| 摘要 |
PROBLEM TO BE SOLVED: To provide a balance device to be made mountable on mass-produced vehicles by equipping a plane crank, and miniaturizing and lightening a V-type engine having a bank nipping angle of 90 deg.. SOLUTION: First and second gears are interposed between first and second endless power transmission belts 15a and 15b, for driving the cam shafts of the cylinder heads of respective banks having V-character shape and a crank shaft 7; and a pair of balance shafts are provided so that the axial lines of the balance shafts can be parallel to the shaft 7 at symmetric positions, with the divided surface between upper and lower blocks 1 and 2 divided from a horizontal surface passed through by the center of the shaft 7 in a cylinder block as the center. The belts 15a and 15b and a third endless power transmission belt 19 are made unlapped in a crank axial direction by connecting the shaft 7 and a lower block side balance shaft 16 by a third endless power transmission belt, and connecting both the mating balance shafts by third gears 20a and 20b and inversely driving the balance shafts. The swollen out of an engine in the axis 7 direction can be suppressed by arranging the respective mating belts and the respective mating gears on the same plane orthogonal to the axis 7 direction.
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