(57) A lubrication apparatus for an engine includes a crankshaft chamber (11), a camshaft
chamber (12), and an oil reservoir chamber (13), wherein an oil-suction piping path
is provided in the oil reservoir chamber (13), and is communicated between the crankshaft
chamber (11) and the oil reservoir chamber (13). The oil-suction piping path includes,
among others, a rotatable pipe (15) including a plurality of oil-suction orifices
(152) located at wall of the rotatable pipe (15). No matter the engine is situated
at any state of declination, at least one of the oil-suction orifices (152) and an
air-suction vent (151) is kept under the surface of the lubricant, so that the engine
can be appropriately lubricated. Further, a one-way valve (19) is arranged between
the crankshaft chamber (11) and the oil reservoir chamber (13), where most of the
lubricant can flow back to the oil reservoir chamber (13) during the descending stroke
of a piston, so that a lubricant supply can be reduced.
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