EP1548287A1 - Dispositif de commande en position d'un actionneur hydraulique et plaque interface de servovalve mettant en oeuvre un tel dispositif - Google Patents
Dispositif de commande en position d'un actionneur hydraulique et plaque interface de servovalve mettant en oeuvre un tel dispositif Download PDFInfo
- Publication number
- EP1548287A1 EP1548287A1 EP04292928A EP04292928A EP1548287A1 EP 1548287 A1 EP1548287 A1 EP 1548287A1 EP 04292928 A EP04292928 A EP 04292928A EP 04292928 A EP04292928 A EP 04292928A EP 1548287 A1 EP1548287 A1 EP 1548287A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- servovalve
- hydraulic
- actuator
- circuit
- chamber
- 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.)
- Granted
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 4
- 235000021183 entrée Nutrition 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0807—Manifolds
-
- 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
- F15B11/003—Systems with load-holding 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
- F15B2211/20—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
-
- 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
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/3051—Cross-check 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
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed 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
- F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
- F15B2211/315—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
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
-
- 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
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a 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
- F15B2211/40—Flow control
- F15B2211/46—Control of flow in the return line, i.e. meter-out control
-
- 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
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting 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
- F15B2211/70—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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/765—Control of position or angle 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
- F15B2211/88—Control measures for saving energy
Definitions
- the technical field of the invention is that of devices for controlling the position of a hydraulic actuator.
- These devices usually include a circuit hydraulic pump incorporating a pump (for example with displacement variable) which supplies one or the other of the two the actuator via a servovalve.
- the invention relates to a control device in position of a hydraulic actuator, device comprising a hydraulic circuit comprising a pump feeding from a tarpaulin or hydraulic reserve the two chambers of the actuator via a servovalve, each output channel of the servovalve being connected to a chamber of the actuator via a non-return valve, characterized in that at least one of the output channels of the servovalve which is connected to a actuator chamber is also connected to the tarpaulin hydraulic nozzle calibrated upstream of the valve valve.
- T connection is intended for back to the tarpaulin 5, the input connection P to the fluid supply from the pump 3, the output connections A and B being intended to connect the servovalve 4 to the two chambers 2a and 2b of the cylinder 2.
- the servovalve 4 is conventionally represented in FIG. 1 in its closed position (middle block 4c in the circuit) in which the four connections A, B, P and T are closed.
- the extreme positions 4a, 4b correspond to the flow rates maximum fluid delivered by the servovalve.
- the drawer can in a classic way occupy intermediate positions between the closed position and either of the two extreme positions. These intermediate positions correspond to different fluid flows transmitted according to one or the other of the control channels.
- valves 9a and 9b allow the holding in position of the cylinder 2 when it is controlled in an open loop or closed loop.
- a first nozzle 10a is connected by a pipe 11a to the pipe 8a and it drifts towards the tarpaulin 5 a part fluid flowing in it.
- the interface plate 13 is thus also produced under the shape of a parallelepipedic block of which one face lower 13a is intended to be applied on the face 12a of the servovalve.
- This face has four openings Ta, Aa, Ba and Pa destined to be next respectively openings T, A, B and P of the servovalve 4.
- each opening (Ta, Aa, Ba, Pa) the interface plate 13 has a counterbore which allows fit an O-ring. This seal will be applied during mounting against the face 12a of the servovalve and will ensure sealing.
- This variant makes it possible to accelerate in a preferential one of the movements of the cylinder.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Servomotors (AREA)
Abstract
Description
- la figure 1 est un schéma hydraulique simplifié d'un dispositif de commande selon l'invention,
- la figure 2 est un schéma simplifié de la plaque interface selon l'invention,
- les figures 3a, 3b et 3c sont trois vues d'un mode de réalisation d'une plaque interface, les figures 3a et 3b étant des coupes suivant respectivement les plans AA et BB visibles sur la figure 3c.
- une première (bloc de gauche 4a dans le circuit) dans laquelle la connexion d'entrée P est reliée à la connexion de sortie A tandis que l'autre sortie B est reliée à la bâche 5 via la connexion T,
- une seconde (bloc de droite 4b dans le circuit) dans laquelle la connexion d'entrée P est reliée à la connexion de sortie B tandis que l'autre sortie A est reliée à la bâche 5 via la connexion T.
Claims (7)
- Dispositif de commande (1) en position d'un actionneur hydraulique (2), dispositif comprenant un circuit hydraulique comprenant une pompe (3) alimentant à partir d'une bâche ou réserve hydraulique (5) les deux chambres (2a, 2b) de l'actionneur par l'intermédiaire d'une servovalve (4), chaque voie de sortie de la servovalve étant reliée à une chambre de l'actionneur par l'intermédiaire d'un clapet antiretour (9a, 9b), dispositif caractérisé en ce qu'au moins une des voies de sortie (8a, 8b) de la servovalve (4) qui est raccordée à une chambre (2a, 2b) de l'actionneur est également reliée à la bâche hydraulique (5) par un gicleur calibré (10a, 10b) en amont du clapet antiretour (9a, 9b).
- Dispositif de commande en position selon la revendication 1, dispositif caractérisé en ce qu'il comprend un gicleur calibré (10a, 10b) reliant chaque voie de sortie (8a, 8b) de la servovalve (4) à la bâche hydraulique (5).
- Plaque interface (13) de servovalve mise en oeuvre dans le dispositif selon une des revendications 1 ou 2, plaque comportant au moins quatre perçages transversaux (14, 15, 16, 17) destinés à coopérer avec les quatre ouvertures ou connexions hydrauliques (A, B, P, T) de la servovalve, c'est à dire une alimentation en fluide sous pression à partir d'une pompe (3), une sortie vers une bâche de réserve (5), une première voie de commande (8a) d'une première chambre (2a) de l'actionneur et une seconde voie de commande (8b) d'une seconde chambre (2b) de l'actionneur, plaque caractérisée en ce qu'elle comporte au moins un circuit de fuite (19a,19b) reliant une des voies de commande à la sortie bâche (5), circuit dans lequel est disposé un gicleur calibré (10a, 10b).
- Plaque interface de servovalve selon la revendication 3, plaque caractérisée en ce qu'elle comporte deux circuits de fuite (19a, 19b) comprenant un gicleur calibré (10a, 10b), chaque circuit reliant une des voies de commande à la sortie bâche (5).
- Plaque interface de servovalve selon une des revendications 3 ou 4, caractérisée en ce que le ou les circuits de fuite sont réalisés sous la forme de trous (19a1, 19a2, 19b1, 19b2, 19b3, 19b4) perpendiculaires les uns aux autres et perpendiculaires aux perçages transversaux (14, 15, 16) correspondants aux différentes voies.
- Plaque interface de servovalve selon la revendication 5, plaque caractérisée en ce que le débouché de chaque trou à l'extérieur de la plaque est obturé par un bouchon (20).
- Plaque interface de servovalve selon une des revendications 3 à 6, plaque caractérisée en ce que le ou les gicleurs (10a, 10b) sont réalisés sous la forme de vis comprenant un orifice axial calibré.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL04292928T PL1548287T3 (pl) | 2003-12-23 | 2004-12-09 | Urządzenie do sterowania położeniowego hydraulicznym mechanizmem wykonawczym i płyta sprzęgająca dla serwozaworu wykorzystującego takie urządzenie |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0315427 | 2003-12-23 | ||
| FR0315427A FR2864178B1 (fr) | 2003-12-23 | 2003-12-23 | Dispositif de commande en position d'un actionneur hydraulique et plaque interface de servovalve mettant en oeuvre un tel dispositif |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1548287A1 true EP1548287A1 (fr) | 2005-06-29 |
| EP1548287B1 EP1548287B1 (fr) | 2009-04-08 |
Family
ID=34531358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04292928A Expired - Lifetime EP1548287B1 (fr) | 2003-12-23 | 2004-12-09 | Dispositif de commande en position d'un actionneur hydraulique et plaque interface de servovalve mettant en oeuvre un tel dispositif |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20050132876A1 (fr) |
| EP (1) | EP1548287B1 (fr) |
| AT (1) | ATE428056T1 (fr) |
| DE (1) | DE602004020440D1 (fr) |
| ES (1) | ES2325395T3 (fr) |
| FR (1) | FR2864178B1 (fr) |
| PL (1) | PL1548287T3 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100096576A1 (en) * | 2008-10-22 | 2010-04-22 | Mark Sommer | Valve bleed system |
| CN102625882B (zh) * | 2009-07-16 | 2014-12-24 | 舍弗勒技术股份两合公司 | 液压系统 |
| US11274752B2 (en) * | 2020-01-08 | 2022-03-15 | Sun Hydraulics, Llc | Flow control valve with load-sense signal generation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2672731A (en) * | 1951-08-01 | 1954-03-23 | Electrol Inc | Self-contained power actuator |
| US3184920A (en) | 1963-06-12 | 1965-05-25 | Caterpillar Tractor Co | Leakage control for bulldozer pitch jack circuit |
| US4085657A (en) * | 1975-08-21 | 1978-04-25 | Societe Anonyme D.B.A. | Power steering mechanism |
| US4170279A (en) * | 1976-04-30 | 1979-10-09 | Societe Anonyme Potain Pioclain Materiel (P.P.M.) | Fluid flow control devices |
| JPS5947506A (ja) * | 1982-09-09 | 1984-03-17 | Fuji Eng Kk | 複合弁 |
| US20010042435A1 (en) * | 1999-08-19 | 2001-11-22 | Porter Don B. | Actuator having internal valve structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3543647A (en) * | 1969-05-02 | 1970-12-01 | Deere & Co | Control valve means for a two-way hydraulic cylinder |
| US4051764A (en) * | 1975-06-05 | 1977-10-04 | Hikaru Murata | Hydraulic actuating system |
-
2003
- 2003-12-23 FR FR0315427A patent/FR2864178B1/fr not_active Expired - Fee Related
-
2004
- 2004-07-23 US US10/896,931 patent/US20050132876A1/en not_active Abandoned
- 2004-12-09 PL PL04292928T patent/PL1548287T3/pl unknown
- 2004-12-09 AT AT04292928T patent/ATE428056T1/de not_active IP Right Cessation
- 2004-12-09 ES ES04292928T patent/ES2325395T3/es not_active Expired - Lifetime
- 2004-12-09 DE DE602004020440T patent/DE602004020440D1/de not_active Expired - Lifetime
- 2004-12-09 EP EP04292928A patent/EP1548287B1/fr not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2672731A (en) * | 1951-08-01 | 1954-03-23 | Electrol Inc | Self-contained power actuator |
| US3184920A (en) | 1963-06-12 | 1965-05-25 | Caterpillar Tractor Co | Leakage control for bulldozer pitch jack circuit |
| US4085657A (en) * | 1975-08-21 | 1978-04-25 | Societe Anonyme D.B.A. | Power steering mechanism |
| US4170279A (en) * | 1976-04-30 | 1979-10-09 | Societe Anonyme Potain Pioclain Materiel (P.P.M.) | Fluid flow control devices |
| JPS5947506A (ja) * | 1982-09-09 | 1984-03-17 | Fuji Eng Kk | 複合弁 |
| US20010042435A1 (en) * | 1999-08-19 | 2001-11-22 | Porter Don B. | Actuator having internal valve structure |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 0081, no. 52 (M - 309) 14 July 1984 (1984-07-14) * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2864178B1 (fr) | 2006-02-17 |
| US20050132876A1 (en) | 2005-06-23 |
| ATE428056T1 (de) | 2009-04-15 |
| EP1548287B1 (fr) | 2009-04-08 |
| ES2325395T3 (es) | 2009-09-03 |
| FR2864178A1 (fr) | 2005-06-24 |
| DE602004020440D1 (de) | 2009-05-20 |
| PL1548287T3 (pl) | 2009-09-30 |
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