Multi-ratio transmission

Patent metadata

Field	Value
Publication number	US-9382977-B2
Application number	US-201314376655-A
Country	US
Kind code	B2
Filing date	Jan 17, 2013
Priority date	Feb 6, 2012
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A multi-stage transmission having eight forward and one reverse gear includes planetary gearsets, shafts and shift elements. The sun gear of gearset (P 1 ) couples shaft ( 3 ), which can couple, via brake ( 03 ), the housing and couples the ring gear of gearset (P 3 ). The input shaft couples the carrier of gearset (P 1 ) and can couple, via clutch ( 15 ), shaft ( 5 ), which couples the ring and sun gears of respective gearsets (P 2, P 3 ). The ring gear of gearset (P 1 ) couples shaft ( 6 ) and the sun gear of gearset (P 2 ). Shaft ( 8 ) couples the carrier and sun gear of respective gearsets (P 3 , P 4 ). Shaft ( 4 ) couples the carrier of gearset (P 4 ) and can couple, via brake ( 04 ), the housing. The input shaft couples the ring gear of gearset (P 4 ) and, via clutch ( 27 ), couples shaft ( 7 ), which couples the carrier of gearset (P 2 ). Clutch ( 56, 67, 57 ) engages to block gearset (P 2 ).

First claim

The invention claimed is:

1. A multi-stage automatic transmission for a motor vehicle, the transmission comprising:
an input drive shaft ( 1 ) and an output shaft ( 2 );
first, second, third and fourth planetary gear sets (P 1 , P 2 , P 3 ) being arranged in a housing (G), and each of the first, the second, the third and the fourth planetary gear sets comprising a sun gear, a ring gear and a carrier;
at least third, fourth, fifth, sixth, seventh and eighth rotatable shafts ( 3 , 4 , 5 , 6 , 7 , 8 );
at least five shift elements ( 03 , 04 , 15 , 27 , 56 , 57 , 67 ) comprising first and second brakes ( 03 , 04 ) and first, second, and third clutches ( 15 , 27 , 56 , 57 , 67 ) whose selective engagement results in different transmission ratios between the input drive shaft ( 1 ) and the output shaft ( 2 ) so that eight forward gears and one reverse gear are implementable;
the third shaft ( 3 ) being connected to both the sun gear of the first planetary gear set (P 1 ) the ring gear of the third planetary gear set (P 3 ), and the third shaft ( 3 ) being couplable, by the first brake ( 03 ), to the housing (G);
the input drive shaft ( 1 ) being connected to the carrier of the first planetary gear set (P 1 ), the input drive shaft ( 1 ) being detachably connected, by the first clutch ( 15 ), to the fifth shaft ( 5 ), and the fifth shaft ( 5 ) being connected to both the ring gear of the second planetary gear set (P 2 ) and the sun gear of the third planetary gear set (P 3 );
the sixth shaft ( 6 ) being connected to both the ring gear of the first planetary gear set (P 1 ) and the sun gear of the second planetary gear set (P 2 );
the eighth shaft ( 8 ) being connected to the carrier of the third planetary gear set (P 3 ) and the sun gear of the fourth planetary gear set (P 4 );
the fourth shaft ( 4 ) being connected to the carrier of the fourth planetary gear set (P 4 ), and the fourth shaft ( 4 ) being couplable, by the second brake ( 04 ), to the housing (G);
the output shaft ( 2 ) being connected to the ring gear of the fourth planetary gear set (P 4 ), the output shaft ( 2 ) being detachably connected by the second clutch ( 27 ) to the seventh shaft ( 7 ), and the seventh shaft ( 7 ) being connected to the carrier of the second planetary gear set (P 2 ); and
the third clutch ( 56 , 67 , 57 ) being engagable to block the second planetary gear set (P 2 ).

2. The multi-stage transmission according to claim 1 , wherein the third clutch ( 56 ) detachably connects the fifth shaft ( 5 ) to the sixth shaft ( 6 ) so that, when the third clutch ( 56 ) is engaged, the second planetary gear set (P 2 ) is blocked by coupling the sun gear of the second planetary gear set (P 2 ) with the ring gear of the second planetary gear set (P 2 ).

3. The multi-stage transmission according to claim 1 , wherein the third clutch ( 67 ) detachably connects the sixth shaft ( 6 ) to the seventh shaft ( 7 ) so that, when the third clutch ( 67 ) is engaged, the second planetary gear set (P 2 ) is blocked by coupling the carrier of the second planetary gear set (P 2 ) with the sun gear of the second planetary gear set (P 2 ).

4. The multi-stage transmission according to claim 1 , wherein the third clutch ( 57 ) detachably connects the fifth shaft ( 5 ) to the seventh shaft ( 7 ) so that, when the third clutch ( 57 ) is engaged, the second planetary gear set (P 2 ) is blocked by coupling the carrier of the second planetary gear set (P 2 ) with the ring gear of the second planetary gear set (P 2 ).

5. The multi-stage transmission according to claim 1 , wherein the first, the second and the third planetary gear sets (P 1 , P 2 , P 3 ) are designed as minus planetary gear sets, and the fourth planetary gear set (P 4 ) is designed as a plus planetary gear set.

6. The multi-stage transmission according to claim 1 , wherein, when viewed in an axial direction, the first, the second, the third and the fourth planetary gear sets (P 1 , P 2 , P 3 , P 4 ) are disposed in a sequence of the first planetary gear set (P 1 ), the second planetary gear set (P 2 ), the third planetary gear set (P 3 ), and the fourth planetary gear set (P 4 ).

7. The multi-stage transmission according to claim 1 , wherein an electric machine (E) is connected to the input drive shaft ( 1 ) of the transmission.

8. The multi-stage transmission according to claim 1 , wherein an electric machine (E) is connected to the input drive shaft ( 1 ) of the transmission by either a gear stage or a chain drive.

9. The multi-stage transmission according to claim 7 , wherein a combustion motor is disconnectable from the transmission by a fourth clutch (K 0 ), whereby all transmission gears can be driven purely electrically.

10. The multi-stage transmission according to claim 8 , wherein a combustion motor is disconnectable from the transmission by a fourth clutch (K 0 ), whereby all transmission gears can be driven purely electrically.

11. The multi-stage transmission according to claim 1 , wherein the third clutch ( 56 ) detachably connects the fifth shaft ( 5 ) to the sixth shaft ( 6 ), and a first forward gear is implemented by engagement of the first and the second brakes ( 03 , 04 ) and the first clutch ( 15 ),
a second forward gear is implemented by engagement of the first and the second brakes ( 03 , 04 ) and the third clutch ( 56 ),
a third forward gear is implemented by engagement of the second brake ( 04 ) and the first and the third clutches ( 15 , 56 ),
a fourth forward gear is implemented by engagement of the second brake ( 04 ) and the second and the third clutches ( 27 , 56 ),
a fifth forward gear is implemented by engagement of the second brake ( 04 ) and the first and the second clutches ( 15 , 27 ),
a sixth forward gear is implemented by engagement of the first, the second and the third clutches ( 15 , 27 , 56 ),
a seventh forward gear is implemented by engagement of the first brake ( 03 ) and the first and the second clutches ( 15 , 27 ),
an eighth forward gear is implemented by engagement of the first brake ( 03 ) and the second and the third clutches ( 27 , 56 ), and
the reverse gear is implemented by engagement of the first and the second brakes ( 03 , 04 ) and the second clutch ( 27 ).

12. The multi-stage transmission according to claim 1 , wherein the third clutch ( 67 ) detachably connects the sixth shaft ( 6 ) to the seventh shaft ( 7 ), and a first forward gear is implemented by engagement of the first and the second brakes ( 03 , 04 ) and the first clutch ( 15 ),
a second forward gear is implemented by engagement of the first and the second brakes ( 03 , 04 ) and the third clutch ( 67 ),
a third forward gear is implemented by engagement of the second brake ( 04 ) and the first and the third clutches ( 15 , 67 ),
a fourth forward gear is implemented by engagement of the second brake ( 04 ) and the second and the third clutches ( 27 , 67 ),
a fifth forward gear is implemented by engagement of the second brake ( 04 ) and the first and the second clutches ( 15 , 27 ),
a sixth forward gear is implemented by engagement of the first, the second and the third clutches ( 15 , 27 , 67 ),
a seventh forward gear is implemented by engagement of the first brake ( 03 ) and the first and the second clutches ( 15 , 27 ),
an eighth forward gear is implemented by engagement of the first brake ( 03 ) and the second and the third clutches ( 27 , 67 ), and
the reverse gear is implemented by engagement of the first and the second brakes ( 03 , 04 ) and the second clutch ( 27 ).

13. The multi-stage transmission according to claim 1 , wherein the third clutch ( 57 ) detachably co

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Beck Stefan
• Wehlen Timo

Classifications

• F16H2200/2043

  with five engaging means · CPC title

• F16H3/666 Primary

  with intermeshing orbital gears (F16H3/663 takes precedence) · CPC title

• B60K2006/4825

  Electric machine connected or connectable to gearbox input shaft · CPC title

• F16H2200/2012

  with four sets of orbital gears · CPC title

• Y02T10/6252

  Cross-Sectional Technologies · mapped topic