EP0093859A2 - Piston for the contactless sensing of the piston position - Google Patents

Piston for the contactless sensing of the piston position Download PDF

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Publication number
EP0093859A2
EP0093859A2 EP83102578A EP83102578A EP0093859A2 EP 0093859 A2 EP0093859 A2 EP 0093859A2 EP 83102578 A EP83102578 A EP 83102578A EP 83102578 A EP83102578 A EP 83102578A EP 0093859 A2 EP0093859 A2 EP 0093859A2
Authority
EP
European Patent Office
Prior art keywords
piston
permanent magnet
sleeve
disks
sealing material
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
EP83102578A
Other languages
German (de)
French (fr)
Other versions
EP0093859A3 (en
EP0093859B1 (en
Inventor
Josef Steiner
Walter Tröster
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0093859A2 publication Critical patent/EP0093859A2/en
Publication of EP0093859A3 publication Critical patent/EP0093859A3/en
Application granted granted Critical
Publication of EP0093859B1 publication Critical patent/EP0093859B1/en
Expired 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
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the invention relates to a piston according to the preamble of the main claim.
  • a piston is relatively complicated in its construction, so that it becomes expensive and also requires very high assembly costs in series production.
  • the piston according to the invention with the characterizing features of the main claim has the advantage over the fact that it is very simple and therefore requires little assembly effort.
  • a profile disk 12 or 13 the inside diameter of which corresponds to that of the sleeve 10 and the rest on the end faces of the sleeves.
  • the profile disks are designed so that an axial gap remains between them and the magnet 11. Their outer diameter corresponds approximately to that of the magnet 11, but can also be smaller.
  • the profiled disks 12, 13 On their sides facing away from the magnet 11, have flat annular grooves 14 and 15, respectively, in relation to elevations 16, 17.
  • the four parts described - after they have been brought into the correct position - are completely encapsulated or sealed with a sealing material 18 umpreßt, and that the inside of the sleeve 10 and washers 12, 13, so like their end faces 12 ', 13'.
  • sealing lips 20, 21 are formed by the sealing material, which protrude somewhat radially outwards. The piston thus forms a compact structure.
  • the profile disks 12, 13 can consist of magnetically conductive or of magnetically non-conductive material. Depending on the selection, the size of the magnetic field of the permanent magnet 11 can be influenced, which depends on the particular task. In this way, the position of the piston can always be precisely located by a sensor outside the cylinder receiving it.
  • the piston is pushed onto a piston rod 22 and screwed down, for example with the aid of nuts 23, 24.
  • the sealing material applied to the end faces 12 ', 13' of the profiled disks 12, 13 and that on the inside of the sleeve takes over the sealing against the piston rod or the two piston sides.
  • the sleeve 10 ensures that no axial forces act on the permanent magnet 11.

Abstract

1. Piston whose position is to be sensed in a contactless manner, comprising an annular permanent magnet (11) which is arranged on both sides between discs (12, 13) which, together with the permanent magnet (11), are encased by sealing material (18) which also forms at least one sealing lip (20, 21) opposite the cylinder wall, characterized in that the permanent magnet (11) sits on a sleeve (10) which has a greater axial extent than the former, that there are intermediate spaces between the permanent magnet (11) and the discs (12, 13), designed as profile discs, with the exception of an area at the sleeve (10), that these intermediate spaces are filled by the sealing material (18) and that the inner side of the sleeve and also the discs, on all their outer sides, are encased by the sealing material (18).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Kolben nach der Gattung des Hauptanspruchs. Ein derartiger bekannter Kolben ist in seinem Aufbau relativ kompliziert, so daß er teuer wird und in Serienfertigung auch einen sehr hohen Montageaufwand erfordert.The invention relates to a piston according to the preamble of the main claim. Such a known piston is relatively complicated in its construction, so that it becomes expensive and also requires very high assembly costs in series production.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Kolben mit den kennzeichnenden Merkmalen des Hauptanspruchs hat dem gegenüber den Vorteil, daß er sehr einfach gestaltet ist und dadurch wenig Montageaufwand erfordert.The piston according to the invention with the characterizing features of the main claim has the advantage over the fact that it is very simple and therefore requires little assembly effort.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale möglich. Besonders vorteilhaft ist es, die Scheiben aus magnetisch leitendem oder nicht leitendem Werkstoff herzustellen, wodurch das Magnetfeld des Permanentmagneten so festgelegt werden kann, daß es für die jeweilige Aufgabe die gewünschte Größe hat.Advantageous further developments and improvements of the features specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous to manufacture the disks from magnetically conductive or non-conductive material, as a result of which the magnetic field of the permanent magnet can be determined in such a way that it has the desired size for the respective task.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Sie zeigt einen Längsschnitt durch einen Kolben.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. It shows a longitudinal section through a piston.

Beschreibung des ErfindungsbeispielsDescription of the invention example

Auf einer Hülse 10 sitzt passend ein ringförmiger Permanentmagnet 11, dessen Breite geringer ist als die Länge der Hülse 10. Zu beiden Seite von Hülse 10 und Magnet 11 befindet sich je eine Profilscheibe 12 bzw. 13, deren Innendurchmesser dem der Hülse 10 entsprechen und die an den Stirnseiten der Hülsen anliegen. Die Profilscheiben sind so gestaltet, daß zwischen ihnen und dem Magnet 11 ein axialer Zwischenraum verbleibt. Ihr Außendurchmesser entspricht etwa dem des Magneten 11, kann aber auch kleiner sein. An ihren dem Magneten 11 abgewandten Seiten weisen die Profilscheiben 12, 13 flache Ringnuten 14 bzw. 15 auf, diesen gegenüber Erhebungen 16, 17. Die beschriebenen vier Teile werden - nachdem sie in die richtige Position gebracht sind - mit einem Dichtungswerkstoff 18 vollständig umspritzt oder umpreßt, und zwar auch die Innenseiten von Hülse 10 und Profilscheiben 12, 13, sowie deren Stirnseiten 12', 13'. An den Außen- und Stirnseiten sind durch den Dichtungswerkstoff Dichtlippen 20, 21 gebildet, die radial etwas nach außen vorstehen. Damit bildet der Kolben ein kompaktes Gebilde.A ring-shaped permanent magnet 11, the width of which is smaller than the length of the sleeve 10, fits on a sleeve 10. On each side of the sleeve 10 and the magnet 11 there is a profile disk 12 or 13, the inside diameter of which corresponds to that of the sleeve 10 and the rest on the end faces of the sleeves. The profile disks are designed so that an axial gap remains between them and the magnet 11. Their outer diameter corresponds approximately to that of the magnet 11, but can also be smaller. On their sides facing away from the magnet 11, the profiled disks 12, 13 have flat annular grooves 14 and 15, respectively, in relation to elevations 16, 17. The four parts described - after they have been brought into the correct position - are completely encapsulated or sealed with a sealing material 18 umpreßt, and that the inside of the sleeve 10 and washers 12, 13, so like their end faces 12 ', 13'. On the outer and front sides, sealing lips 20, 21 are formed by the sealing material, which protrude somewhat radially outwards. The piston thus forms a compact structure.

Die Profilscheiben 12, 13 können aus magnetisch leitendem oder aber aus magnetisch nicht leitendem Werkstoff bestehen. Je nach Auswahl kann damit die Größe des Magnetfelds des Permanentmagneten 11 beeinflußt werden, was sich nach der jeweiligen Aufgabe richtet. Auf diese Weise kann die Lage des Kolbens durch einen Sensor außerhalb des ihn aufnehmenden Zylinders stets genau geortet werden.The profile disks 12, 13 can consist of magnetically conductive or of magnetically non-conductive material. Depending on the selection, the size of the magnetic field of the permanent magnet 11 can be influenced, which depends on the particular task. In this way, the position of the piston can always be precisely located by a sensor outside the cylinder receiving it.

Der Kolben wird auf eine Kolbenstange 22 aufgeschoben und beispielsweise mit Hilfe von Muttern 23, 24 festgeschraubt. Der auf die Stirnseiten 12', 13' der Profilscheiben 12, 13 aufgebrachte Dichtungswerkstoff sowie derjenige an der Innenseite von Hülse übernimmt die Abdichtung gegenüber der Kolbenstange bzw. den beiden Kolbenseiten. Die Hülse 10 sorgt dafür, daß keine axialen Kräfte auf den Permanentmagneten 11 einwirken.The piston is pushed onto a piston rod 22 and screwed down, for example with the aid of nuts 23, 24. The sealing material applied to the end faces 12 ', 13' of the profiled disks 12, 13 and that on the inside of the sleeve takes over the sealing against the piston rod or the two piston sides. The sleeve 10 ensures that no axial forces act on the permanent magnet 11.

Claims (3)

1. Kolben für berührungslose Abtastung der Kolbenstellung mit einem ringförmigen Permanentmagneten, der beidseitig zwischen Scheiben angeordnet ist, die zusammen mit dem Permanentmagneten durch Dichtungsmaterial umhüllt sind, durch das auch mindestens eine Dichtlippe gegenüber der Zylinderwand gebildet ist, dadurch gekennzeichnet, daß der Permanentmagnet (11) auf einer Hülse (10) sitzt, die eine größere axiale Erstreckung als jener aufweist, daß zwischen dem Permanentmagneten und den als Profilscheiben ausgebildeten Scheiben (12, 13) mit Ausnahme eines Bereichs an der Hülse (10) Zwischenräume bestehen, und daß diese wie auch die Innenseite der Hülse sowie die Scheiben an ihren gesamten Außenseiten vom Dichtungsmaterial umhüllt sind.1. Piston for contactless scanning of the piston position with an annular permanent magnet, which is arranged on both sides between disks, which are encased together with the permanent magnet by sealing material, through which at least one sealing lip is formed relative to the cylinder wall, characterized in that the permanent magnet (11 ) sits on a sleeve (10) which has a greater axial extent than that that between the permanent magnet and the disks designed as profile disks (12, 13) with the exception of a region on the sleeve (10) there are gaps, and that these like also the inside of the sleeve and the washers on their entire outer sides are encased by the sealing material. 2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß die Scheiben aus magnetisch leitendem Werkstoff bestehen.2. Piston according to claim 1, characterized in that the disks consist of magnetically conductive material. 3. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß die Scheiben aus magnetisch nicht leitendem Werkstoff bestehen.3. Piston according to claim 1, characterized in that the disks consist of magnetically non-conductive material.
EP83102578A 1982-04-02 1983-03-16 Piston for the contactless sensing of the piston position Expired EP0093859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828209420U DE8209420U1 (en) 1982-04-02 1982-04-02 PISTON FOR CONTACTLESS PISTON POSITION SENSING
DE8209420U 1982-04-02

Publications (3)

Publication Number Publication Date
EP0093859A2 true EP0093859A2 (en) 1983-11-16
EP0093859A3 EP0093859A3 (en) 1986-10-29
EP0093859B1 EP0093859B1 (en) 1989-06-21

Family

ID=6738673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102578A Expired EP0093859B1 (en) 1982-04-02 1983-03-16 Piston for the contactless sensing of the piston position

Country Status (2)

Country Link
EP (1) EP0093859B1 (en)
DE (2) DE8209420U1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507167A1 (en) * 1985-03-01 1986-09-04 Festo KG, 7300 Esslingen Short stroke cylinder actuator - has external sensors to detect piston position responding to permanent magnet
US4660460A (en) * 1985-07-29 1987-04-28 Allied Corporation Magnetic front seal for vacuum brake booster
EP0351317A1 (en) * 1988-07-13 1990-01-17 Automax Improved actuator
EP0631057A1 (en) * 1993-06-23 1994-12-28 Firma Carl Freudenberg Sealing for pneumatically operated piston
EP0721067A2 (en) * 1995-01-04 1996-07-10 Beetz Hydraulik GmbH Fluid-pressure actuator with a magnetic field sensor
DE29607993U1 (en) * 1996-05-03 1996-08-01 Festo Kg Piston for a working cylinder
EP0838616A2 (en) * 1996-10-28 1998-04-29 Hygrama Ag Piston for a pneumatic or hydraulic power cylinder
DE19651161C1 (en) * 1996-12-10 1998-06-04 Mannesmann Sachs Ag Plastic piston ring moulded onto piston for e.g. piston-cylinder damper unit
EP1058037A1 (en) * 1999-06-01 2000-12-06 Festo AG & Co Piston for a working cylinder and method of its manufacture
WO2007003311A2 (en) 2005-07-06 2007-01-11 Festo Ag & Co. Piston for a working cylinder
DE102010006631A1 (en) * 2010-02-02 2011-08-04 Rolls-Royce Deutschland Ltd & Co KG, 15827 Inductive sensor for use in e.g. torque sensor arrangement in aircraft power units, has iron core with end supported in holder, where part of core is projected from holder and is surrounded by coil, and end is turned towards magnets
EP3553327A4 (en) * 2016-12-06 2020-07-29 SMC Corporation Rod assembly and fluid pressure device
DE102021205951A1 (en) 2021-06-11 2022-12-15 Festo Se & Co. Kg Piston and fluid-operated power cylinder equipped therewith

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017213578A1 (en) * 2017-08-04 2019-02-07 BRUSS Sealing Systems GmbH Piston with at least one elastomeric seal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1123679A (en) * 1964-08-17 1968-08-14 Bosch Gmbh Robert Improvements in fluid pressure operated actuators

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1123679A (en) * 1964-08-17 1968-08-14 Bosch Gmbh Robert Improvements in fluid pressure operated actuators

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507167A1 (en) * 1985-03-01 1986-09-04 Festo KG, 7300 Esslingen Short stroke cylinder actuator - has external sensors to detect piston position responding to permanent magnet
US4660460A (en) * 1985-07-29 1987-04-28 Allied Corporation Magnetic front seal for vacuum brake booster
EP0351317A1 (en) * 1988-07-13 1990-01-17 Automax Improved actuator
EP0631057A1 (en) * 1993-06-23 1994-12-28 Firma Carl Freudenberg Sealing for pneumatically operated piston
EP0721067A3 (en) * 1995-01-04 1998-02-11 Beetz Hydraulik GmbH Fluid-pressure actuator with a magnetic field sensor
EP0721067A2 (en) * 1995-01-04 1996-07-10 Beetz Hydraulik GmbH Fluid-pressure actuator with a magnetic field sensor
US5813313A (en) * 1996-05-03 1998-09-29 Festo Kg Piston for a fluid power cylinder
DE29607993U1 (en) * 1996-05-03 1996-08-01 Festo Kg Piston for a working cylinder
DE19715858C2 (en) * 1996-05-03 1999-09-30 Festo Ag & Co Piston for a working cylinder
EP0838616A2 (en) * 1996-10-28 1998-04-29 Hygrama Ag Piston for a pneumatic or hydraulic power cylinder
EP0838616A3 (en) * 1996-10-28 1998-05-13 Hygrama Ag Piston for a pneumatic or hydraulic power cylinder
DE19651161C1 (en) * 1996-12-10 1998-06-04 Mannesmann Sachs Ag Plastic piston ring moulded onto piston for e.g. piston-cylinder damper unit
US6003227A (en) * 1996-12-10 1999-12-21 Mannesmann Sachs Ag Process for manufacturing a piston ring
EP1058037B1 (en) * 1999-06-01 2003-05-14 Festo AG & Co Piston for a working cylinder and method of its manufacture
DE19925083A1 (en) * 1999-06-01 2000-12-14 Festo Ag & Co Piston for a working cylinder and process for its manufacture
EP1058037A1 (en) * 1999-06-01 2000-12-06 Festo AG & Co Piston for a working cylinder and method of its manufacture
WO2007003311A2 (en) 2005-07-06 2007-01-11 Festo Ag & Co. Piston for a working cylinder
CN101218436B (en) * 2005-07-06 2011-08-10 费斯托股份有限两合公司 Piston for a working cylinder
DE102010006631A1 (en) * 2010-02-02 2011-08-04 Rolls-Royce Deutschland Ltd & Co KG, 15827 Inductive sensor for use in e.g. torque sensor arrangement in aircraft power units, has iron core with end supported in holder, where part of core is projected from holder and is surrounded by coil, and end is turned towards magnets
EP3553327A4 (en) * 2016-12-06 2020-07-29 SMC Corporation Rod assembly and fluid pressure device
US11143214B2 (en) 2016-12-06 2021-10-12 Smc Corporation Rod assembly and fluid pressure device
DE102021205951A1 (en) 2021-06-11 2022-12-15 Festo Se & Co. Kg Piston and fluid-operated power cylinder equipped therewith
US11821444B2 (en) 2021-06-11 2023-11-21 Festo Se & Co. Kg Piston and a fluid-actuated working cylinder provided therewith

Also Published As

Publication number Publication date
DE8209420U1 (en) 1983-09-15
EP0093859A3 (en) 1986-10-29
EP0093859B1 (en) 1989-06-21
DE3380096D1 (en) 1989-07-27

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