EP0578995B1 - Vérin rotatif pneumatique avec un couple de démarrage amélioré - Google Patents

Vérin rotatif pneumatique avec un couple de démarrage amélioré Download PDF

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Publication number
EP0578995B1
EP0578995B1 EP93109868A EP93109868A EP0578995B1 EP 0578995 B1 EP0578995 B1 EP 0578995B1 EP 93109868 A EP93109868 A EP 93109868A EP 93109868 A EP93109868 A EP 93109868A EP 0578995 B1 EP0578995 B1 EP 0578995B1
Authority
EP
European Patent Office
Prior art keywords
piston
main
chamber
additional
actuator
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
EP93109868A
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German (de)
English (en)
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EP0578995A1 (fr
Inventor
Luciano Migliori
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.)
Univer SpA
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Univer SpA
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Publication date
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Publication of EP0578995A1 publication Critical patent/EP0578995A1/fr
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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type

Definitions

  • the present invention relates to a pneumatic rotary actuator of the type comprising a hollow cylindrical body defining an elongated chamber inside which a double-acting piston member reciprocates; the piston member has a threaded central hole which engages with a thread shaft rotatably supported and axially protruding from one end of the actuator. Fluid under pressure alternately acts first on the sides of the piston member to cause a reciprocating movement and the consequent rotation of the thread shaft of the rotary actuator (see for example DE-A-29 19 435).
  • Pneumatic actuators with a rotating shaft are widely known and used on account of their operating features and their ability to provide high torques over the entire travel of the piston, with the possibility of stopping the latter at any desired point of the rotational arc of the output shaft which may reach and even exceed 360°.
  • Pneumatic rotary actuators are generally preferred to other types of actuators, for example to actuators of electrical type, whenever, for safety purposes or other reasons, operation under safety conditions is required.
  • the pneumatic rotary actuators currently known unlike electric actuators, provide a torque of constant value over the entire working travel, without the possibility of varying or increasing the said torque in a controlled manner.
  • the main scope of the present invention is to provide a pneumatic rotary actuator of the kind mentioned above, by means of which it is possible to obtain varying torque values, in particular a greater starting torque value in one or both the rotational directions of the actuator shaft or over a desired portion of the piston travel.
  • a further scope of the present invention is to provide a pneumatic rotary actuator of the abovementioned kind which has extremely small dimensions, for a same working travel and maximun torque value, and by means of which the reactive twisting moment which normally acts on the operating piston of the actuator can also be distributed over a large area; in this way it is possible to achieve smooth sliding of the piston, substantially without any reaction problems.
  • the actuator 10 comprises a hollow cylindrical body 11 consisting for example of a barrel axially extending and having a polygonal cross-section, and of two closing end-pieces 12 and 13.
  • the cylindrical body 11 is divided up into a main chamber 14 extending in the axial direction of the actuator, and into two lateral chambers 15, 16 of smaller length than the main chamber 14, which are separated from the main chamber 14 for example by internal partitions 17, 18 provided by the bottom wall of a corresponding cup-shaped elements defining the lateral chambers 15, 16; each cup-shaped member is sealingly inserted in the body 11 against suitable stop means provided by an annular shoulder inside the barrel and retained by the end-piece 12 and 13; tie-rods, not shown, pass through suitable holes in the end-pieces 12, 13 and are screwed into corresponding holes in the barrel 11 of the actuator, as for example indicated by 19 in Figure 3.
  • a main double-acting piston 20 having a polygonal cross-section corresponding to that of the body 11, the internal surfaces of which therefore define guide means preventing rotation of the piston 20.
  • the piston 20 is made from a material having a low friction and has an axial hole 20A which is internally provided with a threaded portion so as to engage with a thread shaft 21 of the actuator which is supported so as to rotate coaxially and emerging from one end of the body 10 of the actuator, passing through central openings 22 (only one is shown in Figure 1) in the partitions 17, 18 which separate the main chamber 14 from the lateral chambers 15 and 16; ports 23, 24 are provided in the end pieces 12 and 13 for sequentially supplying and discharging compressed air in the chambers of the actuator.
  • each lateral chamber 15, 16 there is provided a respective secondary single-acting piston 25, 26 having a tubular shaft extension 27, 28 sliding in a sealed manner through the central hole 22 of the partitions 17, 18 so as to extend through the same, towards and against the main piston 20 in such a way as to provide an additional thrusting action for an initial portion of the travel of the piston 20 at each end of chamber 14, in the manner described further below.
  • Rotating seals 35 are provided at both ends of the main piston 20 in such a way as to be adapted to the threading of the shaft 21 so that an adequate sealing action is provided between the two sides of the main chamber 14.
  • the pneumatic rotary actuator according to the invention is provided moreover with pneumatic damping means which act to brake the sliding movement of the piston 20 and hence rotation of the shaft 21 when piston 20 approaching the two ends of the travel of the piston itself.
  • the pneumatic damping means comprises substantially an adjustable needle valve 29 in each end-piece 12, 13 to connect chamber 14 to the exterior through a corresponding annular passage 23A, 24A supplying compressed air into the aforementioned chambers 14, 15 and 16.
  • the damping means on each side of the main piston 20, comprise a tubular element 30 axially extending around and spaced apart from the threaded shaft 21 and tubular shaft 27; the tubular element 30 protrudes from a plate 31 which is fixed, for example screwed to a corresponding end face of the piston 20.
  • the tubular element 30 has an internal diameter slightly greater than the maximum diameter of the shaft 21, and an external diameter slightly smaller than the internal diameter of the tubular extension 27, 28, respectively, of the two secondary pistons 25, 26 so as to provide the necessary passages for the fluid under pressure.
  • the tubular element 30 cooperates moreover with a lip seal 32 for the required sealing action with respect to the needle valve 29, necessary for obtaining the desired pneumatic damping effect.
  • FIG. 2 denotes venting holes for the chambers 15 and 16 on the side of the secondary piston which is opposite to the supplying side for the fluid under pressure, while 34 denotes radial holes in the tubular extensions 27 and 28 of the two lateral pistons, for allowing the passage of the fluid under pressure from the respective supply port 29, via the lip seal 32, to the fluid supply side of each lateral chamber 15, 16, along the annular duct formed between each tubular extension 27, 28 and the respective tubular element 30 of the pneumatic damping system, towards the corresponding side of the main chamber 14, through radial holes 34.
  • the thrusting action of the secondary piston 25 combined with that of the piston 20 will be exerted for a short portion of the travel of the piston 25, due to short length of chambers 14 and 15 i.e. for a length in any case sufficient to overcome the starting friction and provide a speed sufficient to start the movement of the load connected to the shaft 21.
  • the secondary piston 25 or the secondary piston 26, respectively have completed their forward travel, the movement of the central piston 20 is made to continue by the action alone of the air inside a respective side of the chamber 14; this thrust which is equal to half or in any case is less than the initial thrust is now more than sufficient to continue the sliding of piston 20 and the rotational movement of the shaft 21; in this way a considerably smaller amount of compressed air is requested.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)

Claims (5)

  1. Vérin pneumatique rotatif du type comportant un corps creux (11) définissant une chambre principale s'étendant axialement (14), un piston à double effet principal (20) pouvant effectuer des va-et-vient dans ladite chambre principale (14), ledit piston principal (20) comportant un trou axial intérieurement fileté (20A) pour le couplage avec un arbre fileté (21) supporté de façon à pouvoir tourner et s'étendant coaxialement à partir d'une extrémité dudit corps (11), caractérisé en ce qu'au moins une extrémité dudit vérin comprend des moyens formant pistons actionnés pneumatiquement additionnels (25, 26), chacun des moyens formant pistons additionnels (25, 26) agissant de façon à pousser vers l'avant le piston principal (20) sur une courte partie initiale de la course opérationnelle, et en ce que des moyens de guidage anti-rotation sont présents sur les surfaces en vis-à-vis du corps creux (11) et dudit piston principal (20) du vérin.
  2. Vérin pneumatique rotatif selon la revendication 1, caractérisé en ce que chaque côté de la chambre principale (14) et un côté correspondant d'une chambre de piston (15, 16) pour lesdits moyens formant pistons additionnels (25, 26) sont connectés au même orifice d'entrée pour un fluide sous pression par l'intermédiaire d'un passage annulaire s'étendant axialement autour de l'arbre fileté (21).
  3. Vérin pneumatique rotatif selon la revendication 1, caractérisé en ce que chacun des moyens formant pistons additionnels comporte une chambre de piston additionnelle (15, 16) alignée axialement avec ladite chambre principale (14) et ayant une longueur moindre que celle-ci, et en ce qu'un piston à simple effet secondaire (25, 26) peut se déplacer axialement à l'intérieur de ladite chambre additionnelle (15, 16), ledit piston secondaire (25, 26) comportant une extension tubulaire (27, 28) disposée coaxialement par rapport à l'arbre fileté (21), ladite extension tubulaire (27, 28) faisant saillie en direction dudit piston principal (20) à travers un trou central dans une cloison (17, 18) séparant la chambre principale (14) de ladite chambre additionnelle (15, 16) du vérin.
  4. Vérin pneumatique rotatif selon la revendication 1, caractérisé en ce que des moyens d'amortissement pneumatiques (29, 30) sont présents à chaque extrémité du piston principal (20) et de la chambre principale (14) du vérin.
  5. Vérin pneumatique rotatif selon la revendication 4, caractérisé en ce que lesdits moyens d'amortissement pneumatiques comprennent un élément tubulaire (30) s'étendant à partir de chaque extrémité du piston principal (20), ledit élément tubulaire (30) étant disposé axialement et espacé radialement de l'extension tubulaire (27, 28) des moyens formant pistons additionnels, et des moyens étanches à une extrémité du corps creux, encerclant respectivement ledit élément tubulaire (30) du piston principal (20), de façon à constituer un joint entre chaque chambre additionnelle (15, 16) et une vanne d'évacuation (29) connectée à un passage de délivrance d'air pour délivrer de l'air sous pression aux chambres de piston (14, 15, 16) du vérin.
EP93109868A 1992-06-26 1993-06-21 Vérin rotatif pneumatique avec un couple de démarrage amélioré Expired - Lifetime EP0578995B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI921576A IT1255184B (it) 1992-06-26 1992-06-26 Attuatore pneumatico rotativo con coppia di spunto maggiorata
ITMI921576 1992-06-26

Publications (2)

Publication Number Publication Date
EP0578995A1 EP0578995A1 (fr) 1994-01-19
EP0578995B1 true EP0578995B1 (fr) 1995-12-13

Family

ID=11363586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109868A Expired - Lifetime EP0578995B1 (fr) 1992-06-26 1993-06-21 Vérin rotatif pneumatique avec un couple de démarrage amélioré

Country Status (4)

Country Link
EP (1) EP0578995B1 (fr)
DE (1) DE69301012T2 (fr)
ES (1) ES2081164T3 (fr)
IT (1) IT1255184B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105179364A (zh) * 2015-09-21 2015-12-23 济南大学 一种防止活塞径向旋转、轴向移动的组合式连接装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543807B2 (fr) * 2011-07-06 2020-03-18 Isaf Bus Components S.r.l. Actionneur rotatif pour déplacer une porte battante pivotante, en particulier dans des véhicules

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970574A (en) * 1959-04-14 1961-02-07 Gen Motors Corp Dual piston hydraulic centering actuator
US2932206A (en) * 1959-05-14 1960-04-12 Gen Motors Corp Twin rotary actuator
DE2748955C2 (de) * 1977-11-02 1986-12-04 Walter Dipl.-Ing. 7758 Meersburg Holzer Pneumatischer oder hydraulischer Drehantrieb insbesondere für Schwenktüren
ATA387978A (de) * 1978-05-29 1982-08-15 Ife Gmbh Drehantrieb fuer tueren od.dgl.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105179364A (zh) * 2015-09-21 2015-12-23 济南大学 一种防止活塞径向旋转、轴向移动的组合式连接装置

Also Published As

Publication number Publication date
ES2081164T3 (es) 1996-02-16
EP0578995A1 (fr) 1994-01-19
IT1255184B (it) 1995-10-20
DE69301012D1 (de) 1996-01-25
DE69301012T2 (de) 1996-05-09
ITMI921576A0 (it) 1992-06-26
ITMI921576A1 (it) 1993-12-26

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