Dual clutch transmission for a motor vehicle

Patent metadata

Field	Value
Publication number	US-10677323-B2
Application number	US-201615551952-A
Country	US
Kind code	B2
Filing date	Jan 20, 2016
Priority date	Feb 19, 2015
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A dual clutch transmission for a motor vehicle, with gear wheel sets, which can be engaged via shift elements and which form exactly eight wheel planes, which are associated, respectively, with a first sub-transmission and a second sub-transmission, of which each sub-transmission has a respective input shaft and the two sub-transmissions have a common output shaft, which is axis-parallel to the input shafts. The mutually coaxial input shafts can each be activated in alternation via a power-shift clutch, and the even forward gears are associated with the first sub-transmission and the odd forward gears are associated with the second sub-transmission, which can be engaged when a gear shift occurs via the shift elements.

First claim

The invention claimed is:

1. A dual clutch transmission for a motor vehicle, comprising:
gear wheel sets, which can be engaged via first to seventh shift elements and which form exactly eight wheel planes, arranged in succession in the sequence first to eighth in the axial direction from an input side to an output side of the dual clutch transmission, said wheel planes being associated, respectively, with a first sub-transmission and a second sub-transmission, the first sub-transmission of which has a first input shaft and the second sub-transmission has a second input shaft, the first input shaft and the second input shaft being mutually coaxial, and the two sub-transmissions have a common output shaft that is axis-parallel to the input shafts, wherein the mutually coaxial input shafts can each be activated in alternation via a power-shift clutch, and at least some of the even forward speeds are associated with the first sub-transmission and at least some of the odd forward gears are associated with the second sub-transmission, which can be engaged when a gear shift occurs via the shift elements, wherein each of the wheel planes has a drive gear wheel, which is mounted detachably or in a torsionally resistant manner on the particular input shaft, and an output-side gear wheel, which is mounted detachably or in a torsionally resistant manner on the output shaft and meshes with the former gear wheel, which can be coupled to the particular input shaft and to the output shaft, or decoupled therefrom, by the shift elements with the formation of forward gears, wherein the first wheel plane and the second wheel plane in the first sub-transmission are joined together in a torsionally resistant manner by way of an output-side hollow shaft of the first sub-transmission, which is mounted coaxially and rotatably on the output shaft, and wherein both an output-side gear wheel of the first wheel plane as well as an output-side gear wheel of the second wheel plane are arranged in a torsionally resistant manner on the output-side hollow shaft of the first sub-transmission, and wherein the second wheel plane and a third wheel plane that follows in the axial direction are joined together in a torsionally resistant manner by way of a drive-side hollow shaft of the first sub-transmission, which is mounted coaxially and rotatably on the first input shaft, wherein a drive-side gear wheel of the second wheel plane as well as a drive-side gear wheel of the third wheel plane are arranged in a torsionally resistant manner on the drive-side hollow shaft, wherein the first sub-transmission has a fourth wheel plane, which has an output-side gear wheel arranged in a torsionally resistant manner on the output shaft and a drive-side gear wheel mounted detachably and rotatably on the drive-side hollow shaft of the first sub-transmission and meshes with the former gear wheel, and the drive-side gear wheel of the fourth wheel plane can be coupled to the drive-side hollow shaft of the first sub-transmission by a-the third shift element.

2. The dual clutch transmission according to claim 1 , wherein the output-side hollow shaft of the first sub-transmission can be coupled to the output shaft by way of the first shift element, and the first shift element is borne by the output shaft and lies transverse to the axial direction, in the radial direction, opposite in alignment to the drive-side hollow shaft.

3. The dual clutch transmission according to claim 1 , wherein the drive-side hollow shaft of the first sub-transmission can be coupled to the first input shaft by way of the second shift element, and the second shift element is borne by the first input shaft and lies transverse to the axial direction, in the radial direction, opposite in alignment to the output-side hollow shaft.

4. The dual clutch transmission according to claim 1 , wherein the second shift element is a shift element that can be engaged on both sides in the axial direction, and the second shift element is arranged in the axial direction between the two drive-side gear wheels of the first and second wheel planes, and is borne by the first input shaft.

5. The dual clutch transmission according to claim 4 , wherein the third wheel plane of the first sub-transmission has an output-side gear wheel, which is detachably and rotatably mounted on the output shaft and meshes with the drive-side gear wheel, which is detachably and rotatably mounted on the first input shaft.

6. The dual clutch transmission according to claim 5 , wherein the output-side gear wheel of the third wheel plane can be coupled to the output shaft by the first shift element, and the first shift element is arranged as a shift element that can be engaged on both sides in axial direction between the two output-side gear wheels of the second and third wheel planes.

7. The dual clutch transmission according to claim 5 , wherein the drive-side gear wheel of the third wheel plane is arranged, together with the drive-side gear wheel of the second wheel plane, in a torsionally resistant manner, on the drive-side hollow shaft of the first sub-transmission, which is coaxially and rotatably mounted on the first input shaft.

8. The dual clutch transmission according to claim 1 , wherein the second sub-transmission has a fifth wheel plane, which has a drive-side gear wheel, which is detachably and rotatably mounted on the second input shaft, and an output-side gear wheel, which is detachably and rotatably mounted on the output shaft.

9. The dual clutch transmission according to claim 8 , wherein the drive-side gear wheel of the fifth wheel plane can be coupled to the drive-side hollow shaft of the first sub-transmission by the third shift element, and the third shift element is a shift element that can be engaged on both sides in the axial direction and is borne in the axial direction between the fourth wheel plane and the fifth wheel plane by the hollow shaft of the first sub-transmission.

10. The dual clutch transmission according to claim 8 , wherein the output-side gear wheel of the fifth wheel plane can be coupled to the output shaft via a fourth shift element.

11. The dual clutch transmission according to claim 1 , wherein the second sub-transmission has seventh and eighth wheel planes, and the two output-side gear wheels of the seventh and eighth wheel planes are arranged, in a torsionally resistant manner, on an output-side hollow shaft of the second sub-transmission, which is coaxially and rotatably mounted on the output shaft, and the second sub-transmission has a sixth wheel plane, which, together with the seventh wheel plane, which follows in the axial direction, can be coupled, in a torsionally resistant manner, via a drive-side hollow shaft of the second sub-transmission, which is coaxially and rotatably mounted on the second input shaft, and on which both a drive-side gear wheel of the seventh wheel plane is arranged in a torsionally resistant manner, and a drive-side gear wheel of the sixth wheel plane is detachably and rotatably mounted.

12. The dual clutch transmission according to claim 11 , wherein the two drive-side gear wheels of the seventh and eighth wheel planes can be coupled in alternation to the input shaft of the second sub-transmission by only the fifth shift element, and the fifth shift element is borne in the axial direction between the two drive-side gear wheels of the seventh and eighth wheel planes by the second input shaft and is designed as a shift element that can be engaged on both sides.

13. The dual clutch transmission according to claim 11 , wherein, between the fifth wheel plane and the sixth wheel plane, the sixth shift element is arranged, which is a shift ele

Assignees

• Audi Ag

Inventors

• Hummel Steffen

Classifications

• F16H2003/0822

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

• F16H3/006 Primary

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

• F16H2003/0803

  with countershafts coaxial with input or output shaft · CPC title

• 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