EP1866548A1 - Piston et dispositif de reglage commande par un fluide et equipe de ce piston - Google Patents

Piston et dispositif de reglage commande par un fluide et equipe de ce piston

Info

Publication number
EP1866548A1
EP1866548A1 EP06707196A EP06707196A EP1866548A1 EP 1866548 A1 EP1866548 A1 EP 1866548A1 EP 06707196 A EP06707196 A EP 06707196A EP 06707196 A EP06707196 A EP 06707196A EP 1866548 A1 EP1866548 A1 EP 1866548A1
Authority
EP
European Patent Office
Prior art keywords
piston
segments
permanent magnet
piston according
magnet
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
EP06707196A
Other languages
German (de)
English (en)
Other versions
EP1866548B1 (fr
Inventor
Michael Rau
Wolfgang Rammler
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 EP10006849A priority Critical patent/EP2228544B1/fr
Publication of EP1866548A1 publication Critical patent/EP1866548A1/fr
Application granted granted Critical
Publication of EP1866548B1 publication Critical patent/EP1866548B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

Definitions

  • the invention relates to a piston of a fluid operable adjusting device, in particular a linear drive or a shock absorber, with a supporting body which has a coaxial to the piston longitudinal axis annular recess in which at least one annular permanent magnet arrangement is arranged. Furthermore, the invention relates to a fluid-actuated actuating device equipped with such a permanent magnet arrangement.
  • DE 3404095 C2 It is a linear drive in the form of a fluid-actuated working cylinder with a transmission of the driving force serving, attached to a piston rod piston.
  • the piston For non-contact detection of the piston position, the piston carries a permanent magnet arrangement in the form of an annular permanent magnet which can cooperate with position detection means arranged on the outside of the housing.
  • the permanent magnet is seated in an annular recess, which is defined in the region of the joining surface of two axially interconnected piston parts.
  • the assembly of the piston takes place during assembly on the piston rod, whereby the annular permanent magnet between the two piston parts is inserted.
  • the problem with such a design is the complexity of the piston construction, which is primarily attributable to the necessary integration of the permanent magnet arrangement, and the associated installation effort.
  • From DE-PS 1 185 276 shows a special structure of a stator of an electric motor.
  • This stator includes a plurality of magnetic segments, which are partially elastic and which are inserted axially into a cylindrical iron jacket.
  • the permanent magnet arrangement is segmented in its circumferential direction and consists of at least two arcuate magnet segments, and that the annular recess is designed as an annular groove with a radially outwardly oriented tan opening into which the magnet segments are inserted radially from the outside to form an annular configuration.
  • a fluid-operated adjusting device which has a position detecting means. has permitted housing, which defines a receiving chamber in which a piston of the type defined above is arranged linearly displaceable, which is coupled for the force picking with an accessible outside of the housing Kraftab- grip part.
  • the piston assembly according to the invention enables the simple realization of a ring magnet construction without a mandatory requirement of a piston pitch in the region of the recess receiving the permanent magnet arrangement.
  • the annular permanent magnet arrangement is composed of a plurality of arcuate magnet segments, which can be inserted into the annular recess formed as an annular groove during manufacture of the piston from radially outside, in order then to define a segmented but nonetheless annular permanent magnet arrangement.
  • Such a piston can be relatively easily assembled independently of the mounting on a Kraftabgriffsteil, which reduces the storage costs and improves availability. It can also be used for special cost reduction to an even one-piece support body, because the assembly of the permanent magnet arrangement does not require a division of the support body.
  • the magnet segments are polarized with one another in the same orientation, in order to ensure, in spite of the segmentation, a magnetic field which is as uniform as possible along the entire circumference of the ring.
  • a magnetic field which is as uniform as possible along the entire circumference of the ring.
  • an axial polarization of the magnet segments has been found.
  • the number of magnet segments for forming the annularly configured permanent magnet arrangement is in principle arbitrary. It is advisable to use only magnetic
  • the permanent magnet arrangement is composed of exactly two magnet segments whose end sections are assigned to one another in pairs. Assembly within the framework of
  • the magnetic segments in such a way that the mutually facing end sections of the magnetic segments which are respectively adjacent in the circumferential direction are free from overlapping are opposite.
  • the magnet segments can butt against each other. Since, however, relatively high magnetic repulsion forces may act on the joints or transition regions, such a design should be combined with additional fastening measures in order to fix the individual magnet segments in place on the piston. For example, a latching attachment or fixing by an adhesive connection would be possible.
  • the self-sustaining effect can be realized in particular in conjunction with a shaping in which the preferably axially polarized magnet segments overlap at their mutually facing end sections in the circumferential direction of the permanent magnet arrangement.
  • a magnetic force compressing the magnet segments is produced between the overlapping sections.
  • the active surface of this magnetic holding force can be carried out relatively large simply by the fact that the magnet segments at the mutually facing end portions each have a nose projecting in a first radial plane in the circumferential direction of the permanent magnet arrangement with respect to a reference point and a parallel second radial plane spaced apart from the first radial plane opposite has recessed recess to the nose with respect to the reference point, so that in the assembled state overlapping end portions of the nose of one end portion in the recess of the other Endab-section dives and in the circumferential direction of the permanent magnet arrangement is a relatively large overlap length.
  • the permanent magnet arrangement can be exposed radially on the outside. Alternatively, however, it can also be covered by a piston component. If the piston is equipped with a guide ring which makes sliding contact with the piston running surface in the state installed in the housing of an adjusting device, the permanent magnet arrangement can be coaxially enclosed by this guide ring.
  • FIG. 1 shows a piston of a preferred construction according to the invention as a component of a fluid-actuated adjusting device, the further components of which are shown in dash-dot fashion only;
  • FIG. 2 is an axial view of the piston of FIG. 1 looking in the direction of arrow II;
  • FIG. 3 shows the piston according to FIGS. 1 and 2 in a perspective exploded view
  • FIGS. 1 to 3 shows an uncut side view of the piston according to FIGS. 1 to 3 without illustration of the guide ring and with enlarged representation of the transitional rich between two circumferentially successive magnetic segments and
  • FIG. 5 shows a radial section through the piston according to FIG. 4 along a sectional plane V-V which is radial with respect to the piston longitudinal axis.
  • FIG. 1 shows a total of a fluid-operated adjusting device 1 in one embodiment as a fluid-operated linear drive.
  • the adjusting device 1 comprises a housing 2, which defines a linearly extending and preferably a circular cross-section receiving chamber 3, in which a corresponding circular outer contour having piston 4 is arranged linearly displaceable back and forth.
  • the piston longitudinal axis 5 extends in the direction of movement of the piston 4 and coincides with the longitudinal axis of the receiving chamber 3.
  • the receiving chamber 3 is closed at the two end sides by a respective end wall 6a, 6b of the housing 2.
  • the peripheral boundary of the receiving chamber 3 assumes a between the two end walls 6a, 6b extending ein 0 or multi-part tubular body 7, the inner surface defines a cylindrical piston tread 8, on which the piston 4 slides in its linear movement.
  • the end walls 6a, 6b are expediently designed as a housing cover.
  • the receiving chamber 3 is divided axially into two s working chambers 12a, 12b, into each of which a fluid channel 13a, 13b opens, via which a controlled fluid loading is possible.
  • the piston 4 moves in one or the other direction or remains in place.
  • the fluid used for the operation is preferably compressed air. However, the use of another gaseous medium or a hydraulic medium is possible.
  • the linear movement of the piston 4 can be tapped outside of the housing 2 on a force-separating part 14 coupled in a motion-coupled manner to the piston 4.
  • the latter is in the embodiment of a piston rod, the at least one of the end walls 6a under seal and slidably guided passes through lo and is fixed with its lying within the receiving chamber 3 section on the piston 4.
  • the piston 4 expediently has a central, continuous attachment hole 15 with which it is plugged onto the piston rod 14 until it is stepped.
  • the axial fi xing is done by way of example by a screw 16, wherein a nut 17 is screwed onto a protruding from the mounting hole 15 threaded portion 18 of the piston rod 14.
  • the adjusting device 1 could in principle also be designed as a shock absorber or other passive device.
  • the piston 4 would be displaced by a non-fluidically introduced into it driving force, displacing the fluid contained in the receiving chamber 3.
  • the piston 4 has a preferably one-piece and 2s in particular made of metal circular disk-shaped support body 22 in which the mounting hole 15 is formed.
  • the support body 22 is provided with an annular recess designed as an annular groove 23, which is arranged coaxially with the longitudinal axis 5 of the piston and extends around the support body 22.
  • the correspondingly shaped circumferential contour of the piston 4 slot-shaped groove opening 24 is oriented with respect to the piston longitudinal axis 5 radially outward and the piston tread 8 faces.
  • Axial on both sides of the annular groove 23 is bounded by a respective groove flank 25a, 25b and radially inwardly by a preferably circular cylindrical groove base 26.
  • the cross section of the annular groove 23 is rectangular.
  • annular permanent magnet assembly 27 In the annular groove 23 is coaxially seated an annular permanent magnet assembly 27. It extends along the entire piston circumference and generates a continuous magnetic field, which passes through the tubular body 7.
  • the position detection means 28 respond to the magnetic field of the permanent magnet assembly 27, when the latter passes by appropriate movement of the piston 4 in a certain position, for example, the position detection means 28 ra dial in opposite. As a result, the position of the piston 4 can be detected.
  • the position detection means 28 contain, for example, at least one so-called reed switch or Hall sensor, but may also be designed as a displacement measuring system.
  • the permanent magnet arrangement 27 is covered in the region of its outer circumference by a component arranged on the piston 4.
  • a hollow-cylindrical guiding ring 32 consisting of plastic material acts as a cover and sits coaxially on the outer circumference of the supporting body 22 at the axial height of the annular groove 23.
  • it is interrupted at one point of its circumference (interruption 33). Due to its elasticity, it can therefore be temporarily expanded during assembly.
  • the piston 4 slides with its guide ring 32 on the piston tread 8 from.
  • Axial on both sides of the annular groove 23 is on the support body 22 each one to the piston longitudinal axis 5 coaxial annular piston seal 34a, 34b arranged. They are expediently formed by injection molding on the support body 22. Incidentally, the latter expediently consists of non-magnetizable material, such as aluminum or stainless steel, so as not to impair the propagation of the magnetic field generated by the permanent magnet arrangement 27.
  • the piston seals 34a, 34b may be an integral part of two elastomer components 35a, 35b, which are integrally formed on the support body 22 and in addition to the respective associated piston seal 34a, 34b, for example, to the End faces of the piston 4 arranged buffer structures 36 can form, which are able to reduce the impact in the end positions.
  • the permanent magnet arrangement 27 is segmented in its circumferential direction B. Said circumferential direction is illustrated in the drawing by a double arrow at 37 and extends along the circumference of the piston longitudinal axis fifth
  • the permanent magnet assembly 27 is composed of a plurality of arcuate magnet segments 38, 39 lo, which are preceded by their concavity through the slot opening 24 according to arrows 42 from radially outside into the annular groove 23 inserted so that they are consecutive in the circumferential direction 37 come to rest and form an annular configuration representing the permanent magnet arrangement i5 27.
  • the arc length of the individual magnet segments 38, 39 is expediently chosen such that the mutually facing end sections 38a, 39a, 38b, 39b of the magnetic segments 38, 39, which are each directly successively arranged in the circumferential direction 37, are immediately adjacent in a transition area 43 and expediently even touch.
  • the annular permanent magnet arrangement 27 consists of only two magnet segments 38, 39 with mutually equal arc length, which expediently corresponds in each case to at least 180 °.
  • the magnetic segments 38 are expediently also designed circular arc. Their inner radius corresponds at least substantially to the radius of the groove base 26.
  • the magnet segments 38, 39 are preferably axially, that is polarized in the direction of the piston longitudinal axis 5, with mutually identical orientation.
  • the north poles of all magnetic segments 38, 39 marked “N” in FIG. 4 lie on one side and the south poles of all magnet segments 38, 39 denoted "S” in FIG. 4 on the opposite other axial side of the permanent magnet arrangement 27. The latter corresponds Therefore, from the mode of action of a one-piece, axially polarized ring magnet.
  • the identical orientation has the advantage that a constant magnetic field is achieved along the entire circumference of the permanent magnet arrangement 27 and thus also in the transition region 43. As a result, an always reliable position query can be ensured even with non-rotating piston 4.
  • the carrier body 22 can be formed in the region defining the annular groove 23 and preferably integrally in one piece, without impairing the mountability of the permanent magnet arrangement 27.
  • the individual magnet segments 38, 39 are easily inserted over the groove opening 24 into the annular groove 23 during assembly. A subdivision of the support body 22 in the region of the annular groove 23 is thus not required.
  • the magnetic segments 38, 39 are formed so that they in the respective transition region 43 with their local end portions 38a, 39a; 38b, 39b overlap a piece in the circumferential direction 37.
  • the width of the magnet segments 38, 39 measured in the direction of the piston longitudinal axis 5 is locally reduced in a coordinated manner in the region of the mentioned end sections, so that a constant width of the permanent magnet arrangement 27 is also established overall over the respective transition region.
  • the overlapping portions of the magnet segments 38, 39 are in the axial direction of the permanent magnet assembly 27, ie in the direction of the piston longitudinal axis 5, advantageously side by side.
  • the strength of the attraction force can also be well influenced and executed so that the mutually facing end portion 38a, 39a; 38b, 39b are firmly held together by the magnetic forces prevailing in the transitional area by latching.
  • the ring configuration thus holds only by the see the individual magnetic segments 38, 39 together effective magnetic forces, so that unnecessary special fastening measures to fix the magnet segments 38, 39 in the annular groove 23. If necessary, however, 5 may be additionally provided such fastening measures.
  • the magnet segments 38, 39 are in the lo range of the overlapping end portions 38a, 39a; 38b, 39b each provided with a respect to a reference point 52 in the circumferential direction 37 projecting nose 53 and a recess 52 with respect to the reference point 52.
  • the recess 54 is designed to be complementary to the nose 53 i5. Nose 53 and recess 54 of a respective end portion 38a, 38b, 39a, 39b extend in two axially spaced-apart radial planes 55, 56, so that in the united state of the magnet segments 38, 39 at the individual transition regions 43, the nose 53 of each one Endab- Section immersed in the recess 54 of the respective other end portion in the circumferential direction 37.
  • the recess 54 on the adjacent nose 53 opposite axial side is suitably open. It also closes
  • the permanent magnet arrangement 27 is composed of mutually identical magnet segments 38, 39.
  • the lugs 53 are expediently at a radial distance "a" to the extended inner peripheral surface of the associated magnetic segment 38 and 39 arranged.
  • This radial distance "a” causes, with the use of only two magnet segments 38, 39, which each have to enclose a half of the piston circumference, that the width "W" between the two end sections 38a, 38b or 39a, 39b of a respective magnet segment 38, 39 defined mounting opening 63 is larger than the diameter of the annular groove 23 in the region of the groove base 26.
  • each magnet segment 38, 39 expediently has one in the circumferential direction 37. oriented end face 64 extending from the
  • Inner circumferential surface 62 extends to the root portion of the nose 53 to s radially outward.
  • Magnetic segments 38, 39 combined with one another by means of the assembly face each other with their support surfaces 64 in pairs and can also rest on one another.
  • the two reference locations 52 of a respective magnet segment 38, 39 are expediently located on a straight line 65 drawn in phantom in FIG. 5, which intersects the longitudinal axis 5 of the piston.
  • the magnet segments 38, 39 can also be designed so that they complement each other in the circumferential direction 37 without overlapping to an annular configuration.
  • the transition region between two adjacent end sections can then be designed, in particular, in the manner indicated by dash-dotted lines in FIG. 4 at 43 ', wherein the immediately 0 consecutive magnet segments lie opposite one another with end faces 67, 68 not lying in the same plane, ie not offset in the circumferential direction 37 ,
  • the assembled magnet segments 38, 39 should additionally be fixed. This is done expediently, as already mentioned above, by a mutual bonding of the magnet segments 38, 39 in the transition regions 43 'and / or fixed relative to the support body 22 fasteners that hold the Mag-0 netsegmente 38, 39 in the annular groove 23.
  • protruding projections 72 may be provided, which overlap the inserted magnetic segments 38, 39 on the outer circumference a piece and thereby hold form-fitting manner.
  • the projections 72 may in this case be designed as latching means, so that it is possible to use the magnetic segments 38, 39 by a latching operation in the annular groove 23 and to fix.
  • the magnetization of the magnet segments 38, 39 leading to the desired polarization can be carried out either before or even after insertion into the annular groove 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

L'invention concerne notamment un piston d'un dispositif de réglage commandé par un fluide. Le piston contient un corps support (22) présentant un évidement annulaire qui est coaxial à l'axe longitudinal du piston et dans lequel est placé au moins un aimant permanent (27) annulaire. L'aimant permanent (27) est segmenté dans sa direction circonférentielle (37) et est constitué d'au moins deux segments aimant (38, 39) en arc. L'évidement annulaire est réalisé comme une rainure annulaire (23) dotée d'un évidement (24) orienté radialement vers l'extérieur et dans lequel les segments aimant (38, 39) sont insérés radialement depuis l'extérieur en formant une configuration annulaire.
EP06707196A 2005-04-07 2006-02-23 Piston et dispositif de reglage commande par un fluide et equipe de ce piston Expired - Lifetime EP1866548B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10006849A EP2228544B1 (fr) 2005-04-07 2006-02-23 Piston et dispositif actionné par fluide equipé avec ledit piston

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200520005508 DE202005005508U1 (de) 2005-04-07 2005-04-07 Kolben und damit ausgestattete fluidbetätigte Stellvorrichtung
PCT/EP2006/001637 WO2006105828A1 (fr) 2005-04-07 2006-02-23 Piston et dispositif de reglage commande par un fluide et equipe de ce piston

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP10006849.3 Division-Into 2010-07-02

Publications (2)

Publication Number Publication Date
EP1866548A1 true EP1866548A1 (fr) 2007-12-19
EP1866548B1 EP1866548B1 (fr) 2011-01-12

Family

ID=34639185

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10006849A Expired - Lifetime EP2228544B1 (fr) 2005-04-07 2006-02-23 Piston et dispositif actionné par fluide equipé avec ledit piston
EP06707196A Expired - Lifetime EP1866548B1 (fr) 2005-04-07 2006-02-23 Piston et dispositif de reglage commande par un fluide et equipe de ce piston

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10006849A Expired - Lifetime EP2228544B1 (fr) 2005-04-07 2006-02-23 Piston et dispositif actionné par fluide equipé avec ledit piston

Country Status (5)

Country Link
US (1) US7650828B2 (fr)
EP (2) EP2228544B1 (fr)
CN (1) CN101151468B (fr)
DE (2) DE202005005508U1 (fr)
WO (1) WO2006105828A1 (fr)

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DE102006041601A1 (de) * 2006-09-05 2008-03-06 ITW Oberflächentechnik GmbH & Co. KG Steuereinrichtung eines Druckluftmotors, insbesondere in Kombination mit einer Pumpe und einer Sprühbeschichtungsanlage
WO2008074024A2 (fr) * 2006-12-13 2008-06-19 Stoneridge Control Devices, Inc. Capteur de position de cylindre et cylindre incorporant celui-ci
DE102008010247A1 (de) * 2008-01-16 2009-07-23 Stabilus Gmbh Kolben-Zylinderaggregat
DE102008014506A1 (de) 2008-03-15 2009-09-17 Wabco Gmbh Zylinder
CN102084445A (zh) * 2008-05-19 2011-06-01 石通瑞吉控制装置公司 汽缸位置传感器和包括所述传感器的汽缸
GB0812903D0 (en) * 2008-07-15 2008-08-20 Rota Eng Ltd Linear actuator and position sensing apparatus therefor
DE102009045603A1 (de) * 2009-10-13 2011-04-14 Robert Bosch Gmbh Handwerkzeug mit einem Luftfederschlagwerk
US9144929B2 (en) * 2012-08-06 2015-09-29 Synventive Molding Solutions, Inc. Apparatus and method for detecting a position of an actuator piston
US9341266B1 (en) 2012-08-28 2016-05-17 Texas Hydraulics, Inc. Position sensing hydraulic cylinder
PL2957872T3 (pl) 2014-06-18 2018-08-31 Caterpillar Global Mining Europe Gmbh Urządzenie wykrywające do cyfrowego czujnika położenia liniowego
KR101966074B1 (ko) 2014-10-02 2019-04-05 에스엠시 가부시키가이샤 유체압 실린더
WO2016074691A1 (fr) * 2014-11-12 2016-05-19 Festo Ag & Co. Kg Piston et dispositif de réglage équipé de ce dernier
CN106687696B (zh) * 2014-11-12 2019-02-05 费斯托股份有限两合公司 活塞和装备有该活塞的调节设备
EP3353426B1 (fr) * 2015-09-22 2021-05-19 Kongsberg Automotive As Cylindre à double action
JP6558583B2 (ja) 2016-08-10 2019-08-14 Smc株式会社 流体圧装置及びピストン組立体の製造方法
JP6598079B2 (ja) * 2016-12-06 2019-10-30 Ｓｍｃ株式会社 ロッド組立体及び流体圧装置
DE102017206297B4 (de) * 2017-04-12 2025-05-08 Festo Se & Co. Kg Fluidbetätigter Arbeitszylinder und diesbezügliches Herstellungsverfahren
DE102017206298B4 (de) * 2017-04-12 2025-03-27 Festo Se & Co. Kg Antriebseinheit, damit ausgestatteter fluidbetätigter Arbeitszylinder und diesbezügliches Herstellungsverfahren
ES2914979T3 (es) * 2019-12-19 2022-06-20 Contelec Ag Bomba de pistón axial
DE102021205951B4 (de) * 2021-06-11 2024-09-26 Festo Se & Co. Kg Kolben und damit ausgestatteter fluidbetätigter Arbeitszylinder
DE102022111233B4 (de) * 2022-05-05 2025-01-23 Svm Schultz Verwaltungs-Gmbh & Co. Kg Verriegelungseinheit

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Also Published As

Publication number Publication date
EP2228544A1 (fr) 2010-09-15
EP2228544B1 (fr) 2011-06-08
EP1866548B1 (fr) 2011-01-12
CN101151468A (zh) 2008-03-26
US20070279045A1 (en) 2007-12-06
CN101151468B (zh) 2012-06-20
DE202005005508U1 (de) 2005-06-02
WO2006105828A1 (fr) 2006-10-12
DE502006008708D1 (de) 2011-02-24
US7650828B2 (en) 2010-01-26

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