Dual clutch transmission for a motor vehicle

Patent metadata

Field	Value
Publication number	US-10746259-B2
Application number	US-201615551982-A
Country	US
Kind code	B2
Filing date	Jan 20, 2016
Priority date	Feb 19, 2015
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A dual clutch transmission for a motor vehicle provided with gearwheels sets that are shiftable via switching elements, which form in particular exactly eight wheel planes, which are respectively assigned to a first sub-transmission and to a second sub-transmission, among which each sub-transmission is provided with an input shaft and both sub-transmissions are provided with a common output shaft. The input shafts, which are coaxial to each other, can be alternately activated via a load-shiftable clutch, and the odd forward gears are assigned to the first sub-transmission and the even forward gears are assigned to the second sub-transmission, which can be shifted during a gear shift by means of the switching elements.

First claim

The invention claimed is:

1. A dual clutch for a motor vehicle, comprising:
gearwheel sets shiftable via shifting elements, which form exactly eight wheel planes arranged one after another in the sequence of the first through the eighth wheel plane of the dual clutch transmission in the axial direction from an input side to an output side, which are respectively assigned to a first sub-transmission and to a second sub-transmission, among which the first sub-transmission is provided with a first input shaft and the second sub-transmission is provided with a second input shaft, wherein the input shafts, which are coaxial to each other, can be alternately activated via a load-switchable clutch, and wherein at least some of the even forward gears are assigned to the first sub-transmission and at least some of the odd forward gears are assigned to the second sub-transmission, which can be shifted during a gear shift by a switching element, wherein the first sub-transmission is provided with at least the first, second and third wheel plane, among which each wheel planes are constructed with a drive-side gearwheel which is coaxial to the first input shaft and a gearwheel which is coaxial to an output shaft, wherein the output shaft is provided with a first switching element switchable on both sides in the axial direction, by which the first, second and third wheel plane of the first sub-transmission can be coupled to or decoupled from the output shaft, and wherein the output-side gearwheels of the first through third planes are mounted on the output shaft, and wherein in the axial direction on one side of the first switching element is arranged an output-side loose gearwheel of the third plane, and an output-side loose gearwheel of the second plane is mounted on an opposite side of the first switching element on the output shaft and wherein an output-side hollow shaft of the first sub-transmission is coaxially mounted on the output shaft, which can be alternately coupled via the first switching element to the output shaft, and wherein the output-side hollow shaft of the first sub-transmission non-rotatably supports the output-side gearwheels of the first and second wheel plane, wherein the first sub-transmission is provided with a fourth wheel plane whose output-side gearwheel is non-rotatably arranged on the output shaft, and the first input shaft of the first sub-transmission is provided with a second switching element operating on both sides in the axial direction, the second switching element being the only switching element on the first input shaft of the first sub-transmission, and that by the second switching element, the first input shaft can be coupled to or decoupled from all the wheel planes of the first sub-transmission.

2. The dual transmission clutch according to claim 1 , wherein a drive-side loose gearwheel of the first wheel plane is mounted in the axial direction on one side of the second switching element on the first input shaft, and a coaxially mounted drive-side hollow shaft of the first sub-transmission is arranged on the opposite side of the second switching element on the first input shaft and that the loose gearwheel of the first wheel plane, and the drive-side hollow shaft of the first sub-transmission can be alternately coupled via the second switching element to the first input shaft, and the drive-side hollow shaft of the first sub-transmission supports fixed gearwheels of the second and third wheel planes.

3. The dual transmission clutch according to claim 2 , wherein on the drive-side hollow shaft of the first sub-transmission is mounted a loosely mounted drive-side gearwheel of the fourth wheel plane, and the drive-side hollow shaft of the first sub-transmission is provided with a third switching element, by which the loosely mounted drive-side gearwheel of the fourth wheel plane can be coupled to the drive-side hollow shaft of the first sub-transmission.

4. The dual transmission clutch according to claim 3 , wherein the second sub-transmission is provided with a fifth wheel plane immediately adjacent to the first sub-transmission in the axial direction, and the fifth wheel plane can be coupled by the third switching element to the first sub-transmission.

5. The dual transmission clutch according to claim 4 , wherein the fifth wheel plane, which is switchable to both sub-transmissions is mounted with its drive-side gearwheel on the second input shaft and by the third switching element, the drive-side hollow shaft can be coupled to the first sub-transmission.

6. The dual transmission clutch according to claim 4 , wherein the second input shaft of the second sub-transmission is provided with a fourth switching element, which is switchable on both sides in the axial direction, the fourth switching element being the only switching element on the second input shaft of the second sub-transmission, and that by the fourth switching element, the second input shaft can be coupled to or decoupled from the wheel planes of the second sub-transmission.

7. The dual transmission clutch according to claim 6 , wherein a drive-side loose gearwheel of an eighth wheel plane, is arranged respectively on the second input shaft of the second sub-transmission on one side of the fourth switching element in the axial direction, and a drive-side hollow shaft is arranged coaxially on the second input shaft on the opposite side of the fourth switching element in the axial direction, which can be alternately coupled via the fourth switching element to the second input shaft, and the drive-side hollow shaft of the second sub-transmission supports at least one fixed wheel of a seventh wheel plane.

8. The dual transmission clutch according to claim 7 , wherein on the drive-side hollow shaft of the second sub-transmission is mounted a drive-side gearwheel of a sixth wheel plane, and the drive-side hollow shaft of the second sub-transmission can be coupled by a fifth switching element to the mounted drive-side gearwheel of the sixth wheel plane.

9. The dual transmission clutch according to claim 8 , wherein the drive-side gearwheel of the fifth wheel plane, which can be shifted to both sub-transmissions, can be coupled by the fifth switching element to the drive-side hollow shaft of the second sub-transmission.

10. The dual transmission clutch according to claim 4 , wherein the output-side gearwheel of the fifth wheel plane switchable to both sub-transmissions is non-rotationally arranged as a fixed gearwheel on the output shaft, or the output-side gearwheel of the fifth wheel plane is mounted on the output shaft and can be coupled via a seventh switching element to the output shaft.

11. The dual transmission clutch according to claim 1 , wherein the drive-side gearwheels of the seventh and eighth wheel plane of the second sub-transmission are non-rotationally arranged on an output-side hollow shaft of the second sub-transmission, which is coaxially and rotationally mounted on the output shaft.

12. The dual transmission clutch according to claim 11 , wherein the output shaft is provided with a sixth switching element, by which the output hollow shaft of the second sub-transmission can be coupled to the output shaft.

Assignees

• Audi Ag

Inventors

• Hummel Steffen

Classifications

• F16H2200/0078

  the gear ratio comprising twelve or more forward speeds · 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

• F16H2003/0818

  comprising means for power-shifting · CPC title

• F16H3/006 Primary

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

• F16H2003/0822

  characterised by the arrangement of at least one reverse gear · CPC title