JP6650834B2 - Mounting structure of functional parts and tire - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire having a functional component mounted on an inner surface thereof and a mounting structure of the functional component mounted on the inner surface of the tire, and more particularly to an improvement in durability of the functional component and electric wiring connected to the functional component.

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.
By the way, as shown in FIG. 4, when the functional component 1 and the electric wiring 2 are mounted on the inner surface of the tire 3, a vibration absorber such as a foam is attached to the inner surface of the tire 3. A flexible tape (hereinafter, referred to as butyl tape) having reinforcing fibers oriented in the tire circumferential direction, such as butyl tape, is mounted on the vibration absorber 4 from the tire inner surface side and the opposite side to the tire inner surface side. A method of alleviating the deformation of the tire 3 by the vibration absorber 4 can be considered by mounting the functional component 1 and the electric wiring 2 which are sandwiched and reinforced by the reinforcing tapes 5 and 6).

Japanese Patent No. 5571206

However, when the inner surface of the tire is deformed in the circumferential direction when the tire 3 is deformed, the reinforcing tapes 5 and 6 near the electric wiring 2 extend uniformly in the circumferential direction, but since the functional component 1 has high rigidity, it is directly below the functional component 1. In such a case, the reinforcing tapes 5 and 6 cannot be deformed, and as a result, a large strain is concentrated on both ends of the functional component 1, and the reinforcing tapes 5 and 6 may be broken.
When the reinforcing tapes 5 and 6 break, the reinforcing effect of the reinforcing tapes 5 and 6 on the electric wiring 2 is lost, and there is a problem that the electric wiring 2 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 a functional component attached to an inner surface of a tire and electric wiring connected to the functional component.

The present invention relates to a mounting structure of a functional component mounted on an inner surface of a tire, wherein the functional component and at least an electrical wiring extending in a tire circumferential direction among electrical wires connected to the functional component are arranged in a tire circumferential direction. By the reinforcing tape having oriented reinforcing fibers, the vibration absorber is sandwiched between the inner surface side of the tire and the inner surface side of the tire from the opposite side, and the reinforcing tape on the inner surface side of the tire and the inner surface of the tire. The functional component is inserted, and is attached to an end of the vibration absorber with respect to a center of the vibration absorber.
Thereby, since the distortion generated at both ends of the functional component can be reduced, disconnection of the electric wiring connected to the functional component can be prevented, and the durability of the functional component and the electric wiring can be improved.
Further, the distance between the mounting position of the functional component and the end of the vibration absorber is set to 以下 or less of the length of the vibration absorber along the tire circumferential direction. Performance was further improved.
Further, the present invention provides a tire having a functional component mounted on an inner surface thereof, wherein the functional component and an electrical wiring connected to the functional component extending at least in a circumferential direction of the tire include an inner surface of the tire. Two reinforcing tapes having reinforcing fibers oriented in the circumferential direction of the tire, respectively sandwiched from a side of the tire and a side opposite to the inner surface side of the tire, a reinforcing tape on the inner surface side of the tire among the reinforcing tapes, and the tire And a vibration absorber inserted between the vibration absorber and the inner surface of the vibration absorber, wherein the functional component is attached to an end of the vibration absorber with respect to a center of the vibration absorber.
Thereby, a tire excellent in durability performance of functional components and electric wiring can be obtained.
Further, the distance between the mounting position of the functional component and the end of the vibration absorber is set to 以下 or less of the length of the vibration absorber along the tire circumferential direction. The performance is further improved.

It is a figure showing the attachment structure of the functional parts concerning an embodiment of the invention. It is a figure which shows the circumferential distortion of a reinforcing tape when a functional component is attached to the center of a foam. FIG. 4 is a diagram illustrating a relationship between a mounting position of a functional component and a circumferential strain of a reinforcing tape. It is a figure which shows the mounting structure of the conventional functional component.

FIG. 1 is a diagram showing a tire according to an embodiment of the present invention and a mounting structure 10 for a functional component mounted on the inner surface of the tire, wherein 1A and 1B are functional components, 2 is electric wiring, 3 is a tire, 4 Is a vibration absorber, 5 is an upper reinforcing tape, and 6 is a lower reinforcing tape.
The left-right direction in the figure is the tire circumferential direction, and the up-down direction is the tire radial direction.
In this example, the functional component 1A is a connector, the functional component 1B is an amplifier for amplifying the output of a sensor (not shown), and the electric wiring 2 is a signal line. The functional components 1A and 1B may be other functional components such as an AD converter and a transmitter. Further, a power supply line or a ground line as the electric wiring 2 may be used.
The vibration absorber 4 is fixed to the inner liner 31 that is the inner surface of the tire 3 with an adhesive or the like. In this example, a foam is used as the vibration absorber 4, but another vibration absorber such as a rubber plate may be used.
The upper reinforcing tape 5 and the lower reinforcing tape 6 are, for example, flexible tapes having reinforcing fibers oriented in the tire circumferential direction such as a butyl tape. The lower reinforcing tape 6 is a double-sided tape in which an adhesive is applied to the connectors 1A and 1B and both the electrical wiring 2 and the vibration absorber 4 side.
That is, the functional components 1A and 1B and the electric wiring 2 are sandwiched by the upper reinforcing tape 5 and the lower reinforcing tape 6 from the inner surface side (the inner liner 31 side) of the tire 3 and the opposite side to the inner surface side of the tire. Thus, it is mounted on the vibration absorber 4.
Further, in this example, as shown in FIG. 1, when the length of the vibration absorber 4 in the tire circumferential direction is L, the mounting position of the functional component 1A and one end of the vibration absorber 4 (the functional component 1A) is the distance D _a between the end portion) 1A of the attached side, and a distance D _B of the mounting position of the functional parts 1B and the other end of the vibration absorbing member 4, respectively, and L / 4 or less .

Next, the relationship between the mounting positions of the functional components 1A and 1B and the circumferential strain of the upper and lower reinforcing tapes 5 and 6 will be described.
The dashed line in FIG. 2 indicates that the electric wiring sandwiched by the butyl tape is laid on the foam having a length L = 200 mm, and the circumferential strain near the electric wiring of the butyl tape when the tire is deformed from a flat state to R300 mm. It is calculated. As described above, in the case of only the electric wiring, the distortion increases at the central portion. However, as shown in FIG. 4, when a rigid functional component (height: 15 mm) is attached to the central portion, the solid line in FIG. As shown, large strains are concentrated on both ends of the functional component 1.
Accordingly, the butyl tape, which is the wiring reinforcing member, is easily broken due to repeated deformation of the tire, and the durability of the wiring portion may be reduced.
FIG. 3 shows a distance D of 20 mm (L / 10), 40 mm (2 L / 10), and 60 mm (3 L / 10) from the distance D between the mounting position of the functional components 1A and 1B and the end of the foam, respectively. The circumferential strain near the electrical wiring of the butyl tape when one functional component is attached to each position is calculated. The thick solid line is D = L / 10, the thin solid line is D = 2L / 10, and the dashed line is D. = 3 L / 10. Note that the broken line in the figure is the calculation result when the functional component is attached to the center.
As is clear from the figure, when the functional components 1A, 1B are mounted on both ends 4A, 4B side of the center of the foam (vibration absorber 4), they are generated at both ends of the functional components 1A, 1B. It can be seen that the circumferential strain of the butyl tape becomes smaller as the distance D between the mounting position of the functional components 1A and 1B and the end of the foam becomes smaller.
Therefore, when mounting the functional components 1A and 1B on the inner surface of the tire 3, the vibration absorber 4 is attached to the inner surface of the tire, and the functional components 1A and 1B and the electric wiring 2 are mounted on the vibration absorber 4. The functional components 1A and 1B are sandwiched between the inner surfaces of the tire 3 and the opposite side of the tire with the reinforcing tapes 5 and 6, and the functional components 1A and 1B are located at the ends of the vibration absorber 4 more than the center of the vibration absorber 4. If it is attached to the side, the durability of the functional components 1A and 1B and the electric wiring 2 can be improved.
In addition, the smaller the circumferential strain of the butyl tape (reinforcing tapes 5, 6), the higher the durability of the wiring portion. Therefore, the distance D between the mounting position of the functional component and the end of the foam is D ≦ L / 4. It is more preferable to set it to about L / 10.

表１から明らかなように、従来例では、中央の機能部品付近で電気配線が完全に断線していた。
これに対して、実施例１では、機能部品も電気配線も破損しなかった。また、実施例２では、機能部品付近で補強テープの切断が見られたが、電気配線の断線はなかった。
一方、比較例では、機能部品付近で補強テープが切断し、電気配線に亀裂が発生した。
これにより、機能部品の取付位置と振動吸収体の端部との距離Ｄを振動吸収体のタイヤ周方向に沿った長さＬの１/４以下とすることが確認された。また、Ｄ＝Ｌ/１０とすれば、電気配線と電気配線を補強する補強テープの両方の耐久性が向上することが確認された。 [Example]
A foam is attached to the inner surface of the test tire, and a functional component and an electric wiring sandwiched by a reinforcing tape are attached on the foam from the inner surface side of the tire and the opposite side to the inner surface side of the tire. Table 1 below shows the results of the performance check.
In the first embodiment, one functional component is attached to each 20 mm (L / 10) position from both ends of the foam, and in the second embodiment, the functional component is attached to both ends of the foam. , 40 mm (2 L / 10).
In the conventional example, one functional component is attached to the center of the foam, and in the comparative example, one functional component is attached to each of 60 mm (3 L / 10) positions from both ends of the foam. It is something.
The tire size of each test tire is 225 / 60R17.
In the endurance performance test, the state of disconnection of the electric wiring after traveling 10,000 km under a load of 620 kgf and an air pressure of 100 kPa was examined.

As is clear from Table 1, in the conventional example, the electric wiring was completely disconnected near the central functional component.
In contrast, in Example 1, neither the functional component nor the electrical wiring was damaged. In Example 2, the cutting of the reinforcing tape was observed near the functional component, but there was no disconnection of the electric wiring.
On the other hand, in the comparative example, the reinforcing tape was cut in the vicinity of the functional component, and cracks occurred in the electric wiring.
Thereby, it was confirmed that the distance D between the mounting position of the functional component and the end of the vibration absorber was 以下 or less of the length L of the vibration absorber along the tire circumferential direction. Further, it was confirmed that when D = L / 10, the durability of both the electric wiring and the reinforcing tape for reinforcing the electric wiring was 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.

For example, in the above embodiment, the distance between the functional component 1A and one end 4A of the vibration absorber 4 and the distance between the functional component 1B and the other end 4B of the vibration absorber 4 are the same length. It may be different.
Further, in the above-described embodiment, the functional component is attached to both ends of the vibration absorber. However, the functional component may be attached to only one side, or a dummy component that is not connected to the electric wiring may be attached to the other end.
In any case, it is important that the distance D between the mounting position of the functional component and the end of the vibration absorber is not more than 1/4 of the length L of the vibration absorber along the tire circumferential direction. The durability of the functional component having the electric wiring can be improved.

1, 1A, 1B functional parts, 2 electric wiring, 3 tires, 31 inner liner,
4 Vibration absorber, 5,6 reinforcing tape.

Claims (4)

A mounting structure for a functional component mounted on the inner surface of the tire,
The electrical wiring extending at least in the tire circumferential direction of the functional component and the electrical wiring connected to the functional component,
By a reinforcing tape having reinforcing fibers oriented in the tire circumferential direction, the inner surface side of the tire and the inner surface side of the tire are sandwiched from opposite sides,
A vibration absorber is inserted between the reinforcing tape on the inner surface side of the tire and the inner surface of the tire,
The mounting structure for a functional component, wherein the functional component is mounted closer to an end of the vibration absorber than a center of the vibration absorber.   The distance between the mounting position of the functional component and the end of the vibration absorber is not more than 1/4 of the length of the vibration absorber along the tire circumferential direction. Mounting structure for functional parts. A tire having a functional component attached to an inner surface thereof,
A tire peripheral part that sandwiches at least the electrical wiring extending in the tire circumferential direction of the functional component and the electrical wiring connected to the functional component from an inner surface side of the tire and a side opposite to the inner surface side of the tire. Two reinforcing tapes having reinforcing fibers oriented in directions,
A vibration absorber inserted between the reinforcing tape on the inner surface side of the tire and the inner surface of the tire of the reinforcing tape,
The tire, wherein the functional component is attached to an end of the vibration absorber with respect to a center of the vibration absorber.   The distance between the mounting position of the functional component and the end of the vibration absorber is not more than 1/4 of the length of the vibration absorber along the tire circumferential direction. tire.

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