Work vehicle

Patent metadata

Field	Value
Publication number	US-12434549-B2
Application number	US-202218081739-A
Country	US
Kind code	B2
Filing date	Dec 15, 2022
Priority date	Mar 11, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A hybrid transmission includes an electric transmission and a gear transmission. The electric transmission includes a first motor generator and a second motor generator. The second motor generator is on a side of the first motor generator on which side the gear transmission is located. An output transmission to transmit the output from the second motor generator to the gear transmission is on the side of the second motor generator on which side the gear transmission is located.

First claim

What is claimed is:

1. A work vehicle, comprising:
an engine;
a hybrid transmission including:
an electric transmission; and
a gear transmission;

the electric transmission and the gear transmission being positioned along a vehicle-body front-rear direction, the gear transmission including a gear driver, the hybrid transmission being operable to vary power from the engine and output the power to a travel device;
a transmission case in which the hybrid transmission is accommodated, the transmission case being provided in a vehicle body in a state where the transmission case is side by side with the engine along the vehicle-body front-rear direction; and
an input transmission; wherein
the electric transmission includes a first motor generator and a second motor generator and is on a side of the gear transmission on which side the engine is located;
the first motor generator is on a side of the second motor generator on which side the engine is located;
the second motor generator is on a side of the first motor generator on which side the gear transmission is located;
the work vehicle further comprises, on a side of the second motor generator on which side the gear transmission is located, an output transmission connecting the second motor generator to an input of the gear transmission to transmit an output from the second motor generator to the input;
the input transmission connects an input shaft of the transmission case to the first motor generator to input power from the input shaft into the first motor generator; and
the input transmission is on a side of the first motor generator on which side the engine is located.

2. The work vehicle according to claim 1 , wherein the input transmission is operable to increase the power from the input shaft and transmit the power to the first motor generator.

3. The work vehicle according to claim 1 , wherein the first motor generator and the second motor generator are rotatable coaxially with the input shaft.

4. The work vehicle according to claim 1 , wherein
the engine is provided in a front portion of the vehicle body; and
the transmission case is behind the engine.

5. A work vehicle, comprising:
an engine;
a hybrid transmission including:
an electric transmission; and
a gear transmission;

the electric transmission and the gear transmission being positioned along a vehicle-body front-rear direction, the gear transmission including a gear driver, the hybrid transmission being operable to vary power from the engine and output the power to a travel device; and
a transmission case in which the hybrid transmission is accommodated, the transmission case being provided in a vehicle body in a state where the transmission case is side by side with the engine along the vehicle-body front-rear direction; wherein
the electric transmission includes a first motor generator and a second motor generator and is provided between the engine and the gear transmission;
the first motor generator and the second motor generator are provided in a state where a first rotation axis of the first motor generator and a second rotation axis of the second motor generator extend along the vehicle-body front-rear direction;
the first rotation axis and the second rotation axis are parallel to each other;
the transmission case includes an input shaft extending in the vehicle-body front-rear direction between the first motor generator and the second motor generator; and
the input shaft extends along the vehicle-body front-rear direction above the first rotation axis and the second rotation axis.

6. The work vehicle according to claim 5 , wherein
the first rotation axis and the second rotation axis extend in a direction along a vehicle-body width direction in a state where the first rotation axis and the second rotation axis are parallel to each other.

7. The work vehicle according to claim 6 , wherein
the input shaft extends along the vehicle-body front-rear direction above the first rotation axis and the second rotation axis; and
the input shaft includes an upper end above an upper end of the first motor generator and above an upper end of the second motor generator.

8. The work vehicle according to claim 5 , wherein the first motor generator and the second motor generator have different outside diameters.

9. The work vehicle according to claim 5 , wherein
the gear transmission includes:
a low-speed planetary transmission to combine engine power from the input shaft with motor power from the second motor generator into low-speed-side combined power and output the low-speed-side combined power; and
a high-speed planetary transmission to combine the engine power from the input shaft with the motor power from the second motor generator into high-speed-side combined power higher than the low-speed-side combined power and output the high-speed-side combined power;

a first one of the low-speed planetary transmission and the high-speed planetary transmission has a rotation axis coinciding with the first rotation axis of the first motor generator; and
a second one of the low-speed planetary transmission and the high-speed planetary transmission has a rotation axis coinciding with the second rotation axis of the second motor generator.

10. The work vehicle according to claim 5 , wherein
the engine is in a front portion of the vehicle body; and
the transmission case is behind the engine.

Assignees

• Kubota Kk

Inventors

• Hirase Yuji
• Yagyu Sumio
• Okazaki Kazuto
• Ii Tsunehiro

Classifications

• F16H2057/02056

  for utility vehicles, e.g. tractors or agricultural machines · CPC title

• F16H2057/02034

  Gearboxes combined or connected with electric machines · CPC title

• F16H57/021

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title

• B60Y2200/92

  Hybrid vehicles · CPC title

• B60K6/547

  the transmission being a stepped gearing · CPC title