CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims the benefit of priority from Japanese Patent Application No. 2018-188135, filed on 3 Oct. 2018, the content of which is incorporated herein by reference.

FIELD

The present invention relates to a tire in which an electronic component is embedded.

BACKGROUND

Conventionally, tires in which an electric component such as RFID is embedded within the rubber structure have been known. With such tires, by an RFID tag embedded in the tire and a reader as an external device carrying out communication, it is possible to perform production control of tires, usage history management, etc. For example, Japanese Unexamined Patent Application, Publication No. 2008-265750 shows a tire in which an electronic component is arranged at the boundary surface of two difference substances. The boundary surface of two substances at which this electronic component is arranged is a surface extending from a free edge of a carcass ply.

SUMMARY

With the technology shown in Patent Document 1, the boundary surface between two substances at which the electronic component is arranged becomes a surface extending from a free edge of the carcass ply; however, at this portion, stress and distortion tends to occur upon the tire deforming. Therefore, the electronic portion arranged at this portion is affected by the stress and distortion upon the tire deforming, and there is a possibility of no longer maintaining the function as an electronic component.

The present invention has been made taking account of the above-mentioned problem, and an object thereof is to provide a tire which can maintain the function of an embedded electronic component, by arranging the electronic component at a position which is hardly affected by the stress and distortion within the tire structure.

A tire (for example, the tire1) according to a first aspect of the present invention includes: a bead core (for example, the bead core21); a bead filler (for example, the bead filler22) which extends to an outer side in a tire-radial direction of the bead core; a carcass ply (for example, the carcass ply23) which extends from the bead core to another bead core and is folded around the bead core; a reinforcement ply (for example, the steel chafer31) disposed so as to cover the carcass ply around the bead core; a first pad (for example, the first pad35) which covers an outer side in a tire-width direction of a folding end (for example, the folding end25A) of the carcass ply which was folded back, at an outer side in the tire-radial direction of an end part (for example, the end part31A) of the reinforcement ply; a second pad (for example, the second pad36) which covers an outer side in the tire-width direction of the first pad; and side wall rubber (for example, the side wall rubber30) which covers at least part of an outer side in the tire-width direction of the second pad, in which an electronic component (for example, the RFID tag40) is provided between the second pad and the side wall rubber.

According to a second aspect of the present invention, in the tire as described in the first aspect, when defining, in a cross-sectional view in the tire-width direction, as a reference distance a distance along a tire-width direction outside surface of the second pad from a tire-radial direction outside end (for example, the tire-radial direction outside end36A of the second pad36) of the second pad until a proximal part (for example, the proximal part36B) of a folding end of the carcass ply which is folded back, the electronic component may be arranged at the tire-width direction outside surface of the second pad within a range until a position 50% of the reference distance from a position of the tire-radial direction outside end of the second pad towards an inner side in the tire-radial direction.

According to a third aspect of the present invention, in the tire as described in the second aspect, the electronic component may be arranged at the tire-width direction outside surface of the second pad within a range from a position 40% of the reference distance until a position 50% of the reference distance from the tire-radial direction outside end of the second pad towards the inner side in the tire-radial direction.

According to a fourth aspect of the present invention, in the tire as described in the first to third aspects, the electronic component may be arranged so that a distance (for example, the distance S) in the tire-width direction between the electronic component and the carcass ply becomes at least the thickness of the carcass ply.

According to a fifth aspect of the present invention, in the tire as described in the first to fourth aspects, the electronic component may be covered by a first rubber sheet (for example, the first rubber sheet431) serving as a protective layer arranged on an inner side in the tire-width direction of the electronic component, and a second rubber sheet (for example, the second rubber sheet432) arranged on an outer side in the tire-width direction of the electronic component; and the first rubber sheet and the second rubber sheet may be configured from rubber having a higher modulus than the side wall rubber, and a lower modulus than the second pad.

According to the present invention, it is possible to provide a tire which can maintain the function of an embedded electronic component, by arranging the electronic component at a position which is hardly affected by the stress and distortion within the tire structure.

