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US 10,989,155 B2Granted
Method of retarding injection timing of a fuel injector
AssigneeProgress Rail Services Corporation
InventorRolando Lopez
Life of this patent
Estimating the term…
Abstract
A method comprises determining either the coefficient for the equation relating the injection timing distance of a bushing to the angle of rotation of a shaft of an engine, or the desired effective injection stroke reduction; and calculating at least one of the following: the modified injection timing distance by multiplying the desired angle of retardation of the injection timing by the coefficient and adding that product to the original injection timing distance of the bushing, and the modified injection duration distance by subtracting the desired effective injection stroke reduction from the original injection duration distance.
Claims11
A bushing for use with a fuel injector, the bushing comprising:
- a substantially cylindrical body defining a cylindrical axis, an upper end, and a lower end disposed along the cylindrical axis, the body including a main body portion disposed proximate the lower end and a necked down portion disposed proximate the upper end with a shoulder connecting the necked down portion to the main body portion;
- the body also defining a central bore extending completely through the body from the upper end to the lower end along the cylindrical axis;
- the main body portion including an outer circumferential surface;
- the main body portion defining a top port extending from the outer circumferential surface to the central bore, the top port forming a bottom inside portion at the intersection of the top port with the central bore;
- and
- the main body portion defining a bottom port extending from the outer circumferential surface to the central bore, the bottom port forming a top inside portion at the intersection of the bottom port with the central bore;
- wherein the main body portion defines an injection timing distance measured along the cylindrical axis from the shoulder to bottom inside portion of the top port, and the main body portion defines a main body height measured along the cylindrical axis from the shoulder to the lower end, and a ratio of the main body height to the injection timing distance ranges from 1.9 to 2.2;
- the main body portion defines an injection duration distance measured along the cylindrical axis from the bottom inside portion of the top port to the top inside portion of the bottom port and a ratio of the main body height to the injection duration distance ranges from 4.0 to 4.4;
- the bushing defines an overall injection adjustment ratio that equals the ratio of the injection timing distance to the injection duration distance, and this ratio ranges from 1.9 to 2.250;
- and
- the main body height is from 2.7 inches to 3.0 inches.
8 more elements
A fuel injector assembly comprising:
- a housing that defines a pressurized fuel chamber;
- a check valve assembly in fluid communication with the pressurized fuel chamber;
- a plunger disposed in the housing;
- a bushing disposed in the housing configured to guide the movement of the plunger;
- wherein the bushing includes
- a substantially cylindrical body defining a cylindrical axis, an upper end, and a lower end disposed along the cylindrical axis, the body including a main body portion disposed proximate the lower end and a necked down portion disposed proximate the upper end with a shoulder connecting the necked down portion to the main body portion;
- the body also defining a central bore extending completely through the body from the upper end to the lower end along the cylindrical axis;
- the main body portion including an outer circumferential surface;
- the main body portion defining a top port extending from the outer circumferential surface to the central bore, the top port forming a bottom inside portion at the intersection of the top port with the central bore;
- and
- the main body portion defining a bottom port extending from the outer circumferential surface to the central bore, the bottom port forming a top inside portion at the intersection of the bottom port with the central bore;
- wherein the main body portion defines a main body height measured along the cylindrical axis from the shoulder to the lower end and defines an injection duration distance measured along the cylindrical axis from the bottom inside portion of the top port to the top inside portion of the bottom port and a ratio of the main body height to the injection duration distance ranges from 4.0 to 4.4;
- the main body portion defines an injection timing distance measured along the cylindrical axis from the shoulder to bottom inside portion of the top port and a ratio of the main body height to the injection timing distance ranges from 1.9 to 2.2;
- the bushing defines an overall injection adjustment ratio that equals the ratio of the injection timing distance to the injection duration distance, and this ratio ranges from 1.9 to 2.250;
- and
- the main body height is from 2.7 inches to 3.0 inches.
13 more elements
Dependencies are inferred from the claim text.