Power-split continuously variable transmission device

Patent metadata

Field	Value
Publication number	US-10626969-B2
Application number	US-201816170715-A
Country	US
Kind code	B2
Filing date	Oct 25, 2018
Priority date	Oct 25, 2017
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A variator unit of a power-split continuously variable transmission is fixed to a rotationally fixed component and has a primary side rotationally fixed to an input shaft and a secondary side rotationally fixed to a first element of a second planetary gear set via a third shaft. A third element of a first planetary gear set is rotationally fixed via a fourth shaft to a second element of the second planetary gear set, which is fixable to the rotationally fixed component via a first shift element and connectable to the input shaft via a second shift element. A third element of the second planetary gear set is rotationally fixed via a fifth shaft to a first element of the first planetary gear set fixable to the rotationally fixed component via a third shift element. The second element of the first planetary gear set is rotationally fixed to an output shaft.

First claim

The invention claimed is:

1. A power-split continuously variable transmission device ( 100 ), comprising:
an input shaft ( 1 );
an output shaft ( 2 );
a first planetary gear set (RS 1 ) arranged between the input shaft ( 1 ) and the output shaft ( 2 );
a second planetary gear set (RS 2 ) connected to the first planetary gear set (RS 1 ) and arranged between the input shaft ( 1 ) and the output shaft ( 2 ); and
a variator unit ( 10 ) for transmitting power in a continuously variable manner from the input shaft ( 1 ) to the first planetary gear set (RS 1 ), the variator unit ( 10 ) having a first shift element (B 1 ), a second shift element (K 1 ) and a third shift element (B 2 ), selective actuation of the first, second and third shift elements (B 1 , K 1 , B 2 ) implements different power paths via the variator unit ( 10 ) and the first and second planetary gear sets (RS 1 , RS 2 ) while making a first mode (V 1 ), a second mode (V 2 ), and a third mode (R 1 ) available,
wherein the variator unit ( 10 ) is fixed to a rotationally fixed component (GG), a primary side ( 11 ) of the variator unit ( 10 ) is rotationally fixed to the input shaft ( 1 ), and a secondary side ( 12 ) of the variator unit is rotationally fixed to a first element (E 21 ) of the second planetary gear set (RS 2 ) via a third shaft ( 3 ),
wherein a third element (E 13 ) of the first planetary gear set (RS 1 ) is rotationally fixed to a second element (E 22 ) of the second planetary gear set (RS 2 ) via a fourth shaft ( 4 ), the second element (E 22 ) of the second planetary gear set (RS 2 ) fixable to the rotationally fixed component (GG) via the first shift element (B 1 ) and connectable to the input shaft ( 1 ) via the second shift element (K 1 ),
wherein a third element (E 23 ) of the second planetary gear set (RS 2 ) is rotationally fixed to a first element (E 11 ) of the first planetary gear set (RS 1 ) via a fifth shaft ( 5 ), the first element (E 11 ) of the first planetary gear set (RS 1 ) fixable to the rotationally fixed component (GG) via the third shift element (B 2 ), and
wherein the second element (E 12 ) of the first planetary gear set (RS 1 ) is rotationally fixed to the output shaft ( 2 ).

2. The transmission device ( 100 ) of claim 1 , wherein the variator unit ( 10 ) is a planetary roller variator.

3. The transmission device ( 100 ) of claim 1 , wherein the first and second planetary gear sets (RS 1 , RS 2 ) are arranged axially adjacent to each other.

4. The transmission device ( 100 ) of claim 1 , wherein the first planetary gear set (RS 1 ) is arranged radially outside the second planetary gear set (RS 2 ).

5. The transmission device ( 100 ) of claim 1 , wherein:
each of the first and second planetary gear sets (RS 1 , RS 2 ) is a minus planetary gear set;
the first element (E 11 ) of the first planetary gear set (RS 1 ) is a sun gear (SO 1 );
the second element (E 12 ) of the first planetary gear set (RS 1 ) is a planet carrier (PT 1 );
the third element (E 13 ) of the first planetary gear set (RS 1 ) is a ring gear (HO 1 );
the first element (E 21 ) of the second planetary gear set (RS 2 ) is a sun gear (SO 2 );
the second element (E 22 ) of the second planetary gear set (RS 2 ) is a planet carrier (PT 2 ); and
the third element (E 23 ) of the second planetary gear set (RS 2 ) is a ring gear (HO 2 ).

6. The transmission device ( 100 ) of claim 1 , wherein:
the first planetary gear set (RS 1 ) is a minus planetary gear set and the second planetary gear set (RS 2 ) is a plus planetary gear set;
the first element (E 11 ) of the first planetary gear set (RS 1 ) is a sun gear (SO 1 );
the second element (E 12 ) of the first planetary gear set (RS 1 ) is a planet carrier (PT 1 );
the third element (E 13 ) of the first planetary gear set (RS 1 ) is a ring gear (HO 1 );
the first element (E 21 ) of the second planetary gear set (RS 2 ) is a sun gear (SO 2 );
the second element (E 22 ) of the second planetary gear set (RS 2 ) is a ring gear (HO 2 ); and
the third element (E 23 ) of the second planetary gear set (RS 2 ) is a planet carrier (PT 2 ).

7. The transmission device ( 100 ) of claim 1 , wherein:
the first mode (V 1 ) is variable and implemented when the third shift element (B 2 ) is engaged, and/or
the second mode (V 2 ) is power-split and implemented when the second shift element (K 1 ) is engaged, and/or
the third mode (R 1 ) is variable and implemented when the first shift element (B 1 ) is engaged.

8. The transmission device ( 100 ) of claim 1 , further comprising an electric machine (EM), a rotor (R) of the electric machine (EM) is connected to the input shaft ( 1 ), the third shaft ( 3 ), the fourth shaft ( 4 ), the fifth shaft ( 5 ), one of the first, second, or third elements (E 11 , E 12 , E 13 , E 21 , E 22 , E 23 ) of the first and second planetary gear sets (RS 1 , RS 2 ) or to the output shaft ( 2 ).

9. The transmission device ( 100 ) of claim 8 , further comprising a separating clutch, the input shaft ( 1 ) rotationally fixable to a connecting shaft via the separating clutch.

10. The transmission device ( 100 ) of claim 8 , wherein the electric machine (EM) is arranged coaxially to the input shaft ( 1 ).

11. The transmission device ( 100 ) of claim 8 , wherein the electric machine (EM) is arranged axially parallel to the input shaft ( 1 ).

12. A motor vehicle drive train comprising the transmission device ( 100 ) of claim 1 .

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Beck Stefan
• Warth Viktor
• Wechs Michael
• Niederbrucker Gerhard
• Moraw Jens
• Turner Lara Ruth

Classifications

• B60K2006/4825

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

• B60Y2200/92

  Hybrid vehicles · CPC title

• B60K6/48

  Parallel type · CPC title

• F16H15/28

  with external friction surface · CPC title

• F16H3/66

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