EP1225343A1 - Dispositif d'entrainement par vérin à pression fluidique - Google Patents

Dispositif d'entrainement par vérin à pression fluidique Download PDF

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Publication number
EP1225343A1
EP1225343A1 EP01118584A EP01118584A EP1225343A1 EP 1225343 A1 EP1225343 A1 EP 1225343A1 EP 01118584 A EP01118584 A EP 01118584A EP 01118584 A EP01118584 A EP 01118584A EP 1225343 A1 EP1225343 A1 EP 1225343A1
Authority
EP
European Patent Office
Prior art keywords
piston rod
piston
drive device
cylinder
fluid
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.)
Withdrawn
Application number
EP01118584A
Other languages
German (de)
English (en)
Inventor
Kurt Dr. Stoll
Herbert Köngeter
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 EP1225343A1 publication Critical patent/EP1225343A1/fr
Withdrawn legal-status Critical Current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
    • F15B15/17—Characterised by the construction of the motor unit of the straight-cylinder type of differential-piston type
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies

Definitions

  • the invention relates to a drive device with a can be actuated by fluid force and in particular pneumatically Working cylinder is equipped.
  • Drive devices of this type are in various forms known. They regularly contain one with one Cylinder housing equipped working cylinder, the cylinder housing contains a piston with a one Force attack enabling piston rod is connected.
  • the Piston divides the interior of the cylinder housing into two Cylinder chambers that alternate with an actuating fluid can be acted upon or vented to the piston and Piston rod existing drive unit for a lifting movement drive.
  • Working cycles can be realized that an extension movement and an adjoining one Assemble the entry movement.
  • a control valve is assigned to each cylinder chamber, with which the fluid exposure or Can influence ventilation.
  • a drive device which contains a working cylinder which can be actuated by fluid force and which has a drive unit with a piston arranged in the cylinder housing and a piston rod connected to the piston and protruding from the cylinder housing on one end face, the piston having two for acting on one Actuating fluid provided cylinder chambers from each other, the piston rod has at least at its longitudinal section located within the associated cylinder chamber a cross-sectional area A, which is between 35% and 80% of the application area B 1 of the drive unit on the rodless side of the piston, and wherein the piston rod made of aluminum material with a tensile strength of at least 300 N / mm 2 .
  • the working cylinder can be operated with an integrated fluid spring, with particular consideration being given to pneumatic applications in which an air spring is present.
  • the cylinder chamber on the piston rod side is exposed to a constant exposure to fluid and only the opposite cylinder chamber without piston rod is acted upon by fluid in a valve-controlled manner, or is relieved or vented.
  • the differential force that forms when the fluid is applied causes the drive unit to move out quickly, while the subsequent actuation of the rodless cylinder chamber causes the actuation pressure in the cylinder chamber on the piston rod side to cause the drive-in movement.
  • a convenient measure is the cylinder to be equipped with a piston rod whose surface hardness Rockwell is over 40 HRC. There is an associated high wear resistance even at high working speeds. These values can be achieved, for example, with a Aluminum piston rod that has an anodized surface has and in particular has a sliding anodizing layer.
  • the cavity can if necessary, be provided with an internal thread that the Attaching a component allows, for example one Coupling piece or an object to be moved.
  • the control means exist here expediently from a single 3/2-way valve, which in the fluid connection between a pressure source and the piston rodless Cylinder chamber is turned on.
  • the means for constant fluid application on the piston rod side Cylinder chamber can be made between a pressure source and the fluid line running on the piston rod side of the cylinder chamber exist, preferably on a separate Pressure accumulator is dispensed with.
  • the resilient effect can therefore at least partially from the pressure increase of the connected Fluid line network when displacing the actuating fluid from the constantly pressurized cylinder chamber originate.
  • the configuration is expediently such that the two cylinder chambers are always under pressure are under the same actuation pressure. In this way is a connection to a common pressure source without any special Pressure regulation or reduction measures possible.
  • the measures according to the invention have particular advantages in connection with a working cylinder operated with compressed air, a so-called pneumatic cylinder.
  • the drive device denoted generally by reference number 1 contains a through as the main component Fluid power operated cylinder 2.
  • the fluid power is supplied by an actuating fluid that has a suitable Pressure source P is provided.
  • compressed air is provided as the actuating fluid, so that the working cylinder 2 is a pneumatic cylinder is.
  • the working cylinder 2 has a cylinder housing 3 with a cylinder tube 4, the rear through an end cover 5 and completed on the front by a bearing cover 6 is.
  • the covers are on the end of the cylinder tube 4 attached, but can also wholly or partially in the cylinder barrel 4 be used.
  • One-piece training too the cylinder tube 4 and at least one cover is possible.
  • the cylinder housing 3 delimits a receiving space inside 7, in which a piston 8 axially in the direction of the longitudinal axis 9 is slidably received.
  • the piston 8 carries in the area of the outer circumference a concentrically arranged annular Seal 12, which seals with the cylindrical inner surface of the recording room 7 cooperates. That way the receiving space 7 in two axially successive cylinder chambers 13, 14 divided.
  • a piston rod 15 fixedly connected to the piston 8 extends starting from the piston 8 towards the bearing cover 6, which they can be moved in the area of an opening 16 and penetrated sealed.
  • One of them for example Bearing bush formed annular bearing device 17 is in the Area of the opening 16 fixed on the bearing cover 6 and encloses the piston rod 15 with guide contact.
  • the piston rod 15 of a particular formed as a lip seal ring-shaped sealing device 18 enclosed, also on the bearing cap 6 is fixed. Both the bearing device 17 and the Sealing device 18 are advantageously within the Opening 16 placed and can be used as a unit if necessary be trained.
  • Fastening bolt 22 is provided for the connection between the piston 8 and the piston rod 15 . Its diameter is less than that of the piston rod 25, and it penetrates the piston 8 in the area of a central opening.
  • a spacer 23 On the end of the fastening bolt opposite the piston rod 15 22 is, advantageously with interposition a spacer 23, a fastening nut 24 screwed on, so that the piston 8 between the piston rod 15 and the fastening nut 24 is firmly clamped.
  • the piston rod 15 could also be in a different way on the piston 8 be attached, and would also be a one-piece design possible.
  • a separate fluid channel opens into each cylinder chamber 13, 14 26, 27, on the other hand via a connection opening 28, 29 opens out to the outer surface of the cylinder housing 3.
  • Actuating fluid fed in via the rear fluid channel 27 enters that cylinder chamber 14 which is not penetrated by a piston rod 15 and is referred to below as a rodless cylinder chamber 14.
  • the actuating fluid is then able to act on the end face of the drive unit 25 which delimits the rodless cylinder chamber 14 and which is referred to as the first action area B 1 .
  • it is composed of the end faces of the piston 8 which are oriented opposite to the piston rod 15 and the spacer 23, the fastening nut 24 and the fastening bolt 22.
  • the first actuating surface becomes B 1 is formed entirely by the piston surface facing away from the piston rod 15.
  • the first application area B 1 is defined by the area which is delimited by the outer contour of the piston 8.
  • the transverse extent of the first application area B 1 is additionally indicated by a double arrow.
  • the actuating fluid that is fed through the front fluid channel 16 into the cylinder chamber, which is penetrated by the piston rod 15 and is referred to below as the piston rod-side cylinder chamber 13, can, due to the piston rod 15 occupying a central region of the piston rod-side cylinder chamber 13, only act on a second application area B 2 , which is smaller than the axially oppositely oriented first application surface B 1 .
  • This second application surface B 2 is an annular surface, the outer contour of which is defined by the outer contour of the piston 8 and the inner contour of which is defined by the outer contour of the piston rod 15.
  • the second application area B 2 is marked by two double arrows for clarification.
  • Both the piston 8 and the piston rod 15 are preferably provided with a circular outer contour, so that the first application surface B 1 is a circular surface and the second application surface B 2 is an annular surface.
  • different contours would also be possible.
  • the piston 8 could have a non-circular outer contour have, preferably oval or elliptical or flat with rounded narrow sides.
  • the piston rod could also be non-circular contoured, for example square.
  • the size of the second application area B 2 depends on the size of the cross-sectional area A marked by a double arrow of the length section 35 of the piston rod 15 currently located within the cylinder chamber 13 on the piston rod side. It should be mentioned that the piston rod 15 expediently has a constant cross section over the entire length.
  • the cross-sectional area A of the piston rod 15 in an order of magnitude that is between 35% and 80% of the first application area B 1 . Accordingly, the size of the second application area B 2 is in a range between 65% and 20% of the first application area B 1 . The range limits of the percentages are included in each case.
  • a cross-sectional area A of the piston rod 15 in the range between 40% and 70%, in each case including the range limits, of the first application area B 1 has proven to be optimal.
  • the working cylinder 2 enables use as an air spring cylinder.
  • the cylinder chamber 13 on the piston rod side is constantly connected to the pressure source P via a first fluid line 32 connected to the front fluid channel 26 and is exposed to the operating pressure, which is, for example, in the order of 6 bar.
  • the operating pressure which is, for example, in the order of 6 bar.
  • the drive unit 25, in conjunction with the second application surface B 2 experiences a constant restoring force F R in the direction of entry, that is to say in the sense of an approach of the drive unit 25 to the end cover 5 on the rear side 13.
  • Common fluid line cross-sections are used here, an additional pressure accumulator is not switched on, as is the installation of a pressure reducer or pressure regulator.
  • the rodless cylinder chamber 14 is connected to the rear fluid channel 27 connected second fluid line 33 also connected to a pressure source P, whereby it is preferably the same pressure source with which also the piston rod-side cylinder chamber 13 in constant Connection is established.
  • a pressure source P is preferably the same pressure source with which also the piston rod-side cylinder chamber 13 in constant Connection is established.
  • a 3/2-way valve in the second fluid line 32 34 turned on, as a control means for the controlled Acting and relieving or venting the rodless cylinder chamber 14.
  • the 3/2-way valve which can be activated in particular electrically and in this case preferably electromagnetically or piezoelectrically, can optionally assume a ventilation switching position or an actuation switching position which can be seen in the drawing.
  • a ventilation switching position the connection between the rodless cylinder chamber 14 and the pressure source P is interrupted and the rodless cylinder chamber 14 is vented to the atmosphere.
  • the drive unit 25 consequently assumes the retracted position shown in the drawing, in which it rests with the piston 8 on the inner surface of the end cover 5.
  • the drive unit 25 is held in the retracted position by the constantly acting restoring force F R.
  • the 3/2-way valve can be switched to the vent switch position, whereupon the extension force F A is omitted and the drive unit 25 is moved back into the retracted position by the restoring force F R which continues to act.
  • the switching which triggers the retraction movement of the drive unit 25 of the 3/2-way valve can by a sensor device are triggered when the extended Position of the drive unit 25 responds.
  • the Piston 8 for example, a permanent magnetic actuator 42 have contactless with one not closer shown sensor cooperates outside the receiving space 7.
  • the sensor can be a simple cylinder switch or Be reed switch.
  • the actuating element 42 is concerned for example a ring magnet.
  • the design of the piston rod 15 made of aluminum material with a tensile strength of at least 300 N / mm 2 also makes a not insignificant contribution. Compared to a conventional steel piston rod, this results in a not inconsiderable weight saving, which allows higher acceleration values of the drive unit 25 due to the associated reduction in the mass to be moved.
  • the high tensile strength guarantees high resilience, so that the possible uses are not restricted compared to conventional working cylinders.
  • the Piston rod 15 is hollow over at least part of its length is trained.
  • the corresponding cavity 36 extends expediently starting from the opposite of the piston 8 outer end of the piston rod 15 coaxially in the direction towards the piston 8. Its length is expediently more than half the piston rod length. For example, it can by drilling out those originally made in solid material Piston rod 15 are made.
  • the cavity 36 can be used for multiple functions if required connect. So the piston rod 15 in the range of Cavity 36 may be provided with an internal thread 37, the allows the attachment of another component, for example one is the attachment of an object to be moved enabling coupling part or the object to be moved itself. So that the screwing process can be carried out without any problems goes, the piston rod 15, in particular at the outer end region, on the circumference with the attachment of a holding tool enabling key surface 38 equipped his.
  • the piston rod 15 is in the area their outer circumference with a surface hardness, which is over 40 HRC (Rockwell hardness).
  • HRC Rockwell hardness
  • the material of the piston 8 is also expedient selected in terms of weight saving. He therefore suitably consists of aluminum material, wherein however the strength values of the piston rod were not reached Need to become. It can be a conventional aluminum alloy act as they are especially for Components of the cylinder housing 3 is used.
  • the multi-part piston structure realized in the exemplary embodiment with two axially stacked disc bodies is not mandatory, but facilitates the assembly of the annular actuator 42.
  • the invention enables Structure of the drive device also an operation with relatively low air consumption. Because the entry movement from which previously from the piston rod side cylinder chamber ejected actuating fluid is caused Air consumption for the entry movement is zero, which in Compared to conventional modes of operation a considerable one Energy saving entails.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP01118584A 2001-01-20 2001-08-02 Dispositif d'entrainement par vérin à pression fluidique Withdrawn EP1225343A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20101049U 2001-01-20
DE20101049U DE20101049U1 (de) 2001-01-20 2001-01-20 Antriebsvorrichtung

Publications (1)

Publication Number Publication Date
EP1225343A1 true EP1225343A1 (fr) 2002-07-24

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Family Applications (1)

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EP01118584A Withdrawn EP1225343A1 (fr) 2001-01-20 2001-08-02 Dispositif d'entrainement par vérin à pression fluidique

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EP (1) EP1225343A1 (fr)
DE (1) DE20101049U1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252003A (zh) * 2010-05-20 2011-11-23 罗伯特·博世有限公司 带多件式活塞杆的压力介质缸
DE102013008956A1 (de) * 2013-05-27 2014-11-27 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Stelleinrichtung für ein Kraftfahrzeuggetriebe oder eine Kraftfahrzeugkupplung
DE102013008955A1 (de) * 2013-05-27 2014-11-27 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Stelleinrichtung für bewegungsbetätigte Vorrichtungen in Kraftfahrzeugen mit nur einem einzigen Schaltventil
DE102014007439A1 (de) * 2014-05-21 2015-11-26 Festo Ag & Co. Kg Pneumatisches Antriebssystem und Verfahren zu seinem Betreiben

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20208568U1 (de) 2002-06-03 2002-08-29 Fte Automotive Gmbh Hydraulikzylinder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8323775U1 (de) * 1983-08-18 1988-02-11 Festo KG, 7300 Esslingen Einfachwirkender Arbeitszylinder
US4876945A (en) * 1987-10-13 1989-10-31 Festo Kg Piston and cylinder unit
WO1998038431A1 (fr) * 1997-02-26 1998-09-03 Festo Ag & Co. Tige de piston pour commande lineaire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8323775U1 (de) * 1983-08-18 1988-02-11 Festo KG, 7300 Esslingen Einfachwirkender Arbeitszylinder
US4876945A (en) * 1987-10-13 1989-10-31 Festo Kg Piston and cylinder unit
WO1998038431A1 (fr) * 1997-02-26 1998-09-03 Festo Ag & Co. Tige de piston pour commande lineaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BACKE W.: "GRUNDLAGEN DER ÖLHYDRAULIK", 1988, RWTH, AACHEN, XP002186973 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252003A (zh) * 2010-05-20 2011-11-23 罗伯特·博世有限公司 带多件式活塞杆的压力介质缸
DE102013008956A1 (de) * 2013-05-27 2014-11-27 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Stelleinrichtung für ein Kraftfahrzeuggetriebe oder eine Kraftfahrzeugkupplung
DE102013008955A1 (de) * 2013-05-27 2014-11-27 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Stelleinrichtung für bewegungsbetätigte Vorrichtungen in Kraftfahrzeugen mit nur einem einzigen Schaltventil
DE102014007439A1 (de) * 2014-05-21 2015-11-26 Festo Ag & Co. Kg Pneumatisches Antriebssystem und Verfahren zu seinem Betreiben
DE102014007439B4 (de) * 2014-05-21 2016-03-03 Festo Ag & Co. Kg Pneumatisches Antriebssystem und Verfahren zu seinem Betreiben

Also Published As

Publication number Publication date
DE20101049U1 (de) 2001-03-29

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