WO1991002226A1 - Dispositif de mesure de forces pour dispositifs d'attelage de remorques - Google Patents

Dispositif de mesure de forces pour dispositifs d'attelage de remorques Download PDF

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Publication number
WO1991002226A1
WO1991002226A1 PCT/SE1990/000502 SE9000502W WO9102226A1 WO 1991002226 A1 WO1991002226 A1 WO 1991002226A1 SE 9000502 W SE9000502 W SE 9000502W WO 9102226 A1 WO9102226 A1 WO 9102226A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
measurement device
sensor
plates
force measurement
Prior art date
Application number
PCT/SE1990/000502
Other languages
English (en)
Inventor
Bertil Hök
Stig Kristensen
Original Assignee
Siarr Sweden Ab
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 Siarr Sweden Ab filed Critical Siarr Sweden Ab
Publication of WO1991002226A1 publication Critical patent/WO1991002226A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/58—Auxiliary devices
    • B60D1/62—Auxiliary devices involving supply lines, electric circuits, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/01—Traction couplings or hitches characterised by their type
    • B60D1/06—Ball-and-socket hitches, e.g. constructional details, auxiliary devices, their arrangement on the vehicle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
    • G01G19/12—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles having electrical weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/13—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the tractive or propulsive power of vehicles
    • G01L5/136—Force sensors associated with a vehicle traction coupling

Definitions

  • the invention relates to a force measurement device for
  • the coupling comprising a coupling part, e.g. a towing ball, rigidly connected to a first stiff holder plate, which is fastened by fastening means to a corresponding second, similarly stiff holder plate mounted on the towing or towed vehicle, preferably on the towing vehicle.
  • a coupling part e.g. a towing ball
  • the vertical force varies in response to the load distribution on the towed vehicle, particularly with a singleaxle vehicle, and it is therefore desirable to measure this force continuously.
  • the main object of the invention is to provide against this background a force measurement device enabling continuous, reliable measurement of the vertical force component, acting on the coupling, without the horizontal component effecting the measurement results.
  • a further object is to give the force measurement device a specially simple implementation.
  • a still further object is that the measurement result shall as far as possible be independent of extraneous environmental parameters such as temperature, moisture etc.
  • the stated main object is achieved with a structure of the force measurement device according to claim 1. Suitable further characterizing features are disclosed in claims 2 - 13.
  • Fig. 1 is a perspective, exploded view of parts of a coupling having a towing ball and mounted on an unillustrated towing vehicle;
  • Fig. 2 is a vertical cross-section to a larger scale through the plates illustrated in Fig. 1;
  • Fig. 3a is a plane (to a smaller scale) of the left hand one of the intermediate plates of Fig. 2, seen from the right in fig. 2;
  • Fig. 3b schematically illustrates an electrical transducer circuit mounted on the plate according to Fig. 3a;
  • Fig. 4 is a plane view of a modified embodiment of the intermediate plate illustrated in Figs. 1 and 2, in this case being a single plate provided with another type of transducer;
  • Fig. 4b schematically illustrates an electrical transducer circuit associated with the plate in Fig. 4a.
  • unillustrated towing vehicle and is provided with a towing ball 2, intended for being removably connected to a coupling part adapted thereto and mounted on an unillustrated towed vehicle.
  • a towing ball 2 is rigidly connected, suitably by welding, to a first, rectangular, stiff holder plate 4. Together with an intermediate, flat sensor means 5 this plate is fastened to a second, similarly rectangular, stiff holder plate 6 mounted on the towing vehicle with the aid of a holder arm 7.
  • Each of the plates 4, 5 and 6 has two through holes 4a, 4b (4b not being visible in the figures), 5a, 5b and 6a, 6b, through which unillustrated bolts extend along the respective hole axis line A,B and are tightened with the aids of nuts, when the coupling is in an assembled state, such that the plates are mutually pre-stressed against each other (cf. Fig. 2) with the intermediary of spacers in the form of strips 8a, 8b, 9a, 9b, 9c.
  • the hole axis lines A and B for the bolts are in a horizontal plane of symmetry for the plates 4, 5, 6, the stiff holder plates 4 and 6 thus being restrictedly pivotable in relation to each other (about a horizontal axis which is at right angles to the lines A and B) under the action of a vertical force
  • a sensor plate 10 included in the sensor means 5 In the sensor means 5 according to Figs. 1 and 2 there is also included a directly engaging sensor plate 11, i.e. one without the intermediary of spacers. Both these sensor plates 10, 11 are made of a material which has substantially greater elasticity than the steel holder plates 4 and 6, namely a glass fibre reinforced epoxy plastics laminate, as is normally used for circuit boards.
  • the spacer strips 8a, 8b, 9a, 9b and 9c also consist of such material and are glued to the sensor plates 10, 11.
  • Horizontal, tensional forces (perpendicular to the arrow P in Fig. 1) acting on the ball 2 are substantially taken up by the unillustrated bolts.
  • the horizontally acting tensional force components can be caused to act in the horizontal plane defined by the axis lines A and B.
  • the spacer strips 8a, 8b, 9a, 9b, 9c extend horizontally
  • the upper portion of the sensor plate 10 will be deflected in a corresponding way in the region of the strip 8a in a direction towards the constantly flat sensor plate 11, while its lower portion is kept substantially flat and positioned at a constant distance from the sensor plate 11.
  • the spacer strips are placed such that on one side of the deflectable sensor plate 10 (to the right in Fig. 2) they are situated centrally along a straight line in the region for the unillustrated bolts and the holder arm 3 attachment to the holder plate 4 (the strip 9b) and also along the opposite edge portions of the sensor plate 10 parallel to said straight line (the strips 9a and 9c), the strips on the other side of the deflectable sensor plate 10 (to the left in Fig. 2), being situated in two intermedxate regions, suitably half way between said straight line and the respective edge portion (the strips 8a and 8b).
  • the intermediate space between the holder plate 4 and the sensor plate 11 is also provided with two spacer strips completely corresponding to the strips 8a, 8b depicted in Fig. 2.
  • both sensor plates 10, 11 will be deflected by a vertical force component acting on the ball.
  • the function will be the same.
  • capacitor plates 10a, 11a and 10b, lib situated directly opposite each other in the respective deflecting region.
  • These capacitor plates consist of metal coatings on the sensor plates 10 and 11 and are connected to an electrical transducer circuit, which will now be described with reference to Figs. 3a and 3b.
  • Fig. 3a the sensor plate 10 is illustrated seen from the right in Fig. 2, although in a smaller scale.
  • the capacitor plates 10a, 10b together with the opposing capacitor plates 11a, lib placed on the constantly flat sensor plate 11 form two capacitors C 1 and C 2 , the capacitances of which are responsive to the mutual spacing between the respective plate pairs 10a, 11a and 10b, 11b.
  • the capacitors C 1 and C 2 are connected in series which each other to form an electrical transducer circuit, the conductors and components of which are mounted on the sensor plate 10, also serving as a circuit board (apart from the capacitor plates 10a, 10b only the components OP, R F and C F are depicted in Fig. 3a).
  • the components of the transducer circuit may of course be mounted on the constantly flat sensor plate 11.
  • the transducer circuit according to Fig. 3b essentially comprises an oscillator circuit 12, which includes the capacitors C 1 and C 2 , an operational amplifier OP, a resistor R F and a capacitor C F , which are connected as shown in the figure, there also being a monostable flip-flop or Schmitt trigger 13 connected to the output of the operational amplifier OP, and a low-pass filter 14.
  • this circuit 12-14 there is obtained on the output of the oscillator 12 a signal with an intermediate frequency (e.g. in the order of 500 kHz), this frequency being responsive to the quotient between the
  • capacitance values can vary from about 100 pF in an unloaded state to about 120-130 pF for maximum deflection (with a decrease of the plate spacing from about 0.5 mm to about 0.2 mm).
  • the device is thus fairly insensitive to external environmental conditions.
  • the frequency which is responsive to the vertical force component, is converted in the trigger and low-pass filter circuits 13, 14 to a direct voltage, which after calibration (in post-coupled detector circuits in an electronic instrument part installed in the towing vehicle) corresponds to the magnitude and direction of the vertical force component, and which can be taken from the connection terminals of the sensor plate 10 (earth, signal and voltage feed) via an unillustrated cable connected between the sensor means 5 and the electrical system of the towing vehicle (with an associated instrument for displaying the vertical force value).
  • a direct voltage which after calibration (in post-coupled detector circuits in an electronic instrument part installed in the towing vehicle) corresponds to the magnitude and direction of the vertical force component, and which can be taken from the connection terminals of the sensor plate 10 (earth, signal and voltage feed) via an unillustrated cable connected between the sensor means 5 and the electrical system of the towing vehicle (with an associated instrument for displaying the vertical force value).
  • the sensor plates and spacer means can of course be arranged in another way than the one shown, provided that the required deflection or pivoting of the movable sensor plate is achieved (optionally two or more movable plates can also be arranged), preferably symmetrically for separating upwardly and downwardly directed forces. It is also possible to place the holder plates 4 and 6 with the intermediate sensor means 5 oriented horizontally in the tensional force plane, although the bolts will here be subjected to shear forces and must therefore be dimensioned accordingly.
  • Figs. 4a and 4b An alternative transducer embodiment is illustrated in Figs. 4a and 4b, the sensor plate 5' being intended to replace both plates 10, 11 in Fig. 2 (although with spacer strips 8a, 8b, 9a, 9b, 9c placed in a corresponding manner for similar deflection of the upper end lower portions of the plate 5' under the action of the vertical force component).
  • the sensor plate 5' consists of a circuit board laminate of glass fibre reinfoced epoxy plastics and provided with resistor elements R 1 and R 2 , which consist of metal foil loops etched directly out of the sensor plate, and which are included in a bridge circuit (Fig. 4b) for providing an output voltage V ut .
  • This output voltage V ut is responsive to the deflection of the plate 5' in the region of the respective resistor element R 1 , R 2 , since the latter alter their resistance in response to the strain in the vertically extending portions caused by deflection of the plate, these portions suitably being situated relatively close to each other.
  • a quotient is also measured in this case, namely R 1 /R 2 so that the magnitude and direction (upwards and downwards) of the vertical force component can be indicated reliably with the aid of the bridge circuit in Fig. 4b and a connected detector circuit in the instrument part installed in the towing vehicle.
  • conventional wire strain gauges can of course be applied to the deflecting plate 5' or to corresponding separate plates on each side of the plane defined by the axis lines A, B (Fig. 1).
  • the force measuring device described above can also be modified by one skilled in the art within the scope of the following claims.
  • the sensor means can be placed between two holder plates on the connecting part associated with the towed vehicle.
  • stiff and relatively elastic spacer means so that the sensor plate is pivoted under the action of the vertical force component.
  • Capacitive measurement is preferably utilized in this case, e.g. according to Figs. 3a and 3b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

Dispositif de mesure de force permettant de mesurer la composante (P) de force verticale agissant sur un attelage (1) entre un véhicule de remorquage et un véhicule remorqué. Ledit attelage comprend deux plaques de support rigides (4, 6) ainsi qu'un moyen de détection intermédiaire (5) comportant au moins une plaque de détection (10) pouvant être défléchie ou pivotante. Ladite plaque de détection (10) défléchit ou pivote sous l'action d'une force verticale (P) exercée par les plaques de support (4, 6) pivotant mutuellement de manière limitée. On a prévu des moyens d'espacement (8a, 8b, 9a, 9b, 9c) lesquels sont placés en une relation étagée entre ladite plaque de détection (10) et la plaque de support respective (4, 6) se trouvant de chaque côté du moyen de fixation maintenant lesdites plaques de support ainsi que le moyen de détection intermédiaire ensemble. Des transducteurs sont agencés sur ladite plaque de détection (10) pouvant être défléchie ou pivotante, afin de détecter le défléchissement ou le mouvement pivotant, et afin d'émettre un signal électrique correspondant à la force verticale (P).
PCT/SE1990/000502 1989-08-04 1990-07-25 Dispositif de mesure de forces pour dispositifs d'attelage de remorques WO1991002226A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902673-6 1989-08-04
SE8902673A SE464374B (sv) 1989-08-04 1989-08-04 Kraftmaetaranordning foer maetning av vertikalkraftkomponenten verkande paa ett kopplingsdon mellan ett dragfordon och ett slaepfordon

Publications (1)

Publication Number Publication Date
WO1991002226A1 true WO1991002226A1 (fr) 1991-02-21

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ID=20376630

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000502 WO1991002226A1 (fr) 1989-08-04 1990-07-25 Dispositif de mesure de forces pour dispositifs d'attelage de remorques

Country Status (3)

Country Link
AU (1) AU6149890A (fr)
SE (1) SE464374B (fr)
WO (1) WO1991002226A1 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2270985A (en) * 1992-09-23 1994-03-30 John William Leslie Sansome A trailer hitch load-sensing arrangement
EP0589688A1 (fr) * 1992-09-23 1994-03-30 John William Leslie Sansome Procédé et dispositif à utiliser avec une remorque
FR2701671A1 (fr) * 1993-02-17 1994-08-26 Fischer Georg Verkehrstechnik Equipement en moyens de mesure d'un véhicule à sellette pour semi-remorques.
FR2701672A1 (fr) * 1993-02-17 1994-08-26 Fischer Georg Verkehrstechnik Montage de moyens de mesure sur un véhicule semi-remorque.
DE4419673A1 (de) * 1994-06-07 1995-12-14 Hottinger Messtechnik Baldwin Anhängerkupplung mit einem Kraftaufnehmer
GB2348508A (en) * 1999-04-01 2000-10-04 Kenneth Stephen Evans Tow coupling sensor assemblies
DE10211572A1 (de) * 2002-03-15 2003-10-02 Bernd Basteck Stützlastüberwachung für Anhänger
FR2856362A1 (fr) * 2003-06-18 2004-12-24 Bosch Gmbh Robert Procede de regulation de frein d'une remorque de vehicule automobile
DE20316698U1 (de) * 2003-10-30 2005-03-17 Knott Gmbh Anhängerdeichsel für Fahrzeuganhänger mit Überwachungseinrichtung für die Wirksamkeit einer Stabilisierungskugelkupplung
GB2417332A (en) * 2004-08-19 2006-02-22 Bradley Doublelock Ltd Monitoring loading of a trailer
WO2012084136A1 (fr) 2010-12-24 2012-06-28 Agco Sa Attelage arrière de tracteur
EP2452839B1 (fr) 2010-11-16 2015-05-06 Scambia Holdings Cyprus Limited Dispositif de support
US10071610B2 (en) 2015-10-30 2018-09-11 Cnh Industrial America Llc System and method for improved ride control for a work vehicle when transporting a drawn implement
US20190293506A1 (en) * 2018-03-22 2019-09-26 Wabco Gmbh Force or torque measuring device for a motorized vehicle with an attachment
US20190293505A1 (en) * 2018-03-22 2019-09-26 Wabco Gmbh Force or torque measuring device for a motorized vehicle with an attachment
US10633023B2 (en) 2017-10-23 2020-04-28 Ford Global Technologies, Llc System and method for trailer-car initial hitching angle detection by force-based sensing system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2005646B2 (de) * 1969-07-02 1979-12-13 Weigh-Tronix, Inc., Armstrong, Ia. (V.St.A.) Elektromagnetische Wägeeinrichtung
US4319766A (en) * 1980-06-25 1982-03-16 General Motors Corporation Vehicle trailer hitch
SE457383B (sv) * 1984-01-31 1988-12-19 Slim Borgudd Sensoranordning innefattande en basplatta med ett flertal elektrodpar
EP0302437A2 (fr) * 1987-08-05 1989-02-08 Pfister GmbH Dispositif de mesure de force

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2005646B2 (de) * 1969-07-02 1979-12-13 Weigh-Tronix, Inc., Armstrong, Ia. (V.St.A.) Elektromagnetische Wägeeinrichtung
US4319766A (en) * 1980-06-25 1982-03-16 General Motors Corporation Vehicle trailer hitch
SE457383B (sv) * 1984-01-31 1988-12-19 Slim Borgudd Sensoranordning innefattande en basplatta med ett flertal elektrodpar
EP0302437A2 (fr) * 1987-08-05 1989-02-08 Pfister GmbH Dispositif de mesure de force

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2270985A (en) * 1992-09-23 1994-03-30 John William Leslie Sansome A trailer hitch load-sensing arrangement
EP0589688A1 (fr) * 1992-09-23 1994-03-30 John William Leslie Sansome Procédé et dispositif à utiliser avec une remorque
FR2701671A1 (fr) * 1993-02-17 1994-08-26 Fischer Georg Verkehrstechnik Equipement en moyens de mesure d'un véhicule à sellette pour semi-remorques.
FR2701672A1 (fr) * 1993-02-17 1994-08-26 Fischer Georg Verkehrstechnik Montage de moyens de mesure sur un véhicule semi-remorque.
DE4402525C2 (de) * 1993-02-17 1998-10-29 Fischer Georg Verkehrstechnik Anordnung von Meßmitteln an einem eine Sattelzugmaschine und einen Sattelanhänger aufweisenden Sattelfahrzeug
DE4419673A1 (de) * 1994-06-07 1995-12-14 Hottinger Messtechnik Baldwin Anhängerkupplung mit einem Kraftaufnehmer
EP0686839A3 (fr) * 1994-06-07 1996-02-28 Hottinger Messtechnik Baldwin Attelage de remorque avec capteur de force
DE4419673C2 (de) * 1994-06-07 1998-03-12 Hottinger Messtechnik Baldwin Anhängerkupplung mit einem Kraftaufnehmer
GB2348508A (en) * 1999-04-01 2000-10-04 Kenneth Stephen Evans Tow coupling sensor assemblies
GB2348508B (en) * 1999-04-01 2002-10-16 Kenneth Stephen Evans Tow coupling sensor assemblies
DE10211572A1 (de) * 2002-03-15 2003-10-02 Bernd Basteck Stützlastüberwachung für Anhänger
FR2856362A1 (fr) * 2003-06-18 2004-12-24 Bosch Gmbh Robert Procede de regulation de frein d'une remorque de vehicule automobile
DE20316698U1 (de) * 2003-10-30 2005-03-17 Knott Gmbh Anhängerdeichsel für Fahrzeuganhänger mit Überwachungseinrichtung für die Wirksamkeit einer Stabilisierungskugelkupplung
GB2417332A (en) * 2004-08-19 2006-02-22 Bradley Doublelock Ltd Monitoring loading of a trailer
EP2452839B1 (fr) 2010-11-16 2015-05-06 Scambia Holdings Cyprus Limited Dispositif de support
WO2012084136A1 (fr) 2010-12-24 2012-06-28 Agco Sa Attelage arrière de tracteur
US8998240B2 (en) 2010-12-24 2015-04-07 Agco Sa Tractor rear hitch
US10071610B2 (en) 2015-10-30 2018-09-11 Cnh Industrial America Llc System and method for improved ride control for a work vehicle when transporting a drawn implement
US10633023B2 (en) 2017-10-23 2020-04-28 Ford Global Technologies, Llc System and method for trailer-car initial hitching angle detection by force-based sensing system
US20190293506A1 (en) * 2018-03-22 2019-09-26 Wabco Gmbh Force or torque measuring device for a motorized vehicle with an attachment
US20190293505A1 (en) * 2018-03-22 2019-09-26 Wabco Gmbh Force or torque measuring device for a motorized vehicle with an attachment
US10866153B2 (en) * 2018-03-22 2020-12-15 Wabco Gmbh Force or torque measuring device for a motorized vehicle with an attachment
US10871410B2 (en) * 2018-03-22 2020-12-22 Wabco Gmbh Force or torque measuring device for a motorized vehicle with an attachment

Also Published As

Publication number Publication date
SE8902673L (sv) 1991-02-05
SE8902673D0 (sv) 1989-08-04
SE464374B (sv) 1991-04-15
AU6149890A (en) 1991-03-11

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