EP0288930B1 - Potentiomètre - Google Patents

Potentiomètre Download PDF

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Publication number
EP0288930B1
EP0288930B1 EP88106506A EP88106506A EP0288930B1 EP 0288930 B1 EP0288930 B1 EP 0288930B1 EP 88106506 A EP88106506 A EP 88106506A EP 88106506 A EP88106506 A EP 88106506A EP 0288930 B1 EP0288930 B1 EP 0288930B1
Authority
EP
European Patent Office
Prior art keywords
housing
potentiometer
spring
interior
elastic damping
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
EP88106506A
Other languages
German (de)
English (en)
Other versions
EP0288930A2 (fr
EP0288930A3 (en
Inventor
Werner Flierl
Horst Pissulla
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
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 Wilhelm Ruf KG filed Critical Wilhelm Ruf KG
Priority to AT88106506T priority Critical patent/ATE88035T1/de
Publication of EP0288930A2 publication Critical patent/EP0288930A2/fr
Publication of EP0288930A3 publication Critical patent/EP0288930A3/de
Application granted granted Critical
Publication of EP0288930B1 publication Critical patent/EP0288930B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/022—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being openable or separable from the resistive element

Definitions

  • the invention relates to a potentiometer according to the preamble of claim 1.
  • the US-PS 3 138 777 shows a linear potentiometer with a housing and a housing cover, which are telescopically displaceable against each other.
  • the housing cover that crosses the outside of the housing is guided on the outside of the housing by means of an additionally provided slide bearing.
  • a flange is attached to the housing with which the potentiometer can be attached to an object.
  • the potentiometer has the usual resistance plate with resistance tracks and electrical connecting wires, which are firmly connected to the housing here.
  • a spring support with sliding contacts that can slide along the resistance path is firmly connected to the housing cover and by means of a slide that penetrates the end wall of the housing cover and is accessible from the outside.
  • the housing and the housing cover are connected to each other by a bellows-like, flexible seal that completely protects the slide bearing between the housing cover and housing against the ingress of water.
  • the housing cover only in the actuation direction, i.e. H. is linearly displaceable relative to the housing, but is otherwise coupled in terms of vibration to the housing via the slide bearing 22, so that when the potentiometer is flanged onto a vibrating object, all vibrations are also transmitted to the outer housing.
  • the US-PS 4 053 865 shows a linear potentiometer, in which a slide is resiliently coupled to the spring support.
  • the spring support has a bore into which an extension of the slide engages, the diameter of the bore being larger than the diameter of the extension.
  • An elastic O-ring and a washer which is pressed against a stop by the O-ring, provide a coupling between the spring support and the slide, the misalignment can compensate within certain limits. For this it is of course a prerequisite that a front cover, through which the slide protrudes, allows sufficient play for movements of the slide.
  • this document also does not help to solve the vibration problem, since there is no vibration decoupling between the potentiometer and its wearing parts when the potentiometer is installed.
  • the potentiometer according to the present application should u. a. can also be used as a measuring transducer or measuring sensor in control systems in which the position of a movable member is sensed and the potentiometer then emits an electrical output signal proportional to this position.
  • a potentiometer can sense the position of a throttle valve on an internal combustion engine.
  • the potentiometer is attached to another object, for example directly on the engine block of an internal combustion engine.
  • the potentiometer also makes all movements and in particular vibrations of this other object.
  • the resistance layer was inside rubbed through from 3 to 4 hours. The potentiometer was then no longer usable.
  • the object of the present invention is therefore to improve the potentiometer of the type mentioned at the outset in such a way that it has a significantly longer service life when it is attached to mechanically vibrating objects and is therefore exposed to high accelerations.
  • the basic idea of the invention is to no longer decouple the entire potentiometer in terms of vibration from the other object (eg engine block), but only certain parts. These are the parts that are subject to wear. Because the outer case is firm is connected to the other object, the spatial position between the potentiometer and the other object is clearly defined, so that adjustment can be largely eliminated and installation errors avoided.
  • tightening the fastening screws against the force of the rubber buffer also leads to a change in the spatial position between the potentiometer and the engine block and thus to a different adjustment.
  • Claim 5 provides a further improvement in the damping behavior and also a good possibility of precisely aligning the inner and outer housings with one another, which is further improved with the features of claim 6.
  • the exemplary embodiment described is a so-called linear potentiometer, in which the actuating member (which can be actuated from the outside) is displaced in a straight line or linear manner. It is clear to the person skilled in the art that the invention can also be used in the same way for rotary potentiometers and spindle potentiometers.
  • the potentiometer has an outer housing 10 which is essentially cylindrical and has a flange 11 which projects radially approximately in its center and which has through holes 12 running in the axial direction and having an injected metal bushing 13. By means of these through holes 12, the outer housing 10 can be screwed onto another object.
  • the outer housing 10 is open on one side and is closed on the open side by a snap-in cover 14 by snapping this cover behind a latch 16.
  • a housing base 15 On the closed side there is a housing base 15 which is integrally connected to the outer housing 10.
  • the outer housing 10 has a radially projecting plug socket 18 with three flat plugs 19, which are held at a distance from one another in the plug socket, for example are injected there if the housing and the socket are a plastic injection molded part.
  • the inner wall of the outer housing - with the exception of the area to which the plug socket 18 connects - is cylindrical.
  • an inner housing 20 is inserted, which extends coaxially to the outer housing 10 and whose outer diameter is smaller than the inner diameter of the outer housing 10, so that an annular space 21 is present between the two housings 10 and 20.
  • This intermediate space enables a certain relative displacement between the inner and outer housing in a radial direction, that is to say perpendicular to the longitudinal axis of the potentiometer.
  • the inner housing 20 is integrally connected on its one end face, which is referred to below as the actuation side, to an essentially cylindrical bearing flange 22, a plain bearing bush 23 being pressed or injected into this bearing flange.
  • the side opposite the actuating side of the inner housing 20 is closed by an insertable cover 24.
  • the surface of this cover 24 facing outwards in the axial direction is arranged at a distance from the surface of the housing base 15 pointing inwards, so that the inner housing 20 can also be relatively displaced in the axial direction relative to the outer housing 10.
  • a corresponding axial distance 26 is also present on the actuating side between the cover 14 of the outer housing and a connecting web 25 which connects the cylindrical part of the inner housing to the bearing flange 22.
  • a spring-elastic damping element 27 or 27 ' is now provided, which in The illustrated embodiment is an O-ring that holds the inner housing 20 relative to the outer housing 10.
  • the inner housing 20 has a right-angled step 28 on the connecting web 25 (FIG. 1), so that the O-ring 27 both on a radially outwardly facing surface and on a surface this is right-angled in the axial direction.
  • the cover 24 has a step 29, the surface of which faces in the axial direction is just flush with the end face of the inner housing 20. So that the O-ring 27 'there is also at two mutually perpendicular surfaces of the lid 24 or outer housing 20.
  • the O-ring 27 is located on the actuating side on the one hand on the radially inwardly facing wall of the outer housing 10 and on the axially facing surface of the cover 14, so that the outer housing 20 (including the cover 14) also perpendicular contact surfaces with the O -Ring 27 has. Finally, the same also applies to the O-ring 27 ', which bears against the radially inwardly facing surface of the outer housing 10 and the axially inwardly facing surface of the housing base 15.
  • the two resilient damping elements 27 and 27 'fix on the one hand the inner housing 20 in the outer housing 10 and on the other hand allow due to their resilient properties a certain relative displacement between the inner and outer housing, whereby they strongly dampen vibrations or shocks that act on the outer housing due to their material properties , so that the inner housing is only very weakly influenced by such vibrations or shocks.
  • the spring-elastic damping elements also have the greatest possible distance from one another in the axial direction of the inner housing, the greatest possible clamping length is obtained and thus the best possible vibration damping of the inner housing.
  • An actuating member 30 is mounted in the inner housing, which here consists of a slide 31 and a spring support 32.
  • the slide is designed here as a cylindrical component and guided in the plain bearing bush 23.
  • the spring support 32 is attached to one end of the slider. It carries one or more wiper springs 33 which are in contact with their free end on predetermined tracks of a resistance plate 40 and slide along these tracks when the spring carrier is moved.
  • the spring support is prestressed in one direction by means of compression springs 34.
  • These compression springs are supported on the one hand on the inner housing or here specifically on a pin 35 'on the cover 24 of the inner housing and on the other hand on the spring support, where they are guided by pins 35.
  • the spring support 32 is also guided in the inner housing 20 such that it cannot rotate, in grooves 36 running parallel to the axial direction, in which laterally projecting arms 37 of the spring support 32 are guided, the compression spring 34 also being in these grooves are led.
  • the already mentioned resistance plate 40 is also fastened in the inner housing 20 and here carries resistance tracks 41, along which the wiper spring 33 can slide. These resistance tracks are connected to connection tabs 42, which are also attached to the resistance plate 40 and are designed here as contact springs, since they are only pressed with spring force against the ends of the resistance tracks.
  • these terminal lugs 42 are inserted through the resistance plate 40 and then bent over so that they run with a section parallel to the resistance plate. At their end they are then again bent essentially at right angles from the resistance plate and formed into a clamp 43.
  • the necessary electrical connection between the terminal lug 42 and the associated tab 19 is made via a flexible strand 44, which is laid in an S-shape.
  • the strand 44 is soldered to the connecting lug 42 and to the tab 19 at soldering points 45 and 46.
  • the strand 44 is still mechanically clamped in the area of its two ends, on the one hand by the clamp 43 on the connecting lug 42 and on the other hand by another Terminal 47 on the socket 18.
  • the socket 18 is rigidly connected to the outer housing 10, while the resistance plate 40 and thus the terminal lug 42 is rigidly connected to the inner housing 20, so that the strand 44 vibrates or between the two relative to each other moving housings 10 and 20 lies.
  • it must of course not form a mechanical vibration coupling, which is achieved through its mechanical flexibility and its laying in an S-shape.
  • it must of course be connected at its two ends as firmly as possible to the component assigned in each case, so that the potentiometer does not fail due to the wire breaking.
  • the inner housing 20 and all functional components such as resistance plate 40, wiper support 32 and slide 31 arranged in the inner housing are vibrationally decoupled from the outer housing 10.
  • care must be taken to ensure that the vibrations of the engine block via the actuating member and here in particular the slide 31 are not coupled back onto the inner housing and the parts located there.
  • the coupling or connection between the slide 31 and a part of this other object must also be carried out in terms of vibration.
  • a magnetic coupling can be provided, which at least transmits at least high-frequency vibrations or movements with strong acceleration or with a strong change in acceleration (jerk) to the slide 31 in a damped manner.
  • the slider 31 is to sense the position of a component due to its axial position. If this component is itself a rod, it is sufficient for a correct connection if the ends of the slide 31 and the rod touch each other, but can be moved in the radial direction (with respect to the axis of the slide 31). This already provides a vibration decoupling in the radial direction. Furthermore, it will be ensured that the above-mentioned rod is in turn vibration-damped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Adjustable Resistors (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Saccharide Compounds (AREA)
  • Details Of Resistors (AREA)

Claims (8)

  1. Potentiomètre avec:
    - un boîtier présentant des parties de boîtier déplaçables les unes par rapport aux autres et reliées au moyen d'un élément élastique (27, 27'),
    - une bride (11) montée sur le boîtier, destinée à assurer la fixation du potentiomètre sur un autre objet, tel que, par exemple, un bloc moteur d'un moteur à combustion interne,
    - un organe d'actionnement (30) mobile par rapport au boîtier,
    - une plaque de résistance (40), maintenue dans le boîtier,
    - un curseur (33) couplé à l'organe d'actionnement, et glissant lors de son déplacement, le long d'un trajet (41) défini sur la plaque de résistance (40), et
    - comportant plusieurs raccordements électriques (19) dont l'un est relié électriquement au curseur et dont au moins un autre est relié électriquement au trajet défini,
    caractérise en ce que,
    - les parties de boîtier sont réalisées sous forme d'un boîtier extérieur (10) et d'un boîtier intérieur (20) disposé à l'intérieur du boîtier extérieur (10),
    - le boîtier intérieur (20) est monté à l'intérieur du boîtier extérieur (10) au moyen d'au moins un élément amortisseur (27, 27') ayant une élasticité analogue à celle d'un ressort, de façon à amortir les vibrations, à l'intérieur du boîtier extérieur (10),
    - la bride (11) et les raccordements électrique sont montés fixes sur le boîtier extérieur (10) et
    - la plaque de résistance (40) et l'organe d'actionnement (30) sont maintenus sur le boîtier intérieur (20).
  2. Potentiomètre selon la revendication 1, caractérisé en ce que l'élément d'amortissement ayant une élasticité analogue à celle d'un ressort est un joint torique (27, 27')
  3. Potentiomètre selon la revendication 1, caractérisé en ce que l'élément amortisseur (27, 27') ayant l'élasticité d'un ressort est une bague dont la section transversale a la forme d'un carré avec des sommets d'angle (50) arrondis et présente des cotés (51) déformés pour être concaves.
  4. Potentiomètre selon l'une des revendications 1 à 3 caractérisé en ce que l'élément amortisseur (27, 27') ayant l'élasticité d'un ressort est en caoutchouc, en silicone ou une autre matière synthétique ayant l'élasticité d'un ressort.
  5. Potentiomètre selon l'une des revendications 1 à 4 caractérisé en ce que entre les boîtiers intérieurs et extérieurs (20, 10), sont prévus deux éléments amortisseurs (27, 27') ayant l'élasticité d'un ressort, disposés respectivement entre les deux arêtes frontales du boîtier intérieur (20) et les angles intérieurs opposés du boîtier extérieur (10).
  6. Potentiomètre selon la revendication 5 caractérisé en ce que le boîtier intérieur (20) présente, sur ses deux arêtes frontales, chaque fois un degré (28, 29) destiné à recevoir et dans lequel s'engage l'élément amortisseur (27, 27') ayant l'élasticité d'un ressort.
  7. Potentiomètre selon l'une des revendications 1 à 6, caractérisé en ce que les liaisons électriques entre les raccordements (prises plates 19) et la trajectoire fixée (piste résistante 41) ou le curseur (ressort de curseur 33) sont fabriqués au moyen de torons (44) brasés des deux côtés (45, 46) et en ce qu'une extrémité du toron (44) est serrée mécaniquement sur la plaque de résistance (40) et l'autre extrémité du toron (44) est serrée mécaniquement sur le boîtier extérieur (20) ou sur une prise femelle (18) reliée à celui-ci, au moyen de pinces (43, 47).
  8. Potentiomètre selon l'une des revendications 1 à 7, caractérisé en ce que l'organe d'actionnement (30) est relié, à la partie à accoupler de l'autre objet tout en réalisant l'amortissement des vibrations.
EP88106506A 1987-04-29 1988-04-22 Potentiomètre Expired - Lifetime EP0288930B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88106506T ATE88035T1 (de) 1987-04-29 1988-04-22 Potentiometer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3714348 1987-04-29
DE19873714348 DE3714348A1 (de) 1987-04-29 1987-04-29 Potentiometer

Publications (3)

Publication Number Publication Date
EP0288930A2 EP0288930A2 (fr) 1988-11-02
EP0288930A3 EP0288930A3 (en) 1990-01-10
EP0288930B1 true EP0288930B1 (fr) 1993-04-07

Family

ID=6326545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106506A Expired - Lifetime EP0288930B1 (fr) 1987-04-29 1988-04-22 Potentiomètre

Country Status (5)

Country Link
US (1) US4894638A (fr)
EP (1) EP0288930B1 (fr)
AT (1) ATE88035T1 (fr)
DE (2) DE3714348A1 (fr)
YU (1) YU40888A (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731328C1 (de) * 1987-09-17 1989-01-12 Ruf Kg Wilhelm Potentiometer und Verfahren zu dessen Herstellung
DE4024349A1 (de) * 1990-07-27 1992-01-30 Siemens Ag Schutzgehaeuse fuer einen elektronikbaustein mit anschlussleitung
JPH0678882B2 (ja) * 1990-11-14 1994-10-05 三菱電機株式会社 ポテンショメータ
EP0500223B1 (fr) * 1991-01-29 1995-08-23 CTS Corporation Circuit électronique avec un capteur de position
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
US5348267A (en) * 1992-09-18 1994-09-20 Eaton Corporation Apparatus for isolating a sensor
US6005473A (en) * 1995-01-20 1999-12-21 Alps Electric Co., Ltd. Rotary operation type variable resistor
JP3333810B2 (ja) * 1996-09-18 2002-10-15 アルプス電気株式会社 電気部品
JP3489652B2 (ja) * 1997-09-05 2004-01-26 アルプス電気株式会社 センサ
JP4272822B2 (ja) 2000-08-02 2009-06-03 アルプス電気株式会社 直線操作型電気部品
US6602099B1 (en) 2002-02-06 2003-08-05 Brunswick Corporation Vibration isolation support structure for a throttle body

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2836690A (en) * 1956-03-08 1958-05-27 Taylor Instrument Co Variable potential dividers
US3138777A (en) * 1961-09-21 1964-06-23 Hans H Wormser Potentiometers
US4053865A (en) * 1976-04-22 1977-10-11 Bourns, Inc. Linear motion coupling

Also Published As

Publication number Publication date
YU40888A (en) 1990-12-31
EP0288930A2 (fr) 1988-11-02
ATE88035T1 (de) 1993-04-15
DE3714348A1 (de) 1988-11-17
EP0288930A3 (en) 1990-01-10
US4894638A (en) 1990-01-16
DE3879998D1 (en) 1993-05-13
DE3714348C2 (fr) 1990-10-25

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