초록 ▼

A method and fuel injector for precision setting of valve lift, using a valve body shell (42) telescoped over the valve body (60), the shell (42) having a nonmagnetic extension welded to the valve body shell (42) and to the end of an inlet tube (16) providing a solenoid pole piece, with the valve bo

A method and fuel injector for precision setting of valve lift, using a valve body shell (42) telescoped over the valve body (60), the shell (42) having a nonmagnetic extension welded to the valve body shell (42) and to the end of an inlet tube (16) providing a solenoid pole piece, with the valve body (60) and shell (42) adjusted to set the valve lift and thereafter welded together. Interference fit portions stabilize the adjusted position of the members preparatory to welding, and displaced material in a locking groove (102) creates a mechanical interlock between the valve body (60) and shell (42) to stabilize the members in their adjusted positions after welding so that the set lift is minimally affected by weld shrinkage. An external radial groove 18 allows radial bending as the weld cools to minimize axial shift of the parts and thus the effect on the set valve lift.

대표청구항 ▼

[ What is claimed is:] [1.] A method of setting a desired valve lift in a fuel injector for internal combustion engines, the fuel injector having a needle valve armature assembly slidable in a bore in a valve body member, a valve seat fastened in an end of the valve body member and engaged by a tip

[ What is claimed is:] [1.] A method of setting a desired valve lift in a fuel injector for internal combustion engines, the fuel injector having a needle valve armature assembly slidable in a bore in a valve body member, a valve seat fastened in an end of the valve body member and engaged by a tip of the needle valve, the armature having an end face movable into abutment against an end face of a pole piece of a solenoid operator upon energization of the solenoid operator, the movement of the armature carrying the needle valve tip off the valve seat and defining the valve lift, the method comprising the steps of:fitting a valve body shell member over the valve body member so as to allow telescoping movement therebetween;fixing said valve body shell member relative to the pole piece;telescoping the valve body member into the valve body shell member and measuring their relative position to determine when a set position corresponding to the desired valve lift is reached; and then interferingly fitting portions of said members so as to cause displacement of material from one member as said members are telescoped together to create a mechanical interlock therebetween.