| 摘要 |
A rotation detecting device for detecting the rotational speed of a gear in a transmission without increasing the width of the gear in the axial direction, using any expensive sensor and not limiting the location of a shift drum. An internal combustion engine includes a crankcase in which a crankshaft and a transmission are accommodated. The transmission includes a plurality of gears for shifting, an input shaft for inputting a rotational drive force from the crankshaft, and an output shaft wherein the rotational drive force is transmitted from the input shaft through the gears and to the output shaft to a drive wheel. The internal combustion engine includes rotation detecting devices for respectively detecting the rotational speeds of the gears. The rotation detecting devices respectively include detecting portions opposed to the gears rotating with the rotation of the input shaft and positioned in the axial direction of the transmission.
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