Dual clutch transmission

Abstract

A dual clutch transmission which can reduce the overall length of a transmission and improve mountability in the vehicle by simplifying the constituent elements of the transmission, is configured by reducing the number of synchronizers and external gears and shafts, and a drive motor is not disposed on the same axle as other constituent elements to reduce the overall length of the transmission, reducing cost and weight of the transmission to improve mountability of the transmission in the vehicle.

1 - 14 . (canceled) 
     
     
         15 . A dual clutch transmission comprising:
 a first clutch, a second clutch and a third clutch;   a first input shaft to which the first clutch is mounted and a second input shaft to which the second clutch is mounted, wherein a rotational power of an engine connected to the first clutch and the second clutch is selectively inputted to the first input shaft and the second input shaft by operation of the first clutch and the second clutch;   a countershaft disposed in parallel with the first and second input shafts;   an output shaft selectively connectable to the countershaft through the third clutch;   a planetary gear set provided with three rotation elements having first, second, and third rotation elements, wherein the first rotation element is connected to the first input shaft so that the rotational power of the engine is selectively inputted thereto, the second rotation element is connected to the second input shaft so that a rotational power is selectively inputted thereto and the third rotation element is coupled to the output shaft; and   an external gear set in which external gears provided in the first input shaft and the countershaft are engaged to each other.   
     
     
         16 . The dual clutch transmission of  claim 15 , further including a brake connected between the countershaft and a transmission housing to selectively connect the countershaft to the transmission housing. 
     
     
         17 . The dual clutch transmission of  claim 15 ,
 wherein the external gear set includes an input gear and a counter gear, and   wherein the input gear fixedly connected to the first input shaft and the counter gear fixedly connected to the countershaft are engaged to each other and the countershaft and the output shaft are disposed on a same axle, so that the countershaft and the output shaft are selectively connectable to each other through the third clutch mounted therebetween.