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US 10,471,554 B2Granted
Fuel injector bore repair
AssigneeCaterpillar Inc.
InventorsCurtis John Graham, Robert E. Sharp, Daniel Thomas Cavanaugh, Robert Louis Brockman
Life of this patent
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Abstract
A method for remanufacturing or repairing a cylinder head having a bore configured to receive a fuel injector comprises machining a portion of a surface forming the bore to remove imperfections, inserting a repair component into the bore proximate the machined portion of the bore, and spraying material into the bore proximate the machined portion and the repair component, thereby holding the component into place.
Claims16
A cylinder head configured to receive a fuel injector comprising:
- a body defining a bore having a longitudinal axis and configured to receive a fuel injector;
- the body also defining a large diameter portion of the bore, a small diameter portion of the bore and an intermediate diameter portion of the bore disposed axially between the large diameter portion of the bore and the small diameter portion of the bore, the body further defining a machined chamfered portion extending axially from the large diameter portion of the bore to the intermediate diameter portion of the bore;
- and wherein the body further defines a machined step disposed axially between the large diameter portion of the bore and the machined chamfered portion of the bore;
- a repair sleeve inserted into the intermediate diameter portion, wherein the repair sleeve includes an annular cylindrical shape defining a cylindrical axis, a first end disposed along the cylindrical axis having a chamfered portion and a second end disposed along the cylindrical axis and also having a chamfered portion;
- and a metal material attached to the machined chamfered portion of the bore of the cylinder head and the chamfered portion of the second end of the repair sleeve, forming an undercut configured to prevent removal of the repair sleeve.
2 more elements
A cylinder head assembly comprising:
- a cylinder head configured to receive a fuel injector comprising:
- a body defining a bore having a longitudinal axis and configured to receive a fuel injector;
- the body also defining a large diameter portion of the bore, a small diameter portion of the bore and an intermediate diameter portion of the bore disposed axially between the large diameter portion of the bore and the small diameter portion of the bore, the body further defining a machined chamfered portion extending axially from the large diameter portion of the bore to the intermediate diameter portion of the bore;
- wherein the body further defines a machined step disposed axially between the large diameter portion of the bore and the machined chamfered portion of the bore;
- a repair sleeve inserted into the intermediate diameter portion, wherein the repair sleeve includes an annular cylindrical shape defining a cylindrical axis, a first end disposed along the cylindrical axis having a chamfered portion and a second end disposed along the cylindrical axis and also having a chamfered portion;
- a metal material attached to the machined chamfered portion of the bore of the cylinder head and the chamfered portion of the second end of the repair sleeve, forming an undercut configured to prevent removal of the repair sleeve;
- and a fuel injector disposed in the bore of the cylinder head.
4 more elements
A method for remanufacturing or repairing a cylinder head having a bore configured to receive a fuel injector, the method comprising:
- machining a portion of a surface forming the bore in a body of the cylinder head to remove imperfections, the body having each of a large, a small, and an intermediate diameter portion of the bore, the intermediate diameter portion disposed axially between the large and small diameter portions, and the body further having a machined chamfered portion extending axially from the large diameter portion to the intermediate diameter portion, and a machined step disposed axially between the large diameter portion and the machined chamfered portion of the bore;
- inserting a repair sleeve component into the intermediate diameter portion of the bore proximate the machined portion of the bore, the repair sleeve including an annular cylindrical shape defining a cylindrical axis, a first end disposed along the cylindrical axis having a chamfered portion and a second end disposed along the cylindrical axis and also having a chamfered portion;
- and spraying metal material into the bore proximate the machined portion and the repair component, to attach the machined chamfered portion of the bore of the cylinder head to the chamfered portion of the second end of the repair sleeve component and forming an undercut preventing removal of the repair sleeve.
Dependencies are inferred from the claim text.