WO2007006595A1 - Dispositif pour mesurer le couple au niveau de l'arbre de transmission d'un vehicule automobile - Google Patents

Dispositif pour mesurer le couple au niveau de l'arbre de transmission d'un vehicule automobile Download PDF

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Publication number
WO2007006595A1
WO2007006595A1 PCT/EP2006/062166 EP2006062166W WO2007006595A1 WO 2007006595 A1 WO2007006595 A1 WO 2007006595A1 EP 2006062166 W EP2006062166 W EP 2006062166W WO 2007006595 A1 WO2007006595 A1 WO 2007006595A1
Authority
WO
WIPO (PCT)
Prior art keywords
torque
hollow shaft
magnetic field
shaft
electronics housing
Prior art date
Application number
PCT/EP2006/062166
Other languages
German (de)
English (en)
Inventor
Leopold Hellinger
Gerhard Neumann
Jeffry Steppe
Ralf David Woods
Original Assignee
SIEMENS AKTIENGESELLSCHAFT öSTERREICH
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 SIEMENS AKTIENGESELLSCHAFT öSTERREICH filed Critical SIEMENS AKTIENGESELLSCHAFT öSTERREICH
Publication of WO2007006595A1 publication Critical patent/WO2007006595A1/fr

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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
    • G01L3/102—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 magnetostrictive means
    • 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
    • G01L3/102—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 magnetostrictive means
    • G01L3/103—Details about the magnetic material used

Definitions

  • the invention relates to a device for measuring a torque which is transmitted by a rotatably mounted in a transmission housing of a motor vehicle shaft, wherein the shaft is formed at least in a torque-conducting portion as a hollow shaft and wherein a housing-side opening of the hollow shaft through a recess on the transmission housing from the outside is accessible.
  • sensors For measuring forces and torques, sensors are known which exploit the effect of the inverse magnetostriction.
  • Magnetostriction is an effect that describes the change in geometric dimensions of a body when it is under the influence of a magnetic field.
  • an already premagnetized body responds to mechanical deformation with a change in its magnetization.
  • This effect is referred to as inverse magnetostriction or as Villari effect and also used in sensors that detect contactless transmitted by a shaft torque.
  • a sensor is described in DE 3407917 A1.
  • the magnetic material is first applied to the surface of a non-magnetic carrier sleeve.
  • the carrier sleeve is then pushed onto the transmission shaft of a motor vehicle and connected to this force-conducting.
  • the transmission shaft is subjected to a torque
  • the magnetic field radiated from the magnetic material into the outer space changes.
  • the change of the magnetic field detects a magnetic field detector mounted on the outer peripheral side.
  • the measurement of the torque conducted by a four-wheel drive transfer case to the front and rear axles, respectively, is crucial for controlling traction, vehicle stability, braking performance and fuel economy.
  • a measuring device in a motor vehicle exposed to magnetic and electromagnetic interference fields and harsh operating conditions.
  • Measuring device is easily accessible and easy to maintain. If a change is necessary in the event of a malfunction, this should be done without the removal of a Transmission shaft be possible. Furthermore, electromagnetic interference fields, which can disturb the weak measuring signals of a magnetic torque sensor, act on a torque measuring system in a motor vehicle.
  • Measuring device arranged in a hollow shaft.
  • an area with a magnetization is formed on an inner ring surface.
  • a magnetic field detector which is arranged on a carrier part at a distance from an annular gap of this magnetized area, detects the torque-dependent magnetic field.
  • the carrier part is mounted in an inserted state with a projecting into the cavity portion by a support bearing. With another end, the support member is led out through a recess in the transmission housing and on a
  • Gear housing part set outside.
  • the arrangement of the sensor inside the hollow shaft is the measuring device well shielded against magnetic interference fields.
  • the measuring device is easily accessible from the outside. If, in the event of a fault, the detector or the evaluation circuit has to be serviced or replaced, this does not require removal of the gear shaft.
  • the support member additionally causes heat removal from the interior of the hollow shaft, so that the magnetic field detector is comparatively exposed to a low operating temperature.
  • the magnetization is formed directly in the material of the hollow shaft, or in other words, the magnetized region and the hollow shaft are made of a material and are designed to merge into one another.
  • the magnetized region and the hollow shaft are made of a material and are designed to merge into one another.
  • Outer peripheral surfaces of waves are mounted on carrier sleeves, the production is easier and possible at a lower cost.
  • a preferred embodiment of the invention is therefore characterized in that the hollow shaft is mounted in a, with respect to the inner ring surface radially outwardly opposite outer peripheral surface by a bearing in a gear housing part.
  • the carrier part on which the magnetic field detector is arranged is made of a non-magnetic material.
  • the outer ring or the inner ring of the support bearing, with which the support member is supported in the Holwelle, insulated by a heat insulating bushing is advantageous.
  • the carrier part has a bore extending in the axial direction.
  • This bore forms a cable duct for electrical lines which connects the magnetic field detector with an evaluation circuit arranged outside the transmission on a printed circuit board. In this way, electrical and magnetic interference are kept away both from the magnetic field detector and from the connecting lines to the transmitter.
  • an electronics housing which has a lower shell, which is made of a thermally insulating material.
  • the electronics housing lower shell and the printed circuit board are each provided with a recess. In a mounted state these recesses align with the recess in the
  • the support member can be passed through these recesses and out.
  • the support member may then be connected to a cover member formed as a heat sink, whereby to some extent operating heat can be derived from the interior of the hollow shaft to the outside.
  • a material from the group 40NiCrMo6, 14NiCrMol34, 20MnCrS5, 41Cr4 is used for the hollow shaft and thus also for the magnetized area.
  • the magnetic field detector includes a flux gate magnetometer module designed as an integrated circuit.
  • Figure 1 is a sectional view of a drive shaft in a transfer case of a motor vehicle
  • FIG. 2 shows a detail drawing in the region X of the representation according to FIG. 1.
  • FIG. 1 shows a device 27 for the contactless determination of a torque, which is transmitted by a shaft designed as a hollow shaft 1 in a transfer case 6, 7 of a motor vehicle.
  • Radial shaft sealing ring 22 seal the hollow shaft 1 in the transfer case 6,7 relative to the outer space.
  • the supply of torque takes place inside the housing 6,7 by means of a chain 11.
  • the chain 11 is connected to a on the hollow shaft 1 on the outer peripheral side gear 12 is engaged.
  • Umschlingungstrieb 11,12 the torque of the hollow shaft 1 is supplied.
  • the hollow shaft 1 passes the torque to an output 13.
  • the output 13 is led out in Figure 1 on the housing part 6 on the left. From this output 13, the drive power of the engine reaches the wheels of the motor vehicle.
  • the hollow shaft 1 is on the one hand in a driven side
  • Bearing 4 mounted on a front gear housing part 6.
  • the other end of the hollow shaft 1 is rotatably supported by a drive side arranged bearing 5 in a rear gear housing part 7.
  • the rear gear housing part 7 has a recess 25. Die
  • Hollow shaft 1 has a hollow interior 19 extending in the direction of the axis of rotation 23.
  • a support member 2 can be seen, which is inserted during assembly from the outside through the right in Figure 1 opening 29 of the hollow shaft 1 and the recess 25 in the housing part 7.
  • the hollow shaft 1 In the retracted state, the hollow shaft 1 is crashed left by acting as a support bearing deep groove ball bearing 3 in the hollow shaft 1 and simultaneously rotatably supported.
  • a right end piece of the support part 2 extends through the recess 25 and is connected on the housing side by means of screws 21 with a cover part 15.
  • the cover part 15 covers the recess 25 and in turn is bolted by fastening screws 24 to the rear gear housing part 7.
  • the actual torque sensor is highlighted in Figure 1 by a circle designated by X.
  • This detail X can be seen in an enlarged view in FIG. It essentially consists of a magnetized area 8 the Holwelleninnenseite and a magnetic field detector device 9.
  • the magnetized region 8 is radially opposite the bearing 4.
  • the magnetized region 8 radiates a magnetic field into the cavity 19. The field lines of this magnetic field close over the
  • the lying between the gear 12 and output 13 part of the hollow shaft 1 is thus claimed to torsion.
  • This twist is transmitted to the magnetized region 8.
  • the consequence of this mechanical stress is a change in the orientation of the magnetic field lines in the region of the magnetization 8 and thus a change in the magnetic field quantities in the interior space 19.
  • This change in the magnetic field quantities is detected by the magnetic field detector 9.
  • the magnetic field detector 9 is fastened by a radial gap of the magnetized region 8 on the housing-fixed carrier part 2 and contains a designed as an integrated circuit flux gate magnetometer sensor module.
  • the transmitter 28 is located outside the gear housing 6, 7.
  • the components of this evaluation circuit 28 are arranged on a printed circuit board 16.
  • the circuit board 16 is located in an electronics housing 14,15, which is fixed to the right in Figure 1 gear housing part 7.
  • a bore 20 is formed ( Figure 1). This bore 20 extends in the axial direction of the support member 2 and acts as a cable channel for the lines 17 between the detector 9 and circuit 28. Since the hollow shaft 1 is made of a ferromagnetic material, externally applied magnetic fields from the magnetic field detector 9 and the lines 17 are well shielded.
  • the torque can also be determined with sufficient accuracy from a comparatively weaker measuring signal, so that the magnetization 8 can be formed directly in the tempering steel of the hollow shaft 1.
  • the structural arrangement of the sensor arrangement 8,9 in the inner space 19 of a hollow shaft 1 utilizes the trend of modern transmission designs, in which the formation of transmission shafts as hollow shafts for reasons of weight saving is increasingly widespread.
  • the measuring device according to the invention requires only a small installation volume and there are no significant changes to the transmission design required.
  • the device according to the invention Since the mechanical moment is detected without contact, that is without mechanical contacts, the device according to the invention withstands the harsh operating conditions in a motor vehicle. At the same time, the device is easy to maintain. In case of disturbances of the magnetic field detector 9 and / or a break of the connecting lines 17, the maintenance can be done simply by the fixing screws 24 are released and the support member 2 together with sensor components 9 from the cavity 19 in Figure 1 in the direction from left to right out to be pulled. The electronic components on the Printed circuit board 16 are accessible by removing the lid 14 in a simple manner from the outside.
  • the formation of the magnetized region 8 on the inner ring surface 26 of the hollow shaft 1 is - compared to arrangements on the outer peripheral surface of a shaft according to the prior art - cheaper because a relatively larger circumferential length for the formation of the magnetization 8 can be used.
  • a heat insulating layer 10 is formed between the support bearing 3 and the support part 2.
  • Heat insulation layer 10 reduces the heat flow which is conducted from the hollow shaft 1 via the support bearing 3 on the support member 2.
  • the carrier part 1 is made of a non-magnetic metallic material, such as aluminum. As a result, the field emitted by the magnetic region 8 is not influenced by the carrier part 2.
  • the transmitter 28 on the circuit board 16 is housed in an electronics housing 14, 15. This consists of an electronics housing lower shell 14 and a
  • the electronics housing lower shell 14 is made of a heat insulating material, for example, a polymeric material containing glass fiber portions, by injection molding.
  • the operating temperature of the transfer case can rise to over 150 degrees Celsius.
  • the electronic components are thermally largely decoupled, so their maximum allowable Operating temperature of about 120 degrees Celsius is not exceeded.
  • the electronics housing cover part 15 has projecting from the housing cooling fins.
  • the electronics housing cover part 15 is fastened by fastening screws 21 with an end face of the support part 2. It has a connector 18, through which an electrical plug connection with the circuit board 16 can be produced.
  • the support member 2 and the lid member 14 cause to some extent heat dissipation from the interior 19, which is favorable for the operating temperature of the magnetic field detector components 9.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)

Abstract

L'invention concerne un dispositif pour mesurer, sans contact, un couple transmis par un arbre monté de manière rotative dans un carter de boîte de vitesses d'un véhicule automobile. Selon l'invention, cet arbre est configuré en tant qu'arbre creux au moins dans une section transmettant le couple, et une ouverture ménagée dans l'arbre creux côté carter est accessible de l'extérieur par un évidement formé dans le carter de boîte de vitesses. Le dispositif selon l'invention comprend : une zone aimantée qui est configurée sur une surface de bague intérieure (26) dans la zone transmettant le couple de l'arbre creux (1), et qui émet dans l'espace creux (19) un champ magnétique dépendant du couple ; un détecteur de champ magnétique qui est disposé sur une pièce de support insérable dans l'espace creux, et qui détecte le champ magnétique dépendant du couple. Une fois insérée, la pièce de support est montée sur une section faisant saillie dans l'espace creux par l'intermédiaire d'un palier d'appui, l'autre extrémité de cette pièce de support étant guidée hors de l'évidement et fixée sur le carter de boîte de vitesses.
PCT/EP2006/062166 2005-07-12 2006-05-09 Dispositif pour mesurer le couple au niveau de l'arbre de transmission d'un vehicule automobile WO2007006595A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATGM476/2005 2005-07-12
AT0047605U AT8935U1 (de) 2005-07-12 2005-07-12 Vorrichtung zur berührungslosen messung des drehmomentes an einer getriebewelle eines kraftfahrzeugs

Publications (1)

Publication Number Publication Date
WO2007006595A1 true WO2007006595A1 (fr) 2007-01-18

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Application Number Title Priority Date Filing Date
PCT/EP2006/062166 WO2007006595A1 (fr) 2005-07-12 2006-05-09 Dispositif pour mesurer le couple au niveau de l'arbre de transmission d'un vehicule automobile

Country Status (2)

Country Link
AT (1) AT8935U1 (fr)
WO (1) WO2007006595A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090659A1 (fr) 2008-02-14 2009-08-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Particule infectieuse, son processus de préparation et utilisation
US8423249B2 (en) 2011-01-20 2013-04-16 GM Global Technology Operations LLC Torque sensor system with integrated electrical connectors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015110353A1 (de) * 2015-06-26 2016-12-29 Dr. Fritz Faulhaber Gmbh & Co. Kg Getriebe für Klein- und Kleinstantrieb mit Drehmomentmessglied

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011340A (en) * 1957-06-26 1961-12-05 Asea Ab Means for measuring a torsional stress in a shaft of magnetostrictive material
DE3818449A1 (de) * 1988-05-31 1989-12-07 Letay Gabriel Dipl Ing Arbeitsspindel fuer hohe biegebelastung und drehmomentmessung durch torsion
US4942771A (en) * 1987-06-15 1990-07-24 Nissan Motor Co., Ltd. Magnetostriction type torque sensor
US20040035222A1 (en) * 2000-09-12 2004-02-26 May Lutz Axel Magnetic torgue sensor system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011340A (en) * 1957-06-26 1961-12-05 Asea Ab Means for measuring a torsional stress in a shaft of magnetostrictive material
US4942771A (en) * 1987-06-15 1990-07-24 Nissan Motor Co., Ltd. Magnetostriction type torque sensor
DE3818449A1 (de) * 1988-05-31 1989-12-07 Letay Gabriel Dipl Ing Arbeitsspindel fuer hohe biegebelastung und drehmomentmessung durch torsion
US20040035222A1 (en) * 2000-09-12 2004-02-26 May Lutz Axel Magnetic torgue sensor system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090659A1 (fr) 2008-02-14 2009-08-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Particule infectieuse, son processus de préparation et utilisation
US8423249B2 (en) 2011-01-20 2013-04-16 GM Global Technology Operations LLC Torque sensor system with integrated electrical connectors

Also Published As

Publication number Publication date
AT8935U1 (de) 2007-02-15

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