| 摘要 |
A support structure of a crank shaft of an engine comprises a crank shaft 24 provided such that it penetrates through a crank case, including a crank pin portion situated in the crank case, to which a large end portion of a connecting rod is connected, and having one end portion to which a belt converter is connected; a first bearing for holding a portion of the crank shaft that penetrates through the crank case, which is close to the one end portion of the crank shaft, rotatably with respect to the crank case, the first bearing being constituted by a double row ball bearing; a second bearing for holding a portion of the crank shaft that penetrates through the crank case, which is close to the other end portion of the crank shaft, rotatably with respect to the crank case; and means for forcibly feeding lubricating oil from the other end portion's side of the crank shaft, through an oil passage formed inside of the crank shaft, and to a portion where a large end portion of a connecting rod and the crank pin portion are connected to each other.
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