Nissan Motor Company Limited

Kazuto Waki

Yoshihiro Kobayashi

Shigeru Nakajima

Daisuke Watanabe

Kazuhiko Takashima

Mitsuo Touse

Takeshi Chihara

Kousuke Inoue

A jig () is placed on a cylinder block () set in an inverted position, and a crankshaft () is lifted upward from a main bearing part () and held at a predetermined height position. A lower link () temporarily fitted to a crank pin () in the previous step is rotated about the crank pin () as a center by a robot hand, and held in a predetermined inclined position in which a dividing surface () becomes vertical. In this state, a pair of bolts () is horizontally fastened from the right and the left by using a nut runner ().

Bolt fastening method for lower link

A lubrication structure of the present invention is applied to a multi-link piston crank mechanism that has a upper link (), a lower link () and a control link (). Lubricating oil is supplied in an oil storing portion () formed between a pair of upper-pin pin boss portions () by a plate member () through an oil supply hole (). By oscillating rotary motion of the upper link side pin boss portion () that is provided with an oil groove () on an end surface of the upper link side pin boss portion (), the lubricating oil in the oil storing portion () is supplied to an upper pin ().

Lubrication structure and lubrication method for upper pin in piston crank mechanism of internal combustion engine

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Kanagawa, Japan

Kazuto Waki