DOUBLE CLUTCH TRANSMISSION FOR A MOTOR VEHICLE

Abstract

The transmission comprises a gearbox having first and second input shafts coaxial to one another, wherein the second input shaft carries driving gearwheels associated to the even gears (second, fourth and sixth) and to the highest gear (sixth or seventh); and a clutch unit having first and second dry friction clutches arranged to couple a drive shaft of the motor vehicle respectively to the first and second input shafts of the gearbox. The first friction clutch associated to the first input shaft is normally disengaged, whereas the second friction clutch associated to the second input shaft is normally engaged.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics and the advantages of the invention will become apparent from the detailed description which follows, given purely by way of non-limiting example with reference to FIG. 1 of the appended drawings, which shows a longitudinal section of a double clutch transmission for a motor vehicle, in particular of a clutch unit of the transmission, according to a preferred embodiment of the invention.

Claims

1. A double clutch transmission with six or seven forward gears for a motor vehicle, comprising a gearbox having first and second input shafts coaxial to one another, anda clutch unit having a first normally-disengaged friction clutch arranged to couple a drive shaft of the motor vehicle to the first input shaft and a second normally-engaged friction clutch arranged to couple the drive shaft of the motor vehicle to the second input shaft,

2. The transmission of claim 1, wherein the first and second friction clutches are dry friction clutches.

3. The transmission of claim 1, wherein the first input shaft is arranged within the second input shaft.

4. The transmission of claim 1, wherein the second input shaft is arranged within the first input shaft.