EP0684390A1 - Vérin à piston sans tige - Google Patents

Vérin à piston sans tige Download PDF

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Publication number
EP0684390A1
EP0684390A1 EP95890094A EP95890094A EP0684390A1 EP 0684390 A1 EP0684390 A1 EP 0684390A1 EP 95890094 A EP95890094 A EP 95890094A EP 95890094 A EP95890094 A EP 95890094A EP 0684390 A1 EP0684390 A1 EP 0684390A1
Authority
EP
European Patent Office
Prior art keywords
longitudinal slot
cylinder
pressure medium
sealing tape
pressure
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
EP95890094A
Other languages
German (de)
English (en)
Other versions
EP0684390B1 (fr
Inventor
Volker Drittel
Peter Rohatschek
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 EP0684390A1 publication Critical patent/EP0684390A1/fr
Application granted granted Critical
Publication of EP0684390B1 publication Critical patent/EP0684390B1/fr
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 rodless pressure medium cylinder with a longitudinally slotted cylinder housing, which is closed at its ends by a cylinder cover and in the interior of which a drive piston is arranged so as to be longitudinally displaceable, from which a lateral extension is guided outwards through the longitudinal slot of the cylinder housing, which is guided by an in
  • the sealing tape provided inside the cylinder housing can be sealed, which is lifted from the longitudinal slot only in the region of the attachment and is guided through a guide channel in the drive piston.
  • Pressure medium cylinders of this type which are preferably actuated by compressed air or another compressed gas, can in practice be arranged in different spatial positions.
  • the longitudinal slot is directed upwards or to the side, so that the sealing tape can separate from the longitudinal slot due to its own weight if there is no pressure in the interior of the cylinder housing or in a section thereof. In this case, there is no longer any seal in the relevant section of the cylinder housing.
  • the sealing tape is made of steel and is held against it by magnets arranged in the cylinder housing.
  • the longitudinal slot is sealed by an outer and an inner sealing tape, which each protrude with an extension into the longitudinal slot, where they engage in one another in a zipper-like manner and so on hold on to each other.
  • Another known embodiment provides for the sealing tape to be fixed to the side walls of the longitudinal slot.
  • longitudinal grooves are provided in the side walls, in which corresponding projections of the sealing tape engage in a form-fitting manner.
  • grooves must be formed in the walls of the relatively narrow longitudinal slot, which means an additional effort, and the associated sealing tapes must be provided with extensions and a profile that matches the longitudinal grooves.
  • the invention is based on the knowledge that a complete and secure sealing of the longitudinal slot in the cylinder housing is only necessary in the pressurized state of the same, whereas in the state not acted upon by the pressure of the actuating means, a complete seal can be dispensed with if a rapid pressure is applied Sealing is ensured.
  • the invention is therefore based on the object of improving the known rodless pressure medium cylinders by simplifying the measures provided for sealing the longitudinal slot.
  • the sealing tape is arranged as an internal sealing tape without its own holding means in front of the longitudinal slot and is guided from one end of the pressure medium cylinder along the longitudinal slot through the guide channel in the drive piston to the other end of the pressure medium cylinder, it being in the unpressurized State of the pressure medium cylinder is partially raised from the longitudinal slot and only rests on the longitudinal slot in the area of the cylinder cover and / or partially engages in it.
  • any holding means that are otherwise provided to hold the sealing tape on the longitudinal slot are therefore omitted. It has been shown surprisingly that in the inventive design of the pressure cylinder and in particular at the inventive arrangement of the inner sealing tape, the holding means are superfluous and the sealing is carried out by physical pressure differences that occur when the pressure medium flows into the cylinder space.
  • the longitudinal slot is covered in a manner known per se by an outer sealing tape which is passed through a channel in the lateral extension of the drive piston, and the outer sealing tape is designed so that it is in the on the Longitudinal slot overlying areas this airtight.
  • an outer sealing tape which is available in known designs to cover the longitudinal slot to the outside and - in certain versions - even to hold the inner sealing tape in the unpressurized state of the cylinder space at the longitudinal slot, the closing of the longitudinal slot is further improved and accelerated when the cylinder space is pressurized.
  • the inner sealing tape is preferably made of elastomeric material. It is therefore elastic and flexible, so that only relatively small forces are required for its application to the longitudinal slot. To ensure a good seal, the inner sealing tape is expediently tapered outwards.
  • the inner sealing tape in the area covering the longitudinal slot can be made wider than the slot and in its central part with a reinforcing back, which is narrower than the slot and projects into it with lateral play.
  • the wide part of the sealing tape ensures the sealing, whereas the back reinforces and stiffens what not only has a favorable effect on the service life of the sealing tape, but also prevents sagging too far when depressurized and, as a result, prevents large leaks.
  • the outer sealing tape can have a shape that completely covers the longitudinal slot and can be made of sealing material, and it also prevents the pressure medium from flowing out to the outside.
  • This preferred design and arrangement of the outer sealing tape ensures a tight closure of the longitudinal slot to the outside, thus preventing a rapid flow of pressure medium supplied through the gaps that occur when the inner sealing tape is sagging, and enables the formation of the vacuum accelerating the closing between between the two sealing tapes.
  • the outer sealing tape can also be made of an elastomeric material.
  • FIG. 1 shows a longitudinal section through the pressure medium cylinder according to the invention on the pressurized cylinder side
  • FIG. 2 shows a longitudinal section through the cylinder on the depressurized cylinder side
  • FIG. 3 shows a cross section along the line III-111 in FIG. 2.
  • the pressure medium cylinder shown has a cylinder housing 1, which forms a cylindrical interior 2, in which a drive piston 3 is displaceable.
  • the cylinder housing 1 is closed at its ends by cylinder covers 4, in which the pressure medium channels 5 are also provided for the supply and / or discharge of the pressure medium.
  • the drive piston 3 is guided in the interior 2 by seals arranged in its end regions and not shown in the drawings.
  • the cylinder housing 1 is provided with a longitudinal slot 6 which extends over its entire length and is provided in the exemplary embodiment shown on the top side of the cylinder housing 1.
  • a side extension 7 is attached, which is guided through the longitudinal slot 6 through the cylinder housing 1 to the outside and in the embodiment with a connecting flange 8 or the like. ends, via which the driving force of the pressure cylinder 1 can be removed.
  • the devices or devices which are to be driven by the pressure medium cylinder 1 are connected to this flange 8.
  • An inner sealing tape 9 and an outer sealing tape 10 are provided to seal the longitudinal slot 6. Both sealing tapes 9 and 10 are attached to the ends of the cylinder housing 1 in a manner not shown in the exemplary embodiment in the region of the cylinder cover 4, whereby they are guided from one end of the cylinder housing 1 along the longitudinal slot 6 to the other end of the cylinder housing 1.
  • the inner sealing band 9 is guided through a guide channel 11 which passes through the extension 7 in the area of the drive piston 3, but alternatively can also be provided in the drive piston 3 itself.
  • a channel 12 bulging outward from the cylinder housing 1 is provided, through which the outer sealing tape 10 passes.
  • the cross section of the two sealing tapes 9 and 10 can be seen from FIG.
  • the inner sealing tape 9 tapers from the inside to the outside. It has a lower part 13 with tapered side edges and is wider there than the slot 6, so that it can cover it.
  • the inner sealing tape 9 is provided with a reinforcing back 14, which is narrower than the longitudinal slot 6 and projects into it with lateral play.
  • the outer sealing tape 10, is designed with a flat cross section, which fits into the longitudinal slot 6 and has a widened outer part 15, which is wider than the longitudinal slot 6 and lies on the sides of the same to the cylinder housing 1 sealingly. Special holding means for holding the sealing tapes 9 and 10 on the cylinder housing 1 are not provided.
  • the two sealing tapes 9 and 10 can be made of elastomeric material without reinforcing or other inserts.
  • Fig. 1 the interior 2 of the cylinder housing 1 is acted upon by the pressure medium channel 5 in the cylinder cover 4 with pressure medium.
  • the resulting pressure in the interior 2 presses the inner sealing band 9 against the gap 6 and seals it, so that the full pressure of the pressure medium acts on the end face of the drive piston and moves it.
  • the outer sealing tape 10 lies on the outside of the cylinder housing 1 and covers the longitudinal slot 6 from the outside.
  • the two sealing tapes 9 and 10 are lifted from the longitudinal slot 6 only in the area of the extension 7, so that the extension 7 can lead from the drive piston 3 through the longitudinal slot 6 to the outside.
  • the sealing tapes 9, 10 rest against the cylinder housing 1.
  • FIG. 2 shows the position of the sealing tapes 9 and 10 when the interior 2 of the cylinder housing 1 is depressurized.
  • the inner sealing tape 9 is partially lifted from the longitudinal slot 6 and sags into the interior 2, so that gaps 16 open on both sides to the longitudinal slot 6 arise, which are shown exaggerated in Fig. 2 for clarity.
  • the inner sealing tape 9 can easily detach from the longitudinal slot 6, since there is no holder for the sealing tape 9.
  • the inner sealing tape 9 sagging in the interior 2 can also be clearly seen in the cross section shown in FIG. 3.
  • the arrangement according to the invention thus dispenses with any type of special holding means which fix the sealing tapes 9, 10, in particular the inner sealing tape 9, to the longitudinal slot 6 when the interior 2 of the cylinder housing 1 is depressurized.
  • the pressure medium cylinder according to the invention is considerably simpler than the previously known designs and the sealing tapes can also be made simpler and cheaper. Nevertheless, operational safety is increased because operational disruptions caused by the holding means are eliminated from the outset.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP95890094A 1994-05-18 1995-05-17 Vérin à piston sans tige Expired - Lifetime EP0684390B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1023/94 1994-05-18
AT102394A AT401554B (de) 1994-05-18 1994-05-18 Kolbenstangenloser druckmittelzylinder

Publications (2)

Publication Number Publication Date
EP0684390A1 true EP0684390A1 (fr) 1995-11-29
EP0684390B1 EP0684390B1 (fr) 1998-09-30

Family

ID=3505053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95890094A Expired - Lifetime EP0684390B1 (fr) 1994-05-18 1995-05-17 Vérin à piston sans tige

Country Status (3)

Country Link
EP (1) EP0684390B1 (fr)
AT (1) AT401554B (fr)
DE (1) DE59503755D1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473430A (en) 1945-05-19 1949-06-14 Le Roi Company Piston coupling mechanism
CH508830A (de) * 1970-04-10 1971-06-15 Ingenjors Mecmatic Ab Fa Vorrichtung zur Erzeugung und Übertragung einer Bewegung
US3820446A (en) * 1971-12-20 1974-06-28 Origa Cylindrar Ab Means at pressure fluid cylinders
DE3124878C1 (de) * 1981-06-25 1982-12-09 Kaiser, Siegmund H., Ing.(grad.), 7440 Nürtingen Druckmittelzylinder
DE8424035U1 (de) * 1984-08-13 1984-11-22 Herion-Werke Kg, 7012 Fellbach Kolbenstangenloser zylinder
EP0147803A2 (fr) 1983-12-23 1985-07-10 Tol-O-Matic, Inc. Cylindre à pression
EP0260344A2 (fr) * 1986-09-17 1988-03-23 NORGREN MARTONAIR EUROPA GmbH Cylindre pour fluide sous pression
GB2202587A (en) * 1987-03-12 1988-09-28 Ckd Corp Rod-less piston and cylinder assembly
EP0531131A1 (fr) * 1991-09-06 1993-03-10 Smc Corporation Vérin sans tige

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04266606A (ja) * 1991-02-19 1992-09-22 Akio Matsui ロッドレスシリンダ
DE59107481D1 (de) * 1991-04-18 1996-04-04 Hygrama Ag Druckmittelzylinder
US5333535A (en) * 1992-07-21 1994-08-02 Smc Kabushiki Kaisha Rodless cylinder

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473430A (en) 1945-05-19 1949-06-14 Le Roi Company Piston coupling mechanism
CH508830A (de) * 1970-04-10 1971-06-15 Ingenjors Mecmatic Ab Fa Vorrichtung zur Erzeugung und Übertragung einer Bewegung
US3820446A (en) * 1971-12-20 1974-06-28 Origa Cylindrar Ab Means at pressure fluid cylinders
DE3124878C1 (de) * 1981-06-25 1982-12-09 Kaiser, Siegmund H., Ing.(grad.), 7440 Nürtingen Druckmittelzylinder
EP0069199A1 (fr) 1981-06-25 1983-01-12 PROMA Produkt- und Marketing-Gesellschaft m.b.H. Vérin à fluide
EP0147803A2 (fr) 1983-12-23 1985-07-10 Tol-O-Matic, Inc. Cylindre à pression
DE8424035U1 (de) * 1984-08-13 1984-11-22 Herion-Werke Kg, 7012 Fellbach Kolbenstangenloser zylinder
EP0260344A2 (fr) * 1986-09-17 1988-03-23 NORGREN MARTONAIR EUROPA GmbH Cylindre pour fluide sous pression
GB2202587A (en) * 1987-03-12 1988-09-28 Ckd Corp Rod-less piston and cylinder assembly
EP0531131A1 (fr) * 1991-09-06 1993-03-10 Smc Corporation Vérin sans tige

Also Published As

Publication number Publication date
AT401554B (de) 1996-10-25
DE59503755D1 (de) 1998-11-05
ATA102394A (de) 1996-02-15
EP0684390B1 (fr) 1998-09-30

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