Hydraulic operating device for a cooling fan of a utility vehicle
AssigneeDeere & Company
InventorsManuel Billich, Michael Meid
Life of this patent
Estimating the term…
Abstract
A hydraulic operating device for a cooling fan of a utility vehicle includes a hydraulic motor and a fan assembly, which can be driven by the hydraulic motor for generating a cooling air stream. A hydraulic supply is adjustable in terms of its delivery volume in accordance with pressure feedback for providing pressurized hydraulic liquid. A control valve for setting, in a manner dependent on a control signal that represents a cooling demand, a volume flow that passes through the hydraulic motor, with a sensor line that is branched off in a supply line between the control valve and the hydraulic motor leading to a pressure control inlet of the hydraulic supply.
Claims13
A hydraulic operating device for a cooling fan of a utility vehicle, comprising:
- a hydraulic motor;
- a fan assembly, which can be driven by the hydraulic motor for generating a cooling air stream;
- a hydraulic supply, which is adjustable in terms of its delivery volume in accordance with pressure feedback, for providing pressurized hydraulic liquid;
- and
- a control valve for setting, in a manner dependent on a control signal that represents a cooling demand, a volume flow that passes through the hydraulic motor, with a sensor line that is branched off in a supply line between the control valve and the hydraulic motor leading to a pressure control inlet of the hydraulic supply;
- wherein, in the sensor line, there is arranged a pressure-limiting valve which opens in the direction of the pressure control inlet of the hydraulic supply and which is responsive to pressure feedback;
- and
- wherein, in the sensor line, there is also arranged a throttle element which is configured as a constant throttle and which is in the form of an orifice or nozzle.
A hydraulic operating device for a cooling fan of a utility vehicle, comprising:
- a hydraulic motor;
- a fan assembly, which can be driven by the hydraulic motor for generating a cooling air stream;
- a hydraulic supply, which is adjustable in terms of its delivery volume in accordance with pressure feedback, for providing pressurized hydraulic liquid;
- and
- a control valve for setting, in a manner dependent on a control signal that represents a cooling demand, a volume flow that passes through the hydraulic motor, with a sensor line that is branched off in a supply line between the control valve and the hydraulic motor leading to a pressure control inlet of the hydraulic supply;
- wherein the control valve is a 2/2 directional proportional valve and is pressure-compensated;
- and
- wherein, in the sensor line, there is arranged a pressure-limiting valve which opens in the direction of the pressure control inlet of the hydraulic supply and which is responsive to pressure feedback;
- wherein, in the sensor line, there is also arranged a throttle element which is configured as a constant throttle and which is in the form of an orifice or nozzle.
A utility vehicle comprising:
- a hydraulic motor;
- a fan assembly, which can be driven by the hydraulic motor for generating a cooling air stream;
- a hydraulic supply, which is adjustable in terms of its delivery volume in accordance with pressure feedback, for providing pressurized hydraulic liquid;
- and
- a control valve for setting, in a manner dependent on a control signal that represents a cooling demand, a volume flow that passes through the hydraulic motor, with a sensor line that is branched off in a supply line between the control valve and the hydraulic motor leading to a pressure control inlet of the hydraulic supply;
- wherein, in the sensor line, there is arranged a pressure-limiting valve which opens in the direction of the pressure control inlet of the hydraulic supply and which is responsive to pressure feedback;
- wherein, in the sensor line, there is also arranged a throttle element which is configured as a constant throttle and which is in the form of an orifice or nozzle.
Dependencies are inferred from the claim text.