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Development of High-Performance 25 cm3 Two-Stroke SI Engine for Light Weight Arborist-Chainsaw
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 08, 2016 by SAE International in United States
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A new air-cooled SI two-stroke gasoline engine has been developed for an arborist-chainsaw. This engine has a displacement of 25 cm3 and generates about 1.1 kW and complies with the latest CARB and EPA exhaust regulations by optimizing scavenging flows and the use of a catalytic converter. Characteristics of lightweight, compact and high power-to-weight ratio are required for handheld chainsaws, especially for arborist chainsaws. As a matter of course, these characteristics are needed for engine itself in order to satisfy such market requirements for hand-held power equipment. To realize lightweight and compact design, the placement of catalytic converter is optimized for the engine and a two-piece crankshaft is adopted. Moreover, as preliminary studies, computer analyses such as CFD simulations of in-cylinder flow and cooling air flow, boundary pressure of piston surface during piston movement were performed to estimate output power, short circuit losses of fuel-air mixture, engine cooling performance and anti-seizure performance. Then, these performances were evaluated and modified by experimental studies. This paper presents overview of the arborist chainsaw, results of the simulation analyses and experimental evaluations.
CitationEto, K., Nozawa, M., Nara, M., Kobayashi, B. et al., "Development of High-Performance 25 cm3 Two-Stroke SI Engine for Light Weight Arborist-Chainsaw," SAE Technical Paper 2016-32-0049, 2016, https://doi.org/10.4271/2016-32-0049.
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