FOUR-STROKE INTERNAL COMBUSTION ENGINE LUBRICATION DEVICE
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United States of America Patent
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Issued Date -
May 26, 2011
app pub date -
Nov 18, 2010
filing date -
Nov 26, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is provided a four-stroke internal combustion engine lubrication device that is capable of appropriately lubricating various parts regardless of engine orientation, of improving the capability for collecting excess oil within a valve chamber or the like and the capability for supplying oil to the various parts, and of reliably preventing oil leakage from a breather port provided in the valve chamber. It comprises: a reed valve (40) that allows oil flow from an oil chamber (17) into a crankcase (15) but prevents oil flow from the crankcase (15) to the oil chamber (17); an oil supply passage (35) for supplying oil from the crankcase (15) to a valve chamber (18); and a plurality of independent oil collection passages (51, 52) with differing inlet/outlet positions and for collecting in the oil chamber (17) the excess oil in the valve chamber (18). The dimensions of the various parts are so designed as to constantly maintain the oil chamber (17) under negative pressure during operation. The excess oil within the crankcase (15) is returned to the oil chamber (17) utilizing the negative pressure of the oil chamber (17).
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