US 11,739,773 B2
Working machine
Daiki Abe, Osaka (JP); Yuji Fukuda, 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. 17/396,143.
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 2022/0049729 A1, Feb. 17, 2022
Int. Cl. F15B 21/0423 (2019.01); F01P 7/04 (2006.01); E02F 9/22 (2006.01); F15B 21/02 (2006.01)
CPC F15B 21/0423 (2019.01) [E02F 9/226 (2013.01); F01P 7/044 (2013.01); F15B 21/02 (2013.01); F15B 2211/62 (2013.01)] 10 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; and
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 in response to reduction of an actual prime mover rotation speed that is an actual rotation speed of the prime mover, and
to perform, after the reduction control, a restoration control for restoring the target fan rotation speed, wherein
the controller is configured or programmed to make a difference between a reduction rate of the target fan rotation speed in the reduction control and an increase rate of the target fan rotation speed in the restoration control.