Ramsey Corporation

Trw Limited

Herbert F Prasse

Harold E McCormick

William F Ott

Donald J Mayhew

A rolled steel oil control piston ring for internal combustion engines is of generally U-shaped cross section with a pair of opposed rigid sidewalls projecting inwardly of the ring from a central peripheral wall thereof. A pair of flat-faced solid scraper rims formed by closed pleats rolled from the peripheral wall extend outwardly of the ring. The ring is made by rolling flat strip steel stock through a series of profiled rollers. Pleats are formed in the central portion by the profiled rollers and the pleats are closed on themselves to provide the solid scraper rims. The finished strip is then punched to provide the vent openings in the peripheral wall, and coiled and cut to form individual piston rings.

Rolled metal piston ring

A rolled steel oil control piston ring for internal combustion engines is of generally U-shaped cross section with a pair of opposed rigid sidewalls projecting inwardly of the ring from a central peripheral wall thereof. A pair of flat-faced solid scraper rims formed by closed pleats rolled from the peripheral wall extend outwardly of the ring. The ring is made by rolling flat strip steel stock through a series of profiled rollers by guiding the edges of the stock without deforming the same, while taking up dimensional variations of the stock by displacement of the central portion of the strip. Pleats are formed in the central portion by the profiled rollers and the pleats are closed on themselves to provide the solid scraper rims. An extrusion-like profile-reducing rolling step provides dimensional accuracy to the finished strip which is then punched to provide the vent openings in the peripheral wall, and coiled and cut to form individual piston rings.

Method of making a rolled metal piston ring

This invention relates to an alloy useful as a hard facing material. The alloy comprises a matrix such as a nickel-chromium matrix containing a separate interstitially boron-hardened tungsten phase. The alloy is used as a facing or coating for a number of base materials, and in particular as a piston ring facing. The invention is also concerned with a method of making said alloy by utilizing a plasma jet spray technique.

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Town & Country, MO, United States of America

Herbert F Prasse