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
  • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
  • B21D1/06—Removing local distortions
  • B21D1/08—Removing local distortions of hollow bodies made from sheet metal
• • 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
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/14—Recontouring

Definitions

• TITLE APPARATUS FOR RESTORING THE CENTERING OF TIRE RIMS
• the present invention relates to an apparatus for re-truing or restoring the centering of tire rims.
• the document EP-A-1424145 describes an apparatus for re-centering the rims for tyres, comprising: a rod, which can be connected to a suitable support, can be inserted inside the hole for engaging a rim with the hub of a wheel and provided with means for locking, coaxial with the said rod, the plate of the said rim, so as to position said rod along the direction of the axis of said rim; thruster means able to act in any direction perpendicular to the said rod, movable along the latter and provided with means for adjusting and fixing their position along the said rod.
• the object of the present invention is to provide an apparatus which is- able to make the rim repair operations more precise and easier, allowing an analytical evaluation of the degree of damage during all the stages of re-centering and an accurate check as to the force applied.
• the present invention therefore relates to an apparatus for restoring the centering of tire rims, comprising: a rod which can be inserted into the centring hole for engaging a rim with the hub of a motor vehicle and provided with means for locking, coaxial with the said rod, the fixing plate of the said rim so as to position said rod along the direction of the axis of said rim; thruster means able to act in any direction perpendicular to the rod itself, movable in a direction parallel to the said rod and provided with adjusting and support means and means for fixing their position along the said rod, said rod being mounted rotatably with respect to its axis, provided with actuating means and connected to means for detecting the balancing and geometrical deformation.
• said thruster means are arranged on support means which are mechanically and statically completely independent of said rod.
• Said thruster means may comprise two hydraulic jacks which are situated diametrically opposite each other relative to the axis of the said rod and mounted on a common support which is movable in a direction parallel to the said rod and can be fixed by suitable means in any position with respect to the said rod.
• Said hydraulic jacks are incorporated in a hydraulic circuit which allows them to be controlled so that a first jack is able to bear against the inner side wall of the rim and a second rim able to apply a given thrusting force along the same direction and in a sense diametrically opposite to the first jack, which counterbalances the effect thereof.
• the present invention also relates to a method for restoring the centering of tire rims by means of the apparatus described above, comprising the steps of:
• Figure 1 is a side elevation view of an embodiment of the apparatus according to the present invention.
• Figure 2 is a front elevation view of a detail of Figure 1 , with parts cross- sectioned;
• Figure 3 is a plan view of a detail of the apparatus according to the invention, shown with a rim mounted for machining;
• Figure 4 is a schematic diagram of the hydraulic circuit of an embodiment of the apparatus according to the invention.
• Figure 1 shows an embodiment of the apparatus according to the present invention
• 1 denotes the support frame of the said apparatus, inside which the rod 2 is joined to the actuating means 101 which are connected to detection means 201 in turn connected to the central processing unit 301 which supplies the data acquired and processed to the monitor 401.
• the rod 2 has, at the opposite end to that connected to the said actuating means 101 , a threaded portion 102 having, joined thereto, the rim fixing bush 112 provided with gripping means 122.
• the threaded portion terminates, as will appear more clearly from the figures described below, in a disk 202 which is keyed onto the rod 2.
• the means 3 for guiding- the thrusters 4 and 4', which are connected together by means of the stirrup 104, are arranged concentric with the rod 2.
• the said guide means 3 are connected stably to the bracket 5 projecting out from the frame 1 in the manner better described below.
• Figure 2 shows a front elevation view, with parts cross-sectioned, of a detail according to Figure 1 ; identical parts have been given the same numbers.
• the rod 2 r which is shown cross-sectioned, is surrounded by the support bearing 302 which has, arranged around it, the two guides 3 joined together by means of the bridge-piece 103. Orrthe bottom side, the two guides 3 are fixedrt>y means of the fixing means 225, to the right-angled section 205 which, _by means of the fixing means 2T5, is connected to the U-shaped section 105 which, is in turn joined to the bracket 5 -connected to the support frame of the apparatus.
• Each of the two guides; 3 is provided on the top side with a channel 203 inside which a rail 134 is situated; inside one of the two channels 203, the slide 124 is mounted on the rail 134, said slide being connected to the stirrup 104 which joins the two-thruster means which in Jthe example illustrated are the hydraulic jacks 4 and 4 1 .
• the slide 144 is mounted on the rail 134 and is passed through by a screw pin 164 provided with a knob 174, the other free end of which is able to make contact with the rail 134.
• the hydraulic jacks 4 and 4' are connected to the ends 114 of the stirrup 1D4 in a diametrically opposite position relative to the rod 2 and are provided with the movable pistons 204 and 204', respectively, the movement of which is radial with respect to the rod 2.
• Figure 3 shows the same detail in a plan view from above, with the sole difference that in this case a rim is positioned on the apparatus; here also identical parts have been indicated by the same numbers.
• the rim 10 is arranged with its hole 11 for centring with the hub of the vehicle wheel mounted on the threaded end 102 of the rod 2 and co-operating with the frustoconical end-piece 212 projecting from the disk-202, while the plate 13 of the said rim rests on the disk 202.
• the side wall 12 of the rim is ready to enter into contact with the thrusters 4, 4'.
• FIG. 4 shows schematically an embodiment of the hydraulic circuit of the apparatus according to the present invention
• the pump supplies two circuit branches both provided with maximum pressure valves 206; one branch, which terminates in the hydraulic jack 4' with its piston 204' and the resilient recall-means 214 1 , has, arranged along it, a filling/emptying valve 406 which, when it is operated, allows positioning of the piston 204' bearing againsirthe side wall 12 of the rim 10.
• the other -branch which terminates in the-jack 4 with its piston 204 and ⁇ the -resilient recall means 214, incorporates therein a maximum pressure valve 306, a filling/emptying-valve 506 and,, at the jack connection point, a regulating valve 606 and a-pressure gauge 616.
• the next step envisages operation of the thruster 4', the piston 204' of which is brought into contact with the side wall 12 of the rim at the point diametrically opposite to that-Where the deformation has been encountered.
• the degree of thrusting force to be applied with the piston 204 of the thruster 4 is suitably metered, making use of the controlling action which the valve 606 is able to have on the fluid filled in the end portion of this branch of the circuit and detecting at the same time the pressure by means of the pressure-gauge 616.
• the pistons 204 and 204' are then retracted and the rim will again undergo a check as to its concentricity.
• the thrusting operations and checks will be repeated until the rim has a degree of concentricity which is within the tolerance limits prescribed by the manufacturer.
• Another important aspect of ⁇ the design of the apparatus according tor the present invention is associated with positioning of the thruster means 4, 4' with respect to the rod 2 which must ⁇ be able to rotate without being subject to influences of any-kind, since, from its rotation with the rim-mounted as shown in Figure 3, it is possible to deduce the data relatingrto the position and the degree of damage to be repaired.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Testing Of Balance (AREA)
• Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
• A Measuring Device Byusing Mechanical Method (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39033358

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Family Cites Families (12)

• 2006
  • 2006-08-09 IT IT000084A patent/ITGE20060084A1/it unknown
• 2007
  • 2007-08-07 CN CN2007800368238A patent/CN101522331B/zh not_active Expired - Fee Related
  • 2007-08-07 EP EP07825995A patent/EP2049278A2/de not_active Withdrawn
  • 2007-08-07 US US12/376,883 patent/US20100175445A1/en not_active Abandoned
  • 2007-08-07 JP JP2009523421A patent/JP2010500215A/ja not_active Ceased
  • 2007-08-07 WO PCT/IB2007/053112 patent/WO2008018022A2/en active Application Filing

Non-Patent Citations (1)

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