EP0509117B1 - Vérin à fluide sous pression - Google Patents

Vérin à fluide sous pression Download PDF

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Publication number
EP0509117B1
EP0509117B1 EP91106181A EP91106181A EP0509117B1 EP 0509117 B1 EP0509117 B1 EP 0509117B1 EP 91106181 A EP91106181 A EP 91106181A EP 91106181 A EP91106181 A EP 91106181A EP 0509117 B1 EP0509117 B1 EP 0509117B1
Authority
EP
European Patent Office
Prior art keywords
longitudinal slot
pressure cylinder
plastics
recess
steel band
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
EP91106181A
Other languages
German (de)
English (en)
Other versions
EP0509117A1 (fr
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
Priority to EP91106181A priority Critical patent/EP0509117B1/fr
Priority to DE59107481T priority patent/DE59107481D1/de
Priority to US07/868,790 priority patent/US5241897A/en
Priority to JP4098149A priority patent/JP2502241B2/ja
Publication of EP0509117A1 publication Critical patent/EP0509117A1/fr
Application granted granted Critical
Publication of EP0509117B1 publication Critical patent/EP0509117B1/fr
Priority to HK98100675A priority patent/HK1001698A1/xx
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
    • F15B15/08—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

Definitions

  • the invention relates to a pressure medium cylinder with an interior in which a piston can be moved back and forth, and with a longitudinal slot extending over the length of the cylinder, through which a lateral extension connected to the piston for power transmission is guided to the outside and on the inside is sealed by a steel band which is held in position on the inside of the longitudinal slot by permanent magnets arranged in the area of the outside of the longitudinal slot and is guided through the latter in the area of the piston.
  • Pressure medium cylinders of this type which are also referred to as rodless pressure medium cylinders, are known.
  • the essentially circular cylindrical interior is flattened on both sides of the longitudinal slot, so that the steel strip does not bend as much.
  • the inside of the steel strip is chamfered in the area of its longitudinal edges.
  • a pressure medium cylinder of this type (WO 83/02306), in which holding devices for clamping with the side walls of the longitudinal slot are arranged on the outward-facing side of the steel sealing tape. It can be a continuous plastic profile with a U-shaped cross section, the legs of which are prestressed to the outside, as well as pairs of individual metal clips. The task of these mounting devices is to fix the steel strip in the area of the slot so that magnets are no longer required.
  • GB-A-2 163 499 describes a pressure medium cylinder of the type according to the application, in which the longitudinal slot of the cylinder tube is sealed by an elastic sealing tape, into which a flexible steel tape can be installed as a reinforcement.
  • the sealing tape is held in the longitudinal slot by fastened to it, V-shaped diverging webs which engage in grooves in the wall of the longitudinal slot or protrude beyond the outer edge of the longitudinal slot and thus also seal the outside of the longitudinal slot.
  • the elastic band is held in place by friction on the walls of the longitudinal slot.
  • V-shaped webs instead of the V-shaped webs, other cross sections of the sealing tape are shown, which engage with projections in recesses in the walls of the longitudinal slot.
  • the stiffening band consists of a thin ferritic steel band and is arranged on the cover band, at least in places permanently magnetic holding band projecting into the longitudinal slot.
  • the magnetic closing circuit of the tether runs over the ferromagnetic stiffening strap and exerts on that of the tether mechanically separated inner sealing tape from a holding force that extends in the radial direction of the cylinder tube.
  • the steel sealing tapes are preferred because of their longer life.
  • the invention has for its object to provide a pressure cylinder, in which the band is fixed laterally, so that the life of the seals and the seal remains guaranteed.
  • the invention proposes to fasten a continuous plastic strip on the outward-facing side of the steel strip, the width of which is somewhat smaller than the distance between the walls of the longitudinal slot.
  • This plastic strip enables the metallic sealing tape to be positioned or centered relative to the longitudinal slot in a very simple manner. It can therefore be provided in particular that the arrangement of the plastic strip on the steel strip corresponds to the spatial arrangement between the steel strip and the longitudinal slot. It is entirely sufficient that the width of the plastic strip is slightly smaller than the width of the longitudinal slot, since in this way the sealing tape is adequately centered.
  • a particularly preferred way of fastening the plastic strip by the invention is that in a further development of the invention the steel strip is extrusion-coated. With this plastic encapsulation, the entire surface of the steel strip is provided with plastic material, but this does not interfere in any way, since the holding force of the magnets is sufficiently large.
  • any shape of the profile can be produced, including the arrangement of the plastic strip on the outside of the Steel bands.
  • the invention proposes that the steel strip, viewed in cross-section, is straight and possibly, as is known per se, wider than the longitudinal slot.
  • the inside of the cylinder has a recess on both sides of the edges of the longitudinal slot, in which the plastic-coated steel strip lies and which is filled by the plastic coating of the steel strip.
  • the transitions on the side edges of the sealing tape can be better accommodated, since they are no longer in the cylinder interior.
  • the steel strip also no longer needs to be chamfered on the inside, as is known in the prior art.
  • the inside of the plastic encapsulation lies in the cylinder surface of the interior of the pressure medium cylinder. This means that the sealing tape no longer disturbs the circular cylinder surface of the interior, so that the seals arranged at the end of the piston enable an increased service life and an improved seal.
  • the invention proposes that the inside of the recess and the outside of the plastic sheathing be rounded or inclined.
  • the inside of the recess and the outside of the plastic encapsulation of the steel strip are matched to one another in such a way that when the longitudinal slot is widened, the plastic encapsulation slides on the inside of the recess without the formation of a space or slot. In this way, the seal is retained even with very long cylinders, in which there is a certain widening of the longitudinal slot when pressure is applied in the interior.
  • the pressure medium cylinder shown in cross section in FIG. 1 contains a housing 1 which, for example, consists of aluminum.
  • the housing contains an eccentrically arranged circular cylindrical interior 2, which extends over the entire length of the cylinder.
  • a piston (not shown) is arranged in the interior 2 and can be moved back and forth in the longitudinal direction of the cylinder. It is driven by a higher pressure on one side of the piston in the interior 2 than on the other side.
  • the housing 1 has a longitudinal slot 3 which extends in the longitudinal direction and through which an attachment connected to the piston projects. The force generated by the piston can be taken from the part of the attachment arranged outside the housing 1.
  • the longitudinal slot 3 is sealed from the inside of the cylinder by a steel band 4.
  • the steel strip 4 has a width which is greater than the width of the longitudinal slot 3. So that the steel strip is held in the sealing position shown, magnets 5 are inserted into the housing wall from the outside on both sides of the longitudinal slot 3. It can be, for example, individual magnets 5 distributed over the length. These hold the steel strip 4 in place even when the interior 2 is depressurized.
  • the magnets 5 generate an essentially radially acting force on the steel strip 4. This force would still allow the steel strip to move laterally, ie to the right or left in FIG. 1.
  • a plastic strip 7 is fastened on the outside 6 of the steel strip 4 arranged at the top in FIG. 1.
  • the width of the plastic strip 7 seen in FIG. 1 is somewhat smaller than the distance between the side walls 8 of the longitudinal slot 3. In this way, the steel strip 4 is centered with respect to the longitudinal slot 3 and its lateral deviation is reduced to a small amount limited.
  • the plastic strip 7 is not used to fix the sealing tape to the cylinder housing 1.
  • the cross section of the plastic strip 7 corresponds approximately to the cross section of the longitudinal slot, ie in the case of parallel side walls 8, the corresponding side surfaces of the plastic strip 7 are also parallel to one another.
  • the plastic strip 7 is fastened on the outside 6 of the steel strip 4 in a manner which corresponds to the desired arrangement of the steel strip 4 with respect to the slot 3. With a desired central alignment of the steel strip 4 to the longitudinal slot 3, the plastic strip 7 is thus also aligned centrally.
  • FIG. 1 While in the embodiment of FIG. 1 the plastic strip 7 is only attached, for example glued, to the outside 6 of the sealing tape 4 made of steel, the embodiment of FIG. 2 shows a sealing tape 9 in which the steel tape 4 is surrounded on all sides by a plastic coating 10.
  • the plastic encapsulation 10 forms on the outside 6 of the steel strip 4 the plastic strip 7 already present in the embodiment of FIG Steel strip 4 runs.
  • the sealing tape 9 of Figure 2 can be used with a cylinder housing according to Figure 1.
  • Plastic extrusion is a particularly preferred way of securing the plastic strip 7 on the outside 6 of the steel strip 4.
  • the plastic encapsulation improves the sealing.
  • Figure 3 shows a further embodiment in which the Inside 12 of the cylinder housing 1 has on each side of the longitudinal slot 3 a recess 13 extending in the longitudinal direction of the housing 1.
  • Both recesses 13 are mirror images of each other. They contain a flat shoulder 14, which runs like a sinew with respect to the cylinder interior 2.
  • the recess 13 widens from the shoulders 14 in the direction of the interior.
  • the plastic extrusion coating 10 of the steel strip 4 is shaped such that it not only forms the plastic strip 7 on the rear side 6 of the steel strip 4, but also has a cross section that completely fills the recesses 13 on both sides of the longitudinal slot 3. Similar to the embodiment in FIG. 2, the plastic encapsulation 10 thus acts as a seal. However, the steel strip 4 is again fixed here by magnets 5.
  • the side flanks 18 of the recess of the embodiment according to FIG. 4 are very strongly inclined and therefore run relatively flat. There are therefore relatively long areas between the recess and the Plastic extrusion 16 formed. If, in the embodiment according to FIG. 4, the longitudinal slot breathes somewhat, ie widens, the plastic extrusion can slide somewhat on the recess due to the long flanks 18, without there being an intermediate space from which pressure medium could escape.
  • the recess 19 has a curved cross section without the longitudinal edge present in FIGS. 3 and 4.
  • the inner surface 15 of the plastic encapsulation 16 is arranged lying in the circular cylinder surface 17 of the interior 2.
  • the boundary surface of the recess can be designed so that when the slot is widened, the plastic encapsulation slides on the recess without creating a gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (9)

  1. Vérin à fluide sous pression comportant une chambre intérieure (2) dans laquelle un piston peut se déplacer en va-et-vient, ainsi qu'une fente (3) longitudinale s'étendant sur la longueur du cylindre, à travers laquelle un prolongement latéral relié au piston est mené jusqu'à l'extérieur pour la transmission de la force et qui est étanchéifié sur la face intérieure par un ruban d'acier (4) qui est maintenu dans sa position sur la face intérieure de la fente longitudinale (3) grâce à des aimants permanents (5) agencés dans la région de la face extérieure de la fente longitudinale (3) et qui est guidé dans la région du piston à travers celui-ci, caractérisé en ce qu'une bande (7) de matière plastique continue est fixée de manière connue en soi sur le côté (10) dirigé vers l'extérieur du ruban d'acier (4) et en ce que la largeur de la bande (7) de matière plastique est inférieure à l'écartement des parois (8) l'une par rapport à l'autre de la fente longitudinale (3).
  2. Vérin à fluide sous pression selon la revendication 1, caractérisé en ce que l'agencement de la bande (7) de matière plastique sur le ruban d'acier (4) correspond à l'agencement géométrique entre le ruban d'acier (4) et la fente longitudinale (3).
  3. Vérin à fluide sous pression selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce que pour fixer la bande (7) de matière plastique, le ruban d'acier (4) est enrobé de matière plastique.
  4. Vérin à fluide sous pression selon l'une quelconque des revendications précédentes, caractérisé en ce que le ruban d'acier (4) est de section rectiligne.
  5. Vérin à fluide sous pression selon l'une ou l'autre des revendications 3 et 4, caractérisé en ce que sur sa face intérieure, le cylindre présente des deux côtés des bordures de la fente longitudinale 3 un évidement 13, 19 dans lequel est situé le ruban d'acier (4) enrobé de matière plastique et qui est rempli par l'enrobage de matière plastique (10, 16).
  6. Vérin à fluide sous pression selon l'une quelconque des revendications 3 à 5, caractérisé en ce que la face intérieure (15) de l'enrobage de matière plastique (16) est située dans la surface cylindrique (17) de la chambre intérieure (2) du vérin à fluide sous pression.
  7. Vérin à fluide sous pression selon l'une ou l'autre des revendications 5 et 6, caractérisé en ce que la face intérieure de l'évidement (19) et la face extérieure de l'enrobage de matière plastique (16) s'étendent en arrondi.
  8. Vérin à fluide sous pression selon l'une quelconque des revendications 5 à 7, caractérisé en ce que la face intérieure de l'évidement (13) et la face extérieure de l'enrobage de matière plastique (10) sont obliques.
  9. Vérin à fluide sous pression selon l'une quelconque des revendications 5 à 8, caractérisé en ce que la face intérieure de l'évidement et la face extérieure de l'enrobage de matière plastique (10, 16) sont adaptées l'une à l'autre de telle sorte que lorsque la fente longitudinale (3) s'élargit, il se produit un glissement de l'enrobage de matière plastique (10, 16) sur l'évidement, sans formation d'un interstice.
EP91106181A 1991-04-18 1991-04-18 Vérin à fluide sous pression Expired - Lifetime EP0509117B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP91106181A EP0509117B1 (fr) 1991-04-18 1991-04-18 Vérin à fluide sous pression
DE59107481T DE59107481D1 (de) 1991-04-18 1991-04-18 Druckmittelzylinder
US07/868,790 US5241897A (en) 1991-04-18 1992-04-15 Pressurized medium cylinder
JP4098149A JP2502241B2 (ja) 1991-04-18 1992-04-17 圧力媒体シリンダ
HK98100675A HK1001698A1 (en) 1991-04-18 1998-01-26 Pressure fluid actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91106181A EP0509117B1 (fr) 1991-04-18 1991-04-18 Vérin à fluide sous pression

Publications (2)

Publication Number Publication Date
EP0509117A1 EP0509117A1 (fr) 1992-10-21
EP0509117B1 true EP0509117B1 (fr) 1996-02-28

Family

ID=8206634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106181A Expired - Lifetime EP0509117B1 (fr) 1991-04-18 1991-04-18 Vérin à fluide sous pression

Country Status (5)

Country Link
US (1) US5241897A (fr)
EP (1) EP0509117B1 (fr)
JP (1) JP2502241B2 (fr)
DE (1) DE59107481D1 (fr)
HK (1) HK1001698A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401554B (de) * 1994-05-18 1996-10-25 Hygrama Ag Kolbenstangenloser druckmittelzylinder
US6092456A (en) * 1997-06-11 2000-07-25 Howa Machinery, Ltd. Rodless power cylinder
US6257123B1 (en) 1997-10-24 2001-07-10 Phd, Inc. Rodless slides
US5988042A (en) * 1997-10-24 1999-11-23 Phd, Inc. Rodless cylinder with internal bearings
US5996469A (en) * 1998-04-07 1999-12-07 Greenco Manufacturing Corporation Rodless power cylinder
US6857780B2 (en) * 2002-11-15 2005-02-22 Phd, Inc. Rodless slide assembly
DE10300600B3 (de) * 2003-01-10 2004-04-29 Carl Freudenberg Kg Druckmittelzylindler mit einem längsgeschlitzten Zylinderrohr
JP5176681B2 (ja) 2008-05-12 2013-04-03 豊和工業株式会社 ロッドレスシリンダ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664020A (en) * 1981-06-25 1987-05-12 Proma Produkt-Und Marketing Gesellschaft M.B.H. Piston-cylinder structure
SE8107724L (sv) * 1981-12-22 1983-06-23 Mecman Ab Anordning vid en kolvstangslos tryckmediecylinder
US4545290A (en) * 1983-12-23 1985-10-08 Tol-O-Matic, Inc. Pressure cylinder
DE3429783A1 (de) * 1984-08-13 1986-02-20 Herion-Werke Kg, 7012 Fellbach Kolbenstangenloser zylinder
DE3631514A1 (de) * 1986-09-17 1988-03-24 Proma Prod & Marketing Gmbh Druckmittelzylinder

Also Published As

Publication number Publication date
HK1001698A1 (en) 1998-07-03
JPH05118303A (ja) 1993-05-14
US5241897A (en) 1993-09-07
DE59107481D1 (de) 1996-04-04
EP0509117A1 (fr) 1992-10-21
JP2502241B2 (ja) 1996-05-29

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