EP0498918A1 - Vérin à fluide sous pression - Google Patents

Vérin à fluide sous pression Download PDF

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Publication number
EP0498918A1
EP0498918A1 EP91105106A EP91105106A EP0498918A1 EP 0498918 A1 EP0498918 A1 EP 0498918A1 EP 91105106 A EP91105106 A EP 91105106A EP 91105106 A EP91105106 A EP 91105106A EP 0498918 A1 EP0498918 A1 EP 0498918A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
housing
cylinder housing
outside
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.)
Withdrawn
Application number
EP91105106A
Other languages
German (de)
English (en)
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.)
Hygrama AG
Original Assignee
Hygrama AG
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 Hygrama AG filed Critical Hygrama AG
Publication of EP0498918A1 publication Critical patent/EP0498918A1/fr
Withdrawn legal-status Critical Current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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2884—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using sound, e.g. ultrasound

Definitions

  • the invention relates to a pressure cylinder.
  • Pressure medium cylinders which have a sealed housing, in the cylindrical interior of which a sealed piston is guided so as to be longitudinally displaceable.
  • the piston is driven by the pressure difference on its two faces.
  • the force can be taken either through a longitudinal slot on a bracket, or through the front of the housing with the help of a band.
  • a method for determining the position is known in which a high current pulse is generated in a sound waveguide from magnetostrictive material. This creates a circular magnetic field around the sound waveguide. If a magnetic field already exists at one point along the sound waveguide, the superposition of the two magnetic fields leads to a change in the crystal structure due to the magnetostriction and thus to an ultrasound pulse that continues in both directions. At one end, the ultrasonic pulse is absorbed in a damping section. At the other end of the sound waveguide, the time between the generation of the current pulse and the arrival of the ultrasound pulse is measured and the distance is determined therefrom.
  • the sound waveguide which is surrounded by a protective tube at a distance, to be surrounded by a ring which contains a plurality of radially running short bar magnets.
  • This ring which surrounds the sound waveguide on all sides, is used as a position transmitter.
  • the invention has for its object to provide a pressure medium cylinder in which the position can be determined exactly, without the positioning determining device in any way to restrict the possibility of attachment or the arrangement type of the cylinder.
  • the inventor of the present application has found that the use of a magnet within the cylinder housing is able to play the role of the position transmitter for the conductor element arranged outside the housing. So it is no longer necessary to enclose the conductor element by a ring element with four magnets, which would make a mechanical connection between the force-absorbing part of the piston and the position transmitter outside of the cylinder housing necessary.
  • the pressure medium cylinder proposed by the invention is therefore particularly suitable for achieving the object on which the invention is based. It does not contain any additional mechanical elements or connections on its outside for carrying out the measurement of the position. Lines are also no longer carried along with the piston, since all evaluation elements are arranged in a stationary manner at the front end of the conductor element.
  • the conductor element has a sound waveguide made of magnetostrictive material and the evaluation device has a pulse generator for generating a current pulse.
  • the sound waveguide is arranged in a protective tube surrounding it.
  • the invention proposes that the protective tube with the sound waveguide is attached directly to the outside of the cylindrical housing. This means that after a zero point is set for the first time, all subsequent adjustments are no longer necessary.
  • the attachment can, for example, advantageously take place in that the protective tube is arranged in a profile which is attached to the outside of the cylinder housing, in particular is hooked in, pushed in or latched into an existing groove. Such grooves are often already available for attaching the inventor's housing to fasteners.
  • FIG. 1 shows a greatly simplified top view of a rodless pressure medium cylinder.
  • the pressure medium cylinder contains a cylindrical housing 1, which is shown shortened in FIG. 1.
  • the housing 1 is made of aluminum, for example. It is on both faces completed by a closing element 2 each.
  • the closure elements 2 contain valves which are either arranged directly in the closure element 2 or can be screwed and fastened into openings provided there.
  • the valves serve to introduce pressure medium into the interior of the cylinder housing in order to control the movement of a piston.
  • the valves can usually be controlled by electrical lines.
  • the housing 1 contains a longitudinally extending slot, which is covered both on the outside and on the inside by a sealing tape 3, of which only the outer sealing tape 3 can be seen in FIG. 1.
  • the sealing tape 3 is made of steel, for example, so that it is held in place by magnets arranged on both sides of the longitudinal slot.
  • the housing 1 contains a circular cylindrical interior, in which a piston 4 is guided to be longitudinally displaceable.
  • the piston 4 is partially visible in FIG. 1.
  • the movement of the piston is controlled by the valves mentioned and the invention is concerned with determining the exact position of the piston.
  • the piston 4 contains a power take-off shoulder 5, on which the movement of the piston is removed and transmitted to a device to be driven.
  • a profile 6 is fastened, which extends in the longitudinal direction of the housing 1 over practically its entire length and has a nose-like rib 7 on the side.
  • the rib is shaped so that it fits into one of the arcuate grooves 8 provided on the outside of the housing 1. Due to the arc shape of the grooves 8, the profile can be inserted into the grooves 8 from the side insert and swivel up until the lower section 9 of the profile 6 has assumed the position shown in FIG. This can be fixed in that a screw is screwed through a threaded bore of section 9, which extends approximately radially to housing 1 and is supported on the outside thereof.
  • the profile 6 contains an interior 10 that is circular in cross section and extends in the longitudinal direction of the profile 6.
  • a protective tube (not shown in detail) for a measuring system is inserted into the interior 10, inside which a sound waveguide made of magnetostrictive material is arranged.
  • a housing 12 which is connected to the waveguide and the protective tube. All the devices required for determining the distance or the position of the piston are accommodated in the housing, including evaluation electronics.
  • the piston 4 contains two bar magnets 13, 14 which extend transversely to the longitudinal direction and, viewed in cross section, at an angle of 90 degrees with respect to the direction of the longitudinal slot. Both bar magnets 13, 14 contain pole-forming end faces 15, which are oriented so that the emerging magnetic lines are directed onto the profile 6 and thus onto the sound waveguide arranged therein.
  • the two bar magnets 13, 14, which run parallel to one another, have the opposite orientation, so that one pole directed towards the sound waveguide is a south pole and the other a north pole. This creates a magnetic circuit that closes through the sound waveguide. It would of course also be possible for the purpose of position measurement to use a horseshoe magnet instead of the two bar magnets.
  • the bar magnets 13, 14 have the advantage, however, that they can be used on the opposite outside of the housing 1 to operate magnetically operated switches.
  • the zero point is determined by moving the piston to a certain starting position and adjusting the device.
  • the exact position of the piston can then be determined in any position.
  • the outside of the piston contains no moving parts that interact with the position measuring system.
  • the entire outside of the housing is available, for example to provide the housing 1 with fastening parts and to fasten them.
  • the position transmitter the position of which is determined by the evaluation device, is formed by the magnets 13, 14 arranged in the inside of the housing in the piston 4, which magnets are actually already present for other purposes, namely for actuating magnetic switches.
EP91105106A 1991-02-15 1991-03-29 Vérin à fluide sous pression Withdrawn EP0498918A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9101734U 1991-02-15
DE9101734U DE9101734U1 (fr) 1991-02-15 1991-02-15

Publications (1)

Publication Number Publication Date
EP0498918A1 true EP0498918A1 (fr) 1992-08-19

Family

ID=6864298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105106A Withdrawn EP0498918A1 (fr) 1991-02-15 1991-03-29 Vérin à fluide sous pression

Country Status (3)

Country Link
EP (1) EP0498918A1 (fr)
JP (1) JPH06173910A (fr)
DE (1) DE9101734U1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829407A2 (fr) * 1996-09-13 1998-03-18 WABCO GmbH Vérin
US7624659B2 (en) * 2005-08-03 2009-12-01 Nissan Motor Co., Ltd. Shift position sensor of automated manual transmission
PL425179A1 (pl) * 2018-04-10 2019-10-21 Politechnika Łódzka Siłownik pneumatyczny
PL425178A1 (pl) * 2018-04-10 2019-10-21 Politechnika Łódzka Siłownik pneumatyczny

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4244204A1 (de) * 1992-12-24 1994-06-30 Bosch Gmbh Robert Wegmeßsystem für den Einfederweg eines Stoßdämpfers
DE4438164A1 (de) * 1994-10-26 1996-05-02 Festo Kg Antriebsvorrichtung
DE29508517U1 (de) * 1995-05-23 1995-08-10 Festo Kg Kolbenstangenloser Linearantrieb
DE19813371C2 (de) * 1998-03-26 2001-12-20 Festo Ag & Co Kolbenstangenloser Linearantrieb

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898555A (en) * 1973-12-19 1975-08-05 Tempo Instr Inc Linear distance measuring device using a moveable magnet interacting with a sonic waveguide
US4252176A (en) * 1978-10-26 1981-02-24 Nl Industries, Inc. Injection ram control
FR2546577A1 (fr) * 1983-05-28 1984-11-30 Festo Maschf Stoll G Unite piston-cylindre equipee d'un coulisseau magnetique servant de blocage de la position angulaire
DE8235659U1 (de) * 1982-12-18 1985-05-09 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Druckmittelbetätigbarer Arbeitszylinder
DE3644591A1 (de) * 1985-12-30 1987-07-02 Enfo Grundlagen Forschungs Ag Wegmesseinrichtung
GB2230385A (en) * 1989-04-08 1990-10-17 Festo Kg Control devices

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898555A (en) * 1973-12-19 1975-08-05 Tempo Instr Inc Linear distance measuring device using a moveable magnet interacting with a sonic waveguide
US4252176A (en) * 1978-10-26 1981-02-24 Nl Industries, Inc. Injection ram control
DE8235659U1 (de) * 1982-12-18 1985-05-09 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Druckmittelbetätigbarer Arbeitszylinder
FR2546577A1 (fr) * 1983-05-28 1984-11-30 Festo Maschf Stoll G Unite piston-cylindre equipee d'un coulisseau magnetique servant de blocage de la position angulaire
DE3644591A1 (de) * 1985-12-30 1987-07-02 Enfo Grundlagen Forschungs Ag Wegmesseinrichtung
GB2230385A (en) * 1989-04-08 1990-10-17 Festo Kg Control devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MACHINE DESIGN. vol. 57, no. 28, 21 November 1985, CLEVELAND US Seiten 79 - 83; "sonic position measurement" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0829407A2 (fr) * 1996-09-13 1998-03-18 WABCO GmbH Vérin
EP0829407A3 (fr) * 1996-09-13 2000-05-24 WABCO GmbH & Co. OHG Vérin
US7624659B2 (en) * 2005-08-03 2009-12-01 Nissan Motor Co., Ltd. Shift position sensor of automated manual transmission
PL425179A1 (pl) * 2018-04-10 2019-10-21 Politechnika Łódzka Siłownik pneumatyczny
PL425178A1 (pl) * 2018-04-10 2019-10-21 Politechnika Łódzka Siłownik pneumatyczny

Also Published As

Publication number Publication date
DE9101734U1 (fr) 1991-05-23
JPH06173910A (ja) 1994-06-21

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