Valve guide insert
AssigneeMack Trucks, Inc.
InventorWinton J. Pelizzoni
Life of this patent
Estimating the term…
Abstract
A valve guide insert for placement in a valve guide of an internal combustion engine to guide a valve stem of the typical valve assembly while minimizing the valve insert wear. The valve guide insert may be a cast iron or other metal sleeve assembly having a port end and a spring end with a ring made of carbide, stellite, bonded metal or other wear-resistant material positioned inside the sleeve in the vicinity of the port end for engaging the valve stem during reciprocation. The ring can be a separate element retained within a recess of the sleeve, or a metal bonded onto a roughened portion of the sleeve and refinished to form a one-piece insert.
Claims18
A valve guide insert for lining a valve guide of an internal combustion engine comprising a metallic, tubular sleeve having a spring end and a port end, said sleeve having an outer surface adapted to fit within the valve guide of the internal combustion engine and a length of an inner surface for receiving a valve stem, a major portion of the length of the inner surface of said insert being of a metal of good heat conductivity, and a minor portion of the length of the inner surface of said insert disposed only at said port end being metal of greater wear-resistance than the metal of the remainder of said sleeve, and said minor portion comprising a material selected from the class consisting of heavy metal carbide and stellite.
A valve guide insert for lining a valve guide of an internal combustion engine comprising a metallic, tubular sleeve having a spring end and a port end, the metal of said sleeve having high thermal conductivity, said sleeve having an outer surface adapted to fit within the valve guide of the internal combustion engine and a length of an inner surface to receive a valve stem;
- said sleeve having a first component extending over a major portion of the length of the inner surface and a second component extending over a minor portion of the length of the inner surface, said first component being a metal of good heat conductivity, said second component of said sleeve comprising a metal ring insert consisting essentially of a material selected from the class consisting of stellite and heavy metal carbide, and said second component being positioned only in said port end.
A valve guide insert for lining a valve guide of an internal combustion engine comprising a tubular, metallic sleeve having a spring end and a port end, said sleeve having an outer surface adapted to fit within the valve guide of the internal combustion engine and a length of an inner surface to receive a valve stem, said sleeve including a first component extending over a major portion of the length of the inner surface and a second component extending over a minor portion of the length of the inner surface, said first component comprising a material of high thermal conductivity compared to that of said second component;
- said second component comprising a material of greater wear resistance than the material of said first component, said material of said second component selected from the class consisting of heavy metal carbide and stellite, said second component being disposed only in an area of wear between the center of said sleeve and said port end, said sleeve having a substantially constant inner diameter extending substantially the entire length of said sleeve.
Dependencies are inferred from the claim text.