US 12,291,839 B2
Work vehicle
Kazuya Takeda, Abiko (JP); Kazuo Ishida, Ryuugasaki (JP); and Shoroku Kawahara, Ushiku (JP)
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Appl. No. 17/638,293
Filed by HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
PCT Filed Mar. 8, 2021, PCT No. PCT/JP2021/009082
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/192969, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-056505 (JP), filed on Mar. 26, 2020.
Prior Publication US 2022/0333337 A1, Oct. 20, 2022
Int. Cl. E02F 3/43 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01)
CPC E02F 3/43 (2013.01) [E02F 9/2012 (2013.01); E02F 9/2285 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A work vehicle comprising:
a vehicle body provided with front wheels and rear wheels;
a work device including an arm member which is mounted to a front portion of the vehicle body so as to rotatably move in an upper and lower direction, and a bucket which is mounted to a distal end portion of the arm member so as to dump and tilt;
a bucket cylinder for driving the bucket;
a hydraulic pump for supplying hydraulic oil to the bucket cylinder;
a directional control valve configured to control a flow of the hydraulic oil discharged from the hydraulic pump and supplied to the bucket cylinder;
a solenoid proportional valve configured to control the directional control valve;
a controller configured to control the solenoid proportional valve; and
an inclination sensor configured to detect an inclination angle of the vehicle body,
wherein the controller is configured to:
in a case where a height position of the bucket is higher than a predetermined height and the vehicle body is in a state of being inclined rearward, correct an angle of the bucket to a front side where the bucket dumps in accordance with the inclination angle of the vehicle body detected by the inclination sensor,
in a case where the height position of the bucket is higher than the predetermined height and the vehicle body is in a state of being inclined forward, correct the angle of the bucket to a rear side where the bucket tilts in accordance with the inclination angle of the vehicle body detected by the inclination sensor,
in a case where the height position of the bucket is equal to or less than the predetermined height, not to correct the angle of the bucket even in both the states where the vehicle body is being inclined rearward and the vehicle body is being inclined forward, and
in a case where an absolute value of the inclination angle of the vehicle body is less than a predetermined inclination angle, not to correct the angle of the bucket.