Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
  • G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
  • G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track
  • G01D5/1655—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track more than one point of contact or actuation on one or more tracks
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01C—RESISTORS
  • H01C10/00—Adjustable resistors
  • H01C10/30—Adjustable resistors the contact sliding along resistive element

Definitions

• the invention relates to a potentiometer of the type defined in the preamble of claim 1.
• the grinder In a known potentiometer of this type (DE 196 24 780 A1), which is used as a position sensor for detecting the angular position of a throttle valve in the intake pipe of an internal combustion engine, the grinder has a carrier and two resilient grinding plates attached to it, each carrying a contact brush at the end which, in turn, make electrical contact with a resistance mat shark. Of the two concentrically arranged sliding tracks, one is connected at the end to two connecting terminals for applying a potentiometer voltage and the other
• Grinding path is connected at one end to a measuring terminal to which a tapped from s' grinders potentiometer voltage is removable as a measure of the relative position of the grinder and the grinding path. Since the sliding track is fixed in a housing of a throttle valve connector and the grinder is connected in a rotationally fixed manner to the adjusting shaft for the throttle valve, the is on the Measuring terminal removed voltage a measure of the rotational position of the throttle valve.
• the potentiometer according to the invention with the features of claim 1 has the advantage that the inventive construction of the contact element electrically contacting the sliding track from an electrically conductive core and a noble metal jacket, which usually reduces a high proportion of the noble metal used for electrical contacting, which is a
• the ring surface of the noble metal jacket ensures that the noble metal that ensures good contact still lies on the grinding track.
• the contact element is designed as a grinding wire which is fastened at its end facing away from the contact surface on a grinder arm of the grinder. This has the advantage that due to the Ede existing over the length of the grinding wire . lmetallmantei a reliable contact with low contact resistance can also be produced on the carrier side.
• the grinding wire is angled so that the longer leg is attached to the carrier and the shorter leg has the contact surface.
• This has the advantage that a contact force exerted on the contact surface by the wire itself is applied by the long leg of the angled contact wire, which ensures the electrical contact with the contact track.
• the core of the grinding wire is made of spring wire, so that a resilient bias can be impressed on the grinding wire.
• FIG. 1 shows a potentiometer in use as a position sensor or angle encoder for detecting the angle of rotation position of a rotating component
• Fig. 2 excerpts a bottom view of the grinder of the
• Fig. 4 shows a section of a grinding wire of the grinder of the
• the potentiometer shown in the drawing serves as a position sensor for sensing the rotary setting of a rotating component.
• a position sensor In motor vehicles, such a position sensor is used to detect the swivel angle of a throttle valve which is arranged in an intake duct of the internal combustion engine and which represents the rotating component.
• a housing 10 accommodating the potentiometer is fastened to the so-called throttle valve connector of the intake duct, and the drive shaft for the throttle valve is coupled to the potentiometer.
• the potentiometer has two slideways 11, 12, at least one of which is made of electrical resistance material, and a slider 13, which is rotatable relative to the slideways 11, 12.
• the two grinding tracks 11, 12 are designed as arc sections which are applied concentrically to one another on a base plate 14, which in turn is firmly accommodated in the housing 10.
• the grinder 13 sits on a rotary shaft 15 which is mounted in the housing 10 and, in the case of using the potentiometer as a position sensor for detecting the pivoting angle of a throttle valve, is connected in a rotationally fixed manner to the actuating shaft of the throttle valve or is formed by the actuating shaft of the throttle valve.
• the front and rear ends of the sliding track 11 are each connected to a connecting terminal 16, 17 via conductor tracks 111, 112, while the front end of the sliding track 12 is only connected to a connecting terminal 18 via a conductive path 121.
• the connecting terminals 16 - 18 are guided to plug pins, not shown here, in a plug housing 26.
• the connector pins are assigned such that a potentiometer voltage is applied to the connecting terminals 16 and 17 and the voltage tapped at the potentiometer is taken from the connecting terminal 18, which voltage is a measure of the rotational position of the grinder 13 or of the component connected to it in a rotationally fixed manner, for example the Throttle valve, is.
• the grinder 13 has a plurality of contact elements 19 which rest on the sliding tracks 11, 12 with a contact surface 20 (FIG. 4).
• the plurality of contact elements 19 is divided into two groups 191 and 192, of which the group 191 of the contact elements 19 with their contact surfaces 20 on the sliding track 11 and the group 192 of the contact elements 19 with their
• each contact element 19 has an electrically conductive core 21 made of an inexpensive filler of a conductive material, at least in the area of its contact surface 20, that is to say at its end resting on the sliding track 11 or 12 Graphite, carbon fiber and dgL, and a noble metal jacket 22 surrounding the core 21. Core 21 and noble metal jacket 22 are flush on the end face, so that the annular end face of the noble metal jacket 22 forms the contact surface 20 together with the end face of the core 21.
• each contact element 19 is designed as a long grinding wire 23, which at its end remote from the contact surface 20 is supported on an electrically conductive carrier plate 24, e.g. a support plate is attached.
• the attachment is preferably carried out by welding the grinding wire end onto the carrier plate 24.
• the carrier plate 24 is either attached to the underside of a plastic grinding arm 25 or itself forms the grinding arm 25, which is then connected in a rotationally fixed manner to the rotary shaft 15 via a plastic bushing.
• each grinding wire 23 is angled and has a long leg 231, which is fastened at the end to the carrier plate 24, and a short leg 232 protruding therefrom at right angles, which carries the contact surface 20 at its end.
• the core 21 of the grinding wire 23 is preferably made of spring steel, which is enclosed by the noble metal jacket 22 over the entire length of the grinding wire.
• the desired contact pressure of the contact surface 20 on the sliding tracks 11, 12 can be set by a suitable prestressing of the now resilient grinding wire.
• Each of the multiplicity of grinding wires 23 which — as described — contact the sliding track 11 in group 191 and contact the sliding track 12 in group 192 have an outer diameter of approximately 0.1 mm.
• the invention is not restricted to the exemplary embodiment described above.
• a single slideway to which a potentiometer voltage is applied is sufficient.
• the measuring voltage is then taken from the grinder 13, which is carried out with a corresponding electrical connection.
• the relative movement between Grinder 13 and grinding tracks 11, 12 are not a rotary movement, but can be designed as a linear displacement.
• the base plate carrying the grinding tracks 11, 12 can also be rotated or displaced linearly, the grinder 13 then being spatially fixed.

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• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7697572

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Citations (3)

Family Cites Families (18)

• 2001
  • 2001-09-04 DE DE10143164.3A patent/DE10143164B4/de not_active Expired - Fee Related
• 2002
  • 2002-06-20 US US10/399,661 patent/US6838973B2/en not_active Expired - Fee Related
  • 2002-06-20 JP JP2003531483A patent/JP2005504302A/ja active Pending
  • 2002-06-20 WO PCT/DE2002/002253 patent/WO2003028046A1/de active Application Filing
  • 2002-06-20 EP EP02747230A patent/EP1428230A1/de not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

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