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.


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    Titel :

    Development of High-Performance 25 cm3 Two-Stroke SI Engine for Light Weight Arborist-Chainsaw


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Kobayashi, Buhei (Autor:in) / Shibasaki, Daiki (Autor:in) / Shirai, Ken (Autor:in) / Eto, Kuniyoshi (Autor:in) / Nozawa, Masaru (Autor:in) / Nara, Masato (Autor:in)

    Kongress:

    SAE/JSAE 2016 Small Engine Technology Conference & Exhibition ; 2016



    Erscheinungsdatum :

    08.11.2016




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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