Powershift transmission with twenty-seven forward modes

Patent metadata

Field	Value
Publication number	US-9879761-B2
Application number	US-201414528220-A
Country	US
Kind code	B2
Filing date	Oct 30, 2014
Priority date	Oct 30, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

In accordance with an example embodiment, a powershift transmission may include an input shaft, a first counter shaft, a second counter shaft, and an output shaft operably connected to a transmission housing. The powershift transmission may include a plurality of gears and clutches arranged on the shafts resulting in twenty-seven forward modes.

First claim

What is claimed is:

1. A powershift transmission comprising:
a transmission housing;
an input shaft, a first counter shaft, a second counter shaft, and an output shaft rotatably connected to the transmission housing;
a plurality of gears and a plurality of clutches arranged on the shafts resulting in twenty-seven forward modes;
wherein the plurality of gears comprises:
a first gear, a second gear, and a third gear operably connected to the input shaft;
a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, and a ninth gear operably connected to the first counter shaft, the first gear engaged with the fourth gear, the second gear engaged with the sixth gear, the third gear engaged with the eighth gear;
a tenth gear, an eleventh gear, a twelfth gear, a thirteenth gear, a fourteenth gear, and a fifteenth gear operably connected to the second counter shaft, the twelfth gear engaged with the fifth gear, the fourteenth gear engaged with the seventh gear, and the fifteenth gear engaged with the ninth gear; and
a sixteenth gear, a seventeenth gear, and an eighteenth gear operably connected to the output shaft, the sixteenth gear engaged with the tenth gear, the seventeenth gear engaged with the eleventh gear, the eighteenth gear engaged with the thirteenth gear;

wherein:
the number of teeth on the fourth gear divided by the number of teeth on the first gear is within twenty percent of 1.211;
the number of teeth on the eighth gear divided by the number of teeth on the third gear is within twenty percent of 1.054;
the number of teeth on the sixth gear divided by the number of teeth on the second gear is within twenty percent of 0.919;
the number of teeth on the twelfth gear divided by the number of teeth on the fifth gear is within twenty percent of 2.567;
the number of teeth on the fifteenth gear divided by the number of teeth on the ninth gear is within twenty percent of 1.697;
the number of teeth on the fourteenth gear divided by the number of teeth on the seventh gear is within twenty percent of 1.122;
the number of teeth on the seventeenth gear divided by the number of teeth on the eleventh gear is within twenty percent of 3.385;
the number of teeth on the eighteenth gear divided by the number of teeth on the thirteenth gear is within twenty percent of 0.980; and
the number of teeth on the sixteenth gear divided by the number of teeth on the tenth gear is within twenty percent of 0.284.

2. A powershift transmission comprising:
a transmission housing;
an input shaft, a first counter shaft, a second counter shaft, and an output shaft rotatably connected to the transmission housing;
a plurality of gears and a plurality of clutches arranged on the shafts resulting in twenty-seven forward modes;
wherein the plurality of gears comprises:
a first gear, a second gear, and a third gear operably connected to the input shaft;
a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, and a ninth gear operably connected to the first counter shaft, the first gear engaged with the fourth gear, the second gear engaged with the sixth gear, the third gear engaged with the eighth gear;
a tenth gear, an eleventh gear, a twelfth gear, a thirteenth gear, a fourteenth gear, and a fifteenth gear operably connected to the second counter shaft, the twelfth gear engaged with the fifth gear, the fourteenth gear engaged with the seventh gear, and the fifteenth gear engaged with the ninth gear; and
a sixteenth gear, a seventeenth gear, and an eighteenth gear operably connected to the output shaft, the sixteenth gear engaged with the tenth gear, the seventeenth gear engaged with the eleventh gear, the eighteenth gear engaged with the thirteenth gear;

wherein the plurality of clutches comprises:
a low clutch selectively engageable, such that engagement of the low clutch causes the first counter shaft to rotate relative to the input shaft based upon the engagement between the first gear and the fourth gear;
a mid clutch selectively engageable, such that engagement of the mid clutch causes the first counter shaft to rotate relative to the input shaft based upon the engagement between the third gear and the eighth gear;
a high clutch selectively engageable, such that engagement of the high clutch causes the first counter shaft to rotate relative to the input shaft based upon the engagement between the second gear and the sixth gear;
a first speed clutch selectively engageable, such that engagement of the first speed clutch causes the second counter shaft to rotate relative to the first counter shaft based upon the engagement between the fifth gear and the twelfth gear;
a second speed clutch selectively engageable, such that engagement of the second speed clutch causes the second counter shaft to rotate relative to the first counter shaft based upon the engagement between the ninth gear and the fifteenth gear;
a third speed clutch selectively engageable, such that engagement of the third speed clutch causes the second counter shaft to rotate relative to the first counter shaft based upon the engagement between the seventh gear and the fourteenth gear;
a first range clutch selectively engageable, such that engagement of the first range clutch causes the output shaft to rotate relative to the second counter shaft based upon the engagement between the eleventh gear and the seventeenth gear;
a second range clutch selectively engageable, such that engagement of the second range clutch causes the output shaft to rotate relative to the second counter shaft based upon the engagement between the thirteenth gear and the eighteen gear; and
a third range clutch selectively engageable, such that engagement of the third range clutch causes the output shaft to rotate relative to the second counter shaft based upon the engagement between the tenth gear and the sixteen gear;

wherein each forward mode includes the engagement of one of the low clutch, mid clutch, or high clutch; one of the first speed clutch, second speed clutch, or third speed clutch; and one of the first range clutch, second range clutch, or third range clutch.

3. A powershift transmission comprising:
a transmission housing;
an input shaft, a first counter shaft, a second counter shaft, and an output shaft rotatably connected to the transmission housing;
a plurality of gears and a plurality of clutches arranged on the shafts resulting in twenty-seven forward modes;
wherein the plurality of gears comprises:
a first gear, a second gear, and a third gear operably connected to the input shaft;
a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, and a ninth gear operably connected to the first counter shaft, the first gear engaged with the fourth gear, the second gear engaged with the sixth gear, the third gear engaged with the eighth gear;
a tenth gear, an eleventh gear, a twelfth gear, a thirteenth gear, a fourteenth gear, and a fifteenth gear operably connected to the second counter shaft, the twelfth gear engaged with the fifth gear, the fourteenth gear engaged with the seventh gear, and the fifteenth gear engaged with the ninth gear; and
a sixteenth gear, a seventeenth gear, and an eighteenth gear operably connected to the output shaft, the sixteenth gear engaged with the tenth gear, the seventeenth gear engaged with the eleventh gear, the eighteenth gear engaged with the thirteenth gear;

wherein the plurality of clutches comprises:
a low clutch selectively engageable, such that engagement of the low clutch causes the first counter shaft to rotate relative to the input shaft based upon the engagement between the first gear and the fourth gear;
a mid clutch selectively engageable, such that engagement of the mid clutch causes the first counter shaft to rotate relative to the input shaft based upon the engagement between the thir

Assignees

• Deere & Co

Inventors

• Vu Thomas H

Classifications

• F16H2200/0078

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

• F16H3/093 Primary

  with two or more countershafts · CPC title

• F16H2003/0822

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