# US 12,180,944 B2 · Control device for gearbox

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- Number: US 12,180,944 B2
- Document ID: US12180944B2
- Status: Granted
- Kind: B2
- Application number: 18/693,222
- Filed: 2022-08-29
- Published: 2024-08-08
- Granted: 2024-12-31
- Earliest claimed: 2021-09-23
- Assignees: Zf Wind Power (Tianjin) Co., Ltd.; Zf Wind Power Antwerpen N.V.
- Applicants: Zf Wind Power (Tianjin) Co., Ltd.; ZF Wind Power Antwerpen N.V.
- Inventors: Fuliang Wang
- Web page: https://patentgrep.com/patent/US12180944B2

## CPC

- F03D 80/70: Bearing or lubricating arrangements
- F03D 80/707: {Gearing lubrication, e.g. gear boxes}
- F16H 57/0413: {Controlled cooling or heating of lubricant; Temperature control therefor}
- F16H 57/0435: {Pressure control for supplying lubricant; Circuits or valves therefor}
- F16H 57/0436: {Pumps}
- F16H 57/0439: {using multiple pumps with different power sources or a single pump with different power sources, e.g. one and the same pump may selectively be driven by either the engine or an electric motor}
- F16H 61/0031: {using auxiliary pumps, e.g. pump driven by a different power source than the engine}
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- F03D: WIND MOTORS
- F16H: GEARING
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A control device for a gearbox which includes a mechanical pump and an electric pump, the mechanical pump having a first-stage displacement and a second-stage displacement, and the first-stage displacement being less than the second-stage displacement, the control device including a sensor module for detecting an oil pressure of a lubricating oil of the gearbox and a mechanical pump control module for, when the oil pressure is above an oil pressure threshold, controlling the mechanical pump to operate at the first-stage displacement, and when the oil pressure is below the oil pressure threshold, controlling the mechanical pump to operate at the second-stage displacement.

## Claims

### Claim 1

A control device for a gearbox which comprises a mechanical pump and an electric pump, the mechanical pump having a first-stage displacement and a second-stage displacement, and the first-stage displacement being less than the second-stage displacement, the control device comprising:
a sensor module for detecting an oil pressure of a lubricating oil of the gearbox; and
a mechanical pump control module configured to, when the oil pressure is above an oil pressure threshold, control the mechanical pump to operate at the first-stage displacement, and when the oil pressure is below the oil pressure threshold, control the mechanical pump to operate at the second-stage displacement.

### Claim 2 (depends on 1)

The control device of claim 1, wherein the mechanical pump is a two-stage variable displacement pump.

### Claim 3 (depends on 1)

The control device of claim 1, wherein the mechanical pump is a continuously variable displacement pump.