Double-link piston crank mechanism for internal combustion engine
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United States of America Patent
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Jan 2, 2018
Grant Date -
Jul 14, 2016
app pub date -
Jul 30, 2014
filing date -
Aug 22, 2013
priority date (Note) -
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Abstract
An opening on one end side of a pin-boss oil passage opens to the inner circumferential surface of a pin boss part of an upper link, while an opening on the other end side thereof opens to the outer circumferential surface of the pin boss part of the upper link. A lower-link oil passage has a one-end-side opening structured to open to a pin-boss-facing surface of the lower link facing the outer circumferential surface of the pin boss part of the upper link and its other-end-side opening structured to open to a crankpin bearing surface. The lower-link oil passage is configured to point, at a prescribed crankangle, to a specified end edge of end edges of the other-end-side opening of the pin-boss oil passage, the specified end edge facing one end side of the upper link.
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