WO2009059774A2 - Dispositif pour mesurer des paramètres - Google Patents

Dispositif pour mesurer des paramètres Download PDF

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Publication number
WO2009059774A2
WO2009059774A2 PCT/EP2008/009386 EP2008009386W WO2009059774A2 WO 2009059774 A2 WO2009059774 A2 WO 2009059774A2 EP 2008009386 W EP2008009386 W EP 2008009386W WO 2009059774 A2 WO2009059774 A2 WO 2009059774A2
Authority
WO
WIPO (PCT)
Prior art keywords
structural element
sensor
plastic
sensor structure
integrated
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.)
Ceased
Application number
PCT/EP2008/009386
Other languages
German (de)
English (en)
Other versions
WO2009059774A3 (fr
Inventor
Miroslaw Wrobel
Heiko Haag
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.)
Wittenstein SE
Original Assignee
Wittenstein SE
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 Wittenstein SE filed Critical Wittenstein SE
Publication of WO2009059774A2 publication Critical patent/WO2009059774A2/fr
Publication of WO2009059774A3 publication Critical patent/WO2009059774A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/108—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving resistance strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction

Definitions

  • the present invention relates to a device for measuring parameters, in particular strains, temperatures, concentration and composition of gases, magnetic or electric fields with a structural element.
  • sensor structures are glued to components in a conventional device, via which forces and torques can be passed, which are transmitted from, for example, mechanical components, such as motors and / or gears, on any downforce. Between the electric motor and / or gear and the output then the device is used for measuring strains to od corresponding torques, tilting moments, torsional forces, shear forces. Like. to investigate.
  • a disadvantage of conventional devices is that they are expensive to produce and the sensor elements, in particular strain gauges are glued to their structures and are not very durable connected to the structures. These are also subject to great wear and achieve insufficient measurement results, especially at high temperature fluctuations. Furthermore, conventional manufacturing is very process and assembly intensive and therefore undesirably time consuming.
  • the present invention is therefore an object of the invention to provide a device of the type mentioned, which eliminates the disadvantages mentioned and with which in a simple and inexpensive way an o.g. Device can be produced, which determines very fast and accurate, especially temperature-dependent arbitrary physical sizes, parameters such as strains, in particular torsional, tilting moments, bending moments and shear forces and is also very durable.
  • MID methods such as e.g. Hot embossing, light activation, two- or multi-component processes, or other chemical processes, the sensor structure embedded in the plastic surface and the structural element, e.g. Housing or flange, thus even to the sensor element.
  • the invention is not limited to these methods.
  • the invention is based on the idea, the use of conductive, eg metallic structures, which were previously used only as interconnects in the art and thus should have the lowest possible resistance, should now be reversed.
  • conductive structures with as high a resistance as possible, one can determine, for example similar to DMS stripes, changes such as strain through the change in impedance and thus use the plastic structure part with the embedded measuring structures as a sensor.
  • the structural element can thus be used as an inductive and / or capacitive element.
  • LCP Liquid Cristal Polymer
  • MID technology a wide variety of materials can be used.
  • high temperature and engineering thermoplastics provided with surface conductive structures of tin, lead, gold, nickel or other conductive materials can be used.
  • substrate materials materials with substrate materials are used as the carrier.
  • substrate materials polypropylene, acrylonitrile-butadiene-styrene, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyphenylene sulfide, polysulfone, polyethersulfone, polyetherimide and liquid crystal polymer may be used.
  • the most important material parameters to be considered are taken into account in the selection of a substrate material, such as processing and service temperature, flame retardancy, mechanical and electrical properties, sprayability and metallization and their costs.
  • a material selection is application specific.
  • three-component processes can also be used.
  • piezoelectric properties can be caused.
  • the carrier made of plastic is first activated and metallized by laser, for example, and comb contacts are produced.
  • the support surface is coated and polarized, for example with PVDF (polyvinylidene fluoride), a transparent, semi-crystalline, thermoplastic Floureckstoff.
  • PVDF polyvinylidene fluoride
  • a protective layer With the help of this structure can z. B. surface waves are detected.
  • electrical signals are converted by means of electrodes into sound waves which propagate on the surface.
  • z For example, the gas concentration at the sensor, the reaction of the piezoelectric material with the gas changes the wavelength of the surface between the contacts od. Electrode and these waves are inert. This can be detected after the reconversion into an electrical signal and thus shows z.
  • such structures can be used as strain or pressure sensors.
  • a magnetic field could be detected with a ferromagnetically doped carrier plastic, in which, for example
  • Ferrop be mixed with the plastic granules.
  • the structural element can be provided with a reinforcing element, in particular a metal ring. be reinforced, which is reshaped in about the shape of the structural element.
  • the structural element can be produced in an annular manner but also linearly or in any shapes, curve shapes, in order to precisely determine any parameters, such as expansions as torques, tilting moments, transverse forces, torsional forces, compressive and tensile forces.
  • plastic strain gauges but also, for example, impedance sensors, surface wave sensors can be used as sensor elements to measure or determine, for example, other measured variables, such as a change in an electric or magnetic field or presence of certain gases or oils.
  • Figure 1 is a schematically illustrated perspective view of an inventive device for measuring strains
  • Figure 2 is a schematic plan view of another embodiment of a device for measuring strains with a linearly formed structural element.
  • an apparatus Ri according to the invention in particular a torque sensor, has a structural element 1, which in the present exemplary embodiment is designed as an annular flange 2 which is subdivided into individual segments 3 which are connected to one another by strain-measuring structures 4.
  • the strain gauges 4 are formed as webs, which form an annular or polygonal shape, as shown in the present embodiment form.
  • a segment 3 and a strain gauge structure 4 is always alternately provided and forms the circular ring-shaped structural element.
  • through-holes 5 or threaded bores 6 can optionally be provided alternately for a connection for the introduction and a connection for the discharge of the moments.
  • the strain gauge 4 is formed tapered.
  • corresponding sensor structures 9 are provided in each expansion structure 4 between the segments 3 in the region of its inside 7 and / or outside 8.
  • the individual sensor structures 9 can be used, for example, as transducers, strain gauges, strain gauges or the like. be educated. It has proved particularly advantageous in the present invention to produce the structural element 1 with segments 3 and strain-measuring structures 4 and sensor structures 9 in a manufacturing process in which the sensor structures 9 are preferably embedded directly in the measuring structures.
  • the structural element 1 as a rigid body made of plastic, wherein in its strain gauges 4, the corresponding sensor structures 9 are firmly integrated and embedded.
  • the sensor structures 9 in the expansion structure 4th be integrated and integrated much more intensively and firmly.
  • the structural element 1, in particular the strain-measuring structure 4 melts. with the sensor structure S, which integrally forms a unit there.
  • the accuracy and the speed of the measurement result of the present inventive device Ri is significantly improved because not as conventional, the sensor elements are glued as DMS strips on an outer ring.
  • Area of the inside 7 and / or outside 8 can not only protect the sensor structure 9, but it can also all torsional, bending and tilting moments very accurately and very quickly, temperature and environmentally independent, durable and permanently determined.
  • a reinforcing element 13 made of metal with upper side 11 and lower side 12 can preferably be fixedly bonded, glued or firmly integrated directly in the region of an upper side 11 or lower side 12 that higher torsional, tilting and bending moments can be transmitted.
  • the reinforcing element 13 is substantially adapted to the structure and shape of the sturkuriatas 1 and also has the corresponding aligned through-holes 5, threaded holes 6 according to the structural element 1.
  • the structural element 1 with measuring structure 4 and integrated sensor structures 9 can then be incorporated into a plastic housing 14, in particular cast in an annular manner, which is preferably formed from an even softer material than the structural element 1.
  • a device R 2 which corresponds to the aforementioned type.
  • the structural element 1 is a linear type, as indicated by the top view. This may also be formed of a plurality of segments 3 with linearly arranged strain measuring structures 4 therebetween.
  • the segments 3 in the manner described above also have through holes 5 and threaded holes 6, for example, to determine bending, torsional or tilting moments exactly.
  • a linear shape may also be a slightly curved, a polygonal and possibly partially open form to understand.
  • the individual adjacent segments 3 can also be in preferably blunt angles and radii with between them arranged measuring structure 4 to be aligned.
  • the invention is not limited thereto.
  • the structural element 1 is made entirely of plastic and in the region of the sides 7, 8 or the cross-sectionally tapered strain gauge structure 4
  • Plastic material of the structural element 1 form a unit.
  • strain gauge 4 need not be tapered.
  • the respective segments 3 may also have through holes 5 and / or threaded bores 6 in order to alternately ensure introduction and discharge of moments of possibly different components or the corresponding elements, moments,
  • the structural element 1 can be completely cast or cast into a plastic housing 14, except for the through bores 5 and / or threaded bores 6, which is produced by a softer plastic material than the structural element 1.
  • the structural element 1, consisting of segments 3, strain-measuring structure 4 with embedded sensor structures 9, is preferably encapsulated by a very wide variety of processes in an operation, as an injection molding process.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

L'invention concerne un dispositif pour mesurer des paramètres, en particulier des contraintes, des températures, la concentration et la composition de gaz, des champs magnétiques ou électriques, ce dispositif comprenant un élément de structure (1). Ledit élément de structure (1) doit être composé essentiellement de plastique et se présenter au moins partiellement sous la forme d'une structure de détection (9).
PCT/EP2008/009386 2007-11-07 2008-11-07 Dispositif pour mesurer des paramètres Ceased WO2009059774A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007053552.1A DE102007053552B4 (de) 2007-11-07 2007-11-07 Vorrichtung zum Messen von Kräften oder Momenten
DE102007053552.1 2007-11-07

Publications (2)

Publication Number Publication Date
WO2009059774A2 true WO2009059774A2 (fr) 2009-05-14
WO2009059774A3 WO2009059774A3 (fr) 2009-08-13

Family

ID=40470076

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/009386 Ceased WO2009059774A2 (fr) 2007-11-07 2008-11-07 Dispositif pour mesurer des paramètres

Country Status (2)

Country Link
DE (1) DE102007053552B4 (fr)
WO (1) WO2009059774A2 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956930A (en) * 1974-09-23 1976-05-18 Gse, Inc. Driveline torque and/or thrust sensor
SE8904082D0 (sv) * 1989-12-04 1989-12-04 Skf Nova Ab Hjullagerenhet
JP3131642B2 (ja) * 1994-09-14 2001-02-05 日本電子工業株式会社 応力複合化センサ及びこれを用いた構造体の応力測定装置
DE20115299U1 (de) * 2001-09-11 2001-12-20 Oechsler AG, 91522 Ansbach Biegemeßelement und damit erstellter Drehwinkelgeber
DE102007023537A1 (de) * 2007-05-18 2008-11-20 Wittenstein Ag Vorrichtung zum Messen von Dehnungen

Also Published As

Publication number Publication date
WO2009059774A3 (fr) 2009-08-13
DE102007053552B4 (de) 2017-02-09
DE102007053552A1 (de) 2009-05-20

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