EP0336887B1 - Pressure fluid servo amplifier - Google Patents

Pressure fluid servo amplifier Download PDF

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Publication number
EP0336887B1
EP0336887B1 EP89810182A EP89810182A EP0336887B1 EP 0336887 B1 EP0336887 B1 EP 0336887B1 EP 89810182 A EP89810182 A EP 89810182A EP 89810182 A EP89810182 A EP 89810182A EP 0336887 B1 EP0336887 B1 EP 0336887B1
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EP
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Prior art keywords
servo amplifier
thread
amplifier according
control shaft
control
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Expired - Lifetime
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EP89810182A
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German (de)
French (fr)
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EP0336887A1 (en
Inventor
Reinhold Huber
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Schweizerische Industrie Gesellschaft
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Schweizerische Industrie Gesellschaft
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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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/12—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which both the controlling element and the servomotor control the same member influencing a fluid passage and are connected to that member by means of a differential gearing

Definitions

  • a hydraulic servo amplifier according to the preamble of claim 1 is known from CH-A-658.302. It comprises a four-way sensor valve with a housing and a valve spool.
  • the output shaft of a motor is non-rotatably but axially slidably connected to an intermediate shaft. This passes through an axial bore of the control spool and is screwed at the other end with a threaded pin into a nut thread of a control shaft.
  • the control shaft is rotatable in the housing, but axially immovable. With a steep thread, it engages in a nut in a piston of an actuating cylinder. The control slide lies against a collar of the intermediate shaft.
  • This type of hydraulic servo amplifier has proven itself very well. However, the provision of such amplifiers for different piston strokes and piston diameters requires considerable storage effort.
  • the invention has for its object to develop a pressure medium servo amplifier of the type mentioned in such a way that it can be easily adapted to other conditions. This object is achieved by the characterizing features of claim 1.
  • the servo amplifier can be easily dismantled into its individual components, and one component can be exchanged for another with different characteristics.
  • the solution according to the invention thus makes it possible to provide the servo amplifier as a kit and to assemble it as required. This simplifies production and warehousing and increases flexibility in use. In particular, it is also possible to build a hydraulic or pneumatic servo amplifier using the same basic components.
  • the servo amplifier according to Fig. 1 is for hydraulics and compressed gas, e.g. Compressed air operation, suitable. It comprises a cylinder unit 1 with a cylinder 2 and a piston 3 and a piston rod 4 guided therein. Piston 3 and piston rod 4 form the output element of the servo amplifier.
  • a multi-edge sensor valve 8 is attached to a cylinder base 5. This consists of a valve housing 9 and a control spool 10.
  • the control spool 10 is displaceable in a bore 11 of the housing 9 running coaxially to the piston rod 4 and has a plurality of circumferential grooves 12 which together with the cylindrical outer surface of the control spool 10 form four control edges 13.
  • An axial deflection of the control spool 10 in the bore 11 opens a set of control edges 13, 14 from the pressure port P to the first outlet 16 of the valve 8 and from the second outlet 17 to the return T (or to the atmosphere in pneumatic applications).
  • the two outputs 16, 17 are connected to the two cylinder spaces 18, 19 of the cylinder unit 1.
  • the part 26 projecting into the hollow piston rod 4 has a steep thread 28 29 screwed in.
  • a cylindrical section 30 of the part 26 is sealingly guided through the cylinder base 5.
  • the part 27 has an external thread 31 with a substantially smaller pitch than the thread 28. With this thread 31, the part 27 is screwed into a nut 32 which is rotatable relative to the housing 9 but axially immovable.
  • the nut 32 has a circumferential toothing 33, in which a toothed belt 34 engages.
  • the toothed belt 34 also wraps around an output pinion 35 of a pilot motor 36.
  • the pilot motor 36 can e.g. be an electric stepper motor and is attached to the cylinder base 5 in the illustration according to FIG. 1.
  • the control slide 10 is pressed against the end of the control shaft 25 by a spring 20 and thus follows the axial movement of the control shaft 25.
  • the servo amplifier shown in FIG. 1 operates as follows: If the pinion 35 is rotated with the pilot motor 36, then the nut 32 also rotates. The engagement of the thread 31 in the nut 32 displaces the control shaft 25, whereby it moves simultaneously because of the engagement of the helical thread 28 in the nut 29 slightly twisted. This rotation acts in the exemplary embodiment shown, where the threads 28, 31 have the same pitch, in the sense of an enlargement of the displacement of the control shaft 25 caused by the rotary movement of the nut 32.
  • the control slide 10 follows the deflection of the control shaft 25 so that one cylinder chamber 18 has pressure medium supplied and the pressure medium is discharged from the other cylinder chamber 19. As a result, the piston 3 moves with the piston rod 4.
  • the described servo amplifier is versatile due to its construction and can therefore be used as a kit for a wide range of applications.
  • the sensor valve 8 is flanged as a separate unit and can be against another valve For example, with a larger valve diameter, a different characteristic, etc. can be replaced.
  • the control slide 10 unlike known servo amplifiers of this type, is not penetrated by an auxiliary shaft, it can be made smaller. Due to the two-part construction of the control shaft 25, the transmission ratio, ie the ratio of the piston stroke to the angle of rotation of the nut 32, can easily be changed. To do this, only the part 26 and the nut 29 need to be exchanged for a corresponding set with a different pitch.
  • Different cylinder units 1 can be attached to the unit consisting of sensor valve 8, pilot motor 36, nut 32 and part 27, each with part 26 matching the length and pitch of the thread.
  • the pilot motor 36 can also be exchanged very easily for another with different dynamics or different torque.
  • the structure described is therefore very well suited for a kit with which servo amplifiers can be put together for a wide variety of needs.
  • the pilot motor 36 is coaxially mounted on the end of the valve housing 9.
  • the nut 32 is here rigidly attached directly to the output shaft 37 of the pilot motor 36.
  • the part 26 of the control shaft 25 has an extension 41 which passes through an axial bore 21 of the control slide 10.
  • the control slide 10 is pressed by the spring 20 against a flange 42 of the extension 41 and is mounted thereon by means of an axial ball bearing 43.
  • the embodiment according to FIG. 2 has the same mode of operation and is slimmer than that according to FIG. 1 because the pilot motor 36 is not mounted on the side. However, this requires a thicker spool 10 and a longer length and is less flexible.
  • the embodiment according to FIG. 3 differs from that according to FIG. 2 by the type of output member, which here is the rotor 46 of a hydraulic or pneumatic rotary motor 47.
  • the nut 29 is rigidly connected to this rotor 46.
  • the angle of rotation of the rotor 46 is proportional to the angle of rotation of the output shaft 37.
  • the cylinder unit 1 can be replaced by a fluid motor in the manner shown in FIG. 3.
  • the threaded parts 26, 27 of the control shaft 25 can have threads with the same or opposite pitch.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)

Description

Ein hydraulischer Servoverstärker gemäss Oberbegriff des Anspruchs 1 ist aus der CH-A-658.302 bekannt. Er umfasst ein Vierkanten-Fühlerventil mit einem Gehäuse und einem Ventilschieber. Die Abtriebswelle eines Motors ist drehfest, aber axial verschiebbar mit einer Zwischenwelle verbunden. Diese durchgreift eine axiale Bohrung des Steuerschiebers und ist am andern Ende mit einem Gewindezapfen in ein Muttergewinde einer Steuerwelle eingeschraubt. Die Steuerwelle ist im Gehäuse drehbar, aber axial unverschiebbar gelagert. Mit einem Steilgewinde greift sie in eine Mutter in einem Kolben eines Betätigungszylinders ein. Der Steuerschieber liegt an einem Bund der Zwischenwelle an. Diese Bauart von hydraulischem Servoverstärker hat sich sehr bewährt. Allerdings erfordert das Bereitstellen solcher Verstärker für verschiedene Kolbenhübe und Kolbendurchmesser einen erheblichen Lageraufwand.A hydraulic servo amplifier according to the preamble of claim 1 is known from CH-A-658.302. It comprises a four-way sensor valve with a housing and a valve spool. The output shaft of a motor is non-rotatably but axially slidably connected to an intermediate shaft. This passes through an axial bore of the control spool and is screwed at the other end with a threaded pin into a nut thread of a control shaft. The control shaft is rotatable in the housing, but axially immovable. With a steep thread, it engages in a nut in a piston of an actuating cylinder. The control slide lies against a collar of the intermediate shaft. This type of hydraulic servo amplifier has proven itself very well. However, the provision of such amplifiers for different piston strokes and piston diameters requires considerable storage effort.

Der Erfindung liegt die Aufgabe zugrunde, einen Druckmittel-Servoverstärker der eingangs genannten Art derart weiterzubilden, dass er leicht anderen Bedingungen angepasst werden kann. Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The invention has for its object to develop a pressure medium servo amplifier of the type mentioned in such a way that it can be easily adapted to other conditions. This object is achieved by the characterizing features of claim 1.

Durch die erfindungsgemässe Lösung ist der Servoverstärker leicht in seine einzelnen Komponenten zerlegbar, und es kann eine Komponente gegen eine andere mit unterschiedlicher Charakteristik ausgetauscht werden. Die erfindungsgemässe Lösung ermöglicht es also, den Servoverstärker als Bausatz bereitzustellen und nach Bedarf zusammenzubauen. Dies vereinfacht die Herstellung und Lagerhaltung und vergrössert die Flexibilität in der Anwendung. Insbesondere ist es auch möglich, mit den gleichen Grundkomponenten einen hydraulischen oder einen pneumatischen Servoverstärker zu bauen.With the solution according to the invention, the servo amplifier can be easily dismantled into its individual components, and one component can be exchanged for another with different characteristics. The solution according to the invention thus makes it possible to provide the servo amplifier as a kit and to assemble it as required. This simplifies production and warehousing and increases flexibility in use. In particular, it is also possible to build a hydraulic or pneumatic servo amplifier using the same basic components.

Nachfolgend werden Ausführungsbeispiele der Erfindung anhand der Zeichnung erläutert. Darin zeigt:

  • Fig. 1 einen Axialschnitt durch eine erste Ausführungsform,
  • Fig. 2 einen Axialschnitt durch eine zweite Ausführungsform, und
  • Fig. 3 einen Axialschnitt durch eine dritte Ausführungsform.
Exemplary embodiments of the invention are explained below with reference to the drawing. It shows:
  • 1 shows an axial section through a first embodiment,
  • Fig. 2 is an axial section through a second embodiment, and
  • Fig. 3 shows an axial section through a third embodiment.

Der Servoverstärker nach Fig. 1 ist für Hydraulik und Druckgas, z.B. Druckluftbetrieb, geeignet. Er umfasst ein Zylinderaggregat 1 mit einem Zylinder 2 und einem darin geführten Kolben 3 und einer Kolbenstange 4. Kolben 3 und Kolbenstange 4 bilden das Abtriebsglied des Servoverstärkers. Am einen Zylinderboden 5 ist ein MehrkantenFühlerventil 8 befestigt. Dieses besteht aus einem Ventilgehäuse 9 und einem Steuerschieber 10. Der Steuerschieber 10 ist in einer koaxial zur Kolbenstange 4 verlaufenden Bohrung 11 des Gehäuses 9 verschiebbar und hat mehrere Umfangsnuten 12, die mit der zylindrischen Aussenfläche des Steuerschiebers 10 zusammen vier Steuerkanten 13 bilden. Diese wirken zusammen mit entsprechenden Steuerkanten 14 des Gehäuses 9, welche durch Umfangsnuten 15 und die Bohrung 11 gebildet werden. Eine axiale Auslenkung des Steuerschiebers 10 in der Bohrung 11 öffnet je einen Steuerkantensatz 13, 14 vom Druckanschluss P zum ersten Ausgang 16 des Ventils 8 und vom zweiten Ausgang 17 zum Rücklauf T (bzw. zur Atmosphäre bei pneumatischen Anwendungen). Die beiden Ausgänge 16, 17 sind mit den beiden Zylinderräumen 18, 19 des Zylinderaggregates 1 verbunden.The servo amplifier according to Fig. 1 is for hydraulics and compressed gas, e.g. Compressed air operation, suitable. It comprises a cylinder unit 1 with a cylinder 2 and a piston 3 and a piston rod 4 guided therein. Piston 3 and piston rod 4 form the output element of the servo amplifier. A multi-edge sensor valve 8 is attached to a cylinder base 5. This consists of a valve housing 9 and a control spool 10. The control spool 10 is displaceable in a bore 11 of the housing 9 running coaxially to the piston rod 4 and has a plurality of circumferential grooves 12 which together with the cylindrical outer surface of the control spool 10 form four control edges 13. These act together with corresponding control edges 14 of the housing 9, which are formed by circumferential grooves 15 and the bore 11. An axial deflection of the control spool 10 in the bore 11 opens a set of control edges 13, 14 from the pressure port P to the first outlet 16 of the valve 8 and from the second outlet 17 to the return T (or to the atmosphere in pneumatic applications). The two outputs 16, 17 are connected to the two cylinder spaces 18, 19 of the cylinder unit 1.

Zur Betätigung des Steuerschiebers 10 dient eine koaxial zur Kolbenstange 4 verlaufende Steuerwelle 25. Sie besteht aus zwei lösbar miteinander verbundenen Teilen 26, 27. Das in die hohle Kolbenstange 4 ragende Teil 26 hat ein Steilgewinde 28. Dieses ist in eine am Kolben 3 befestigte Mutter 29 eingeschraubt. Ein zylindrischer Abschnitt 30 des Teils 26 ist abdichtend durch den Zylinderboden 5 geführt. Das Teil 27 hat ein Aussengewinde 31 mit einer wesentlich geringeren Steigung als das Gewinde 28. Mit diesem Gewinde 31 ist das Teil 27 in eine gegenüber dem Gehäuse 9 drehbar, aber axial unverschiebbar gelagerte Mutter 32 eingeschraubt. Die Mutter 32 hat eine Umfangsverzahnung 33, in welche ein Zahnriemen 34 eingreift. Der Zahnriemen 34 umschlingt auch ein Abtriebsritzel 35 eines Pilotmotors 36. Der Pilotmotor 36 kann z.B. ein elektrischer Schrittmotor sein und ist in der Darstellung nach Fig. 1 am Zylinderboden 5 befestigt. Der Steuerschieber 10 ist durch eine Feder 20 stirnseitig an die Steuerwelle 25 gepresst und folgt somit der axialen Bewegung der Steuerwelle 25.A control shaft 25, which runs coaxially to the piston rod 4, is used to actuate the control slide 10. It consists of two parts 26, 27 which are detachably connected to one another. The part 26 projecting into the hollow piston rod 4 has a steep thread 28 29 screwed in. A cylindrical section 30 of the part 26 is sealingly guided through the cylinder base 5. The part 27 has an external thread 31 with a substantially smaller pitch than the thread 28. With this thread 31, the part 27 is screwed into a nut 32 which is rotatable relative to the housing 9 but axially immovable. The nut 32 has a circumferential toothing 33, in which a toothed belt 34 engages. The toothed belt 34 also wraps around an output pinion 35 of a pilot motor 36. The pilot motor 36 can e.g. be an electric stepper motor and is attached to the cylinder base 5 in the illustration according to FIG. 1. The control slide 10 is pressed against the end of the control shaft 25 by a spring 20 and thus follows the axial movement of the control shaft 25.

Im Betrieb arbeitet der in Fig. 1 dargestellte Servoverstärker wie folgt: Wird mit dem Pilotmotor 36 das Ritzel 35 gedreht, so verdreht sich auch die Mutter 32. Durch Eingriff des Gewindes 31 in der Mutter 32 verschiebt sich die Steuerwelle 25, wobei sie sich gleichzeitig wegen des Eingriffs des Steilgewindes 28 in der Mutter 29 etwas verdreht. Diese Verdrehung wirkt im dargestellten Ausführungsbeispiel, wo die Gewinde 28, 31 gleichsinnige Steigung haben, im Sinne einer Vergrösserung der durch die Drehbewegung der Mutter 32 bewirkten Verschiebung der Steuerwelle 25. Der Steuerschieber 10 folgt der Auslenkung der Steuerwelle 25, sodass dem einen Zylinderraum 18 Druckmittel zugeführt und das Druckmittel aus dem andern Zylinderraum 19 abgeführt wird. Dadurch verschiebt sich der Kolben 3 mit der Kolbenstange 4. Bei dieser Verschiebung verdreht die Mutter 29 durch Eingriff mit dem Steilgewinde 28 die Steuerwelle 25 in dem Sinne, dass sich die Steuerwelle durch Eingriff des Gewindes 31 in der Mutter 32 in die dargestellt Neutrallage zurückschraubt. Der Hub des Kolbens 3 folgt damit proportional dem Drehwinkel der Mutter 32, also dem durch den Pilotmotor 36 vorgegebenen Sollwert.In operation, the servo amplifier shown in FIG. 1 operates as follows: If the pinion 35 is rotated with the pilot motor 36, then the nut 32 also rotates. The engagement of the thread 31 in the nut 32 displaces the control shaft 25, whereby it moves simultaneously because of the engagement of the helical thread 28 in the nut 29 slightly twisted. This rotation acts in the exemplary embodiment shown, where the threads 28, 31 have the same pitch, in the sense of an enlargement of the displacement of the control shaft 25 caused by the rotary movement of the nut 32. The control slide 10 follows the deflection of the control shaft 25 so that one cylinder chamber 18 has pressure medium supplied and the pressure medium is discharged from the other cylinder chamber 19. As a result, the piston 3 moves with the piston rod 4. During this displacement, the nut 29 rotates the control shaft 25 by engagement with the steep thread 28 in the sense that the control shaft screwed back into the neutral position shown by engagement of the thread 31 in the nut 32. The stroke of the piston 3 thus follows proportionally to the angle of rotation of the nut 32, that is to say the setpoint specified by the pilot motor 36.

Der beschriebene Servoverstärker ist durch seinen Aufbau vielseitig abwandelbar und daher als Bausatz für ein breites Anwendungsgebiet einsetzbar. Das Fühlerventil 8 ist als separate Einheit angeflanscht und kann gegen ein anderes Ventil z.B. mit grösserem Schieberdurchmesser, anderer Kennlinie usw. ausgetauscht werden. Da der Steuerschieber 10, anders als bei bekannten derartigen Servoverstärkern, nicht durch eine Hilfswelle durchdrungen ist, kann er kleiner gebaut werden. Durch den zweiteiligen Aufbau der Steuerwelle 25 kann das Uebersetzungsverhältnis, d.h. das Verhältnis des Kolbenhubes zum Drehwinkel der Mutter 32 einfach geändert werden. Dazu braucht nur das Teil 26 und die Mutter 29 gegen einen entsprechenden Satz mit anderer Steigung ausgetauscht zu werden. An die Einheit bestehend aus Fühlerventil 8, Pilotmotor 36, Mutter 32 und Teil 27 können unterschiedliche Zylinderaggregate 1 mit jeweils in der Länge und in der Gewindesteigung passendem Teil 26 angebaut werden. Der Pilotmotor 36 kann auch sehr leicht gegen einen andern mit unterschiedlicher Dynamik oder anderem Drehmoment ausgetauscht werden. Der beschriebene Aufbau ist daher sehr gut für einen Bausatz geeignet, mit welchem sich Servoverstärker für die unterschiedlichsten Bedürfnisse zusammenstellen lassen.The described servo amplifier is versatile due to its construction and can therefore be used as a kit for a wide range of applications. The sensor valve 8 is flanged as a separate unit and can be against another valve For example, with a larger valve diameter, a different characteristic, etc. can be replaced. Since the control slide 10, unlike known servo amplifiers of this type, is not penetrated by an auxiliary shaft, it can be made smaller. Due to the two-part construction of the control shaft 25, the transmission ratio, ie the ratio of the piston stroke to the angle of rotation of the nut 32, can easily be changed. To do this, only the part 26 and the nut 29 need to be exchanged for a corresponding set with a different pitch. Different cylinder units 1 can be attached to the unit consisting of sensor valve 8, pilot motor 36, nut 32 and part 27, each with part 26 matching the length and pitch of the thread. The pilot motor 36 can also be exchanged very easily for another with different dynamics or different torque. The structure described is therefore very well suited for a kit with which servo amplifiers can be put together for a wide variety of needs.

Bei der Ausführungsform nach Fig. 2 ist der Pilotmotor 36 stirnseitig koaxial am Ventilgehäuse 9 angebaut. Die Mutter 32 ist hier direkt starr auf der Abtriebswelle 37 des Pilotmotors 36 befestigt. Das Teil 26 der Steuerwelle 25 hat eine Verlängerung 41, welche eine axiale Bohrung 21 des Steuerschiebers 10 durchgreift. Der Steuerschieber 10 wird durch die Feder 20 gegen einen Flansch 42 der Verlängerung 41 gepresst und ist auf dieser mittels eines Axialkugellagers 43 gelagert.In the embodiment according to FIG. 2, the pilot motor 36 is coaxially mounted on the end of the valve housing 9. The nut 32 is here rigidly attached directly to the output shaft 37 of the pilot motor 36. The part 26 of the control shaft 25 has an extension 41 which passes through an axial bore 21 of the control slide 10. The control slide 10 is pressed by the spring 20 against a flange 42 of the extension 41 and is mounted thereon by means of an axial ball bearing 43.

Die Ausführungsform nach Fig. 2 hat die gleiche Wirkungsweise und ist schlanker als jene nach Fig. 1, weil der Pilotmotor 36 nicht seitlich angebaut ist. Dies erfordert jedoch einen dickeren Steuerschieber 10 und eine grössere Baulänge und ist weniger flexibel.The embodiment according to FIG. 2 has the same mode of operation and is slimmer than that according to FIG. 1 because the pilot motor 36 is not mounted on the side. However, this requires a thicker spool 10 and a longer length and is less flexible.

Die Ausführungsform nach Fig. 3 unterscheidet sich von jener nach Fig. 2 durch die Art des Abtriebsgliedes, das hier der Rotor 46 eines Hydro- oder Pneumatik-Rotationsmotors 47 ist. Die Mutter 29 ist mit diesem Rotor 46 starr verbunden. Der Drehwinkel des Rotors 46 ist proportional zum Drehwinkel der Abtriebswelle 37. Auch bei der Ausführungsform nach Fig. 1 kann das Zylinderaggregat 1 in der in Fig. 3 dargestellten Weise durch einen Fluidmotor ersetzt werden.The embodiment according to FIG. 3 differs from that according to FIG. 2 by the type of output member, which here is the rotor 46 of a hydraulic or pneumatic rotary motor 47. The nut 29 is rigidly connected to this rotor 46. The angle of rotation of the rotor 46 is proportional to the angle of rotation of the output shaft 37. Also in the embodiment according to FIG. 1, the cylinder unit 1 can be replaced by a fluid motor in the manner shown in FIG. 3.

Die Gewindeteile 26, 27 der Steuerwelle 25 können Gewinde mit gleichlaufender oder mit entgegengesetzt gerichteter Steigung aufweisen.The threaded parts 26, 27 of the control shaft 25 can have threads with the same or opposite pitch.

Claims (9)

1. Pressure medium servo amplifier comprising a sensor valve (8) with several control edges, with a housing (9) and a control spool (10), a pilot motor (36) with a driven element (37) for actuating the sensor valve (8) by means of a helical gear (31, 32), and an output drive (1, 47) with an output drive housing (2) rigidly connected to the valve housing (9) and with a driven member (3, 4; 46), which is actuatable by a pressure medium controlled by the sensor valve (8), and comprising a control shaft (25), which has a first thread (28) screwed into the driven member (3, 4; 46) and a second thread (31) to introduce the movement of the driven element (37) of the pilot motor (36), characterised in that the control shaft (25) is mounted axially displaceably relative to the valve housing (9), in that the second thread (31) is in screw-engagement with a threaded element (32) which is mounted so as to be axially indisplace- able but rotatable relative to the valve housing (9), this threaded element (32) being connected non- rotatably to the driven element (37) of the pilot motor (36), and in that the control spool (10) follows the axial movement of the control shaft (25).
2. Servo amplifier according to claim 1, characterised in that the rotary threaded element is a nut (32) and the second thread (31) of the control shaft (25) is an external thread.
3. Servo amplifier according to claim 2, characterised in that the nut (32) is mounted between the control spool (10) and the first thread (28).
4. Servo amplifier according to claim 3, characterised in that the nut (32) is connected to the driven element (37) of the pilot motor (36) via a belt drive (34).
5. Servo amplifier according to one of claims 1 to 4, characterised in that the control shaft (25) consists of two parts (26, 27), which are detachably connected to one another so as to be exchangeable and each of which has one of the two threads (28, 31).
6. Servo amplifier according to claim 5, characterised in that the rotary threaded element (32) is detachably connected to the housing (9) so as to be exchangeable.
7. Servo amplifier according to one of claims 1 to 6, characterised in that the output drive (1, 47) comprising the driven member (3, 4; 46) is detachably fixed to the valve housing (9) so as to be exchangeable.
8. Servo amplifier according to one of claims 1 to 7, characterised in that the control spool (10) is pressed against the control shaft (25) by a spring (20).
9. Servo amplifier according to one of claims 1 to 8, characterised in that the first thread (28) is steeper than the second thread (31).
EP89810182A 1988-04-08 1989-03-09 Pressure fluid servo amplifier Expired - Lifetime EP0336887B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1304/88 1988-04-08
CH130488 1988-04-08

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EP0336887A1 EP0336887A1 (en) 1989-10-11
EP0336887B1 true EP0336887B1 (en) 1991-01-30

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DE (1) DE58900050D1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839258B (en) * 2009-03-18 2012-11-07 宋家骏 Servo hydraulic transmission mechanism
CN105298970A (en) * 2015-12-09 2016-02-03 山东科技大学 Electro-hydraulic valve control displacement module and using method thereof

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EP0336887A1 (en) 1989-10-11
DE58900050D1 (en) 1991-03-07

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