EP 1255930 B1 20050601 - HYDRAULIC CONTROL CIRCUIT FOR A HYDRAULIC ENGINE WITH AT LEAST TWO SPEEDS
Title (en)
HYDRAULIC CONTROL CIRCUIT FOR A HYDRAULIC ENGINE WITH AT LEAST TWO SPEEDS
Title (de)
HYDRAULISCHE STEUERSCHALTUNG FÜR EINEN HYDROMOTOR MIT MINDESTENS ZWEI GESCHWINDIGKEITEN
Title (fr)
CIRCUIT DE COMMANDE HYDRAULIQUE D'UN MOTEUR HYDRAULIQUE A AU MOINS DEUX VITESSES
Publication
Application
Priority
- DE 10007155 A 20000217
- DE 10041435 A 20000823
- EP 0101702 W 20010215
Abstract (en)
[origin: WO0161186A1] The invention relates to a hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side (22, 122, 222) being connected to the discharge side (24, 124, 224, 324) with a bypass connection by means of a valve arrangement 830, 130, 230, 330, 430) for a selected number of engine pistons. The aim of the invention is to provide a particularly space-saving means of ensuring that the changeover between speeds occurs smoothly and in such a manner as to preserve the individual components as far as possible. To this end, at least one intermediate switching position (230-Z; 330-Z2; 330-Z3), in which the delivery side (22, 122, 222) is throttled to the discharge side (24, 124, 224, 324), i.e. connected via a diaphragm-type arrangement (231; A1; A2; 282; 284-A; 284-B; 286-B; 382-2; 384-2), is provided in front of valve arrangement (30, 130, 230, 330, 430) between the two end switching positions. The valve arrangement (30, 130, 230, 330, 430) is preferably driven in such a way that a valve body (270, 370, 470) can be moved through the intermediate switching position at a controlled speed.
IPC 1-7
IPC 8 full level
F03C 1/26 (2006.01); F03C 1/40 (2006.01); F15B 11/02 (2006.01); F15B 11/16 (2006.01)
CPC (source: EP US)
F03C 1/045 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 0161186 A1 20010823; EP 1255930 A1 20021113; EP 1255930 B1 20050601; US 2003167770 A1 20030911; US 7090475 B2 20060815
DOCDB simple family (application)
EP 0101702 W 20010215; EP 01909759 A 20010215; US 20362502 A 20021016