MULTI-LINK PISTON CRANK MECHANISM FOR INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Jul 22, 2021
app pub date -
Jun 7, 2018
filing date -
Jun 7, 2018
priority date (Note) -
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Abstract
A lower link (7) is formed of two components by being divided at a dividing surface (14) including the central axis of a crank pin bearing portion (11), the two components including a lower link upper (15) with an upper pin bearing portion (12) and a lower link lower (16) with a control pin bearing portion (13). The dividing surface (14) includes a first dividing surface (14a) located more on the upper link side than the crank pin bearing portion (11) and a second dividing surface (14b) located more on the control link side than the crank pin bearing portion (11). In the lower link (7), the first dividing surface (14a) has a surface roughness larger than a surface roughness of the second dividing surface (14b).
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