US 12,256,655 B2
Hydraulic steering device for agricultural work vehicle
Sang Heon Lee, Anyang-si (KR)
Assigned to LS MTRON LTD., Anyang-si (KR)
Appl. No. 17/628,837
Filed by LS MTRON LTD., Anyang-si (KR)
PCT Filed Jul. 21, 2020, PCT No. PCT/KR2020/009578
§ 371(c)(1), (2) Date Jan. 20, 2022,
PCT Pub. No. WO2021/015528, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 10-2019-0088265 (KR), filed on Jul. 22, 2019; application No. 10-2020-0088117 (KR), filed on Jul. 16, 2020; and application No. 10-2020-0088127 (KR), filed on Jul. 16, 2020.
Prior Publication US 2022/0264785 A1, Aug. 25, 2022
Int. Cl. B62D 5/065 (2006.01); A01B 69/04 (2006.01); B62D 5/093 (2006.01)
CPC A01B 69/008 (2013.01) [B62D 5/065 (2013.01); B62D 5/093 (2013.01)] 17 Claims
OG exemplary drawing
 
17. A hydraulic steering device for an agricultural vehicle, the hydraulic steering device comprising:
a steering pump configured to supply a working fluid;
an automatic steering unit connected to the steering pump and configured to, as automatic steering is performed by a controller, use the working fluid supplied from the steering pump to change a traveling direction of the agricultural vehicle;
a manual steering unit connected to each of the steering pump and the automatic steering unit and configured to, as manual steering is performed by manipulation of a steering wheel, change the traveling direction of the agricultural vehicle;
an automatic blocking unit configured to, according to whether the manual steering is performed, selectively block the working fluid for the automatic steering from being supplied to a steering cylinder of the agricultural vehicle,
a selection unit configured to selectively supply the working fluid supplied from the steering pump toward any one of the manual steering unit and the automatic steering unit, wherein the selection unit includes:
a selection valve configured to move between a manual selection position at which the selection valve supplies the working fluid supplied from the steering pump toward the manual steering unit and a steering selection position at which the selection valve supplies the working fluid supplied from the steering pump toward the automatic steering unit;
a selection supply line having one side connected to a pump supply line connected to the steering pump and the other side connected to an inlet side of the selection valve; and
a selection discharge line having one side connected to a manual supply line connected to the manual steering unit and the other side connected to an outlet side of the selection valve, and
a manual changing unit connected to each of the steering pump and the manual steering unit;
wherein:
the manual steering unit is connected to the steering pump through the manual changing unit,
the manual changing unit blocks passage of the working fluid supplied from the steering pump when the automatic steering is performed in a state in which the manual steering is not performed and causes the working fluid supplied from the steering pump to pass when the automatic steering is not performed in the state in which the manual steering is not performed or when the manual steering is performed,
the manual steering unit changes, through the manual changing unit, the traveling direction of the agricultural vehicle using the working fluid supplied from the steering pump when the manual steering is performed,
an automatic supply line connected to the automatic steering unit or the automatic blocking unit is connected to the outlet side of the selection valve, and
the selection valve connects the selection supply line and the selection discharge line when disposed at the manual selection position and connects the selection supply line and the automatic supply line when disposed at the steering selection position.