JP6650833B2 - Laying structure of electric wiring and tire - Google Patents

Description

  The present invention relates to a tire having electric wiring laid on an inner surface thereof and a structure for laying electric wiring laid on an inner surface of the tire.

Conventionally, in a device in which a sensor such as an acceleration sensor or a pressure sensor is attached to the inner surface of a tire and a state of the tire is estimated by analyzing a signal during traveling, an amplifier for amplifying the sensor or the output of the sensor is integrated with a battery. However, due to the problem of battery life, the power may be supplied by a plurality of small generators mounted on the inner surface of the tire (for example, see Patent Document 1).
In general, when mounting a plurality of generators on the inner surface of the tire, the generators, sensors, amplifiers, etc. are arranged in such a manner that the generators are dispersed in the tire circumferential direction so that primary vibrations due to rotation do not occur. A method of connecting electrical devices or electronic devices (hereinafter, referred to as functional components) by electric wiring has been adopted.

  As a method of laying the electric wires on the inner surface of the tire, as shown in FIG. A method can be conceived by sandwiching and attaching a flexible tape having reinforcing fibers oriented in the following manner (hereinafter referred to as reinforcing tapes 3 and 4). In FIG. 1, reference numeral 21 denotes a tire tread portion, reference numeral 22 denotes a belt layer, reference numeral 23 denotes an inner liner portion. It is attached to the inner surface of the inner liner 23 which is the inner surface.

Japanese Patent No. 5571206

By the way, when the tire 2 rotates, the inner surface of the tire 2 on which the electric wiring 1 is laid is similarly deformed, as shown in FIG. Will be repeated.
When a general radial tire is deformed, as shown in FIG. 7 (b), bending deformation occurs around the highly rigid belt layer 22, so that the inner surface (the inner surface) of the tire 2 on which the electric wiring 1 is laid is formed. On the surface of the liner portion 23), a large tensile strain is generated in the tire rotation direction, as indicated by the white arrow in FIG.
When the tire 2 runs, the above-described tensile strain repeatedly acts on the electric wiring 1. Therefore, if the electric wiring 1 is merely sandwiched between the reinforcing tapes 3 and 4 as in the related art, a large tensile strain acting on the electric wiring 1 is generated. It is difficult to reduce it sufficiently, and as a result, there is a problem that the electric wiring 1 is disconnected.

  The present invention has been made in view of the conventional problems, and an object of the present invention is to improve the durability of electric wiring laid on the inner surface of a tire.

The present invention is a structure for laying electric wiring on the inner surface of a tire, wherein, of the electric wiring, at least a surface on the inner surface side of the tire and an opposite surface to the inner surface side of the tire of the electric wiring extending at least in the tire circumferential direction. Either one of the surfaces, or a tape having reinforcing fibers oriented in the tire circumferential direction, respectively, which is bonded to both surfaces, between the tape and the tire inner surface, which are bonded to the inner surface of the tire, or And a vibration absorber such as a foam disposed between the wiring and the inner surface of the tire.
In this way, by inserting the vibration absorber between the electric wiring reinforced with the reinforcing tape and the inner surface of the tire, the strain input applied to the electric wiring from the tire can be reduced, and the durability of the electric wiring is improved. Can be done.
In addition, both ends in the tire circumferential direction of the tape having the reinforcing fibers are extended to the wall surfaces of both ends in the tire circumferential direction of the vibration absorber and the inner surface of the tire, thereby suppressing distortion between the vibration absorber and the tire inner surface. Therefore, the durability of the vibration absorber can be improved. Therefore, the durability of the electric wiring is further improved.
The present invention also relates to a tire in which electric wiring is laid on an inner surface, of the electric wiring, at least a surface of an electric wiring extending in a tire circumferential direction on an inner surface side of the tire and a side opposite to an inner surface side of the tire. Either one of the surfaces, or, respectively, both bonded to the surface, a tape having reinforcing fibers oriented in the tire circumferential direction, between the tape and the tire inner surface bonded to the inner surface side of the tire, Alternatively, a vibration absorber is provided between the electric wiring and the tire inner surface.
Thereby, a tire excellent in durability performance of the electric wiring can be obtained.
In addition, since both ends of the tape having the reinforcing fibers in the tire circumferential direction are extended to the wall surfaces of both ends of the vibration absorber in the tire circumferential direction and the inner surface of the tire, the durability of the electric wiring is further improved. I do.

It is a figure showing the laying structure of the electric wiring concerning this embodiment. It is a figure which shows the circumferential distortion of the wiring body when the thickness of a foam is changed. It is a figure showing other examples of the laying structure of the electric wiring by the present invention. It is a figure showing circumferential direction distortion of a foam. It is a figure which shows the circumferential distortion of a wiring body when a reinforcing tape is extended. It is a figure showing the laying structure of the conventional electric wiring. FIG. 4 is a schematic diagram for explaining a deformed state of a tire during traveling.

FIGS. 1A and 1B show a tire according to the present embodiment and a laying structure 10 of electric wiring laid on the inner surface of the tire, where 1 is electric wiring, 2 is a tire, and 3 is upper reinforcement. The tape 4 is a lower reinforcing tape, and 5 is a foam as a vibration absorber.
1A is the tire circumferential direction, and the vertical direction is the tire radial direction.
The electric wiring 1 may be any of a power supply line, a signal line, and a ground line.
The upper reinforcing tape 3 and the lower reinforcing tape 4 are, for example, flexible tapes having reinforcing fibers oriented in the tire circumferential direction such as butyl tape, and the upper reinforcing tape 3 has an adhesive on the electric wiring 1 side. The lower reinforcing tape 4 is a double-sided tape in which an adhesive is applied to both the electrical wiring 1 side and the foam 5 side. Hereinafter, the electric wiring 1 sandwiched between the upper reinforcing tape 3 and the lower reinforcing tape 4 is referred to as a wiring body 1D.
The foam 5 is fixed to the surface of the inner liner 23 which is the inner surface of the tire 2 with an adhesive or the like. In this example, a foam is used as the vibration absorber, but another vibration absorber such as a rubber plate may be used.
The wiring body 1D is mounted on the foam 5.
That is, the present invention has a structure in which a soft foam layer is interposed between the wiring body 1D and the inner surface of the tire 2 to reduce input from the tire 2 applied to the wiring body 1D.

FIG. 2 shows the wiring body 1D when the wiring body 1D is mounted on a foam 5 having a tire circumferential length L = 200 mm attached to the inner surface of the tire 2 and the tire is repeatedly deformed from a flat state to R300 mm. Is calculated, and the horizontal axis represents the distance (mm) from the center of the foam 5 along the tire circumferential direction.
The dotted line indicates the case where the foam 5 is not provided, the broken line indicates the case where the thickness of the foam 5 is 5 mm, the dashed line indicates the case where the thickness of the foam 5 is 10 mm, and the solid line indicates the case where the thickness of the foam 5 is 15 mm. It is distribution of directional distortion. As can be seen from the figure, when a foam layer is interposed between the wiring body 1D and the inner surface of the tire 2, even if the thickness of the foam body 5 is small, compared to the case where the foam body 5 is not provided, Circumferential strain acting on 1D is greatly reduced.
As described above, by adopting the electric wiring laying structure of the present invention, the circumferential strain acting on the wiring body 1D can be greatly reduced, so that the durability of the electric wiring 1 can be greatly improved. I understand.
When laying the electric wiring on the inner surface of the tire 2, the foam 5 is disposed on the inner surface of the tire, and on the foam 5, the electric wiring 1 is opposite to the inner surface of the tire and the inner surface of the tire. If the reinforcing tapes 3 and 4 are attached to either or both of the side surfaces, a tire having electric wiring with excellent durability can be obtained.

By the way, as shown in FIG. 1, in the structure in which the reinforcing tapes 3 and 4 are arranged only on the upper surface of the foam 5, the circumferential strain acting on the wiring body 1 </ b> D can be reduced. Since a rigid step is generated between the high reinforcing tapes 3 and 4 and the low-rigid foam 5, a large distortion occurs at the interface between the foam 5 and the tire 2 as shown by the broken line in FIG. 4.
Therefore, as shown in FIGS. 3A and 3B, the reinforcing tapes 3 and 4 are extended from the upper surface of the foam 5 along the side surface in the tire circumferential direction, and the end of the reinforcing tapes 3 and 4 is If it is configured to extend to the surface of the inner liner portion 23, which is the inner surface of the tire, the distortion between the foam 5 and the inner surface of the tire can be suppressed.
This is because, in the configuration shown in FIG. 1, the circumferential strain on the inner surface of the tire is transmitted to the wiring body 1D only through the foam 5, whereas the electric wiring shown in FIGS. This is because, in the structures 10A and 10B, not only the rigidity difference does not occur but also the circumferential distortion of the tire inner surface is received by the reinforcing tapes 3 and 4, so that the distortion of the foam 5 is reduced. The cross-sectional shape of the side surface of the foam 5 in the tire circumferential direction may be a substantially vertical shape as shown in FIG. 3A, or may be a slope as shown in FIG. There may be.

FIG. 4 shows the foam 5 when the wiring body 1D is mounted on the foam 5 having a length L = 200 mm in the tire circumferential direction attached to the inner surface of the tire 2 and the tire is repeatedly deformed from a flat state to R300 mm. The distribution of the strain in the circumferential direction at the lower part (near the interface between the foam 5 and the tire 2) is calculated. Is arranged only on the top surface of the foam 5. The long broken line (the thinnest line; Example 2) shows that the side of the foam 5 in the tire circumferential direction shown in FIG. The solid line (intermediate density line; Example 3), in which the tires 3 and 4 extend to the tire inner surface, is shown in FIG. The tapes 3 and 4 are configured to extend to the inner surface of the tire. The thickness of each of the foams 5 was 10 mm.
In this way, when the tire is deformed, as shown in FIGS. 3A and 3B, if the reinforcing tapes 3 and 4 are extended to the inner surface of the tire, circumferential distortion acting on the foam 5 is reduced. Since it can be significantly reduced, the durability of the foam 5 can be improved.

FIG. 5 shows the calculation of the distribution of the circumferential strain acting on the wiring body 1D. A short broken line (Example 1) indicates that the reinforcing tapes 3 and 4 shown in FIG. The long dashed line (Example 2) shown in FIG. 3 shows that the side surface of the foam 5 in the tire circumferential direction is vertical and the reinforcing tapes 3 and 4 extend to the tire inner surface shown in FIG. The configuration and the solid line (Example 3) are the configuration shown in FIG. 3B in which the side surface of the foam 5 in the tire circumferential direction is a slope, and the reinforcing tapes 3 and 4 extend to the tire inner surface. .
As can be seen from the figure, there is no significant difference in the circumferential strain acting on the wiring body 1D between the configuration shown in FIG. 1 and the configurations shown in FIGS. That is, even if the durability performance of the foam 5 is improved, the circumferential strain acting on the wiring body 1D does not increase. Therefore, with the configuration shown in FIGS. 3A and 3B, both the durability of the electric wiring 1 and the durability of the foam 5 can be improved.

表１から明らかなように、従来例では、図６に示すＡ点（中央部付近）で電気配線が完全に断線していた。
また、実施例１では、電気配線の断線はなかったものの、図１に示すＢ点（発泡体とタイヤとの界面近傍）で発泡体が破断した。
これに対して、実施例２，３では、電気配線の断線も発泡体の破断もなかった。
これにより、配線体１Ｄとタイヤ内面との間に発泡体５を介在させることで、電気配線の耐久性能が向上することが確認された。
また、補強テープ３，４をタイヤ内面まで延長する構成とすれば、電気配線１の耐久性能と発泡体５の耐久性能がともに向上することも確認された。 [Example]
The configuration of the conventional example shown in FIG. 6, the first embodiment of the present invention shown in FIG. 1, the second embodiment shown in FIG. 3A, and the third embodiment shown in FIG. The results of the durability test are shown in Table 1 below.
The tire size of each test tire is 225 / 60R17.
In the endurance test, the electrical wiring after running 10,000 km at a load of 620 kgf and air pressure of 100 kPa, and the disconnected state of the foam were examined.

As is clear from Table 1, in the conventional example, the electrical wiring was completely disconnected at point A (near the center) shown in FIG.
Further, in Example 1, although there was no disconnection of the electric wiring, the foam broke at the point B (near the interface between the foam and the tire) shown in FIG.
In contrast, in Examples 2 and 3, there was no disconnection of the electric wiring and no breakage of the foam.
Thereby, it was confirmed that the durability of the electric wiring was improved by interposing the foam 5 between the wiring body 1D and the tire inner surface.
In addition, it was also confirmed that when the reinforcing tapes 3 and 4 were configured to extend to the inner surface of the tire, both the durability of the electric wiring 1 and the durability of the foam 5 were improved.

  As described above, the present invention has been described using the embodiment and the examples, but the technical scope of the present invention is not limited to the scope described in the above embodiment. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiment. It is apparent from the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

1 electric wiring, 1D wiring body, 2 tires,
10, 10A, 10B Electrical wiring laying structure 21 Tire tread portion, 22 belt layer, 23 inner liner portion,
3, 4 Reinforcement tape, 5 foam.

Claims (4)

An electric wiring laying structure on the inner surface of the tire,
Tire bonded to one or both of the inner surface of the tire and the surface opposite to the inner surface of the tire of the electric wiring extending at least in the tire circumferential direction, of the electric wiring, respectively, A tape having reinforcing fibers oriented in the circumferential direction,
Between the tape and the tire inner surface adhered to the inner surface of the tire, or,
An electric wiring laying structure, comprising: a vibration absorber disposed between the electric wiring and an inner surface of the tire.   2. The electric wiring according to claim 1, wherein both ends of the tape having the reinforcing fibers in the tire circumferential direction extend to wall surfaces of both ends of the vibration absorber in the tire circumferential direction and an inner surface of the tire. 3. Laying structure. A tire with electric wiring laid on the inner surface,
Tire bonded to one or both of the inner surface of the tire and the surface opposite to the inner surface of the tire of the electric wiring extending at least in the tire circumferential direction, of the electric wiring, respectively, A tape having reinforcing fibers oriented in the circumferential direction,
Between the tape and the tire inner surface adhered to the inner surface of the tire, or,
A tire comprising: a vibration absorber disposed between the electric wiring and an inner surface of the tire.   The tire according to claim 3, wherein both ends of the tape having the reinforcing fibers in the tire circumferential direction are extended to wall surfaces of both ends of the vibration absorber in the tire circumferential direction and an inner surface of the tire.

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