Lockup clutch for powersplit hybrid transmission

Patent metadata

Field	Value
Publication number	US-10543740-B2
Application number	US-201715666157-A
Country	US
Kind code	B2
Filing date	Aug 1, 2017
Priority date	Aug 1, 2017
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A powertrain includes an engine and an electric machine. The powertrain further includes a planetary gearset including a a first rotatable element fixedly coupled to an engine crankshaft, a second rotatable element fixedly coupled to the electric machine, and a third rotatable element driveably connected to an intermediate shaft. The powertrain further includes a lockup clutch configured to selectively couple two of the first rotatable element, the second rotatable element, and the third rotatable element.

First claim

What is claimed is:

1. A powertrain comprising:
an engine;
an electric machine;
a planetary gearset including a planetary carrier assembly fixedly coupled to an engine crankshaft, a sun gear fixedly coupled to the electric machine, and a ring gear driveably connected to an intermediate shaft;
a lockup clutch configured to selectively couple two of the planetary carrier assembly, the sun gear, and the ring gear;
a second electric machine driveably connected to the intermediate shaft;
a gearing assembly configured to alternately selectively establish a plurality of proportional speed relationships between the intermediate shaft and an output shaft;
a second planetary gearset having a second sun gear, a second planetary carrier assembly, and a second ring gear fixedly coupled to the output shaft;
a third planetary gearset having a third sun gear fixedly coupled to the intermediate shaft, a third planetary carrier assembly fixedly coupled to the output shaft, and a third ring gear selectively coupled to the second planetary carrier assembly;
a first brake configured to selectively hold the second sun gear against rotation; and
a second brake configured to selectively hold the second planetary carrier assembly against rotation.

2. The powertrain of claim 1 wherein the plurality of proportional speed relationships includes four positive speed relationships and one negative speed relationship.

3. The powertrain of claim 1 wherein the second sun gear is selectively coupled to the intermediate shaft.

4. The powertrain of claim 1 wherein the gearing assembly further comprises:
a clutch configured to selectively couple the intermediate shaft to the second planetary carrier assembly.

5. A powertrain comprising:
an engine;
an electric machine;
a planetary gearset including a planetary carrier assembly fixedly coupled to an engine crankshaft, a sun gear fixedly coupled to the electric machine, and a ring gear driveably connected to an intermediate shaft;
a lockup clutch configured to selectively couple two of the two of the planetary carrier assembly, the sun gear, and the ring gear;
a second electric machine driveably connected to the intermediate shaft; and
a gearing assembly configured to alternately selectively establish a plurality of proportional speed relationships between the intermediate shaft and an output shaft;
a second planetary gearset having a second sun gear, a second planetary carrier assembly, and a second ring gear fixedly coupled to the output shaft;
a third planetary gearset having a third sun gear selectively coupled to the intermediate shaft, a third planetary carrier assembly fixedly coupled to the output shaft, and a third ring gear fixedly coupled to the second planetary carrier assembly;
a first brake configured to selectively hold the second sun gear against rotation; and
a second brake configured to selectively hold the second planetary carrier assembly against rotation.

6. The powertrain of claim 5 wherein the second sun gear is selectively coupled to the intermediate shaft.

7. The powertrain of claim 5 wherein the gearing assembly further comprises:
a clutch configured to selectively couple the intermediate shaft to the second planetary carrier assembly.

8. A powertrain comprising:
an engine;
an electric machine;
a planetary gearset including a planetary carrier assembly fixedly coupled to an engine crankshaft, a sun gear fixedly coupled to the electric machine, and a ring gear driveably connected to an intermediate shaft;
a lockup clutch configured to selectively couple two of the two of the planetary carrier assembly, the sun gear, and the ring gear;
a second electric machine driveably connected to the intermediate shaft; and
a gearing assembly configured to alternately selectively establish a plurality of proportional speed relationships between the intermediate shaft and an output shaft;
a second planetary gearset having a second sun gear selectively coupled to the intermediate shaft, a second planetary carrier assembly, and a second ring gear;
a third planetary gearset having a third sun gear fixedly coupled to the second sun gear, a third planetary carrier assembly fixedly coupled to the output shaft, and a third ring gear fixedly coupled to the second planetary carrier assembly;
a first brake configured to selectively hold the second ring gear against rotation; and
a second brake configured to selectively hold the third ring gear against rotation.

9. The powertrain of claim 8 wherein the second ring gear is selectively coupled to the intermediate shaft.

10. The powertrain of claim 8 wherein the gearing assembly further comprises:
a clutch configured to selectively couple the intermediate shaft to the second planetary carrier assembly.

11. A powertrain comprising:
an engine;
an electric machine;
a planetary gearset including a planetary carrier assembly fixedly coupled to an engine crankshaft, a sun gear fixedly coupled to the electric machine, and a ring gear driveably connected to an intermediate shaft;
a lockup clutch configured to selectively couple two of the two of the planetary carrier assembly, the sun gear, and the ring gear;
a second electric machine driveably connected to the intermediate shaft; and
a gearing assembly configured to alternately selectively establish a plurality of proportional speed relationships between the intermediate shaft and an output shaft;
a second planetary gearset having a second sun gear selectively coupled to the intermediate shaft, a second planetary carrier assembly selectively coupled to the intermediate shaft, and a second ring gear fixedly coupled to the output shaft;
a third planetary gearset having a third sun gear, a third planetary carrier assembly fixedly coupled to the output shaft, and a third ring gear fixedly coupled to the second planetary carrier assembly; and
a first brake configured to selectively hold the third sun gear against rotation.

12. The powertrain of claim 11 wherein the gearing assembly further comprises:
a second brake configured to selectively hold the second planetary carrier assembly against rotation.

13. The powertrain of claim 11 wherein the gearing assembly further comprises:
a third brake configured to selectively hold the second sun gear against rotation.

14. A powertrain comprising:
an engine;
an electric machine;
a planetary gearset including a planetary carrier assembly fixedly coupled to an engine crankshaft, a sun gear fixedly coupled to the electric machine, and a ring gear driveably connected to an intermediate shaft;
a lockup clutch configured to selectively couple two of the planetary carrier assembly, the sun gear, and the ring gear;
a second electric machine driveably connected to the intermediate shaft; and
a gearing assembly configured to alternately selectively establish a plurality of proportional speed relationships between the intermediate shaft and an output shaft;
a second planetary gearset having a second sun gear selectively coupled to the intermediate shaft, a second planetary carrier assembly selectively coupled to the intermediate shaft, and a second ring gear fixedly coupled to the output shaft;
a third planetary gearset having a third sun gear fixedly coupled to the second sun gear, a third planetary carrier assembly fixedly coupled to the output shaft, and a third ring gear; and
a first brake configured to selectively hold the third ring gear against rotation.

15. The powertrain of claim 14 wherein the gearing assembly further comprises:
a second brake configured to selectively hold the second planeta

Assignees

• Ford Global Tech Llc

Inventors

• Oh David Gon
• Janson David Allen
• Goleski Gregory Daniel
• Hammond Matthew David

Classifications

• F16H2200/2043

  with five engaging means · CPC title

• Y10S903/919

  Stepped shift · CPC title

• B60K2006/381

  characterized by driveline brakes · CPC title

• F16H2200/0043

  the gear ratios comprising four forward speeds · CPC title

• B60K6/387

  Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means · CPC title