EP1418011A1 - A method for the assembly of a motor-vehicle wheel - Google Patents

A method for the assembly of a motor-vehicle wheel Download PDF

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Publication number
EP1418011A1
EP1418011A1 EP20030025223 EP03025223A EP1418011A1 EP 1418011 A1 EP1418011 A1 EP 1418011A1 EP 20030025223 EP20030025223 EP 20030025223 EP 03025223 A EP03025223 A EP 03025223A EP 1418011 A1 EP1418011 A1 EP 1418011A1
Authority
EP
European Patent Office
Prior art keywords
wheel
rim
wheel disc
wheel rim
disc
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.)
Withdrawn
Application number
EP20030025223
Other languages
German (de)
English (en)
French (fr)
Inventor
Mario Roetto
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.)
Esam SpA
Original Assignee
Esam SpA
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 Esam SpA filed Critical Esam SpA
Publication of EP1418011A1 publication Critical patent/EP1418011A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like

Definitions

  • the present invention relates to a method for the assembly of a motor-vehicle wheel of the type in which the wheel comprises a disc which is force-fitted and welded in a rim.
  • the invention is equally applicable to both steel wheels and aluminium wheels.
  • a wheel disc 20 is force-fitted in a wheel rim 10 with radial interference ( Figure 1c) by means of a press (not shown), after which the rim and the disc are joined together by welding by means of apparatus indicated S.
  • Some motor-vehicle manufacturers require the wheel rim 10 and the wheel disc 20 to be oriented angularly relative to one another prior to coupling so as to align the valve hole 11 of the wheel rim 10 in a substantially radial plane with one of the through-holes 21 for the stud bolts (not shown) for the mounting of the wheel on the hub (not shown) or with one of the ventilation openings 22 of the wheel disc 20.
  • the object of the present invention is therefore to assemble a wheel of the type specified above whilst addressing mainly the problem of minimizing the resulting eccentricity of the wheel composed of the disc-rim unit, to the extent permitted by the motor-vehicle or wheel manufacturers' specifications.
  • a wheel unit generally indicated 30, comprises a wheel rim 10 and a wheel disc 20 which is fitted completely in the rim 10 in accordance with the present invention.
  • the structural characteristics of the rim 10 and of the disc 20 shown in Figures 2 and 3 may be considered generally known and will not therefore be described in greater detail herein. It will suffice to note here that the rim 10 has a valve hole 11 ( Figure 3) and two opposed and facing radial portions 12, 13 suitable for engaging the sides of the beads of a tyre (not shown) in order to hold the tyre on the rim; each portion 12, 13 is connected to a respective substantially cylindrical or slightly frustoconical portion 14, 15 for the engagement of the opposed inner edges of the tyre.
  • the rim 10 also has an inner, substantially cylindrical portion 16 which constitutes the seat in which the wheel disc 20 is force-fitted and welded.
  • the wheel disc 20 forms a substantially cylindrical outer peripheral edge 23, which is force fitted coaxially in the inner cylindrical portion 16 of the rim 10, and a central opening 24 for receiving a projecting end of a hub (not shown) when the wheel unit 30 is mounted on a vehicle.
  • the central opening 24 is surrounded by a pair of concentric ridges 25, 26 between which four or five circumferentially spaced-apart holes 21 (four in this embodiment) are formed for housing respective stud bolts (not shown) projecting from the hub of the vehicle for fixing the wheel unit 30 and the tyre (not shown) to the vehicle.
  • a plurality of ventilation openings, uniformly spaced apart circumferentially, are indicated 22.
  • the rim 10 is clamped on a rotating chuck, schematically indicated M1, and is rotated about the central axis X1.
  • the chuck M1 clamps the rim 10 by means of jaws or cones acting against the inner cylindrical surface 16 of the rim.
  • three radial jaws are provided, arranged at 120° relative to one another.
  • a pair of feelers or sensors, schematically indicated F14, F15, are connected to an electronic measuring instrument, schematically indicated EM1.
  • the chuck M1 is rotated about its own axis, as indicated by the arrow A, rotating the rim 10. Whilst the rim is rotating about the axis X1, the feelers or sensors F14, F15 detect any variations, relative to the theoretical design values, of the radial distances of a plurality of points on the outer surfaces of the portions 14 and 15 from the centre of the circle.
  • the above-mentioned points are disposed on closed lines resulting from the intersection of the disc and of the rim with respective radial planes (perpendicular to the axis of rotation). Owing to working inaccuracies, these closed lines are in fact never perfect circles.
  • the radial position data of the portions 14 and 15 are transmitted by the measuring instrument E to an electronic processing unit, schematically indicated EPU, - typically a PLC or Programmable Logic Controller, or a PC (personal computer) - which supervises the operation of the measuring apparatus as a whole.
  • EPU electronic processing unit
  • PC personal computer
  • the measuring apparatus correlates the radial position values of the above-mentioned points that are disposed on the outer surfaces of the portions 14 and 15 with respective angular position values of the rim with the use of an encoder (schematically indicted E1) which is fixed for rotation with the chuck M1 and associated with a detection device SD1 which detects the angular position data for the chuck and transmits these data to the unit EPU.
  • an encoder (schematically indicted E1) which is fixed for rotation with the chuck M1 and associated with a detection device SD1 which detects the angular position data for the chuck and transmits these data to the unit EPU.
  • the processing unit EPU correlates the angular position data for the chuck with the radial positions of the various points of the portions 14 and 15 in order to obtain information which is represented herein in the form of a graph (or "harmonic"), indicated D10 in Figure 5, which gives the deviation, relative to the theoretical design values, of the radial distances from the centre of the circle of a plurality of points disposed on a closed line given by the intersection of the outer surface of the portion 14 (or 15) with a radial plane.
  • a graph or "harmonic”
  • a graph D20 is also obtained for the wheel disc 20 and in particular for its cylindrical surface 23 which is to be fitted with radial interference inside the inner cylindrical portion 16 of the wheel rim 10.
  • the disc 20 is mounted on a chuck M2 and rotated about an axis X2 extending through the centre of the central opening 24.
  • a feeler or sensor F23 (which may be of the same type as those indicated F14 and F15 above) detects any variations, relative to the theoretical design value, of the radial distances of a plurality of points of the portion 23 from the centre of the disc.
  • the radial position data for the portion 23 are transmitted by the measuring instrument E2 to the electronic processing unit EPU and are correlated with the corresponding angular position data supplied by a detection device SD2 associated with an encoder E2 fixed for rotation with the chuck M2.
  • the electronic processing unit EPU is provided with applications software for processing the data represented schematically by the graphs D10 and D20 and making results available in the form of data which represent, for each of the components 10 and 20, the extent or absolute value of the eccentricity and its angular position.
  • the processing unit determines the relative angular positions in which the rim and the disc are coupled in order to minimize the overall eccentricity of the rim/disc unit, possibly also taking account of the motor-vehicle manufacturer's particular specifications.
  • the unit EPU calculates the value of the angle ⁇ ( Figure 4c) by which the rim and the disc must be angularly offset in order to be coupled in a manner such as to achieve the least eccentricity of the assembled unit.
  • the unit EPU may bring about a further rotation of one or other of the chucks M1 and/or M2 on which the rim or the disc is mounted in order to position them angularly in the relative position determined by the unit EPU.
  • the errors of eccentricity of the disc and of the rim are compensated by orienting these two components angularly relative to one another in a manner such that their respective eccentricities are substantially opposed with respect to the axis of rotation of the wheel or at least are arranged on opposite sides of the axis of rotation.
  • the expressions "substantially opposed” and “on opposite sides” are also intended to indicate situations in which a motor-vehicle manufacturer requires the valve hole 11 of the rim to be aligned with one of the ventilation openings 22 or with one of the wheel-mounting holes 21. Naturally, in these situations, the overall eccentricity of the assembled wheel will be greater than the minimum eccentricity which would be obtained by diametrically opposing the eccentricities of the rim and of the disc with respect to the axis of rotation.
  • the unit EPU may be programmed so as to control the rotation of the chucks in order to align the valve hole 11 with the ventilation opening 22 or with the fixing hole 21 which is closest to the ideal position calculated.
  • the disc 20 is then fitted in the rim 10 in a manner known per se (see Figure 4d) and, finally, welding apparatus S (Figure 4e) welds the disc to the rim in conventional manner, for example, by spot welds or discontinuous bead welds 40 distributed uniformly around a circumference of the wheel.
  • the assembly method according to the present invention enables the dimensional tolerances of both of the components of the wheel to be checked, thus enabling parts that are clearly defective to be discarded. It will also be appreciated that the invention advantageously permits monitoring of the diameters of the two components to be fitted together and checking of the interference value required by the assembly method.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP20030025223 2002-11-06 2003-11-05 A method for the assembly of a motor-vehicle wheel Withdrawn EP1418011A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20020955 ITTO20020955A1 (it) 2002-11-06 2002-11-06 Metodo per assemblare una ruota di un veicolo a motore.
ITTO20020955 2002-11-06

Publications (1)

Publication Number Publication Date
EP1418011A1 true EP1418011A1 (en) 2004-05-12

Family

ID=32104808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030025223 Withdrawn EP1418011A1 (en) 2002-11-06 2003-11-05 A method for the assembly of a motor-vehicle wheel

Country Status (2)

Country Link
EP (1) EP1418011A1 (it)
IT (1) ITTO20020955A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019102086A1 (fr) 2017-11-27 2019-05-31 Psa Automobiles Sa Vehicule automobile avec roues hybrides et procede de fabrication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391439A (en) * 1966-06-29 1968-07-09 Firestone Tire & Rubber Co Method of making tapered disk wheel
WO1997039321A1 (en) * 1996-04-15 1997-10-23 The Goodyear Tire & Rubber Company Tire and rim assembly centering method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391439A (en) * 1966-06-29 1968-07-09 Firestone Tire & Rubber Co Method of making tapered disk wheel
WO1997039321A1 (en) * 1996-04-15 1997-10-23 The Goodyear Tire & Rubber Company Tire and rim assembly centering method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019102086A1 (fr) 2017-11-27 2019-05-31 Psa Automobiles Sa Vehicule automobile avec roues hybrides et procede de fabrication

Also Published As

Publication number Publication date
ITTO20020955A1 (it) 2004-05-07

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