US 12,352,012 B2
Working machine
Daiki Abe, Osaka (JP); Yuya Tanabe, Osaka (JP); Hiroaki Nakagawa, Osaka (JP); and Ryota Hamamoto, Osaka (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Aug. 6, 2021, as Appl. No. 17/396,195.
Claims priority of application No. 2020-137184 (JP), filed on Aug. 15, 2020; application No. 2020-137185 (JP), filed on Aug. 15, 2020; and application No. 2020-137186 (JP), filed on Aug. 15, 2020.
Prior Publication US 2022/0049470 A1, Feb. 17, 2022
Int. Cl. E02F 9/22 (2006.01); E02F 9/20 (2006.01); F16H 59/36 (2006.01); F16H 59/46 (2006.01); F16H 61/4008 (2010.01)
CPC E02F 9/2253 (2013.01) [E02F 9/2004 (2013.01); E02F 9/2285 (2013.01); F16H 59/46 (2013.01); F16H 61/4008 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F16H 2059/366 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A working machine comprising:
a prime mover;
a traveling pump configured to be driven by power of the prime mover so as to deliver hydraulic fluid;
a traveling motor configured to be rotated by the hydraulic fluid delivered from the traveling pump;
an operation valve configured to change a pilot pressure of pilot fluid output therefrom to the traveling pump according to operation of an operation member;
an actuation valve configured to be activated according to a control signal so as to change a primary pressure that is the pilot pressure of the pilot fluid to be supplied to the operation valve;
a controller configured or programmed to perform setting of the control signal to be output to the actuation valve; and
a pressure detection device configured to detect a secondary pressure that is the pilot pressure output from the operation valve, wherein
the controller includes
a setting change unit configured or programmed to change, based on the primary pressure and the secondary pressure, the setting of the control signal to be output to the actuation valve.