| 摘要 |
A change speed transmission device using gears employs a shift drum mounted parallel to the driving and driven shafts. The shift drum is turned one-quarter revolution at a time to cause a shifting mechanism to produce a low speed drive, and an intermediate speed drive, and a high speed drive between the shafts, and then back to neutral. A pivoted pawl engages an abutment on the shaft drum to limit turning movement of the drum. An element frictionally engages a member fixed to rotate with the driven shaft and serves to bias the pawl to engage the abutment so that the shift drum is prevented from turning directly from a high speed shift position to a low speed shift position. |
