EP0254252B1 - Drehpotentiometer, insbesondere zur Verwendung als Drehstellungsmessfühler für die Drehstellung einer Welle - Google Patents

Drehpotentiometer, insbesondere zur Verwendung als Drehstellungsmessfühler für die Drehstellung einer Welle Download PDF

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Publication number
EP0254252B1
EP0254252B1 EP87110479A EP87110479A EP0254252B1 EP 0254252 B1 EP0254252 B1 EP 0254252B1 EP 87110479 A EP87110479 A EP 87110479A EP 87110479 A EP87110479 A EP 87110479A EP 0254252 B1 EP0254252 B1 EP 0254252B1
Authority
EP
European Patent Office
Prior art keywords
carrier
rotary potentiometer
spring
rotary
potentiometer according
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
EP87110479A
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German (de)
English (en)
French (fr)
Other versions
EP0254252A3 (en
EP0254252A2 (de
Inventor
Reinhard Hochholzer
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.)
Wilhelm Ruf KG
Original Assignee
Wilhelm Ruf KG
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Filing date
Publication date
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Application filed by Wilhelm Ruf KG filed Critical Wilhelm Ruf KG
Publication of EP0254252A2 publication Critical patent/EP0254252A2/de
Publication of EP0254252A3 publication Critical patent/EP0254252A3/de
Application granted granted Critical
Publication of EP0254252B1 publication Critical patent/EP0254252B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means

Definitions

  • the invention relates to a rotary potentiometer according to the preamble of claim 1.
  • Such rotary potentiometers are commercially available in a wide variety of designs, with the spring support usually being mounted in the housing with as little play as possible. If such a rotary potentiometer is to be used as a rotary position sensor, for example for the angular position of a shaft, the problem arises that the axis of rotation of the rotary potentiometer is not always aligned with the central axis of the shaft. There can be a so-called There is a "center offset" of the two axes. These two axes can also be tilted towards each other. This is unsatisfactory in mechanical and electrical terms. Mechanically, this easily leads to destruction.
  • the object of the invention is therefore to improve the rotary potentiometer of the type mentioned in such a way that it provides excellent linearity of its electrical output signals in relation to the rotary position over a long service life, even if the axis of rotation of the potentiometer is not the main axis of the potentiometer actuating shaft is aligned.
  • the rotary potentiometer has a housing 1, which is closed with a cover 2 with an integrated plug plate.
  • a resistance plate 3 is fixedly held in the housing, on which a spring support 4 is rotatably and oscillatingly mounted, specifically via a metal bearing bush 5, which in turn is held free of play by a bearing bush holder 6, the bearing bush holder 6 being free of play in an opening of the resistance support 3 is held.
  • a wiper spring 7 is attached to the spring carrier 4, which is designed here as a brush wiper spring and with two Brushes 57 is in sliding electrical contact with resistance tracks applied to the resistance plate.
  • the resistance carrier 3 is fixedly centered and held in a recess of the housing 1 by means of a “cage” 8, this cage 8 also serving as a support for a torsion spring 9 which is fastened at one end to the spring carrier 4.
  • the potentiometer is biased into an end position by this torsion spring 9.
  • three plugs 10 are soldered onto the resistance carrier 3. These plugs are in electrical connection with the mentioned resistance tracks. They protrude through the resistance carrier 3 and are soldered to the side facing the wiper spring 7.
  • the cover 2 is fastened to the housing 1 by means of rivets 11, a cavity between the cover and the side of the resistance carrier 3 facing it being completely filled with a sealing compound 12, so that the resistance carrier 3 is encapsulated in a watertight manner with respect to the cover 2.
  • the housing 1 has on its actuation side (bottom in FIG. 1) a central through opening 13 through which an actuation shaft (not shown) can engage in a blind bore 14 of the spring support 4.
  • Said actuating shaft is connected to a rotating part, the rotational position of which is to be detected by the rotary potentiometer according to the invention.
  • this is the pivot axis of the throttle valve of an internal combustion engine, the opening position of which is to be detected.
  • the rotary potentiometer is then flanged to the internal combustion engine by means of screws projecting through fastening openings 15. In practice, it is not always ensured that the main or rotational axis 16 of the rotary potentiometer is exactly aligned with the central axis of the rotary actuating shaft.
  • the spring support 4 is mounted such that it oscillates with respect to the resistance support 3, so that the axis of rotation of the spring support can oscillate or wobble with respect to the main axis of rotation 16.
  • the spring support 4 is held practically immovable in relation to the resistance support 3 in the axial direction (only the axial play required for the pendulum movement is present), with the result that the pressing force of the wiper spring 7 relative to the resistance support 3 only changes even when the spring support 4 swings out to the side changes minimally, so that the electrical contact resistance between the resistance tracks and the wiper spring is constant within very narrow limits. This is further favored by the relatively large length of the arms of the wiper spring.
  • the oscillating mounting is obtained by a flexible bearing pin 17, which is integrally formed here on the spring support 4.
  • the flexibility of the bearing pin 17 is obtained by the fact that it has slots 18 which run in the axial direction and are offset in the radial direction. Through these slots 18, the bearing pin 17 can be resiliently radially deformed, so that, as a result, the spring support can oscillate relative to the rigid bearing bush 5.
  • the bearing journal 17 In the axial direction, the bearing journal 17 is held relative to the bearing bush 5 by two radially outwardly projecting projections 19 and 20.
  • the collar 19 arranged at the free end of the bearing pin 17 can be pressed radially inward due to the slots 18, so that the bearing pin 17 can be inserted into the bearing bush 5 without problems and snaps or locks there. This insertion is facilitated by a chamfer 21 at the free end of the journal.
  • the lower collar 20 acts in the other direction opposite the opposite end face of the bearing bushing 5. Due to the spring force of the wiper spring 7, the spring support 4 is pushed away by the resistance support 3 to such an extent that the collar 19 of the bearing pin 17 abuts the corresponding end face of the bearing bushing 5 . As can be seen in Fig. 1, there is only a very slight play in the axial direction between the collar 20 and the corresponding end face of the bearing bush 5. This slight play is required to allow the pendulum movement of the journal 17.
  • the bearing bush 5 is made of metal for reasons of low wear. In order to be able to easily mount this bearing bush on the resistance carrier 3, it is inserted into the bearing bush holder 6 and locked there in the axial direction between two radially inwardly projecting edges 22 and 23 of the bearing bush holder 6 (cf. FIG. 11).
  • the bearing bush holder 6 is off elastic material such as plastic.
  • the bearing bush holder 6 is in turn snapped into an opening of the resistance carrier 3 and also by means of two axially spaced edges 24 and 25.
  • the spacing between these two edges 24 and 25 corresponds to the thickness or material thickness of the resistance carrier 3 said opening of the resistance carrier 3 can be inserted, it has on its outside radially protruding projections 26 which are inclined in the axial direction and are elastic in themselves, so that the bearing bush holder 6 can be snapped into the resistance carrier 3.
  • the exact shape of these projections 26 can be seen in FIGS. 11, 12 and 13.
  • the projections are arranged mirror-symmetrically in pairs and approximately crescent-shaped in plan view (FIG. 13).
  • the edges 25 of the projections 26 pointing in the direction of the resistance support 3 are slightly inclined, as a result of which a certain wedge effect is obtained.
  • the outer circumference of the upper part of the bearing bush holder 6 is designed to be slightly tapered, which is expressed in the angle (FIG. 12). With this arrangement described, the bearing bush is absolutely fixed and free of play on the resistance carrier 3.
  • the resistance support 3 must be firmly and correctly aligned relative to the housing 1 be kept.
  • the resistance carrier 3 is held in the cage 8 (housing insert).
  • This cage 8 (see also FIGS. 2, 4 and 9) is adapted to the shape of the resistance carrier 3 with regard to the contour of its outer wall.
  • the upper edge 27 of its outer wall 28 serves as a support for the resistance carrier 3.
  • spring arms 29 are provided on the outer wall 28 of the cage 8, which protrude beyond the upper edge 27 and with their inwardly facing surface a limitation for form a displacement of the resistance carrier 3.
  • the spring arms 29 have projections 30 projecting outward beyond the contour of the outer wall 28 (cf. in particular FIG. 10).
  • a central recess of the housing 1 is very precisely adapted to the outer contour of the outer wall 28, so that when the cage 8 is inserted into this central recess of the housing 1, the spring arms 29 are pressed inwards, as a result of which they are pressed against the end face of the resistance carrier 3 and tighten it tight. (see FIGS. 1 and 2).
  • An additional securing of the resistance carrier 3 in the cage 8, which is already effective during assembly, is also obtained in that the spring arms 29 have inwardly pointing projections 31 (see FIG. 10), behind which the resistance carrier 3 engages.
  • the spring arms 29 have additional, outwardly projecting ribs 32 (see FIG. 10) which are guided in correspondingly shaped recesses 33 in the housing 1.
  • These ribs can also (different from the representation of FIGS. 9 and 10) except for the Reach down the bottom of the cage and thus practically be projections of the outer wall 28 of the cage.
  • the cage 8 has an inner, cylindrical sleeve 34 (FIG. 9) which is at a distance from the cylindrical part 35 of the outer wall 28 and which does not extend in the axial direction up to Top edge 27 extends.
  • the torsion spring 9 is inserted into the intermediate space thus formed. With a radially outwardly projecting arm, the torsion spring 9 is supported between two ribs 37 and 38, these ribs adjoining the cylindrical part 35 with a passage opening for the arm 36 of the spring 9. (Fig. 4).
  • Another, axially extending arm 39 of the torsion spring 9 engages in a recess 52 provided on the outer circumference of the spring carrier 4 and thus prestresses the spring carrier in the direction of rotation in one direction.
  • the upper edge of the sleeve 34 of the cage 8 finally serves as a stop for the pendulum movement of the spring support, which can best be seen from FIGS. 1 and 2.
  • the spring support 4 has one or two rotation limit stops 40 on its outer circumference, which cooperate with corresponding stops 41 in the central through opening of the housing 1. Furthermore, these stops can also serve as a stop for limiting the range of rotation of the spring support 4.
  • the spring support 4 has opposite to the through opening 13 of the housing 1, a blind hole 42, in which two driver webs 43 and 44, starting from the cylindrical inner wall of the Sackboh tion 42 protrude.
  • the side surfaces 45, 46, 47 and 48 of the driver webs are inclined with respect to the central axis of rotation 16 (see the angle 49 in FIG. 6).
  • the driver shaft (not shown) rotates the spring support 4 counterclockwise (see Arrows in Fig. 3) so flat driver surfaces of the driver shaft come to rest on the side surfaces 46 and 48.
  • the spring support 4 shown in FIGS. 5 to 8 is designed with respect to the direction of rotation shown in FIG. 3 for the other direction of rotation, ie it is rotated clockwise in the direction seen from the actuating shaft. Accordingly, the surfaces 45 and 46 or 47 and 48 are interchanged with respect to FIG. 3.
  • protrusions 50 and 51 are provided on the inwardly facing wall of the blind bore 42 immediately in front of the contact surfaces 46 and 48 of the driver webs 43 and 44, which act as run-on surfaces for the "blade" of the rotary driver serve.
  • projections 50 and 51 lie directly opposite one another and, as a result, ensure that the spring support is tilted when the drive shaft is inclined or is deflected in an oscillating manner in the bearing bush.
  • the radially inward-facing surfaces of the projections 50 and 51 are also "undercut", ie the thickness of the projections decreases from the opening side towards the inside. The angle between these surfaces and the central axis is also approximately 3 °.
  • Fig. 6 can also be seen that the blind hole 42 is widened somewhat conically towards its opening in order to permit the wobbling movement of the spring carrier with respect to the driving shaft.
  • the projections 51 are rounded in the direction of the opening of the blind bore 42 (reference number 53) to facilitate insertion of the driver shaft.
  • the spring support has fastening projections 54 running parallel to the bearing pin 17 for fastening the wiper spring 7.
  • the wiper spring has corresponding openings through which the fastening projections 54 protrude. With a snap ring 55 which engages behind a collar of the fastening projections 54, the wiper spring is then held on the spring carrier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
EP87110479A 1986-07-22 1987-07-20 Drehpotentiometer, insbesondere zur Verwendung als Drehstellungsmessfühler für die Drehstellung einer Welle Expired - Lifetime EP0254252B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863624640 DE3624640A1 (de) 1986-07-22 1986-07-22 Drehpotentiometer, insbesondere zur verwendung als drehstellungsmessfuehler fuer die drehstellung einer welle
DE3624640 1986-07-22

Publications (3)

Publication Number Publication Date
EP0254252A2 EP0254252A2 (de) 1988-01-27
EP0254252A3 EP0254252A3 (en) 1989-11-15
EP0254252B1 true EP0254252B1 (de) 1992-03-25

Family

ID=6305647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110479A Expired - Lifetime EP0254252B1 (de) 1986-07-22 1987-07-20 Drehpotentiometer, insbesondere zur Verwendung als Drehstellungsmessfühler für die Drehstellung einer Welle

Country Status (3)

Country Link
US (1) US4812803A (enExample)
EP (1) EP0254252B1 (enExample)
DE (2) DE3624640A1 (enExample)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3736546A1 (de) * 1987-10-28 1989-05-18 Ruf Kg Wilhelm Drehpotentiometer
DE8907174U1 (de) * 1989-06-12 1989-09-28 A.B. Elektronik GmbH, 4712 Werne Drehpotentiometer mit Drehkörper und Antriebsvorrichtung
US5095298A (en) * 1990-12-13 1992-03-10 Bourns, Inc. Surface mount variable resistor with insert-molded slider
DE4221024C2 (de) * 1992-06-26 1995-11-30 Ruf Kg Wilhelm Haltevorrichtung zur Lagerung eines durch eine drehbare Welle betätigbaren elektrischen Bauteils an einem Gegenstand
US5460035A (en) * 1993-06-23 1995-10-24 Cts Corporation Bearing free spring free throttle position sensor
US5539373A (en) * 1993-11-08 1996-07-23 Cts Corporation Rotor structure for a position sensor
JPH08153608A (ja) * 1994-09-30 1996-06-11 Aisin Seiki Co Ltd 可変抵抗器
ES2112779B1 (es) * 1995-11-29 1998-11-01 Aragonesa Comp Potenciometro perfeccionado.
DE29611890U1 (de) * 1996-07-09 1996-09-12 Hella KG Hueck & Co., 59557 Lippstadt Drehsensor
DE19627556A1 (de) * 1996-07-09 1998-01-15 Hella Kg Hueck & Co Widerstandsdrehsensor
DE19632766A1 (de) * 1996-08-14 1998-02-19 Preh Elektro Feinmechanik Drehwinkelsensor zur Drehwinkelanzeige mehrerer Umdrehungen einer Welle
DE19843770A1 (de) * 1998-09-24 2000-03-30 Mannesmann Vdo Ag Einrichtung zur Kontaktierung einer Platine
JP2000193412A (ja) * 1998-12-24 2000-07-14 Alps Electric Co Ltd 回転型センサ
JP3612242B2 (ja) * 1999-06-21 2005-01-19 アルプス電気株式会社 回転型センサ
JP4414027B2 (ja) * 1999-09-03 2010-02-10 本田技研工業株式会社 エンジンの吸気装置
US6639508B1 (en) 1999-09-22 2003-10-28 Aptek Williams, Inc. Electrical switch device and process for manufacturing same
US6580352B1 (en) 1999-11-19 2003-06-17 Aptek William, Inc. Manual control apparatus and method
US6622589B1 (en) 1999-11-19 2003-09-23 Aptek Williams, Inc. Manual control apparatus
US6492807B2 (en) * 2001-02-06 2002-12-10 Siemens Vdo Automotive Corporation Absolute angle sensor for multi-turn shaft
FR2903658B1 (fr) * 2006-07-12 2008-09-26 Airbus France Sas Systeme de commandes de vol et de commande de direction au sol pour aeronef.
DE102007046787B4 (de) * 2007-09-29 2014-05-15 Hella Kgaa Hueck & Co. Drehsensor mit Schleiferfedern
US20150114347A1 (en) * 2013-10-30 2015-04-30 Holley Performance Products Inc. Throttle Position Sensor (TPS) Clocker
RU173328U1 (ru) * 2017-03-28 2017-08-22 Открытое акционерное общество "КБ Электроприбор" Датчик углового положения

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7216447U (de) * 1972-08-31 Hanning R Elektro Werke Kupplungsanordnung zur Verbindung der Motorwelle eines Ölbrennermotors mit der Pumpenwelle einer Ölförderpumpe
DE3130273C2 (de) * 1981-07-31 1983-11-10 Brown, Boveri & Cie Ag, 6800 Mannheim Drehpotentiometer
GB2122033A (en) * 1982-06-11 1984-01-04 Welwyn Electronics Ltd Rotary potentiometer
US4616504A (en) * 1983-05-03 1986-10-14 Duncan Electronics Throttle position sensor
US4623868A (en) * 1984-01-10 1986-11-18 Crystalate Electronics Limited Variable electrical resistance device
DE3444229A1 (de) * 1984-11-30 1986-06-05 Preh, Elektrofeinmechanische Werke Jakob Preh Nachf. Gmbh & Co, 8740 Bad Neustadt Einstellbarer widerstand
DE3524308A1 (de) * 1985-07-06 1987-01-15 Ruf Kg Wilhelm Dreh - potentiometer

Also Published As

Publication number Publication date
EP0254252A3 (en) 1989-11-15
DE3777712D1 (de) 1992-04-30
US4812803A (en) 1989-03-14
DE3624640C2 (enExample) 1990-12-06
DE3624640A1 (de) 1988-01-28
EP0254252A2 (de) 1988-01-27

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