Transmission system for a work vehicle
AssigneeCNH Industrial America LLC
InventorsAlek Nicholas Czernobil, Richard A. Miller
Life of this patent
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Abstract
A powershift transmission for a work vehicle includes a speed section. Within the speed section, a speed C clutch is engageable to transfer rotational power from a speed input shaft to a speed countershaft via first and second speed gears, a speed A clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via third and fourth speed gears, and a speed B clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via fifth and sixth speed gears. A first gear ratio between the first and second speed gears is greater than a second gear ratio between the third and fourth speed gears and a third gear ratio between the fifth and sixth speed gears.
Claims20
A powershift transmission for a work vehicle, comprising:
- a speed section, comprising:
- a speed input shaft configured to be driven in rotation by an input;
- a speed countershaft;
- a speed A clutch coupled to the speed input shaft;
- a speed B clutch coupled to the speed input shaft;
- a speed C clutch coupled to the speed countershaft;
- a first speed gear coupled to the speed input shaft and configured to rotate with the speed input shaft;
- a second speed gear coupled to the speed C clutch and engaged with the first speed gear;
- a third speed gear coupled to the speed A clutch;
- a fourth speed gear coupled to the speed countershaft and configured to rotate with the speed countershaft, wherein the fourth speed gear is engaged with the third speed gear;
- a fifth speed gear coupled to the speed B clutch;
- and
- a sixth speed gear coupled to the speed countershaft and configured to rotate with the speed countershaft, wherein the sixth speed gear is engaged with the fifth speed gear;
- wherein the speed A clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via the third and fourth speed gears, the speed B clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via the fifth and sixth speed gears, and the speed C clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via the first and second speed gears;
- wherein a first gear ratio between the first and second speed gears is greater than a second gear ratio between the third and fourth speed gears and a third gear ratio between the fifth and sixth speed gears.
A powershift transmission system for a work vehicle, comprising
- a controller comprising a memory and a processor;
- a powershift transmission comprising a speed section, comprising:
- a speed input shaft configured to be driven in rotation by an input;
- a speed countershaft;
- a speed A clutch coupled to the speed input shaft and communicatively coupled to the controller;
- a speed B clutch coupled to the speed input shaft and communicatively coupled to the controller;
- a speed C clutch coupled to the speed countershaft and communicatively coupled to the controller;
- a first speed gear coupled to the speed input shaft and configured to rotate with the speed input shaft;
- a second speed gear coupled to the speed C clutch and engaged with the first speed gear;
- a third speed gear coupled to the speed A clutch;
- a fourth speed gear coupled to the speed countershaft and configured to rotate with the speed countershaft, wherein the fourth speed gear is engaged with the third speed gear;
- a fifth speed gear coupled to the speed B clutch;
- and
- a sixth speed gear coupled to the speed countershaft and configured to rotate with the speed countershaft, wherein the sixth speed gear is engaged with the fifth speed gear;
- wherein the speed A clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via the third and fourth speed gears, the speed B clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via the fifth and sixth speed gears, and the speed C clutch is engageable to transfer rotational power from the speed input shaft to the speed countershaft via the first and second speed gears;
- wherein the controller is configured to output one or more signals indicative of instructions to engage the speed C clutch, to disengage the speed A clutch, and to disengage the speed B clutch to establish a highest gear ratio of the powershift transmission.
A powershift transmission for a work vehicle, comprising
- a range section, comprising:
- a range input shaft;
- a range countershaft;
- three range clutches and six range gears configured to control a power flow path between the range input shaft and the range countershaft;
- a seventh range gear coupled to the range countershaft and configured to rotate with the range countershaft;
- and
- an eighth range gear engaged with the seventh range gear, wherein the eighth range gear is configured to couple to a rear axle input shaft;
- wherein a first gear ratio between the seventh range gear and the eighth range gear is less than 1.900.
Dependencies are inferred from the claim text.