Sliding structure for internal combustion engine, method for controlling idling operation, and method for controlling operation of internal combustion engine
US11111875B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2017 |
| Grant date | Sep 7, 2021 |
| Priority date | — |
| Expiry date | Dec 25, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a sliding structure for an internal combustion, a cylinder has recesses in a stroke center region. Piston rings have inclined surfaces on an outer circumferential surface, and a lubricating oil flows between the inner wall surface and the outer circumferential surface that relatively move via the inclined surfaces. At any RPM equal to or greater than at idle, a center friction coefficient at the stroke center region through which the piston rings pass at the highest speed is less than a center friction coefficient when no recesses are formed in the stroke center region. Contrarily, at the RPM, an outside friction coefficient when the piston rings pass through a region outside the stroke center region is less than an outside friction coefficient when the recesses are formed in the outside region. As a result, further improved low fuel efficiency is achieved for the dimple liner technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.