Ae Plc

David Robert Adams

David Raymond Eastham

Alan D Pope

Jonathan D Philby

Johnathan D Philby

David F Spence

A method of reducing wear between the radial faces of a piston ring and the radial faces of the co-operating piston ring groove in an aluminium alloy piston is described. The method comprises the steps of locally alloying the region in which the piston ring groove radial faces are located to increase the concentration of at least one strengthening element and coating at least the co-operating radial faces of a piston ring with a compatible material. Nickel has been found to be particularly advantageous and an example is described of a piston which is locally alloyed by electron-beam melting wherein the nickel content is raised to about 12%. The co-operating piston ring was electroless plated with a nickel-phosphorus alloy.

Piston and piston ring

A method for the etching of chromium-coated piston rings comprises the steps of producing relative movement and rubbing contact between the chromium-coated surface of a piston ring which is anodic and a cathode having a porous material on the rubbing surface thereof, supplying an electrolyte to the porous material between the anodic ring surface and the cathode, establishing an electrical potential therebetween and supplying an electrical current for a period of time during the relative movement.

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Rugby, United Kingdom

David Robert Adams