EP 3931444 B1 20221116 - HYDRAULIC ACTUATOR FOR COMPENSATION OF OVER PRESSURE
Title (en)
HYDRAULIC ACTUATOR FOR COMPENSATION OF OVER PRESSURE
Title (de)
HYDRAULISCHES STELLGLIED ZUR KOMPENSIERUNG VON ÜBERDRUCK
Title (fr)
ACTIONNEUR HYDRAULIQUE A COMPENSATION DE SURPRESSION
Publication
Application
Priority
- FR 1901923 A 20190225
- EP 2020054895 W 20200225
Abstract (en)
[origin: WO2020173933A1] The invention relates to a hydraulic actuator comprising a variable-output positive-displacement pump (12), a member (20) allowing the output of the pump (12) to be varied continuously, the member (20) being actuated by a cylinder (40) fed from a first directional-control valve (48) operated according to a command controlling the movement of the actuator (10). According to the invention, the actuator (10) comprises a second directional-control valve (60) controlled according to an output pressure (P) of the pump (12), the second directional-control valve (60) having two positions, one of them (60a), known as the rest position, being obtained as long as the output pressure (P) of the pump (12) is below a predetermined pressure and transmitting the output from the first directional-control valve (48) to the double-acting cylinder (40), and the other (60b), known as the active position, transmitting the output pressure (P) of the pump (12) to the cylinder (40) in such a way as to reduce the output pressure (P) of the pump (12) without passing via the first directional-control valve (48).
IPC 8 full level
F04B 1/32 (2020.01); F04B 49/08 (2006.01)
CPC (source: EP US)
F04B 1/32 (2013.01 - EP US); F04B 49/08 (2013.01 - EP US); F04B 2203/0605 (2013.01 - US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2020173933 A1 20200903; CN 113454338 A 20210928; CN 113454338 B 20230523; EP 3931444 A1 20220105; EP 3931444 B1 20221116; FR 3093138 A1 20200828; FR 3093138 B1 20220715; JP 2022523352 A 20220422; US 2022145868 A1 20220512
DOCDB simple family (application)
EP 2020054895 W 20200225; CN 202080016095 A 20200225; EP 20705749 A 20200225; FR 1901923 A 20190225; JP 2021549131 A 20200225; US 202017431153 A 20200225