MULTI-SPEED TRANSMISSION

• US 20150099603A1
• Filed: 10/04/2013
• Published: 04/09/2015
• Est. Priority Date: 10/04/2013
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Goleski, Gregory Daniel, Hoffman, Donald Edward, Lippert, Robert Scott
• Granted Patent: US 9,175,748 B2
• Time in Patent Office: Days
• US Class Current: 475/275
• CPC Class Codes: F16H 2200/0073 the gear ratios comprising eleven forward speeds
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 2200/2012 with four sets of orbital gears
• CPC Class Codes: F16H 2200/2041 with four engaging means
• CPC Class Codes: F16H 2200/2048 with seven engaging means
• CPC Class Codes: F16H 2200/2082 one freewheel mechanisms
• CPC Class Codes: F16H 3/62 Gearings having three or more central gears F16H3/68 - F16H3/78 take precedence
• CPC Class Codes: F16H 3/66 composed of a number of gear trains without drive passing from one train to another

Abstract

A transmission gearing arrangement produces eleven forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. One embodiment includes four simple planetary gear sets, four clutches, and two brakes. Another embodiment includes two axis transfer gear pairs, three simple planetary gear sets, four clutches, and two brakes. Each of these embodiments may include a one way brake such that the first shift is non-synchronous. A third embodiment includes four simple planetary gear sets, four brakes, and two clutches.

Claims

1. A transmission comprising:

an input;

an output;

first, second, third, fourth, and fifth shafts;

a first gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, the third shaft, and the fourth shaft;

a second gearing arrangement configured to selectively impose a proportional speed relationship between the second shaft and the output;

a third gearing arrangement configured to fixedly impose a linear speed relationship among the second shaft, the input, and the fifth shaft;

a fourth gearing arrangement configured to selectively impose a proportional speed relationship between the fifth shaft and the output;

a first brake configured to selectively hold the third shaft against rotation;

a second brake configured to selectively hold the fourth shaft against rotation;

a first clutch configured to selectively couple the input to the third shaft; and

a second clutch configured to selectively couple the input to the fourth shaft.

2. The transmission of claim 1 further comprising:

a third clutch configured to selectively couple the input to the first shaft.

3. The transmission of claim 2 further comprising:

a one way brake configured to passively restrain the third shaft from rotating in one direction while permitting rotation in the opposite direction.

4. The transmission of claim 1 further comprising:

a third brake configured to selectively hold the first shaft against rotation.

5. The transmission of claim 1 wherein the first gearing arrangement comprises:

a first simple planetary gear set having a first sun gear fixedly coupled to the fourth shaft, a first ring gear fixedly coupled to the second shaft, a first planet carrier fixedly coupled to the third shaft, and a first plurality of planet gears each supported for rotation with respect to the first planet carrier and in continuous meshing engagement with both the first sun gear and the first ring gear; and

a second simple planetary gear set having a second sun gear fixedly coupled to the first shaft, a second ring gear fixedly coupled to the third shaft, a second planet carrier fixedly coupled to the second shaft, and a second plurality of planet gears each supported for rotation with respect to the second planet carrier and in continuous meshing engagement with both the second sun gear and the second ring gear.

6. The transmission of claim 1 wherein the second gearing arrangement comprises:

a simple planetary gear set having a sun gear fixedly coupled to the second shaft, a ring gear, a planet carrier fixedly coupled to the output, and a plurality of planet gears each supported for rotation with respect to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear; and

a fourth brake configured to selectively hold the ring gear against rotation.

7. The transmission of claim 1 wherein the second gearing arrangement comprises:

a first axis transfer gear fixedly coupled to the second shaft;

a second axis transfer gear in continuous meshing engagement with the first axis transfer gear; and

a fourth clutch configured to selectively couple the second axis transfer gear to the output.

8. The transmission of claim 1 wherein the third gearing arrangement comprises:

a simple planetary gear set having a sun gear fixedly coupled to the second shaft, a ring gear fixedly coupled to the fifth shaft, a planet carrier fixedly coupled to the input, and a plurality of planet gears each supported for rotation with respect to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear.

9. The transmission of claim 1 wherein the fourth gearing arrangement comprises:

a fifth clutch configured to selectively couple the fifth shaft to the output.

10. The transmission of claim 1 wherein the fourth gearing arrangement comprises:

a third axis transfer gear fixedly coupled to the fifth shaft;

a fourth axis transfer gear in continuous meshing engagement with the third axis transfer gear; and

a fifth clutch configured to selectively couple the fourth axis transfer gear to the output.

11. A transmission comprising:

an input;

an output;

second, third, fourth, and fifth shafts;

a first gearing arrangement configured to fixedly impose a linear speed relationship among the second shaft, the third shaft, and the fourth shaft;

a second gearing arrangement configured to selectively impose a proportional speed relationship between the second shaft and the output;

a third gearing arrangement configured to fixedly impose a linear speed relationship among the second shaft, the input, and the fifth shaft;

a fourth gearing arrangement configured to selectively impose a proportional speed relationship between the fifth shaft and the output;

a first brake configured to selectively hold the third shaft against rotation;

a second brake configured to selectively hold the fourth shaft against rotation;

a first clutch configured to selectively couple the input to the third shaft; and

a second clutch configured to selectively couple the input to the fourth shaft.

12. The transmission of claim 11 further comprising:

a fifth gearing arrangement configured to selectively impose a linear speed relationship among the input, the second shaft, and the third shaft.

13. The transmission of claim 12 wherein the fifth gearing arrangement comprises:

a simple planetary gear set having a sun gear, a ring gear fixedly coupled to the third shaft, a planet carrier fixedly coupled to the second shaft, and a plurality of planet gears each supported for rotation with respect to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear; and

a third clutch configured to selectively couple the input to the sun gear.

14. The transmission of claim 12 further comprising:

a one way brake configured to passively restrain the third shaft from rotating in one direction while permitting rotation in the opposite direction.

15. The transmission of claim 11 further comprising:

a fifth gearing arrangement configured to selectively impose a proportional speed relationship between the second shaft and the third shaft.

16. The transmission of claim 15 wherein the fifth gearing arrangement comprises:

a simple planetary gear set having a sun gear, a ring gear fixedly coupled to the third shaft, a planet carrier fixedly coupled to the second shaft, and a plurality of planet gears each supported for rotation with respect to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear; and

a third brake configured to selectively hold the sun gear against rotation.

17. The transmission of claim 11 wherein the first gearing arrangement comprises:

a simple planetary gear set having a sun gear fixedly coupled to the fourth shaft, a ring gear fixedly coupled to the second shaft, a planet carrier fixedly coupled to the third shaft, and a plurality of planet gears each supported for rotation with respect to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear.

18. A transmission comprising:

an input;

an output;

an intermediate shaft;

a first gearing arrangement configured to selectively impose at least four distinct positive proportional speed ratios between the input and the intermediate shaft, the first gearing arrangement comprising a passive shift element that engages to transmit torque from the input to the intermediate shaft in the highest speed ratio and overruns in the remaining speed ratios;

a second gearing arrangement configured to selectively impose a proportional speed relationship between the intermediate shaft and the output; and

a third gearing arrangement configured to selectively impose a linear speed relationship among the intermediate shaft, the input, and the output.

19. The transmission of claim 18 wherein the first gearing arrangement comprises:

first, second, third, and fourth shafts;

a gearing arrangement configured to fixedly impose a linear speed relationship among the first shaft, the second shaft, the third shaft, and the fourth shaft;

a first brake configured to selectively hold the third shaft against rotation;

a second brake configured to selectively hold the fourth shaft against rotation;

a first clutch configured to selectively couple the input to the third shaft;

a second clutch configured to selectively couple the input to the fourth shaft;

a third clutch configured to selectively couple the input to the first shaft; and

a one way brake configured to passively restrain the third shaft from rotating in one direction while permitting rotation in the opposite direction.

20. A transmission comprising:

gearing-arrangement-1 fixedly imposing a linear speed relationship among shaft-1, shaft-2, shaft-3, and shaft-4;

gearing-arrangement-2 selectively imposing a proportional speed relationship between shaft-2 and an output;

gearing-arrangement-3 fixedly imposing a linear speed relationship among shaft-2, an input, and shaft-5;

brake-1 selectively holding shaft-3;

brake-2 selectively holding shaft-4;

clutch-1 selectively coupling the input to shaft-3;

clutch-2 selectively coupling the input to shaft-4; and

clutch-3 selectively coupling shaft-5 to the output.