EP0631057B2 - Piston avec joint d'étanchéité - Google Patents

Piston avec joint d'étanchéité Download PDF

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Publication number
EP0631057B2
EP0631057B2 EP94103900A EP94103900A EP0631057B2 EP 0631057 B2 EP0631057 B2 EP 0631057B2 EP 94103900 A EP94103900 A EP 94103900A EP 94103900 A EP94103900 A EP 94103900A EP 0631057 B2 EP0631057 B2 EP 0631057B2
Authority
EP
European Patent Office
Prior art keywords
piston
supporting body
housing
sealing
permanent 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.)
Expired - Lifetime
Application number
EP94103900A
Other languages
German (de)
English (en)
Other versions
EP0631057B1 (fr
EP0631057A1 (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(B2) "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
Application granted granted Critical
Publication of EP0631057B1 publication Critical patent/EP0631057B1/fr
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 piston with seal. According to the preamble of Claim 1.
  • Such a piston is from the Italian utility model 53974-B / 86 known.
  • the piston which is connected to a piston rod and im cylindrical housing is axially movable, is for sealing the in Axial direction adjacent sub-spaces, the housing with a Seal.
  • the seal is designed as a complete piston, whereby this consists of three components.
  • the two piston halves made up of one non-magnetic carrier material and an elastomeric sealing material exist, enclose a permanent magnet, which is used to query the position of the Piston is needed.
  • the housing is on its outer circumference Provide magnetic field sensors that conduct signals with a display device are connected. Furthermore, the housing is in the axial direction on both sides of the Provide the piston with a compressed air connection.
  • the seal should be noted that it consists of several individual parts exists, which is both in manufacturing technology and in economic Is not very satisfactory.
  • From DE-7 635 587 is a pneumatic or hydraulic piston-cylinder unit known, the at least one arranged on the cylinder Magnetic switch and a piston having at least one in a groove arranged magnetic element is provided.
  • the magnetic element is a flexible, slotted magnetic tape that fits into a groove of the one-piece piston is inserted, one around the magnetic tape Sliding guide band is arranged inside the cylinder.
  • the Guide belt is made of a slidable plastic and slides during of operation along the inner wall of the cylinder. Both that Magnetic element as well as the guide band can be due to the slot bent and with its cut edges on the circumference over the piston pushed and inserted into the groove.
  • the pistons are in radial Provided circumferential grooves sealing elements, the sealing lip protrudes outside the piston in the radial direction and with the inner wall of the cylinder can be sealingly engaged.
  • the magnetic element and that Piston receiving guide element is itself formed in one piece.
  • the invention has for its object a piston of the known type to develop in such a way that it consists of fewer individual parts as well is easier and cheaper to manufacture.
  • the support body is formed in one piece and is connected to the permanent magnet.
  • the entire seal, which is designed as a complete piston can consist of only one component.
  • the permanent magnet is for example encapsulated by the polymeric material of the support body, the support body also being molded is in turn encapsulated with the elastomeric material of the sealing lip.
  • the support body completely surrounds the permanent magnet, the Permanent magnet on the side of the support body facing the housing is arranged.
  • the permanent magnet is as good as possible To arrange signal transmission in the area of the outer circumference of the support body. Due to the complete sheathing, the permanent magnet is in front of the outside Influences, such as impact loads that impair functionality protected and is always in a defined position in the piston.
  • a guide ring is arranged between the axially adjacent sealing lips, which is formed in one piece with the support body, the guide ring is slidably engageable with the housing.
  • the seal is advantageous in that tilting movements and Tilting related to the housing can be avoided.
  • the elastomer The material of the two sealing lips can be in the area of Outer peripheral boundary of the support body, where the material of the two sealing lips past the inner circumference of the support body is integrally formed into one another. This is a seal of the piston on the piston rod.
  • the supporting body, which also Guide ring includes, can consist of a suitable material or on the side facing the housing with a friction-reducing Be surface coating
  • the support body can have an axial spacing from one another Be sealing lips connected, the sealing lips in one piece transiently formed and in each case in the area of a boundary on the strin side of the support body are arranged.
  • the guide ring can be made of PTFE. Different polymers Materials that also have a low coefficient of friction and a good one Can also be resistant to abrasive wear apply.
  • Fig. 1 the piston according to the invention with a seal as a complete piston shown, which is arranged within a housing 6.
  • the housing 6 is in Area of its limits on the strins side, each with a compressed air connection 9, 10 provided to alternately pressurize the piston 5 and move back and forth in the axial direction.
  • To query the position of the piston 5 In the housing 6 there are 6 magnetic field sensors 11, 11 on the housing arranged, which are connected in a signal-conducting manner to a display device 12.
  • the piston 5 moves under one of the magnetic field sensors 11, 11 through, there is a corresponding signal on the display device 12.
  • Der Piston is stepped on a diameter Piston rod 13 mounted in the axial direction on the one hand through the housing 6 is passed.
  • the piston 5 from FIG. 1 is shown as an individual part.
  • the piston 5 comprises a support body 1, which consists of PTFE in this embodiment.
  • the Support body 1 completely surrounds the permanent magnet 2 and is in the area formed on its outer circumference as a guide ring 7.
  • the Outside 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 manufacturing-related condition, so that this in the installed state with a radial prestress touch the inner wall of the housing 6 sealingly.
  • the sealing lips 3.1, 3.2 are on both sides of the support body 1 in the axial direction assigned adjacent and integrally formed into one another.
  • Sealing lips 3.1, 3.2 also guided past the inner circumference of the supporting body 1, in the area in which it is supported on a piston rod 13.
  • the entire piston is made in one piece.
  • the support body 1 and the Permanent magnet 2 are connected to each other, the permanent magnet 2 is completely surrounded by the supporting body 1 on the circumference.
  • the supporting body 1 is in turn adhesively connected to the sealing lip 3.

Landscapes

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

Claims (3)

  1. Piston (5) pourvu d'un joint d'étanchéité, entraíné 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 situé sur le côté du corps de support (1) orienté vers le logement (6) 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, le corps de support (1) étant exécuté en une seule pièce et étant relié à l'aimant permanent (2), et une bague de guidage (7) qui peut être mise en contact glissant avec le logement (6) étant située entre les lèvres d'étanchéité (3.1, 3.2) contiguës axialement, caractérisé en ce que le corps de support (1) entoure complètement l'aimant permanent (2) et en ce que la bague de guidage (7) et le corps de support (1) sont formés en une pièce.
  2. Piston selon la revendication 1, 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).
  3. Piston selon l'une des revendications 1 ou 2, caractérisé en ce que le corps de support (1) et la bague de guidage (7) sont 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 EP0631057B1 (fr) 1997-08-20
EP0631057B2 true 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
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
JP3468454B2 (ja) * 1999-07-12 2003-11-17 Ｓｍｃ株式会社 位置検出機能付き切換弁
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7635587U1 (de) † 1976-11-11 1977-03-10 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Pneumatische oder hydraulische Kolbenzylinder-Einheit
DE2730112C2 (de) † 1977-07-04 1982-04-15 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Kolbenanordnung, insbesondere für Trockenlaufkompressoren
DE3015258C2 (de) † 1980-04-21 1987-05-07 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Induktiver Kolbenstellungsgeber
EP0351317A1 (fr) † 1988-07-13 1990-01-17 Automax Vérin perfectionné

Family Cites Families (10)

* 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
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
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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7635587U1 (de) † 1976-11-11 1977-03-10 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Pneumatische oder hydraulische Kolbenzylinder-Einheit
DE2730112C2 (de) † 1977-07-04 1982-04-15 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Kolbenanordnung, insbesondere für Trockenlaufkompressoren
DE3015258C2 (de) † 1980-04-21 1987-05-07 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Induktiver Kolbenstellungsgeber
EP0351317A1 (fr) † 1988-07-13 1990-01-17 Automax Vérin perfectionné

Also Published As

Publication number Publication date
ATE157144T1 (de) 1997-09-15
ES2107069T5 (es) 2001-02-16
EP0631057B1 (fr) 1997-08-20
EP0631057A1 (fr) 1994-12-28
ES2107069T3 (es) 1997-11-16
DE4320840C1 (de) 1994-12-15
DE59403770D1 (de) 1997-09-25

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