Method for determining the lifespan of non-pneumatic tires

Abstract

To provide a method for determining the lifespan of non-pneumatic tires, enabling the determination of an appropriate tire replacement time. [Solution] The method for determining the lifespan of a non-pneumatic tire comprises the steps of: obtaining the vertical displacement for a predetermined vertical load on a non-pneumatic tire (S4); and obtaining the rate of change in contact area as the lifespan determination value for a non-pneumatic tire based on the vertical displacement (S16).

Claims

1. A process for obtaining the vertical displacement for a non-pneumatic tire under a predetermined vertical load, A step of obtaining the rate of change in contact area as a value for determining the lifespan of a non-pneumatic tire based on the aforementioned vertical displacement, A method for determining the lifespan of non-pneumatic tires, comprising:

2. A step of determining the drivable distance of the non-pneumatic tire, A step of calculating the vertical displacement at the aforementioned drivable distance, A step of determining the vertical displacement-contact area relationship, which is the relationship between the vertical displacement and the contact area of ​​the aforementioned non-pneumatic tire, The method further comprises a step of calculating the contact area at the traversable distance using the vertical displacement at the traversable distance and the vertical displacement-contact area relationship, The method for determining the service life of a non-pneumatic tire according to claim 1, wherein the step of obtaining the rate of change in contact area is performed based on the initial contact area and the contact area at the drivable distance.

3. The system further includes a step to obtain the distance-vertical displacement relationship, which is the relationship between the distance traveled and the vertical displacement. The method for determining the service life of a non-pneumatic tire according to claim 2, wherein the step of calculating the vertical displacement at the drivable distance is performed based on the drivable distance and the drivable distance-vertical displacement relationship.

4. The system further includes a process to obtain the vertical load-vertical displacement relationship, which is the relationship between vertical load and vertical displacement, by conducting longitudinal stiffness tests at predetermined travel distances. The method for determining the service life of a non-pneumatic tire according to claim 3, wherein the distance traveled - vertical displacement relationship is the relationship between distance traveled and vertical displacement at a predetermined vertical load included in the vertical load - vertical displacement relationship.

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