Shift device of dual clutch transmission

A shift device of a dual clutch transmission, comprising:

• a select motor;
• a select guide block moving in a straight direction by a driving of the select motor;
• a pair of odd-stage and even-stage control shafts arranged parallel to one another and at opposite sides of the select guide block, each shaft moving in an axial select direction by the straight movement of the select guide block;
• a pair of odd-stage and even-stage shift motors each providing a shaft rotating force to the pair of control shafts in a shift direction;
• and
• a lead screw rotating by the select motor to provide a straight moving force to the select guide block, said select guide block having internal threads mating with external threads of the lead screw;
• wherein the lead screw is configured to interlock with the select motor through a reducer,
• wherein the select guide block is provided with a pair of guide grooves for providing a shaft moving force to the pair of control shafts, respectively, in the select direction and the guide grooves are formed on opposing side surfaces of the select guide block, the grooves facing and engaged with the control shafts and
• wherein each guide groove continuously forms a flat surface and an inclined surface having a multi-stage structure to adjust a shaft moving displacement of the pair of control shafts in the select direction as determined by a straight moving distance of the select guide block.