EP0648942A1 - Lineares pneumatisches Stellorgan mit einer umorientierbaren Verriegelungseinrichtung - Google Patents

Lineares pneumatisches Stellorgan mit einer umorientierbaren Verriegelungseinrichtung Download PDF

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Publication number
EP0648942A1
EP0648942A1 EP94115580A EP94115580A EP0648942A1 EP 0648942 A1 EP0648942 A1 EP 0648942A1 EP 94115580 A EP94115580 A EP 94115580A EP 94115580 A EP94115580 A EP 94115580A EP 0648942 A1 EP0648942 A1 EP 0648942A1
Authority
EP
European Patent Office
Prior art keywords
piston
locking device
pneumatic
actuator
friction element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94115580A
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English (en)
French (fr)
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EP0648942B1 (de
Inventor
S.P.A. Univer
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
Application filed by Univer SpA filed Critical Univer SpA
Publication of EP0648942A1 publication Critical patent/EP0648942A1/de
Application granted granted Critical
Publication of EP0648942B1 publication Critical patent/EP0648942B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads
    • F15B15/264—Screw mechanisms attached to the piston
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B2015/1495—Characterised by the construction of the motor unit of the straight-cylinder type with screw mechanism attached to the piston

Definitions

  • the present invention relates to a linear pneumatic actuator and more precisely to an intelligent cylinder provided with a signal generator and a locking device by means of which it is possible to obtain precise control and an exact indication of the stroke of the piston, and in which the locking device is actuated by the same pressurized fluid so as to obtain a locking action which can be automatically controlled with extreme precision from the outside, using a single pneumatic energy source.
  • pneumatic actuators which not only are able to guarantee precise positioning control, but at the same time can also ensure rapid and safe blocking of the load, keeping it firmly in the desired position.
  • Intelligent pneumatic actuators comprising a piston movable in a reciprocating manner inside a cylinder have already been proposed, in which the piston is provided with a hollow rod which emerges from one end of the cylinder and in which a threaded shaft is arranged coaxially inside the hollow rod and engages with a threaded axial hole of the piston so as to rotate during the relative movement of the piston itself.
  • the threaded shaft is connected to a signal generator as well as to a locking device which can be pneumatically actuated so as to block or release rotation of the actuator's threaded shaft and, respectively, the linear movement of its piston; counteracting springs are provided in order to activate normally the device for effecting locking as a normally active brake or passive brake.
  • linear pneumatic actuators of the intelligent type provided with a locking device which can be actuated pneumatically
  • a locking device which can be actuated pneumatically
  • the document GB-A-2,154,282 describes a linear pneumatic actuator provided with a brake of the passive type, in which the locking force can be obtained both pneumatically and by the action of a spring so as to provide an adequate degree of safety in the event of a drop in the air pressure in the pneumatic circuit which supplies the actuator.
  • the document EP-A-469253 in turn describes an intelligent linear actuator provided with a special locking device controlled centrifugally.
  • the pneumatic actuator is provided with a passive brake in which springs normally press against the locking device so as to prevent rotation of the threaded shaft.
  • the actuator is provided with a locking device of the active type, in which friction members of the locking device are kept normally disengaged by the thrusting action of a spring so as to allow rotation of the threaded shaft and the reciprocating movement of the piston.
  • a linear actuator comprising an intelligent cylinder and a locking device which can be universally used and which can be easily adapted so as to operate with an active or passive brake, while keeping the structure and general features of the entire actuator substantially unaltered.
  • the scope of the present invention is to provide a linear pneumatic actuator which is provided with a reversible locking device capable, that is, of operating as an active brake or as an passive brake without having to modify the locking device itself, while ensuring a high degree of operative reliability, a safe locking action and precise positional control.
  • Yet another scope of the present invention is to provide a linear pneumatic actuator, as referred to above, made using standardised components, in which the active or passive action of the locking device can be preset during assembly; in this way it possible to standardise the entire production of the actuator, intervening as required only during assembly in order to modify operation of the locking device according to requirements and needs.
  • a universally utilisable linear pneumatic actuator is provided, which can be manufactured at an extremely low cost and is extremely versatile.
  • the actuator comprises a pneumatic cylinder 10 with end-pieces 11 and 12.
  • a piston 13 is arranged inside the cylinder 10 so as to be able to move in a reciprocating manner with respect to the latter under the thrust of a pressurised fluid, for example pressurised air which can be supplied through a port 14 in the front end-piece 11 and a port 15 provided in the internal end-piece 12 closing the cylinder chamber.
  • the tubular body of the cylinder 10 is extended at the rear by a part 10' closed by a rear end-piece 16 for accommodating a locking device and signal generator, described below.
  • the front end-piece 11 of the cylinder is provided with an axial hole 17 through which a hollow rod 18 extending axially forwards from the piston 13 passes and slides.
  • the rod 18 of the piston is supported in an axially slidable manner by the front end-piece 11 and the piston 13 is prevented from rotating by suitable guide means inside the cylinder 10, for example by shaping the cylinder 10 so as to have a polygonal cross-section.
  • the tubular rod 18 in the totally retracted condition of the piston 13 projects partially from the front end-piece 11 and is provided with a threaded front part 19 for connection to an external member or load.
  • the piston 13 has an axial hole, namely the tubular rod 18 extends through the piston so as to allow the passage of a threaded shaft 20 which extends forwards inside the tubular rod 18; the threaded shaft 20 engages with an internally threaded cylindrical sleeve 21 fixed inside the axial hole or inside the rod 18 of the piston so as to cause rotation of the rod itself by means of the reciprocating movement of the piston.
  • the threaded shaft 18 at its front end is therefore rotatably supported inside the hollow rod 18 by means of a bush 22 or in another suitable manner.
  • the threaded shaft 20 extends behind the piston and is connected to a pilot shaft 23 in turn connected, by means of a coupling 24, to an electric signal generator or encoder 25 accommodated in the front end-piece 16 of the actuator.
  • the pilot shaft 23, and consequently the threaded shaft 20, is rotatably supported by means of a bearing 26 accommodated in the body of the internal end-piece 12 closing the cylinder chamber; the pilot shaft, moreover, passes through the body of an internal cylindrical cartridge 27 inside which there is a reversible-action pneumatic locking device, shown in the enlarged detail of Figure 2.
  • the threaded sleeve 21 inside the piston 13 therefore engages operationally with the threaded shaft 20 such that the reciprocating linear movement of the said piston is translated into a corresponding alternating rotational movement of the threaded shaft 20, pilot shaft 23 and signal generator 25.
  • the rear end 28 of the threaded shaft 20 has a smaller diameter which extends into a cup-shaped cavity 29 of the pilot shaft 23.
  • the pilot shaft 23 has a middle portion 30 for supporting respectively the bearing 26, and a friction disc of the locking device described below.
  • the pilot shaft 23 has a rear part 31 with a smaller diameter which extends, freely rotatably, through the axial hole of a cylindrical shank 32 connected between a first piston element 34 sliding inside a pneumatic chamber 35 and a second piston element 36 movable inside a chamber 37.
  • the two pistons 34 and 36 are movable axially, being guided during their short stroke by the tubular stem 32, while they are prevented from rotating by means of a pin 38 which from the internal tubular body 27 extends partially into a hole 39 in the piston 34.
  • the first piston 34 is in the form of a cup-shaped element inside which there is accommodated a first friction element 40 intended to come into contact with the front surface of a second friction element 41 suitably fixed to the pilot shaft 23, for example by means of one or more dowels 42 or in another suitable manner.
  • a first friction element 40 intended to come into contact with the front surface of a second friction element 41 suitably fixed to the pilot shaft 23, for example by means of one or more dowels 42 or in another suitable manner.
  • the cup-shaped element of the piston 34 is provided with an annular seat for accommodating a sealing gasket 43.
  • the friction element 40 is made of elastomeric material with a high Shore hardness degree, for example between 85 and 95.
  • the other friction element 41 may be made of a suitable metallic alloy and may have its front surface designed to come into contact with the friction element 40, suitably toothed in order to improve the braking and locking action of the actuator.
  • the locking device can be preset, during assembly of the actuator, for selective supplying of pressurised air to one or other of the chambers 35 and 37 so as to provide thrusting actions which are reversible or in directions opposite to one another.
  • a hole 46 of an inlet aperture which is able to communicate selectively with the chambers 35, 37 of the locking device via a branched duct 47 which on one side leads into an annular chamber 48 communicating with the first chamber 35, while on the other it leads directly into the second chamber 37 as shown.
  • the branched duct 47 is internally threaded so as to allow the application of a plug 49 by means of which the supply to one or other of the two chambers is selected during assembly of the actuator.
  • Figure 2 shows an actuator with a passive brake, that is to say which remains constantly in the locking condition when there is no pressurized air inside the chamber 37 of the piston 36. Therefore, in this case, the annular chamber 48 has arranged inside it cup springs 50 which act in opposition to the piston 36 in order to push and keep the first friction element 40 against and constantly engaged with the second friction element 41.
  • the springs 50 should be eliminated and replaced with weaker springs 51 inside the chamber 37 of the second piston, as illustrated in broken lines in Figure 2.
  • the position of the plug 49 must be reversed during assembly, with respect to that shown, so as to allow the supply of air only towards the annular chamber 48 and the chamber 35 of the first piston 34 which accommodates the friction element 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)
  • Lock And Its Accessories (AREA)
EP94115580A 1993-10-06 1994-10-04 Lineares pneumatisches Stellorgan mit einer umorientierbaren Verriegelungseinrichtung Expired - Lifetime EP0648942B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI932123A IT1271509B (it) 1993-10-06 1993-10-06 Attuatore pneumatico lineare con freno ad azione reversibile
ITMI932123 1993-10-06

Publications (2)

Publication Number Publication Date
EP0648942A1 true EP0648942A1 (de) 1995-04-19
EP0648942B1 EP0648942B1 (de) 1998-07-22

Family

ID=11366988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94115580A Expired - Lifetime EP0648942B1 (de) 1993-10-06 1994-10-04 Lineares pneumatisches Stellorgan mit einer umorientierbaren Verriegelungseinrichtung

Country Status (5)

Country Link
EP (1) EP0648942B1 (de)
AT (1) ATE168744T1 (de)
DE (1) DE69411843T2 (de)
ES (1) ES2119039T3 (de)
IT (1) IT1271509B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20011789U1 (de) * 2000-07-06 2000-12-21 Bümach Engineering International B.V., Emmen Druckmittelbetriebener Arbeitszylinder mit mechanischer Wegsperrung im drucklosen Zustand
EP1777432A1 (de) * 2005-10-19 2007-04-25 UNIVER S.p.A. Bremse für rotierende Welle
WO2013124213A1 (de) * 2012-02-23 2013-08-29 Siemens Aktiengesellschaft Bremsanordnung eines fahrzeugs
US20170151767A1 (en) * 2015-11-30 2017-06-01 Vivid Laminating Technologies Ltd Pneumatic Positioning of Flatbed Laminator Roller
CN107592838A (zh) * 2015-05-15 2018-01-16 维维德层压技术有限公司 覆膜机辊的气动定位
CN108533563A (zh) * 2018-05-10 2018-09-14 四川大学 一种基于滚珠丝杠的外置摩擦机械自锁液压缸

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2009850A (en) * 1977-11-28 1979-06-20 Schweizerische Lokomotiv Self-locking hydraulic actuators
GB2154282A (en) * 1984-02-14 1985-09-04 H C H Manufacturing Ltd Fluid pressure actuators
US4932311A (en) * 1987-12-29 1990-06-12 Daihatsu Diesel Mfg. Co., Ltd. Fluid apparatus
EP0469253A1 (de) * 1990-07-30 1992-02-05 UNIVER S.p.A. Flüssigkeitsstellantrieb mit Programmsteuerung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2009850A (en) * 1977-11-28 1979-06-20 Schweizerische Lokomotiv Self-locking hydraulic actuators
GB2154282A (en) * 1984-02-14 1985-09-04 H C H Manufacturing Ltd Fluid pressure actuators
US4932311A (en) * 1987-12-29 1990-06-12 Daihatsu Diesel Mfg. Co., Ltd. Fluid apparatus
EP0469253A1 (de) * 1990-07-30 1992-02-05 UNIVER S.p.A. Flüssigkeitsstellantrieb mit Programmsteuerung

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20011789U1 (de) * 2000-07-06 2000-12-21 Bümach Engineering International B.V., Emmen Druckmittelbetriebener Arbeitszylinder mit mechanischer Wegsperrung im drucklosen Zustand
EP1170512A1 (de) * 2000-07-06 2002-01-09 Bümach Engineering International B.V. Druckmittelbetriebener Arbeitszylinder mit mechanischer Wegsperrung im drucklosen Zustand
EP1777432A1 (de) * 2005-10-19 2007-04-25 UNIVER S.p.A. Bremse für rotierende Welle
US7836813B2 (en) 2005-10-19 2010-11-23 Univer S.P.A. Self-locking braking device for rotary shafts, and relevant applications
WO2013124213A1 (de) * 2012-02-23 2013-08-29 Siemens Aktiengesellschaft Bremsanordnung eines fahrzeugs
CN107592838A (zh) * 2015-05-15 2018-01-16 维维德层压技术有限公司 覆膜机辊的气动定位
US20180134021A1 (en) * 2015-05-15 2018-05-17 Vivid Laminating Technologies Limited Pneumatic positioning of laminator rollers
US20170151767A1 (en) * 2015-11-30 2017-06-01 Vivid Laminating Technologies Ltd Pneumatic Positioning of Flatbed Laminator Roller
CN106808778A (zh) * 2015-11-30 2017-06-09 维维德层压技术有限公司 平板覆膜机辊的气动定位
CN108533563A (zh) * 2018-05-10 2018-09-14 四川大学 一种基于滚珠丝杠的外置摩擦机械自锁液压缸

Also Published As

Publication number Publication date
ES2119039T3 (es) 1998-10-01
IT1271509B (it) 1997-05-30
ITMI932123A0 (it) 1993-10-06
ATE168744T1 (de) 1998-08-15
DE69411843T2 (de) 1998-12-10
ITMI932123A1 (it) 1995-04-06
EP0648942B1 (de) 1998-07-22
DE69411843D1 (de) 1998-08-27

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