EP0336887B1 - Amplificateur asservi à fluide sous pression - Google Patents

Amplificateur asservi à fluide sous pression Download PDF

Info

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
Authority
EP
European Patent Office
Prior art keywords
servo amplifier
thread
amplifier according
control shaft
control
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 - Lifetime
Application number
EP89810182A
Other languages
German (de)
English (en)
Other versions
EP0336887A1 (fr
Inventor
Reinhold Huber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schweizerische Industrie Gesellschaft
Original Assignee
Schweizerische Industrie Gesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schweizerische Industrie Gesellschaft filed Critical Schweizerische Industrie Gesellschaft
Publication of EP0336887A1 publication Critical patent/EP0336887A1/fr
Application granted granted Critical
Publication of EP0336887B1 publication Critical patent/EP0336887B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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.

Landscapes

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

Claims (9)

1. Servo-amplificateur a fluide de pression, comprenant une valve détectrice à plusieurs arêtes (8) formee d'un boîtier (9) et d'un tiroir de distribution (10), un moteur pilote (36) comportant un organe de sortie (37) pour l'actionnement de la valve détectrice (8) au moyen d'une transmission à vis (31,32), un vérin (1; 47) comprenant un carter de vérin (2) fixé rigidement au boîtier de valve (9) et un élément de sortie (3, 4; 46) qui peut être actionné par un fluide de pression commandé par la valve détectrice (8), ainsi qu'un arbre de commande (25) qui présente un premier filetage (28) inséré par vissage dans l'élément de sortie (3, 4; 46) et un second filetage (31) pour la transmission du mouvement de l'organe de sortie (37) du moteur pilote (36), caractérisé en ce que l'arbre de commande (25) est monté mobile axialement par rapport au boîtier de valve (9), en ce que le second filetage (31) est en prise de vissage avec un élément fileté (32) qui est monté de façon à pouvoir tourner mais à ne pas pouvoir se déplacer axialement par rapport au boîtier de valve (9) et qui est solidaire en rotation de l'organe de sortie (37) du moteur pilote (36), et en ce que le tiroir de distribution (10) suit le mouvement axial de l'arbre de commande (25).
2. Servo-amplificateur selon la revendication 1, caractérisé en ce que l'élément fileté rotatif est un écrou (32) et en ce que le second filetage (31) de l'arbre de commande (25) est un filetage extérieur.
3. Servo-amplificateur selon la revendication 2, caractérisé en ce que l'écrou (32) est disposé entre le tiroir de distribution (10) et le premier filetage (28).
4. Servo-amplificateur selon la revendication 3, caractérise en ce que l'écrou (32) est relié à l'organe de sortie (37) du moteur pilote (36) au moyen d'une transmission à courroie (34).
5. Servo-amplificateur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'arbre de commande (25) se compose de deux parties (26, 27) qui sont accouplées de façon détachable et remplaçable et qui présentent chacune l'un des deux filetages (28, 31).
6. Servo-amplificateur selon la revendication 5, caractérisé en ce que l'élément fileté rotatif (32) est accouplé au boïtier (9) de façon détachable et remplaçable.
7. Servo-amplificateur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le vèrin (1, 47) contenant l'élément de sortie (3, 4; 46) est fixé au boîtier de valve (9) de façon détachable et remplaçable.
8. Servo-amplificateur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le tiroir de distribution (10) est pressé par un ressort (20) contre l'arbre de commande (25).
9. Servo-amplificateur selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le premier filetage (28) a un pas plus rapide que le second filetage (31).
EP89810182A 1988-04-08 1989-03-09 Amplificateur asservi à fluide sous pression Expired - Lifetime EP0336887B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0336887A1 EP0336887A1 (fr) 1989-10-11
EP0336887B1 true EP0336887B1 (fr) 1991-01-30

Family

ID=4207306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810182A Expired - Lifetime EP0336887B1 (fr) 1988-04-08 1989-03-09 Amplificateur asservi à fluide sous pression

Country Status (2)

Country Link
EP (1) EP0336887B1 (fr)
DE (1) DE58900050D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839258B (zh) * 2009-03-18 2012-11-07 宋家骏 一种伺服液压传动机构
CN105298970A (zh) * 2015-12-09 2016-02-03 山东科技大学 一种电液阀控位移模块及其使用方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19916366A1 (de) * 1999-04-13 2000-10-19 Zahnradfabrik Friedrichshafen Aktuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH658302A5 (en) * 1982-06-07 1986-10-31 Sig Schweiz Industrieges Linear intensifier

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555967A (en) * 1969-01-23 1971-01-19 Gen Electric Closed loop servoactuator
DE3342239A1 (de) * 1983-11-23 1985-05-30 Mannesmann Rexroth GmbH, 8770 Lohr Steuervorrichtung fuer einen hydraulisch beaufschlagten arbeitszylinder
DE3412352C1 (de) * 1984-04-03 1985-09-12 Mannesmann Rexroth GmbH, 8770 Lohr Steuervorrichtung für einen hydraulisch beaufschlagten Arbeitszylinder
CH665261A5 (en) * 1984-11-15 1988-04-29 Sig Schweiz Industrieges Hydraulic adjusting drive - has valve shaft coupling giving progressively increasing movement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH658302A5 (en) * 1982-06-07 1986-10-31 Sig Schweiz Industrieges Linear intensifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839258B (zh) * 2009-03-18 2012-11-07 宋家骏 一种伺服液压传动机构
CN105298970A (zh) * 2015-12-09 2016-02-03 山东科技大学 一种电液阀控位移模块及其使用方法

Also Published As

Publication number Publication date
EP0336887A1 (fr) 1989-10-11
DE58900050D1 (de) 1991-03-07

Similar Documents

Publication Publication Date Title
DE1957658C3 (de) Drehantrieb
EP0981696B1 (fr) Transmission a roue dentee excentrique
DE1553275C3 (de) Rotationskolbenmaschine für Flüssigkeiten
DE3912743C2 (de) Hydraulische Steuereinrichtung
DE2150392A1 (de) Regulierventil mit erleichtertem Stroemungsverlauf
EP0336887B1 (fr) Amplificateur asservi à fluide sous pression
DE4025113C2 (de) Vollhydraulische Lenkeinrichtung für Fahrzeuge
DE69934200T2 (de) Lastreaktive Lenkeinheit für Lenkzylinder mit ungleichen Flächen
DE2919051C2 (de) Hydrostatische Hilfskraftlenkung
DE69216050T2 (de) Flüssigkeitskolbenpumpe mit Servohubsteuerung
DE2365489A1 (de) Integrale servolenkung
DE1576142C3 (de) Hydraulisch oder pneumatisch betätig ter Drehantrieb
DE3428757A1 (de) Drehschieberventil
DE2107378A1 (de) Getriebe
CH657434A5 (en) Rolling-contact mechanism and the use of the latter
EP0886127B1 (fr) Dispositif de dosage pour produits visqueux
DE2806929C2 (de) Fluidbetätigter Servomotor mit Nachlaufsteuerung
DE3502506A1 (de) Ventilfernpositionierungseinrichtung
DE3900298A1 (de) Pneumatischer schwenkantrieb mit modifizierbarem kurvenstueck
DE102004029749A1 (de) Verfahren zur Herstellung eines Drehschiebersteuerventils für eine hydraulische Lenkeinrichtung
DE4207817C2 (de) Druckmittelbetriebener Drehantrieb
EP0949434B1 (fr) Transmission à vis
DE2526146A1 (de) Vorrichtung zur verteilung eines stroemungsmittelflusses in feststehenden proportionen
DE2020175C3 (de) Steuerventil für Servo-Lenkgetriebe
DE102004035094A1 (de) Servolenkung mit hydraulischer Momentüberlagerung

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

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19891108

17Q First examination report despatched

Effective date: 19900220

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910211

Year of fee payment: 3

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910228

Year of fee payment: 3

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 58900050

Country of ref document: DE

Date of ref document: 19910307

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910320

Year of fee payment: 3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19920331

Ref country code: CH

Effective date: 19920331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19921130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19921201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930309

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930309

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050309