| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a spring retaining member pressed into a fixed core to stabilize the outer diameter dimension of the spring retaining member and adjust the axial position very accurately, preventing a cutting chip from occurring, in an electromagnetic fuel injection valve where a return spring which urges a valve assembly to the side so as to seat a valve body to a valve seat is compressedly set between the valve assembly where the cylindrical spring retaining member having a slit extending axially and the spring retaining member is pressed into a cylindrical fixed core surrounded by the coil assembly, and a movable core and the valve body opposite to the fixed core are coaxially combined. SOLUTION: There are successively carried out a first process to prepare a bar workpiece 52 having an axially extending groove 51 at the circumference, and extending longer than the spring retaining member 27, a second process to bore the bar workpiece 52 so as to form a coaxialy through-hole 53 opening the inner end side of the groove 51 inside, and a third process to cut off the bar workpiece 52 so as to cut by the length corresponding to the spring retaining member 27. COPYRIGHT: (C)2006,JPO&NCIPI
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