Gear box valve housing repair
AssigneeUNC Artex, Inc.
InventorElmer A. Stockton
Life of this patent
Estimating the term…
Abstract
In many complicated castings, such as those utilized to define a gear box for an aircraft jet engine, valve housings or mounting recesses may be integrally formed in the casting. Such housings incorporate a plurality of sealing surfaces which cooperate with a valve mounted therein. The repair of such sealing surfaces when worn is accomplished by machining out all bearing surfaces to a substantially larger diameter, then inserting a sleeve element which fits snugly in the newly machined bore and defines a plurality of sealing surfaces dimensionally identical with the original sealing surfaces formed in the housing.
Claims4
A method of repairing a cylindrical cavity in a housing, said cavity having an original bore with a worn internal cylindrical sealing surface and a radial fluid port opening into said cylindrical sealing surface, comprising the steps of:
- machining said cavity to substantially enlarge the diameter thereof and to form internal threads in at least one end of the enlarged cylindrical cavity;
- forming a sleeve having an external surface snugly insertable in said enlarged cylindrical cavity and having external threads engagable with said internal threads, said sleeve having an internal bore dimensionally conforming to the diameter of the original bore of said cylindrical cavity;
- forming a pair of O-ring grooves around the circumference of said sleeve;
- mounting an O-ring seal in each O-ring groove of said sleeve;
- forming a radial bore in said sleeve intermediate said O-ring seals, the radial bore extending from the exterior of the sleeve to the internal bore of the sleeve;
- inserting said sleeve in said cylindrical cavity and threadably engaging said internal and external threads to secure said sleeve in said cylindrical cavity with said O-ring seals straddling said radial port, thereby providing fluid communication between said radial port and the internal bore of said sleeve, and duplicating the original configuration of said cylindrical cavity.
A method of repairing a cylindrical cavity in a housing, said cavity having an original bore with a worn internal cylindrical sealing surface and a radial fluid port opening into said cylindrical sealing surface, comprising the steps of:
- machining said cavity to substantially enlarge the diameter thereof and to form internal threads in an outer end of the enlarged cylindrical cavity;
- forming a sleeve having an external surface snugly insertable in said enlarged cylindrical cavity and having external threads engagable with said internal threads, said sleeve having an internal bore dimensionally conforming to the diameter of the original bore of said cylindrical cavity;
- forming a pair of O-ring grooves around the circumference of said sleeve;
- mounting an O-ring seal in each O-ring groove of said sleeve;
- forming a radial bore in said sleeve intermediate said O-ring seals, the radial bore extending from the exterior of the sleeve to the internal bore of the sleeve;
- inserting said sleeve in said cylindrical cavity and threadably engaging said internal and external threads to secure said sleeve in said cylindrical cavity with said O-ring seals straddling said radial port, thereby providing fluid communication between said radial port and the internal bore of said sleeve, and duplicating the original configuration of said cylindrical cavity.
Dependencies are inferred from the claim text.