Arrangement for controlling a hydraulic three-point hitch
AssigneeDeere & Company
InventorManuel Billich
Life of this patent
Estimating the term…
Abstract
An arrangement for controlling a hydraulic three-point hitch includes a double-acting hydraulic cylinder and first and second seat valves. The double-acting hydraulic cylinder has a first working chamber, by which pressurized hydraulic fluid can change the lifting position of a lower arm of the hydraulic three-point hitch, and a second working chamber connected to a control valve arrangement, by which a specified target pressure can be set in the second working chamber. The first and second seat valves are in fluid communication with the working chamber. The first seat valve selectively produces a flow connection to a high-pressure source. The second seat valve selectively produces a return connection to a hydraulic reservoir.
Claims12
An arrangement for controlling a hydraulic three-point hitch, comprising:
- a double-acting hydraulic cylinder with a first working chamber, by which pressurized hydraulic fluid can change the lifting position of a lower arm of the hydraulic three-point hitch, and a second working chamber connected to a control valve arrangement, by which a specified target pressure can be set in the second working chamber;
- and
- a first seat valve and a second seat valve in fluid communication with the working chamber, the first seat valve selectively producing a flow connection to a high-pressure source, and the second seat valve selectively producing a return connection to a hydraulic reservoir.
An agricultural tractor including an arrangement for controlling a hydraulic three-point hitch, comprising:
- a double-acting hydraulic cylinder with a first working chamber, by which pressurized hydraulic fluid can change the lifting position of a lower arm of the hydraulic three-point hitch, and a second working chamber connected to a control valve arrangement, by which a specified target pressure can be set in the second working chamber;
- and
- a first seat valve and a second seat valve in fluid communication with the working chamber, the first seat valve selectively producing a flow connection to a high-pressure source, and the second seat valve selectively producing a return connection to a hydraulic reservoir.
Dependencies are inferred from the claim text.