Working device and working machine having the same

Patent metadata

Field	Value
Publication number	US-11214152-B2
Application number	US-202016910644-A
Country	US
Kind code	B2
Filing date	Jun 24, 2020
Priority date	Apr 27, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A working device connected to a traveling vehicle having a prime mover and configured to perform an agricultural work, includes: a working portion to perform an agricultural work; an electric motor to be driven by electric power; a power transmission mechanism to which power generated by the electric motor is inputted, configured to transmit the power to the working portion; a regeneration resistor to consume a regenerative power generated in the electric motor; a switch portion to switch, between a connecting state and a shut-off state, a state established between the electric motor and the regeneration resistor; and a controller portion to control driving of the electric motor and switching of the switch portion.

First claim

What is claimed is:

1. A working device connected to a traveling vehicle having a prime mover and configured to perform an agricultural work, comprising:
a working portion to perform an agricultural work;
at least one electric motor to be driven by electric power;
a power transmission mechanism to which power generated by the at least one electric motor is inputted, the power transmission mechanism being configured to transmit the power to the working portion;
a regeneration resistor to consume a regenerative power generated in the at least one electric motor;
a switch portion to switch, between a connecting state and a shut-off state, a state established between the at least one electric motor and the regeneration resistor; and
a controller portion to control driving of the at least one electric motor and switching of the switch portion.

2. The working device according to claim 1 ,
wherein the at least one electric motor is driven by electric power supplied from the traveling vehicle, and
wherein power generated by the at least one electric motor and power supplied from the prime mover are inputted to the power transmission mechanism.

3. The working device according to claim 1 ,
wherein the controller portion
switches the switch portion to be in the connecting state when the regenerative power is generated, and
switches the switch portion to be in the shut-off state when generation of the regenerative power stops.

4. The working device according to claim 1 ,
wherein the at least one electric motor includes a plurality of electric motors, and
wherein the controller portion switches the switch portion to be in the connecting state when at least one of the electric motors generates regenerative power.

5. The working device according to claim 1 ,
wherein the at least one electric motor includes a plurality of electric motors, and
wherein the controller portion switches the switch portion to be in the connecting state when all of the electric motors generate regenerative power.

6. The working device according to claim 1 ,
wherein the at least one electric motor includes a plurality of electric motors, and
wherein the controller portion switches the switch portion to be in the connecting state
when all of the electric motors generate regenerative power or
when one of the electric motors generates regenerative power and the others of the electric motors generate powering power and the regenerative power generated by the at least one of the electric motors is larger than the powering power generated by each of the others of the electric motors.

7. The working device according to claim 1 ,
wherein the at least one electric motor includes a plurality of electric motors, and
wherein the controller portion switches the switch portion to be in the connecting state in transmitting a signal that orders at least one of the electric motors to reversely revolve.

8. The working device according to claim 1 ,
wherein the prime mover is an engine, and
wherein the power transmission mechanism has:
a planetary gear mechanism having:
a first inputting portion to which power from the engine is inputted through a PTO shaft; and
a second inputting portion to which power generated by the at least one electric motor is inputted; and

an outputting portion to output the power from the planetary gear mechanism to the working portion.

9. The working device according to claim 1 ,
wherein power of the prime mover is inputted to the power transmission mechanism through a PTO shaft, and
wherein the controller portion calculates a revolving speed of the rotor based on a revolving speed of the at least one electric motor and a revolving speed of the PTO shaft.

10. The working device according to claim 9 , comprising:
an inverter to control driving of the at least one electric motor;
a power supply circuit connected to the inverter and configured to supply electric power to the at least one electric motor through the inverter; and
a detector to detect a revolving speed of the at least one electric motor,
wherein the controller portion calculates a revolving speed of the rotor based on an ordered revolving speed transmitted from the controller portion to the inverter to control the revolving speed of the at least one electric motor and on a received revolving speed detected by the detector and transmitted from the inverter.

11. The working device according to claim 10 ,
wherein the controller portion calculates the revolving speed of the rotor as a value between the ordered revolving speed and the received revolving speed.

12. The working device according to claim 1 , comprising:
an inverter to control driving of the at least one electric motor; and
a power supply circuit connected to the inverter and configured to supply electric power to the at least one electric motor through the inverter,
wherein the inverter includes
a protection device to stop an output when a load voltage exceeds a predetermined voltage, and

wherein the controller portion switches the switch portion when a voltage of the power supply circuit exceeds a threshold voltage set between the predetermined voltage and a rated voltage of the power supply circuit.

13. A working machine, comprising:
a traveling vehicle having a prime mover; and
the working device according to claim 12 connected to the traveling vehicle.

14. A working machine comprising:
a traveling vehicle having a prime mover; and
a working device connected to the traveling vehicle and configured to perform an agricultural work,
wherein the working device includes:
a working portion to perform the agricultural work;
an electric motor to be driven by electric power;
a power transmission mechanism to which power generated by the electric motor is inputted, the power transmission mechanism being configured to transmit the power to the working portion;

a regeneration resistor to consume a regenerative power generated in the electric motor; and
a switch portion to switch, between a connecting state and a shut-off state, a state established between the electric motor and the regeneration resistor, and
wherein the traveling vehicle or the working device has
a controller portion to control driving of the electric motor and switching of the switch portion.

15. A working device connected to a traveling vehicle having a prime mover and configured to perform an agricultural work, comprising:
a working portion to perform an agricultural work, using revolving of a rotor;
at least one electric motor to be driven by electric power;
a power transmission mechanism to which power generated by the at least one electric motor is inputted, the power transmission mechanism being configured to transmit the power to the working portion;
a regeneration resistor to consume a regenerative power generated in the at least one electric motor;
a switch portion to switch, between a connecting state and a shut-off state, a state established between the at least one electric motor and the regeneration resistor; and
a controller portion to control switching of the switch portion,
wherein the controller portion sets the switch portion to be in the shut-off state when an actual required power of the at least one electric motor is a positive value larger than 0 W and is equal to or more than a first threshold value determined based on a fluctuation width of the actual required power determined by a revolving speed of the rotor.

16. The working device according to claim 15 ,
wherein the controller portion sets the first threshold value bas

Assignees

• Kubota Kk

Inventors

• Yamanaka Yukifumi
• Yagyu Sumio
• Takaki Go

Classifications

• A01C19/02

  by a motor · CPC title

• B60K25/06

  from the transmission power take-off · CPC title

• A01C17/005 Primary

  Driving mechanisms for the throwing devices · CPC title

• A01B71/06

  Special adaptations of coupling means between power take-off and transmission shaft to the implement or machine · CPC title

• B60Y2300/1886

  Controlling power supply to auxiliary devices · CPC title