Tire inspection device and tire posture detection method

1. A tire inspection device, comprising:

a support portion which supports a tire such that a center axis of the tire is positioned along a vertical direction;

a lifting and lowering portion which moves the tire and a rim relative to each other in the vertical direction to fit the rim to the tire;

a position detection unit which detects a position of a surface of the tire in the vertical direction at three or more detection points; and

a posture detection unit which detects posture information of the tire based on position information detected by the position detection unit,

wherein the position detection unit is integrally provided with the support portion, and

wherein the posture detection unit includes:

a difference calculation unit which calculates a difference of the position information for each detection point before and after relative movement between the tire and the rim; and

a determination unit which compares the difference for each detection point and a predetermined reference value with each other, determines that the tire is in a normal posture in a case where the difference is smaller than the reference value and generates a normal signal as the posture information, and determines that the tire is in an abnormal posture in a case where the difference is greater than the reference value and generates an abnormal signal as the posture information.

2. The tire inspection device according to claim 1 ,

wherein the position detection unit is provided in a region on one side in the center axis direction of the tire, and detects the position information in a state where the position detection unit does not come into contact with the detection point.

3. The tire inspection device according to claim 1 ,

wherein when viewed from the vertical direction, the position detection unit is provided at a position which is positioned inside an outer circumferential edge of the tire and outside an outer circumferential edge of the rim, and

wherein the detection point is positioned on a side wall which is a surface facing the center axis direction in the tire.

4. A tire inspection device, comprising:

a support portion which supports a tire such that a center axis of the tire is positioned along a vertical direction;

a lifting and lowering portion which moves the tire and a rim relative to each other in the vertical direction to fit the rim to the tire;

a position detection unit which detects a position of a surface of the tire in the vertical direction at three or more detection points; and

a posture detection unit which detects posture information of the tire based on position information detected by the position detection unit,

wherein the position detection unit is fixed at a position which is separated from the support portion and is different from the position of the support portion, and

wherein the posture detection unit includes:

a difference calculation unit which calculates a difference of the position information for each detection point before and after relative movement between the tire and the rim; and

a determination unit which compares the difference for each detection point and a predetermined reference value with each other, determines that the tire is in a normal posture in a case where the difference is smaller than the reference value and generates a normal signal as the posture information, and determines that the tire is in an abnormal posture in a case where the difference is greater than the reference value and generates an abnormal signal as the posture information.

5. A tire posture detection method, which detects a posture change of a tire when the tire supported by a support portion such that a center axis of the tire is positioned along a vertical direction, and a rim fitted to the tire move relative to each other in the vertical direction, by a position detection unit which is provided integrally with the support portion, comprising:

a step of detecting a plurality of position information by detecting a separation distance between the tire and the position detection unit during the relative movement at three or more detection points on the tire;

a step of calculating a difference between the plurality of position information for each detection point before and after the relative movement; and

a step of comparing the difference for each detection point and a predetermined reference value with each other, determining that the tire is in a normal posture in a case where the difference is smaller than the reference value, and determining that the tire is in an abnormal posture in a case where the difference is greater than the reference value.

6. A tire posture detection method, which detects a posture change of a tire when the tire supported by a support portion such that a center axis of the tire is positioned along a vertical direction, and a rim fitted to the tire move relative to each other in the vertical direction, by a position detection unit which is provided at a position which is separated from the support portion and is different from the position of the support portion, comprising:

a step of detecting a plurality of position information by detecting a separation distance between the tire and the position detection unit during the relative movement at three or more detection points on the tire;

a step of calculating a difference between the plurality of position information for each detection point before and after the relative movement; and

a step of comparing the difference for each detection point and a predetermined reference value with each other, determining that the tire is in a normal posture in a case where the difference is smaller than the reference value, and determining that the tire is in an abnormal posture in a case where the difference is greater than the reference value.