Dual clutch transmission for a motor vehicle

Patent metadata

Field	Value
Publication number	US-10591024-B2
Application number	US-201615551756-A
Country	US
Kind code	B2
Filing date	Jan 20, 2016
Priority date	Feb 19, 2015
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A dual-clutch transmission for a motor vehicle, with gear wheel sets engageable via shift elements, with the gear wheel sets forming particularly precisely eight wheel planes, each of which is allocated to a first sub-transmission and a second sub-transmission, of which each sub-transmission has an input shaft and both sub-transmissions have a common output shaft. The input shafts, which are coaxial with respect to one another, can each be activated in an alternating manner via a power-shift clutch, and the even forward gears are allocated to the first sub-transmission and the odd forward gears are allocated to the second sub-transmission, which can be engaged upon a gear change by way of the shift elements.

First claim

The invention claimed is:

1. A dual-clutch transmission for a motor vehicle, comprising:
with gear wheel sets engageable via first to seventh shift elements, with the gear wheel sets forming precisely eight first to eighth wheel planes in series in the axial direction from the input side to the output side of the dual-clutch transmission, each wheel plane being allocated to a first sub-transmission and to a second sub-transmission, of which the first sub-transmission has an input shaft and the second sub-transmission has a second input shaft and both sub-transmissions have a common output shaft, wherein the input shafts, which are coaxial with respect to one another, can each be activated in an alternating manner via a power-shift clutch, and the even forward gears are allocated to the first sub-transmission and the odd forward gears are allocated to the second sub-transmission, which can be engaged upon a gear shift by way of the first to seventh shift elements, wherein each wheel plane provides a direct gear as a forward gear, with which, when the first or second sub-transmission is activated, precisely one wheel plane is engaged in the torque flow extending through the activated first or second sub-transmission, and wherein the wheel planes additionally provide at least one torsion gear as a forward gear, in which precisely three wheel planes, which are combined in series, are engaged in the torque flow by the first to seventh shift elements, wherein a total of four torsion forward gears, with a total of eight wheel planes, can be provided, and in that three wheel planes engaged for each torsion gear are allocated either completely to the first sub-transmission or completely to the second sub-transmission, so that, with each engaged torsion forward gear, only the sub-transmission having three wheel planes engaged for the respective torsion gear is integrated into the torque flow, and the other sub-transmission is completely de-coupled from the torque flow.

2. The dual-clutch transmission according to claim 1 , wherein precisely five shift elements, engageable on both sides in the axial direction, are provided for engaging the forward gears, and two shift elements are provided, which can be engaged on one side in the axial direction.

3. The dual-clutch transmission according to claim 2 , wherein, of the five shift elements, which can be engaged on both sides, precisely four shift elements are arranged coaxially with respect to the input axis of the first and second input shafts, and precisely one shift element, which can be engaged on both sides, is arranged on the output shaft.

4. The dual-clutch transmission according to claim 1 , wherein at least two of the shift elements can be actuated in order to engage all of the forward gears.

5. The dual-clutch transmission according to claim 1 , wherein the first and second input shafts of the eight wheel planes are free of torsion-resistant gear wheels arranged thereupon, and in that the first input shaft has precisely one first shift element, which can be engaged on both sides in the axial direction, and the second input shaft has precisely one second shift element, which can be engaged on both sides in the axial direction, and in that the first input shaft can be linked to the first to fourth wheel planes of the first sub-transmission, or can be de-coupled therefrom, by means of the first shift element, and in that the second input shaft can be linked to the fifth to eighth wheel planes of the second sub-transmission, or can be de-coupled therefrom, by means of the second shift element.

6. The dual-clutch transmission according to claim 5 , wherein a drive-side detached gear wheel of a first wheel plane, mounted on the first input shaft, and a drive-side hollow shaft of the first sub-transmission, coaxially mounted on the first input shaft is arranged on both sides of the first shift element in the axial direction, which can be coupled in an alternating manner to the first input shaft via the first shift element, and the drive-side hollow shaft of the first sub-transmission supports a fixed gear wheel of the second wheel plane and a fixed gear wheel of the third wheel plane.

7. The dual-clutch transmission according to claim 6 , wherein a drive-side gear wheel of the fourth wheel plane is detachably mounted on the drive-side hollow shaft of the first sub-transmission, and the drive-side hollow shaft of the first sub-transmission can be linked to the detachably mounted drive-side gear wheel of the fourth wheel plane by way of a third shift element.

8. The dual-clutch transmission according to claim 7 , wherein the fifth wheel plane, directly adjacent to the first sub-transmission in the axial direction, is allocated to the second sub-transmission, and in that the fifth wheel plane can be linked to the first sub-transmission by the third shift element.

9. The dual-clutch transmission according to claim 8 , wherein the fifth wheel plane, which can be engaged on both sub-transmissions, is detachably mounted with its drive-side gear wheel on the second input shaft, and the drive-side gear wheel of the fifth wheel plane can be linked to the drive-side hollow shaft of the first sub-transmission by means of the third shift element.

10. The dual-clutch transmission according to one of claim 5 , wherein a drive-side detached gear wheel of the eighth wheel plane which is mounted on the second input shaft, and a drive-side hollow shaft, which is coaxially mounted on the second input shaft is arranged on both sides of the second shift element of the second sub-transmission in the axial direction, and the detached gear wheel of the eighth wheel plane and the drive-side hollow shaft of the second sub-transmission can be linked, in an alternating manner, to the second input shaft via the second shift element, and the drive-side hollow shaft of the second sub-transmission supports at least one fixed gear wheel of the seventh wheel plane.

11. The dual-clutch transmission according to claim 10 , wherein a drive-side gear wheel of the sixth wheel plane is detachably mounted on the drive-side hollow shaft of the second sub-transmission, and the drive-side hollow shaft of the second sub-transmission has a fourth shift element, with which the detachably mounted drive-side gear wheel of the sixth wheel plane can be linked to the drive-side hollow shaft of the second sub-transmission.

12. The dual-clutch transmission according to claim 11 , wherein the drive-side gear wheel of the fifth wheel plane engageable on both sub-transmissions can be linked to the second sub-transmission by the fourth shift element.

13. The dual-clutch transmission according to claim 1 , wherein the output-side gear wheels of the first and second wheel planes of the first sub-transmission are arranged, in a torsionally resistant manner, on an output-side hollow shaft of the first sub-transmission, which is rotatably mounted coaxially on the output shaft.

14. The dual-clutch transmission according to claim 13 , wherein the output shaft has a fifth shift element, by means of which the output-side hollow shaft of the first sub-transmission or an output-side gear wheel of the third wheel plane can be linked in an alternating manner to the output shaft in the first sub-transmission.

15. The dual-clutch transmission according to claim 1 , wherein the output-side gear wheels of the seventh and eighth wheel planes of the second sub-transmission are arranged, in a torsionally resistant manner, on an output-side hollow shaft of the second sub-transmission, which is rotatably mounted coaxially on the output shaft.

16. The dual-clutch tr

Assignees

• Audi Ag

Inventors

• Hummel Steffen

Classifications

• F16H3/006 Primary

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• F16H3/089 Primary

  all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved · CPC title

• F16H2003/0826

  wherein at least one gear on the input shaft, or on a countershaft is used for two different forward gear ratios · CPC title

• F16H2200/0078

  the gear ratio comprising twelve or more forward speeds · CPC title

• F16H2003/0803

  with countershafts coaxial with input or output shaft · CPC title