WO2002082031A2 - Einrichtung zum ermitteln des drehmoments an einer rotierbaren metallischen welle - Google Patents
Einrichtung zum ermitteln des drehmoments an einer rotierbaren metallischen welle Download PDFInfo
- Publication number
- WO2002082031A2 WO2002082031A2 PCT/DE2002/001305 DE0201305W WO02082031A2 WO 2002082031 A2 WO2002082031 A2 WO 2002082031A2 DE 0201305 W DE0201305 W DE 0201305W WO 02082031 A2 WO02082031 A2 WO 02082031A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- sensor
- eddy current
- torque
- coil
- Prior art date
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
- G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
- G01L3/105—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving inductive means
Definitions
- the invention relates to a device for determining the torque on a rotatable metallic shaft by means of a stationary sensor, which detects changes in the shaft that are dependent on torsional stress without contact.
- Such a device is e.g. become known from EP 0208892, in which two nested slotted bushings are anchored to both sides of a torsion section of the shaft. Due to the torsion of the shaft, the bushings are rotated against each other and the slots in the bushings are shifted accordingly. A stationary coil encircling the sockets produces eddy currents in the sockets, the coupling strength of which changes with the displacement of the slots and is evaluated accordingly.
- Such a device requires considerable structural interventions on the shaft, which are associated with corresponding manufacturing costs, in particular when the two bushings have to be adjusted to a precisely defined angular position relative to one another.
- the invention has for its object to reduce the design effort.
- the greatest deformation of the material in the outer skin of the shaft changes the conductivity of the cladding layer.
- the eddy currents have a low penetration depth, so that they capture the most affected material layer.
- the coupling strength changes analogously to the electrical conductivity or the impedance of the outer layer of the shaft and can be evaluated by suitable electronics, with which the temperature compensation is also carried out.
- Mat 'erialde can be detected before rupture.
- the electrical conductivity in the unloaded state must be measured or the maximum sensor signal values must be monitored and evaluated separately.
- the sensor can advantageously be mounted at the most heavily loaded point.
- the sensor can be arranged at a location on the shaft receiving housing where there is sufficient space anyway. But it is also e.g. Casting technology possible without great effort to create a suitable installation space.
- the wave section required for the detection can be shortened to the effective width of the sensor. The wave need not be changed for this purpose.
- the arrangement according to claim 2 induces the current vortices substantially perpendicular to the coil axis in the outer layer of the shaft, which increases the sensitivity of the device.
- the further development according to claim 3 further increases the sensitivity of the device.
- the layer according to claim 4 can be applied, for example, galvanically or by vapor deposition with little effort, the design of the shaft being hardly changed.
- the sensitivity of the device is particularly increased by the suitable conductivity of this outer layer.
- the sensitivity of the material layer can be further increased by the pattern according to claim 5.
- patterns of different thickness, shape or density can be selected in order to optimize the sensor properties.
- the marking according to claim 6 is formed as a pulse when the shaft rotates, e.g. can be used for speed measurement without incurring any significant additional effort.
- a second, asymmetrically arranged marking also makes it possible to recognize the direction of rotation of the shaft.
- the different sensitivity of several sensor heads used according to claim 7 can be determined by different operating parameters such as by different distances to the shaft or different operating frequencies. This makes it possible to dispense with precise positioning of the sensor heads.
- the development according to claim 8 summarizes all functional parts of the device in a completely prefabricated and correspondingly easy to install module that also contains the power supply of the device.
- the temperature sensor according to claim 9 makes it possible to compensate for temperature-related changes in the conductivity of the shaft material.
- the use of the sensor according to claim 10 enables the detection of essential functional values of an engine, one Transmission, the drive shafts, the wheel axles, and the steering.
- the figure shown shows a schematic perspective view of a shaft 1, (in particular the drive shaft of a transmission which can be coupled to a crankshaft of an engine in a motor vehicle.
- a shaft 1 in particular the drive shaft of a transmission which can be coupled to a crankshaft of an engine in a motor vehicle.
- two diametrically arranged sensor heads 2 are shown at different distances from the shaft 1 form a common eddy current sensor 4.
- the sensor heads 2 are directed approximately radially towards the outer skin of the shaft 1 with the central axis of their electrical coil 1.
- a high-frequency alternating electromagnetic field generated by the magnetic coil induces eddy currents in the outer skin of the shaft 1.
- the shaft 1 is under a torsional stress that is particularly pronounced in the outer skin of the shaft 1.
- the electrical conductivity of the outer skin changes due to structural shifts, particularly in the outer skin.
- the coupling strength of the electromagnetic waves changes accordingly, which leads to a change e.g. of the feed current of the electrical coil.
- An evaluation device not shown, detects these changes and can thus determine the torque applied to the shaft.
- the shaft is coated with an applied material layer 3, the conductivity of which is lower than that of the shaft. This layer leads to stronger changes in the coupling strength of the electromagnetic sensor waves, which increases the sensitivity of the device.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02727295A EP1377805A2 (de) | 2001-04-09 | 2002-04-09 | Einrichtung zum ermitteln des drehmomentes an einer rotierbaren metalischen welle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001117724 DE10117724C2 (de) | 2001-04-09 | 2001-04-09 | Einrichtung zum Ermitteln des Drehmoments an einer rotierbaren metallischen Welle |
DE10117724.0 | 2001-04-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002082031A2 true WO2002082031A2 (de) | 2002-10-17 |
WO2002082031A3 WO2002082031A3 (de) | 2002-11-21 |
Family
ID=7680988
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/001305 WO2002082031A2 (de) | 2001-04-09 | 2002-04-09 | Einrichtung zum ermitteln des drehmoments an einer rotierbaren metallischen welle |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1377805A2 (de) |
DE (1) | DE10117724C2 (de) |
WO (1) | WO2002082031A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7478567B2 (en) | 2002-05-15 | 2009-01-20 | The Timken Company | Eddy current sensor assembly for shaft torque measurement |
EP1508022B1 (de) | 2002-05-29 | 2014-02-12 | The Timken Company | In einem lager intergrierter drehmomentsensor |
DE102007028642A1 (de) * | 2007-06-21 | 2008-12-24 | Siemens Ag | Festkörperaktorischer Antrieb |
JP6293036B2 (ja) | 2014-09-11 | 2018-03-14 | メソッド・エレクトロニクス・マルタ・リミテッド | 磁気センサのための距離測定方法及びセンサ |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4135391A (en) * | 1977-11-22 | 1979-01-23 | Asea Aktiebolag | Torque transducer |
DE2939566A1 (de) * | 1979-09-29 | 1981-04-09 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Magnetostriktives messverfahren, insbesondere zur drehmomentmessung an wellen |
JPS6141936A (ja) * | 1984-08-02 | 1986-02-28 | Matsushita Electric Ind Co Ltd | トルクセンサ |
US5321985A (en) * | 1990-02-07 | 1994-06-21 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Magnetostriction type torque sensor |
US5412999A (en) * | 1993-02-26 | 1995-05-09 | Sensorteck L.P. | Position sensing with magnetostrictive stress sensor |
EP0676627A1 (de) * | 1992-12-25 | 1995-10-11 | Omron Corporation | Magnetostriktiver dehnungssensor und dessen anwendung |
US5522269A (en) * | 1993-05-07 | 1996-06-04 | Unisia Jecs Corporation | Apparatus and method for transducing torque applied to a magnetostrictive shaft while minimizing temperature induced variations |
US5902934A (en) * | 1990-12-10 | 1999-05-11 | Sensortech, L.P. | Phase magnitude signal detector |
WO2000058704A1 (en) * | 1999-03-26 | 2000-10-05 | Fast Technology Ag. | Torque and speed sensor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3206008C1 (de) * | 1982-02-19 | 1983-08-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Verfahre zur beruehrungslosen Messung statischer und dynamischer Drehmomente |
DE3437379A1 (de) * | 1983-10-12 | 1985-04-25 | Bently Nevada Corp., Minden, Nev. | Vorrichtung zum messen der auf eine welle ausgeuebten dreh- oder biegekraft |
DE3437329A1 (de) * | 1984-10-11 | 1986-04-24 | Hoechst Ag, 6230 Frankfurt | Vorrichtung zum behandeln von druckplatten mit einer fluessigkeit |
US5600239A (en) * | 1995-06-16 | 1997-02-04 | The United States Of America As Represented By The Secretary Of The Navy | Strain sensing system including a magnetostrictive material having a piezomagnetic property selected for maximizing electrical impedance to current applied to a predetermined skin depth |
-
2001
- 2001-04-09 DE DE2001117724 patent/DE10117724C2/de not_active Expired - Fee Related
-
2002
- 2002-04-09 WO PCT/DE2002/001305 patent/WO2002082031A2/de not_active Application Discontinuation
- 2002-04-09 EP EP02727295A patent/EP1377805A2/de not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4135391A (en) * | 1977-11-22 | 1979-01-23 | Asea Aktiebolag | Torque transducer |
DE2939566A1 (de) * | 1979-09-29 | 1981-04-09 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Magnetostriktives messverfahren, insbesondere zur drehmomentmessung an wellen |
JPS6141936A (ja) * | 1984-08-02 | 1986-02-28 | Matsushita Electric Ind Co Ltd | トルクセンサ |
US5321985A (en) * | 1990-02-07 | 1994-06-21 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Magnetostriction type torque sensor |
US5902934A (en) * | 1990-12-10 | 1999-05-11 | Sensortech, L.P. | Phase magnitude signal detector |
EP0676627A1 (de) * | 1992-12-25 | 1995-10-11 | Omron Corporation | Magnetostriktiver dehnungssensor und dessen anwendung |
US5412999A (en) * | 1993-02-26 | 1995-05-09 | Sensorteck L.P. | Position sensing with magnetostrictive stress sensor |
US5522269A (en) * | 1993-05-07 | 1996-06-04 | Unisia Jecs Corporation | Apparatus and method for transducing torque applied to a magnetostrictive shaft while minimizing temperature induced variations |
WO2000058704A1 (en) * | 1999-03-26 | 2000-10-05 | Fast Technology Ag. | Torque and speed sensor |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 198 (P-476), 11. Juli 1986 (1986-07-11) & JP 61 041936 A (MATSUSHITA ELECTRIC IND CO LTD), 28. Februar 1986 (1986-02-28) * |
Also Published As
Publication number | Publication date |
---|---|
DE10117724A1 (de) | 2002-10-17 |
EP1377805A2 (de) | 2004-01-07 |
WO2002082031A3 (de) | 2002-11-21 |
DE10117724C2 (de) | 2003-03-27 |
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