To reduce weight, to aim at miniaturization, and to effectively reduce the tensile stress to be applied to a thin part.
A lower link 13 is provided with a crank pin bearing body 21 having a nearly cylindrical crank pin bearing part 32, connector pin bearing parts 22 and 23 having connector pin bearing parts 41 and 42, to which connector pins are inserted. A thin part of a central connection part 30, which is projected outward in the radial direction from a central part in the axial direction of the crank pin bearing part 32, crossing between the connector pin bearing part 41 and the crank pin bearing part 32 is partially formed thin in the radial direction. Near this thin part, the predetermined clearance ΔCL is provided between a boss part 50 of the central connection part 30 and bolt abutting surfaces 103 and 104 of the connector pin bearing members 22 and 23, which are fastened together for fixation by a bolt 54 in a direction crossing the shaft.
MOGI KATSUYA
TANAKA YOSHIAKI
HIYOSHI RYOSUKE
Tsuyoshi Hashimoto
Hiromichi Kobayashi
Tomioka Kiyoshi