Single clutch layshaft transmission

• US 7,107,866 B2
• Filed: 03/18/2004
• Issued: 09/19/2006
• Est. Priority Date: 03/18/2004
• Status: Expired due to Fees

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Janson, David, Baldwin, Reid
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US10/803,835
• Publication Number:
  US 20050204842A1
• Time in Patent Office: 915 Days
• Field of Search: 743/29, 743/31, 743/33
• US Class Current: 74/331
• CPC Class Codes: F16H 2003/0811 using unsynchronised clutches
• CPC Class Codes: F16H 2003/0818 comprising means for power-shifting
• CPC Class Codes: F16H 2200/0047 the gear ratios comprising five forward speeds
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/097 the input and output shafts being aligned on the same axis
• CPC Class Codes: Y10T 74/19233 Plurality of counter shafts
• CPC Class Codes: Y10T 74/19242 Combined gear and clutch

Abstract

A transmission includes an input, a first layshaft, a second layshaft, a first power path for transmitting power between the input and first layshaft and producing a first ratio of a speed of the first layshaft and a corresponding speed of the input, a second power path for transmitting power between the input and second layshaft and producing a second ratio of the speed of the second layshaft and corresponding speed of the input; and a clutch for releasably connecting the input and the output.

Claims

1. A multiple speed ratio power transmission, comprising:

an input supported for rotation;

an input shaft;

a first layshaft supported for rotation;

a second layshaft supported for rotation;

a first power path continually driveably connected to the input shaft for transmitting power between the input shaft and first layshaft, and producing a first ratio of a speed of the first layshaft and a speed of the input;

a second power path for transmitting power between the input and second layshaft, and producing a second ratio of a speed of the second layshaft and a speed of the input;

a clutch for driveably connecting and disconnecting the input and the input shaft;

an output supported for rotation; and

a coupler for driveably connecting and disconnecting the output and the second power path.

2. The transmission of claim 1, further comprising:

a one-way drive connection between the second layshaft and the input shaft.

3. The transmission of claim 1, wherein the second ratio is less than the first ratio.

4. The transmission of claim 1, wherein:

the first power path comprises a first pinion driveably connected to the input shaft, and a first gear driveably connected to the first layshaft, in meshing engagement with the first pinion; and

the second power path comprises a second pinion journalled on the input, and a second gear driveably connected to the second layshaft, in meshing engagement with the second pinion.

5. The transmission of claim 1, wherein:

the first power path comprises a first pinion driveably connected to the input shaft, and a first gear driveably connected to the first layshaft, in meshing engagement with the first pinion.

6. The transmission of claim 1, wherein:

the second power path comprises a second pinion journalled on the input, and a second gear driveably connected to the second layshaft, in meshing engagement with the second pinion; and

the coupler driveably connects and disconnects alternately the output and the second pinion.

7. A multiple speed power transmission for motor vehicles, comprising:

an input;

an input shaft;

a first layshaft supported for rotation;

a second layshaft supported for rotation;

a first power path continually driveably connected to the input shaft for transmitting power between the input shaft and first layshaft, and producing a first ratio of a speed of the first layshaft and a speed of the input;

a second power path for transmitting power through a one-way drive connection between the input and second layshaft, and producing a second ratio of a speed of the second layshaft and a speed of the input;

a clutch for driveably connecting and disconnecting the input and the input shaft;

an output supported for rotation; and

a first coupler for driveably connecting and disconnecting the output and the second power path.

8. The transmission of claim 7, further comprising:

a first pinion journalled on the first layshaft;

a second pinion journalled on the second layshaft;

a first gear supported on the output, in meshing engagement with the first pinion and second pinion;

a second coupler for connecting and disconnecting alternately the first pinion and first layshaft; and

a third coupler for connecting and disconnecting alternately the second pinion and second laysbaft.

9. The transmission of claim 7, wherein the one-way drive connection is a member of the group consisting of a one-way clutch, a sprag one-way clutch, a roller- one-way clutch, and a mechanical diode having an engaged state wherein the second layshaft and input are driveably connected and a disengaged state wherein the second layshaft and input are driveably disconnected.

10. The transmission of claim 8, wherein each of the first coupler, second coupler and third coupler is a member of a group consisting of a synchronizer and a dog clutch.

12. The transmission of claim 8, wherein:

the first power path comprises a third pinion driveably connected to the input shaft, and a third gear secured to the first layshaft in meshing engagement with said third pinion; and

the second power path comprises a one-way clutch driveably connected to the input, a fourth pinion secured to the one-way clutch, and a fourth gear secured to the second layshaft in meshing engagement with said fourth pinion.

13. The transmission of claim 7, wherein the second speed ratio is less than the first speed ratio.

11. The transmission of 7, wherein the clutch is a friction clutch.

14. A multiple speed power transmission for motor vehicles, comprising:

an input;

an input shaft;

a first layshaft;

a second layshaft;

a first power path continually secured to the input shaft for transmitting power between the input shaft and first layshaft, and producing a first ratio of a speed of the first layshaft and a speed of the input;

a second power path for transmitting power through a one-way drive connection between the input and second layshaft, and producing a second ratio less than a first ratio of a speed of the second layshaft and a speed of the input;

a clutch for driveably connecting and disconnecting the input and the input shaft;

an output; and

a first coupler for driveably connecting and disconnecting the output and the second power path.

15. The transmission of claim 14, further comprising:

a first pinion supported on the first layshaft;

a second pinion supported on the second layshaft;

a first gear supported on the output, in meshing engagement with the first pinion and second pinion;

a second coupler for connecting and disconnecting alternately the first pinion and first layshaft; and

a third coupler for connecting and disconnecting alternately the second pinion and second layshaft.

16. The transmission of claim 14, wherein the one-way drive connection is a member of the group consisting of a one-way clutch, a sprag one-way clutch, a roller- one-way clutch and, a mechanical diode, having an engaged state wherein the second layshaft and input are driveably connected and a disengaged state wherein the second layshaft and input are driveably disconnected.

17. The transmission of claim 15, wherein each of the first coupler, second coupler and third coupler is a member of a group consisting of a synchronizer and a dog clutch.

19. The transmission of claim 14, wherein:

the first power path comprises a third pinion secured to the input shaft, and a third gear secured to the first layshaft in meshing engagement with the third pinion; and

the second power path comprises a one-way clutch secured to the input, a fourth pinion driveably connected to the one-way clutch, and a fourth gear secured to the second layshaft in meshing engagement with said fourth pinion.

18. The transmission of 14, wherein the clutch is a friction clutch.