US 12,151,584 B2
Working vehicle
Kazuto Okazaki, Osaka (JP); Shinichi Kawabata, Osaka (JP); and Hiroshi Shimada, Osaka (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on May 12, 2022, as Appl. No. 17/742,709.
Claims priority of application No. 2021-083295 (JP), filed on May 17, 2021.
Prior Publication US 2022/0363160 A1, Nov. 17, 2022
Int. Cl. B60L 53/80 (2019.01); B60L 50/60 (2019.01)
CPC B60L 53/80 (2019.02) [B60L 50/66 (2019.02)] 10 Claims
OG exemplary drawing
 
1. A working vehicle comprising:
a vehicle body;
a traveling device which supports the vehicle body such that the vehicle body is allowed to travel;
an electric motor to drive the traveling device, the electric motor being provided on the vehicle body; and
a plurality of batteries to store electric power to be supplied to the electric motor, wherein
the plurality of batteries include an on-board battery fixed to the vehicle body and a mobile battery detachably attached to the vehicle body;
the working vehicle further comprises a switching mechanism configured to be selectively placed in a first state in which electric power is supplied from the on-board battery to the electric motor or a second state in which electric power is supplied from the mobile battery to the electric motor;
the switching mechanism includes
a first output cable electrically connected to the on-board battery,
a second output cable configured to be electrically connected to the mobile battery,
a supply cable electrically connected to the electric motor, and
a relay configured to be selectively placed in a first connection state in which the relay electrically connects the first output cable and the supply cable to each other or a second connection state in which the relay electrically connects the second output cable and the supply cable to each other;
a plurality of the mobile batteries are detachably attached to the vehicle body;
the plurality of mobile batteries include a first mobile battery and a second mobile battery;
the switching mechanism includes a plurality of the second output cables including a first cable configured to be electrically connected to the first mobile battery and a second cable configured to be electrically connected to the second mobile battery;
the relay is configured to be selectively placed in a first form of the second connection state in which the relay electrically connects the first cable and the supply cable to each other or a second form of the second connection state in which the relay electrically connects the second cable and the supply cable to each other;
the first mobile battery is detachably attached closer to the on-board battery than the second mobile battery is to the on-board battery; and
the relay is placed in the first form of the second connection state when battery power remaining in the first mobile battery is equal to or greater than a predetermined level, and is placed in the second form of the second connection state when the battery power remaining in the first mobile battery is less than the predetermined level.