Patent ID: 11971097
Assignee: DEERE & COMPANY
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 7:
8. 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 first switching position and a second switching position;
a holding valve unit connected between the system circuit and the control valve, the holding valve unit including an actuable electromagnet for releasably maintaining the second switching position of the control valve, the electromagnet actuated by a control electronics connected to a pressure transducer measuring the system pressure in the system circuit; and
a storage unit hydraulically connected to the system circuit;
wherein the control valve, depending on the switching position, acts as a hydraulic connection only between the pump and the system circuit in the first switching position or only between the pump and the lubrication circuit in the second switching position;
wherein the control electronics changes the switching position of the control valve to the first switching position via the holding valve unit if the system pressure measured via the pressure transducer reaches or drops below a predetermined minimum system pressure, and the control electronics changes the switching position of the control valve to the second switching position via the holding valve unit if the system pressure measured via the pressure transducer reaches or exceeds a predetermined maximum system pressure.