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1. (WO2018128774) PISTON COMPRESSION RINGS OF COPPER ALLOYS

Pub. No.:    WO/2018/128774    International Application No.:    PCT/US2017/066662
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
F16J 9/26
Applicants: MATERION CORPORATION
Inventors: KRUS, David J.
MACK, Steffen
WHITAKER, Andrew J.
Title: PISTON COMPRESSION RINGS OF COPPER ALLOYS
Abstract:
A piston ring is made from a copper-nickel-silicon-chromium 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.