Lubrication structure for internal combustion engine
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United States of America Patent
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Aug 13, 2019
Grant Date -
Aug 23, 2018
app pub date -
Dec 29, 2017
filing date -
Feb 17, 2017
priority date (Note) -
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Abstract
A lubrication structure for an internal combustion engine includes an oil pump, a main gallery, an oil-supply passage, a sub gallery, and an oil-communication passage. The oil pump is installed in a crankcase configured by connecting an upper crankcase on a mating surface of a lower crankcase from above. The main gallery is provided in the lower crankcase for supplying oil from the oil pump to the engine. The oil-supply passage is provided in the lower crankcase and supplies oil from the main gallery to a mating-surface-oil passage of the mating surface. The sub gallery is provided in the upper crankcase for guiding oil to a piston jet that injects oil toward a piston of the engine. The oil-communication passage is provided across the lower and upper crankcases, branches from the oil-supply passage to communicate with the sub gallery, and guides oil in the oil-supply passage to the sub gallery.
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