EP0690237A1 - Entraînement linéaire - Google Patents

Entraînement linéaire Download PDF

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Publication number
EP0690237A1
EP0690237A1 EP95105983A EP95105983A EP0690237A1 EP 0690237 A1 EP0690237 A1 EP 0690237A1 EP 95105983 A EP95105983 A EP 95105983A EP 95105983 A EP95105983 A EP 95105983A EP 0690237 A1 EP0690237 A1 EP 0690237A1
Authority
EP
European Patent Office
Prior art keywords
holding
housing
linear drive
drive according
strips
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
EP95105983A
Other languages
German (de)
English (en)
Other versions
EP0690237B1 (fr
Inventor
Kurt Dr. Stoll
Dieter Waldmann
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
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 Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP0690237A1 publication Critical patent/EP0690237A1/fr
Application granted granted Critical
Publication of EP0690237B1 publication Critical patent/EP0690237B1/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 linear drive, having a housing which has a longitudinal slot which extends in the longitudinal direction and extends radially between an interior space and an outer surface of the housing, with a drive part which is arranged to be longitudinally movable in the interior of the housing and on which a driver which penetrates the longitudinal slot crosswise is arranged, and with a in the radially inner region of the longitudinal slot extending along this flexible sealing tape, which assumes a sealing position axially on both sides of the drive part, in which it is in sealing contact with the housing on both longitudinal sides of the longitudinal slot, wherein it is in the sealing position inside of the longitudinal slot is mechanically detachably held by engaging with a holding part between two housing-fixed holding elements extending in the longitudinal direction of the slot.
  • the holding elements are in one piece on the diaphragm wall formed longitudinal ribs, between which the sealing tape engages in the sealing position with an elastically deformable holding part.
  • Such a mechanical fixation prevents the sealing tape from sagging into the interior of the housing in the areas lying between the drive part and the housing ends. This is particularly important in the case of fluidically actuated linear drives, in which a sagging sealing tape results in the escape of pressure medium and thereby impairs the function of the linear drive. The sag problem occurs especially with extremely long linear drives.
  • a certain inadequacy in the prior art is that in the event of wear or damage to the longitudinal ribs, the entire cylinder tube must be replaced. Such wear can be caused, for example, by the fact that the driver, which is regularly made of metal, slides along its longitudinal displacement along the longitudinal ribs, which are also made of metal. Furthermore, the slot geometry of the housing of the linear drive is fixed in an unchangeable manner, so that, under certain circumstances, a sensible adaptation to a sealing tape of another design is not possible.
  • the object of the present invention is therefore considered to be to provide a linear drive of the type mentioned at the outset which, while maintaining a secure fixation of the sealing tape in the sealing position, enables the problem of wear to be reduced and easily adapted to sealing tapes of different designs in the area of the holding part.
  • the two holding elements are formed by two holding strips which are formed separately with respect to the housing and are fixed in the region of the outer surface of the housing and protrude into the longitudinal slot.
  • the sealing tape is no longer held in the sealing positions on the diaphragm wall, but rather on holding strips protruding into the slot, which are fixed in the area of the outer surface of the housing.
  • the separate design of the retaining strips enables a coordinated selection of materials to prevent possible wear. For example, it is possible to manufacture the retaining strips from extremely wear-resistant plastic material. Because of the fastening in the area of the outer surface, the retaining strips can be easily attached to the housing from the outside. If the retaining strips are detachably fastened, they can be easily replaced in the event of wear, without having to completely disassemble the linear drive. By using differently shaped holding strips, sealing tapes with differently shaped holding parts can also be taken into account. It would also be conceivable to provide the holding strips directly as guide strips which cooperate with the side surfaces of the driver and in this way to combine both a holding function and a guiding function in the holding strips.
  • a linear drive emerges from EP 0 082 829 B1, in which the sealing tape works directly with the slotted walls for fixing in the sealing positions via holding means.
  • EP 0 147 803 B1 there are additional, on the sealing tape externally projecting retaining lips are provided which engage in retaining grooves in the diaphragm walls.
  • a comparable fixation is also proposed in DE 34 29 783 A1 and DE 38 07 786 C2.
  • the sealing tape is fixed by elastic holding elements fastened directly in the slot.
  • the holding strips protrude into the slot while maintaining a lateral distance from the respectively adjacent slot wall.
  • the resulting space between a respective holding element and the adjacent diaphragm wall can be used, for example, as a lubricant depot from which lubricant can drip onto the sealing surfaces of the sealing tape in order to improve the sealing contact with the housing.
  • the sealing tape itself can be made relatively thin, which benefits its flexibility.
  • the holding elements In principle, it would be possible to design the holding elements to be self-resetting in a transverse manner.
  • the holding strips are rigid and the flexibility in the transverse direction required for threading and unthreading the holding part of the sealing tape appears more advantageous through a correspondingly designed holding part of the To ensure sealing tape.
  • the holding section can have two transverse flexible longitudinal ribs arranged next to one another with transverse spacing, each of which cooperates with one of the holding strips.
  • the linear drive 1 is a pressure-rod-free working cylinder. It has an externally circular or preferably rectangular or square contoured housing 2 with a longitudinal extension, in the interior of which a likewise longitudinally extending interior 3 is formed, the cross-sectional contour of which is oval, elliptical or preferably circular.
  • the inner walls 3 delimiting end walls 4 are provided, which are designed here as a housing cover.
  • a drive part 6 which is movable back and forth in the direction of the longitudinal axis 5 of the housing 2 and which is designed here as a rodless piston which seals the interior 3 into two axially successive housing spaces 7, 7 '.
  • the drive part 6 being in engagement, for example, with a motor-driven spindle, during the rotation of which the drive part 6 is axially displaced.
  • the housing 2 has a longitudinal slot 8, which extends axially over the entire length of the housing and radially penetrates the housing wall at the relevant point transversely to the longitudinal axis 5. It therefore opens on the one hand radially inward, to the interior 3 mentioned, whereby it merges into the peripheral surface 13 of the interior 3 provided on the housing 2.
  • the longitudinal slot 8 opens radially to the outside and merges into the laterally adjacent outer surface 12 of the housing 2.
  • a driver 14 is arranged on the drive part 6 and extends radially through the longitudinal slot 8 to the outside of the housing 2. In the exemplary embodiment, it is designed in the manner of a tab or plate. On its part 15 lying outside the housing 2, an object, not shown, can be fastened to be moved. A guide part can also be arranged here, which is guided on a longitudinal guide arranged on the housing 2. The connection of the driver 14 to an object to be moved can be done via this guide part.
  • a sealing tape 16 consisting of flexible material is arranged on the radially inner region of the longitudinal slot 8. It extends in the longitudinal direction of the longitudinal slot 8. According to the example, it consists of plastic material and has one or more reinforcing inserts 17 on the inside, which can be constructed in the manner of a rope or fiber and, for example, made of metal or carbon fiber material consist. They extend over the entire length of the sealing tape.
  • the sealing tape 16 is fixed to the housing 2 at its two end regions 18, 18 ', preferably on the two end walls 4. It has an essentially trapezoidal cross-sectional contour.
  • the sealing tape 16 With its sections 22 lying axially on both sides of the drive part 6, that is to say with the sections assigned to a respective housing space 7, 7 ', the sealing tape 16 assumes a sealing position, generally designated 23. 2, it is in sealing contact with the housing 2 in the region of both longitudinal sides 24 of the longitudinal slot 8.
  • the corresponding housing-side sealing contact surfaces 25 are each designed in a strip-like manner, with respect to the radial plane 26 of the longitudinal slot 8 running in the center of the slot are inclined so that they move radially inward from the radial plane 26. They are located at right angles to the radial plane 26. They are preferably slightly concave in shape, as can be clearly seen in FIG. 3.
  • the sealing tape 16 is acted upon on its radially inward-facing inner surface 27 and pressed firmly against the sealing contact surfaces 25 on the housing.
  • the sealing tape 16 runs through the drive part in the area of the drive part 6 6, which has a suitable through channel 28 for this purpose.
  • the sealing tape 16 is thus lifted radially inward at least in the area of the driver 14 from the sealing contact surfaces 25 on the housing side and assumes the ineffective position 29 shown in FIG. 3 with the corresponding sealing tape section.
  • annular sealing arrangement 32 is provided at both axial end regions of the drive part 6, which works in a sealing manner with the peripheral surface 13 of the interior 3 and the inner surface 27 of the sealing tape 16, so that a respective one Housing space 7, 7 'is sealed on the opposite side of a respective end wall 4 by the drive member 6.
  • the sealing-band-side sealing-contact surfaces 33 which cooperate with the housing-side sealing contact surfaces 25 in the sealing position 23, can likewise be contoured in a concave manner (FIG. 3), wherein the pressurization can cause a deformation of the sealing band 16, indicated by dash-dotted lines in FIG. 2 at 34, into the longitudinal slot 8, whereby the band-side The sealing contact surface 33 is deformed into the sealing contact surface 25 on the housing and conforms to it.
  • a continuous holding part 35 is provided which can engage between two holding strips 36, 36 'extending in the longitudinal direction of the slot and fixed to the housing and is held there.
  • the sealing tape 16 can be easily removed from the mechanical clamp connection with a certain, radially inward tensile stress.
  • the drive part 6 is axially displaced at the transition regions 37 between a respective sealing position 23 and the ineffective position 29 of the sealing tape 16, threading out or in takes place from or into the holding strips 36, 36 '.
  • the holding strips 36, 36 ' are designed as profiled strips and, viewed in cross section, have an L-like shape, the angle between the two L legs, however, expediently being greater than 90 °.
  • the one L-leg which is somewhat shorter in the exemplary embodiment, forms a fastening section 38 with which a respective retaining strip 36, 36 ′ is fastened in the region of the outer surface 12 of the housing 2.
  • the other L-leg which is longer in the exemplary embodiment, forms a holding section 39 which projects into the longitudinal slot 8 from the outside.
  • the holding strips 36, 36 ' are at a distance opposite one another at right angles to the radial plane 26, the one on the latter Wise existing space 42 allows the driver 14 ( Figure 3) to pass through.
  • the holding strips 36, 36 ' with their end regions of their holding sections 39 which end freely in the longitudinal slot 8, form a clamping space 43 into which the sealing part 35 on the sealing tape side projects in the sealing position.
  • the holding strips 36, 36 ' are preferably rigid in this case and can for example consist of a relatively hard plastic material, the holding sections 39 being immovable with respect to the housing 2 transversely to the radial plane 26.
  • the width of the clamping space 43 is always constant.
  • this is designed to be elastically resilient with respect to the remaining sealing tape section transversely to the radial plane 26.
  • it comprises two longitudinal ribs 44 which are arranged next to one another at a transverse spacing and run along the sealing tape 16 and which project radially outward from the top of the sealing tape 16 and are elastically flexible transversely to the radial plane 26. They are preferably an integral part of the sealing tape 16.
  • the longitudinal ribs 44 assume an initial position. When threading into the clamping space 43, they are at least temporarily bent towards one another so that they fit into the narrower clamping space 43. In the interstice 43, they then press against the respectively assigned holding section 39 due to the elastic restoring force, so that a non-positive fixing takes place.
  • a form-fitting fixation in the sealing position can also take place, as is the case with the exemplary embodiment.
  • the longitudinal ribs 44 are undercut on the lateral outer surface 45 facing a respective holding section 39, the end region of the holding sections 39 being contoured in a complementary manner, so that the longitudinal ribs 44 and the holding sections 39 engage positively in the sealing position, for example in the manner of a dovetail connection.
  • the housing 2 and the holding strips 36, 36 ' are not formed in one piece, rather the holding strips 36, 36' are separate components. They are preferably detachably connected to the housing 2, so that a problem-free exchange can be carried out if necessary, for example in the event of wear. Their length corresponds to that of the longitudinal slot 8. They can each be formed in one piece or be composed of several parts arranged axially one after the other.
  • the holding strips 36, 36 ' are connected to the housing 2 by a snap or snap connection.
  • the fastening section 38 has at its free end a retaining rib 46 running in its longitudinal direction, which is clipped into a complementary receiving recess 47 on the housing side. It would also be conceivable to implement a positive connection in such a way that the fastening section 38 a housing section engages behind and is inserted into a corresponding housing groove on the front.
  • a screw connection would be recommended as another detachable connection type. If, on the other hand, one tends towards a connection that cannot be detached or can only be detached at greater expense, an adhesive connection would be recommended, for example.
  • an existing housing 2 can be equipped with suitably shaped holding strips 36, 36' according to the respective application. You can also easily take into account different width dimensions of the driver 14 or the holding section 35.
  • the mounting of the holding strips 36, 36 ' is very simple, since they can be attached from the outside radially and there is no need for manipulation in the longitudinal slot 8 itself.
  • the fastening sections 38 radially overlap the two slot walls 48 of the longitudinal slot 8 laterally and are fixed outside the longitudinal slot on the outer surface 12 (shown in broken lines at 52 in FIG. 4) or in a fastening recess 53 (FIG. 3) made in the outer surface 12. With the latter design, there is the advantage that the fastening sections 38 can be arranged recessed in the outer surface 12, so that their outer surface 54 does not protrude beyond the outer surface 12 and preferably merges flush with it.
  • the fastening recesses 53 shown by way of example are located in the transition area between the outer surface 12 and the outer surface 12 assigned slot wall 48, wherein they are formed by a gradation of the outer surface 12.
  • the above-mentioned receiving recess 47 is expediently part of the respectively assigned fastening recess 53.
  • the holding strips 36, 36 ' have the further advantage that they can perform a double function if required, by additionally functioning as guide strips 55, 55' for the driver 14.
  • the holding sections 39 can serve as guide sections 56 in the manner indicated in FIGS. 3 and 4, whose longitudinal sides facing the intermediate space 42 form or have guide surfaces 57 against which the driver 14 bears with its two side surfaces 58 and is in guide contact.
  • the driver 14 is thereby stabilized in its transverse position and it also avoids direct contact with the housing 2 made of metal, so that the wear is reduced.
  • suitable guide plates for example made of plastic, on the driver 14 itself. However, this could lead to a weakening of the driver width, which could result in a risk of breakage when transporting heavy loads.
  • the guide strips 55, 55 'can also be used without a mechanical holding function, so that it is only a question of guide strips for lateral guidance of the driver 14. This enables in particular the retrofitting of conventional linear drives, the sealing tapes of which do not have a suitable holding section 35.
  • the two holding strips 36, 36 ′ preferably protrude with their holding section 39 into the longitudinal slot 8 while maintaining a lateral distance from the respectively adjacent slot wall 48.
  • the dripping out can be triggered by temperature-related viscosity reduction, caused by the frictional heat in the contact area between the holding sections 39 and the driver 14.
  • the holding sections 39 are movable transversely to the radial plane 26, for example by being designed to be elastically bendable, a respective intermediate space 59 can also provide the necessary freedom of movement for this transverse movement. With such a configuration, the holding part 35 does not necessarily have to be transversely elastic.
  • the configuration can take place in such a way that the sealing tape 16 lies in the sealing position with its upper side against the free end sections of the holding sections 39.
  • it is considered to be more advantageous to provide a certain radial distance in the sealing position between the top of the sealing tape and the end region of the holding strips 36, 36 '.
  • the longitudinal slot 8 can have a slot widening 63 radially outward following the sealing contact surfaces 25 on the housing, a respective holding section 39 being able to be partially accommodated in the respective slot widening 63.
  • the side faces 64 of the holding sections 39 arranged in the longitudinal slot 8 and facing one another have an oblique course with respect to the radial plane 26.
  • the side faces 64 approach one another from radially outside to radially inside, so that the space 42 from the radially outer region to the sealing tape 16, in particular continuously narrowed.
  • the holding strips 36, 36 ' act as guide strips 55, 55', in such a configuration only the surface section of the side surfaces 64 assigned to the free end region of the holding section 39 will regularly act as a guide surface 57, as can be seen from FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Linear Motors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP95105983A 1994-06-28 1995-04-21 Entraínement linéaire Expired - Lifetime EP0690237B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9410393U DE9410393U1 (de) 1994-06-28 1994-06-28 Linearantrieb
DE9410393U 1994-06-28

Publications (2)

Publication Number Publication Date
EP0690237A1 true EP0690237A1 (fr) 1996-01-03
EP0690237B1 EP0690237B1 (fr) 1999-06-02

Family

ID=6910398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105983A Expired - Lifetime EP0690237B1 (fr) 1994-06-28 1995-04-21 Entraínement linéaire

Country Status (4)

Country Link
EP (1) EP0690237B1 (fr)
DE (2) DE9410393U1 (fr)
ES (1) ES2132457T3 (fr)
HU (1) HU214404B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0969213A3 (fr) * 1998-07-01 2002-04-03 Hygrama Ag Vérin à pression fluidique sans tige
EP0976930A3 (fr) * 1998-07-01 2002-04-03 Hygrama Ag Vérin à pression fluidique sans tige
DE102018201936A1 (de) 2018-02-08 2019-08-08 Festo Ag & Co. Kg Kolbenstangenloser Linearantrieb sowie Herstellungsbausatz und Mehrzahl von kolbenstangenlosen Linearantrieben

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10109482A1 (de) * 2001-02-28 2002-09-12 Festo Ag & Co Kolbenstangenloser Linearantrieb

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124878C1 (de) * 1981-06-25 1982-12-09 Kaiser, Siegmund H., Ing.(grad.), 7440 Nürtingen Druckmittelzylinder
EP0082829A1 (fr) * 1981-12-22 1983-06-29 AB Mecman Dispositif associé à un cylindre à pression de fluide sans tige de piston
EP0147803A2 (fr) * 1983-12-23 1985-07-10 Tol-O-Matic, Inc. Cylindre à pression
DE3429783A1 (de) * 1984-08-13 1986-02-20 Herion-Werke Kg, 7012 Fellbach Kolbenstangenloser zylinder
EP0260344A2 (fr) * 1986-09-17 1988-03-23 NORGREN MARTONAIR EUROPA GmbH Cylindre pour fluide sous pression
EP0345506A1 (fr) * 1988-06-08 1989-12-13 UNIVER S.p.A. Garniture d'étanchéité pour vérin pneumatique sans tige
DE3807786C2 (fr) * 1987-03-12 1992-04-16 Ckd Corp., Komaki, Aichi, Jp
EP0499687A1 (fr) * 1991-02-19 1992-08-26 Festo KG Vérin sans tige
EP0531131A1 (fr) * 1991-09-06 1993-03-10 Smc Corporation Vérin sans tige

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4400453C2 (de) * 1994-01-11 1996-11-07 Maschimpex Handels & Consulting Ag Linearantrieb
DE4400454C2 (de) * 1994-01-11 1996-11-07 Invest Tech Ag Kolbenstangenloser Linearantrieb

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124878C1 (de) * 1981-06-25 1982-12-09 Kaiser, Siegmund H., Ing.(grad.), 7440 Nürtingen Druckmittelzylinder
EP0082829A1 (fr) * 1981-12-22 1983-06-29 AB Mecman Dispositif associé à un cylindre à pression de fluide sans tige de piston
EP0147803A2 (fr) * 1983-12-23 1985-07-10 Tol-O-Matic, Inc. Cylindre à pression
DE3429783A1 (de) * 1984-08-13 1986-02-20 Herion-Werke Kg, 7012 Fellbach Kolbenstangenloser zylinder
EP0260344A2 (fr) * 1986-09-17 1988-03-23 NORGREN MARTONAIR EUROPA GmbH Cylindre pour fluide sous pression
DE3807786C2 (fr) * 1987-03-12 1992-04-16 Ckd Corp., Komaki, Aichi, Jp
EP0345506A1 (fr) * 1988-06-08 1989-12-13 UNIVER S.p.A. Garniture d'étanchéité pour vérin pneumatique sans tige
EP0499687A1 (fr) * 1991-02-19 1992-08-26 Festo KG Vérin sans tige
EP0531131A1 (fr) * 1991-09-06 1993-03-10 Smc Corporation Vérin sans tige

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0969213A3 (fr) * 1998-07-01 2002-04-03 Hygrama Ag Vérin à pression fluidique sans tige
EP0976930A3 (fr) * 1998-07-01 2002-04-03 Hygrama Ag Vérin à pression fluidique sans tige
DE102018201936A1 (de) 2018-02-08 2019-08-08 Festo Ag & Co. Kg Kolbenstangenloser Linearantrieb sowie Herstellungsbausatz und Mehrzahl von kolbenstangenlosen Linearantrieben
DE102018201936B4 (de) 2018-02-08 2023-01-26 Festo Se & Co. Kg Kolbenstangenloser Linearantrieb sowie Herstellungsbausatz und Mehrzahl von kolbenstangenlosen Linearantrieben

Also Published As

Publication number Publication date
HUT72335A (en) 1996-04-29
EP0690237B1 (fr) 1999-06-02
HU9501894D0 (en) 1995-08-28
HU214404B (hu) 1998-03-30
DE9410393U1 (de) 1994-08-18
ES2132457T3 (es) 1999-08-16
DE59506076D1 (de) 1999-07-08

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