Dual Clutch Transmission

Patent metadata

Field	Value
Publication number	US-2016298733-A1
Application number	US-201415036754-A
Country	US
Kind code	A1
Filing date	Nov 4, 2014
Priority date	Nov 15, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

The invention relates to a dual clutch transmission comprising two input shafts ( 11 a, 12 a; 11 b, 12 b ) which are provided for respectively linking to a power shift clutch (K 1 a, K 2 a; K 1 b, K 2 b ), a first countershaft ( 13 a; 13 b ) arranged offset parallel to the input shafts ( 11 a, 12 a; 11 b, 12 b ), a second countershaft ( 14 a; 14 b ) arranged offset parallel to the input shafts ( 11 a, 12 a; 11 b, 12 b ), at least five gear wheel planes (Z 1 a -Z 5 a; Z 1 b -Z 5 b ) which each comprise a fixed gear (Z 11 a -Z 51 a; Z 11 b -Z 51 b ) permanently connected in a rotationally fixed manner to one of the input shafts ( 11 a, 12 a; 11 b, 12 b ), wherein one of the gear wheel planes (Z 4 a; Z 4 b ) comprises an idler gear wheel (Z 42 a; Z 42 b ) arranged coaxially relative to the first countershaft ( 13 a; 13 b ) and an idler gear wheel (Z 43 a; Z 43 b ) arranged coaxially relative to the second countershaft ( 14 a; 14 b ), which form a gear wheel pair for shifting into at least one reverse transmission gear (R 1 a, R 2 a ), at least nine shift units (S 1 a -S 9 a; S 1 b -S 9 b ) for producing an operative connection between the input shafts ( 11 a, 12 a; 11 b, 12 b ) and/or the countershafts ( 13 a, 14 a; 13 b, 14 b ), which in connection with the gear wheel planes (Z 1 a -Z 5 a; Z 1 b -Z 5 b ) are provided at least constructively for shifting of at least eight sequentially shiftable forward transmission gears (V 1 a -V 8 a ) and the at least one reverse transmission gear (R 1 a, R 2 a), an output (Z 01 a; Z 01 b ) permanently connected in a rotationally fixed manner to the first countershaft ( 13 a; 13 b ), and an output gear wheel (Z 02 a; Z 02 b ) permanently connected to in a rotationally fixed manner to the second countershaft ( 14 a; 14 b ).

First claim

1 . A dual clutch transmission comprising two input shafts ( 11 a, 12 a; 11 b, 12 b ) which are provided for respectively linking to a power shift clutch (K 1 a, K 2 a; K 1 b, K 2 b ), a first countershaft ( 13 a; 13 b ) arranged offset parallel to the input shafts ( 11 a, 12 a; 11 b, 12 b ), a second countershaft ( 14 a; 14 b ) arranged offset parallel to the input shafts ( 11 a, 12 a; 11 b, 12 b ), at least five gear wheel planes (Z 1 a -Z 5 a; Z 1 b -Z 5 b ) which each comprise a fixed gear wheel (Z 11 a -Z 51 a; Z 11 b -Z 51 b ) permanently connected in a rotationally fixed manner to one of the input shafts ( 11 a, 12 a; 11 b, 12 b ), wherein one of the gear wheel planes (Z 4 a; Z 4 b ) comprises an idler gear wheel (Z 42 a; Z 42 b ) arranged coaxially relative to the first countershaft ( 13 a; 13 b ) and an idler gear wheel (Z 43 a; Z 43 b ) arranged coaxially relative to the second countershaft ( 14 a; 14 b ), which form a gear wheel pair for shifting into at least one reverse transmission gear (R 1 a, R 2 a ), at least nine shift units (S 1 a -S 9 a; S 1 b -S 9 b ) for producing an operative connection between the input shafts ( 11 a, 12 a; 11 b, 12 b ) and/or the countershafts ( 13 a, 14 a; 13 b, 14 b ), which in connection with the gear wheel planes (Z 1 a -Z 5 a; Z 1 b -Z 5 b ) are provided at least constructively for shifting of at least eight sequentially shiftable forward transmission gears (V 1 a -V 8 a ) and the at least one reverse transmission gear (R 1 a, R 2 a ), an output (Z 01 a; Z 01 b ) permanently connected in a rotationally fixed manner to the first countershaft ( 13 a; 13 b ), and an output gear wheel (Z 02 a; Z 02 b ) permanently connected, in a rotationally fixed manner, to the second countershaft ( 14 a; 14 b ).

2 . The dual clutch transmission according to claim 1 , characterized in that the first gear wheel plane (Z 1 a; Z 1 b ) comprises one of the fixed gears (Z 11 a; Z 11 b ) permanently connected to the first input shaft ( 11 a; 11 b ), a first idler gear (Z 12 a; Z 12 b ) which is arranged coaxially relative to the first countershaft ( 13 a; 13 b ) and which together with the fixed gear (Z 11 a; Z 11 b ) of the first gear wheel plane (Z 1 a; Z 1 b ) forms a gear wheel pair for shifting at least the eighth forward transmission gear (V 8 a ), and a second idler gear (Z 13 a; Z 13 b ) which is arranged coaxially relative to the second countershaft ( 14 a; 14 b ) and which together with the fixed gear (Z 11 a; Z 11 b ) of the first gear wheel plane (Z 1 a; Z 1 b ) forms a gear wheel pair for shifting of at least the sixth forward transmission gear (V 6 a ), wherein one of the shift units (S 1 a; S 1 b ) is provided in order to connect the first idler gear (Z 12 a; Z 12 b ) of the first gear wheel plane (Z 1 a; Z 1 b ) and the first countershaft ( 13 a; 13 b ) to one another in a rotationally fixed manner, and one of the shift units (S 5 a; S 5 b ) is provided in order to connect the second idler gear (Z 13 a; Z 13 b ) of the first gear wheel plane (Z 1 a; Z 1 b ) and the second countershaft ( 14 a; 14 b ) to one another in a rotationally fixed manner.

3 . The dual clutch transmission according to claim 1 or 2 , characterized in that the second gear wheel plane (Z 2 a; Z 2 b ) comprises one of the fixed gears (Z 21 a; Z 21 b ) permanently connected to the first input shaft ( 11 a; 11 b ) in a rotationally fixed manner and an idler gear (Z 22 a; Z 22 b ) arranged coaxially relative to the first countershaft ( 13 a; 13 b ), which form a gear wheel pair for shifting of at least the fourth forward transmission gear (V 4 a ), wherein one of the shift units (S 2 a; S 2 b ) is provided in order to connect the idler gear (Z 22 a; Z 22 b ) of the second gear wheel plane (Z 2 a; Z 2 b ) and the first countershaft ( 13 a; 13 b ) to one another in a rotationally fixed manner.

4 . The dual clutch transmission according to one of the preceding claims, characterized in that the third gear wheel plane (Z 3 a, Z 3 b ) comprises one of the fixed gears (Z 31 a; Z 31 b ) permanently connected to the first input shaft ( 11 a; 11 b ) in a rotationally fixed manner and an idler gear (Z 33 a; Z 33 b ) arranged coaxially relative to the second countershaft ( 14 a; 14 b ), which form a gear wheel pair for shifting of at least the second forward gear (V 2 a ), wherein one of the shift units (S 6 a; S 6 b ) is provided in order to connect the idler gear (Z 33 a; Z 33 b ) of the third gear wheel plane (Z 3 a; Z 3 b ) and the second countershaft ( 14 a; 14 b ) to one another in a rotationally fixed manner.

5 . The dual clutch transmission according to one of the preceding claims, characterized in that the fourth gear wheel plane (Z 4 a; Z 4 b ) comprises one of the fixed gears (Z 41 a; Z 41 b ) permanently connected to the second input shaft ( 12 a; 12 b ) in a rotationally fixed manner and the gear wheel pair for shifting of the at least one reverse transmission gear (R 1 a; R 2 a ), wherein the first idler gear (Z 42 a; Z 42 b ), arranged coaxially relative to the first countershaft ( 13 a; 13 b ), of the fourth gear wheel plane (Z 4 a; Z 4 b ) and the fixed gear (Z 41 a; Z 41 b ) of the fourth gear wheel plane (Z 4 a; Z 4 b ) form a gear wheel pair for shifting of at least the third forward transmission gear (V 3 a ).

6 . The dual clutch transmission according to one of the preceding claims, characterized in that one of the shift units (S 3 a; S 3 b ) is provided in order to connect the first idler gear (Z 42 a; Z 42 b ) of the fourth gear wheel plane (Z 4 a; Z 4 b ) and the first countershaft ( 13 a; 13 b ) to one another in a rotationally fixed manner, and one of the shift units (S 7 a; S 7 b ) is provided in order to connect the second idler gear (Z 43 a; Z 43 b ) of the fourth gear wheel plane (Z 4 a; Z 4 b ) and the second countershaft ( 14 a; 14 b ) to one another in a rotationally fixed manner.

7 . The dual clutch transmission according to claim 5 or 6 , characterized in that the first idler gear (Z 42 b ) of the fourth gear wheel plane (Z 4 b ) comprises a dual toothing, wherein the fixed gear (Z 41 b ) of the fourth gear wheel plane (Z 4 b ) and the second idler gear (Z 43 b ) of the fourth gear wheel plane (Z 4 b ) are offset axially relative to one another and are permanently connected so as to mesh with the first idler gear (Z 42 b ) of the fourth gear wheel plane (Z 4 b ).

8 . The dual clutch transmission at least according to claims 3 and 5 , characterized in that one of the shift units (S 9 a; S 9 b ) is provided in order to connect the first idler gear (Z 42 a; Z 42 b ) of the fourth gear wheel plane (Z 4 a; Z 4 b ) and the idler gear (Z 22 a; Z 22 b ) of the second gear wheel plane (Z 2 a; Z 2 b ) directly to one another in a rotationally fixed manner.

9 . The dual clutch transmission according to one of the preceding claims, characterized in that the first gear wheel plane (Z 5 a; Z 5 b ) comprises one of the fixed gears (Z 51 a; Z 51 b ) permanently connected to the second input shaft ( 12 a; 12 b ), a first idler gear (Z 52 a; Z 52 b ) which is arranged coaxially relative to the first countershaft ( 13 a; 13 b ) and which together with the fixe

Assignees

• Daimler Ag

Inventors

• Bender Helmut
• Bou Romano Josep Maria
• Straub Heinrich
• Hahn Peter
• Sperrfechter Stefan
• Schweitzer Juergen
• Haerter Tobias
• Romaniak Jakub

Classifications

• F16H3/093 Primary

  with two or more countershafts · CPC title

• F16H2200/0086

  the gear ratios comprising two reverse 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

• F16H2200/006

  the gear ratios comprising eight forward speeds · CPC title

• F16H2003/0931

  each countershaft having an output gear meshing with a single common gear on the output shaft · CPC title