EP 0038128 A1 19811021 - Electro-hydraulic servo activator system.
Title (en)
Electro-hydraulic servo activator system.
Title (de)
Elektrohydraulisches Servosteuerungssystem.
Title (fr)
Système de servo-commande électro-hydraulique.
Publication
Application
Priority
US 13717180 A 19800404
Abstract (en)
An electro-hydraulic servo system combines a pilot spool valve [24] with a non-linear solenoid [25] to provide a pilot stage for a main control valve. The non-linear solenoid [25] counteracts the Bernoulli forces that act upon the pilot spool [31] in order to provide an overall desired linear response. The non-linear solenoid comprises an armature [42] with conical pole faces [38, 39] subject to the energizations of oppositely acting energizing coils [44,45], the armature [42] being biassed towards a normal position by means of a spring [43]. An actuator rod [41] couples the armature [42] to the spool [31] of the pilot spool valve [24].
IPC 1-7
IPC 8 full level
F15B 11/08 (2006.01); F15B 13/04 (2006.01); F15B 13/043 (2006.01); H01F 7/13 (2006.01)
CPC (source: EP KR)
F15B 11/08 (2013.01 - KR); F15B 13/0402 (2013.01 - EP); F15B 13/0435 (2013.01 - EP); H01F 7/13 (2013.01 - EP)
Citation (search report)
- GB 656208 A 19510815 - UNITED AIRCRAFT CORP
- US 4144514 A 19790313 - RINDE JOHN E, et al
- US 4071042 A 19780131 - LOMBARD CLAUDE EDMOND, et al
- US 2436992 A 19480302 - WALTER ERNST
- US 3740594 A 19730619 - CASEY G
- US 3858135 A 19741231 - GRAY S
- FR 2121841 A1 19720825 - METZ GMBH CARL
- FR 2265162 A1 19751017 - GRIFFET ETS M [FR]
- US 4031813 A 19770628 - WALTERS RONALD BERNARD, et al
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0038128 A1 19811021; CA 1163897 A 19840320; JP S56150603 A 19811121; KR 830005508 A 19830820; KR 840001175 B1 19840816
DOCDB simple family (application)
EP 81301263 A 19810324; CA 374541 A 19810402; JP 5046881 A 19810403; KR 810001110 A 19810402