Transmission system for vehicle

A transmission system for a vehicle, comprising:

• a transmission in which a plurality of driving transmission gears supported on a driving transmission shaft and a plurality of driven transmission gears supported on a driven transmission shaft are meshed on a gear position basis, and shifters supported on at least one transmission shaft out of the driving transmission shaft and the driven transmission shaft are movable in an axial direction of the transmission shaft for engagement with the transmission gears rotatably supported on the one transmission shaft to thereby enable transmission of power;
• a shift driving mechanism for moving the shifters to thereby shift a gear position of the transmission;
• and
• a plurality of transmission clutches for establishing and interrupting transmission of power from a drive source to the driving transmission shaft:
• wherein, for shifting the gear position, the shift driving mechanism and the plurality of transmission clutches are under control of a control unit operated by gear position shifting operation to disengage a shifter and a transmission gear of a current gear position from each other after engaging a shifter and a transmission gear of a next gear position with each other, with one of the transmission clutches for transmitting power to the transmission gear of the next gear position being in an engaged state, and
• wherein, at the time of shifting the gear position, while one of the plurality of transmission clutches that transmits power to the transmission gear of the current gear position is kept in an engaged state, another of the plurality of transmission clutches that transmits power to the transmission gear of the next gear position is concurrently engaged.