JP2000108619A - Auxiliary part for tire transponder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a transponder in a desired burying depth so as to prevent a communication failure by radio interference by providing a holding part for fitting the transponder and a thick part for regulating the burying depth of the transponder. SOLUTION: A rubber-made auxiliary part 1 is provided with a groove-like holding part 1a formed so as to be fitted to a cylindrical transponder and a thick part 1b for regulating the burying depth of the transponder, which has a thickness (t). When the transponder is buried in a tire by use of this auxiliary part 1, the transponder is laid in the state where it is fitted in the holding part 1a of the auxiliary part 1, and buried to an unvulcanized rubber member constituting the tire so that the thick part 1b of the transponder auxiliary part 1 is outside, whereby, the burying depth of the transponder can be easily set on the basis of the thickness (t) of the thick part 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber auxiliary component suitable for embedding a transponder in a heavy-duty pneumatic radial tire, and more particularly, to preventing a communication failure due to radio wave interference of a metal component. The present invention relates to an auxiliary part of a transponder for a tire, which makes it possible to easily install a transponder at a desired embedding depth.

[0002]

2. Description of the Related Art In recent years, a technology for mounting a transponder having a built-in memory on a tire has been actively developed for the purpose of manufacturing management, shipping management, and use history management after the tire has been handed to a user. I have. Many prior arts attach a transponder to the inner surface of the tire, but this method not only deteriorates the appearance of the inner surface of the tire, but also increases the distance to the interrogator that communicates from the outside of the tire. Failure may occur.
Therefore, it is desirable that the transponder be buried inside the tire.

When a transponder is embedded in a heavy-duty pneumatic radial tire, it is preferable to install the transponder in the bead portion in consideration of the durability of the transponder and the durability of the tire. However, in pneumatic radial tires for heavy loads, many metal parts are used as components of the bead portion. If these metal parts and the transponder are close to each other, radio interference occurs and communication becomes impossible. . Therefore, when embedding the transponder inside the tire, it is necessary to appropriately set the embedding depth of the transponder so that communication failure due to radio wave interference of the metal component does not occur.

On the other hand, as a method of embedding a transponder in an unvulcanized tire, for example, it is possible to manually embed a transponder in advance in an unvulcanized bead filler. However, in this case, it is extremely difficult to embed the transponder so as to secure a predetermined distance with respect to the metal component forming the bead portion.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a transponder for a tire which can easily be installed at a desired embedding depth so as to prevent a communication failure due to radio wave interference of a metal part. To provide parts.

[0006]

An auxiliary component of a transponder for a tire according to the present invention for achieving the above object is an auxiliary component made of a rubber composition for embedding a transponder in a tire. It is characterized in that a holding portion to be fitted and a thick portion for defining an embedding depth of the transponder are provided.

In the present invention, when the transponder is embedded in the tire, the transponder is embedded in a state where the transponder is fitted in the holding portion of the auxiliary component, and the embedding depth of the transponder is determined based on the thickness of the thick portion. Can be easily set, and the distance between the metal component constituting the tire and the transponder can be forcibly secured. Therefore, if the thickness of the thick portion is set to 2.0 mm or more, communication failure of the transponder due to radio wave interference of the metal component can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 illustrates an auxiliary part of a transponder for a tire according to an embodiment of the present invention. In FIG. 1, a rubber auxiliary component 1 has a groove-shaped holding portion 1a into which a columnar transponder (not shown) is fitted, and a thick portion 1b having a thickness t defining the embedding depth of the transponder. And

The sectional shape of the auxiliary component 1 is not particularly limited, and can be variously shaped. For example, as shown in FIG. 2A, a holding portion 1a in which more than half the circumference of the columnar transponder is fitted is provided.
As shown in FIG. 2 (b), a holding portion 1a which fits less than half the circumference of the columnar transponder is provided. As shown in FIG. 2 (c), the holding portion 1a is provided on the side of the auxiliary component 1.
As shown in (d), the auxiliary component 1 may be formed in a cylindrical shape, and a cylindrical holding portion 1a in which a columnar transponder is fitted may be provided at the center. If the cross-sectional shape of the transponder is non-circular, the cross-sectional shape of the holding portion 1a can be changed accordingly.

When the transponder is embedded in the tire using the auxiliary part 1, the transponder is fitted in the holding portion 1a of the auxiliary part 1, and the transponder is mounted on an unvulcanized rubber member constituting the tire. By embedding the thick part 1b of the auxiliary component 1 so as to be on the outside, the embedding depth of the transponder can be easily set based on the thickness t of the thick part 1b. Therefore, even when the metal component is arranged adjacent to the rubber member, the distance between the metal component and the transponder can be forcibly secured based on the thickness t of the thick portion 1b.

Preferably, the thickness t of the thick portion 1b is 2.0 mm or more. By setting the thickness t of the thick portion 1b to 2.0 mm or more, it is possible to prevent communication failure of the transponder due to radio wave interference of the metal component. However, if the transponder is too far from the metal parts, the rubber deformation during running of the rubber becomes large and the transponder is easily damaged, so the upper limit of the thickness t is preferably set to 6.0 mm.

The rubber composition constituting the auxiliary part 1 may be in an unvulcanized state, a semi-vulcanized state, or a vulcanized state.
This rubber composition is preferably the same as or similar to the tire rubber composition at the transponder embedding position. Thus, by making the rubber composition of the auxiliary part 1 substantially the same as the tire rubber composition, even if the auxiliary part 1 is added, the tire performance and the tire durability do not decrease.

Further, in order to protect the transponder, it is preferable to use a hard rubber composition as the constituent material of the auxiliary part 1, and the JIS-A in a vulcanized state thereof is used.
The hardness is preferably in the range of 60 to 85. By forming the auxiliary component 1 from the hard rubber composition in this way, even when a glass-encapsulated transponder that is inexpensive but easily breakable is embedded, the transponder can be reliably prevented from being damaged.

FIGS. 3 to 5 each show a pneumatic radial tire for heavy loads in which a transponder is embedded in a bead portion using the transponder auxiliary component of the present invention. 3 to 5, an annular bead core 12 is disposed in the bead portion 11. This bead core 12
Is made of steel and has, for example, a structure in which a steel wire is wound a plurality of times. A bead filler 13 made of hard rubber is arranged on the outer circumference of the bead core 12. The bead filler 13 has a two-layer structure in which a rubber layer having a higher hardness is disposed on the inner side in the tire radial direction, and a rubber layer having a lower hardness is disposed on the outer side in the tire radial direction. However, the bead filler 13 may have a single-layer structure composed of one type of rubber layer. The hardness of filler rubber is JIS-A
The hardness is preferably in the range of 65 to 85.

A carcass layer 14 in which a plurality of steel cords are arranged in the tire radial direction is mounted between the pair of left and right bead portions 11, 11, and an end of the carcass layer 14 surrounds the bead core 12. It is wound up from the inside of the tire to the outside. The bead portion 11 is provided with a steel reinforcing material 15 made of a plurality of steel cords.
4 is wrapped around the bead core 12 so as to enclose it.

In the pneumatic radial tire for heavy loads, a columnar transponder T is embedded in the bead filler 3 so that its longitudinal direction is oriented in the tire circumferential direction. The transponder T is of a glass sealed type in which components such as an antenna, a memory, and a communication circuit are sealed in a glass tube. Transponders are passive devices that do not have their own source of electrical energy, but instead use the interrogation signal emitted from an external energy source as the source of electrical energy to transmit certain data. It has become. As the transponder, there are a read-only type in which data in the memory cannot be rewritten and a read / write type in which data in the memory can be read and written.

In FIG. 3, the transponder T is arranged at a position near the main body side of the carcass layer 14. The position of the transponder T is defined by the auxiliary component 1 embedded in the inner surface of the bead filler 13 together with the transponder T. That is, the thickness t of the thick portion 1b of the auxiliary component 1 is 2 mm or more, and the transponder T is 2 mm from the metal component (carcass layer 14) constituting the bead portion 11.
It is arranged at a position separated by the above distance.

In FIG. 4, the transponder T is arranged at a position near the winding end side of the carcass layer 14.
The position of the transponder T is defined by the auxiliary component 1 embedded in the outer surface of the bead filler 13 together with the transponder T. That is, the thick part 1 of the auxiliary part 1
The thickness t of b is 2 mm or more, and the transponder T is arranged at a position separated by a distance of 2 mm or more from the metal component (carcass layer 14) constituting the bead portion 11.

In FIG. 5, the transponder T is disposed at a position near the bead core 12. The position of the transponder T is defined by the auxiliary component 1 embedded in the bottom surface of the bead filler 13 together with the transponder T. That is, the thickness t of the thick portion 1b of the auxiliary component 1 is 2 m.
m, and the transponder T is disposed at a position separated by a distance of 2 mm or more from the metal component (bead core 12) constituting the bead portion 11.

By arranging the transponder T at a distance of 2 mm or more from the metal parts forming the bead portion 11 as described above, it is possible to prevent communication failure of the transponder T due to radio wave interference of these metal parts. it can. Moreover, since the transponder T is provided in the bead portion 11, the durability of the transponder T and the durability of the tire itself can be maintained well. In addition,
In each of the above embodiments, it is preferable that the rubber composition constituting the auxiliary component 1 be substantially the same as the rubber composition of the adjacent bead filler 13.

FIG. 6 illustrates a pneumatic radial tire for heavy loads in which a transponder is embedded in a tread using the transponder auxiliary part of the present invention. FIG.
In the tread portion 16, on the outer peripheral side of the carcass layer 14, a plurality of belt layers 17 made of a plurality of steel cords are arranged over one circumference of the tire. These belt layers 17 are arranged such that their reinforcing cords are inclined with respect to the tire circumferential direction, and the reinforcing coats intersect each other between the layers. The tread portion 16 is provided with a plurality of main grooves 18 extending in the tire circumferential direction.

In the heavy duty pneumatic radial tire described above, a columnar glass-filled transponder T is embedded in the tread rubber of the tread portion 16 so that the longitudinal direction of the transponder T is oriented in the tire circumferential direction. The transponder T is arranged at a position near the belt layer 17. The position of the transponder T is defined by the auxiliary component 1 embedded in the tread rubber together with the transponder T. That is, the thickness t of the thick portion 1b of the auxiliary component 1 is 2 mm.
As described above, the transponder T is disposed at a position separated from the metal component (belt layer 17) constituting the tread portion 16 by a distance of 2 mm or more.

By arranging the transponder T at a distance of 2 mm or more from the metal component forming the tread portion 16 as described above, it is possible to prevent communication failure of the transponder T due to radio interference of this metal component. it can. In the above embodiment, it is preferable that the rubber composition constituting the auxiliary component 1 is substantially the same as the adjacent tread rubber composition.

[0024]

EXAMPLE The tire size was 11R22.5, and FIGS.
In a heavy-duty pneumatic radial tire having a bead structure shown in FIG. 5, a glass-encapsulated transponder is embedded in a bead filler using a transponder auxiliary part shown in FIG. 1 so that the longitudinal direction thereof is the tire circumferential direction, The tires of Example 1 (FIG. 3), Example 2 (FIG. 4), and Example 3 (FIG. 5) in which the thickness t of the thick part of the auxiliary component was variously varied were manufactured. The vulcanization rate of the rubber auxiliary component is 0%.

For these test tires, the communication failure rate of new tires was measured by the following test method, and the results are shown in Table 1.
It was shown to. Communication failure rate at the time of new article: For each test tire, communication was attempted with the transponder at the bead portion using a transponder scanner when the test tire was new, and the communication failure rate (%) was determined.

[0026]

As apparent from Table 1, Examples 1 to
In the pneumatic radial tire for heavy load No. 3, by setting the thickness t of the thick part of the auxiliary component to 2.0 mm or more, it was possible to prevent the transponder from being unable to communicate.

Next, in Example 1, the thickness t of the thick part of the rubber auxiliary component was set to 3.0 mm, and tires having various vulcanization rates before embedding were manufactured.
For these test tires, the tire failure rate was measured by the following test method, and the results are shown in Table 2. Tire failure rate: Each test tire was mounted on a truck,
After traveling 100,000 km at an air pressure of 800 kMa, the incidence (%) of tire failure in the bead portion was determined.

[0029]

As is clear from Table 2, tire failure occurs under the above measurement conditions regardless of whether the rubber auxiliary component before embedding is in an unvulcanized state, a semi-vulcanized state, or a vulcanized state. I never did.

[0031]

As described above, according to the present invention, there is provided an auxiliary component made of a rubber composition having a holding portion into which a transponder is fitted and a thick portion defining the embedding depth of the transponder. With this configuration, the transponder is embedded in the tire using the auxiliary component. Therefore, the embedding depth of the transponder can be easily set based on the thickness of the thick portion of the auxiliary component.

Therefore, when the transponder is buried in the bead portion of the pneumatic radial tire for heavy load, the distance between the metal component and the transponder can be forcibly secured. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing auxiliary parts of a transponder for a tire according to an embodiment of the present invention.

FIGS. 2A to 2D are cross-sectional views illustrating modifications of auxiliary parts of the transponder for a tire according to the present invention.

FIG. 3 is a cross-sectional view showing a bead portion of a heavy-duty pneumatic radial tire in which a transponder is embedded using the transponder auxiliary component of the present invention.

FIG. 4 is a cross-sectional view showing a bead portion of a heavy-duty pneumatic radial tire in which a transponder is embedded using the transponder auxiliary component of the present invention.

FIG. 5 is a sectional view showing a bead portion of a heavy-duty pneumatic radial tire in which a transponder is embedded using the transponder auxiliary component of the present invention.

FIG. 6 is a cross-sectional view showing a tread portion of a heavy-duty pneumatic radial tire in which a transponder is embedded using the transponder auxiliary component of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auxiliary component 1a Holding part 1b Thick part 11 Bead part 12 Bead core 13 Bead filler 14 Carcass layer 15 Steel reinforcement 16 Tread part 17 Belt layer 18 Main groove T Transponder

Claims (6)

[Claims] 1. An auxiliary component comprising a rubber composition for embedding a transponder in a tire, comprising: a holding portion into which the transponder is fitted; and a thick portion for defining an embedding depth of the transponder. Auxiliary parts for transponders for tires. 2. The auxiliary part of a transponder for a tire according to claim 1, wherein the thickness of the thick part is 2.0 mm or more. 3. The auxiliary component of a transponder for a tire according to claim 1, wherein the rubber composition is in one of an unvulcanized state and a vulcanized state. 4. The auxiliary component of a transponder for a tire according to claim 1, wherein the rubber composition is substantially the same as the tire rubber composition at a transponder embedding position. 5. JIS-vulcanized state of the rubber composition
The auxiliary component of the transponder for a tire according to any one of claims 1 to 4, wherein the A component has an A hardness of 60 to 85. 6. The transponder for a tire according to claim 1, wherein the transponder is used for burying a glass-encapsulated transponder in which components such as an antenna, a memory, and a communication circuit are enclosed in a glass tube. parts.