SPEED CHANGE APPARATUS FOR VEHICLE

摘要

In a speed change apparatus for a vehicle, a controller stores as a clutch-disengaging shift spindle angle θ1 a position at which a clutch is disengaged when a shift spindle is rotated in a first direction. The controller controls the shift spindle by a first step W1 of rotating the shift spindle in the first direction until a disengaging-side target angle Ta1 is reached; a second step W2 of returning the shift spindle in a second direction opposite to the first direction; and a third step W3 of rotating the shift spindle in the first direction up to the clutch-disengaging shift spindle angle θ1 and thereafter rotating the shift spindle in the second direction to return the shift spindle, upon detection of an output from a drum angle sensor, the output corresponding to shallow engagement of dog teeth.

主权项

1. A speed change apparatus for a vehicle, comprising:
a transmission including: a main shaft to which rotational power of a crankshaft of an engine is transmitted through a clutch; a counter shaft disposed in parallel to the main shaft;a driving-side shifter gear rotated as one body with the main shaft and movable in an axial direction;
a driving-side free gear rotatable relative to the main shaft and fixed in the axial direction; a dog clutch engageable and disengageable through dog teeth erected in the axial direction from opposed surfaces of the driving-side shifter gear and the driving-side free gear; a driven-side shifter gear rotated as one body with the counter shaft and movable in the axial direction; a driven-side free gear rotatable relative to the counter shaft and fixed in the axial direction; and a dog clutch engageable and disengageable through dog teeth erected in the axial direction from opposed surfaces of the driven-side shifter gear and the driven-side free gear; a change mechanism including: a plurality of shift forks adapted to move the driving-side shifter gear and the driven-side shifter gear in the axial direction; and a shift drum formed in an outer circumferential surface thereof with a plurality of grooves for engagement with end portions of the shift forks; a shift spindle which is provided with a clutch lever adapted to operate engagement/disengagement of the clutch and is provided, in a relatively rotatable manner, with a master arm adapted to operate the change mechanism; an actuator adapted to drive the shift spindle;a shift spindle angle sensor adapted to detect a rotational angle of the shift spindle;
a controller adapted to control the actuator; and a drum angle sensor adapted to detect a rotational angle of the shift drum;wherein the shift spindle is configured so that, when rotated in a first direction, the shift spindle first operates the clutch lever to disengage the clutch and thereafter rotates the master arm to operate the change mechanism;
the controller stores as a clutch-disengaging shift spindle angle (θ1) a position at which the clutch is disengaged when the shift spindle is rotated in the first direction; and the controller controls the shift spindle by: a first step (W1) of rotating the shift spindle in the first direction until the shift spindle reaches a first target rotational angle (Ta1); a second step (W2) of returning the shift spindle in a second direction opposite to the first direction; and a third step (W3) of rotating the shift spindle in the first direction up to the clutch-disengaging shift spindle angle (θ1) and thereafter rotating the shift spindle in the second direction to return the shift spindle, upon detection of an output from the drum angle sensor, the output corresponding to shallow engagement of the dog teeth.