EP0631057B1 - Joint d'étanchéité pour piston entrainé pneumatiquement - Google Patents

Joint d'étanchéité pour piston entrainé pneumatiquement Download PDF

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Publication number
EP0631057B1
EP0631057B1 EP94103900A EP94103900A EP0631057B1 EP 0631057 B1 EP0631057 B1 EP 0631057B1 EP 94103900 A EP94103900 A EP 94103900A EP 94103900 A EP94103900 A EP 94103900A EP 0631057 B1 EP0631057 B1 EP 0631057B1
Authority
EP
European Patent Office
Prior art keywords
supporting body
housing
sealing
permanent magnet
piston
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
EP94103900A
Other languages
German (de)
English (en)
Other versions
EP0631057A1 (fr
EP0631057B2 (fr
Inventor
Gonzalo Barillas
Guido Destefanis
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.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6491014&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0631057(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0631057A1 publication Critical patent/EP0631057A1/fr
Publication of EP0631057B1 publication Critical patent/EP0631057B1/fr
Application granted granted Critical
Publication of EP0631057B2 publication Critical patent/EP0631057B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—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 seal for a piston driven by a fluid medium, comprising a support body made of non-magnetizable material, which at least partially encompasses an annular permanent magnet and is connected to at least one sealing lip made of elastomeric material, the sealing lip projecting beyond the support body in the radial direction on the outside and can be sealingly engaged with the inner wall of a housing surrounding the piston.
  • Such a seal is known from Italian utility model 53974-B / 86.
  • the piston which is connected to a piston rod and is arranged so as to be axially movable in the cylindrical housing, is provided with a seal to seal the subspaces of the housing which are adjacent to one another in the axial direction.
  • the seal is designed as a complete piston, which consists of three components.
  • the two piston halves which consist of a non-magnetic carrier material and an elastomeric sealing material, enclose a permanent magnet that is required to query the position of the piston.
  • the housing is provided on its outer circumferential side with magnetic field sensors, which are connected in a signal-conducting manner to a display device. Furthermore, the housing is provided with a compressed air connection on both sides of the piston in the axial direction.
  • the invention has for its object to develop a seal of the known type such that it consists of fewer parts and is easier and cheaper to manufacture.
  • the support body is formed in one piece and is connected to the permanent magnet.
  • the advantage here is that the entire seal, which can be designed as a complete piston, consists of only one component.
  • the permanent magnet is, for example, overmoulded by the polymeric material of the support body, the support body itself being overmolded with the elastomeric material of the sealing lip. The manufacture of such a component can be carried out in one work step, which is favorable in terms of production technology and is of importance in economic terms.
  • the support body can completely enclose the permanent magnet, the permanent magnet being arranged on the side of the support body facing the housing.
  • the permanent magnet is to be arranged in the area of the outer circumference of the support body with a view to the best possible signal transmission. Due to the complete sheathing, the permanent magnet is protected from external influences, such as impact loads that impair functionality, and is always in a defined position in the piston.
  • the supporting body can be connected to two sealing lips which are axially spaced apart, the sealing lips being integrally merging into one another and each being arranged in the region of a boundary of the supporting body on the strin side.
  • the arrangement of the two sealing lips to the two pressure chambers results in a good sealing result of the partial spaces to be sealed against one another, since the partial space with a relatively higher pressure is assigned a sealing lip which is increasingly pressed against the sealing surface of the housing which adjoins in the radial direction with increasing excess pressure.
  • a guide ring can be arranged between the axially adjacent sealing lips, which is formed in one piece with the supporting body, the guide ring being slidably engageable with the housing.
  • the seal it is advantageous here that tilting movements and tilting in relation to the housing are avoided.
  • the elastomeric material of the two sealing lips can be left free in the area of the outer circumference of the support body, the material of the two sealing lips being integrally formed past one another past the inner circumference of the support body. This results in a sealing of the piston on the piston rod.
  • the support body which also includes the guide ring, can consist of a suitable material or can be provided with a friction-reducing surface coating on the side facing the housing.
  • the support body can be completely enclosed by the elastomeric material of the sealing lips, the elastomeric material having a circumferentially circumferential groove that is open to the outside in the radial direction between the sealing lips adjacent to one another with axial spacing, and one that slidably engages with the housing bringable guide ring is snapped into the groove.
  • the seal can alternatively be used with and without a guide ring.
  • the manufacture of a seal designed in this way is particularly simple because the support body, which surrounds the permanent magnet, is completely enclosed by the elastomeric material of the sealing lips. If such a seal is to be used, for example, as a complete piston, there is the option of snapping a guide ring into the groove in order to avoid tilting during axial movements in the housing.
  • the guide ring can be made of PTFE. Different polymer materials, which also have a low coefficient of friction and good resistance to abrasive wear, can also be used.
  • Fig. 1 the seal according to the invention is shown in a housing and can be acted upon with compressed air.
  • Fig. 2 the seal from Fig. 1 is shown as a single part.
  • Fig. 3 a second embodiment of the seal is shown, in which the guide ring is snapped into a groove between the sealing lips.
  • the seal according to the invention is shown as a complete piston which is arranged within a housing 6.
  • the housing 6 is provided in the area of its limits on the strins side with a compressed air connection 9, 10 in order to alternately pressurize the piston 5 and to move it back and forth in the axial direction.
  • magnetic field sensors 11, 11 are arranged on the housing and are connected in a signal-conducting manner to a display device 12. If the piston 5 moves under one of the magnetic field transducers 11, 11, a corresponding signal is output on the display device 12.
  • the piston is mounted on a piston rod 13 with a stepped diameter, which is passed through the housing 6 on the one hand in the axial direction.
  • the piston 5 from FIG. 1 is shown as an individual part.
  • the piston 5 comprises a support body 1, which in this embodiment consists of PTFE.
  • the support body 1 completely surrounds the permanent magnet 2 and is designed as a guide ring 7 in the region of its outer circumference.
  • the outer diameter of the guide ring 7 is smaller in the unassembled state than the outer diameter of the two sealing lips 3.1, 3.2 in the production-related state, so that they touch the inner wall of the housing 6 in the installed state with a radial preload.
  • the sealing lips 3.1, 3.2 are adjacent to the supporting body 1 on both sides in the axial direction and are integrally formed and merge.
  • the elastomeric material of the sealing lips 3.1, 3.2 is also guided past the inner circumference of the support body 1, in the area in which it is supported on a piston rod 13.
  • the entire complete piston is made in one piece.
  • the support body 1 and the permanent magnet 2 are connected to one another, the permanent magnet 2 being completely enclosed on the circumference by the support body 1.
  • the carrier body 1 is in turn adhesively connected to the sealing lip 3.
  • FIG. 3 shows a second exemplary embodiment of a complete piston, the elastomeric material of the sealing lips 3.1, 3.2 surrounding the support body 1, which completely surrounds the permanent magnet 2, from the sealing material along its entire outer circumference.
  • an outwardly open groove 8 is provided within the elastomeric material, into which a guide ring 7 can be snapped if necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Gasket Seals (AREA)
  • Actuator (AREA)

Claims (6)

  1. Joint d'étanchéité pour piston (5) entraîné par un milieu pouvant s'écouler, comprenant un corps de support (1) fait d'un matériau non magnétisable, qui entoure, au moins partiellement, un aimant permanent (2) de forme annulaire et est relié à au moins une lèvre d'étanchéité (3) en matière élastomère, la lèvre d'étanchéité (3) dépassant le corps de support (1) en direction radiale sur le côté extérieur et pouvant être mise en contact étanche avec la paroi intérieure (4) d'un logement entourant le piston, caractérisé en ce que le corps de support (1) est exécuté en une seule pièce et est relié à l'aimant permanent (2).
  2. Joint d'étanchéité selon la revendication 1, caractérisé en ce que le corps de support (1) entoure complètement l'aimant permanent (2) et en ce que l'aimant permanent (2) est situé sur le côté du corps de support (1) orienté vers le logement (6).
  3. Joint d'étanchéité selon la revendication 1 à 2, caractérisé en ce que le corps de support (1) est relié à deux lèvres d'étanchéité (3.1, 3.2) présentant une distance axiale l'une par rapport à l'autre et en ce que les lèvres d'étanchéité (3.1, 3.2) sont exécutées de manière à se fondre l'une dans l'autre et sont situées, respectivement, dans la zone d'une limite du côté frontal du corps de support (1).
  4. Joint d'étanchéité selon les revendications 1 à 3, caractérisé en ce qu'une bague de guidage (7) est située entre les lèvres d'étanchéité (3.1, 3.2) contiguës axialement, en ce que la bague de guidage (7) et le corps de support (1) sont solidaires et en ce que la bague de guidage (7) peut être mise en contact glissant avec le logement (6).
  5. Joint d'étanchéité selon les revendications 1 à 3, caractérisé en ce que le corps de support (1) est complètement entouré par la matière élastomère des lèvres d'étanchéité (3.1, 3.2), en ce que la matière élastomère est pourvue, entre les lèvres d'étanchéité (3.1, 3.2) contiguës présentant une distance axiale entre elles, d'une gorge (8) ouverte vers l'extérieur en direction radiale et faisant le tour de la circonférence, et en ce qu'une bague de guidage (7) pouvant être mise en contact glissant avec le logement (6) est emboîtée dans la gorge (8).
  6. Joint d'étanchéité selon les revendications 1 à 5, caractérisé en ce que la bague de guidage (7) est en PTFE.
EP94103900A 1993-06-23 1994-03-14 Piston avec joint d'étanchéité Expired - Lifetime EP0631057B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4320840A DE4320840C1 (de) 1993-06-23 1993-06-23 Dichtung für einen pneumatisch angetriebenen Kolben
DE4320840 1993-06-23

Publications (3)

Publication Number Publication Date
EP0631057A1 EP0631057A1 (fr) 1994-12-28
EP0631057B1 true EP0631057B1 (fr) 1997-08-20
EP0631057B2 EP0631057B2 (fr) 2000-11-29

Family

ID=6491014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94103900A Expired - Lifetime EP0631057B2 (fr) 1993-06-23 1994-03-14 Piston avec joint d'étanchéité

Country Status (4)

Country Link
EP (1) EP0631057B2 (fr)
AT (1) ATE157144T1 (fr)
DE (2) DE4320840C1 (fr)
ES (1) ES2107069T5 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9708815D0 (en) 1997-05-01 1997-06-25 Zeneca Ltd Process for making particulate compositions
DE19925083A1 (de) * 1999-06-01 2000-12-14 Festo Ag & Co Kolben für einen Arbeitszylinder und Verfahren zu seiner Herstellung
JP3468454B2 (ja) * 1999-07-12 2003-11-17 Ｓｍｃ株式会社 位置検出機能付き切換弁
JP3467213B2 (ja) * 1999-07-12 2003-11-17 Ｓｍｃ株式会社 位置検出機能付きパイロット式切換弁
DE19959664A1 (de) * 1999-12-10 2001-06-13 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zur Bestimmung der relativen Lage zweier Fahrzeugteile
DE10238402A1 (de) * 2002-08-22 2004-03-04 Zf Sachs Ag Kolben-Zylindereinheit
DE102006006677A1 (de) * 2006-02-14 2007-08-23 Parker Hannifin Gmbh & Co. Kg Magnetkolben für Pneumatikzylinder
EP2107256A1 (fr) 2008-03-31 2009-10-07 Carl Freudenberg KG Vérin pneumatique à fin de course amortie
EP2256381A1 (fr) 2009-05-27 2010-12-01 Carl Freudenberg KG Piston et son utilisation
WO2012052485A1 (fr) 2010-10-22 2012-04-26 Seal-Mart Engineered Plastics Kg Piston pour système pneumatique

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7836994U1 (de) * 1979-03-22 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Kolben für insbesondere mit Druckluft betriebene Arbeitszylinder
US3388915A (en) * 1965-07-19 1968-06-18 Gen Motors Corp Sealing means
DE7635587U1 (de) † 1976-11-11 1977-03-10 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Pneumatische oder hydraulische Kolbenzylinder-Einheit
NL182098C (nl) * 1977-02-05 1988-01-04 Freudenberg Carl Zuiger, in het bijzonder voor gebruik in een pneumatische cilinder.
US4171818A (en) * 1977-04-04 1979-10-23 Ferrofluidics Corporation Dynamic lip seal using ferrofluids as sealant/lubricant
DE2730112C2 (de) † 1977-07-04 1982-04-15 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Kolbenanordnung, insbesondere für Trockenlaufkompressoren
NL7908203A (nl) * 1978-12-14 1980-06-17 Festo Maschf Stoll G Zuiger, in het bijzonder voor een persluchtcilinder.
DE2947516C2 (de) * 1979-11-24 1981-09-03 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Kolben für berührungslose Abtastung der Kolbenstellung
DE3015258C2 (de) † 1980-04-21 1987-05-07 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Induktiver Kolbenstellungsgeber
DE8209420U1 (de) * 1982-04-02 1983-09-15 Robert Bosch Gmbh, 7000 Stuttgart Kolben fuer beruehrungslose abtastung der kolbenstellung
DE3442463A1 (de) * 1984-11-22 1986-05-28 Kaco Gmbh + Co, 7100 Heilbronn Dichtungsring
JPS63122902A (ja) * 1986-11-13 1988-05-26 Ckd Controls Ltd 移動体の位置確認装置
DE3644697C1 (de) * 1986-12-30 1988-02-11 Manfred Dipl-Ing Diesing Dichtungsvorrichtung mit Ferrofluid
FR2634256B1 (fr) † 1988-07-13 1992-12-31 Automax Verin perfectionne

Also Published As

Publication number Publication date
ATE157144T1 (de) 1997-09-15
EP0631057A1 (fr) 1994-12-28
ES2107069T3 (es) 1997-11-16
DE59403770D1 (de) 1997-09-25
DE4320840C1 (de) 1994-12-15
ES2107069T5 (es) 2001-02-16
EP0631057B2 (fr) 2000-11-29

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