Stanadyne Corporation

Robert C Behnke

Todd R Downing

A tappet for an internal combustion engine includes a tappet body having a camface at one end thereof, which camface is positioned for contact with a rotating camshaft. The camface is formed essentially of zirconium oxide.

Tappet with ceramic camface

An internal combustion engine tappet comprising a sintered powdered metal wear resistant composition having a matrix formed from iron powder, carbon in the range of 0.50-1.0% by weight, and a ferroalloy powder with a mesh size of +50-325 acting as a nucleus for diffusion of the alloying metal into the surrounding iron particles. The alloying metal in the composition is in the range of 1-10% by weight and is selected from the group consisting of chromium, titanium, boron, vanadium, columbium, molybdenum, tantalum and tungsten. The iron, carbon and ferroalloy are briquetted at a pressure of 40-60 tons/sq.in. and sintered, in solid phase, at a temperature of 2000.degree.-2100.degree. F. in a reducing atmosphere. The resulting product is heterogeneous and has hard ferroalloy nuclei and interconnected porosity with a density at the tappet wear surface of approximately 6.8-7.0 gm/cc.

Internal combustion engine tappet comprising a sintered powdered metal

A vehicle engine component has a specific compositon of alloyed chilled iron in which molybdenum is the major alloying element, thus producing a chilled iron with a more thermally stable carbide combined with a matrix which is stronger and more fatigue-resistant.

Growing community of inventors

Wheaton, IL, United States of America

Robert C Behnke