| 摘要 |
PURPOSE:To avoid the need of the intermediate shaft for reversal of a transmission by installing a planetary gear mechanism for normal and reverse revolution onto the centrifugal clutch part of an internal-combustion engine. CONSTITUTION:A sun gear 9 is integrally formed onto the side part of a shoe drum 8 of a centrifugal clutch 2, and a plurality of planetary gears 10 supported onto a carrier 11 are meshed with the sun gear 9, and an internal gear 12 is meshed outside, and thus a planetary gear mechanism 3 is constituted. Further, said internal gear is connected to the main shaft 5 of a transmission through a collar 15. Onto the spline on the surface of a ring 16 rotatably fitted onto a crankshaft 1 through the collar 15, a dog 17 is engaged in slidable ways between the position F for the simultaneous engagement with the cut part 9a on the sun gear 9 and the cut part 11a of the carrier 11 and the position R for the simultaneous engagement of the cut part 11a of the carrier 11 and the cut part 19a of a plate 19 fixed onto a crankcase 18.
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