Tire uniformity testing device and tire uniformity testing method

A tire uniformity testing method of a tire uniformity testing device including a spindle shaft to which a tire is attachable and a drum mechanism that presses a rotatable drum against the outer periphery of the tire,

• wherein in a case where the drum mechanism reverses the rotation of the tire, the drum is caused to retreat while the contact state between the drum and the tire is maintained, the rotation direction of the tire is switched from the rotation in one direction to the rotation in the other direction, and the drum is caused to advance so that a load is applied to the tire,
• wherein a uniformity waveform is corrected so as to eliminate a shift gradient a. existing in a uniformity waveform measured after the drum mechanism reverses the rotation of the tire, and
• wherein a force variation is obtained from the corrected uniformity waveform.

A tire uniformity testing method that uses a tire uniformity testing device including a drum mechanism that rotatably supports a drum and presses the drum against an outer peripheral surface of a tire attached to a spindle shaft and an air pressure circuit that supplies compressed air to the tire,

• wherein in a case where the drum mechanism reverses the rotation of the tire, the drum is caused to retreat while the contact state between the drum and the tire is maintained, the rotation direction of the tire is switched from the rotation in one direction to the rotation in the other direction, and the drum is caused to advance so that a load is applied to the tire, and
• wherein in a case where the rotation of the tire is reversed from the rotation in one direction to the rotation in the other direction, the inflow of the compressed air into the tire through the air pressure circuit is regulated as the drum retreats, and the regulation of the inflow of the compressed air into the tire is canceled after the drum advances.