EP0032300A1 - Système de commande à fluide - Google Patents
Système de commande à fluide Download PDFInfo
- Publication number
- EP0032300A1 EP0032300A1 EP80304547A EP80304547A EP0032300A1 EP 0032300 A1 EP0032300 A1 EP 0032300A1 EP 80304547 A EP80304547 A EP 80304547A EP 80304547 A EP80304547 A EP 80304547A EP 0032300 A1 EP0032300 A1 EP 0032300A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- check valve
- pump
- cylinder
- fluid conduit
- 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.)
- Withdrawn
Links
Images
Classifications
-
- 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
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/005—With rotary or crank input
- F15B7/006—Rotary pump input
-
- 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
- F15B2211/20561—Type of pump reversible
Definitions
- This invention relates to a fluid system for controlling the operating functions of a motor device, such as an actuator.
- a motor device such as an actuator.
- the invention is concerned with the provision of an improved hydraulic system for controlling the operating functions of the movable member of an actuator, for example, the piston of a double acting cylinder and piston unit.
- An object of the invention is to provide a fluid control system which includes a bi-rotational pump connected with the opposite ends of the cylinder of an actuator device so as to move the piston therein in one or the other direction in the cylinder depending on the selected direction of rotation of the pump..
- a further more specific object of the invention is to provide valving in the fluid control circuits so as to prevent back pressure from the cylinder driving the pump in the event of the application of an outside force to the piston rod.
- a still further object of the invention is to provide means for avoiding a hydraulic lock situation in the event that the output pressure from the pump drops below the back pressure from the cylinder of the actuator device.
- the invention provides a fluid system for controlling the operation of an actuator consisting of a cylinder containing a piston movable therein, the opposite ends of said cylinder being connected each with an opposite output of a bi-directional pump through a one-way pressure check valve preventing return flow of fluid from said one cylinder end to said pump, said system being further characterised in that each end of said cylinder is furthermore connected to a fluid reservoir through a check valve which is normally open to permit flow of fluid from said cylinder end to said reservoir but which is adapted to close in response to a predetermined increase in pressure between the corresponding pump output and its one-way pressure check valve.
- piston rod R is slidably movable in a double acting cylinder B, the ends of which are provided with ports B 1 , B 2 for the connection thereto of the hydraulic control system of the invention.
- the piston rod R extends from one end of the cylinder B and is connected to a device to be actuated such as a valve.
- the hydraulic control system comprises a pump C which is a bi-directional rotary gear pump with a high leakage rate across the gears.
- the pump is preferably rotated manually, but may be motor driven.
- the port B 1 at one end of the cylinder B is connected with one output C 1 of the pump C by a hydraulic line which includes a normally closed one-way pressure check valve D 1 .
- the valve D 1 is a relatively high crack pressure check valve operable, for example, at a pressure of about 401bs. per square inch.
- the hydraulic line between the port B 1 and check valve D 1 may further include a flow control valve A 1 which is adjustable to vary
- the actuator is a double acting, hydraulically operated cylinder and piston unit and flow control valves may be located in the circuit lines to the cylinder so as to provide a speed control for the movement of the piston.
- a piston P having a draws fluid from the reservoir G through one-way check valve F 2 which now opens and pressure fluid is then pumped at the output C of the pump.
- the outlet pressure of the fluid from the pump C closes check valve F 1 to the reservoir G and when the pressure reaches approximately one half the crack pressure of the check valve D 1 , the pressure also communicated to valve E 1 closes the valve E 1 so isolating the corresponding end of cylinder B from the reservoir G.
- the valve D 1 opens at its rated pressure and the pressure then builds up in the corresponding right hand end of cylinder B. At this time fluid in the left hand end of cylinder B is able to travel freely from the cylinder via port B 2 to the reservoir G through the open check valve-E 2 so that the piston P will move to the left and retract the piston rod R.
- the system works in a similar manner to extend the piston rod R from the cylinder the speed of operation of the system, and the line is additionally connected to the reservoir G through a normally open pilot operated check valve E 1 .
- the hydraulic line between the pressure check valve D 1 and pump output C 1 is connected firstly, with the reservoir G through a one-way check valve F 1 ; and secondly, with the check valve B 1 on that side of the check valve remote from the reservoir.
- the hydraulic control system of the invention is completed by similar hydraulic connections and valves between the port B 2 at the other end of the cylinder B and the other outlet C 2 of the pump, the various valves being given the corresponding reference letters with the suscript 2.
- the hydraulic system as shown in Figure '1 is in an inoperative position.
- the pump has been manually operated to energize the pump C so that it rotates clockwise in the direction of the arrow.
- the pump C when the pump C is operated in the opposite anti-clockwise direction.
- Speed control of the system may be obtained by adjustment of the flow control valves A 1 and A 2 .
- the check valves D 1 , D 2 prevent the fluid from reaching the pump C and thereby driving it as a motor.
- Manual operation of the pump C in this situation could produce enough pressure in the pilot valve line to keep the pilot operated normally open check valves E 11 E 2 in a closed position thus causing a hydraulic lock.
- the control system of the invention avoids this problem due to the fact that upon cessation of manual operation of the pump handle, the pressure drop due to leakage across the pump is sufficiently high to cause an instantaneous opening of the pilot operated check valves E 1' E 2 so that a hydraulic lock is avoided.
- the one-way check valves D 1 and D 2 may be each combined as a single, unitary valve structure with its corresponding check valve E 1 and E 2 .
- the single valve structure may comprise a ported valve having a valve member which is slidably movable in response to the pump pressure firstly to isolate the reservoir drain line and secondly to open the line between the pump and the corresponding end of the cylinder.
- the actuator may be of the rotary vane type, the movable piston member in such an arrangement comprising a vane angularly movable in a quadrant-shaped cylinder through an arc of approximately 90°
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8001193 | 1980-01-14 | ||
GB8001193 | 1980-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0032300A1 true EP0032300A1 (fr) | 1981-07-22 |
Family
ID=10510622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80304547A Withdrawn EP0032300A1 (fr) | 1980-01-14 | 1980-12-17 | Système de commande à fluide |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0032300A1 (fr) |
JP (1) | JPS56101405A (fr) |
AU (1) | AU6596181A (fr) |
ZA (1) | ZA808017B (fr) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0291654A1 (fr) * | 1987-05-21 | 1988-11-23 | Ribaudo Vertical Systems Co. | Dispositif hydraulique pour ouvrir/fermer une porte |
US5107677A (en) * | 1987-05-21 | 1992-04-28 | Vertran Manufacturing Company | Hydraulic door actuator |
US5161957A (en) * | 1987-05-21 | 1992-11-10 | Vertran Manufacturing Company | Hydraulic door actuator |
FR2687206A1 (fr) * | 1992-02-12 | 1993-08-13 | Berruyer Jean Jacques | Dispositif de commande pour vannes. |
WO1996012108A1 (fr) * | 1994-10-13 | 1996-04-25 | Applied Power Inc. | Dispositif de commande hydraulique et boite de vitesses equipee de ce dispositif de commande |
EP0893605A1 (fr) * | 1997-07-23 | 1999-01-27 | HOERBIGER GmbH | Dispositif de commande hydraulique |
GB2422862A (en) * | 2005-02-03 | 2006-08-09 | Schlumberger Holdings | Apparatus for actuating downhole tools |
WO2008037307A1 (fr) * | 2006-09-25 | 2008-04-03 | Robert Bosch Gmbh | Transmission hydrostatique |
CN105545839A (zh) * | 2016-01-29 | 2016-05-04 | 贵阳海之力液压有限公司 | 一种油缸换向及容积调速液压系统 |
US9500206B2 (en) | 2013-11-18 | 2016-11-22 | Warner Electric Technology Llc | Fluid pump for a linear actuator |
EP2346467B1 (fr) * | 2008-09-24 | 2019-07-17 | Ekso Bionics, Inc. | Systèmes d'actionnement de hanche et de genou pour dispositifs orthétiques de membres inférieurs |
US10724553B2 (en) | 2018-12-06 | 2020-07-28 | Warner Electric Technology Llc | Three position metering valve for a self-contained electro-hydraulic actuator |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60101301A (ja) * | 1983-11-07 | 1985-06-05 | Mitsubishi Heavy Ind Ltd | シリンダの制動エネルギの再生装置 |
JP6247573B2 (ja) * | 2014-03-19 | 2017-12-13 | 株式会社ショーワ | 液圧アクチュエータ |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3877347A (en) * | 1973-03-13 | 1975-04-15 | Res Engineering Company | Hydraulic control |
-
1980
- 1980-12-17 EP EP80304547A patent/EP0032300A1/fr not_active Withdrawn
- 1980-12-22 ZA ZA00808017A patent/ZA808017B/xx unknown
-
1981
- 1981-01-05 AU AU65961/81A patent/AU6596181A/en not_active Abandoned
- 1981-01-09 JP JP256181A patent/JPS56101405A/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3877347A (en) * | 1973-03-13 | 1975-04-15 | Res Engineering Company | Hydraulic control |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0291654A1 (fr) * | 1987-05-21 | 1988-11-23 | Ribaudo Vertical Systems Co. | Dispositif hydraulique pour ouvrir/fermer une porte |
US5107677A (en) * | 1987-05-21 | 1992-04-28 | Vertran Manufacturing Company | Hydraulic door actuator |
US5161957A (en) * | 1987-05-21 | 1992-11-10 | Vertran Manufacturing Company | Hydraulic door actuator |
FR2687206A1 (fr) * | 1992-02-12 | 1993-08-13 | Berruyer Jean Jacques | Dispositif de commande pour vannes. |
US5857381A (en) * | 1994-10-13 | 1999-01-12 | Applied Power Inc. | Hydraulic operating device and gearbox provided with such an operating device |
NL9401692A (nl) * | 1994-10-13 | 1996-05-01 | Applied Power Inc | Hydraulische bedieningsinrichting en versnellingsbak voorzien van een dergelijke bedieningsinrichting. |
WO1996012108A1 (fr) * | 1994-10-13 | 1996-04-25 | Applied Power Inc. | Dispositif de commande hydraulique et boite de vitesses equipee de ce dispositif de commande |
EP0893605A1 (fr) * | 1997-07-23 | 1999-01-27 | HOERBIGER GmbH | Dispositif de commande hydraulique |
GB2422862A (en) * | 2005-02-03 | 2006-08-09 | Schlumberger Holdings | Apparatus for actuating downhole tools |
WO2008037307A1 (fr) * | 2006-09-25 | 2008-04-03 | Robert Bosch Gmbh | Transmission hydrostatique |
EP2346467B1 (fr) * | 2008-09-24 | 2019-07-17 | Ekso Bionics, Inc. | Systèmes d'actionnement de hanche et de genou pour dispositifs orthétiques de membres inférieurs |
US9500206B2 (en) | 2013-11-18 | 2016-11-22 | Warner Electric Technology Llc | Fluid pump for a linear actuator |
US10288064B2 (en) | 2013-11-18 | 2019-05-14 | Warner Electric Technology Llc | Fluid pump for a linear actuator |
CN105545839A (zh) * | 2016-01-29 | 2016-05-04 | 贵阳海之力液压有限公司 | 一种油缸换向及容积调速液压系统 |
US10724553B2 (en) | 2018-12-06 | 2020-07-28 | Warner Electric Technology Llc | Three position metering valve for a self-contained electro-hydraulic actuator |
Also Published As
Publication number | Publication date |
---|---|
AU6596181A (en) | 1981-07-23 |
JPS56101405A (en) | 1981-08-14 |
ZA808017B (en) | 1982-02-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19820627 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FRY, JEREMY JOSEPH Inventor name: WARNETT, CHRISTOPHER |