GB1297601A - - Google Patents
Info
- Publication number
- GB1297601A GB1297601A GB1297601DA GB1297601A GB 1297601 A GB1297601 A GB 1297601A GB 1297601D A GB1297601D A GB 1297601DA GB 1297601 A GB1297601 A GB 1297601A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spool
- pressure
- valve
- spring
- rams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- 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
- F15B2211/20507—Type of prime mover
- F15B2211/20523—Internal combustion engine
-
- 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
- F15B2211/3052—Shuttle 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- 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
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
-
- 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
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
- F15B2211/3127—Floating position connecting the working ports and the return line
-
- 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
- F15B2211/31588—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 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
- F15B2211/30—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
- F15B2211/60—Circuit components or control therefor
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
-
- 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
- F15B2211/7107—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being mechanically linked
-
- 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
- F15B2211/75—Control of speed of the 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
1297601 Hydraulic control system GENERAL SIGNAL CORP 3 May 1971 [14 May 1970] 12786/71 Heading F1P In an hydraulic system for, e.g., the boom of a front end loader, and including a pair of rams 12, 13 controlled by a 4-position distributing valve 16 having a 'float' position F in which it establishes a flow-path between head and rod ends of the ram cylinders, a by-pass valve 17 is actuated to form a second flow-path between the ends of the ram cylinders only when the pressure in the lower ends 12a, 13a of the rams is below a predetermined level and the distributing valve 16 is in the float position, thus preventing excessively fast collapsing of the rams 12, 13 if the float position is selected when a large load 11 is being supported. The distributing valve spool 23 is displaced to the raise R or power down PD positions against a centring spring 26 by fluid-pressure from a low-pressure pump 35 applied to either end of the valve 16 via a pilot valve 33 and lines 42, 43 in response to movement of the latter's spool 44 to the left or right respectively. Further movement of spool 44 to the right increases the pressure in line 43 by closing a small bleed notch 47 in spool 44 and this pressure moves the spool 23 to the F position against a second spring 29. Line 43 is connected, when the pressure in the lower ends 12a, 12b of the rams is below the predetermined level, via a valve 61 to the by-pass valve 17, to act on spool 55 against a spring 58, the increased pressure in line 43 required to move spool 23 to the F position also overcoming spring 58, thus providing a second path between the cylinder ends via notches 57 on spool 55. If the pressure in the lower ends of the rams 12, 13 is excessive, motor 63 moves valve 61 against spring 62 and thus prevents the pressure in line 43 acting on the spool 55. In a modification, Fig. 2 (not shown) bypass valve (17<SP>1</SP>) is directly connected to line 43, movement of the shuttle 55 to the left being resisted by the spring 58 and the pressure of fluid in space 54, which is connected via a spring- loaded shuttle valve (611) located in the bore of the spool 55 either to a drain, or, when the pressure in chamber 52 and applied to the shuttle valve, is sufficiently high to move the latter against its spring, to the chamber 52, in which case movement of the spool 55 is prevented.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3711470A | 1970-05-14 | 1970-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1297601A true GB1297601A (en) | 1972-11-29 |
Family
ID=21892503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1297601D Expired GB1297601A (en) | 1970-05-14 | 1971-05-03 |
Country Status (5)
Country | Link |
---|---|
US (1) | US3604313A (en) |
JP (1) | JPS564761B1 (en) |
FR (1) | FR2088558B1 (en) |
GB (1) | GB1297601A (en) |
SE (1) | SE372316B (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI57172C (en) * | 1970-05-21 | 1980-06-10 | Sulzer Ag | SAEKERHETSKOPPLING |
US3786827A (en) * | 1973-03-16 | 1974-01-22 | Caterpillar Tractor Co | Flow control valve |
US3987703A (en) * | 1974-08-12 | 1976-10-26 | Caterpillar Tractor Co. | Combined restrictor and dead engine lowering valve |
US3965587A (en) * | 1974-11-13 | 1976-06-29 | Clark Equipment Company | Quick drop control for scrapers |
US4015679A (en) * | 1975-05-16 | 1977-04-05 | J. I. Case Company | Drive range and lock control system |
US4359931A (en) * | 1981-01-19 | 1982-11-23 | The Warner & Swasey Company | Regenerative and anticavitation hydraulic system for an excavator |
JPS602164U (en) * | 1983-06-17 | 1985-01-09 | 松下電器産業株式会社 | combustion device |
US5251705A (en) * | 1992-03-19 | 1993-10-12 | Deere & Company | Electrical trigger for quick drop valve |
DE59305912D1 (en) * | 1993-02-02 | 1997-04-24 | Putzmeister Maschf | METHOD FOR CONVEYING PRE-CRUSHED METAL SCRAP OR THE SAME SOLID CONTAINING SOLIDS |
US6699311B2 (en) | 2001-12-28 | 2004-03-02 | Caterpillar Inc | Hydraulic quick drop circuit |
FR2863634A1 (en) * | 2003-12-16 | 2005-06-17 | Volvo Constr Equip Holding Se | Public works vehicle for ground leveling, has hydraulic jack freely moved when manipulator is in floating control position, when vehicle is in loading mode, and pressure reducing valve inactivating position, when vehicle is in lifting mode |
SE531309C2 (en) * | 2006-01-16 | 2009-02-17 | Volvo Constr Equip Ab | Control system for a working machine and method for controlling a hydraulic cylinder of a working machine |
KR101265342B1 (en) * | 2006-12-22 | 2013-05-20 | 두산인프라코어 주식회사 | Flat and slant improvement device of excavator |
US9340956B2 (en) | 2012-10-11 | 2016-05-17 | Cnh Industrial America Llc | Boom lock system for work machine |
US11053958B2 (en) * | 2019-03-19 | 2021-07-06 | Caterpillar Inc. | Regeneration valve for a hydraulic circuit |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3033168A (en) * | 1960-10-31 | 1962-05-08 | New York Air Brake Co | Hydraulic mechanism |
US3049101A (en) * | 1961-04-03 | 1962-08-14 | New York Air Brake Co | Hydraulic mechanism |
US3267961A (en) * | 1964-04-16 | 1966-08-23 | New York Air Brake Co | Valve |
US3335739A (en) * | 1964-12-03 | 1967-08-15 | New York Air Brake Co | Valve |
US3477347A (en) * | 1968-05-17 | 1969-11-11 | Gen Signal Corp | Hydraulic power circuit affording parallel regeneration paths |
-
1970
- 1970-05-14 US US37114A patent/US3604313A/en not_active Expired - Lifetime
-
1971
- 1971-05-03 GB GB1297601D patent/GB1297601A/en not_active Expired
- 1971-05-06 JP JP3013971A patent/JPS564761B1/ja active Pending
- 1971-05-07 SE SE7105969A patent/SE372316B/xx unknown
- 1971-05-12 FR FR7117184A patent/FR2088558B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2122454B2 (en) | 1976-11-25 |
FR2088558B1 (en) | 1975-06-06 |
FR2088558A1 (en) | 1972-01-07 |
SE372316B (en) | 1974-12-16 |
US3604313A (en) | 1971-09-14 |
DE2122454A1 (en) | 1971-11-18 |
JPS564761B1 (en) | 1981-01-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |