Swiveling working machine

Patent metadata

Field	Value
Publication number	US-12345014-B2
Application number	US-202217744926-A
Country	US
Kind code	B2
Filing date	May 16, 2022
Priority date	Nov 18, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

A swiveling working machine includes a swivel base; a working device provided on a front side of the swivel base; a battery unit; an electric motor that is driven by electric power output by the battery unit; and a hydraulic pump that delivers a hydraulic fluid by driving of the electric motor. The battery unit is disposed at a rear portion of the swivel base. The electric motor and the hydraulic pump are disposed sideward of the battery unit side by side in a front-rear direction.

First claim

What is claimed is:

1. A swiveling working machine comprising:
a swivel base;
a working device provided on a front side of the swivel base;
a battery unit;
an electric motor that is driven by electric power output by the battery unit; and
a hydraulic pump that delivers a hydraulic fluid by driving of the electric motor,
wherein the battery unit is disposed at a rear portion of the swivel base, and
wherein the electric motor and the hydraulic pump are disposed sideward of the battery unit side by side in a front-rear direction.

2. The swiveling working machine according to claim 1 ,
wherein the swivel base is rotatable around a swiveling axis extending in an up-down direction, and
wherein the battery unit, the electric motor, and the hydraulic pump are disposed rearward of the swiveling axis.

3. The swiveling working machine according to claim 2 , comprising:
a lower traveling body that supports the swivel base rotatably around the swiveling axis and that is capable of traveling,
wherein a rear portion of the battery unit is positioned rearward of a rear end portion of the lower traveling body.

4. The swiveling working machine according to claim 1 , comprising:
a cooling mechanism that is disposed sideward of the battery unit and above the hydraulic pump and the electric motor and that cools the hydraulic fluid and the electric motor.

5. The swiveling working machine according to claim 4 , comprising:
a cover that covers the battery unit, the electric motor, and the hydraulic pump,
wherein the cooling mechanism discharges air outwardly in a width direction from a space defined by the cover.

6. The swiveling working machine according to claim 1 , comprising:
a lower traveling body that supports the swivel base rotatably around a swiveling axis and that is capable of traveling;
a cover that covers the battery unit, the electric motor, and the hydraulic pump; and
a support frame that is provided at the swivel base and that supports the cover,
wherein a rear portion of the support frame is positioned rearward of a rear portion of the lower traveling body.

7. The swiveling working machine according to claim 6 , comprising:
a protecting mechanism that is provided on the swivel base and that protects an operator seat,
wherein the protecting mechanism is supported by the support frame.

8. The swiveling working machine according to claim 1 , comprising:
a hydraulic-fluid tank that stores a hydraulic fluid;
hydraulic equipment that is driven by the hydraulic fluid delivered by the hydraulic pump; and
a controlling valve that is mounted on the swivel base and that regulates the hydraulic fluid delivered by the hydraulic pump and controls the hydraulic equipment,
wherein the hydraulic-fluid tank and the controlling valve are disposed forward of the battery unit.

9. The swiveling working machine according to claim 8 , comprising:
a protecting mechanism that is provided on the swivel base and protects an operator seat,
wherein a position of a center of gravity of the battery unit is disposed on one side with respect to a center line of the swivel base in a width direction, the protecting mechanism is disposed on the one side with respect to the center line and forward of the battery unit, and the controlling valve is disposed on the one side with respect to the center line and below the protecting mechanism, and
wherein the electric motor and the hydraulic pump are disposed on another side with respect to the center line and sideward of the battery unit, and the hydraulic-fluid tank is disposed on the other side with respect to the center line and forward of the electric motor and the hydraulic pump.

10. The swiveling working machine according to claim 1 ,
wherein a position of a center of gravity of the battery unit is disposed on one side with respect to a center line of the swivel base in a width direction, and
wherein the working device is disposed on another side with respect to the center line.

11. The swiveling working machine according to claim 1 , comprising:
a radiator fan that cools a radiator; and
a fluid-cooler fan that cools a fluid cooler separately from the radiator fan.

12. The swiveling working machine according to claim 11 , comprising:
a controller that controls driving of the radiator fan and driving of the fluid-cooler fan,
wherein the controller controls each of the radiator fan and the fluid-cooler fan independently.

13. The swiveling working machine according to claim 1 ,
wherein the battery unit includes a plurality of batteries connected in parallel to each other,
wherein the swiveling working machine comprises
a controller that selects, among the plurality of batteries, an output battery that supplies electric power to the electric motor, and
a connection switch unit that switches, for each of the batteries, a power supply path from the battery to the electric motor between a connected state and an interrupted state, and

wherein the controller performs
first processing of causing each of the batteries to be in the interrupted state when selecting the output battery,
second processing of, after the first processing, causing a battery that is to be selected as the output battery to be in the connected state, and
third processing of, after the second processing, causing the battery selected as the output battery to start power supply to the electric motor.

14. An electric working machine comprising:
an electric motor;
a battery unit that supplies electric power to the electric motor;
a hydraulic pump that is driven by the electric motor and delivers a hydraulic fluid;
hydraulic equipment that is driven by the hydraulic fluid; and
a working device that is operated by the hydraulic equipment,
wherein the battery unit includes a plurality of batteries connected in parallel to each other,
wherein the electric working machine comprises
a controller that selects, among the plurality of batteries, an output battery that supplies electric power to the electric motor, and
a connection switch unit that switches, for each of the batteries, a power supply path from the battery to the electric motor between a connected state and an interrupted state, and

wherein the controller performs
first processing of causing each of the batteries to be in the interrupted state when selecting the output battery,
second processing of, after the first processing, causing a battery that is to be selected as the output battery to be in the connected state, and
third processing of, after the second processing, causing the battery selected as the output battery to start power supply to the electric motor.

Assignees

• Kubota Kk

Inventors

• Kunizawa Teruo
• Ito Junki
• Araki Yoshiaki
• TAKAKI Takahiro
• Takaki Go
• Kishimoto Akihiro

Classifications

• H02J7/751

  concerning the insertion or the connection of the batteries · CPC title

• F01P7/02

  the coolant being cooling-air · CPC title

• F01P5/02

  Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers · CPC title

• E02F9/2296

  Systems with a variable displacement pump · CPC title

• E02F9/2292

  Systems with two or more pumps · CPC title