Importance

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Abstract

An engine includes a piston inside a cylinder, a crank shaft, a connecting rod, an oil dipper provided in a big end portion of the connecting rod, and a piston pin which connects pin boss regions of the piston to a small end portion of the connecting rod, and a crank case. The piston pin is rotatably movable with respect to the pin boss regions and the connecting rod. There are counter regions between the small end portion and the piston pin, a first counter region on a side closer to a tip portion of the connecting rod and a second counter region on a side closer to the big end portion of the connecting rod. The first counter region includes two ends located farther inward than two ends of the second counter region in an axial direction of the piston pin.

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First Claim