| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a smooth gear change free from a gear change shock or the like by attempting to reduce rotation resistance and securing a detection precision with a revolution number sensor. SOLUTION: This revolution number detection device 80 is provided with a gear mechanism and a plurality of friction engagement device. The revolution number detection device 80 is constituted so that the device selectively operates the friction engagement device to change over a power transmission channel to change the gear. In this case, the revolution number detection device 80 has a clutch drum 41 provided with a notch groove 41a on a periphery of an open end, a return plate 51 having a claw part 56b engaged with a notch groove 41 to be projected and a revolution number sensor 81 provided on a transmission case facing to the claw part 56b.</p> |
