EP2199624A1 - Actionneur linéaire fluidique avec unité de guidage - Google Patents

Actionneur linéaire fluidique avec unité de guidage Download PDF

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Publication number
EP2199624A1
EP2199624A1 EP08021868A EP08021868A EP2199624A1 EP 2199624 A1 EP2199624 A1 EP 2199624A1 EP 08021868 A EP08021868 A EP 08021868A EP 08021868 A EP08021868 A EP 08021868A EP 2199624 A1 EP2199624 A1 EP 2199624A1
Authority
EP
European Patent Office
Prior art keywords
guide
linear drive
drive according
piston rod
housing tube
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
EP08021868A
Other languages
German (de)
English (en)
Other versions
EP2199624B1 (fr
Inventor
Richard Buczek
Michael Pohunek
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
Priority to EP20080021868 priority Critical patent/EP2199624B1/fr
Publication of EP2199624A1 publication Critical patent/EP2199624A1/fr
Application granted granted Critical
Publication of EP2199624B1 publication Critical patent/EP2199624B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1471—Guiding means other than in the end cap
    • 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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps

Definitions

  • the invention relates to a fluid-actuated linear drive with guide unit, comprising a drive unit with a closed at the front by a front cover cover housing tube and axially slidably disposed in the housing tube, connected to a front end cap sealingly passing through the piston rod piston, and further comprising a guide unit with a arranged at the front of the drive unit guide body having two laterally opposite sides extending beyond the housing tube guide eyes with integrated linear guide means, which are interspersed by one by means of the guide body axially upstream yoke body connected to the piston rod guide rod.
  • Such a linear drive is in the product information " Guide units FEN / FENG for standard cylinders ", Edition 2008/04, pages 1 to 4 , the applicant described.
  • the known linear drive includes a drive unit in the form of a separate pneumatic cylinder, to the front of a guide unit is grown.
  • the guide unit has a guide body attached to the front end cover of the drive unit with lateral guide eyes, which are permeated by a respective guide rod slidable.
  • the piston rod stands with both guide rods by means a cheek body upstream of the guide body in a fixed connection, so that the guide rods join the linear movement of the piston rod which takes place during operation.
  • the yoke part is the power tap, and it can withstand very high lateral forces due to the guide unit.
  • the EP 0 346 716 B1 also describes a linear actuator with guide unit, the transverse support of the piston rod, however, takes place without separate guide rods and directly to the piston rod.
  • a guide body is mounted, which is equipped with linear guide means in the form of a rolling bearing assembly which acts on the piston rod for lateral support laterally.
  • Both known linear actuators have a relatively large length due to the upstream guide unit.
  • this is compensated in part by resorting to a substantially H-shaped guide body, in the rear recess of which the linear drive is immersed.
  • this requires a relatively complex structure of the guide body, which on the one hand has a negative impact on the manufacturing costs and on the other causes the linear drive has a very rugged outer contour, which is very difficult to clean. The latter impairs the usability in areas where hygiene requirements are high, for example in the food industry or in the field of pharmacy.
  • the front end cover is formed directly from the guide body, wherein these two components are components of a one-piece guide and end body.
  • the function of the end cover is taken over by the guide body, and vice versa.
  • the absence of independent components makes it possible to significantly reduce the overall length of the linear drive, which in turn opens up the possibility of realizing the guide and closing body as a geometrically simple body that can be easily manufactured and the overall arrangement to a total of easily accessible and therefore cleaning-friendly exterior surfaces helps.
  • the outer shape of the integral guide and end body is particularly recommended a block-shaped shape.
  • the body may have a rounded and / or beveled outer contour.
  • the guiding and closing body is expediently penetrated in the axial direction by three passage openings, by one - referred to as a piston rod passage opening - the piston rod passes, while the other two - referred to as guide rods-passage openings - are penetrated by one of the two guide rods.
  • the longitudinal axes of these three passage openings are expediently in a common plane.
  • leading and closing body that are arranged in the region of its front end of the mouths of the three passages in a common plane, which is expediently also applies to the rear of the guide and end body arranged orifices. These planes each extend at right angles to the longitudinal axis of the housing tube.
  • the front and rear opening mouths of the guide body are each at least substantially the same axial height, which allows a substantially rectilinear closure of the guide and closing body, without appreciably rugged contour of the respective associated end face.
  • the guiding and closing body does not axially overlap the housing tube in such a way that cleaning-unfriendly gaps result.
  • linear guide means are assigned to the externally accessible mouths of the associated openings scraper rings, which are held stationary on the guide and end body and slidably with a wiper lip on the outer circumference abut the respectively associated rod.
  • scraper rings also form a certain shielding with regard to cleaning liquid, with which the linear drive is sprayed from time to time when used in hygiene zones.
  • the scraper rings are easily releasably fixed, in particular in the context of a snap connection.
  • the linear drive can be easily converted with regard to the respective operating conditions.
  • the scraper rings can be customized and assembled. For example, for applications in which hardly any cleaning measures are carried out, it is possible to resort to inexpensive standard materials which require a constant amount of lubrication in order to maintain their optimum functionality.
  • the linear drive is intended for use requiring frequent cleaning, with the consequence of removing the lubricant, hard stripping materials are used, which meet the existing requirements even when running dry.
  • At least two different types of scraper rings which can alternatively be mounted on the guide and closing body, belong to the linear drive.
  • Some types of scraper rings have frontally, radially outside their wiper lip, an annular, axially open groove-like depression, which ensures the radial mobility of the wiper lip. So that too can not precipitate impurities, the groove-like depression is expediently filled with a rubber-elastic filling material, in particular consisting of a silicone material.
  • fastening screws which are introduced from the front into fastening channels of the guiding and closing body.
  • These attachment channels are in the region of the front end face of the guide and closing body suitably releasably closed by a respective sealing plug, which prevents penetration and deposition of impurities, but can also be easily removed to disassemble the linear drive.
  • a comparable shielding against deposition of impurities is expediently also in the connecting regions between the yoke body and the rods fixed thereto.
  • To attach the rods can fall back on fastening screws that pass through the yoke body, with their screw heads are received in blind hole-like depressions of the yoke body. These depressions can be releasably closed by cover caps, which also cover the heads of the mounting screws.
  • the guide and end body may have laterally opening mounting holes. Insofar as these are not used, plug screws are expediently screwed into them, which prevent the ingress of contaminants.
  • the total designated by reference numeral 1 linear drive comprises a rear-side drive unit 2 with longitudinal axis 3 and one of the drive unit 2 in the axial direction of the longitudinal axis 3 forwardly upstream guide unit 4. It includes a component of the guide unit 4, a guide body 5, at the same time the drive unit by also forming a front end cover 6 of the drive unit 2. Guide body 5 and end cover 6 are combined to form a one-piece unit, which is referred to as a guide and end body 7.
  • the drive unit 2 has a housing tube 8 which extends in the axial direction of the longitudinal axis 3 and is closed at the rear by a rear housing cover 12 and at the front by the already mentioned guide and closing body 7.
  • the rear housing cover 12 and the guide and end body 7 are each attached to the outer side of the housing tube 8 and screwed axially by fastening screws 13 with the housing tube 8.
  • the housing tube 8, the guide and end body 7 and the rear housing cover 12 define a housing chamber 14 in which a piston 15 serving for driving is slidably received.
  • the piston 15 is connected to a circumferential seal 16 fitted, which is in sealing contact with the peripheral surface of the housing chamber 14 defined by the housing tube 8, so that the housing chamber 14 through the piston 15 in a rear housing cover 12 facing rear working chamber 17 and the guide and end body 7 facing front Working chamber 18 is lower part.
  • a control channel 22 which passes through the rear housing cover 12 and the guiding and closing body 7, opens into each of the working chambers 17, 18 and allows a controlled fluid admission of the associated working chamber 17, 18 to the piston 15 to a by a double arrow 23rd to suggest indicated linear working movement in one direction or the other.
  • compressed air is used as drive fluid, but any other gaseous or liquid medium is also suitable.
  • a piston rod 24 is fixed, which passes through the front working chamber 18 and the adjoining, integrally formed guide and end body 7.
  • the guide and end body 7 directly forms the front boundary wall of the housing chamber 14 and the front working chamber 18 and is axially penetrated by a particular manner of a bore formed piston rod passage opening 25 through which the piston rod 24 passes.
  • the piston rod 24 carries the working movement 23 of the piston 15 and accordingly drives a Kraftabgriffselement 27, which is attached to the outside of the guide and end body 7 lying front end portion 32 of the piston rod 24.
  • guide rods 28 are present. They have expediently, like the piston rod 24, a circular cylindrical outer surface. Its cross section is expediently greater than that of the piston rod 24.
  • the guide rods 28 extend at a transverse distance parallel to the piston rod 24, the latter flanking alongside.
  • the rods are arranged overall so that their longitudinal axes extend in a common main plane 34.
  • the guide and end body 7 has, perpendicular to the longitudinal axis 3 and in this case measured parallel to the main axis 34, larger outer transverse dimensions than the housing tube 8. The latter is therefore seen when coinciding with the axial direction of the longitudinal axis 3 axial viewing direction of two lateral edge portions of Guide and end body 7 extends transversely to the longitudinal axis 3. These two edge portions are formed as guide eyes 35 each having a longitudinally extending guide rod passage opening 36. They project laterally toward opposite sides over the housing tube 8.
  • Each guide rod 28 passes through one of the guide rod through-openings 36 and is axially movably supported by linear guide means 37 arranged in the interior of the associated guide rod through-opening 36 and at the same time supported immovably on all sides in the radial direction.
  • linear guide means 37 come in the embodiment per guide rod 28, one or more serving for sliding bearing guide sleeves are used, which are anchored axially immovable in the guide rod passage opening 36.
  • the linear guide means 37 may also be designed as rolling bearing means.
  • the force tapping element 27 is expediently designed as a yoke body 42, via which the piston rod 24 is combined with the guide rods 28 to form a movement unit. It extends in front of the guide and end body 7 transversely to the longitudinal axis 3 and protrudes into the guide eyes 35 axially upstream areas. With their front end portions 43, the guide rods 28 are fixed axially immovably on the preferably plate-shaped yoke body 42.
  • the working movement 23 is thus always performed simultaneously by all the components of the piston 15, the piston rod 24, the yoke body 42 and the two guide rods 28 composed movement unit.
  • this movement unit will also be referred to below as the output unit.
  • the piston rod passage opening 25 is merely, in the region of their facing the yoke body 42 front end face of the integral guide and end body 7 ausmündenden front orifice 46, equipped with a piston rod 24 concentrically enclosing scraper ring 48, and with an axially back to the Scraper ring 48 coaxially adjoining sealing ring 52.
  • the sealing ring 52 has a front of the working chamber 18 facing the sealing lip, which rests against the outer peripheral surface of the piston rod 24 and thus prevents fluid leakage through the piston rod passage opening 25 therethrough.
  • the scraper ring 48 has a forwardly oriented annular scraper lip 53 which also abuts all around the outer surface of the piston rod 24 and abrades when retracting the piston rod 24 at this adhering contaminants. As a result, the seal ring 52 is protected from excessive wear.
  • sealing ring 52 and the scraper ring 48 are combined to form a particular one-piece unit.
  • leading and closing body 7 is designed block-shaped. He expediently has an elongated cross-section, with larger cross-sectional dimensions in the main plane 34 than at right angles thereto. In the region of the two guide eyes 35, it is particularly bevelled on the outside (at 54) and rounded (at 55), so that its cross-section expediently tapers towards the outer end sections of the guide eyes 35. This saves material and further improves ease of cleaning.
  • the guide and end body 7 is formed not only peripherally, but also front and rear smooth and ungangled, which simplifies the production and cleaning.
  • the guide eyes 35 do not protrude backwards beyond the joining area 59 located between the housing tube 8 and the guide and end body 7.
  • a further scraper ring 64 is expediently arranged in the region of each front orifice 47 and rear orifice 62 of the guide rod passages 36. It is fixed to the guide and end body 7 and surrounds the guide rod 28 with sliding contact.
  • scraper rings 46, 64 are installed throughout which require reliable interaction with a sufficiently greased surface for reliable and low-wear operation. With them, the linear drive 1 is equipped in cases where no particularly intensive cleaning has to take place or in which is cleaned with means that cause no detachment of the usually located on the piston rod 24 and on the guide rods 28 greasy film.
  • the scraper rings 46, 64 consist here in particular of a material with rubber-elastic properties.
  • Such a scraper ring 65 consists of a relatively hard plastic material, in particular a hard PE plastic material, which is also suitable for a scraper function in connection with ungreased surfaces.
  • the linear drive 1 can be converted very easily with respect to the respective applications by replacing the existing scraper rings 46, 64 with the other type of scraper rings 65.
  • Abstreiferringen 46, 64, 65 are anchored in the context of detachable snap on the guide and end body 7.
  • the Abstreiferringe 46, 64, 65 simply buttoned so that they engage behind a radially inwardly projecting annular mounting collar 66 of the guide and end body 7 or embrace.
  • scraper rings as exemplified by the scraper ring 48 in Fig. 8 are illustrated, have on their outwardly facing end face on a wiper lip 53 enclosing groove-like recess 68. So that no impurities can be deposited in this, it can with an in Fig. 8 be filled below the longitudinal axis 3 indicated rubber elastic filling material 72.
  • This filling compound 72 adheres in particular by material connection. It is in particular a silicone material.
  • the above-mentioned attachment of the rods 24, 28 on the yoke body 42 is effected in particular by using in each case a fastening screw 73.
  • the rods 24, 28 abut with the end face of its front end portion 32, 43 to the preferably flat rear end face 74 of the yoke body 42 and have an axial internal thread 76, in which the associated fastening screw 73 is screwed in from the front, which in this case passes through the yoke body 42 and this tensioned by its head 77 against the end face of the associated rod 24, 28.
  • additional measures are provided which ensure a closed surface on the front end face 75 of the yoke body 42.
  • These measures consist of a head 77 receiving blind hole-like recess 78 which is closed by a flush to the front end surface 75 cap 81.
  • the cap 81 may also be fixed in other ways. Appropriately, a releasable attachment to disassemble the linear actuator 1 when needed can.
  • the fastening screws 18 used for the mutual connection of guide and end body 7 and housing tube 8 are from the front side in the wall of the housing tube 8 screwed. So that they can be formed as short as possible even with a larger overall length of the guide and end body 7, they are expediently used in each one the guide and end body 7 axially penetrating mounting channel 82.
  • the cross section of the fastening channel 82 corresponds at least to the cross section of the head of the fastening screw 13, wherein the mouth of the fastening channel 82 is narrowed in the region of the rear end face 45 by a radial projection 83, which allows a passage of the screw shaft, but not the screw head.
  • the screw head of the fastening screw 13 is supported on the radial projection 83 and presses over the guide and closing body 7 against the facing end face of the housing tube eighth
  • the front channel openings open to the front end face 44 of the guiding and closing body 7 are expediently detachably closed by a screw plug 84.
  • the stopper 84 in Fig. 1 not shown and in Fig. 3 only in the region of one of the attachment channels 82.
  • the other attachment channels 82 are shown here with an open mouth.
  • the sealing plug 84 can be removed, so that a screwing tool can be introduced into the fastening channel 82.
  • the guide and end body 7 has a total of four arranged in the corners of a square mounting channels 82, each receive a mounting screw 13.
  • the guide and end body 7 is provided with laterally opening mounting holes 85, which are expediently provided with an internal thread.
  • the fastening bores 85 lead to the two outer surface sections of the guide and end body 7 situated on this side and beyond the main plane 34.
  • Those mounting holes 85 that are not needed, are closed by screwing in screw plugs 86 pollution-proof.
  • a screw plug 86 shown in the assembled state by way of example.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP20080021868 2008-12-17 2008-12-17 Actionneur linéaire fluidique avec unité de guidage Active EP2199624B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20080021868 EP2199624B1 (fr) 2008-12-17 2008-12-17 Actionneur linéaire fluidique avec unité de guidage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080021868 EP2199624B1 (fr) 2008-12-17 2008-12-17 Actionneur linéaire fluidique avec unité de guidage

Publications (2)

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EP2199624A1 true EP2199624A1 (fr) 2010-06-23
EP2199624B1 EP2199624B1 (fr) 2012-06-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011121023A1 (de) 2011-12-13 2013-06-13 Festo Ag & Co. Kg Lineareinheit mit Linearführungsmitteln und Verfahren zur Herstellung einer Führungsstange der Linearführungsmittel
CN103334982B (zh) * 2013-07-10 2015-06-24 徐州徐工液压件有限公司 一种伸缩油缸和起重机
CN117345726A (zh) * 2023-11-03 2024-01-05 无锡市浦尚精密机械有限公司 一种液压油缸导向装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014017976B3 (de) * 2014-12-04 2016-03-31 Festo Ag & Co. Kg Führungssystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1552859A1 (de) 1966-03-11 1970-01-29 Blatt Leland F Vorrichtung fuer die Lageanordnung und Betaetigen eines Werkzeughalters
US3877348A (en) * 1971-08-09 1975-04-15 William C Sandlin Linear thruster
EP0124727A2 (fr) * 1983-04-06 1984-11-14 Robert Bosch Gmbh Cylindre de travail
EP0346716B1 (fr) 1988-06-15 1992-09-02 EXPERT Maschinenbau GmbH Vérin à tige de piston immobilisée en rotation
JPH07110012A (ja) * 1993-10-12 1995-04-25 Smc Corp サーボシリンダ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1552859A1 (de) 1966-03-11 1970-01-29 Blatt Leland F Vorrichtung fuer die Lageanordnung und Betaetigen eines Werkzeughalters
US3877348A (en) * 1971-08-09 1975-04-15 William C Sandlin Linear thruster
EP0124727A2 (fr) * 1983-04-06 1984-11-14 Robert Bosch Gmbh Cylindre de travail
EP0346716B1 (fr) 1988-06-15 1992-09-02 EXPERT Maschinenbau GmbH Vérin à tige de piston immobilisée en rotation
JPH07110012A (ja) * 1993-10-12 1995-04-25 Smc Corp サーボシリンダ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Produktinformation", April 2008, pages: 1 - 4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011121023A1 (de) 2011-12-13 2013-06-13 Festo Ag & Co. Kg Lineareinheit mit Linearführungsmitteln und Verfahren zur Herstellung einer Führungsstange der Linearführungsmittel
CN103334982B (zh) * 2013-07-10 2015-06-24 徐州徐工液压件有限公司 一种伸缩油缸和起重机
CN117345726A (zh) * 2023-11-03 2024-01-05 无锡市浦尚精密机械有限公司 一种液压油缸导向装置

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