Patent attributes
A process for producing an electromagnetic fuel injection valve is provided, the electromagnetic fuel injection valve having a structure in which a valve assembly formed by coaxially joining a movable core and a valve body is spring-biased toward the side on which the valve assembly is seated on a valve seat while restricting an end thereof that is in proximity to a fixed core, and in the process a first distance (L1) between the front end of the fixed core (22) and the front end of a cylindrical magnetic body (9) is measured, a stopper (28) and the movable core (18) are formed so that a second distance (L2) between an annular shoulder portion (10c) of a valve seat member (10) and the rear end of the stopper (28) projecting by a predetermined amount from the rear end of the movable core (18) in a state in which the valve seat member (10) and the valve assembly (17) are held coaxially is smaller than the first distance (L1) by a desired value, and the cylindrical magnetic body (9) and the valve seat member (10) are butt-welded in a state in which a tubular press-fit portion (10a) is press-fitted into a front portion of the cylindrical magnetic body (9) until the annular shoulder portion (10c) abuts against the front end of the cylindrical magnetic body (9). This enables the stroke of the valve body to be adjusted easily while reducing the cost, and the valve seat member and the cylindrical magnetic body to be joined while enhancing the coaxial precision.
