| 摘要 |
PROBLEM TO BE SOLVED: To increase contact pressure of a first parting face 24A on which load in opening direction acts. SOLUTION: A lower link 4 is provided with a roughly center crank pin bearing part 21 in which a crank pin fits, a pin boss part 22 for an upper pin of one end part, and a pin boss part 22 for a control pin of another end part, and is constructed with divided to a lower link upper 31 and a lower link lower 32 along parting faces 24A, 24B passing through a center of the crank pin bearing part 21 for securing assemblavility to the crank pin. Both parts are fastened as one unit by two bolts. A hollow part 40 is hollowly provided on a side surface of the lower link 4 and the hollow part 40 is extended from the lower link upper 31 over the lower link lower 32 so as to cross only the first parting face 24A at the control pin boss part 23 side on which load in a direction opening the parting faces acts in the first parting face 24A and the second parting face 24B positioned at both sides of the crank pin bearing part 21. COPYRIGHT: (C)2009,JPO&INPIT
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