JP4639828B2 - TIRE ELECTRONIC DEVICE AND ITS INSTALLATION METHOD - Google Patents

Description

  The present invention relates to a tire electronic device mounted on a rim outer peripheral surface of a wheel and a mounting method thereof, and more specifically, a sufficient adhesive is sandwiched between an adherend surface of a case and a rim outer peripheral surface of a wheel and bonded. The present invention relates to a tire electronic device and an attachment method thereof that can increase the adhesive force of an agent.

  Conventionally, in order to measure and transmit a physical quantity such as temperature and air pressure in the tire chamber and transmit identification information unique to the tire, an electronic device is arranged in the tire chamber. Such an electronic device for tire has a structure in which the electronic component is enclosed in a case in order to protect the electronic component from moisture and prevent external force from being applied to the electronic component.

  Incidentally, an adhesive is used as means for mounting the tire electronic device on the outer peripheral surface of the rim of the wheel (see, for example, Patent Document 1). In particular, when an elastic adhesive is used and the thickness thereof is sufficiently secured, vibration transmitted from the tire to the electronic component through the rim can be attenuated.

However, when an adhesive is applied to the adherend surface of the case of the tire electronic device and this is pressure-bonded to the outer peripheral surface of the rim of the wheel, the adhesive may flow out from under the case, resulting in a decrease in adhesion. In particular, in the case of an elastic adhesive, unless a sufficient adhesive is sandwiched between the adherend surface of the case and the rim outer peripheral surface of the wheel, the effect of attenuating vibration from the tire is insufficient. In addition, since the degree to which the adhesive flows out from under the case when the tire electronic device is crimped is different for each operator, it is difficult to obtain a stable adhesive force.
JP-A-9-136517

  SUMMARY OF THE INVENTION An object of the present invention is to provide a tire electronic device and a method of attaching the same, in which a sufficient adhesive is sandwiched between the adherend surface of the case and the rim outer peripheral surface of the wheel, and the adhesive force by the adhesive can be increased. There is to do.

In order to achieve the above object, an electronic device for tire according to the present invention includes an electronic component for transmitting tire information and a case for housing the electronic component, and is attached to an outer peripheral surface of a wheel rim with an adhesive. The tire electronic device to be worn includes a spacer for maintaining a gap between the adherend surface of the case and the rim outer peripheral surface of the wheel , and the spacer is separate from the case, and the JIS- A hardness is 50-70, It is characterized by the above-mentioned.

The tire electronic device mounting method of the present invention for achieving the above object includes an electronic component for transmitting tire information and a case for housing the electronic component, and an adherend surface of the case A spacer for maintaining a gap between the wheel and the rim outer peripheral surface of the wheel, the spacer is separate from the case, and a tire electronic device having a JIS-A hardness of 50 to 70 is prepared. The case is adhered to the wheel rim outer peripheral surface with an adhesive with the spacer interposed between the adherend surface of the case and the wheel rim outer peripheral surface. .

  In the present invention, the tire electronic device includes a spacer for maintaining a gap between the adherend surface of the case and the rim outer peripheral surface of the wheel. Therefore, it is possible to prevent the adhesive from flowing out from under the case when the adhesive is applied to the adherend surface of the case of the tire electronic device and is crimped to the rim outer peripheral surface of the wheel. Therefore, a sufficient adhesive can be sandwiched between the adherend surface of the case and the rim outer peripheral surface of the wheel, and the adhesive force by the adhesive can be increased. In particular, in the case of an elastic adhesive, the effect of attenuating vibration from the tire can be sufficiently ensured. Further, since the gap between the adherend surface of the case and the rim outer peripheral surface of the wheel is defined by the height of the spacer, a stable adhesive force can be obtained regardless of the skill level of the operator.

In the present invention, the spacer is as long as to ensure a gap between the adherend surface and the rim outer circumferential surface of the wheel of the case, but not its structure is specifically limited, the spacer and the casing to separate. In any case, in order to ensure good adhesion, the height of the spacer is preferably 0.5 to 5.0 mm. Moreover, it is preferable that the abundance ratio of the spacer in the adherend surface of the case is 0.1 to 30%. The existence ratio of the spacer is the ratio of the projected area of the spacer to the projected area when the adherend surface of the case is projected in the adhesion direction.

  The hardness of the spacer is preferably equal to the hardness of the adhesive after curing. Thereby, it can avoid that the vibration damping effect by an elastic adhesive agent is inhibited. Here, to make the hardness equal, when the JIS-A hardness (JIS K6253) is used as an index, the JIS-A hardness of the spacer is in the range of 95 to 105% of the JIS-A hardness of the adhesive after curing. It is to be. As an adhesive for adhering the case of the tire electronic device to the outer peripheral surface of the rim of the wheel, it is preferable to use a one-component polyurethane adhesive (moisture curing type). The one-pack type polyurethane adhesive has a JIS-A hardness in a range of 35 to 75 at room temperature, and is an elastic adhesive suitable for bonding a tire electronic device.

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

  FIG. 1 shows a tire wheel assembly equipped with a tire electronic device according to an embodiment of the present invention. 2 and 3 show a tire electronic device according to an embodiment of the present invention. In FIG. 1, a tire air chamber 4 is formed between the pneumatic tire 1 and the rim outer peripheral surface 3 of the wheel 2, and the tire electronics are connected to the rim outer peripheral surface 3 in the tire air chamber 4 via an adhesive 5. A device 11 is mounted.

  As shown in FIG. 2, the tire electronic device 11 includes an electronic component 12 for transmitting tire information and a case 13 for housing the electronic component 12. The electronic component 12 includes a transmitter, a receiver, a temperature sensor, a pressure sensor, a control circuit, a battery, etc., and measures physical quantities such as temperature and air pressure and transmits them to the outside of the tire, or tire-specific identification information. Is sent to the outside of the tire. The case 13 has a hollow structure and is molded from plastic or the like.

As shown in FIG. 3, the tire electronic device 11 includes a plurality of spacers 15 for maintaining a gap between the adherend surface 14 of the case 13 and the rim outer peripheral surface 3 of the wheel 2. These spacers 15, which is one formed so as to protrude from the vicinity of the corners of the bonding surface 14 and the case 13 are separate. The height of the spacer 15 is preferably 0.5 to 5.0 mm. Thereby, when the tire electronic device 11 is mounted on the rim outer peripheral surface 3, it is possible to avoid the portion excluding the spacer 15 from coming into contact with the rim outer peripheral surface 3. The thickness of the adhesive 5 interposed in the gap between the adherend surface 14 and the rim outer peripheral surface 3 is required to be 0.5 to 6.0 mm from the viewpoint of vibration absorption, but is 1.0 mm or more in the thinnest portion. It is desirable to ensure.

  The abundance ratio of the spacers 15 on the adherend surface 14 of the case 13 is 0.1 to 30%, more preferably 0.1 to 10%. That is, a plurality of spacers 15 can be provided, but the existence ratio of the spacers 15 is defined in the above range. If the abundance ratio of the spacers 15 is less than 0.1%, it becomes difficult to secure a gap between the adherend surface 14 and the rim outer peripheral surface 3, and conversely if it exceeds 30%, the adherend surface 14 and the rim outer peripheral surface are obtained. The amount of the adhesive 5 sandwiched between the two and the adhesive 3 is reduced, and the adhesive force becomes insufficient.

To paste the tire electronics device 11 described above to the rim outer circumferential surface 3 of the wheel 2, after applying the adhesive 5 uncured adherend surface 14 of the case 13, the spacer 15 into the adhesive 5 uncured And the case 13 may be pressure-bonded to the outer peripheral surface 3 of the rim.

  According to this embodiment, since the spacer 15 is interposed between the adherend surface 14 and the rim outer peripheral surface 3, the gap between the adherend surface 14 and the rim outer peripheral surface 3 regardless of the skill level of the operator. Is defined by the spacer 15. Therefore, it is possible to reliably prevent the adhesive 5 from flowing out from under the case 13 when the tire electronic device 11 is crimped, and to sufficiently secure the adhesive force. Furthermore, the vibration damping effect by the adhesive 5 can be sufficiently obtained.

  Here, the hardness of the spacer 15 is preferably equal to the hardness of the adhesive 5 after curing. Even when the spacer 15 is interposed between the adherend surface 14 and the rim outer peripheral surface 3 by making the hardness of the spacer 15 equal to the hardness of the adhesive 5 after curing, the adhesive 5 Inhibition of the vibration damping effect can be avoided.

  As the adhesive 5 for adhering to the rim outer peripheral surface 3 of the tire electronic device 11, a one-component polyurethane adhesive such as Hamatite WS202 (trade name) manufactured by Yokohama Rubber Co., Ltd. is suitable. Such a one-pack type polyurethane adhesive has a JIS-A hardness in the range of 35 to 75 at room temperature, and is an elastic adhesive suitable for bonding the tire electronic device 11.

  4-5 shows the principal part of the electronic device for tires which consists of other embodiment of this invention. Since this embodiment is different from the above-described embodiment only in the shape of the spacer, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 4 and 5, the tire electronic device 11 includes a single spacer 25 for maintaining a gap between the adherend surface 14 of the case 13 and the rim outer peripheral surface 3 of the wheel 2. The spacer 25 is one in which are formed so as to protrude from the center portion of the bonding surface 14 and the case 13 are separate.

To paste the tire electronics device 11 described above to the rim outer circumferential surface 3 of the wheel 2, after applying the adhesive 5 uncured adherend surface 14 of the case 13, the spacer 25 into the adhesive 5 uncured And the case 13 may be pressure-bonded to the outer peripheral surface 3 of the rim.

  Also in this embodiment, since the spacer 25 is interposed between the adherend surface 14 of the case 3 and the rim outer peripheral surface 3, the adherend surface 14, the rim outer peripheral surface 3, and the like regardless of the skill level of the operator. This gap is defined by the spacer 25. Therefore, it is possible to reliably prevent the adhesive 5 from flowing out from under the case 13 when the tire electronic device 11 is crimped, and to sufficiently secure the adhesive force. Furthermore, the vibration damping effect by the adhesive 5 can be sufficiently obtained.

  In each embodiment mentioned above, since case 13 which accommodates an electronic component is stuck on rim outer peripheral surface 3, it is preferred to give the same curvature as rim outer peripheral surface 3 to the bonded surface 14. On the other hand, it is desirable that the tire electronic device 11 can be mounted on a plurality of types of wheels. Therefore, when a curvature is imparted to the adherend surface 14 of the case 13, the curvature radius of the adherend surface 14 is preferably made to coincide with the substantially central value of the rim well radii of a plurality of wheels assumed to be mounted. For example, when mounting on a wheel having a rim diameter of 14 to 20 inches, it is considered that a rim well radius is 161 mm for a wheel with a rim diameter of 14 inches and a rim well radius is 240 mm for a wheel with a rim diameter of 20 inches. Then, the radius of curvature of the adherend surface 14 of the case 13 may be about 200 mm.

Further, when the spacer is separated from the case of the tire electronic device , a spacer having a diameter of 0.5 to 3.0 mm and having a spherical shape, a lump shape, or a particle shape may be used. In this case, it is desirable that a large number of spacers are mixed in the adhesive, and the ratio of the spacers in the adhesive is 10 to 50 volume%. The JIS-A hardness of the spacer at normal temperature is preferably 50 to 70.

  The tire electronic devices of Comparative Examples 1 to 4 and Examples 1 to 4 in which only the case shape and the spacer were varied were prepared. About the case shape, the to-be-adhered surface was made into the plane or a curved surface. When the surface to be bonded is a curved surface, the radius of curvature is larger than the rim well radius of the wheel. Moreover, when providing a spacer, the height was 0.7 mm.

Each of these tire electronic devices was adhered to the outer peripheral surface of the rim of the wheel using a one-pack type polyurethane adhesive. Then, after the adhesive is sufficiently cured, the maximum thickness and the minimum thickness of the adhesive interposed between the adherend surface of the case and the outer peripheral surface of the rim are measured, and further the adhesion to the tensile force of the tire electronic device The strength was measured and the results are shown in Table 1. The evaluation result of the adhesive strength is shown by an index with Comparative Example 1 as 100. The larger the index value, the greater the adhesive strength.

  In Table 1, it can be seen that the tire electronic devices of Comparative Examples 1 and 2 were pressure-bonded under the same conditions, but there was a large difference in the adhesive force between them. This is because the spacers are not interposed between the adherend surface of the case and the rim outer peripheral surface of the wheel, resulting in variations in the thickness of the adhesive. In particular, in Comparative Example 2, a large amount of adhesive protruded from the bottom of the case. Similarly, the tire electronic devices of Comparative Examples 3 and 4 were bonded under the same conditions, but there was a large difference in the adhesive force between the two. On the other hand, in Examples 1 to 4, the adhesive thickness was stable, the adhesive strength was high, and the adhesive strength variation was small.

It is sectional drawing which shows the tire wheel assembly which mounted | wore with the tire electronic device which consists of embodiment of this invention. It is a side view which shows the electronic device for tires which consists of embodiment of this invention. It is a perspective view which shows the electronic device for tires which consists of embodiment of this invention. It is a side view which shows the principal part of the electronic device for tires which consists of other embodiment of this invention. It is a perspective view which shows the electronic device for tires which consists of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 2 Wheel 3 Rim outer peripheral surface 4 Tire air chamber 5 Adhesive 6 Adhering area 11 Tire electronic device 12 Electronic component 13 Case 14 Bonded surface 15, 25 Spacer

Claims (6)

An electronic device for a tire, which includes an electronic component for transmitting tire information and a case for housing the electronic component, and is adhered to an outer peripheral surface of a rim of the wheel with an adhesive. A tire electronic comprising a spacer for maintaining a gap with the rim outer peripheral surface of the wheel , wherein the spacer is separate from the case, and the spacer has a JIS-A hardness of 50 to 70. apparatus. The tire electronic device according to claim 2 , wherein a height of the spacer is 0.5 to 5.0 mm. Tire electronics device according to claim 1 or 2, wherein the abundance ratio of the spacer in the bonded surface of the case is 0.1 to 30%. An electronic component for transmitting tire information and a case for housing the electronic component , and a spacer for maintaining a gap between the adherend surface of the case and the rim outer peripheral surface of the wheel, A tire electronic device having a JIS-A hardness of 50 to 70 is prepared separately from the case, and the spacer is interposed between the adherend surface of the case and the rim outer peripheral surface of the wheel. And attaching the case to the outer peripheral surface of the wheel rim with an adhesive. The tire electronic device mounting method according to claim 4 , wherein the spacer has a JIS-A hardness of 95 to 105% of a JIS-A hardness of the cured adhesive. The method for mounting an electronic device for tire according to claim 4 or 5 , wherein the adhesive is a one-component polyurethane adhesive.

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