EP 2952750 B1 20180905 - Hydraulic system
Title (en)
Hydraulic system
Title (de)
Hydrauliksystem
Title (fr)
Système hydraulique
Publication
Application
Priority
EP 14171118 A 20140604
Abstract (en)
[origin: WO2015185644A1] The invention relates to a hydraulic drive (1) comprising a working cylinder (2) and a travel cylinder (3) which is mechanically connected to the working cylinder (2). The working cylinder (2) and the travel cylinder (3) each comprise an upper and a lower cylinder chamber (21, 22, 31, 32), and all four cylinder chambers (21, 22, 31, 32) of the working and travel cylinder (2, 3) are connected to one another in a suitable manner in a closed pressure circuit (4) which is filled and prestressed with a hydraulic fluid (F). A rotational speed-variable hydraulic machine (5) with a first and second pressure connection (51, 52) is arranged in the pressure circuit (4) in order to conduct the hydraulic fluid (F) between the individual cylinder chambers (21, 22, 31, 32) of the working and travel cylinder (2, 3) during the operation (B) of the hydraulic drive (1). At least one first and second distributing valve (6, 7) are arranged in the pressure circuit (4) such that the respective valve switch positions (61, 62, 71, 72, 73) which are suitable for the different operating phases of the hydraulic drive (1) together with the suitably driven hydraulic machine (5) allow a common movement of the work and travel cylinder (2, 3) in one or the other piston movement direction (R1, R2). For this purpose, preferably only the first and the second distributing valve (6, 7) are arranged in the pressure circuit (4). The hydraulic drive (1) requires a minimum number of components, maintains a low installation complexity, improves the energy efficiency, can be constructed in a compact manner, and can be operated in a sufficiently variable manner.
IPC 8 full level
F15B 11/02 (2006.01); B30B 15/16 (2006.01); F15B 11/036 (2006.01)
CPC (source: CN EP US)
B30B 1/323 (2013.01 - US); B30B 15/161 (2013.01 - EP US); F15B 11/022 (2013.01 - CN EP US); F15B 11/0365 (2013.01 - CN EP US); F15B 7/006 (2013.01 - CN EP US); F15B 2211/20515 (2013.01 - CN EP US); F15B 2211/20561 (2013.01 - CN EP US); F15B 2211/27 (2013.01 - CN EP US); F15B 2211/3058 (2013.01 - CN EP US); F15B 2211/7054 (2013.01 - CN EP US); F15B 2211/7056 (2013.01 - CN EP US); F15B 2211/775 (2013.01 - CN EP 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)
EP 2952750 A1 20151209; EP 2952750 B1 20180905; CN 106471262 A 20170301; CN 106471262 B 20200207; US 10626889 B2 20200421; US 2017108014 A1 20170420; WO 2015185644 A1 20151210
DOCDB simple family (application)
EP 14171118 A 20140604; CN 201580029083 A 20150603; EP 2015062409 W 20150603; US 201515316085 A 20150603