| 摘要 |
A double-link piston crank mechanism wherein an input load F1 caused by a combustion load acts on one end of a lower link (7) having, on either side of a crank pin bearing part (12), a bifurcated one-end protruding piece (13) sandwiching the other end of an upper link (8) and a bifurcated other-end protruding piece (14) sandwiching the other end of a control link (9). The thickness of the central portion (12a) of the crank pin bearing part (12) in the crankshaft axial direction is greater for the portion located on the one end of the lower link (7) than for the portion located on the other end. The thickness of a control link other-end part (32) is greater than the thickness of an upper link other-end part (24). |
