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CN-121989587-A - Electric speed change drive axle assembly of working vehicle

CN121989587ACN 121989587 ACN121989587 ACN 121989587ACN-121989587-A

Abstract

An electrically variable transaxle for a work vehicle is disclosed. The electric transaxle includes a transaxle housing and a motor. The electrically-variable transaxle also includes a multi-speed powershift transmission driven by the motor and including a first gear set having a first powershift clutch for providing a first speed ratio and a second gear set having a second powershift clutch for providing a second speed ratio different from the first speed ratio. The electrically variable drive axle further includes a cooling system including a cooler that cools a cooling circuit configured to cool the electric machine. The electrically-variable transaxle further includes a hydraulic system including a hydraulic pump and a hydraulic circuit mounted to or at least partially housed within the transaxle housing for operating the first and second powershift clutches, the hydraulic circuit being cooled by a cooler of the cooling system.

Inventors

  • RANDALL L. LONG
  • So Rob Kurakh
  • Anup N. Yadijil

Assignees

  • 迪尔公司

Dates

Publication Date
20260508
Application Date
20250820
Priority Date
20241106

Claims (10)

  1. 1. An electrically variable transaxle (150) for a work vehicle (100), comprising: a transaxle housing (160); -an electric motor (152) mounted to the transaxle housing (160) or at least partially housed within the transaxle housing (160); A multi-speed powershift transmission (154) driven by the electric motor (152) and including a first gear set (230) having a first powershift clutch (170) for providing a first speed ratio and a second gear set (232) having a second powershift clutch (174) for providing a second speed ratio different from the first speed ratio; A cooling system including a cooler (176) that cools a cooling circuit that is mounted to or at least partially housed within the transaxle housing (160) and that is configured to cool the electric machine (152), and A hydraulic system including a hydraulic pump (164) and a hydraulic circuit mounted to or at least partially housed within the transaxle housing (160) for operating the first power shift clutch (170) of the first gear set (230) and the second power shift clutch (174) of the second gear set (232), the hydraulic circuit being cooled by the cooler (176) of the cooling system.
  2. 2. The electrically-variable transaxle (150) of claim 1 wherein the first gear set (230) is identical to the second gear set (232) and the first gear set (230) and the second gear set (232) are arranged in opposite axial orientations.
  3. 3. The electrically variable drive axle (150) of claim 2, wherein said first gear set (230) includes a first shaft (210) extending along a first rotational axis (206) and carrying a first bull gear (234) spaced apart from a first pinion gear (236) along said first rotational axis (206); Wherein the second gear set (232) comprises a second shaft (244) extending along a second rotational axis (246) parallel to the first rotational axis (206) and carrying a second gearwheel (248) spaced apart from a second pinion (250) along the second rotational axis (246), the second gearwheel (248) being identical to the first gearwheel (234), the second pinion (250) being identical to the first pinion (236), and Wherein the first pinion (236) meshes with the second bull gear (248) to provide the first speed ratio, and wherein the first bull gear (234) meshes with the second pinion (250) to provide the second speed ratio.
  4. 4. The electrically-variable transaxle (150) of claim 3 wherein the multi-speed power-shift transmission (154) is powered at the first speed ratio when the first power-shift clutch (170) is engaged and the second power-shift clutch (174) is disengaged, and Wherein the multi-speed powershift transmission (154) is powered at the second speed ratio when the second powershift clutch (174) is engaged and the first powershift clutch (170) is disengaged.
  5. 5. The electrically-variable transaxle (150) of claim 4, further comprising an output gear (284) connected to the second shaft (244) of the second gear set (232) or being part of the second shaft (244) of the second gear set (232) and outputting power at the first speed ratio when the first powershift clutch (170) is engaged and the second powershift clutch (174) is disengaged, and outputting power at the second speed ratio when the second powershift clutch (174) is engaged and the first powershift clutch (170) is disengaged.
  6. 6. The electrically variable drive (150) of claim 5, wherein said output gear (284) is a helical bevel gear meshed with a face (382) of a drive gear (380) of said transaxle.
  7. 7. The electrically-variable transaxle (150) of claim 6 further comprising a differential (224) mounted to the transaxle housing (160) or at least partially housed within the transaxle housing (160) and receiving power from the drive gear (380).
  8. 8. The electrically variable transaxle (150) of claim 7 further comprising: A first final drive (351) mounted to or at least partially housed within the transaxle housing (160) on a first side of the differential (224) and providing a final gear ratio to a first hub (198) configured to mount a first ground engaging wheel (104) or track, an A second final drive (351) mounted to or at least partially housed within the transaxle housing (160) on a second side of the differential (224), and providing the final gear ratio to a second hub (198) configured to mount a second ground engaging wheel (104) or track.
  9. 9. The electrically variable transaxle (150) of claim 3 further comprising one or more of the following: a first power take-off assembly (418) mounted to the transaxle housing (160) or at least partially housed within the transaxle housing (160) and configured to receive power from or transmit power to the multi-speed powershift transmission (154) at the first speed ratio or the second speed ratio, or A second power output assembly (420) mounted to or at least partially housed within the transaxle housing (160) and configured to receive power from or transmit power to the multi-speed powershift transmission (154) at the first speed ratio or the second speed ratio.
  10. 10. The electrically variable axle (150) of claim 9, wherein said first power take-off assembly (418) is part of a continuous four-wheel drive assembly, and wherein said second power take-off assembly (420) is part of a mechanical transient four-wheel drive assembly.

Description

Electric speed change drive axle assembly of working vehicle Technical Field The present disclosure relates generally to an electrically variable drive axle for a work vehicle. Background Heavy work vehicles, such as those used in agriculture, construction, forestry, and mining industries, may have a transmission system with high-speed gearing and low-speed gearing that are selected based on the operation being performed by the work vehicle. The gear train may be driven by a battery-powered motor. A shift between the high-speed gear transmission and the low-speed gear transmission may be performed using the clutch. The motor and transmission may be lubricated with hydraulic fluid. Disclosure of Invention An electrically variable drive axle includes a transaxle housing and an electric motor mounted to or at least partially housed within the transaxle housing. The electrically-variable transaxle further includes a multi-speed powershift transmission driven by the electric motor and including a first gear set having a first powershift clutch for providing a first speed ratio and a second gear set having a second powershift clutch for providing a second speed ratio different from the first speed ratio. The electric transaxle further includes a cooling system including a cooler that cools a cooling circuit that is mounted to or at least partially housed within the transaxle housing and configured to cool the electric machine. The electrically variable axle further includes a hydraulic system including a hydraulic pump and a hydraulic circuit mounted to or at least partially housed within the transaxle housing for operating the first powershift clutch of the first gear set and the second powershift clutch of the second gear set, the hydraulic circuit being cooled by the cooler of the cooling system. In one example of the electrically variable drive axle, the first gear set is identical to the second gear set, and the first gear set and the second gear set are arranged in opposite axial orientations. In another example of the electrically variable drive axle, the first gear set is identical to the second gear set, and the first gear set and the second gear set are arranged in opposite axial orientations. In another example of the electrically-variable drive axle, the first gear set includes a first shaft extending along a first rotational axis and carrying a first large gear spaced apart from a first small gear along the first rotational axis, and the second gear set includes a second shaft extending along a second rotational axis parallel to the first rotational axis and carrying a second large gear spaced apart from a second small gear along the second rotational axis, the second large gear being identical to the first large gear and the second small gear being identical to the first small gear. The first pinion gear meshes with the second bull gear to provide the first speed ratio, and wherein the first bull gear meshes with the second pinion gear to provide the second speed ratio. In another example of the electrically-variable transaxle, the multi-speed powershift transmission is powered at the first speed ratio when the first powershift clutch is engaged and the second powershift clutch is disengaged, and wherein the multi-speed powershift transmission is powered at the second speed ratio when the second powershift clutch is engaged and the first powershift clutch is disengaged. In another example of the electrically-variable drive axle, the electrically-variable drive axle further includes an output gear connected to or part of the second shaft of the second gear set. The output gear outputs power at the first speed ratio when the first power shift clutch is engaged and the second power shift clutch is disengaged, and outputs power at the second speed ratio when the second power shift clutch is engaged and the first power shift clutch is disengaged. In another example of the electrically variable drive axle, the output gear is a helical bevel gear that meshes with a face of a drive gear of the variable drive axle. In another example of the electrically-variable drive axle, the electrically-variable drive axle further includes a differential mounted to or at least partially housed within the transaxle housing, and the differential receives power from the drive gear. In another example of the electrically-variable axle, the electrically-variable axle further includes a first final drive mounted to or at least partially housed within the transaxle housing on a first side of the differential and providing a final gear ratio to a first hub configured to mount a first ground-engaging wheel or track, and a second final drive mounted to or at least partially housed within the transaxle housing on a second side of the differential and providing the final gear ratio to a second hub configured to mount a second ground-engaging wheel or track. In another example of the electrically-variable drive axle, the electrically