Title:
LANDING GEAR LIFTING/LOWERING EHA SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/179725
Kind Code:
A1
Abstract:
A landing gear lifting/lowering EHA system (10) is provided with: a hydraulic actuator (2) that elevates/lowers landing gear of an aircraft; at least one electric hydraulic pump (31, 32); a hydraulic path (101); pressure sensors (38, 39) that are attached to the hydraulic actuator or to the hydraulic path and that outputs a measurement signal corresponding to hydraulic pressure; and a control unit (controller 9) that outputs a control signal to the electric hydraulic pump. The control unit stops the electric hydraulic pump in operation when a state where the hydraulic pressure exceeds a set pressure continues for a set period of time, and resumes the operation of the electric hydraulic pump when the hydraulic pressure has decreased to a second set pressure or lower after the stoppage of the electric hydraulic pump.
Inventors:
ONISHI TAKAAKI (JP)
HAGIHARA SHOGO (JP)
HAGIHARA SHOGO (JP)
Application Number:
PCT/JP2020/008625
Publication Date:
September 10, 2020
Filing Date:
March 02, 2020
Export Citation:
Assignee:
SUMITOMO PRECISION PROD CO (JP)
International Classes:
B64C25/22; F15B20/00
Domestic Patent References:
| WO2018011975A1 | 2018-01-18 |
Foreign References:
| JP2018094969A | 2018-06-21 | |||
| JP2014132189A | 2014-07-17 | |||
| JP2016150632A | 2016-08-22 | |||
| US20170233064A1 | 2017-08-17 | |||
| JP2014132189A | 2014-07-17 |
Other References:
See also references of EP 3912906A4
Attorney, Agent or Firm:
MAEDA & PARTNERS (JP)
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