Dual-clutch gearbox

A dual-clutch gearbox, comprising a box body in which a rotating shaft configured to receive torque from a drive motor is provided, wherein two gears are both in slip fit on the rotating shaft and coaxially sleeved on the rotating shaft;

• a motion bar is fitted to and coaxially provided on the rotating shaft, a linkage piece in coaxial engagement with the rotating shaft is fixed at one end of the motion bar, and a driver is in linkage with another end of the motion bar, so that the motion bar can move in its own axial direction under an action of the driver and allow the linkage of the linkage piece with one of the two gears;
• wherein the rotating shaft is provided with a through hole running through an axial surface on one side, and a guide groove communicated with the through hole and extending in an axial direction of the rotating shaft is provided on two opposite sides of an outer wall of the rotating shaft, respectively;
• the one end of the motion bar to which the linkage piece is fixed extends into the through hole, the linkage piece, with its ends coming out of the guide grooves, is in slip fit at the guide grooves, and each of the two gears comprises a fitting structure fitted to the ends of the linkage piece;
• wherein the fitting structure consists of a plurality of fitting grooves arranged radially on the gear around an axis of the gear;
• wherein an end face of an end of the linkage piece from its own axis to the gear side becomes closer to the outer wall of the rotating shaft;
• wherein an opening of each fitting groove is of an open structure, and the openings of two adjacent fitting grooves are connected by a cambered surface;
• wherein the gears are fixed to the rotating shaft through a first bearing, a step structure and a first stopper are provided on the rotating shaft, both the step structure and the first stopper are configured to confine an axial movement of the first bearing along the rotating shaft;
• wherein the other end of the motion bar away from the linkage piece is rotationally fixed to a movable plate, and the movable plate moves in the axial direction of the motion bar under an action of the driver;
• wherein a drive member capable of moving linearly is provided on an output end of the driver, is linearly parallel with the axial direction of the motion bar, and is connected to the motion bar through the movable plate;
• and
• wherein the movable plate is provided with a hold-down groove for fixing a second bearing, the motion bar is rotationally fixed to the movable plate through the second bearing, an axial end face of the motion bar is provided with a mounting hole, a bolt fixture is fixed with the mounting hole, the bolt fixture comprises an inner fixture segment extending into the mounting hole and an outer fixture segment always located outside the mounting hole;
• and the motion bar comprises a thick segment, and a thin segment fixed to an inner race of the second bearing, and the second bearing is confined between the thick segment of the motion bar and the outer fixture segment.