Dual clutch transmission for a motor vehicle

Patent metadata

Field	Value
Publication number	US-10837522-B2
Application number	US-201615551954-A
Country	US
Kind code	B2
Filing date	Jan 20, 2016
Priority date	Feb 19, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 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 with respectively a first sub-transmission and a second sub-transmission. Each sub-transmission has a respective input shaft and the two sub-transmissions have an output shaft, which is axis-parallel to the input shafts. The mutually coaxial input shafts can each be activated via a power-shift clutch in alternation 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 element.

First claim

The invention claimed is:

1. A dual clutch transmission for a motor vehicle comprising:
gear wheel sets, which can be engaged via shift elements and which form exactly eight wheel planes, which are arranged in succession in axial direction from the input side to the output side of the dual clutch transmission in the sequence first to eighth wheel plane, which are 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 and the two sub-transmissions have a common output shaft, which 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 the even forward gears are associated with the first sub-transmission, a lowest two odd forward gears are associated with either the first sub-transmission or the second sub-transmission, and the odd forward gears above the lowest two 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 respective input shaft, and an output-side gear wheel, which is mounted detachably or in torsionally resistant manner on the output shaft and meshes with the former gear wheel, which, by means of shift elements, can be coupled to the respective input shaft and to the output shaft, or decoupled therefrom, with the formation of forward gears, for engagement of the forward gears, the dual clutch transmission has exactly five shift elements, which can be engaged on both sides in an axial direction, and at least one shift element that can be engaged on one side;
wherein by the shift elements, exactly 12 forward gears can be engaged, and of the five shift elements that can be engaged on both sides, four shift elements are arranged on the input axis of the input shafts and one shift element, which can be engaged on both sides is arranged on the output shaft, and in that the shift element, which can be engaged on one side, is arranged on the output shaft.

2. The dual clutch transmission according to claim 1 , wherein at least two, and at most three, shift elements are arranged on the output shaft.

3. The dual clutch transmission according to claim 1 , wherein the forward gears, can be engaged by the first to seventh shift elements, respectively, as direct gears, for which, in the activated sub-transmission of the first or second sub-transmission, exactly one wheel plane is engaged in the flow of torque, and the forward gears, can be engaged by the first to seventh shift elements, respectively, as twist gears, for which, in the activated first or second sub-transmission, exactly three wheel planes are combined in series and engaged in the flow of torque.

4. The dual clutch transmission according to claim 1 , for engagement of the forward gears, at least two of the shift elements can be actuated.

5. The dual clutch transmission according to claim 1 , wherein the input shafts are free of wheel planes arranged thereon in a torsionally resistant manner, and each input shaft has exactly one shift element that can be engaged on both sides in axial direction, and by the first shift element, the first input shaft can be coupled to, or decoupled from, the first to fourth wheel planes of the first sub-transmission, and by the second shift element, the second input shaft can be coupled to, or decoupled from, the fifth to eighth wheel planes of the second sub-transmission.

6. The dual clutch transmission according to claim 5 , wherein a respective drive-side detached gear wheel of the first wheel plane, which is mounted on the first input shaft, and a drive-side hollow shaft of the first sub-transmission, which is coaxially mounted on the first input shaft, are arranged on both sides of the first shift element in the axial direction, and can be coupled in alternation to the first input shaft via the first shift element, and in that the drive-side hollow shaft of the first sub-transmission bears 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 can be coupled via the third shift element to the detachably mounted drive-side gear wheel of the fourth wheel plane.

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

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 can be coupled by means of the third shift element to the drive-side hollow shaft of the first sub-transmission.

10. The dual clutch transmission according to claim 5 , wherein, respectively, 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, are 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 coupled in alternation to the second input shaft via the second shift element, and the drive-side hollow shaft of the second sub-transmission bears 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 in that 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 coupled 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, which can be engaged on both sub-transmissions, can be coupled to the second sub-transmission by means of 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 coaxially and rotatably mounted on the output shaft.

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

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 coaxially and rotatably mounted on the output shaft.

16. The dual clutc

Assignees

• Audi Ag

Inventors

• Hummel Steffen

Classifications

• F16H2200/0082

  characterised by the number of reverse speeds · 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

• F16H2003/0803

  with countershafts coaxial with input or output shaft · CPC title

• F16H3/006 Primary

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