Two-stroke internal combustion engine
US7255072B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 2006 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | May 23, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2720/236
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a two-stroke internal combustion engine (1) using an internal cooling piston (2), the piston (2) has in-piston scavenging passages (19) defined therein by partition walls (18), and lower-end inlets (20) of the in-piston scavenging passages (19) are opened downward and narrowed in opening area by piston pin bosses (16). In-cylinder scavenging passages (14), which are opened and closed as the piston (2) moves, are supplied with an air-fuel mixture from the narrowed lower-end inlets (20) through the in-piston scavenging passages (19). Thereby, a fresh air-fuel mixture is increased in flow rate when flowing from the in-cylinder scavenging passages (14) to the combustion chamber (10), and the scavenging efficiency of the engine is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.