Caterpillar Inc.

Patrick W Savage, Jr

Curtis John Graham

Trent A Simpson

Adam William Ostein

Jarrod David Moss

Benjamin C Thomas

Daniel Richard Ibrahim

James Richard Weber

Eric Charles Fluga

A method of refurbishing a camshaft () having at least one defective portion () includes removing material from the at least one defective portion () to create a neck region (). An alignment feature () is introduced in the neck region () according to a previous orientation of the defective portion (). A segmented blank () is installed around the neck region () and oriented with the alignment feature ().

Refurbished camshaft and method

A method of refurbishing a camshaft () having at least one defective portion () includes removing material from the at least one defective portion () to create a neck region (). An alignment feature () is introduced in the neck region () according to a previous orientation of the defective portion (). A blank () is installed around the neck region () and oriented with the alignment feature ().

A fuel injector for a fuel system is disclosed. The fuel injector has a nozzle member and a needle valve member slidingly disposed with the nozzle member. The nozzle member has a tip portion, at least one orifice disposed at the tip portion, a base portion, and a female conical seating surface disposed at the base portion. The needle valve member has a tip end configured to selectively restrict fuel flow through the at least one orifice, a base end, and a male conical seating surface disposed between the tip end and the base end. The male conical seating surface is configured to engage the female conical seating surface to restrict fuel flow through the at least one orifice and has a hydraulic surface area greater than a hydraulic surface area of the base end of the needle valve member.

Fuel injector

An exhaust system for receiving exhaust gas of an engine is provided. The exhaust system comprises a cooler configured to cool at least a portion of exhaust gas, a pressure sensor configured to measure an exhaust pressure drop across the cooler, and a controller configured to determine exhaust flowrate as a function the measured pressure drop across the cooler. Also provided is a method for operating an engine. The method comprises the steps of combusting a fuel and air mixture, exhausting at least some of the combusted fuel and air mixture as exhaust gas to an exhaust system of an engine, cooling at least some of the combusted exhaust gas in a cooler, measuring pressure drop of the exhaust gas across the cooler, and determining a flowrate of the exhaust gas across the cooler as a function of pressure drop.

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Chillicothe, IL, United States of America

Patrick W Savage, Jr