Power shift transmission

Patent metadata

Field	Value
Publication number	US-12044296-B2
Application number	US-202217647541-A
Country	US
Kind code	B2
Filing date	Jan 10, 2022
Priority date	Dec 20, 2021
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A power shift transmission includes a plurality of shafts, a plurality of gears, a plurality of clutches, a plurality of forward modes, and a plurality of alternate forward modes. Each forward mode has a distinct transmission ratio, and each alternate forward mode has a transmission ratio similar to one of the plurality of forward modes.

First claim

What is claimed is:

1. A power shift transmission, comprising:
a plurality of shafts including a first shaft, a second shaft, a third shaft, and a fourth shaft;
a plurality of gears including a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, a ninth gear, a tenth gear, an eleventh gear, a twelfth gear, a thirteenth gear, a fourteenth gear, a fifteenth gear, a sixteenth gear, a seventeenth gear, and an eighteenth gear;
a plurality of clutches including a first clutch, a second clutch, a third clutch, a fourth clutch, a fifth clutch, a sixth clutch, a seventh clutch, an eighth clutch, and a ninth clutch;
a plurality of forward modes, each forward mode including a distinct transmission ratio; and
a plurality of alternate forward modes, each alternate forward mode including a transmission ratio similar to one of the plurality of forward modes.

2. The power shift transmission of claim 1 , wherein:
the first shaft includes the first gear and the second gear;
the second shaft includes the third gear, the fourth gear, the fifth gear, the sixth gear, the seventh gear, and the eighth gear;
the third shaft includes the ninth gear, the tenth gear, the eleventh gear, the twelfth gear, the thirteenth gear, the fourteenth gear, and the fifteenth gear;
the fourth shaft includes the sixteenth gear, the seventeenth gear, and the eighteenth gear;
the first clutch having an engaged condition, which causes the second shaft to rotate relative to the first shaft based upon the engagement between the third gear and the first gear;
the second clutch having an engaged condition, which causes the second shaft to rotate relative to the first shaft based upon the engagement between the sixth gear and the second gear;
the third clutch having an engaged condition, which causes the third shaft to rotate relative to the second shaft based upon the engagement between the tenth gear and the fourth gear;
the fourth clutch having an engaged condition, which causes the third shaft to rotate relative to the second shaft based upon the engagement between the thirteenth gear and the seventh gear;
the fifth clutch having an engaged condition, which causes the third shaft to rotate relative to the second shaft based upon the engagement between the eleventh gear and the fifth gear;
the sixth clutch having an engaged condition, which causes the third shaft to rotate relative to the second shaft based upon the engagement between the fourteenth gear and the eighth gear;
the seventh clutch having an engaged condition, which causes the fourth shaft to rotate relative to the third shaft based upon the engagement between the seventeenth gear and the twelfth gear;
the eighth clutch having an engaged condition, which causes the fourth shaft to rotate relative to the third shaft based upon the engagement between the sixteenth gear and the ninth gear; and
the ninth clutch having an engaged condition, which causes the fourth shaft to rotate relative to the third shaft based upon the engagement between the eighteenth gear and the fifteenth gear.

3. The power shift transmission of claim 1 , wherein:
the plurality of forward modes includes at least twenty-one forward modes; and
the plurality of alternate forward modes includes at least three alternate forward modes.

4. The power shift transmission of claim 1 , wherein:
the plurality of forward modes includes a sixth forward mode and a seventh forward mode;
the plurality of alternate forward modes include an alternate sixth forward mode and an alternate seventh forward mode;
the sixth forward mode and the alternate sixth forward mode have similar transmission ratios; and
the seventh forward mode and the alternate seventh forward mode have similar transmission ratios.

5. The power shift transmission of claim 4 , wherein:
the plurality of forward modes includes an eighth forward mode;
the plurality of alternate forward modes include an alternate eighth forward mode; and
the eighth forward mode and the alternate eighth forward mode have similar transmission ratios.

6. The power shift transmission of claim 2 , wherein:
the plurality of forward modes includes a fifth forward mode and a shift step between the fifth forward mode and the sixth forward mode is between 10% and 20%.

7. The power shift transmission of claim 2 , wherein:
the transmission ratio of the alternate sixth forward mode is within 10% of the transmission ratio of the sixth forward mode;
the transmission ratio of the alternate seventh forward mode is within 10% of the transmission ratio of the seventh forward mode; and
the transmission ratio of the alternate eighth forward mode is within 10% of the transmission ratio of the eighth forward mode.

8. The power shift transmission of claim 2 , wherein:
the transmission ratio of the alternate sixth forward mode is within 5% of the transmission ratio of the sixth forward mode;
the transmission ratio of the alternate seventh forward mode is within 5% of the transmission ratio of the seventh forward mode; and
the transmission ratio of the alternate eighth forward mode is within 5% of the transmission ratio of the eighth forward mode.

9. The power shift transmission of claim 2 , wherein:
the transmission ratio of the alternate sixth forward mode is within 2% of the transmission ratio of the sixth forward mode;
the transmission ratio of the alternate seventh forward mode is within 2% of the transmission ratio of the seventh forward mode; and
the transmission ratio of the alternate eighth forward mode is within 2% of the transmission ratio of the eighth forward mode.

10. The power shift transmission of claim 1 , further comprising:
a first reverse gear operatively connected to the first shaft;
a second reverse gear operatively connected to a reverse shaft;
a reverse clutch having an engaged condition, which causes the second shaft to rotate relative to the first shaft based upon the engagement between the second reverse gear and the first reverse gear and the engagement between the fifth gear and the second reverse gear;
a plurality of reverse modes, each reverse mode including a distinct transmission ratio; and
at least one alternate reverse mode having a transmission ratio between any two of the reverse modes.

11. The power shift transmission of claim 10 , wherein:
the plurality of reverse modes includes a third reverse mode, a fourth reverse mode, and a fifth reverse mode;
the at least one alternate reverse mode includes an alternate fourth reverse mode; and
the fourth reverse mode and the alternate fourth reverse mode each have a transmission ratio between a transmission ratio of the third reverse mode and a transmission ratio of the fifth reverse mode.

12. The power shift transmission of claim 11 , wherein a shift step between the third reverse mode and the fourth reverse mode is between 25% and 35%.

13. The power shift transmission of claim 11 , wherein the transmission ratio of the alternate fourth reverse mode is within 20% of the transmission ratio of the fourth reverse mode.

14. A work vehicle including a power shift transmission, comprising:
a first shaft including a first gear and a second gear;
a second shaft including a third gear, a fourth gear, a fifth gear, a sixth gear, a seventh gear, and an eighth gear;
a third shaft including a ninth gear, a tenth gear, an eleventh gear, a twelfth gear, a thirteenth gear, a fourteenth gear, and a fifteenth gear;
a fourth shaft including a sixteenth gear, a seventeenth gear, and an eighteenth gear;
a first clutch having an engaged condition, which ca

Assignees

• Deere & Co

Inventors

• Stafsholt Kevin B
• Dostal Andrew D
• Shores Benjamin E
• Mcclain Brett D
• Behera Ajit R
• Mischel Amber R

Classifications

• F16H2003/0822

  characterised by the arrangement of at least one reverse gear · CPC title

• F16H2200/0078

  the gear ratio comprising twelve or more forward speeds · CPC title

• F16H2200/0082

  characterised by the number of reverse speeds · CPC title

• F16H2003/0818

  comprising means for power-shifting · CPC title

• F16H3/093 Primary

  with two or more countershafts · CPC title