US 11,953,035 B2
Working machine
Daiki Abe, Osaka (JP); Ryota Hamamoto, Osaka (JP); and Hiroaki Nakagawa, Osaka (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on Jul. 12, 2023, as Appl. No. 18/221,055.
Application 18/221,055 is a division of application No. 17/396,143, filed on Aug. 6, 2021, granted, now 11,781,572.
Claims priority of application No. 2020-137175 (JP), filed on Aug. 15, 2020; and application No. 2020-137182 (JP), filed on Aug. 15, 2020.
Prior Publication US 2023/0349402 A1, Nov. 2, 2023
Int. Cl. F15B 21/0423 (2019.01); E02F 9/22 (2006.01); F01P 7/04 (2006.01); F15B 21/02 (2006.01)
CPC F15B 21/0423 (2019.01) [E02F 9/2246 (2013.01); E02F 9/226 (2013.01); F01P 7/044 (2013.01); F15B 21/02 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/62 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A working machine comprising:
a prime mover;
a hydraulic pump driven by power of the prime mover;
a cooler including a cooling fan rotated by hydraulic fluid delivered from the hydraulic pump;
a controller configured or programmed
to perform a reduction control for reducing a target fan rotation speed that is a target rotation speed of the cooling fan when an actual prime mover rotation speed that is an actual rotation speed of the prime mover is reduced to a value less than a threshold rotation speed, and
to perform, after the reduction control, a restoration control for restoring the target fan rotation speed set before the reduction control; and
a prime mover rotation setting member configured to output, to the controller, an operation signal to instruct a target prime mover rotation speed that is a target rotation speed of the prime mover, wherein
the controller is configured or programmed
to control the target prime mover rotation speed based on an instructed prime mover rotation speed that is an instructed rotation speed instructed by the prime mover rotation setting member, and
to change the threshold rotation speed in correspondence to variation of the instructed prime mover rotation speed.