US 12,098,524 B2
Working machine
Yuji Fukuda, Osaka (JP); Kohei Nagao, 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 Sep. 29, 2023, as Appl. No. 18/374,772.
Application 18/374,772 is a division of application No. 17/394,645, filed on Aug. 5, 2021, granted, now 11,814,815.
Claims priority of application No. 2020-137180 (JP), filed on Aug. 15, 2020; application No. 2020-180868 (JP), filed on Oct. 28, 2020; and application No. 2021-120850 (JP), filed on Jul. 21, 2021.
Prior Publication US 2024/0026648 A1, Jan. 25, 2024
Int. Cl. E02F 9/22 (2006.01); F15B 21/0427 (2019.01); F16H 61/02 (2006.01); F16H 61/4157 (2010.01); F16H 61/421 (2010.01); F16H 61/444 (2010.01); F16H 61/448 (2010.01)
CPC E02F 9/2246 (2013.01) [E02F 9/2253 (2013.01); E02F 9/226 (2013.01); E02F 9/2285 (2013.01); E02F 9/2289 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F15B 21/0427 (2019.01); F16H 61/0206 (2013.01); F16H 61/4157 (2013.01); F16H 61/421 (2013.01); F16H 61/444 (2013.01); F16H 61/448 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A working machine comprising:
a prime mover;
a traveling device;
a traveling motor configured to output power to the traveling device;
a traveling pump configured to supply hydraulic fluid when a hydraulic pressure is applied to the traveling pump;
a circulation fluid passage fluidly connecting the traveling pump to the traveling motor;
a traveling switching valve shiftable between a first state corresponding to a first speed of a hydraulic motor and a second state corresponding to a second speed of the hydraulic motor faster than the first speed;
a brake shiftable between a braking state to brake the traveling motor and a braking releasing state to release the braking;
an actuation valve configured to output the hydraulic pressure applied to the traveling pump, and change the hydraulic pressure output therefrom; and
a controller configured or programmed to control the traveling switching valve, the brake and the actuation valve, and being capable of activating a first mode, wherein
the controller is configured or programmed to, when activating the first mode, shift the brake into the braking state, shift the traveling switching valve into the second state, and control the actuation valve so as to set the hydraulic pressure output from the actuation valve to a predetermined pressure.