Patent ID: 6546916
Filing Date: 2003-04-15
Classification: F02D,F02M

Abstract:
A mechanism for a fuel injection pump for adjustably advancing and retarding the timing of fuel injection to an internal combustion engine in response to engine operating parameters, the fuel injection pump having a movable peg for varying the angular position of a cam ring, the mechanism comprising:a housing having a first bore and having a first axis; a first piston slidably disposed in said first bore in engagement with said peg, said first piston having a second bore coaxial with said first bore; a second piston slidably disposed in said first bore, said second piston having a piston portion extending into said second bore, and said second piston defining a first surface, said second piston being slidably responsive to at least one of said engine operating parameters; an adjusting means disposed, at least in part, within said housing for varying an axial rest position of said second piston with respect to said housing corresponding to a limit of travel thereof, wherein the adjusting means defines a stop surface which is engageable with the first surface of said second piston to fix a first axial position of said second piston and thereby to set the timing datum for the fuel injection pump; and first control spring means disposed in compression against said second piston for urging said second piston toward said first piston.