Two-stroke engine and method for operating the same

• Main Authors: LUITHARDT WOLFGANG, OSBURG GERHARD, JUG SIMON
• Format: Patent
• Language: English
• Published: 28.03.2006
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

A two-stroke engine ( 1 ) is especially for a handheld work apparatus such as a motor-driven chain saw, a cutoff machine or the like and has a cylinder ( 2 ) wherein a combustion chamber ( 3 ) is formed. The combustion chamber ( 3 ) is delimited by a reciprocating piston ( 5 ). The piston ( 5 ) drives a crankshaft ( 7 ) via a connecting rod ( 6 ). The crankshaft ( 7 ) is rotatably journalled in the crankcase ( 4 ). The combustion chamber ( 3 ) is connected to the crankcase ( 4 ) at pregiven piston positions via at least one transfer channel ( 11 ). The combustion chamber ( 3 ) has an outlet ( 10 ) for exhaust gases. An air channel ( 9 ) is provided which conducts combustion air into the crankcase ( 4 ) and a throttle element is mounted in the air channel ( 9 ). A compact configuration of the two-stroke engine ( 1 ) can be achieved when a separate fuel inlet ( 13 ) is provided in the crankcase ( 4 ) which is fed by a fuel metering system ( 15 ). The fuel metering system ( 15 ) has means for supplying fuel in dependence upon the position of the throttle element and/or in dependence upon the engine rpm. A method for operating the two-stroke engine ( 1 ) provides that the fuel is prepared to an air/fuel mixture in the crankcase ( 4 ) with the combustion air supplied via the air inlet ( 14 ).