Hydraulic arrangement for a vehicle transmission
AssigneeDeere & Company
InventorsMICHAEL MEID, MANUEL BILLICH
Life of this patent
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Abstract
A hydraulic arrangement for a vehicle transmission includes a hydraulic pump for providing a system pressure for a first hydraulic system circuit and a lubrication pressure for a second hydraulic lubrication circuit. The arrangement also includes a control valve connected between a pump outlet of the pump and the two hydraulic circuits and has two different switching positions. The control valve, depending on the switching position, acts as a hydraulic connection between the pump and the system circuit or between the pump and the lubrication circuit.
Claims15
A hydraulic arrangement for a vehicle transmission, comprising:
- a hydraulic pump for providing a system pressure for a first hydraulic system circuit and a lubrication pressure for a second hydraulic lubrication circuit;
- a control valve connected between a pump outlet of the pump and the two hydraulic circuits and having two different switching positions;
- and
- a holding valve unit including an actuable electromagnet for releasably maintaining the second switching position of the control valve;
- wherein the control valve, depending on the switching position, acts as a hydraulic connection between the pump and the system circuit or between the pump and the lubrication circuit.
A hydraulic arrangement for a vehicle transmission, comprising:
- a hydraulic pump for providing a system pressure for a first hydraulic system circuit and a lubrication pressure for a second hydraulic lubrication circuit;
- a control valve connected between a pump outlet of the pump and the two hydraulic circuits and having two different switching positions;
- a holding valve unit including an actuable electromagnet for releasably maintaining the second switching position of the control valve;
- and
- a storage unit hydraulically connected to the system circuit;
- wherein the control valve, depending on the switching position, acts as a hydraulic connection between the pump and the system circuit or between the pump and the lubrication circuit;
- wherein the control valve changes the switching position if the system pressure reaches or drops below a predetermined minimum system pressure, or if the system pressure reaches or exceeds a predetermined maximum system pressure.
A hydraulic arrangement for a vehicle transmission, comprising:
- a hydraulic pump for providing a system pressure for a first hydraulic system circuit and a lubrication pressure for a second hydraulic lubrication circuit;
- a control valve connected between a pump outlet of the pump and the first hydraulic system circuit and the second hydraulic lubrication circuit and having a first and a second switching position;
- and
- a holding valve unit including an actuable electromagnet for releasably maintaining the second switching position of the control valve;
- wherein the control valve acts as a hydraulic connection between the pump and the system circuit in the first switching position and as a hydraulic connection between the pump and the lubrication circuit in the second switching position.
Dependencies are inferred from the claim text.