Method of correcting uniformity waveform of tire

Patent metadata

Field	Value
Publication number	US-10222300-B2
Application number	US-201314434941-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Nov 12, 2012
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A uniformity waveform for a tire (T) and a rotational phase of a load drum ( 4 ) are measured with a load drum ( 4 ) pressed against the tire (T). In a waveform of the frequency domain acquired by frequency conversion of the uniformity waveform, the amplitude and phase for a component of an integer multiple of the rotational frequency of the load drum ( 4 ) are found and stored as a correction parameter. A corrected tire (T) uniformity waveform is calculated by subtracting from the uniformity waveform a correction waveform calculated on the basis of the correction parameter, the correction waveform being the one in the rotational phase range of the load drum ( 4 ) during tire measurement.

First claim

The invention claimed is:

1. A tire uniformity machine for correcting a uniformity waveform of a tire, at the time when uniformity of the tire is measured while the tire is caused to rotate comprising:
a load drum pressed against the tire to drive to rotate the tire having different in diameter from the load drum;
a rotational phase meter, provided to the load drum, for measuring a rotational phase and frequency of the load drum;
a load cell, provided to the load drum, for measuring a load acting on the load drum; and
a calculation unit having a memory;
the calculation unit configured to:
measure a uniformity waveform of the tire and the rotational phase of the load drum, using the load cell and the rotational phase meter provided to the load drum;
frequency-convert the measured uniformity waveform into a waveform in a frequency domain;
find an amplitude and a phase of a point with a peak amplitude that varies according to the rotational phase of the load drum in a component of an integer multiple of a rotational frequency of the load drum, in a waveform in the converted frequency domain;
store in the memory as a correction parameter the found amplitude and phase in the component of the integer multiple of the rotational frequency of the load drum;
measure the uniformity waveform of the tire and calculating a correction waveform in a range of a rotational phase of the load drum during tire measurement based on the stored correction parameter; and
compute the corrected uniformity waveform of the tire by subtracting the calculated correction waveform from the measured uniformity waveform.

2. The tire uniformity machine according to claim 1 , further comprising a rotation shaft for supporting the drum body, wherein the load cell is provided at the upper and lower ends of the rotation shaft.

Assignees

• Kobe Steel Ltd

Inventors

• Okada Toru
• Sarumaru Shogo

Classifications

• G01M17/022 Primary

  the tyre co-operating with rotatable rolls · CPC title

• G01M17/024

  combined with tyre surface correcting or marking means · CPC title