External stroke/flow setting method for fuel injectors
AssigneeDelphi Technologies, Inc.
InventorRobert B. Perry
Life of this patent
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Abstract
A method for externally adjusting the axial length of a solenoid actuated fuel injector includes the step of externally forming a helical scribe mark in a housing component, thereby changing the axial length of the injector. By adjusting the length of the helical scribe mark and the depth of the scribe mark, and by measuring the stroke or the flow rate of the injector, the stroke or the flow rate of injector may be set precisely. The external adjustment of the length of the housing component may be made in cartridge form as well as in final assembly form of the fuel injector complementing the manufacturing process versatility.
Claims23
A method for externally adjusting an axial length of a tubular housing of a solenoid actuated fuel injector, comprising the step of:
- forming a helical scribe mark on an external surface of said housing thereby increasing the axial length of said housing component proportional to a portion of a residual stress contained within said housing.
A method for externally setting a valve stroke of a solenoid actuated fuel injector, comprising the steps of:
- forming a tubular lower housing enclosing a valve assembly of said fuel injector;
- scoring a helical scribe mark in an external surface of said lower housing with a tool, thereby increasing an axial length of said lower housing;
- measuring said valve stroke of said fuel injector;
- and
- stopping formation of said helical scribe mark when a desired valve stroke is reached.
A method for externally setting a static flow of a solenoid actuated fuel injector, comprising the steps of:
- forming a tubular lower housing enclosing a valve assembly of said fuel injector;
- assembling said fuel injector including said lower housing enclosing said valve assembly;
- flowing fuel through said assembled fuel injector;
- forming a helical scribe mark in an external surface of said lower housing with a tool;
- measuring a flow rate of said fuel flowing through the fuel injector;
- and
- stopping formation of said helical scribe mark when a desired flow rate is reached.
Dependencies are inferred from the claim text.