US 12,304,555 B2
Working machine
Yuji Fukuda, Osaka (JP); and Kohei Nagao, Osaka (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Jun. 20, 2024, as Appl. No. 18/748,978.
Application 18/748,978 is a continuation of application No. 17/357,608, filed on Jun. 24, 2021, granted, now 12,065,191.
Claims priority of application No. 2020-137176 (JP), filed on Aug. 15, 2020; application No. 2020-137177 (JP), filed on Aug. 15, 2020; and application No. 2021-051889 (JP), filed on Mar. 25, 2021.
Prior Publication US 2024/0336301 A1, Oct. 10, 2024
Int. Cl. B62D 11/04 (2006.01); E02F 9/22 (2006.01)
CPC B62D 11/04 (2013.01) [E02F 9/2235 (2013.01); E02F 9/2253 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A working machine comprising:
a machine body;
a left traveling device provided on a left portion of the machine body;
a right traveling device provided on a right portion of the machine body;
a left traveling motor to output a power to the left traveling device;
a right traveling motor to output a power to the right traveling device;
a first rotation detector to detect a first rotation speed that is a rotation speed of the left traveling motor;
a second rotation detector to detect a second rotation speed that is a rotation speed of the right traveling motor;
a left traveling pump to supply operation fluid to the left traveling motor;
a right traveling pump to supply operation fluid to the right traveling motor;
a pressure detector configured to detect a pressure of operation fluid supplied to the left traveling motor and to the right traveling motor;
a traveling operation device to operate at least one of the left traveling pump and the right traveling pump; and
a controller to perform, when the first rotation speed and the second rotation speed are set at a second speed stage:
comparison between the pressure of the operation fluid detected by the pressure detector and a predetermined deceleration threshold; and
automatic deceleration to automatically reduce the first rotation speed and the second rotation speed to a first speed stage lower than the second speed stage, based on a result of the comparison, wherein
the controller does not perform the automatic deceleration when a traveling operation member included in the traveling operation device is operated in a direction for forward traveling of the machine body and the left traveling motor and the right traveling motor rotate in respective directions for backward traveling of the machine body.