Transmission for a motor vehicle, drive train and method for operating a transmission

Patent metadata

Field	Value
Publication number	US-11254199-B2
Application number	US-201816770456-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Dec 8, 2017
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A transmission (G) includes an input shaft (GW1), an output shaft (GW2), an electric machine (EM), a plurality of planetary gear sets (P1-P3; 2P1-2P5), and gear-implementing shift elements (S1-S6; 2S1-2S5). Via engagement of a first of the gear-implementing shift elements (S1, 2S1), which is a force-locking shift element having a variable torque transmission capacity, the input shaft (GW1) and an element (E1, 22E1) of one of the planetary gear sets (P3; 2P4) can be brought into a fixed rotational speed relationship with respect to each other. Another element (E2, 22E2a, 22E2b) of one of the planetary gear sets (P1, 2P3, 2P5) is permanently connected to a rotor (R) of the electric machine (EM). By engaging an auxiliary shift element (ZS, 2ZSa, 2ZSb), which is a form-locking shift element, the rotor (R) and the input shaft (GW1) can be brought into a fixed rotational speed relationship with respect to each other.

First claim

The invention claimed is:

1. A transmission (G) for a motor vehicle, comprising:
an input shaft (GW 1 );
an output shaft (GW 2 );
an electric machine (EM);
a torque-transmitting interface (GW 1 A) to a transmission-external internal combustion engine (VM); and
a plurality of planetary gear sets (P 1 -P 3 ; 2 P 1 - 2 P 5 ),
wherein the transmission (G) is configured for providing a plurality of gears ( 1 - 8 , 1 R; 21 - 28 , 2 R) between the input shaft (GW 1 ) and the output shaft (GW 2 ) via selective engagement of gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ),
wherein the torque-transmitting interface (GW 1 A) is connected to the input shaft (GW 1 ) in a permanently rotationally fixed manner or torsionally elastic manner,
wherein, by actuating a first force-locking shift element of the gear-implementing shift elements (S 1 , 2 S 1 ) having a variable torque transmission capacity, the input shaft (GW 1 ) and a first element (E 1 , 22 E 1 ) of the planetary gear sets (P 3 ; 2 P 4 ) are engageable to fix a rotational speed relationship between the input shaft (GW 1 ) and the first element (E 1 , 22 E 1 ) of the planetary gear sets (P 3 ; 2 P 4 ),
wherein a second element (E 2 , 22 E 2 a , 22 E 2 b ) of the planetary gear sets (P 1 , 2 P 3 , 2 P 5 ) is permanently connected to a rotor (R) of the electric machine (EM),
wherein an auxiliary form-locking shift element (ZS, 2 ZSa, 2 ZSb) is configured such that actuation of the auxiliary form-locking shift element (ZS, 2 ZSa, 2 ZSb) establishes a fixed rotational speed relationship between the rotor (R) and the input shaft (GW 1 ),
wherein the transmission has a permanent connection between the input shaft (GW 1 ) and a third element (E 3 ) of the planetary gear sets ( 2 P 5 ),
wherein, by engaging the auxiliary shift element ( 2 ZSb), a fourth element (E 4 ) of the planetary gear sets ( 2 P 5 ) is rotationally fixable, and
wherein the third and fourth elements are both elements of one of the planetary gear sets ( 2 P 5 ).

2. The transmission (G) of claim 1 , wherein the second, third, and fourth elements are all elements of the one of the planetary gear sets ( 2 P 5 ).

3. A drive train for a motor vehicle, comprising the transmission (G) of claim 1 .

4. A method for operating the transmission (G) of claim 1 , comprising forming a plurality of gears ( 1 - 8 , 1 R; 21 - 28 , 2 R) between the input shaft (GW 1 ) and the output shaft (GW 2 ) via selective engagement of the gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ), wherein the auxiliary shift element (ZS, 2 ZSa, 2 ZSb) is engaged in each of the plurality of gears ( 1 - 8 , 1 R; 21 - 28 , 2 R).

5. A method for operating the transmission (G) of claim 1 , comprising forming at least one gear step ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ) between the rotor (R) and the output shaft (GW 2 ) via selective engagement of a subset of the gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ), wherein the auxiliary shift element (ZS, 2 ZSa, 2 ZSb) is disengaged in the at least one gear step ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ).

6. The method of claim 5 , wherein multiple gear steps ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ) are formable between the rotor (R) and the output shaft (GW 2 ) via selective engagement of the subset of the gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ), wherein the auxiliary shift element (ZS, 2 ZSa, 2 ZSb) is disengaged in each gear step of the multiple gear steps ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ).

7. The method of claim 5 , further comprising accelerating an internal combustion engine (VM) connected to the input shaft (GW 1 ) of the transmission (G) in a torsionally elastic manner from a stationary condition to a starting speed beginning from an operation of the transmission (G) in the at least one gear step ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ) by at least partially engaging the first force-locking shift element (S 1 , 2 S 1 ).

8. The method of claim 7 , further comprising, after the internal combustion engine (VM) accelerates to the starting speed, completely engaging the first force-locking shift element (S 1 , 2 S 1 ) only after engagement of the auxiliary shift element (ZS, 2 ZSa, 2 ZSb).

9. The method of claim 8 , wherein completely engaging the first force-locking shift element (S 1 , 2 S 1 ) comprises completely engaging the first force-locking shift element (S 1 , 2 S 1 ) during a gear change operation of the transmission (G), another one of the gear-implementing shift elements (S 2 -S 6 , 2 S 2 - 2 S 5 ) disengaging during the gear change operation.

10. The method of claim 7 , further comprising:
after the internal combustion engine (VM) accelerates to the starting speed, completely engaging the first force-locking shift element; and
subsequently, disengaging another one of the gear-implementing shift elements (S 2 -S 6 , 2 S 2 - 2 S 5 ) involved in the at least one gear step ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ).

11. A method for operating a transmission (G) that comprises an input shaft (GW 1 ), an output shaft (GW 2 ), an electric machine (EM), a torque-transmitting interface (GW 1 A) to a transmission-external internal combustion engine (VM), and a plurality of planetary gear sets (P 1 -P 3 ; 2 P 1 - 2 P 5 ), the transmission (G) is configured for providing a plurality of gears ( 1 - 8 , 1 R; 21 - 28 , 2 R) between the input shaft (GW 1 ) and the output shaft (GW 2 ) via selective engagement of gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ), the torque-transmitting interface (GW 1 A) is connected to the input shaft (GW 1 ) in a permanently rotationally fixed manner or torsionally elastic manner, the input shaft (GW 1 ) and a first element (E 1 , 22 E 1 ) of the planetary gear sets (P 3 ; 2 P 4 ) are engageable to fix a rotational speed relationship between the input shaft (GW 1 ) and the first element (E 1 , 22 E 1 ) of the planetary gear sets (P 3 ; 2 P 4 ) by actuating a first force-locking shift element of the gear-implementing shift elements (S 1 , 2 S 1 ) having a variable torque transmission capacity, a second element (E 2 , 22 E 2 a , 22 E 2 b ) of the planetary gear sets (P 1 , 2 P 3 , 2 P 5 ) is permanently connected to a rotor (R) of the electric machine (EM), and an auxiliary form-locking shift element (ZS, 2 ZSa, 2 ZSb) is configured such that actuation of the auxiliary form-locking shift element (ZS, 2 ZSa, 2 ZSb) establishes a fixed rotational speed relationship between the rotor (R) and the input shaft (GW 1 ), the method comprising:
forming a plurality of gears ( 1 - 8 , 1 R; 21 - 28 , 2 R) between the input shaft (GW 1 ) and the output shaft (GW 2 ) via selective engagement of the gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ),
wherein the auxiliary shift element (ZS, 2 ZSa, 2 ZSb) is engaged in each of the plurality of gears ( 1 - 8 , 1 R; 21 - 28 , 2 R).

12. The method of claim 11 , further comprising:
forming at least one gear step ( 1 E 1 , 1 E 2 , 1 E 3 , 1 E 4 , 1 E 5 , 1 E 6 ; 2 E 1 , 2 E 2 , 2 E 3 , 2 E 4 ) between the rotor (R) and the output shaft (GW 2 ) via selective engagement of a subset of the gear-implementing shift elements (S 1 -S 6 ; 2 S 1 - 2 S 5 ),
wherein the auxiliary shift element (ZS, 2 ZSa, 2 ZSb) is disengaged in the at least one

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Brehmer Martin
• Beck Stefan
• Fritzer Anton
• Hendrawan Suryanto
• Horn Matthias
• Kaltenbach Johannes
• Kuberczyk Raffael
• Moraw Jens
• Niederbrucker Gerhard
• Rattay Martin
• Reisch Matthias
• Rieger Wolfgang
• Rosemeier Thomas
• Turner Lara Ruth
• Unseld Bernd
• Warth Viktor
• Wechs Michael
• Ziemer Peter
• Bayer Oliver

Classifications

• F16H3/66

  composed of a number of gear trains without drive passing from one train to another · CPC title

• F16H2200/2064

  using at least one positive clutch, e.g. dog clutch · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/2048

  with seven engaging means · CPC title

• F16H2200/201

  with three sets of orbital gears · CPC title