EP 0904467 B1 20000301 - ROTARY MECHANISM CONTROL WITH POWER SUPPLY
Title (en)
ROTARY MECHANISM CONTROL WITH POWER SUPPLY
Title (de)
DREHWERKSTEUERUNG MIT SPEISEEINRICHTUNG
Title (fr)
COMMANDE DE MECANISME ROTATIF A SYSTEME D'ALIMENTATION
Publication
Application
Priority
- DE 19620665 A 19960522
- EP 9701920 W 19970417
Abstract (en)
[origin: DE19620665C1] The invention relates to a hydraulic control, especially for the rotary mechanism of an excavator. In a drive circuit there are a hydraulic drive pump (2) and a hydraulic drive motor connected via operating lines (4, 3). The hydraulic control comprises an adjuster (9) to adjust a piston (12) fitted between two setting pressure chambers (10, 11) and acting on the displacement volume of a hydraulic drive pump (2). There is also a pre-control unit (8) which applies an adjusting pressure to one of the setting pressure chambers (10, 11) depending on the pressure difference between two control lines (6, 7). According to the embodiment of the inventin, the pre-control unit (8) is connected to a supply line (30) via a pressure regulating valve (56), and, in a pilot position (42, 43), the pre-control unit (8) connects one of the two setting pressure chambers (10, 11) via the pressure regulating valve (56) to the supply line (30) and the other chamber (11, 10) to a pressurising fluid tank (17). In a neutral position (61), both setting pressure chambers (10, 11) are connected to the supply line (30) via the pressure regulating valve (56).
IPC 1-7
IPC 8 full level
E02F 9/12 (2006.01); E02F 9/22 (2006.01); F04B 49/00 (2006.01); F04B 49/08 (2006.01); F15B 11/00 (2006.01)
CPC (source: EP US)
E02F 9/123 (2013.01 - EP US); E02F 9/128 (2013.01 - EP US); E02F 9/2285 (2013.01 - EP US); E02F 9/2296 (2013.01 - EP US); F04B 49/08 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
DE 19620665 C1 19970612; DE 59701185 D1 20000406; EP 0904467 A1 19990331; EP 0904467 B1 20000301; JP 2000510933 A 20000822; US 6167702 B1 20010102; WO 9744535 A1 19971127
DOCDB simple family (application)
DE 19620665 A 19960522; DE 59701185 T 19970417; EP 9701920 W 19970417; EP 97918141 A 19970417; JP 54144297 A 19970417; US 11785198 A 19980812