Lubrication apparatus for four-stroke engine
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United States of America Patent
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Jun 10, 2014
Grant Date -
May 16, 2013
app pub date -
Nov 1, 2012
filing date -
Nov 14, 2011
priority date (Note) -
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Abstract
A lubrication apparatus for a four-stroke engine includes a piston, a cylinder, a crank chamber and a valve operating chamber. The lubrication apparatus configured to lubricate driving parts while circulating oil mist through an oil circulation pathway, using pressure fluctuation in the crank chamber, the pressure fluctuation being caused by reciprocating motion of the piston. The lubrication apparatus further includes a direct passageway configured to allow communication between the valve operating chamber and the crank chamber when a negative pressure is created in the crank chamber. The direct passageway includes a flexible tube part that is formed out of the cylinder.
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