Toyo Tire Rubber Co., Ltd.

Kinya Moriguchi

Osamu Yamashita

Hajime Watanabe

Toru Ishitsuka

An inspection method for inspecting beads provided on a tire building drum in process of production a pneumatic tire includes measuring a displacement amount in a radial direction on each of the beads lying axially on both sides of the drum with a distance sensor such as an eddy current sensor while rotating the drum, synthesizing displacement amounts so obtained on the beads on both the sides, calculating a harmonic of the displacement amounts in the radial direction of the beads by performing harmonic analysis on a resultant synthesized displacement amount, and determining whether the magnitude of the harmonic so calculated falls within a predetermined range.

Method and apparatus for inspecting pneumatic tire during production

In order to reduce the second harmonic of tangential force variation (TFV) of tire constituting one of factors of vibration in high speed running of a vehicle, a tire is rotated at a vibration generating speed and phase and amplitude of the second harmonic of TFV are measured and mass members M are provided or eliminated at two locations opposed to each other in the diameter direction on a circumference of the tire such that the measured second harmonic of TFV is canceled by the second harmonic of TFV caused by providing or eliminating the masses.

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Osaka, Japan

Kinya Moriguchi