EP1492959B1 - Fluidbetätigter linearantrieb - Google Patents

Fluidbetätigter linearantrieb Download PDF

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Publication number
EP1492959B1
EP1492959B1 EP03745768A EP03745768A EP1492959B1 EP 1492959 B1 EP1492959 B1 EP 1492959B1 EP 03745768 A EP03745768 A EP 03745768A EP 03745768 A EP03745768 A EP 03745768A EP 1492959 B1 EP1492959 B1 EP 1492959B1
Authority
EP
European Patent Office
Prior art keywords
housing
linear drive
drive according
chamber
chambers
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
EP03745768A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1492959A1 (de
Inventor
Kurt Stoll
Manfred Moritz
Steffen Sailer
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 EP1492959A1 publication Critical patent/EP1492959A1/de
Application granted granted Critical
Publication of EP1492959B1 publication Critical patent/EP1492959B1/de
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
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • 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
    • F15B15/1438—Cylinder to end cap assemblies
    • 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
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • 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

Definitions

  • the invention relates to a fluid-actuated linear drive, with a drive housing in which at least one longitudinally extending housing chamber is located, in which at least one linearly displaceable piston is arranged, which is coupled in motion with a Kraftabgriffsteil having at least one accessible outside of the drive housing Kraftabgriffsabterrorism, wherein the drive housing has two adjacent housing parts, which are provided at the mutually facing joining surfaces with elongated, groove-like depressions formed half chambers, which complement each other to the at least one housing chamber.
  • a known from US-B1-6 308 614 fluid-actuated linear actuator of this type has an elongated drive housing, which consists of a tubular center piece and end capped end caps, wherein the center defines a cylindrical housing chamber in which a fluidizable by a linear movement drivable piston is housed.
  • One or more drive parts connected to the piston engage through one or more longitudinal slots of the middle piece, so that the movement of the piston can be tapped on a force tapping section which is accessible outside the drive housing and is designed as a slide table.
  • the middle piece is divided longitudinally and consists of two juxtaposed housing parts which together define the housing chamber.
  • Linear actuators are also known, for example from US Pat. No. 5,514,961, in which the force-tapping portion connected to the piston is formed by a piston rod which passes through a cover plate of the drive housing upstream of the center piece.
  • the middle piece consists of a tubular body.
  • linear drives have the disadvantage that they have reached a certain limit in terms of reducing the cost of production, which can hardly be exceeded. This applies in particular to embodiments which are equipped with operationally specific functional elements in the course of the increasing integration desire of the customers, for example with sensor means or with. Valve means.
  • the fluid-actuated linear drive according to the invention is designed as a piston rod linear drive whose Kraftabgriffsteil is formed as a piston connected to the piston rod, which projects through one of the housing chamber axially upstream passage opening from the drive housing, wherein the passage opening of two complementary passage opening halves is formed on the mutually facing joining surfaces of the two housing parts.
  • the housing chamber accommodating the at least one piston continues to be composed of two half chambers, each defining half the circumference, which have been formed on the joining surfaces prior to the assembly of the two housing parts. Since the joining surfaces are easily accessible before assembly of the housing parts, the desired shape of the housing chamber can be given very flexible by appropriate design of the half chambers.
  • the linear drive is designed as a piston rod linear drive, thus representing a so-called working cylinder, in which the external force is applied to at least one protruding from the drive housing piston rod.
  • the passage opening enabling the passage of the piston rod is likewise defined by two complementary passage opening halves on the mutually facing joining surfaces of the two housing parts, comparable to the construction of the housing chamber.
  • the running surface for the piston can be formed directly from the wall of the housing chamber.
  • the housing chamber in particular made of stainless steel liner, which defines the tread for the piston.
  • Such a liner can be a simple tubular body, the can be easily and inexpensively manufactured with higher precision.
  • one or more cavities jointly defined by the two housing parts are expediently formed, which can serve the most varied purposes as required.
  • the cavities especially in elongated training, act as fluid channels and / or as electrical conduction channels.
  • receiving chambers can be defined in which valve means and / or sensor means or other operationally relevant functional components are placed.
  • the other functional components are, for example, electronic components, for example as part of control electronics, or light-emitting means for visualizing certain operating states of the linear drive.
  • valve means As far as valve means are placed in designated cavities, it may be functionally finished valves from the house, which are used in a cartridge-like manner in the cavity concerned. Alternatively, however, it can also be provided that the two housing parts directly the valve housing form at least one valve, so that only the functional components of the valve must be used in the corresponding cavity.
  • a comparable structure of a control valve is already known from EP 0 6438 11 B1, but not the integration in the drive housing of a linear drive, wherein one and the same housing parts form both the drive housing and at least one valve housing.
  • the shape of the housing parts of the drive housing can be based on the particular application.
  • fastening means may be provided on the outer surface, which allow attachment of the linear drive itself or the fixation of additional components, for example of sensors or valves.
  • linear drives which have a plurality of drive units each containing a housing chamber with associated piston.
  • tandem drives can be realized.
  • the linear drive has a drive housing 1, which consists of two longitudinally juxtaposed and firmly interconnected elongated housing parts, which are referred to below as the first housing part 2 and the second housing part 3.
  • a drive housing 1 In the interior of the drive housing 1 there is at least one longitudinal housing housing chamber 4, wherein the figures 1 to 4 show a design with a housing chamber 4 and Figure 5 shows a design with two parallel juxtaposed housing chambers 4.
  • the housing chamber 4 is cylindrical and preferably circular cylindrical.
  • each housing chamber 4 is a longitudinally linearly movable piston 5.
  • the piston 5 divides the housing chamber 4 axially into two working spaces, which are referred to below as the first working space 6a and second working space 6b.
  • the working spaces are controlled with a fluidic pressure medium, in particular with compressed air, acted upon to drive the piston 5 to a linear movement or to position in certain positions.
  • the linear movement of the piston 5 can be tapped on an accessible outside of the drive housing 1 Kraftabgriffsabêt 7 of a movement-coupled with the respective piston 5 Kraftabgriffsteils 8.
  • the linear actuators of the embodiment are piston rod linear actuators - also referred to as working cylinder, whose Kraftabgriffsteil 8 is formed by a piston rod 12, which passes through a first working space 6a frontally final first housing-mounted end wall 13a.
  • the first end wall 13a is like the oppositely disposed, the second working space 6b frontally terminating second end wall 13b preferably integral part of the drive housing 1.
  • On its way to the outside passes through the piston rod 12 of the housing chamber 4 coaxially upstream passage opening 14 in the region of the first end wall 13a ,
  • the linear drive could also be designed as a rodless linear drive. Furthermore, a plurality of axially successive pistons could be accommodated in a respective housing chamber 4.
  • the two housing parts 2, 3 are laterally attached to each other in a joining region 15, wherein a first joining surface 16 of the first housing part 2 comes to rest on a second joining surface 17 of the second housing part 3.
  • each joining surface 16, 17 is formed as a first and second half-chamber 18a, 18b, elongated trough-shaped recess formed.
  • the two identically formed half chambers 18a, 18b face each other at the same height, so that they complement each other to the relevant housing chamber 4.
  • each half-chamber 18a, 18b has the shape of one half of a centrally longitudinally cut through cylinder.
  • the passage opening 14 for the piston rod 12 is formed by two complementary passage opening halves 22a, 22b, which are formed axially adjacent to a respective half chamber 18a, 18b in the associated joining surface 16, 17.
  • the two housing parts 2, 3 are preferably made of plastic material by plastic processing measures, wherein in the shaping directly the half chambers 18a, 18b and passage opening halves 22a, 22b are formed.
  • the production is carried out by casting, in particular by injection molding.
  • the plastic foaming technique For medium quantities, it is expedient to resort to the plastic foaming technique.
  • the plastic material used may be reinforced by embedded glass fibers and / or metal particles.
  • the solid connection is preferably achieved by gluing or by welding the joining surfaces. This can be dispensed with between the joining surfaces 16, 17, additional sealing means.
  • the welded connection can be produced for example by laser beam welding or by ultrasonic welding.
  • the piston 5 Before joining the two housing parts 2, 3, however, the piston 5 is still placed with the piston rod 12 in the drive housing.
  • the running surface for the piston 5 is formed directly from the wall of the receiving housing chamber 4.
  • Such a design is characterized by a particularly small number of components, but is recommended only for precision-connected housing parts 2, 3, so that no joints occur during the transition of the peripheral wall sections of the half chambers 18a, 18b, which could cause any leaks.
  • the running surface for the piston 5 is located on the inner surface of a separately inserted into the housing chamber 4 bushing 23. This is thus coaxial between the piston 5 and the peripheral wall of the housing chamber. 4
  • the bushing 23 is an easily manufactured tubular body, which consists in particular of stainless steel and has very good sliding properties. As a result, a low-friction displacement movement of the voltage applied to its inner surface piston 5 can be ensured.
  • additional sealing means should be provided which prevent around the bushing 23 around a fluid transfer between the two working spaces 6a, 6b.
  • the bushing 23 is enclosed at each end portion by an annular seal 24 which seals between the outer periphery of the bushing 23 and the inner periphery of the housing chamber 4.
  • the bushing 23 is expediently installed in already placed on them seals 24 in the drive housing 1.
  • a piston rod 12 coaxially enclosing bearing bushing 21 is inserted into the passage opening 14. Furthermore, in the passage opening 14, the piston rod 12 is placed coaxially enclosing annular sealing and / or stripping means 25.
  • first and second position securing means 26a, 26b which are complementary to one another are provided on the two joining surfaces 16, 26, which engage one another in a form-fitting manner in the attached state of the two housing parts 2, 3. Conveniently, they are related complementary protrusions and depressions.
  • the position securing means 26a, 26b prevent relative movements of the housing parts 2, 3 in the joining plane.
  • the position securing means 26a, 26b are formed in the prototyping of the housing parts 2, 3.
  • the only covered recesses 31a are designed in the embodiment of a groove and serve to realize fluid channels 32 and electrical cable ducts 33.
  • the cavities 27 formed by recessed pairs are in the embodiment receiving chambers 34 for controlling the linear drive serving electrical valve means 35 and for detecting operating conditions of the Linear drive serving sensor means 36.
  • the sensor means 36 are formed as a function of the parameters to be detected.
  • the exemplary embodiment concerns position sensor means, for example in the form of so-called cylinder switches, or a displacement measuring system.
  • the receiving chambers 34 for the sensor means 36 are preferably located alongside the associated housing chamber 4.
  • FIG. 3 shows receiving chambers 34 for functional components 37 provided in the region of the second end wall 13 in the form of light-emitting means which emit a light signal for certain piston positions. 5
  • a receiving chamber 34 for receiving functional components 37 is provided, wherein the functional components 37 consist of electronic components that can define an electronic control device and / or a fieldbus station.
  • the mentioned fluid channels 32 are those which connect a provided on the outer surface of the drive housing 1 connection opening 38 with the two working spaces 6a, 6b.
  • the electric valve means 35 are turned on, which are able to connect on the basis of electrical control signals received the respective associated working space 6a and 6b optionally with the connection opening 38 or with a vent opening 42.
  • control valves with 3/2-valve functionality.
  • the valve means 35 may be according to Figures 1 to 4 switching valve means or also Stetigventilstoff, as is the case with the linear drive of Figure 5.
  • the receiving chambers 34 provided for receiving the valve means 35 are located on the rear side of the respective associated housing chamber 4 in the second end wall 13 provided there, thereby providing a relatively slim design, despite a plurality of drive units arranged parallel to one another be guaranteed.
  • a particularly low material requirement for the housing parts 2, 3 results when they are, at least in the region of the half chambers 18a, 18b, each half-shell-like, as is well visible in Figure 2.
  • a relatively thin-walled drive housing 1 results.
  • valve means 35 are used, which are total independent valves, which would also be functional outside the accommodating receiving chamber 34 and which are placed like a cartridge in the respective receiving chamber 34. These valve means 35 each have their own valve housing.
  • Deviating from Figure 5 illustrates that also designs are possible in which the valve housing of the valve means 35 is formed directly from the drive housing 1. In each of the receiving chambers 34 defined by the drive housing 1, only the functional components of the relevant valve are seated, without a separate valve housing. The construction can correspond to that which is explained in EP 0 643 811 B1.
  • the electrical leads 43 which supply the electrical connection of the sensor means 36, the valve means 35 and any other electrical functional components are routed. They expediently lead to a common electromechanical connection device 44 on the outside of the drive housing 1, to which a cable leading to a non-illustrated external electronic control device can be connected.
  • damping chambers 45 may be formed, which are composed of pairs complementary damping chamber halves of the two joining surfaces 16, 17. They allow a pneumatic cushioning of the piston 5, which is equipped at both ends with a damping piston 47 which can dip into the associated damping chamber 45.
  • the usual Abströmweg for the pressure medium is blocked by cooperation with an annular seal 48, so that it can only flow out through fluid channels 32, in which an adjustable throttle device 48 is turned on.
  • throttle devices 52 serving for regulating the speed can be provided, which are connected upstream of the vent openings 42.
  • All throttle devices 48, 52 are placed in the embodiment in formed on the housing parts 2, 3 receiving recesses 53, which may be formed at any suitable location of the drive housing 1. Conveniently, they are located on the same side of the drive housing. 1
  • All depressions of the joining surfaces 16, 17 and preferably also the other receiving recesses and / or channels are preferably formed directly during the primary molding of the housing parts 2, 3.
  • the procedure is such that all components to be installed in the joining region 15 are placed exclusively in one of the housing parts before assembly, so that subsequently the bare housing part only has to be placed.
  • any fastening means can be formed as required to fasten required components for operation, for example, further sensor means for interrogation of intermediate positions.
EP03745768A 2002-04-09 2003-03-20 Fluidbetätigter linearantrieb Expired - Lifetime EP1492959B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10215482 2002-04-09
DE10215482A DE10215482B4 (de) 2002-04-09 2002-04-09 Fluidbetätigter Linearantrieb
PCT/EP2003/002906 WO2003085272A1 (de) 2002-04-09 2003-03-20 Fluidbetätigter linearantrieb

Publications (2)

Publication Number Publication Date
EP1492959A1 EP1492959A1 (de) 2005-01-05
EP1492959B1 true EP1492959B1 (de) 2007-01-03

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ID=28684832

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EP03745768A Expired - Lifetime EP1492959B1 (de) 2002-04-09 2003-03-20 Fluidbetätigter linearantrieb

Country Status (5)

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US (1) US7055423B2 (pt)
EP (1) EP1492959B1 (pt)
AT (1) ATE350587T1 (pt)
DE (2) DE10215482B4 (pt)
WO (1) WO2003085272A1 (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005055554B4 (de) * 2005-11-18 2012-07-12 Ab Skf Vorrichtung
DE102006011156A1 (de) * 2006-03-10 2007-09-13 Robert Bosch Gmbh Stellvorrichtung
US8177524B1 (en) * 2008-08-19 2012-05-15 Wagner Spray Tech Corporation Manual locking clamp for piston paint pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3900599A1 (de) * 1989-01-11 1990-07-12 Schoenbohm Hans Peter Linearfuehrungssystem und dafuer geeignetes zylinderrohrlaengenmaterial

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533485B2 (pt) * 1974-05-09 1980-09-01
AU672954B2 (en) * 1991-07-12 1996-10-24 Denne Developments Limited Electromagnetic apparatus for producing linear motion
US5222715A (en) * 1992-06-01 1993-06-29 Mead Fluid Dynamics, Inc. Valve construction
DE4334811A1 (de) * 1993-10-13 1995-04-20 Festo Kg Positionserfassungsvorrichtung an einem Linearantrieb
ATE155853T1 (de) * 1993-03-19 1997-08-15 Zindel Consulting Fluidbetätigter arbeitszylinder mit integrierten stell- und steuergliedern
US6308614B1 (en) * 1999-05-26 2001-10-30 Howa Machinery, Ltd. Actuator device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3900599A1 (de) * 1989-01-11 1990-07-12 Schoenbohm Hans Peter Linearfuehrungssystem und dafuer geeignetes zylinderrohrlaengenmaterial

Also Published As

Publication number Publication date
DE10215482A1 (de) 2003-11-06
EP1492959A1 (de) 2005-01-05
ATE350587T1 (de) 2007-01-15
US7055423B2 (en) 2006-06-06
WO2003085272A1 (de) 2003-10-16
DE10215482B4 (de) 2004-05-06
DE50306186D1 (de) 2007-02-15
US20050066811A1 (en) 2005-03-31

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