US 12,258,734 B2
Working control device in working vehicle
Kengo Kumeuchi, Chikuma (JP); Yuta Kobayashi, Tomi (JP); Shumpei Okutani, Ueda (JP); and Koichi Shimizu, Ueda (JP)
Assigned to Takeuchi Mfg. Co., Ltd., Nagano (JP)
Filed by Takeuchi Mfg. Co., Ltd., Nagano (JP)
Filed on Jan. 19, 2022, as Appl. No. 17/579,266.
Claims priority of application No. 2021-178942 (JP), filed on Nov. 1, 2021.
Prior Publication US 2023/0133546 A1, May 4, 2023
Int. Cl. E02F 9/22 (2006.01)
CPC E02F 9/2235 (2013.01) [E02F 9/2228 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A working control device for a working vehicle with a hydraulic working device, comprising:
a hydraulic actuator for driving the hydraulic working device;
an operation device that is operated by an operator to drive the hydraulic working device upon making the hydraulic actuator work;
a hydraulic oil supply source that includes a hydraulic pump and delivers hydraulic oil required to drive the hydraulic actuator; and
a controller that controls an amount of oil to be delivered from the hydraulic oil supply source in response to an operation of the operation device, wherein
the controller is configured to perform a supplying oil amount control to deliver from the hydraulic oil supply source a required amount of oil for the hydraulic actuator to have a working speed corresponding to the operation of the operation device without causing a pressure difference between a hydraulic pressure supplied from the hydraulic oil supply source and a hydraulic pressure supplied to the hydraulic actuator,
a hydraulic oil supply control device that includes a hydraulic oil supply control valve is provided in a flow path leading to the hydraulic actuator from the hydraulic oil supply source and controls an area of the flow path in response to an operation of the operation device, and
the hydraulic oil supply control device performs a control of setting the flow path area in response to an operation of the operation device so as to pass a required amount of oil without limitation, but to limit supply of hydraulic oil exceeding the required amount of oil.