JP6914129B2 - tire - Google Patents

Description

The present invention relates to a tire.

Conventionally, it has been proposed to install a communication device for transmitting and receiving information using electromagnetic waves inside a tire (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-237398

However, with the above technique, the transmission and reception of electromagnetic waves may not be successful, and the communication device may be separated from the installation location inside the tire.

Therefore, an object of the present invention is to provide a tire capable of improving the transmission / reception sensitivity of electromagnetic waves and suppressing the communication device from peeling off from the installation location.

The gist structure of the present invention is as follows.
The tire of the present invention comprises a belt composed of a plurality of belt layers having a metal cord.
A communication device having an antenna for transmitting and / or receiving information by electromagnetic waves is installed inside the tire.
When the tire is mounted on the applicable rim, the specified internal pressure is filled, and no load is applied, the antenna is
Of the plurality of belt layers, the maximum width belt layer having the maximum width in the tire width direction is located outside the tire width direction from a position 3 cm inward in the tire width direction from the outer end in the tire width direction.
In the tire width direction cross section, when the virtual line passing through the outermost position in the tire radial direction and parallel to the tire width direction is L, the tangent line M at the point P on the tire outer surface is inside in the tire radial direction. The angle θ on the sharp angle side of the tangent line M with respect to the tire width direction is 80 °, which is inclined inward in the tire width direction toward the outside in the tire radial direction. It is characterized by being located.
According to the tire of the present invention, it is possible to improve the transmission / reception sensitivity of electromagnetic waves and prevent the communication device from peeling off from the installation location.

In the present specification, the "applicable rim" is an industrial standard effective in the area where the tire is produced and used. In Japan, JATMA (Japan Automobile Tire Association) JATMA YEAR BOOK, and in Europe, ETRTO (The European). STANDARDS MANUAL of Tire and Rim Technical Organization), YEAR BOOK of TRA (The Tire and Rim Association, Inc.) in the United States, etc. In addition to the current size, the above "applicable rim" also includes a size that may be included in the above industrial standard in the future. "Including in the future." As an example of "possible size", the size described as "FUTURE DEVELOPMENTS" in the STANDARDS MANUAL 2013 edition of ETRTO can be mentioned.) However, if the size is not described in the above industrial standard, the tire A rim with a width corresponding to the bead width. Further, the "specified internal pressure" refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of the tire of the standard such as JATMA in the tire of the applicable size. In the case of a size not described in the above industrial standard, the "specified internal pressure" means the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle equipped with the tire.
Further, with respect to the position of the antenna, "positioned" in a certain range means that at least a part of the antenna is "located" in a certain range.

In the tire of the present invention, the antenna is configured to transmit and / or receive information by an electromagnetic wave having a frequency of 800 to 950 MHz, and is inside the tire width direction from the outer end of the maximum width belt layer in the tire width direction. It is preferable to be located.
According to this configuration, when the antenna transmits / receives information by an electromagnetic wave having a frequency of 800 to 950 MHz, it is possible to further suppress the communication device from being separated from the installation location.

In the tire of the present invention, the antenna is configured to transmit and / or receive information by an electromagnetic wave having a frequency of 12.5-14.0 MHz, and the tire is from the outer end of the maximum width belt layer in the tire width direction. It is preferably located on the outer side in the width direction.
According to this configuration, when the antenna transmits / receives information by an electromagnetic wave having a frequency of 12.5 to 14.0 MHz, the transmission / reception sensitivity of the electromagnetic wave can be further improved.

According to the present invention, it is possible to improve the transmission / reception sensitivity of electromagnetic waves and prevent the communication device from peeling off from the installation location.

It is a cross-sectional view in the tire width direction which shows the one half part in the tire width direction with the tire equatorial plane CL as a boundary of the tire which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the tire of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view in the tire width direction showing one half of the tire according to the embodiment of the present invention in the tire width direction with the tire equatorial plane CL as a boundary. The other half, which is not shown, is the same as the other half, except that the communication device 8 described later is not installed. The tire of the present invention may be asymmetrical with the tire equatorial plane CL as a boundary. FIG. 1 shows a cross section in the tire width direction in a state where the tire 1 is mounted on the applicable rim R, the specified internal pressure is applied, and no load is applied.

As shown in FIG. 1, the tire 1 has a plurality of layers (two layers in the illustrated example) of the belt layer 4a on the outer side in the tire radial direction of the carcass 3 straddling the bead core 2a embedded in the pair of bead portions 2 in a toroidal shape. It includes a belt 4 made of 4b and a tread 5.

In the present embodiment, as shown in FIG. 1, the bead core 2a has a hexagonal cross section, but in the present invention, the cross-sectional shape of the bead core 2a is not particularly limited, and various shapes such as a circular cross section and an octagonal cross section are used. can do. Further, the material of the bead core 2a is not particularly limited, or the bead core 2a may not be provided.

Further, in the present embodiment, the carcass 3 has a main body portion and a folded portion as shown in FIG. 1, and is composed of one carcass ply made of organic fibers. Not limited. Specifically, in the example shown in FIG. 1, the tire radial position at the end of the folded portion of the carcass 3 is located near the maximum tire width portion, but the tire diameter may be inside the tire radial direction. It can also be outside the direction. Alternatively, it may be wound around the bead core 2a. In addition, the number of carcass plies can be two or more. When there are two or more carcass plies and each carcass ply has a folded portion, it is preferable that the positions of the ends of the folded portions in the tire radial direction are different, but the same can be applied.

In the present embodiment, the belt 4 is an inclined belt in which the belt cords formed by coating a metal cord with rubber are crossed with each other at layers (4a and 4b). The metal cord is preferably a steel cord. The number of layers of the belt layer may be two or more. The belt layers 4a and 4b may be a circumferential belt layer formed by rubber-coating a metal cord extending in the tire circumferential direction.

In this embodiment, the tread 5 is composed of one layer of tread rubber. In the present invention, the present invention is not particularly limited to this example, and for example, it can be formed of a plurality of layers of tread rubber such as a cap and base structure.

Here, as shown in FIG. 1, the tire 1 of the present embodiment transmits information to the inside of the tire 1 (in the present embodiment, the inner surface of the tire, more specifically, the inner surface of the inner liner (not shown)) by electromagnetic waves. / Or a communication device 8 including an antenna 6 for receiving and an electronic component 7 having a memory for recording information and the like is installed. In this example, the communication device 8 is installed by adhering the electronic component 7 to the inner surface of the tire with an adhesive.

The antenna 6 transmits and / or receives a radio signal by electromagnetic waves. In this embodiment, the antenna 6 is an RFID antenna. The communication device 8 transmits information such as product management information (for example, serial number and ID number), pressure and temperature inside the tire, and tire usage history from the antenna 6 to a reader (for example, RFID reader) outside the tire. Can be done. The antenna 6 can be formed of a wire made of a metal such as iron, copper, or aluminum. When the antenna 6 receives an electromagnetic wave from an external device (for example, the reader), the communication device 8 is configured to operate by the electric power generated by the electromagnetic wave. According to this, the communication device 8 can be used semi-permanently without replacing the battery or the like.

In this example, the electronic component 7 is connected to the antenna 6 and has a memory for storing predetermined information (including information transmitted and received by the antenna). For example, the electronic component 7 can be coated with a low elasticity resin. As shown in FIG. 1, the antenna 6 is preferably located outside the electronic component 7 in the tire width direction. This is because the sensitivity of transmitting and receiving electromagnetic waves can be improved. The electronic component 7 can also be configured to have the above charging function.

As shown in FIG. 1, the antenna 6 is the maximum width belt layer having the maximum width in the tire width direction among the plurality of belt layers 4a and 4b (in the present embodiment, the belt layer 4a on the inner side in the tire radial direction). It is located on the outer side in the tire width direction from the position 3 cm away from the outer end in the tire width direction on the inner side in the tire width direction.

Further, as shown in FIG. 1, in the cross section in the tire width direction, L is a virtual line that passes through the outermost position in the tire radial direction on the outer surface of the tire and is parallel to the tire width direction. Then, as shown in FIG. 1, the tangent line M at the point on the outer surface of the tire is inclined inward in the tire width direction from the inside in the tire radial direction to the outside in the tire radial direction, and the tangent line M is in the tire width direction (in FIG. 1). Let P be a point where the angle θ on the acute angle side with respect to the line L) is 80 °. At this time, in the present embodiment, the antenna 6 is located outside the tire radial direction with respect to the point P.
Hereinafter, the action and effect of the tire of the present embodiment will be described.

According to the tire of the present embodiment, the tire has two layers of belt layers 4a and 4b having a metal cord, and the belt 4 composed of the belt layers 4a and 4b may interfere with the transmission and reception of electromagnetic waves. Since the antenna 6 is located outside the tire width direction from a position 3 cm inside the tire width direction from the outer end of the maximum width belt layer 4a in the tire width direction, the sensitivity of transmitting and receiving electromagnetic waves can be improved. .. Further, in the present embodiment, since the antenna 6 is located outside the tire radial direction from the above point P, the antenna 6 is installed away from the vicinity of the maximum tire width where the deformation is greatest when the tire is loaded. , It is possible to prevent the communication device 8 from peeling off from the installation location.
As described above, according to the tire of the present embodiment, it is possible to improve the transmission / reception sensitivity of electromagnetic waves and prevent the communication device from peeling off from the installation location.

In the present invention, the antenna 6 is preferably located outside the tire radial direction from the point P'where the angle θ is 70 °, and the antenna 6 is such that the angle θ is 60 °. It is more preferable that the tire is located on the outer side in the radial direction of the tire from the point P ″. This is because the antenna 6 can be installed further away from the vicinity of the maximum width of the tire, which is most deformed when the tire is loaded, and the communication device 8 can be further suppressed from peeling from the installation location.
Further, in the present invention, the antenna 6 is preferably located inside the tire width direction of the maximum width belt layer 4a from the tire width direction outer end from the viewpoint of suppressing the communication device 8 from peeling off from the installation location. .. This is because the centrifugal force generated when the tire rolls acts in the direction of pressing the communication device 8 against the inner surface of the tire.

In the present invention, the antenna 6 is configured to transmit and / or receive information by electromagnetic waves having a frequency of 800 to 950 MHz (for example, 900 MHz band), and has a tire width from the outer end of the maximum width belt layer 4a in the tire width direction. It is preferably located inside the direction.
This is because when the antenna 6 transmits and / or receives information by an electromagnetic wave having a frequency of 800 to 950 MHz (for example, 900 MHz band), it is possible to further suppress the communication device 8 from being separated from the installation location. .. In particular, at the installation position, the centrifugal force generated when the tire rolls acts in the direction of pressing the communication device 8 against the inner surface of the tire, so that the communication device 8 can be effectively suppressed from being separated from the installation location.

In the present invention, the antenna 6 is configured to transmit and / or receive information by an electromagnetic wave having a frequency of 12.5 to 14.0 MHz (for example, 13 MHz band), and is outside the maximum width belt layer 4a in the tire width direction. It is preferably located outside the tire width direction from the end. This is because the above positions do not interfere with the transmission and reception of electromagnetic waves by the belt layers 4a and 4b, and the transmission and reception sensitivity of electromagnetic waves can be further improved.

<Example 1>
In order to confirm the effect of the present invention, a tire having the structure shown in FIG. 1 was prototyped, and the installation position of the antenna 6 (and the installation position of the communication device 8 accordingly) was variously changed from the antenna 6 to the outside of the tire. The average transmission interval of information to the installed RFID reader (the average value of the transmission interval after the start of transmission) was measured. The communication device 8 is configured so that after the RFID reader starts transmitting electromagnetic waves, electric power is stored by the electromagnetic waves, and after the storage, the pressure and temperature information in the tire is transmitted to the RFID reader. The frequency used was the 920 MHz band. The tire was a passenger car tire whose carcass ply was made of an organic fiber cord. The position of the RFID reader was arranged so as to face each installation position of the communication device 8 closest to each other. Table 1 below shows the installation position of the antenna 6 and the results of the average transmission interval. The shorter the average transmission interval, the better the transmission / reception sensitivity.

As shown in Table 1, when the antenna 6 is located outside the tire width direction from a position 3 cm inward in the tire width direction from the outer end in the tire width direction of the maximum width belt layer, the average transmission interval is short and electromagnetic waves are transmitted. It can be seen that the sensitivity of transmission and reception is high.

1: Tire, 2: Bead part, 2a: Bead core,
3: Carcass, 4: Belt, 4a, 4b: Belt layer,
5: Tread, 6: Antenna, 7: Electronic components,
8: Communication device, CL: Tire equatorial plane, L: Tire width direction line, M: Tangent line

Claims (1)

A tire with a belt consisting of multiple belt layers with a metal cord.
A communication device having an antenna for transmitting and / or receiving information by electromagnetic waves is installed inside the tire.
When the tire is mounted on the applicable rim, the specified internal pressure is filled, and no load is applied, the antenna is
Of the plurality of belt layers, the maximum width belt layer having the maximum width in the tire width direction is located outside the tire width direction from a position 3 cm inward in the tire width direction from the outer end in the tire width direction.
In the cross section in the tire width direction, the tangent line M at the point P on the outer surface of the tire is inclined inward in the tire width direction from the inside in the tire radial direction toward the outside in the tire radial direction, and the sharp angle formed by the tangent line M with respect to the tire width direction. It is located outside the tire radial direction from the point P where the side angle θ is 80 ° .
The antenna is configured to transmit and / or receive information by an electromagnetic wave having a frequency of 800 to 950 MHz, and is located inside the tire width direction from the outer end of the maximum width belt layer in the tire width direction. Tires.

Images