responsiveness.
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