| 摘要 |
PROBLEM TO BE SOLVED: To optimize the rigidity of a lower link so that each bearing is symmetrically deformed against a load applied thereto. SOLUTION: In this double-link piston crank mechanism, the lower link 5 comprises a crankpin bearing part 31 at the generally center part, a pin boss part 32 for an upper pin, and a pin boss part 33 for a control pin. A bush is stored in the pin boss part 32 for an upper pin. Where the wall thickness of the portion of the pin boss part 32 for an upper pin on the opposite side of the crankpin bearing part is L1, the wall thickness of the portion between the pin boss part 32 for an upper pin and the crankpin bearing part 31 is L2, the distance between the center of the pin boss part 32 for an upper pin and the center of the crankpin bearing part 31 is L3, and the distance between the center of the pin boss part 33 for a control pin and the center of the crankpin bearing part 31 is L4, L3+2L4:L4=L2:L1. COPYRIGHT: (C)2009,JPO&INPIT
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