WO1994002825A1 - Procede et appareil de verification d'amortisseurs et de systemesde suspension - Google Patents

Procede et appareil de verification d'amortisseurs et de systemesde suspension Download PDF

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Publication number
WO1994002825A1
WO1994002825A1 PCT/GB1993/001453 GB9301453W WO9402825A1 WO 1994002825 A1 WO1994002825 A1 WO 1994002825A1 GB 9301453 W GB9301453 W GB 9301453W WO 9402825 A1 WO9402825 A1 WO 9402825A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
wheel
roller
wheels
rollers
Prior art date
Application number
PCT/GB1993/001453
Other languages
English (en)
Inventor
Richard Savill Truelove
Keith Richard Whittington
Original Assignee
Richard Savill Truelove
Keith Richard Whittington
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
Priority claimed from GB929214995A external-priority patent/GB9214995D0/en
Priority claimed from GB929223256A external-priority patent/GB9223256D0/en
Application filed by Richard Savill Truelove, Keith Richard Whittington filed Critical Richard Savill Truelove
Priority to EP93916050A priority Critical patent/EP0650588A1/fr
Priority to AU45759/93A priority patent/AU4575993A/en
Priority to JP6504245A priority patent/JPH07509066A/ja
Publication of WO1994002825A1 publication Critical patent/WO1994002825A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/04—Suspension or damping
    • G01M17/045—Suspension or damping the vehicle wheels co-operating with rotatable rollers

Definitions

  • the maintenance of uniform contact pressure between the wheels and the road surface at all times is particularly important, but especially difficult to achieve, when the vehicle is travelling over a rough or pave surface where there is a significant tendency, which the shock absorbers are there to counter, for the wheel or wheels to bounce when hitting a lump or other defect in the road surface, and momentarily to lose contact altogether with the road surface, or at least undergoing a significant temporary reduction in the contact pressure between the wheel and the road surface.
  • Wheel bounce of that kind can cause significant loss of traction when driving at speed over a rough surface, loss of grip when cornering, and loss of grip when braking.
  • road holding characteristics of that kind are not a function of any one shock absorber, but rather of the complete suspension system of the vehicle.
  • a method of measuring automotive suspension performance as a whole, and in the workshop rather than out on the road would be much in demand. So also would be a system that can measure suspension performance objectively rather than subjectively.
  • the present invention also provides an apparatus for conducting the method according to the present invention.
  • the at least one roller is mounted for concentric rotation about a horizontal axis and in step ii. the roller is simultaneously vibrated in the vertical direction thereby to cause the at least one wheel to vibrate vertically whilst being so driven.
  • the above described method and apparatus are based on the concept of positively driving the vehicle wheels on a simulated "rough" road surface against an applied braking force and detecting any slip which occurs between the wheel and the simulated road surface, e.g.
  • a method of testing vehicle suspension systems in situ which comprises placing the vehicle on a rolling road surface provided by at least one roller or pair of parallel rollers supporting the front or rear wheels of the vehicle, or several such rollers or pairs of rollers supporting both the front and rear wheels of the vehicle, the roller or at least one roller in the or each pair either having an irregular or eccentric surface or else being eccentrically mounted so as to impart a vertical vibratory motion to the suspension system of the vehicle when driven on that surface, positively driving the vehicle at a predetermined speed on that rolling surface, applying a controlled braking pressure to the vehicle's braking system to provide a predetermined retardation force acting on the vehicle, and whilst that retardation force is applied measuring and comparing the rotational speed of the roller(s) with the rotational speed of the vehicle wheels.
  • an apparatus for the in situ testing of suspension systems comprising a rolling road surface provided by a roller or at least one pair of parallel rollers positioned to support one or more of the vehicle wheels, when the vehicle is positioned on the rolling road surface, means for actuating the braking system of the vehicle to apply a controlled braking force to the vehicle, means for driving one or more of the rollers forming the rolling road surface to rotate the vehicle wheel or wheels against the applied braking force, and means for measuring and comparing the rotational speeds of the wheel or wheels resting on the roller(s) with the rotational speed of the roller(s) , the or at least one of said rollers either having an irregular or eccentric surface or being eccentrically mounted, whereby when the roller is rotated, a vertical vibratory movement is imparted to the automotive suspension system as the wheels are rotated, and which movement is absorbed or not absorbed, as the case may be, by the suspension system of the vehicle under test.
  • the vehicle under test is fitted with an anti-lock braking system, and the anti-lock braking system is deactivated for the purposes of the test.
  • the vertical vibratory motion is imparted to the suspension system of the vehicle under test by two eccentric or cam-shaped rollers rotating about a common axis and located one on each side of the test vehicle, the roller eccentricities or cam surfaces being angularly spaced one from the other thereby imparting to the vehicle suspension system vertical vibratory motions which are out of phase on opposite sides of the vehicle.
  • said eccentricities or cam surfaces are spaced and have the same phase or are 180° out of phase.
  • the eccentricities or cam surfaces are movable relative to each other from being in phase to being 180° out of phase.
  • the means for actuating the braking system of the vehicle under test comprises a variable force producing means capable of varying the actuating force applied to the braking system of the vehicle, such apparatus also including means for continuously monitoring the retardation force applied to the vehicle during the test procedure, and feed back means responsive to said monitoring means for automatically adjusting the operating force applied to the braking system of the vehicle by said variable force producing means, thereby to keep the said retardation force substantially constant.
  • the rolling road surface comprises either a pair of adjacent parallel rollers upon and between which either the front or rear wheels of the vehicle rest during the test procedure, or two such pairs of rollers upon and between which both the front and rear wheels rest during the test procedure.
  • the means for measuring and comparing the rotational speeds of the wheel or wheels of the vehicle under test and the rotational speed of the roller(s) includes means for providing an output signal proportional to the difference between the two speeds.
  • the eccentricity of the roller 1 is such as to impose a vertical oscillating motion on the wheels of the vehicle which is representative of that which would be experienced in driving over a bad road surface.
  • Tachometers 5 and 6 monitor the rotational speeds of the wheels 3 and the roller 1.
  • the percentage change in the speed ratio under controlled braking may be used as a quantitative measure of shock absorber or suspension condition.
  • the comparator may incorporate an audible or visual alarm to indicate when slip occurs or when a preset percentage speed ratio change has been exceeded.
  • Figure 2 represents in part, in diagrammatic form, an alternative embodiment of the invention in which this is achieved by positioning the wheels on two rollers 10, 11 so mounted that their eccentricities are out of phase with each other; the phase difference should preferably be 180°.
  • the angular positions of the rollers 10, 11 may be adjustable with respect to each other so that the test may be run with the rollers in phase or out of phase with each other.
  • Figure 5 represents yet another aspect of the invention in which rollers 16, 17 are provided enabling both the front and rear suspension systems of the vehicle to be tested simultaneously.
  • the rollers 13, 14 may be taken to represent any combination of the roller types 1, 10, 11, 12, 13 or 14 described above.
  • the apparatus shown comprises a triangular main frame 101 in which is mounted, for rotation concentrically about a horizontal axis 102, a cylindrical surface roller 103 driven by a belt drive 104 from a motor unit 105.
  • a pivotally mounted rigid radius arm 106 maintains the axis 102 of the roller 103 at a fixed distance from the motor unit 105.
  • the roller 103 can be replaced by a pair of parallel rollers, both mounted on the . resilient block 108, and supporting the vehicle wheel (and the vehicle) between the nip of the two rollers.
  • the apparatus may be constructed for the purpose of testing one suspension unit only, e.g. the offside or nearside suspension unit at either the front or the rear of the vehicle, or the front suspension only, or the rear suspension only, or the complete vehicle suspension system, in which case two units such as shown in the drawing will be provided spaced one from the other and supporting both the front and rear wheels of the vehicle.
  • the test procedure is carried out substantially as previously described, and need not be described in detail here.
  • the test comprises driving the roller 103 at a constant speed via the motor unit 104, thereby driving the wheel or wheels 111 at a constant speed against an applied braking force applied via the vehicle's braking system, or in some other convenient manner when a single separate shock absorber is under test, rather than in situ in a vehicle.
  • the roller 103 is reciprocated vertically by the crank 109. This imparts a vertical vibratory movement or "bounce" to the wheel 111 as it is driven on the roller 3, that vibratory movement being absorbed, or not as the case may be, by the shock absorber 112.
  • ABS Anti-lock Braking Systems
  • a signal may be derived from the ABS unit to indicate the onset of slip.
  • this ABS unit signal is used as an indicator in place of the tachometers previously described.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Vehicle Body Suspensions (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)

Abstract

L'invention se rapporte à un système de vérification dynamique permettant de vérifier l'état des amortisseurs et des systèmes de suspension. Le système de vérification consiste à placer le véhicule (20) sur une surface de route qui effectue un mouvement de roulement produit par au moins un rouleau ou une paire de rouleaux parallèles (1) soutenant les roues avant et arrière du véhicule, ou plusieurs rouleaux ou paires de rouleaux de ce type soutenant à la fois les roues avant et arrière (3) du véhicule, le rouleau, ou au moins un rouleau dans la paire ou dans chaque paire présentant une surface irrégulière ou excentrique, ou étant monté excentrique de façon à communiquer un mouvement vibratoire vertical au système de suspension du véhicule lorsque celui-ci est conduit sur la surface; à conduire le véhicule à une vitesse prédéterminée sur cette surface roulante, soit à l'aide de la propre puissance motrice du véhicule ou, de préférence par l'entraînement d'un ou plusieurs des rouleaux; à appliquer une pression de freinage régulée au système de freinage du véhicule pour appliquer une force de ralentissement prédéterminée au véhicule; et, tandis que cette force de ralentissement est appliquée, à mesurer et à comparer la vitesse rotative du ou des rouleaux à la vitesse rotative des roues du véhicule.
PCT/GB1993/001453 1992-07-15 1993-07-13 Procede et appareil de verification d'amortisseurs et de systemesde suspension WO1994002825A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP93916050A EP0650588A1 (fr) 1992-07-15 1993-07-13 Procede et appareil de verification d'amortisseurs et de systemesde suspension
AU45759/93A AU4575993A (en) 1992-07-15 1993-07-13 Method and apparatus for testing shock absorbers and suspension systems
JP6504245A JPH07509066A (ja) 1992-07-15 1993-07-13 緩衝器及び懸架システムを試験するための方法及び装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB929214995A GB9214995D0 (en) 1992-07-15 1992-07-15 Method and apparatus for testing automotive shock absorbers and suspension systems
GB9214995.4 1992-07-15
GB9223256.0 1992-11-06
GB929223256A GB9223256D0 (en) 1992-11-06 1992-11-06 Improved method and apparatus for testing automotive shock absorbers and suspension systems

Publications (1)

Publication Number Publication Date
WO1994002825A1 true WO1994002825A1 (fr) 1994-02-03

Family

ID=26301258

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001453 WO1994002825A1 (fr) 1992-07-15 1993-07-13 Procede et appareil de verification d'amortisseurs et de systemesde suspension

Country Status (5)

Country Link
EP (1) EP0650588A1 (fr)
JP (1) JPH07509066A (fr)
AU (1) AU4575993A (fr)
CA (1) CA2138767A1 (fr)
WO (1) WO1994002825A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1008461A3 (nl) * 1994-06-21 1996-05-07 Geysen Rudiger Jean Gilbert Werkwijze en inrichting voor het testen van wagens.
WO1999060368A1 (fr) * 1998-05-18 1999-11-25 Robert Bosch Gmbh Dispositif pour tester des suspensions de roue
WO1999060367A1 (fr) * 1998-05-18 1999-11-25 Robert Bosch Gmbh Dispositif d'essai de suspension de roue
DE19963556A1 (de) * 1999-12-29 2001-07-19 Bosch Gmbh Robert Prüfvorrichtung für Kraftfahrzeuge
DE19505682B4 (de) * 1994-02-18 2005-11-24 Rolf Kistner Geräuschsimulator
WO2015187455A1 (fr) * 2014-06-03 2015-12-10 Magee Garth L Procédé et appareil pour la mesure d'une puissance de propulsion d'un véhicule à roues
JP2017090161A (ja) * 2015-11-06 2017-05-25 トヨタ自動車株式会社 実車走行試験装置
CN111982542A (zh) * 2020-09-01 2020-11-24 新昌县正林机械有限公司 摩托车减震器疲劳试验装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2225164A1 (de) * 1972-05-24 1973-12-06 Dieter Dipl Ing Lutz Vorrichtung zur ueberpruefung der wirksamkeit von schwingungsdaempfern an radaufhaengungen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2225164A1 (de) * 1972-05-24 1973-12-06 Dieter Dipl Ing Lutz Vorrichtung zur ueberpruefung der wirksamkeit von schwingungsdaempfern an radaufhaengungen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505682B4 (de) * 1994-02-18 2005-11-24 Rolf Kistner Geräuschsimulator
BE1008461A3 (nl) * 1994-06-21 1996-05-07 Geysen Rudiger Jean Gilbert Werkwijze en inrichting voor het testen van wagens.
WO1999060368A1 (fr) * 1998-05-18 1999-11-25 Robert Bosch Gmbh Dispositif pour tester des suspensions de roue
WO1999060367A1 (fr) * 1998-05-18 1999-11-25 Robert Bosch Gmbh Dispositif d'essai de suspension de roue
DE19963556A1 (de) * 1999-12-29 2001-07-19 Bosch Gmbh Robert Prüfvorrichtung für Kraftfahrzeuge
DE19963556C2 (de) * 1999-12-29 2003-04-10 Bosch Gmbh Robert Prüfvorrichtung für Kraftfahrzeuge
WO2015187455A1 (fr) * 2014-06-03 2015-12-10 Magee Garth L Procédé et appareil pour la mesure d'une puissance de propulsion d'un véhicule à roues
JP2017090161A (ja) * 2015-11-06 2017-05-25 トヨタ自動車株式会社 実車走行試験装置
CN111982542A (zh) * 2020-09-01 2020-11-24 新昌县正林机械有限公司 摩托车减震器疲劳试验装置

Also Published As

Publication number Publication date
AU4575993A (en) 1994-02-14
JPH07509066A (ja) 1995-10-05
CA2138767A1 (fr) 1994-02-03
EP0650588A1 (fr) 1995-05-03

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