VALVE GUIDE INSERT WITH FRICTIONAL PRE-BROACH RETENTION FEATURE

摘要

A valve guide insert for lining and relining a valve guide bore in an internal combustion engine includes a one-piece, thin-walled, cylindrically-shaped metallic tube made from reformable bearing material having first and second ends and an intermediate portion. An inwardly tapered portion is disposed at the first end, wherein an end diameter of the inwardly tapered portion is less than an outer diameter of a valve guide bore, and wherein the outer diameter of the intermediate section is greater than an inner diameter of a valve guide bore. A longitudinal slit is included having a stepped portion along a length of the longitudinal slit. An interference portion is disposed proximate the second end, wherein the interference portion is configured to substantially secure the valve guide insert within a valve guide bore.

主权项

1. A valve guide insert for lining and relining a valve guide bore in an internal combustion engine having a valve with a valve stem, the valve guide bore being configured to support the valve stem for reciprocal motion, the valve guide insert comprising:
a one-piece, cylindrically-shaped metallic tube made from reformable bearing material having first and second ends and an intermediate portion extending between the first and second ends; a longitudinal slit disposed along the length of the valve guide insert; an inwardly tapered portion disposed at the first end, wherein a first outer diameter of the inwardly tapered portion is less than an inner diameter of a valve guide bore, and wherein a second diameter of the intermediate section is greater than an inner diameter of a valve guide bore; and an interference portion disposed proximate the second end, wherein the interference portion is configured to substantially secure the valve guide insert within a valve guide bore.