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Method of correcting variations in radial force between a tire and the ground

  • US 5,060,510 A
  • Filed: 06/20/1990
  • Issued: 10/29/1991
  • Est. Priority Date: 06/30/1989
  • Status: Expired due to Term
First Claim
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1. A method of correcting defects in uniformity of a tire mounted on a rim the rim flanges of which have a portion perpendicular to the axis of rotation, which includes rolling the tire mounted , inflated and under load on the drum of a uniformity machine, graphically recording the variation in radial force of the rolling assembly consisting of tire and rim, and removing the tire from its rim, characterized by the fact that:

  • the variation in radial force (FR) is broken down into its harmonics of the 1st to 16th order;

    the variations in the harmonics are checked with respect to control limits which are not to be exceeded;

    a variation of radial force (FRn) which takes into account the harmonic of the highest order which it is necessary to correct and all harmonics of lower order is recomposed;

    the amplitude of the variation (FRn) thus obtained is determined as well as the circumferential positions of the optimums (maximum FM and minimum Fm) of this variation (FRn); and

    by placing, between the vertical walls (23) of the rim flanges (20) and the corresponding walls of the beads (12) on each side of the tire (1), a compensation wedge (30) in the form of a circular ring, the outside radius (R1) of which is at least equal to the radius (RT) of the point of tangency (T) between the upper rounded portion (24) and the vertical wall (23) of the flange of the rim (20), the inner radius (R2) of which is at most equal to the radius (RS) of the point of tangency (S) between the vertical wall (23) and the lower rounded portion (22) of the flange of the rim and the thickness (e) of which is constant radially over the height (H), and variable circumferentially between a maximum value (eM) at the level of the maximum value (FM) of the variation in radial force (FRn) and substantially proportional to the amplitude (A) of the variation (FRn) and a minimum value (em) of 0.3 mm at the level of the minimum value (Fm) of the variation (FRn), the value of the thickness (e) between these two extremes (eM) and (em) for the point of the wedge (30) corresponding to the value (F) of the radial force measured being such that the quantity e-0.3 in mm is proportional to the quantity F-Fm, the compensation wedge being made of a plastic or elastomeric simple or composite material of a density of at most 1.2.

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