发明授权
US06325037B1 Crankcase arrangement for engine 有权
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Crankcase arrangement for engine
摘要:
A crankcase arrangement for an engine includes an improved construction that allows lubricant to more freely flow through the crankcase and to quickly return to a lubricant reservoir even though the engine has a compact construction. A cylinder body of an exemplifying engine includes at least an upper bearing portion, intermediate bearing portion and lower bearing portion. A crankcase member, which defines a crankcase cavity with the cylinder body, includes an upper bearing section and a lower bearing section. An upper main bearing journal of a crankshaft is rotatably journaled between the upper bearing portion and the upper bearing section and a lower main bearing journal of the crankshaft is rotatably journaled between the lower bearing portion and the lower bearing section. A bearing cap is arranged to rotatably journal the crankshaft with the intermediate bearing portion. In a preferred form, the bearing cap includes a plurality of cap sections that are joined together. Each cap section cooperates with a corresponding intermediate bearing portion of the cylinder body. Intermediate main bearings, which are formed by the cooperating cap sections and intermediate bearing portions, journal the crankshaft at a plurality of locations between the upper and lower main bearing journals of the crankshaft.
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