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1. (WO2018128775) PISTON COMPRESSION RINGS OF COPPER-NICKEL-TIN ALLOYS

Pub. No.:    WO/2018/128775    International Application No.:    PCT/US2017/066673
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Sat Dec 16 00:59:59 CET 2017
IPC: C22C 9/06
F01C 19/00
F02F 5/00
F16J 9/00
Applicants: MATERION CORPORATION
Inventors: KRUS, David J.
MACK, Steffen
WHITAKER, Andrew J.
Title: PISTON COMPRESSION RINGS OF COPPER-NICKEL-TIN ALLOYS
Abstract:
A piston ring is made from a copper-containing alloy. This material permits the top compression ring of a piston to be moved closer to the piston crown, reducing crevice volume and reducing the tendency for pre-ignition. Ignition timing advance can be realized by installing the rings and letting the ECU advance the timing as the sensors allow, increasing efficiency. Also, shorter pistons and longer connecting rods are possible. The shorter pistons reduces the reciprocated mass in the engine and the longer connecting rods reduce the frictional loss caused by radial forces pushing the piston against the liner. Both reducing volume and tendency for pre-ignition increase engine efficiency.