ATE52560T1 - FLOW RECOVERY SYSTEM FOR HYDRAULIC CIRCUITS WITH PUMPS AND PRESSURE-COMPENSATED DISTRIBUTION VALVES FOR WORKING LINKS OF EARTH-MOVING EQUIPMENT. - Google Patents
FLOW RECOVERY SYSTEM FOR HYDRAULIC CIRCUITS WITH PUMPS AND PRESSURE-COMPENSATED DISTRIBUTION VALVES FOR WORKING LINKS OF EARTH-MOVING EQUIPMENT.Info
- Publication number
- ATE52560T1 ATE52560T1 AT87830015T AT87830015T ATE52560T1 AT E52560 T1 ATE52560 T1 AT E52560T1 AT 87830015 T AT87830015 T AT 87830015T AT 87830015 T AT87830015 T AT 87830015T AT E52560 T1 ATE52560 T1 AT E52560T1
- Authority
- AT
- Austria
- Prior art keywords
- pressure
- earth
- pumps
- recovery system
- hydraulic circuits
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
- F15B2011/0243—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits the regenerative circuit being activated or deactivated automatically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
- F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5156—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
- Flow Control (AREA)
Abstract
A hydraulic control circuit for the working members of earth-moving machines having linear and rotary reversible hydraulic actuators (1-7) each of which is associated with an associated hydraulic distributor valve (8, 9) and a pressure compensator (17, 18) of the "load-sensing" type. One or more of the actuators (1-7) is further associated with a flow recovery device (25) including at least one recovery line (34) between the discharge (28) and the delivery (27) of the actuator for obtaining an additional closure pressure on the spool (29) of the compensator(17, 18) in such away as to cancel out unnecessary demands on the fluid flow rate from the pump (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67731/86A IT1195178B (en) | 1986-09-24 | 1986-09-24 | FLOW RATE RECOVERY SYSTEM FOR HYDRAULIC CIRCUITS WITH PUMPS AND PRESSURIZED PRESSURE INSTRUMENTS FOR WORKING PARTS OF EARTH-MOVING MACHINES |
EP87830015A EP0262098B1 (en) | 1986-09-24 | 1987-01-19 | A flow recovery system for hydraulic circuits with pumps and pressure compensated distributor valves for working members of earth-moving machines |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE52560T1 true ATE52560T1 (en) | 1990-05-15 |
Family
ID=11304850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT87830015T ATE52560T1 (en) | 1986-09-24 | 1987-01-19 | FLOW RECOVERY SYSTEM FOR HYDRAULIC CIRCUITS WITH PUMPS AND PRESSURE-COMPENSATED DISTRIBUTION VALVES FOR WORKING LINKS OF EARTH-MOVING EQUIPMENT. |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0262098B1 (en) |
JP (1) | JP2564308B2 (en) |
AT (1) | ATE52560T1 (en) |
DE (1) | DE3762639D1 (en) |
ES (1) | ES2015967B3 (en) |
GR (1) | GR3000479T3 (en) |
IT (1) | IT1195178B (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1208866B (en) * | 1987-04-14 | 1989-07-10 | Chs Vickers Spa | HYDRAULIC CONTROL CIRCUIT FOR EARTH-MOVING MACHINE WORKING BODIES WITH ABOVE MENTION CIRCUIT |
AU603907B2 (en) * | 1987-06-30 | 1990-11-29 | Hitachi Construction Machinery Co. Ltd. | Hydraulic drive system |
DE3883690T2 (en) * | 1987-10-05 | 1994-03-17 | Hitachi Construction Machinery | Hydraulic drive system. |
DE3844401C2 (en) * | 1988-12-30 | 1994-10-06 | Rexroth Mannesmann Gmbh | Control device for a variable displacement pump |
JP2839625B2 (en) * | 1990-03-05 | 1998-12-16 | 日立建機株式会社 | Hydraulic drive |
US5220862A (en) * | 1992-05-15 | 1993-06-22 | Caterpillar Inc. | Fluid regeneration circuit |
JP2992434B2 (en) * | 1993-12-02 | 1999-12-20 | 日立建機株式会社 | Hydraulic control device for construction machinery |
JPH08105405A (en) * | 1994-09-29 | 1996-04-23 | Samsung Heavy Ind Co Ltd | Control valve of monoblock with reproducing flow path |
JP3478931B2 (en) * | 1996-09-20 | 2003-12-15 | 新キャタピラー三菱株式会社 | Hydraulic circuit |
GB2344809B (en) * | 1998-12-16 | 2002-10-02 | Bamford Excavators Ltd | Earth moving apparatus |
DE10004905C2 (en) * | 2000-02-04 | 2002-10-24 | Orenstein & Koppel Ag | Method and device for controlling a lifting cylinder, in particular of working machines |
KR100674158B1 (en) * | 2003-01-14 | 2007-01-24 | 히다치 겡키 가부시키 가이샤 | Hydraulic working machine |
JP4209705B2 (en) * | 2003-03-17 | 2009-01-14 | 日立建機株式会社 | Working machine hydraulic circuit |
US20220307527A1 (en) * | 2021-03-23 | 2022-09-29 | Cnh Industrial America Llc | System to reduce line loss in pressure control hydraulic circuit |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1401412A (en) * | 1964-04-23 | 1965-06-04 | Faucheux Ets | Device for hydraulically correcting the movement of a mechanical component, for example a bucket, at the end of a lifting arm |
US3467126A (en) * | 1966-03-21 | 1969-09-16 | Hydranamic Systems Corp | Hydraulic load compensating directional control valve |
US4364304A (en) * | 1976-01-21 | 1982-12-21 | Danfoss A/S | Arrangement for influencing the operating quantity of a servomotor |
US4216702A (en) * | 1978-05-01 | 1980-08-12 | Eaton Yale Ltd. | Pressure sensing regenerative hydraulic system |
US4383412A (en) * | 1979-10-17 | 1983-05-17 | Cross Manufacturing, Inc. | Multiple pump load sensing system |
DE3245288A1 (en) * | 1982-12-03 | 1984-06-14 | O & K Orenstein & Koppel Ag, 1000 Berlin | METHOD FOR SAVING ENERGY WHEN SETTING AN EQUIPMENT CYLINDER ON A HYDRAULIC EXCAVATOR BY A HYDRAULIC CIRCUIT |
IT1234937B (en) * | 1985-02-14 | 1992-06-02 | Cinotto Hydraulic | ANTI-SATURATION SYSTEM FOR HYDRAULIC CONTROL CIRCUITS WITH PUMPS AND PRESSURE-CONTROLLED DISTRIBUTORS FOR WORKING PARTS OF EARTH-MOVING MACHINES |
IT1187892B (en) * | 1986-02-04 | 1987-12-23 | Chs Vickers Spa | HYDRAULIC CONTROL CIRCUIT FOR WORKING BODIES OF EARTH-MOVING MACHINES WITH CENTRALIZED ACTUATOR BRAKING |
-
1986
- 1986-09-24 IT IT67731/86A patent/IT1195178B/en active
-
1987
- 1987-01-19 EP EP87830015A patent/EP0262098B1/en not_active Expired - Lifetime
- 1987-01-19 ES ES87830015T patent/ES2015967B3/en not_active Expired - Lifetime
- 1987-01-19 AT AT87830015T patent/ATE52560T1/en not_active IP Right Cessation
- 1987-01-19 DE DE8787830015T patent/DE3762639D1/en not_active Expired - Fee Related
- 1987-05-30 JP JP62137576A patent/JP2564308B2/en not_active Expired - Lifetime
-
1990
- 1990-05-10 GR GR90400239T patent/GR3000479T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0262098B1 (en) | 1990-05-09 |
IT1195178B (en) | 1988-10-12 |
ES2015967B3 (en) | 1990-09-16 |
IT8667731A0 (en) | 1986-09-24 |
GR3000479T3 (en) | 1991-06-28 |
JP2564308B2 (en) | 1996-12-18 |
JPS6383808A (en) | 1988-04-14 |
DE3762639D1 (en) | 1990-06-13 |
EP0262098A1 (en) | 1988-03-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ATE52560T1 (en) | FLOW RECOVERY SYSTEM FOR HYDRAULIC CIRCUITS WITH PUMPS AND PRESSURE-COMPENSATED DISTRIBUTION VALVES FOR WORKING LINKS OF EARTH-MOVING EQUIPMENT. | |
US3987623A (en) | Controlled priority fluid system of a crawler type vehicle | |
US4210061A (en) | Three-circuit fluid system having controlled fluid combining | |
JPS6011706A (en) | Liquid pressure type apparatus having at least two working apparatuses loaded by one pump | |
US4215720A (en) | Fluid control valve system | |
US4055046A (en) | Control system having override for fluid operated work elements | |
EP0160289A3 (en) | Hydraulic control system | |
US3878679A (en) | Compensated multi-function hydraulic system | |
WO1992001162A1 (en) | Load pressure duplicating circuit | |
US4845948A (en) | Hydraulic circuit with a booster circuit for operating the working members of earth-moving machines | |
AU645461B2 (en) | Load sensing hydraulic control system | |
EP0709579B1 (en) | Straight travelling apparatus for heavy construction equipment | |
EP0191275B1 (en) | Anti-saturation system for hydraulic control circuits for working members of earth-moving machines | |
SE8503569L (en) | DEVICE OF A HYDRAULIC CIRCUIT INCLUDING A PRESSURE FLUID BELL AND AT LEAST A HYDRAULIC ENGINE | |
DE3873576D1 (en) | HYDRAULIC CONTROL DEVICE FOR CONSUMER GROUPS. | |
ES8307173A1 (en) | A steering system. | |
EP0404946A4 (en) | Hydraulic circuit device of construction vehicle | |
EP0550257B1 (en) | Device for controlling multiple hydraulic actuators | |
JPH0328501A (en) | Hydraulic circuit of working machine cylinder | |
GB1057752A (en) | Control system for hydraulically operated equipment such as excavators | |
ES8402641A1 (en) | Hydraulic control system for a hydraulic actuator. | |
EP1522740A1 (en) | A cushion valve for hydraulic remote controls of hydraulic directional valves | |
KR960008717Y1 (en) | Oil-pressure control apparatus of bulldozer blade | |
KR970011612B1 (en) | Travel driving system for heavy equipment | |
SU985472A1 (en) | Hydraulic drive |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
UEP | Publication of translation of european patent specification | ||
REN | Ceased due to non-payment of the annual fee |