Electric work machine

Patent metadata

Field	Value
Publication number	US-9313948-B2
Application number	US-201114123422-A
Country	US
Kind code	B2
Filing date	Nov 30, 2011
Priority date	Jun 22, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A battery car 25 which supplies electrical power to a running motor 16 and a mower motor 15 is included, wheels 34, 38 for facilitating the movement is attached to the battery car 25 , and the battery car 25 is connected to a rear portion of a chassis 11 in a freely attachable and detachable manner. Moreover, a bracket 50 for connecting the battery car 25 is included in the rear portion of the chassis 11 , and a locking shaft 74 to be connected to the bracket 50 is included in the battery car 25.

First claim

The invention claimed is:

1. An electric work machine comprising:
a working unit;
a working unit motor configured to drive the working unit;
running wheels;
a running motor configured to rotate the running wheels; and
a battery case equipped with a battery that supplies electric power to the working unit motor and the running motor,
wheels for facilitating movement being attached to the battery case, and the battery case being connected to a rear portion of a vehicle body frame of the electric work machine in a freely attachable and detachable manner,
wherein a body-side connecting portion for connecting the battery case is included in the rear portion of the vehicle body frame, and
a battery-side connecting portion to be connected to the body-side connecting portion is included in the battery case,
rotating units are included on both side surfaces of the battery case, respectively,
a gripping portion is attached to the rotating unit, and the battery-side connecting portion is included at a position that is eccentric from a rotating point of the rotating unit,
an abutting portion for keeping the battery case in the rear portion of the vehicle body frame is included,
the battery-side connecting portion is rotatably connected to the body-side connecting portion, and
by rotating the rotating unit by the gripping portion, the battery case is rotated using the body-side connecting portion as the rotating point and is kept on the vehicle body frame by coming into contact with the abutting portion.

2. The electric work machine according to claim 1 ,
wherein the working unit is a mower blade,
the working unit motor is a mower motor, and
the mower blade is rotated by the mower motor to mow grass.

3. The electric work machine according to claim 1 , further comprising:
a locking mechanism that locks the rotation of the rotating unit of the battery case.

4. The electric work machine according to claim 1 ,
wherein the abutting portion includes a body-side fixing portion, and the battery case includes a battery-side fixing portion, and
the battery case is fixed to the abutting portion by connecting the body-side fixing portion and the battery-side fixing portion to each other.

5. The electric work machine according to claim 1 ,
wherein a buffer portion for reducing impact when bringing the battery case into contact with the abutting portion is included in the rear portion of the vehicle body frame.

6. The electric work machine according to claim 1 ,
wherein an abut promoting portion for making it easier to keep the battery case in the abutting portion is included in the rear portion of the vehicle body frame.

7. The electric work machine according to claim 1 ,
wherein the abutting portion is provided so as to be inclined in a forward direction,
the wheels provided in the battery case include a pair of front wheels and a pair of rear wheels,
a rear wheel bracket configured to rotatably support the rear wheels and a rear wheel support portion configured to turnably support the rear wheel bracket are attached to the battery case, and
a rotation center of the rear wheels is provided so as to deviate with respect to a turning center line of the rear wheel bracket.

8. The electric work machine according to claim 1 ,
wherein a cover is provided on an upper portion of the battery case,
the cover is freely opened and closed with respect to the battery case,
a charging port for charging the battery is included in the cover, and
the charging port is exposed by opening the cover.

9. The electric work machine according to claim 7 ,
wherein the running wheels are a pair of rear wheels,
the pair of rear wheels is included on both outer sides of the rear portion of the vehicle body frame,
the electric work machine is able to perform zero-turn,
when the battery case is mounted, the rotation center of the rear wheels of the battery case is located in front of the turning center line of the rear wheel bracket, and
the rear wheels of the battery case are arranged within a turning circle during the zero-turn.

10. The electric work machine according to claim 1 ,
wherein the battery case includes an upper chamber and a lower chamber,
the battery is housed in the lower chamber, and
a control unit configured to control an output voltage and an output current of the battery is housed in the upper chamber.

11. The electric work machine according to claim 10 ,
wherein the upper chamber is set to be able to rotate with respect to the lower chamber, and a bottom surface of the upper chamber also serves as an upper surface of the lower chamber, and
the battery is set to be able to be taken out upward by opening the upper surface of the lower chamber.

12. The electric work machine according to claim 11 ,
wherein the upper chamber is set to be freely rotated with respect to the lower chamber, and the battery case includes a locking mechanism for restricting the rotation.

13. The electric work machine according to claim 10 ,
wherein a side surface of the lower chamber is set to be able to be opened, and the battery is housed or taken out of the openable side surface.

14. The electric work machine according to claim 10 , further comprising:
an AC-DC converter for converting electric power of the battery into an alternating current, and
an outlet for using the AC power converted by the AC-DC converter,
wherein the outlet is provided on the surface of the battery case.

15. The electric work machine according to claim 10 , further comprising:
a measurement unit configured to measure a voltage and a current of the battery, and
a display unit for displaying the measured voltage value and current value,
wherein the display unit is included on the surface of the battery case.

Assignees

• Moriguchi Kazuma
• Ebihara Tomoyuki
• Yanmar Co Ltd

Inventors

• Moriguchi Kazuma
• Ebihara Tomoyuki

Classifications

• A01D34/78 Primary

  electric · CPC title

• A01D34/006

  Control or measuring arrangements · CPC title

• B60K1/04

  of the electric storage means for propulsion · CPC title

• B60L53/80

  Exchanging energy storage elements, e.g. removable batteries · CPC title

• B60K2001/0416

  Arrangement in the rear part of the vehicle · CPC title