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EP0092480B1 - Hydraulic actuator - Google Patents

Hydraulic actuator Download PDF

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Publication number
EP0092480B1
EP0092480B1 EP83400756A EP83400756A EP0092480B1 EP 0092480 B1 EP0092480 B1 EP 0092480B1 EP 83400756 A EP83400756 A EP 83400756A EP 83400756 A EP83400756 A EP 83400756A EP 0092480 B1 EP0092480 B1 EP 0092480B1
Authority
EP
European Patent Office
Prior art keywords
jack
piston
pump
servo
cylinder
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
Application number
EP83400756A
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German (de)
French (fr)
Other versions
EP0092480A1 (en
Inventor
Jacques Henri Chatelin
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Individual
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Individual
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Filing date
Publication date
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Priority to AT83400756T priority Critical patent/ATE25132T1/en
Publication of EP0092480A1 publication Critical patent/EP0092480A1/en
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Publication of EP0092480B1 publication Critical patent/EP0092480B1/en
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    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/126—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators of the standard type with special circuit controlling means

Definitions

  • the invention relates to a hydraulic servo motor comprising a double-acting cylinder intended to be connected by its rod to a movable member to be moved and positioned with precision, this cylinder being completely filled with liquid, the displacement of the piston being carried out in a direction by the direct transfer of the liquid from one chamber to the other of the jack by an electric vibrator pump supplied from an alternating current source, while an electromagnetic member also supplied from the alternating current source is connected in parallel to the vibrator pump in order to reverse the direction of movement of the piston when this member is actuated.
  • a hydraulic step-by-step control arrangement which comprises a double-acting cylinder and the two chambers of which are each supplied by a vibrator pump from a fluid reservoir.
  • Each supply circuit of one of the cylinder chambers includes a device for returning to the reservoir, which is actuated each time the vibrator pump of the other chamber is energized.
  • a hydraulic control device which comprises two single-acting cylinders, each associated with a motor member constituted by a vibrator pump.
  • the pistons of the two cylinders are connected by means of a rod and a spring while non-return valves direct the fluid from one of the cylinders to the other when one or the other of the pumps vibrator is activated.
  • the presence of the spring does not ensure an exact correspondence of the two pistons of the cylinders, especially since in one of the cylinders, the surface for applying the pressure of the fluid on the piston is reduced due to the presence of the rod of this piston, while in the other cylinder, such a piston is not provided.
  • the object of the present invention is in particular to remedy these drawbacks and, in particular, to define the construction of a hydraulic servo-motor which provides direct servo-control to the orders coming from a process computer, without analog conversion or auxiliary device, this servo motor being of a great precision of displacement and positioning, while the reversal of the direction of displacement is instantaneous, without dead zone, in order to ensure the rigorous proportionality between the effect obtained and the command of order.
  • This servo motor is also designed so that it is moved to a safety position when there is a power cut.
  • the present invention is, for this purpose, characterized in that the cylinder is a double rod cylinder, while a spring is disposed between one end of the cylinder and the piston of the cylinder, in order to constantly tend to bring the piston towards a end of the cylinder, so that it opposes the pressure exerted by the vibrator pump, and in that a so-called safety solenoid valve, open at rest, is connected to communicate the two chambers of the jack when the supply from the AC power source is interrupted.
  • the servo motor comprises a double-acting cylinder 1 and double rod, the piston 2 being provided with two rods 3 1 , 3 2 of the same section which are intended to be connected to the organ to be enslaved.
  • the chambers 1 1 and 1 2 delimited by the piston 2 are of the same section, so as to obtain an identical displacement of the piston 2 in one direction or another for the same volume of fluid introduced through the end orifices 4 1 , 4 2 of the cylinder 1.
  • the vibrator pump 6, as well as the solenoid valve 8 are supplied from the AC voltage U of the sector by means of relays 9 1 , 9 2 , themselves controlled by the time pulses coming from a computer.
  • the solenoid valve 7 which is open when it is not energized, is supplied directly by the voltage U of the mains or other network and is therefore normally closed.
  • the vibrator pump 6 When the computer supplies a control pulse C + to relay 9 i , the vibrator pump 6 is energized, the vibrations of this pump being established for the duration of the control pulse C + and at a frequency corresponding to the frequency of the mains voltage.
  • the spring 11 disposed in the chamber 1 1 1 of the cylinder and acting on the piston 2, moves the piston in the opposite direction of the arrow F at a controlled rate by the section of the calibrated orifice 10.
  • the solenoid valve 8 has been replaced by a second vibrator pump 12 which is in head-to-tail position relative to the pump 6.
  • one of the two pumps 6 or 12 is supplied by the mains voltage U via the relays 9 1 or 9 2 , depending on the control pulse C + or C- coming from the computer.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Device For Special Equipments (AREA)
  • Servomotors (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Actuator (AREA)
  • Control Of Electric Motors In General (AREA)
  • Hydraulic Motors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Reciprocating Pumps (AREA)

Abstract

PCT No. PCT/FR83/00070 Sec. 371 Date Dec. 13, 1983 Sec. 102(e) Date Dec. 13, 1983 PCT Filed Apr. 18, 1983 PCT Pub. No. WO83/03643 PCT Pub. Date Oct. 27, 1983.(a) Hydraulic servo motor comprising a jack (1, 14) intended to be connected by its rod (31, 32, 151) to a moving member to be displaced and accurately positioned, said jack being completely filled with liquid; (b) Servo motor characterized in that the displacement of the piston (2) is implemented by direct liquid transfer from one chamber to the other chamber of the jack by at least one electric vibrator pump (6) supplied by an alternating current power source and in that a so-called electro valve (7), normally open when not in operation, is connected in order to make the two jack chambers communicate; (c) The invention relates to hydraulic servo motors.

Description

L'invention concerne un servo-moteur hydraulique comprenant un vérin à double effet destiné à être relié par sa tige à un organe mobile à déplacer et à positionner avec précision, ce vérin étant complètement rempli de liquide, le déplacement du piston étant réalisé dans un sens par le transfert direct du liquide d'une chambre à l'autre du vérin par une pompe électrique à vibreur alimentée à partir d'une source de courant alternatif, tandis qu'un organe électromagnétique alimenté également à partir de la source de courant alternatif est branché en parallèle sur la pompe à vibreur afin d'inverser le sens de déplacement du piston lorsque cet organe est actionné.The invention relates to a hydraulic servo motor comprising a double-acting cylinder intended to be connected by its rod to a movable member to be moved and positioned with precision, this cylinder being completely filled with liquid, the displacement of the piston being carried out in a direction by the direct transfer of the liquid from one chamber to the other of the jack by an electric vibrator pump supplied from an alternating current source, while an electromagnetic member also supplied from the alternating current source is connected in parallel to the vibrator pump in order to reverse the direction of movement of the piston when this member is actuated.

On connaît déjà, par la demande allemande N02117466, une disposition hydraulique de commande pas à pas qui comprend un vérin à double effet et dont les deux chambres sont alimentées chacune par une pompe à vibreur à partir d'un réservoir de fluide. Chaque circuit d'alimentation d'une des chambres du cylindre, comporte un dispositif de retour au réservoir, qui est actionnée à chaque fois que la pompe à vibreur de l'autre chambre est mise sous tension.Already known from German application N 0 2117466, a hydraulic step-by-step control arrangement which comprises a double-acting cylinder and the two chambers of which are each supplied by a vibrator pump from a fluid reservoir. Each supply circuit of one of the cylinder chambers includes a device for returning to the reservoir, which is actuated each time the vibrator pump of the other chamber is energized.

Suivant cette demande de brevet, il est donc prévu d'alimenter chaque chambre du vérin par des circuits indépendants, ce qui ne peut garantir une inversion du sens de déplacement de la tige du piston, qui est instantanée, c'est-à-dire sans zone morte, de façon à assurer la proportionnalité de l'effet obtenu par rapport à l'ordre de commande.According to this patent application, it is therefore planned to supply each chamber of the cylinder by independent circuits, which cannot guarantee an inversion of the direction of movement of the piston rod, which is instantaneous, that is to say without dead zone, so as to ensure the proportionality of the effect obtained compared to the order of order.

Egalement, dans la Revue « Product Licensing Index NO 82 de Février 1971 (page 33), on décrit un dispositif de commande hydraulique qui comprend deux vérins à simple effet, associés chacun à un organe moteur constitué par une pompe à vibreur. Les pistons des deux vérins sont reliés par l'intermédiaire d'une tige et d'un ressort tandis que des clapets anti-retour dirigent le fluide d'un des vérins à l'autre lorsque l'une ou l'autre des pompes à vibreur est actionnée.Also, in the review "Product Licensing Index NO 82 of February 1971 (page 33), a hydraulic control device is described which comprises two single-acting cylinders, each associated with a motor member constituted by a vibrator pump. The pistons of the two cylinders are connected by means of a rod and a spring while non-return valves direct the fluid from one of the cylinders to the other when one or the other of the pumps vibrator is activated.

Egalement, dans cette disposition, la présence du ressort ne permet pas d'assurer une correspondance exacte des deux pistons des cylindres, d'autant plus que dans l'un des cylindres, la surface d'application de la pression du fluide sur le piston est diminuée du fait de la présence de la tige de ce piston, alors que dans l'autre vérin, un tel piston n'est pas prévu.Also, in this arrangement, the presence of the spring does not ensure an exact correspondence of the two pistons of the cylinders, especially since in one of the cylinders, the surface for applying the pressure of the fluid on the piston is reduced due to the presence of the rod of this piston, while in the other cylinder, such a piston is not provided.

La présente invention a notamment pour but de remédier à ces inconvénients et, notamment, de définir la construction d'un servo-moteur hydraulique qui assure un asservissement direct aux ordres venant d'un calculateur de procédé, sans conversion analogique ni appareil annexe, ce servo-moteur étant d'une grande précision de déplacement et de positionnement, tandis que l'inversion du sens de déplacement est instantanée, sans zone morte, afin d'assurer la proportionnalité rigoureuse entre l'effet obtenu et l'ordre de commande. Ce servo-moteur est en outre réalisé de manière qu'il soit déplacé dans une position de sécurité lorsqu'il se produit une coupure de l'alimentation électrique.The object of the present invention is in particular to remedy these drawbacks and, in particular, to define the construction of a hydraulic servo-motor which provides direct servo-control to the orders coming from a process computer, without analog conversion or auxiliary device, this servo motor being of a great precision of displacement and positioning, while the reversal of the direction of displacement is instantaneous, without dead zone, in order to ensure the rigorous proportionality between the effect obtained and the command of order. This servo motor is also designed so that it is moved to a safety position when there is a power cut.

La présente invention est, à cet effet, caractérisée en ce que le vérin est un vérin à double tige, tandis qu'un ressort est disposé entre une extrémité du cylindre et le piston du vérin, afin de tendre constamment à ramener le piston vers une extrémité du cylindre, de façon qu'il s'oppose à la pression exercée par la pompe à vibreur, et en ce qu'une électrovanne dite de sécurité, ouverte au repos, est raccordée pour mettre en communication les deux chambres du vérin lorsque l'alimentation par la source de courant alternatif est interrompue.The present invention is, for this purpose, characterized in that the cylinder is a double rod cylinder, while a spring is disposed between one end of the cylinder and the piston of the cylinder, in order to constantly tend to bring the piston towards a end of the cylinder, so that it opposes the pressure exerted by the vibrator pump, and in that a so-called safety solenoid valve, open at rest, is connected to communicate the two chambers of the jack when the supply from the AC power source is interrupted.

L'invention est représentée, à titre d'exemple non limitatif, sur les dessins ci-joints, dans lesquels :

  • la figure 1 représente, de manière schématique, un servo-moteur conforme à l'invention pourvu d'une seule pompe vibrante et d'un vérin à double effet et à double tige ;
  • la figure 2 est une variante de la figure 1, le servo-moteur comportant deux pompes à vibreur ;

le servo-moteur conforme à l'invention s'appliquera au déplacement ou au positionnement précis et puissant de tout organe commandé, tel que des vannes de régulation, des outils de machines-outils, etc.The invention is shown, by way of non-limiting example, in the accompanying drawings, in which:
  • Figure 1 shows, schematically, a servo motor according to the invention provided with a single vibrating pump and a double-acting cylinder with double rod;
  • Figure 2 is a variant of Figure 1, the servo motor comprising two vibrator pumps;

the servo motor according to the invention will apply to the precise or powerful displacement or positioning of any controlled member, such as regulating valves, tools of machine tools, etc.

Suivant l'exemple de réalisation de la figure 1, le servo-moteur comprend un vérin 1 à double effet et double tige, le piston 2 étant pourvu de deux tiges 31, 32 de même section qui sont destinées à être reliées à l'organe à asservir.According to the embodiment of Figure 1, the servo motor comprises a double-acting cylinder 1 and double rod, the piston 2 being provided with two rods 3 1 , 3 2 of the same section which are intended to be connected to the organ to be enslaved.

Du fait des sections identiques des tiges 31 et 32, les chambres 11 et 12 délimitées par le piston 2 sont de même section, de façon à obtenir un déplacement identique du piston 2 dans un sens ou dans un autre pour un même volume de fluide introduit par les orifices d'extrémité 41, 42 du cylindre 1.Due to the identical sections of the rods 3 1 and 3 2 , the chambers 1 1 and 1 2 delimited by the piston 2 are of the same section, so as to obtain an identical displacement of the piston 2 in one direction or another for the same volume of fluid introduced through the end orifices 4 1 , 4 2 of the cylinder 1.

Ces orifices 41, 42 sont reliés par les conduits 5 d'un circuit hydraulique qui comprend en parallèle une pompe à vibreur 6, une électrovanne 7 à position ouverte hors tension et une électrovanne 8 à position fermée hors tension.These orifices 4 1 , 4 2 are connected by the conduits 5 of a hydraulic circuit which comprises in parallel a vibrator pump 6, a solenoid valve 7 in the open position with no voltage and a solenoid valve 8 with a closed position with no voltage.

La pompe à vibreur 6, ainsi que l'électrovanne 8 sont alimentées à partir de la tension alternative U du secteur par l'intermédiaire de relais 91, 92, eux-mêmes commandés par les impulsions de temps provenant d'un calculateur.The vibrator pump 6, as well as the solenoid valve 8 are supplied from the AC voltage U of the sector by means of relays 9 1 , 9 2 , themselves controlled by the time pulses coming from a computer.

Par contre, l'électrovanne 7 qui est ouverte lorsqu'elle n'est pas sous tension, est alimentée directement par la tension U du secteur ou autre réseau et est donc normalement fermée.On the other hand, the solenoid valve 7 which is open when it is not energized, is supplied directly by the voltage U of the mains or other network and is therefore normally closed.

Le fonctionnement de ce servo-moteur est le suivant :

  • Au repos, la pompe à vibreur 6 et l'électrovanne 8 ne sont pas alimentées, si bien que la pompe 6 ne débite pas dans le circuit 5, tandis que l'électrovanne 8 est fermée.
The operation of this servo motor is as follows:
  • At rest, the vibrator pump 6 and the solenoid valve 8 are not supplied, so that the pump 6 does not flow into the circuit 5, while the solenoid valve 8 is closed.

De même, l'électrovanne 7 étant sous tension, elle est également fermée.Similarly, the solenoid valve 7 being energized, it is also closed.

Lorsque le calculateur fournit une impulsion de commande C+ au relais 9i, la pompe à vibreur 6 est mise sous tension, les vibrations de cette pompe s'établissant pendant la durée de l'impulsion de commande C+ et à une fréquence correspondant à la fréquence de la tension secteur.When the computer supplies a control pulse C + to relay 9 i , the vibrator pump 6 is energized, the vibrations of this pump being established for the duration of the control pulse C + and at a frequency corresponding to the frequency of the mains voltage.

Le volume déplacé à chaque cycle de la pompe étant rigoureusement constant, on obtient ainsi un déplacement du piston 2 du cylindre qui est rigoureusement proportionnel à la durée de l'impulsion de commande C+.The volume displaced at each pump cycle being strictly constant, a displacement of the piston 2 of the cylinder is thus obtained which is strictly proportional to the duration of the control pulse C +.

Par contre, lorsque le relais 92 est excité par l'impulsion de commande C-, dans ce cas, la pompe 6 n'est plus alimentée mais l'électrovanne 8 est mise sous tension de façon à relier les deux orifices 41, 42 par l'intermédiaire d'un orifice calibré 10 constituant un limiteur de débit.On the other hand, when the relay 9 2 is energized by the control pulse C-, in this case, the pump 6 is no longer supplied but the solenoid valve 8 is energized so as to connect the two orifices 4 1 , 4 2 via a calibrated orifice 10 constituting a flow limiter.

Dans ce cas, le ressort 11, disposé dans la chambre 11 du cylindre 1 et agissant sur le piston 2, déplace ce piston dans le sens contraire de la flèche F à une vitesse réglée par la section de l'orifice calibré 10.In this case, the spring 11, disposed in the chamber 1 1 1 of the cylinder and acting on the piston 2, moves the piston in the opposite direction of the arrow F at a controlled rate by the section of the calibrated orifice 10.

Pour ce sens de déplacement du piston 2, on obtient donc également un déplacement linéaire rigoureusement proportionnel à la durée de l'impulsion C-, l'inversion du sens de déplacement se faisant en outre sans inertie et sans temps mort, du fait de la mise sous tension immédiate, soit de la pompe à vibreur 6, soit de l'électrovanne 8.For this direction of movement of the piston 2, a linear displacement is therefore also obtained which is strictly proportional to the duration of the pulse C-, the reversal of the direction of movement also taking place without inertia and without dead time, due to the immediate energization, either of the vibrator pump 6, or of the solenoid valve 8.

En outre, cet asservissement précis du piston 2 du vérin est assuré avec une consommation d'énergie minimum qui n'intervient que pendant les temps de commande de la pompe 6 ou de l'électrovanne 8, la position du piston étant maintenue en dehors de cette période de commande du fait de l'incompressibilité du liquide.In addition, this precise control of the piston 2 of the jack is ensured with a minimum energy consumption which occurs only during the control times of the pump 6 or of the solenoid valve 8, the position of the piston being maintained outside this order period due to the incompressibility of the liquid.

Lorsqu'il se produit une coupure de l'alimentation de la tension secteur U, l'alimentation de l'électrovanne 7 est interrompue et elle s'ouvre, ce qui a pour effet de mettre en communication les orifices 41 et 42 de façon que le ressort 11 déplace le piston 2 dans le sens contraire de la flèche F jusqu'à l'extrémité du cylindre 1, ce qui correspond à une position de sécurité de l'organe commandé.When there is a cut in the supply of the mains voltage U, the supply of the solenoid valve 7 is interrupted and it opens, which has the effect of communicating the orifices 4 1 and 4 2 of so that the spring 11 moves the piston 2 in the opposite direction of the arrow F to the end of the cylinder 1, which corresponds to a safety position of the controlled member.

Dans l'exemple de réalisation de la figure 2, l'électrovanne 8 a été remplacée par une seconde pompe à vibreur 12 qui est en position tête-bêche par rapport à la pompe 6.In the embodiment of FIG. 2, the solenoid valve 8 has been replaced by a second vibrator pump 12 which is in head-to-tail position relative to the pump 6.

Dans ce cas, l'une des deux pompes 6 ou 12 est alimentée par la tension secteur U par l'intermédiaire des relais 91 ou 92, en fonction de l'impulsion de commande C+ ou C- provenant du calculateur.In this case, one of the two pumps 6 or 12 is supplied by the mains voltage U via the relays 9 1 or 9 2 , depending on the control pulse C + or C- coming from the computer.

On obtient donc le même résultat que dans le cas de la figure 1, chacun des sens de déplace-. ment du piston 2 étant obtenu par l'une des deux pompes 6 ou 12.We therefore obtain the same result as in the case of FIG. 1, each of the directions of displacement. ment of the piston 2 being obtained by one of the two pumps 6 or 12.

Claims (4)

1. A hydraulic servo-motor, comprising a double-acting hydraulic jack (1) which is to be coupled by its rod (31, 3z) to a mobile member which is to be displaced and positioned with precision, said jack being completely filled with liquid, the displacement of the piston (2) being effected in one direction by the direct transfer of the liquid from one chamber of the jack to the other by means of an electric vibrator pump (6) which is supplied from an a. c. source, whilst an electromagnetic member (8, 12), also supplied from the a. c. source, is connected in parallel with the vibrator pump (6) so as to reverse the direction of displacement of the piston (2) when the electromagnetic member is actuated, characterised in that the jack (1) is a double rod jack ; that a spring (11) is arranged between one end of the cylinder and the piston (2) of the jack so as constantly to tend to return the piston (2) towards one end of the cylinder so that it opposes the pressure exerted by the vibrator pump (6) ; and that a magnetic valve, which is open when it is in the rest state, is connected to link together the two chambers of the jack when the a. c. supply is interrupted.
2. A servo-motor as claimed in Claim 1, characterised in that the electromagnetic reversal member (8) consists of a magnetic valve, said magnetic valve being closed when it is in the rest state.
3. A servo-motor as claimed in Claim 1, characterised in that the electromagnetic reversal member consists of a second vibrator pump (12) arranged alongside the first pump (6).
4. A servo-motor as claimed in Claim (2), characterised in that the magnetic reversal valve (8) is arranged in series with an outlet orifice (10) which has a calibrated diameter.
EP83400756A 1982-04-19 1983-04-18 Hydraulic actuator Expired EP0092480B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400756T ATE25132T1 (en) 1982-04-19 1983-04-18 HYDRAULIC ACTUATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8206683A FR2525292B1 (en) 1982-04-19 1982-04-19 HYDRAULIC SERVO-MOTOR
FR8206683 1982-04-19

Publications (2)

Publication Number Publication Date
EP0092480A1 EP0092480A1 (en) 1983-10-26
EP0092480B1 true EP0092480B1 (en) 1987-01-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400756A Expired EP0092480B1 (en) 1982-04-19 1983-04-18 Hydraulic actuator

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Country Link
US (1) US4642986A (en)
EP (1) EP0092480B1 (en)
JP (1) JPS59500575A (en)
AT (1) ATE25132T1 (en)
AU (1) AU559849B2 (en)
DE (1) DE3369368D1 (en)
DK (1) DK156310C (en)
FI (1) FI80332C (en)
FR (1) FR2525292B1 (en)
WO (1) WO1983003643A1 (en)

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CH563532A5 (en) * 1973-03-14 1975-06-30 Buehler Ag Geb
DE2500096C3 (en) * 1975-01-03 1984-08-02 Sauer Getriebe KG, 2350 Neumünster Hydraulic circuit device for pressure medium path control with constant control of the pressure medium flow for a double-acting hydraulic motor
US4416187A (en) * 1981-02-10 1983-11-22 Nystroem Per H G On-off valve fluid governed servosystem
US4437385A (en) * 1982-04-01 1984-03-20 Deere & Company Electrohydraulic valve system

Also Published As

Publication number Publication date
DK156310C (en) 1990-02-26
EP0092480A1 (en) 1983-10-26
FI80332C (en) 1990-05-10
FR2525292B1 (en) 1986-12-19
DK156310B (en) 1989-07-31
JPH0357324B2 (en) 1991-08-30
AU1470383A (en) 1983-11-04
FI834670A0 (en) 1983-12-19
WO1983003643A1 (en) 1983-10-27
AU559849B2 (en) 1987-03-19
FR2525292A1 (en) 1983-10-21
FI80332B (en) 1990-01-31
DK584783A (en) 1983-12-19
JPS59500575A (en) 1984-04-05
ATE25132T1 (en) 1987-02-15
FI834670L (en) 1983-12-19
DK584783D0 (en) 1983-12-19
DE3369368D1 (en) 1987-02-26
US4642986A (en) 1987-02-17

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