JP2006306171A - Protecting member, electronic monitoring device, and pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protecting member, an electronic monitoring device and a pneumatic tire capable of prolonging the lifetime of the electronic monitoring device and enhancing the durability of the tire. <P>SOLUTION: The pneumatic tire according to the invention is equipped with an inner liner 13 installed inside a carcass layer about the tire radial direction and the electronic monitoring device to give and receive the tire information according to the prescribed signal and includes a protecting layer 20 to protect the electronic monitoring device 30 installed between the inner liner 13 and the electronic monitoring device 30, wherein the protecting layer 20 has a hard rubber layer 21 layer having a prescribed modulus of elasticity and soft rubber layers 22a and 22b having a smaller modulus of elasticity than the rubber layer 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a protective member that protects an electronic monitor device attached to a pneumatic tire, an electronic monitor device, and a pneumatic tire, and more particularly to a protective member that extends the life of the electronic monitor device and improves tire durability. The present invention relates to an electronic monitor device and a pneumatic tire.

  Conventionally, in order to obtain tire information (for example, identification, internal pressure, temperature, speed, and number of rotations) regarding a pneumatic tire, an electronic monitor device in which an electronic device (for example, a semiconductor chip) is accommodated is provided in the pneumatic tire. There is known a technique capable of performing real-time communication with an electronic monitor device from a position away from a pneumatic tire (for example, a monitor mounted on a vehicle) by being attached to the inner liner.

  The electronic device has a function of storing manufacturing data, inventory data, sales information, distribution information, physical property data, and the like, and a function of monitoring the tire information described above.

  By the way, in a pneumatic tire, deformation, impact, vibration, and the like during travel are large, and the deformation, impact, vibration, and the like are repeatedly performed, which adversely affects the life and performance of the electronic monitor device described above.

For this reason, a technique is disclosed in which shock and vibration during travel of a pneumatic tire are mitigated by providing a single-layer protective member between the inner liner and the electronic monitor device (Patent Document 1). According to this technique, since the transmission of shock and vibration to the electronic monitor device is suppressed, the influence on the life and performance of the electronic monitor device is mitigated.
JP-A-57-147901 (pages 8 to 12, FIG. 1)

  However, when a soft rubber layer (soft rubber layer) is used as the protective member described above, the impact and vibration on the electronic monitor device during travel are suppressed, but the high level of the electronic monitor device and the protective member is high. Depending on the thickness (thickness), the strain (so-called shear strain) on the bonding surface between the inner liner and the protective member increases.

  As a result, the durability of bonding between the inner liner and the electronic monitor device is reduced, so that the protective member is peeled off from the inner liner and the electronic monitor device is dropped and damaged. It was.

  Further, the protective member is peeled from the inner liner, so that the strength of the inner liner on the surface to be bonded to the protective member is lowered, and the pneumatic tire may be broken (punctured).

  In addition, when a hard rubber layer (hard rubber layer) is used as the protective member, the shear strain generated by the height of the electronic monitor device and the protective member is reduced, but the electronic monitor device and the protective member Breakage (so-called shear fracture) occurs due to the step (rigid step).

  In addition, due to the occurrence of shear fracture, the impact and vibration on the electronic monitor device are not alleviated, and as described above, the electronic monitor device is peeled off from the inner liner, and the electronic monitor device is dropped and damaged. There was a problem of doing. Furthermore, as described above, the pneumatic tire may be broken.

  Therefore, the present invention has been made in view of such problems, and provides a protective member, an electronic monitoring device, and a pneumatic tire that extend the life of the electronic monitoring device and improve tire durability. With the goal.

  The first feature of the present invention is that an inner liner (inner liner 13) provided inside the tire radial direction of the carcass layer (carcass layer 12) and tire information (for example, identification, internal pressure, temperature, speed) by a predetermined signal. And a rotating tire) is attached to a pneumatic tire (pneumatic tire 1) provided with an electronic monitoring device (electronic monitoring device 30) and provided between the inner liner and the electronic monitoring device. A protective member (protective layer 20) for protecting an electronic monitor device, wherein the protective member is a hard layer (hard rubber layer 21) that is a layer having a predetermined elastic modulus, and a layer having a lower elastic modulus than the hard layer And having a soft layer (soft rubber layers 22a, 22b).

  According to such a feature, since the protective member has the hard layer and the soft layer, the shear strain generated on the bonding surface between the inner liner and the protective member, and the shear generated by the rigidity step between the electronic monitor device and the protective member. Destruction can be suppressed.

  As a result, the durability of bonding between the inner liner and the protective member is improved, and the protective member can be prevented from peeling off from the inner liner, so that the electronic monitor device is dropped and damaged. Can be prevented. Thereby, the lifetime of the electronic monitor device can be extended.

  Further, by preventing the protective member from being peeled off from the inner liner, it is possible to suppress a decrease in the strength of the inner liner on the adhesive surface with the protective member, so that the tire durability can be improved.

  The second feature of the present invention relates to the first feature, and is summarized in that the hard layer or the soft layer is made of a rubber material.

  According to this feature, the shear strain can be suppressed by the soft layer, and the shear failure can be suppressed by the hard layer, which can further extend the life of the electronic monitor device and improve the tire durability. Can be made.

  The third feature of the present invention relates to the second feature, wherein the elastic modulus of the hard layer is 0.8 to 2 MPa, and the elastic modulus of the soft layer is 0.1 to 0.6 MPa. And

  The fourth feature of the present invention relates to the first feature to the third feature, and is summarized in that the soft layer is provided on the inner side in the tire radial direction of the hard layer.

  The fifth feature of the present invention is related to the first feature to the third feature, and is summarized in that the soft layer is provided on the inner side and the outer side in the tire radial direction of the hard layer.

  The sixth feature of the present invention relates to the first feature to the third feature, and is summarized in that the shape of the cross section in the tire circumferential direction of the soft layer is a triangle.

  According to such a feature, the soft member is configured in a triangular shape in the cross section in the tire width direction, so that the impact and vibration during traveling of the pneumatic tire are mitigated, in particular, the impact generated in the stepping portion and the kicking portion and Since vibration is mitigated and impact and vibration transmission to the electronic monitor device can be efficiently suppressed, the life of the electronic monitor device can be extended and tire durability can be improved.

The seventh feature of the present invention relates to the first feature to the sixth feature, and is summarized in that the surface area of the protective member excluding the contact surface with the pneumatic tire is 2000 to 8000 mm ² .

  The eighth feature of the present invention relates to the first feature to the seventh feature, and is summarized in that the thickness of the protective member is 15 mm or less.

  A ninth feature of the present invention relates to the first feature to the eighth feature, and is summarized in that the thickness of the soft layer is 1 to 5 mm.

  A tenth feature of the present invention relates to the first feature to the ninth feature, and is summarized in that the thickness of the hard layer is 3 to 8 mm.

  An eleventh feature of the present invention relates to the first feature to the tenth feature, and is summarized in that it is a pneumatic tire provided with the protective member according to any one of claims 1 to 10.

  According to this feature, it is possible to provide a pneumatic tire including a protective member that can extend the life of the electronic monitoring device and improve tire durability.

  A twelfth feature of the present invention relates to the first feature to the tenth feature, and is summarized in that it is an electronic monitor device including the protective member according to any one of claims 1 to 10.

  According to such a feature, it is possible to provide an electronic monitor device including a protective member that can extend the life of the electronic monitor device and improve tire durability.

  ADVANTAGE OF THE INVENTION According to this invention, the protection member which extends the lifetime of an electronic monitor apparatus and improves tire durability, an electronic monitor apparatus, and a pneumatic tire can be provided.

  Next, an example of the protective layer attached to the pneumatic tire according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Configuration of protective layer attached to pneumatic tire)
FIG. 1 is a cross-sectional view in the tire width direction of a pneumatic tire 1 to which a protective layer 20 according to this embodiment is attached. As shown in FIG. 1, the pneumatic tire 1 has a pair of bead portions 11 including a bead core 11a and a bead filler 11b that contact a rim portion (not shown) of the wheel. Specifically, a steel cord or the like is used for the bead core 11a constituting the bead unit 11. The pneumatic tire 1 has a carcass layer 12 that is a skeleton of the pneumatic tire 1.

  An inner liner 13 that is a highly airtight rubber layer corresponding to a tube is provided inside the carcass layer 12 in the tire radial direction. In addition, an electronic monitoring device 30 is provided on the inner side of the inner liner 13 in the tire radial direction to exchange tire information by a predetermined signal.

  The electronic monitor device 30 contains an electronic device such as a semiconductor chip or an IC tag (RFID). The electronic device has a function of storing manufacturing data, inventory data, sales information, distribution information, physical property data, and the like, and a function of monitoring tire information (for example, identification, internal pressure, temperature, speed, and rotation speed). It is provided.

  Between the inner liner 13 and the electronic monitor device 30, a hard rubber layer (hard layer) having a predetermined elastic modulus and a soft rubber layer (soft layer) which is a layer having a lower elastic modulus than the hard rubber layer are provided. A protective layer 20 (protective member) is provided. The details of the hard rubber layer and the soft rubber layer will be described later.

  A first belt layer 14, a second belt layer 15, and a third belt layer 16 are provided on the outer side of the carcass layer 12 in the tire radial direction. A tread portion 17 that contacts the road surface is provided on the outer side of the third belt layer 16 in the tire radial direction.

  Next, the protective layer 20 that protects the electronic monitor device 30 described above will be described with reference to FIG. FIG. 2 is a perspective view showing the electronic monitor device 30 and the protective layer 20.

As shown in FIG. 2, the surface area (H2 + H3 + H4 + H5 + H6 = Hm) of the protective layer 20 excluding the ground contact surface (H1) with the inner liner 13 is preferably 2000 to 8000 mm ² . If the surface area (Hm) is less than 2000 mm ² , the electronic monitor device 30 may not be able to be protected due to insufficient buffering against deformation or impact received from the pneumatic tire 1. When the surface area (Hm) exceeds 8000 mm ² , the pneumatic tire may become non-uniform (so-called uniformity is adversely affected) due to the weight of the protective layer 20 itself.

  Moreover, it is preferable that the thickness ((alpha)) of the protective layer 20 is 15 mm or less. When the thickness (α) of the protective layer 20 exceeds 15 mm, there is a problem that strain (so-called shear strain) on the bonding surface between the inner liner 13 and the protective layer 20 becomes large.

  Next, the protective layer 20 described above will be described with reference to FIG. FIG. 3 is a sectional view of the inner liner 13, the protective layer 20, and the electronic monitoring device 30 (AA sectional view in FIG. 2).

  As shown in FIG. 3, the protective layer 20 having the hard rubber layer 21 and the soft rubber layers 22a and 22b is provided between the inner liner 13 and the electronic monitor device 30 as described above. Further, a soft rubber layer 22 a is provided outside the hard rubber layer 21 in the tire radial direction, and a soft rubber layer 22 b is provided inside the hard rubber layer 21 in the tire radial direction.

  Here, the elastic modulus of the hard rubber layer 21 is preferably 0.8 to 2 MPa, and the thickness of the hard rubber layer 21 is preferably 3 to 8 mm.

  The elastic modulus of the soft rubber layers 22a and 22b is preferably 0.1 to 0.6 MPa, and the thickness of the soft rubber layers 22a and 22b is preferably 1 to 5 mm.

  If the elastic modulus and thickness of the hard rubber layer 21 and the soft rubber layers 22a and 22b are within the above-described ranges, the life of the electronic monitor device can be further extended and the tire durability can be improved. it can.

  Next, in order to further clarify the effects of the present invention, Comparative Examples 1 to 3 and a protective layer (hard rubber layer or soft rubber layer) according to an example to which the present invention is applied are attached to a pneumatic tire. The results of the test conducted in this way will be described.

  The sizes of the pneumatic tires to which the protective layers according to Comparative Examples 1 to 3 and the Examples are attached are all “205 / 55R16”. That is, the tread width is about 205 mm, the flatness (ratio of the tire cross-section height to the tire width) is about 55%, and the rim diameter is 16 inches.

Moreover, the hard rubber layer used in any one of Comparative Examples 1 to 3 and Examples has an elastic modulus of 1.5 MPa and a thickness of 4.0 mm. Further, the soft rubber layer used in any one of Comparative Examples 1 to 3 and Examples has an elastic modulus of 0.2 MPa and a thickness of 2.5 mm.

Table 1 shows the configuration of the protective layer according to Comparative Example 1 to Comparative Example 3 and Examples, and the test results of the pneumatic tire to which the protective layer is attached.

  As shown in Table 1, in Comparative Example 1, the upper and lower protective layers and the intermediate protective layer are soft rubber layers. The upper and lower protective layers are protective layers provided on the inner side in the tire radial direction and the outer side in the tire radial direction of the intermediate protective layer. The intermediate protective layer is a protective layer provided between the upper and lower protective layers.

  In Comparative Example 2, the upper and lower protective layers and the intermediate protective layer are hard rubber layers. In Comparative Example 3, the upper and lower protective layers are hard rubber layers, and the intermediate protective layer is a soft rubber layer. In the embodiment to which the present invention is applied, the upper and lower protective layers are soft rubber layers and the intermediate protective layer is a hard rubber layer.

<HSP drum test>
The HSP (High Speed) drum test is a test in which the drum speed is increased by 10 km / h at regular intervals on a drum installed in a room, and the speed until the pneumatic tire breaks down is measured.

  As a result of the test, the pneumatic tire to which the protective layer according to the example to which the present invention was applied was more durable than the pneumatic tire to which the protective layer according to Comparative Examples 1 to 3 was attached. Evaluated as excellent.

  That is, it was found that the tire durability was improved because the pneumatic tire to which the protective layer according to the example was attached can suppress peeling of the electronic monitoring device and failure of the pneumatic tire.

<Long grand ram mileage test>
The long ground ram running distance test is a test in which a drum installed indoors is run at a constant speed under conditions of low internal pressure and high load, and the distance until the pneumatic tire breaks down is measured. The test was terminated when the vehicle traveled 20000 km.

  As a result of the test, the pneumatic tire attached with the protective layer according to the example to which the present invention was applied completed 20000 km.

  That is, the pneumatic tire to which the protective layer according to the example is attached is separated from the pneumatic monitor with the protective layer according to Comparative Examples 1 to 3 and the failure of the pneumatic tire. It was found that tire durability was improved.

(Action / Effect)
According to the protective layer 20 according to the present embodiment described above, by having the hard rubber layer 21 and the soft rubber layers 22a and 22b, the shear strain on the bonding surface between the inner liner 13 and the protective layer 20, and the electronic type Shear failure that occurs due to a rigid step between the monitoring device 30 and the protective layer 20 can be suppressed.

  As a result, the adhesion durability between the inner liner 13 and the protective layer 20 (soft rubber layer 22a) is improved, and the protective layer 20 can be prevented from peeling off from the inner liner 13, so that the electronic monitor device It is possible to prevent the 30 from dropping off and being damaged. Thereby, the lifetime of the electronic monitor device 30 can be extended.

  Further, by preventing the protective layer 20 from peeling off from the inner liner 13, it is possible to suppress a decrease in strength of the inner liner 13 on the adhesive surface with the protective layer 20, thereby improving tire durability. be able to.

  In addition, it is possible to provide the pneumatic tire 1 including the protective layer 20 that can extend the life of the electronic monitoring device 30 and improve tire durability.

  Furthermore, the electronic monitor device 30 including the protective layer 20 that can extend the life of the electronic monitor device 30 and improve tire durability can be provided.

(Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, the embodiment of the present invention can be modified as follows. 4 and 5 are cross-sectional views (A-A cross-sectional view in FIG. 2) of the inner liner 13, the protective layer 20, and the electronic monitor device 30 according to a modified example of the present invention.

  As shown in FIG. 4, the inner liner 13 is fixed on the outer side in the tire radial direction of the hard rubber layer 23, and the soft rubber layer 24 is provided on the inner side in the tire radial direction of the hard rubber layer 21.

  Further, as shown in FIG. 5, soft rubber layers 26 a to 26 d having a triangular shape in the tire circumferential cross section are provided on the inner side in the tire radial direction and the outer side in the tire radial direction of the hard rubber layer 23.

  As a result, the soft rubber layers 26a to 26d are configured in a triangular shape in the cross section in the tire width direction, so that impacts and vibrations during travel of the pneumatic tire 1 are mitigated, and are particularly generated in the stepping portion and the kicking portion. Since the impact and vibration that occur are alleviated and the transmission of the impact and vibration to the electronic monitoring device 30 can be effectively suppressed, the life of the electronic monitoring device 30 can be extended and the tire durability can be improved. Can be made.

  Of course, the soft rubber layer having a triangular shape in the tire circumferential cross section may be provided only on the inner side in the tire radial direction or the outer side in the tire radial direction.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

It is sectional drawing of the tire width direction of the pneumatic tire 1 to which the protective layer 20 which concerns on this embodiment was attached. 1 is a perspective view of an electronic monitor device 30 and a protective layer 20 according to the present embodiment. It is sectional drawing of the protective layer 20 which concerns on this embodiment. It is sectional drawing of the protective layer 20 which concerns on the example of a change of this invention. It is sectional drawing of the protective layer 20 which concerns on the example of a change of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pneumatic tire 11 ... Bead part, 11a ... Bead core, 11b ... Bead filler, 12 ... Carcass layer, 13 ... Inner liner, 14 ... 1st belt layer, 15 ... 2nd belt layer, 16 ... 3rd belt layer, DESCRIPTION OF SYMBOLS 17 ... Tread part, 20 ... Protective layer 21,23,25 ... Hard rubber layer, 22a, 22b, 24, 26a-26d ... Soft rubber layer, 30 ... Electronic monitor apparatus

Claims (12)

An inner liner provided on the inner side in the tire radial direction of the carcass layer and an electronic monitor device that transmits and receives tire information by a predetermined signal is attached to a pneumatic tire, and the inner liner, the electronic monitor device, A protective member for protecting the electronic monitor device provided between
A hard layer that is a layer having a predetermined elastic modulus;
And a soft layer that is a layer having a lower elastic modulus than the hard layer.   The protective member according to claim 1, wherein the hard layer or the soft layer is made of a rubber material. The elastic modulus of the hard layer is 0.8-2 MPa,
The protective member according to claim 1 or 2, wherein the elastic modulus of the soft layer is 0.1 to 0.6 MPa.   The said soft layer is provided in the tire radial direction inner side of the said hard layer, The protection member as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned.   The protective member according to any one of claims 1 to 3, wherein the soft layer is provided on an inner side in a tire radial direction and an outer side in the tire radial direction of the hard layer.   The protective member according to any one of claims 1 to 5, wherein the soft layer has a triangular cross-section in the tire circumferential direction. 7. The protective member according to claim 1, wherein a surface area of the protective member excluding a contact surface with the pneumatic tire is 2000 to 8000 mm ² .   The thickness of the said protection member is 15 mm or less, The protection member as described in any one of Claim 1 thru | or 7 characterized by the above-mentioned.   The thickness of the said soft layer is 1-5 mm, The protection member as described in any one of the Claims 1 thru | or 8 characterized by the above-mentioned.   The thickness of the said hard layer is 3-8 mm, The protection member as described in any one of Claim 1 thru | or 9 characterized by the above-mentioned.   A pneumatic tire comprising the protective member according to claim 1. An electronic monitor device comprising the protective member according to claim 1.

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