Patent · US Active

Two-stroke engine

US8667933B2 · kind B2 · utility

3Cited by

1References

13Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Michael Grether · Waiblingen, DE
Robert Köhli · Winnenden, DE
Stefan Kummermehr · Winnenden, DE

Key dates

Filing date	Dec 15, 2011
Grant date	Mar 11, 2014
Priority date	—
Expiry date	Aug 29, 2032

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B25/00
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.