Title:
EHA SYSTEM FOR LIFTING/LOWERING LANDING GEAR
Document Type and Number:
WIPO Patent Application WO/2021/186808
Kind Code:
A1
Abstract:
An EHA system (10) for lifting/lowering landing gear is provided with: a hydraulic circuit (101) comprising a hydraulic actuator (hydraulic cylinder 2) for lifting/lowering landing gear of an aircraft, at least one electric hydraulic pump (3), and a hydraulic path; pressure sensors (38, 83); a temperature sensor (84); and a control unit (controller 9) which outputs a control signal for operating the electric hydraulic pump during lifting/lowering of the landing gear. The hydraulic circuit includes a pressure boosting element; meanwhile, when the electric hydraulic pump is operating, the control unit performs health monitoring with respect to the performance of the electric hydraulic pump on the basis of the pressure and temperature of hydraulic oil and the rotation speed of the electric hydraulic pump.
Inventors:
HAGIHARA SHOGO (JP)
ONISHI TAKAAKI (JP)
ONISHI TAKAAKI (JP)
Application Number:
PCT/JP2020/045722
Publication Date:
September 23, 2021
Filing Date:
December 08, 2020
Export Citation:
Assignee:
SUMITOMO PRECISION PROD CO (JP)
International Classes:
B64C25/22; B64C25/28; B64D45/00; F04B49/10; F04B51/00; F15B21/047
Foreign References:
| US20170069145A1 | 2017-03-09 | |||
| JP2012176645A | 2012-09-13 | |||
| US20140373611A1 | 2014-12-25 | |||
| CN104454791A | 2015-03-25 | |||
| DE102018129220A1 | 2020-05-20 | |||
| JP2014132189A | 2014-07-17 |
Other References:
See also references of EP 4105120A4
Attorney, Agent or Firm:
MAEDA & PARTNERS (JP)
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