Variable shim for setting stroke on fuel injectors

Details Variable shim for setting stroke on fuel injectors Variable shim for setting stroke on fuel injectors

2011-03-01

2011-03-01

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Valve or choke making

C029S890120, C029S890131, C239S585100, C251S129150, C251S359000

Reexamination Certificate

active

07895751

ABSTRACT:
A variable shim and valve seat assembly for applications in a solenoid actuated fuel injector includes a variable shim having a face, a valve seat having a top surface that interfaces with the face, and mating features integrated in the face of the variable shim and the top surface of the valve seat. The mating features provide axial displacement of the valve seat through rotation of the valve seat relative to the variable shim. The mating features may be ramped surfaces. The amount of seat displacement is dependent on the designed ramp angle, the number of ramps, and the degree of rotation. Once the desired valve stroke is set, the seat is welded to the injector body to achieve a leak free interface. Tight stroke setting tolerances can be achieved by applying an axial load to the seat during stroke setting and welding.

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patent: 6032630 (2000-03-01), Yamamoto et al.
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patent: 3540660 (1987-05-01), None
patent: 19533290 (1996-03-01), None
patent: 19958705 (2001-06-01), None
EP Search Report dated Oct. 14, 2009.

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