Patent ID: 6434822
Filing Date: 2002-08-20
Classification: F02M,Y10T

Abstract:
A method of assembly of a fuel injector having a valve plunger reciprocable in a guide tube for movement from a closed position engaging a valve seat to an open position engaging a valve stop by energizing of a solenoid coil to move the plunger against a biasing spring, said method comprising:installing the plunger in the guide tube in engagement with one of the valve seat and a reference member; installing the valve stop in the guide tube and setting a predetermined gap between the valve stop and the normally closed position of the plunger to establish a desired valve stroke; laser spot welding the valve stop in the guide tube to maintain the set gap; and laser seam welding the valve stop in the guide tube at an axial location beyond the spot welds, relative to a plunger-engagable end of the valve stop, to provide a hermetic seal around the valve stop.