Piston compression rings of copper-nickel-tin alloys
US10837554B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2017 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Mar 8, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05C2201/0475
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.