Work vehicle

Patent metadata

Field	Value
Publication number	US-12502947-B2
Application number	US-202318131017-A
Country	US
Kind code	B2
Filing date	Apr 5, 2023
Priority date	Jun 3, 2022
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

A work vehicle includes: a travel device; a battery; a motor configured to supply motive power to the travel device; an inverter configured to enable the motor to operate; a first storage section configured to store a first coolant; and a second storage section configured to store a second coolant. The first coolant in the first storage section is supplied to the motor by the first pump, and returns from the motor to the first storage section, and the second coolant in the second storage section is supplied to the inverter by the second pump, and returns from the inverter to the second storage section.

First claim

What is claimed is:

1 . A work vehicle comprising:
a travel device; a battery; a motor configured to supply motive power to the travel device; an inverter configured to enable the motor to operate; a first storage section configured to store a first coolant; and a second storage section configured to store a second coolant, wherein the first coolant in the first storage section is supplied to the motor by a first pump, and returns from the motor to the first storage section, the second coolant in the second storage section is supplied to the inverter by a second pump, and returns from the inverter to the second storage section, and the first coolant is supplied from an injection nozzle to various portions of the motor and naturally falls from the motor to return to the first storage section.

2 . The work vehicle according to claim 1 , wherein
the first coolant is cooling oil, and the second coolant is cooling water.

3 . The work vehicle according to claim 2 , further comprising:
a cooling section configured to cool the cooling oil in a first supply system in which the cooling oil in the first storage section is supplied from the first pump to the motor; and a radiator configured to cool the cooling water in a second supply system in which the cooling water in the second storage section is supplied from the second pump to the inverter.

4 . The work vehicle according to claim 3 , wherein
the cooling section includes a heat exchanger extending across the first supply system and the second supply system, and the heat exchanger is configured to perform heat exchange between the cooling oil and the cooling water.

5 . The work vehicle according to claim 3 , wherein
the cooling section includes an oil cooler configured to cool the cooling oil.

6 . The work vehicle according to claim 5 , further comprising:
an electric transmission section housing the motor, wherein the first storage section is the electric transmission section, and the cooling oil is lubricating oil stored in the electric transmission section.

7 . The work vehicle according to claim 6 , wherein
the motor is a motor generator, and the work vehicle further comprises:
an engine separate from the motor generator; and
a hybrid transmission that includes the electric transmission section and a gear transmission section provided with a gear transmission mechanism, and is configured to change a speed of motive power from the engine and output the motive power to the travel device.

8 . The work vehicle according to claim 7 , wherein
the electric transmission section and the gear transmission section are partitioned from each other, and the lubricating oil stored in the electric transmission section is different from lubricating oil stored in the gear transmission section.

Assignees

• Kubota Kk

Inventors

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

Classifications

• B60Y2200/221

  Tractors · CPC title

• B60K6/40

  characterised by the assembly or relative disposition of components · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title