Patent ID: 6810593
Filing Date: 2004-11-02
Classification: F16F,G01B,G01M

Abstract:
A method of reducing an n-order component of a radial run out (RRO) of a wheel rim having a pair of bead seats for tire beads, comprisingmeasuring a radial run out Y1 of one of the bead seats around the wheel rim, measuring a radial run out Y2 of the other bead seat around the wheel rim, finding an average Y of the radial run out Y1 and radial run out Y2 around the wheel rim, obtaining the peak-to-peak amplitude of the n-order component as RRO value X, finding minimum position(s) at which the n-order component becomes minimum and determining deep position(s) P on the wheel rim corresponding to the minimum position(s), determining the length L of a corrective tape as a value within a range of from 0.8 to 1.02 times a length L0, applying a corrective tape to one of or alternatively each of the bead seats at each said deep position P, wherein the corrective tape is made of a synthetic resin and has a thickness t of from 0.1 to 0.5 mm, and said length L0 is defined by the following precision expression (1) or alternatively simplified expression (2) L0=RÏ€Ã—nÃ—arcsin&af;(XtÃ—aÃ—1.3)(1)L0=100Ã—RÃ—X360Ã—tÃ—aÃ—n&it;â€ƒ&it;where&it;â€ƒ&it;0<L0R<0.28(2)whereinL0 is a value in mm, X is a value in mm, n is a positive integer of the order number of the n-order component, t is a value in mm, a is a multiplier which is 0.5 when the corrective tape is applied to one of the bead seats or 1.0 when the corrective tape is applied to both of the bead seats, R is the circumference in mm of the bead seat, pi is the circle ratio (=3.14159 - - - ), and the unit of the argument of arcsine is radian.