Fuel injection pump timing mechanism
AssigneeDelphi Technologies, Inc.
InventorDaniel Jeremy Hopley
Life of this patent
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Abstract
A mechanism for advancing and retarding the injection timing of a mechanically-actuated fuel injection pump. The mechanism includes a housing having a bore slidably receivable of an advance piston which cooperates with a lever of the fuel injector timing mechanism. A light load piston also in the bore cooperates with the advance piston to permit adjustment of timing under light load conditions. A rotatable cam mechanism cooperates with a flange on the light-load piston to set the axial rest position of the light-load piston and the advance piston, and hence the datum timing of the fuel injection pump. The cam may be easily set by external adjustment.
Claims17
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.
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, said second piston including a light load piston having a third bore, a third piston slidably disposed in said third bore and said second bore;
- and
- 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.
A fuel injection pump comprising a mechanism for adjustably advancing and retarding the timing of fuel injection 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 including:
- 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 as 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.
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;
- and
- 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;
- wherein said adjusting means comprises an adjustable datum-setting mechanism having rotatable eccentric means which define said stop surface, said eccentric means being rotatable about a second axis orthogonal to said first axis.
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, a circumferential flange surface defined by said second piston, said second piston being slidably responsive to at least one of said engine operating parameters;
- and
- 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 circumferential flange surface to fix a first axial position of said second piston and thereby set the timing datum for the fuel injection pump.
Dependencies are inferred from the claim text.