Hydraulic arrangement for a vehicle transmission

Patent metadata

Field	Value
Publication number	US-11971097-B2
Application number	US-202218053514-A
Country	US
Kind code	B2
Filing date	Nov 8, 2022
Priority date	Apr 15, 2020
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

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.

First claim

The invention claimed is:

1. 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; and
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;
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.

2. The arrangement of claim 1 , further comprising a storage unit hydraulically connected to the system circuit.

3. The arrangement of claim 1 , 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.

4. The arrangement of claim 3 , wherein, based on a falling system pressure after the system pressure measured via the pressure transducer reaches or drops below the minimum system pressure, the control valve moves to the first switching position via the control electronics for a hydraulic connection of the pump to the system circuit.

5. The arrangement of claim 3 , wherein, based on a rising system pressure after the system pressure measured via the pressure transducer reaches or exceeds the maximum system pressure, the control valve moves to the second switching position via the control electronics for a hydraulic connection of the pump to the lubrication circuit.

6. The arrangement of claim 1 , wherein the control valve comprises a 3/2-way valve.

7. The arrangement of claim 1 , wherein the holding valve unit is actuable depending on the system pressure.

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.

9. The arrangement of claim 8 , wherein:
based on a falling system pressure after the system pressure measured via the pressure transducer reaches or drops below the minimum system pressure, the control valve moves to the first switching position via the control electronics for a hydraulic connection of the pump to the system circuit; and
based on a rising system pressure after the system pressure measured via the pressure transducer reaches or exceeds the maximum system pressure, the control valve moves to the second switching position via the control electronics for a hydraulic connection of the pump to the lubrication circuit.

10. The arrangement of claim 8 , wherein the control valve comprises a 3/2-way valve.

11. The arrangement of claim 8 , wherein the holding valve unit is actuable depending on the system pressure.

12. 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 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;
wherein the control valve acts as a hydraulic connection only between the pump and the system circuit in the first switching position and as a hydraulic connection only between the pump and the lubrication circuit in the second switching position.

13. The arrangement of claim 12 , further comprising a storage unit hydraulically connected to the system circuit.

14. The arrangement of claim 12 , wherein:
when the system pressure measured via the pressure transducer reaches or drops below a minimum system pressure, the control valve moves to the first switching position via the control electronics for the hydraulic connection of the pump to the system circuit; and
when the system pressure measured via the pressure transducer reaches or exceeds the maximum system pressure, the control valve moves to the second switching position via the control electronics for the hydraulic connection of the pump to the lubrication circuit.

15. The arrangement of claim 12 , wherein the holding valve unit is actuable depending on the system pressure.

Assignees

• Deere & Co

Inventors

• Meid Michael
• Billich Manuel

Classifications

• F16H61/0021 Primary

  Generation or control of line pressure · CPC title

• F15B13/042

  operated by fluid pressure {(F15B13/0401, F15B13/0416 take precedence)} · CPC title

• F16H57/0435

  Pressure control for supplying lubricant; Circuits or valves therefor · CPC title

• F16H57/0446

  the supply forming part of the transmission control unit, e.g. for automatic transmissions · CPC title

• F16K11/105

  Three-way check or safety valves with two or more closure members · CPC title