EP0268030B1 - Potentiomètre respectivement résistance variable - Google Patents

Potentiomètre respectivement résistance variable Download PDF

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Publication number
EP0268030B1
EP0268030B1 EP87112533A EP87112533A EP0268030B1 EP 0268030 B1 EP0268030 B1 EP 0268030B1 EP 87112533 A EP87112533 A EP 87112533A EP 87112533 A EP87112533 A EP 87112533A EP 0268030 B1 EP0268030 B1 EP 0268030B1
Authority
EP
European Patent Office
Prior art keywords
piston
contact member
working cylinder
potentiometer
piston rod
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
EP87112533A
Other languages
German (de)
English (en)
Other versions
EP0268030A2 (fr
EP0268030A3 (en
Inventor
Helmut Göttling
Ralf Kook
Rudolf Ing. grad. Möller
Peter Müller
Gerhard Ing. Grad. Scharnowski
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.)
Aventics GmbH
Original Assignee
Mannesmann Rexroth Pneumatik 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 Mannesmann Rexroth Pneumatik GmbH filed Critical Mannesmann Rexroth Pneumatik GmbH
Priority to AT87112533T priority Critical patent/ATE77711T1/de
Publication of EP0268030A2 publication Critical patent/EP0268030A2/fr
Publication of EP0268030A3 publication Critical patent/EP0268030A3/de
Application granted granted Critical
Publication of EP0268030B1 publication Critical patent/EP0268030B1/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
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2853—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using potentiometers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path

Definitions

  • the invention relates to a potentiometer arrangement for detecting the position of the piston of a pressure medium-operated working cylinder according to the preamble of claims 1 and 5.
  • a potentiometer is known from DE 35 20 199 A1, which consists of a resistance track and a contact member that can be guided along the resistance track by means of an actuating member.
  • the actuator consists of a rod-shaped body.
  • the resistance track and the contact member connected to the rod-shaped body are arranged in a housing in order to protect the resistance track and the contact member from dust and moisture.
  • the actuator designed as a rod-shaped body is sealed by an opening provided in the housing and is led out of the housing. If the potentiometer is used, for example, to detect the position of the piston of a working cylinder, it is necessary to arrange the part carrying the resistance track on the cylinder and to connect the actuating member to the piston or to the piston rod of the working cylinder.
  • a rigid coupling of the contact member to the piston rod of a working cylinder is known from EP O 177 693.
  • the resistance tracks are arranged within a tube which is open at the end and which is connected at one end to the cylinder cover.
  • the piston rod is pierced, so that it can be telescopically pushed onto the tube containing the resistance tracks.
  • the contact member is connected to the piston rod via a coupling rod which is arranged inside the pierced piston rod. This moves the contact element depending on the piston movement.
  • a seal is required for the pierced piston rod and the open tube in which the resistance tracks are arranged, which seal is also provided in this known potentiometer.
  • the arrangement of additional seals on the one hand, requires more assembly work and, on the other hand, the need to replace the seals from time to time.
  • the object of the invention is to create a potentiometer device for pressure-operated working cylinders, in which a contactless coupling between the actuating and contact element is made possible without the use of additional seals and can also be integrated in a working cylinder and a further potentiometer device create that using the non-contact Coupling can be attached externally to a matching working cylinder.
  • the invention offers in particular the advantage of obtaining a potentiometer or a variable resistor with an actuating element for the contact element which operates in a contactless manner with respect to the contact element. Because there is no longer a mechanical connection between the contact element and the actuating element, the actuating element and the device connected to the actuating element, such as, for example, the piston or the piston rod of a working cylinder, can be rotated relative to the piston element and to the resistance path and thus also to the cylinder.
  • the fact that the tubular body is sealed so as to be pressure-tight, and that the bore in the piston rod extending in the axial direction is designed as a blind bore, have the advantage that, in combination with the magnetic actuation of the contact element, additional seals in the area of the piston rod or the tubular body can be dispensed with.
  • the arrangement of a blind hole instead of a through hole ensures that seals between the piston rod and the tubular body to prevent a pressure medium short circuit between the pressure chamber in front of the piston and behind the piston are unnecessary.
  • the contact element in the potentiometer or variable resistor according to the invention is designed in such a way that it contains the permanent magnet, then the potentiometer or the variable resistor for determining the position of the piston of a working cylinder can also be arranged retrospectively on each working cylinder, the piston of which is at least partially made of a ferromagnetic Material exists. It is no longer necessary to establish a mechanical connection between the piston rod and the actuator for actuating the potentiometer or the variable resistance.
  • Fig. 1 shows a working cylinder (1) in which a piston (8) connected to a piston rod (4) is arranged displaceably and sealed.
  • the piston (8) divides the working cylinder (1) into a first pressure medium chamber (3) on the piston rod side and a second pressure medium chamber (12) opposite the first pressure medium chamber (3) on the other side of the piston (8).
  • the two pressure medium chambers (3, 12) can each be connected to a pressure medium source via a pressure medium connection (2) or (11) and a valve device (not shown).
  • the piston rod (4) has a preferably cylindrical recess (5) running in the direction of its longitudinal axis, which begins at the end of the piston rod (4) that extends into the cylinder (1) and moves in the manner of a blind bore in the direction of the through a recess (24) provided in the cylinder bottom extends from the end region of the piston rod (4) which is led out of the working cylinder (1).
  • the piston (8) and the piston rod (4) are designed and connected to one another in such a way that the end of the piston rod (4) inside the working cylinder (1) is guided centrally through the piston (8).
  • a tubular body (6) made of a non-magnetizable material, such as. As aluminum or plastic, arranged in a fixed position, which is inserted into the recess (5) of the piston rod (4).
  • the tubular body (6) is closed at its free end in the recess (5) of the piston rod (4) by a base (23), so that the interior of the tubular body (6) is closed off from the second pressure medium chamber (12) .
  • a permanent magnet (10) which serves as an actuating element and is mounted in a groove (9) of the piston rod (4) facing the tubular body (6), surrounds the tubular body (6) in a ring-like manner.
  • a carrier (19) preferably made of plastic, for a resistance track (13) and a conductor (18) is arranged in the tubular body (6).
  • the carrier (19) can consist of two identically designed parts (19a) and (19b) arranged symmetrically to one another.
  • the outer contour of the carrier (19) is adapted to the inner wall of the tubular body (6).
  • Grooves (26, 27) are provided in the support (19) in the direction of the longitudinal axis of the support (19) and are used to guide a contact element.
  • the contact member is composed of a slide (22) made of a ferromagnetic material and two sliding contacts (15, 16).
  • the resistance track (13) and the conductor (18) are inserted parallel to the longitudinal axis of the slide (22) in corresponding grooves of the parts (19a, 19b) and arranged to the slide (22) so that the resistance track (13) with the sliding contact (15) and the conductor (18) cooperates with the sliding contact (16).
  • the slide (22) for the sliding contacts (15, 16) has, as shown in Fig. 2, an approximately cruciform profile and has a stepped part in its free end region for fastening the resiliently on the resistance track (13) and the conductor (18th ) adjacent sliding contacts (15, 16).
  • Electrical lines (7, 17, 14) are connected to the resistance track (13) and the conductor (18) and lead to a plug (21) arranged on the working cylinder (1).
  • Fig. 3 shows a working cylinder with an integrated potentiometer, wherein the actuator consists of a ferromagnetic material and is arranged in the piston of the working cylinder.
  • the actuator consists of a ferromagnetic material and is arranged in the piston of the working cylinder.
  • a piston (8) connected to a piston rod (4) is arranged displaceably and sealed in a working cylinder (1).
  • the piston (8) divides the working cylinder (1) into a piston rod-side pressure medium chamber (3) and a second pressure medium chamber (12) arranged opposite the first pressure medium chamber (3) on the other side of the piston (8).
  • the two pressure medium chambers (3, 12) can each be connected to a pressure medium source via a pressure medium connection (2) or (11) and a valve device (not shown).
  • the piston rod (4) has a preferably cylindrical recess (5) running in the direction of its longitudinal axis, which begins at the end of the piston rod (4) extending into the cylinder (1) and moves in the manner of a blind bore in the direction of the through a recess (24) provided in the cylinder bottom extends from the end region of the piston rod (4) which is led out of the working cylinder (1).
  • the piston (8) and the piston rod (4) are designed and connected to one another in such a way that the end of the piston rod (4) inside the working cylinder (1) is guided centrally through the piston (8) and ends with the side of the piston (8) delimiting the second pressure medium chamber (12).
  • a tubular body (6) made of a non-magnetizable material, for. As aluminum or plastic, arranged in a stationary manner, which extends into the recess (5) of the piston rod (4).
  • the tubular body (6) is closed at its free end in the recess (5) of the piston rod (4) by a base (23), so that the interior of the tubular body (6) is closed off from the second pressure medium chamber (12) .
  • a carrier (19), preferably made of plastic, for a resistance track (13) and a conductor (18) is arranged in the tubular body (6).
  • the outer contour of the carrier (19) is adapted to the inner wall of the tubular body (6).
  • the carrier (19) is additionally designed as a guide device (25) for a contact member.
  • the guide device which serves as a guide means for guiding the contact element, which is driven by an actuating element in a contactless manner under the influence of magnetic forces, is thus arranged in a stationary manner with respect to the resistance track. For this purpose, it has grooves running in the direction of its longitudinal axis.
  • the contact member is composed of a permanent magnet designed as a sliding piece (22) and two sliding contacts (15, 16) arranged thereon.
  • the piston (8) has a ferromagnetic element (9a) which serves to actuate or to take the slide (22).
  • a separate disk-shaped body as an actuator on the piston if the piston itself is made of a disk-shaped carrier made of a ferromagnetic material, such as, for. B. steel, and a ring-shaped sealing element surrounding the carrier.
  • the actuating member consists of a ferromagnetic material or contains a ferromagnetic material
  • the contact member consists of a magnetic material or contains a magnetic material
  • Fig. 4 shows a part of a working cylinder, which is composed of a cylinder (39), a bottom (33), a cover (25) and a piston (40) with a piston rod (43) which is sealed in the cylinder (39).
  • the base (33) and the cover (25) are arranged on the two opposite ends of the cylinder (39) and are clamped to the cylinder (39) by means of tie rods connecting the base (33) and the cover (25).
  • tie rod (27) is on the one hand through a bore (36) running parallel to the longitudinal axis of the cylinder (39), which is arranged in a part of the base (33) protruding beyond the cylinder jacket, and on the other hand through a bore parallel to the longitudinal axis of the cylinder (39 ) extending bore (26) in a part of the cover (25) protruding beyond the cylinder jacket.
  • Nuts (38, 44) the bottom (33) and the cover (25) are held on the end faces of the cylinder (39).
  • the tie rod (27) has a recess (29) running in the direction of its longitudinal axis, in which a potentiometer consisting of a resistance track (28), feedback (31) and contact element (30) is arranged.
  • the housing of the potentiometer is formed by the tie rod (27).
  • the contact member (30) designed as a sliding contact consists of a ferromagnetic material. Permanent magnets (41, 42) arranged on the piston (40) serve as the actuating element for the contact element (30).
  • the resistance track (28) and the feedback (31) of the potentiometer are connected via connecting wires (34, 35) to a plug (32) which is arranged on the bottom (33) of the working cylinder.
  • the invention naturally extends not only to the exemplary embodiments described, but also permits a large number of variants.
  • the contact member and the actuating member with at least one permanent magnet each.
  • the contact member can be self-supporting, so that a support for the sliding contacts can be dispensed with.
  • the contacts (such as sliding contacts) either consist of a ferromagnetic material or made of a magnetic material and are shaped in such a way that they can be guided along the resistance track in a manner such that they cannot twist and tip over.
  • the invention can be applied both to a potentiometer and to a variable resistor.
  • the individual components of the potentiometer or the variable resistor can be arranged in a housing, so that an independent device is created which can be attached to or installed in devices and equipment for a wide variety of purposes.
  • the resistor track and the contact member-containing housing slidably an annular body containing a permanent magnet or a ferromagnetic part may be arranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Adjustable Resistors (AREA)
  • Control Of Eletrric Generators (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (5)

  1. Agencement de potentiomètre pour des détecter la position du piston d'un cylindre de travail alimenté par un fluide sous pression, avec une piste résistante et un organe de contact guidé de façon à pouvoir coulisser le long de la piste résistante, et qui est susceptible d'être déplacé sans contact par l'intermédiaire d'éléments de couplage à aimants permanents, agencement de potentiomètre caractérisé en ce que :
    - pour l'intégration dans un cylindre de travail (1), la piste résistante et l'organe de contact (22, 15, 16) sont disposés dans la chambre du cylindre à l'intérieur d'un corps de forme tubulaire (6) fermé d'une façon étanche au fluide sous pression par un fond (23),
    - le corps de forme tubulaire (6) est relié par sa face frontale opposée au fond (23) au couvercle (20) du cylindre de travail (1), et il est constitué d'un matériau non magnétisable,
    - la tige de piston (4) du cylindre de travail (1) est munie d'un perçage borgne (5) s'étendant en direction axiale, et qui reçoit le corps de forme tubulaire (6) dans toutes positions de déplacement du piston (8).
  2. Agencement de potentiomètre selon la revendication 1, caractérisé en ce que l'organe de contact (22, 15, 16) comprend un coulisseau (22) en un matériau ferromagnétique, tandis que la tige de piston (4) est munie à son extrémité d'un aimant permanent (10).
  3. Agencement de potentiomètre selon la revendication 1, caractérisé en ce que l'organe de contact (22, 15, 16) comprend un coulisseau (22) en un matériau magnétique permanent, tandis que le piston (8) est muni d'un élément ferromagnétique (9a).
  4. Agencement de potentiomètre selon la revendication 3, caractérisé en ce que le piston (8) lui-même est constitué par un support en forme de disque en un matériau ferromagnétique et par un élément d'étanchement entourant à la façon d'un anneau, ce support.
  5. Agencement de potentiomètre pour détecter la position du piston d'un cylindre de travail alimenté par du fluide sous pression, avec une piste résistante et un organe de contact guidé de façon à pouvoir coulisser le long de cette piste résistante, et qui est susceptible d'être déplacé sans contact par l'intermédiaire d'éléments de couplage magnétiques permanents, pour un cylindre de travail qui comporte un piston relié à une tige de piston ainsi qu'un fond et un couvercle reliés par des tirants, agencement de potentiomètre caractérisé en ce que le tirant (27) comporte un évidement (29) s'étendant en direction axiale, en ce que, dans cet évidement (29) sont disposés la piste résistante (28) et l'organe de contact (30) guidé de façon à pouvoir coulisser, et en ce que l'organe de manoeuvre (41, 42) pour l'organe de contact (30) est disposé sur le piston (40).
EP87112533A 1986-11-15 1987-08-28 Potentiomètre respectivement résistance variable Expired - Lifetime EP0268030B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87112533T ATE77711T1 (de) 1986-11-15 1987-08-28 Potentiometer bzw. veraenderbarer widerstand.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863639150 DE3639150A1 (de) 1986-11-15 1986-11-15 Potentiometer bzw. veraenderbarer widerstand
DE3639150 1986-11-15

Publications (3)

Publication Number Publication Date
EP0268030A2 EP0268030A2 (fr) 1988-05-25
EP0268030A3 EP0268030A3 (en) 1989-11-29
EP0268030B1 true EP0268030B1 (fr) 1992-06-24

Family

ID=6314078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112533A Expired - Lifetime EP0268030B1 (fr) 1986-11-15 1987-08-28 Potentiomètre respectivement résistance variable

Country Status (4)

Country Link
US (1) US4910491A (fr)
EP (1) EP0268030B1 (fr)
AT (1) ATE77711T1 (fr)
DE (2) DE3639150A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015720A1 (de) * 1990-05-16 1992-04-09 Helag Electronic Gmbh Elektrischer weg- oder winkelsensor
DE4105703A1 (de) * 1991-02-21 1992-08-27 Mannesmann Ag Potentiometereinrichtung
DE4105702A1 (de) * 1991-02-21 1992-09-03 Mannesmann Ag Linearer wegaufnehmer
DE4141739A1 (de) * 1991-12-13 1993-06-17 Mannesmann Ag Verfahren zum betrieb einer resistiven wegmesseinheit
US5589664A (en) * 1993-09-21 1996-12-31 Temper Corporation Apparatus for containing electrical components for sensing or measuring magnetic fields
DE19606609A1 (de) * 1996-02-22 1997-08-28 Claas Ohg Hydraulische Lenkvorrichtung für selbstfahrende Arbeitsmaschinen
EP1264991B1 (fr) * 2001-06-07 2009-10-28 Gefran S.p.A. Arrangement d'un détecteur de position dans une unité piston-cylindre
DE102007046139A1 (de) * 2007-09-27 2009-04-02 Deere & Company, Moline Messvorrichtung und Messverfahren
US11248427B2 (en) 2018-08-06 2022-02-15 Schlumberger Technology Corporation Systems and methods for manipulating wellbore completion products

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5821126Y2 (ja) * 1976-08-06 1983-05-04 電気音響株式会社 ポテンシヨメ−タ
US4125821A (en) * 1977-08-05 1978-11-14 Denki Onkyo Company, Limited Potentiometer providing a non-linear output
JPS5487561A (en) * 1977-12-23 1979-07-12 Aisin Seiki Oil level detector
JPS57162405A (en) * 1981-03-31 1982-10-06 Kogyo Gijutsuin Noncontact potentiometer
DE3149516A1 (de) * 1981-12-14 1983-07-07 Wabco Steuerungstechnik GmbH & Co, 3000 Hannover Einrichtung zum erfassen der kolbenstellung eines zylinders
DE3241525A1 (de) * 1982-11-10 1984-05-10 Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover Einrichtung zum erfassen der position oder/und der geschwindigkeit des kolbens eines arbeitszylinders
US4479107A (en) * 1982-11-24 1984-10-23 Cts Corporation Precision linear potentiometer sensor
SE436072B (sv) * 1983-03-22 1984-11-05 Hara Ab Potentiometeranordning for legesbestemning av hydraulkolvar och liknande
DE3325400C2 (de) * 1983-07-14 1986-04-10 Integral Hydraulik & Co, 4000 Düsseldorf Hydraulik-Zylinder mit innenliegender Wegumformung
JPS6160135U (fr) * 1984-09-27 1986-04-23
DE3520199A1 (de) * 1984-10-05 1986-04-10 Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover Potentiometer
DE3442879C2 (de) * 1984-11-24 1994-09-01 Wabco Vermoegensverwaltung Einrichtung zum Erfassen der relativen Position von zwei relativ zueinander bewegbaren Teilen

Also Published As

Publication number Publication date
DE3780001D1 (de) 1992-07-30
US4910491A (en) 1990-03-20
ATE77711T1 (de) 1992-07-15
EP0268030A2 (fr) 1988-05-25
EP0268030A3 (en) 1989-11-29
DE3639150A1 (de) 1988-05-19

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