Two-stroke internal combustion engine and its scavenging method
US8746192B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 2011 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | May 8, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/025
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a two-stroke internal combustion engine using air for scavenging its combustion chamber (4), a scavenging passage (6) communicating with a crankcase (2) and a combustion chamber (4) is charged first with rich air-fuel mixture generated by a carburetor, next with lean air-fuel mixture, and next with air through an in-piston passage (36). The lean air-fuel mixture is generated in the in-piston passage 36 by diluting the air-fuel mixture with the air. In each scavenging stroke to scavenge the combustion chamber (4), the combustion chamber (4) is supplied first with the air (40) and next with the lean air-fuel mixture (42) from the scavenging passage (6). The use of the lean-air-fuel mixture (42) next to the air (40) contributes to reduce acceleration failure or engine stop caused by sudden acceleration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.