SHIFT DRUM ANGLE DETECTING DEVICE FOR TRANSMISSION

摘要

A shift drum angle detecting device for a transmission includes shift forks, a shift drum, a first sensor shaft, a first angle sensor, a speed increasing mechanism, and a second angle sensor. The first angle sensor is to detect a rotational angle of the first sensor shaft to output a first output value based on the rotational angle. The speed increasing mechanism includes a speed increasing drive member, a speed increasing driven member, and a second sensor shaft. The second angle sensor is provided to the second sensor shaft to detect a rotational angle of the second sensor shaft and to output a second output value based on the rotational angle. A rotational angle of the shift drum is to be detected based on the first output value output from the first angle sensor and the second output value output from the second angle sensor.

主权项

1. A shift drum angle detecting device for a transmission, the shift drum angle detecting device being used for the transmission of a constant-mesh type, the transmission including a main shaft supporting a plurality of driving gears and a counter shaft supporting a plurality of driven gears meshing with a plurality of the driving gears, the shift drum angle detecting device comprising:
shift forks engaged with shifter gears of the driving gears and the driven gears; a shift drum having an outer circumferential surface in which lead grooves to which one ends of the shift forks are locked are formed; a first sensor shaft provided to the shift drum and rotated integrally with the shift drum; a first angle sensor detecting a rotational angle of the first sensor shaft; a speed increasing mechanism increasing an amount of rotation of the first sensor shaft at a predetermined speed increasing ratio, the speed increasing mechanism including
a speed increasing drive member rotated integrally with the first sensor shaft,a speed increasing driven member driven by the speed increasing drive member and having a diameter smaller than the speed increasing drive member, anda second sensor shaft rotated integrally with the speed increasing driven member; and a second angle sensor detecting a rotational angle of the second sensor shaft, the second angle sensor being provided to the second sensor shaft; a rotational angle of the shift drum being detected by using an output value based on the rotational angle detected by the first angle sensor and an output value based on the rotational angle detected by the second angle sensor.