Caterpillar Inc.

Other

Sami I El-Sayed

Karen Renee Raab

James D Sparks

Scott A Johnston

Avtar S Sandhu

Howard D Jenkel

Paul May

A method of manufacturing a fuel injector having high-flow orifices in its tip includes removing a bulb from a fuel injector tip having at least one spray orifice with a first diameter, and friction welding a slug to the fuel injector tip, including forming a fused interface of material of the slug and material of the fuel injector tip. The method further includes modifying the slug subsequent to friction welding the slug to the fuel injector tip, including forming a new bulb from the slug having at least one spray orifice therein with a different diameter than that of the removed bulb. A remanufactured fuel injector, and fuel injector tip, includes an injector tip body having a first tip portion of a first material and a second tip portion of a material compatible for friction welding with the first material. The injector tip body further includes a third tip portion attaching the first tip portion to the second tip portion, the third tip portion including a friction weld formed during remanufacturing of the fuel injector tip.

Remanufactured fuel injector tip and fuel injector tip remanufacturing process

An improved method for salvaging a spring element with a degraded force constant for return to a work environment. The spring element is subjected to a high temperature and extended duration annealing treatment alone or in combination with other treatments. The resultant salvaged spring is characterized by a more durable force constant relative to the original spring when it was new.

Salvage process for spring elements

A compression spring assembly is disclosed herein. The compression spring assembly may be used in a fuel injection device and may include a compression spring having first and second adjacent turns spaced apart by a distance. The compression spring assembly may further include a damping element arranged between the first and second turns and having first and second spaced apart support regions separated by an arched third support region. The first and second support regions may be configured to exert force on a surface of the first turn, and the third support region may be configured to exert force on a surface of the second turn to at least inhibit movement of the first turn toward the second turn during operation of the spring.

Self damping compression spring assembly for a fuel injection device

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Bloomington, IL, United States of America

Sami I El-Sayed