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Apparatus and method for determining the profile of the tread of a tire

  • US 5,485,406 A
  • Filed: 07/26/1993
  • Issued: 01/16/1996
  • Est. Priority Date: 01/31/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the profile of a tire tread with distinctive determinations of radii of a crown portion and shoulder portions comprising:

  • a mounting means for mounting the tire about an X axis such that the tire axis is parallel to the X axis;

    a non-contact type Y axis distance measuring means for measuring a Y axis distance from the tire profile thereto and movable along the X axis, the Y axis distance measured being kept as Y data;

    an X axis distance measuring means for measuring an X axis position of the Y axis distance measuring means, the X axis distance being kept as X data, each value of the X data being paired with one value of the Y data;

    a radius calculating means for calculating a radius of at least part of the tire profile based on the paired X data and Y data, said radius calculating means including a sorting means for classifying pairs of the X data and Y data into data classified in point of local portions of the crown portion and shoulder portions of the tire with application of reference data for the tire, and an arithmetic means for determining radii of the respective tire portions by use of the classified data;

    whereinsaid reference data represents data prestored for reference to x axis regions of shoulder portions and the crown portion defining the tire profile, on a basis that a tire equator line is zero on the X axis as datum point,said sorting means includes an end determination means for determining X data on two distal ends of the tire profile by detecting the two X data which exceed predetermined Y data,a center determination means for determining a center point from the X data on two distal ends,means for correcting the measured data with the reference data based so that the measured data as a whole is converted to be based on the datum point for the reference data, and for classifying the measured X and Y data pairs into data classified in point of the crown portion and of the shoulder portions by comparison with reference data on the crown portion and the two shoulder portions; and

    said arithmetic means comprises calculation resources for calculating the radii of the crown portion and the shoulder portions, respectively, with use of the classified data.

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