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Various designs of the two-stroke engine heads with the valve flushed system

Łoza Ł., Kaźmierczak A., Borkowska J., Skorupa P., Krakowian K., Cienciała M.

Journal of KONES

2015

Vol. 22, No. 4

187--190

The two-stroke engines have never acquired the popularity of the four-stroke engines due to their inherent performance limitations. The tasks of many engineering teams were to find the basic causes, which resulted in the inferior performance of these engines. Today’s task is to build a two-stroke engine whose performance could match that of a four-stroke engine in areas of common use. The most typical performance problems of a two-stroke engine are high petrol consumption caused by low efficiency, toxic by-products of combustion being emitted into the atmosphere (caused by oil present in the petrol), and uneven and loud engine noise. The greatest challenge is to achieve a good chamber purge during one stroke in which the fresh fuel mixture flows through the piston-controlled inlet port while at the same time the fumes are being exhausted through the outlet port. This in contrast with the four-stroke engines where the intake and exhaust are each done with two separate strokes. From the energy point of view, the two-stroke engine is not efficient because a certain amount of fresh fuel is being wasted in the exhaust fumes. We propose to replace the piston-controlled cam with the valve-flushed system, which will cause the combustion process to become more efficient. The purpose of this paper is to present various designs of the engine heads and analyse their performance. The goal of this proposal is to choose the best combination of these engine heads in order to achieve the optimum overall engine performance.

Możliwości zastosowania nierównobieżnej przekładni cięgnowej z pasem zębatym w budowie urządzeń dla przemysłu chemicznego

Krawiec P.

Inżynieria i Aparatura Chemiczna

2010

Nr 6

35-37

Rozwój urządzeń dla przemysłu chemicznego determinuje wykorzystanie konstrukcji mechatronicznych będących zespoleniem napędów mechanicznych zc sterowaniem elektronicznym lub elektrycznym. W artykule przedstawiono wybrane cechy funkcjonalne nierównobieżnych przekładni cięgnowych powstałych przez połączenie niekołowych elementów zębatych pasem zębatym. Podano ideę zastosowania przekładni nierównobieżnych w budowie urządzeń dla przemysłu chemicznego.

Development of chemical industry devices determines the utilization of me-chatronics constructions being a set of mechanical drives and electronic or electrical control instruments. Selected functional features of uneven-running string transmissions based on coupling between non-circular gears and cogbelt is presented. Application of uneven-running transmissions in construction of chemical industry devices is shown.