SHRNUTÍTento článek popisuje část návrhového procesu klikové hřídele vznětového dvoudobého motoru s protiběžnými písty, při níž je pro zadané průměry a délky čepů hledán optimální tvar ramen hřídele. Je zde popsán postup vzniku několika variant, které jsou následně podrobeny kritickému zhodnocení, a dále mechanismus výběru výsledného nejlepšího možného návrhu. Výsledný tvar klikové hřídele je v poslední fázi podroben výpočtu únavové životnosti, jakožto finálního kroku návrhového procesu.
KLÍČOVÁ SLOVA: KLIKOVÁ HŘÍDEL, TOPOLOGICKÁ OPTIMALIZACE, ÚNAVOVÁ ŽIVOTNOST ABSTRACTThis article presents part of the crankshaft development of a two-stroke compression-ignition engine with contra-running pistons where, for invariably specified diameters and pin lengths, the optimal crankshaft shape is searched for. The process of creating several options which are then subjected to critical evaluation followed by the selection mechanism for the final best possible design is described. As the final step of the design process the resulting crankshaft shape is examined by calculation of fatigue life.
This paper presents the motivation for a range extender engine development because in comparison to power train of an electric vehicle equipped only by high-voltage battery, cost and mass saves should be reached depending on required vehicle range. The engine concept is supposed to be based on the cylinder unit of the standard ŠKODA AUTO three-cylinder engine. In order to meet power requirements and demands on costs and simplicity, the in-line two-cylinder layout is chosen for range extender. Six variants of the crank train layout are designed and compared considering mainly their balancing and vibration.
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