EP3707487A1 - Machine d'équilibrage possédant un arbre d'équilibrage à blocage de roues de véhicule - Google Patents

Machine d'équilibrage possédant un arbre d'équilibrage à blocage de roues de véhicule

Info

Publication number
EP3707487A1
EP3707487A1 EP18800775.1A EP18800775A EP3707487A1 EP 3707487 A1 EP3707487 A1 EP 3707487A1 EP 18800775 A EP18800775 A EP 18800775A EP 3707487 A1 EP3707487 A1 EP 3707487A1
Authority
EP
European Patent Office
Prior art keywords
balancing
wheel
shaft
clamping
machine
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.)
Ceased
Application number
EP18800775.1A
Other languages
German (de)
English (en)
Inventor
Gino Ferrari
Franco Maioli
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3707487A1 publication Critical patent/EP3707487A1/fr
Ceased legal-status Critical Current

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
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/02—Details of balancing machines or devices
    • G01M1/04—Adaptation of bearing support assemblies for receiving the body to be tested
    • G01M1/045—Adaptation of bearing support assemblies for receiving the body to be tested the body being a vehicle wheel

Definitions

  • the invention concerns a balancing machine with clamping of the wheels of vehicles on the balancing shaft, generally usable to clamp the wheels of vehicles quickly and in a rotational direction, making them temporarily integral with the balancing shaft until the balancing operations are completed, irrespective of the transverse sizes of the wheels.
  • these devices are either manually driven or semi-automatic.
  • a machine for balancing wheels of vehicles typically consists of a base frame that supports cantilevered a rotating and horizontal balancing shaft, on which the wheels to be balanced are fitted and clamped.
  • the wheel to be balanced is loaded onto the balancing shaft, making the latter pass inside the central hole of the rim of the wheel and making it slide until it rests on a transverse flange that is attached on the end of the shaft facing toward the frame.
  • a clamping device is inserted on the balancing shaft which clamps it against the support flange for the time necessary to perform the balancing step and which is removed at the end of this step to free the wheel and remove it from the balancing shaft.
  • a manually driven clamping device comprises a sleeve body which, at one end to be faced toward the wheel, supports a conical tip that is inserted into the central hole of the rim, keeping it raised from the shaft, in a centered position with respect to the latter and keeping the wheel pressed against the support flange.
  • the wheel When the wheel is mounted and fixed on the balancing shaft, the latter is driven in rotation at high speed by means of a suitable motor unit, and a possible transmission connection which are normally housed inside the frame.
  • the balancing machine detects wheel imbalances and the precise imbalance points which are then corrected by the operators by applying corrective weights to the specific points identified by the balancing machine.
  • the clamping device After completing the balancing operations, the clamping device is deactivated and removed from the balancing shaft and the wheel is also removed from the balancing shaft to be reassembled on the vehicle.
  • a pawl coupling is typically provided between the balancing shaft and the sleeve body and a relative and micrometric movement between the latter and the conical tip for the precision insertion of the latter in the central hole of the wheel rim.
  • the device according to this patent comprises a rotating hollow shaft that at one end supports a flange to clamp a wheel cantilevered, a secondary shaft that can obtain a motion of translation inside the hollow shaft by means of preloaded springs in such a way as to keep the secondary shaft raised from the clamping flange, by clamping the wheel in this way.
  • the device also comprises a pneumatic cylinder to make the secondary shaft translate toward the clamping flange, so as to allow the release of the wheel and, at the same time, a further loading of the springs.
  • the clamping device has at least two gas springs which are parallel to the secondary shaft and that are interposed between a pulley rigidly coupled to the hollow shaft and the free end of the secondary shaft.
  • a cylinder is also provided whose stem acts on the end of the secondary shaft which can preload the gas springs to allow the translation movement of the secondary shaft toward the clamping flange and, therefore, allow the release of the wheel.
  • Stops are also provided to stop the stroke of the secondary shaft and elastic elements to make the secondary shaft and the piston rod return into the initial position, allowing the gas springs to restore the clamping of the wheel.
  • a first disadvantage related to manually operated clamping devices is that their positioning and their clamping force are conditioned by the manual skill and accuracy of the operator who, if distracted or not very skilled, risks compromising the correct positioning of the wheel on the balancing shaft and, consequently, making the balancing wrong and useless.
  • a second disadvantage related to the clamping device described in the prior art patent EP0836086 is that the whole group of components that drives the sliding of the secondary shaft inside the hollow balancing shaft rotates together with the latter due to the mechanical constraint provided between the components.
  • imbalances occur that are derived specifically from these components and not just from the wheel to be balanced and that are added to those of the latter.
  • the operators correct the total imbalances detected by the balancing machine during the rotation step of the balancing shaft with on board the wheel to be balanced, but, after the wheel has been disassembled from the latter, it is still imbalanced, having been loaded with correction weights which have incorrect values, distorted by the imbalances caused by the group of rotating components of the balancing machine.
  • One object of the invention is to obviate the disadvantages of the prior art, by providing a balancing machine with a clamping of the wheels of vehicles on the balancing shaft that allows to precisely detect only the real imbalances of a wheel to be balanced, without the imbalance values being influenced by additional imbalances derived from components of the clamping device.
  • Another object of the invention is to provide a balancing machine with a clamping of the wheels of vehicles on the balancing shaft which has a simplified, robust and economical structure compared with known balancing machines.
  • a balancing machine is provided with a clamping of the wheels of vehicles on the balancing shaft, according to the features of claim 1.
  • FIG. 1 is a very schematic view of a balancing machine for balancing wheels of vehicles
  • FIG. 2 is a view in enlarged scale of a portion of the balancing shaft of the machine in fig. 1 ;
  • FIG. 3 is a longitudinal section view of the shaft portion in fig. 2, taken along a plane III-III;
  • FIG. 4 is a schematic sectional view of one portion of fig. 3;
  • FIG. 5 is a schematic sectional view and on a further enlarged scale of the portion in fig. 4;
  • FIG. 6 is a longitudinal section view of the shaft portion in fig. 2 on which a wheel to be balanced has been inserted.
  • a balancing machine with a clamping of wheels 2 of vehicles on the balancing shaft 3 is indicated in its entirety by the reference number 1.
  • the balancing machine 1 typically comprises a base frame 4 which supports the balancing shaft 3 in a horizontal and cantilevered position.
  • the shaft 3 has a longitudinal axis "A" and an axial cavity 5 and defines an intermediate end 3A which faces toward the frame 4 and an opposite distal end 3B that faces toward the outside between which is defined a segment "S" of the balancing shaft which is intended to be inserted into the central hole of a rim of a wheel 2 to be balanced.
  • a support flange 6 is attached on the intermediate end 3A against which a wheel 2 to be clamped is intended to rest.
  • the flange 6 consists of a cylindrical body 7 that defines on one end a circular crown 7A which has a bigger diameter than the diameter of the cylindrical body 7 and which, therefore, protrudes peripherally from it, defining a flat and circular surface 7B to support the wheel 2.
  • clamping means are typically provided that, in the version visible in the drawings, comprise a pair of slots 8 which are made longitudinally in the distal end 3B of the balancing shaft 3, but in diametrically opposite positions from each other, as can be seen in figs. 4 and 5.
  • the clamping means also comprise a cylindrical slider 9 which is mounted sliding inside the axial cavity 5 and can be moved between an active position and an inactive position, as will be explained in more detail later.
  • the slider 9 supports at least one pair of pawls 10, mobile between an engagement position in which they diverge from each other and protrude from the respective slots 8, and a disengagement position in which they converge toward one another and are both retracted from the respective slots 8.
  • the pawls 10 are co-hinged bilaterally to the slider 9 with a pin 10A and can rotate around it according to arc-type trajectories, both diverging from each other toward the outside, and also converging toward the inside of the axial cavity 5.
  • an elastic thrust element 11 is mounted, which closes the axial cavity 5 and which is suitable to keep the contact constant with a corresponding end 9A of the slider 9 and to keep it normally thrust into its active position in which the two pawls 10 protrude from the respective slots 8.
  • the elastic element is loaded by compression when the slider 9 moves with an inactive sliding, in the direction opposite to the frame 4.
  • This inactive sliding causes the two slots 10 to return from the respective slots 8, since the two pawls 10 hit the corresponding end edges of the slots 8 and the latter press them, making them progressively rotate one toward the other toward the inside of the axial cavity 5.
  • the elastic element 11 can be made in different ways: in the version shown in the drawings, the elastic element 1 1 is made in the form of a pre-loaded cylinder 12 with the stem 12A protruding from the sleeve to maintain contact with the end 9A.
  • the cylinder 12 is retained inside the axial cavity 5 in correspondence with the end 3B, for example by means of a screw cap 13.
  • the pre-loaded cylinder 12 can be replaced, for example, by a helical spring (not shown because it is known to the person of skill in the art) loadable by compression, which is housed and held inside the axial cavity 5 in correspondence with the distal end 3B.
  • the slider 9 is driven in axial movement by a drive stem 16 which passes coaxially and in a sliding manner through the whole balancing shaft 3, sliding in an extension 5A of the axial cavity 5 which has a slightly reduced diameter with respect to the diameter of the latter.
  • the drive stem 16 has an end 16A which is screwed into a threaded hollow seating 9B made in the slider 9 on the opposite side to the end 9A of the latter, while the opposite end 16B protrudes for a segment from the extension 5 A of the axial cavity 5 and faces coaxially toward the stem 17 of a pneumatic drive cylinder 18 which is attached inside the frame 4, for example with a flange 4 A.
  • the drive stem 16 is rigidly attached to the slider 9 and transmits its movements to the latter.
  • the end 16B is not rigidly connected to the stem 17, but receives from it, in a specific functioning condition, only an action of axial thrust, as will be described below.
  • a clamping element 19 of a wheel 2 against the support flange 6 is intended to be fitted on the segment "S".
  • the clamping element consists of a cylindrical body 19 that can be fitted accurately and slidably on the segment "S" of the balancing shaft 3 and a hub 20 to contact with a wheel 2 and to thrust it, which is associated with an end 19A of the cylindrical body 19 facing the frame 4.
  • the machine works as follows: a wheel 2 to be balanced is inserted on the balancing shaft 3 of the balancing machine 1 until it rests against the flat surface 7B of the cylindrical body 7.
  • the shaft 3 passes through the central hole which is typically present in the rim of the wheel 2.
  • the pneumatic cylinder 18 is activated so that its stem 17 is in contact with the end 16B of the drive stem 16 and makes it slide inside the extension 5 A of the axial cavity 5.
  • This sliding also moves the slider 9 toward the cylinder 12, thrusting on the stem 12A of the latter, making it retract and loading it by compression.
  • the movement of the slider 9 automatically determines the convergent retraction of both pawls 10 from the respective slots 8, due to the contact of both against the edges of the slots 8, and the consequent compression of the helical spring 14.
  • the pneumatic drive cylinder 18 When the wheel 2 is completely inserted on the shaft 3, the pneumatic drive cylinder 18 is deactivated, the stem 17 retracts and the force of the opposite cylinder 12 previously loaded by compression makes the drive stem 16 move in the opposite direction to the previous one, that is, in the direction of the stem 17, but without coming into contact with it.
  • the displacement of the drive stem 16 also moves the slider 9 in the opposite direction to the previous one and both the pawls 10 vertically realign themselves to the respective slots 8 and are able to again separate from each other with the action of the helical spring 14 and therefore protrude through them, as can be seen in figs. 4 and 5.
  • both pawls 10 although they protrude from the respective slots 8, remain elastically compressible toward each other.
  • the operator in order to clamp the wheel 2 against the flange 6, more precisely against the surface 7B of the circular crown 7A, fits the clamping element 19 onto the shaft 3, making it slide over it.
  • the operator continues the insertion of the clamping element 19 until the hub 20 comes into contact with the wheel 2, pressing it and clamping it against the flange 6.
  • the balancing machine 1 is ready to start the balancing step according to the known procedure.
  • the two pawls 10, due to the sliding of the slider 9, are again pressed into the retracted position by the respective slots 8 toward the inside and the operator can then remove first the clamping device 19 and immediately thereafter also the wheel 2.
  • the balancing machine 1 therefore remains in configuration ready to receive another wheel 2 to be balanced which will be clamped on the balancing shaft as previously described.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)

Abstract

L'invention concerne une machine d'équilibrage (1) à serrage de roues (2) de véhicule sur l'arbre d'équilibrage (3) comprenant un cadre (4), un arbre d'équilibrage (3) maintenu horizontalement en porte-à-faux et possédant une cavité axiale (5, 5A), une extrémité intermédiaire (3 a) tournée vers le cadre et une extrémité distale opposée (3B) tournée vers l'extérieur, entre lesquelles est délimité un segment (S) de l'arbre d'équilibrage ; une bride de maintien (6) d'une roue à équilibrer ; des moyens de serrage (19) de la roue contre la bride comprenant au moins une fente (8) conçue longitudinalement dans l'extrémité distale ; un coulisseau (9) monté coulissant à l'intérieur de la cavité axiale entre une position active et une position inactive et qui maintient au moins un cliquet (10) mobile entre une position de mise en prise et une position de désolidarisation ; un élément élastique (12) permettant de pousser le coulisseau dans la position de mise en prise ; un élément de serrage (19) pouvant être monté coulissant sur l'arbre d'équilibrage ; et possédant une denture (21) réalisée à l'intérieur du corps cylindrique dans lequel le cliquet (10) peut être mis en prise.
EP18800775.1A 2017-11-10 2018-11-08 Machine d'équilibrage possédant un arbre d'équilibrage à blocage de roues de véhicule Ceased EP3707487A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201700128748 2017-11-10
PCT/IT2018/050219 WO2019092768A1 (fr) 2017-11-10 2018-11-08 Machine d'équilibrage possédant un arbre d'équilibrage à blocage de roues de véhicule

Publications (1)

Publication Number Publication Date
EP3707487A1 true EP3707487A1 (fr) 2020-09-16

Family

ID=61527227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18800775.1A Ceased EP3707487A1 (fr) 2017-11-10 2018-11-08 Machine d'équilibrage possédant un arbre d'équilibrage à blocage de roues de véhicule

Country Status (2)

Country Link
EP (1) EP3707487A1 (fr)
WO (1) WO2019092768A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3985372A1 (fr) 2020-10-19 2022-04-20 NEXION S.p.A. Appareil et procédé de verrouillage d'une roue dans une machine d'équilibrage
CN116086703B (zh) * 2022-12-06 2024-05-10 上海剑平动平衡机制造有限公司 一种平衡轴立式全自动平衡机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1072196B (it) * 1977-03-29 1985-04-10 Italiana Costruzioni Elettrome Dispositivo per il bloccaggio automatico delle ruote degli autoveicoli sulle macchine equilibratrici in genere
IT1285485B1 (it) 1996-10-08 1998-06-08 Carlo Buzzi Dispositivo di bloccaggio automatico di ruote e simili su una macchina equilibratrice
DE10238271B4 (de) 2002-08-21 2012-11-08 Snap-On Equipment Gmbh Verfahren und Vorrichtung zum zentrierten Spannen eines Kraftfahrzeugrades auf eine Hauptwelle einer Radauswuchtmaschine
ES2620974T3 (es) 2015-03-12 2017-06-30 Corghi S.P.A. Máquina de servicio de ruedas y método para bloquear una rueda a una unidad de soporte de ruedas

Also Published As

Publication number Publication date
WO2019092768A1 (fr) 2019-05-16

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