JP2009298327A - Patch designing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a patch designing method used for manufacturing a part retaining patch which is more hardly peeled off while securing strength required for retaining a part to be mounted such as an electronic device. <P>SOLUTION: The patch designing method designs the part retaining patch 15 for retaining the part 13 to be mounted to the pneumatic tire 1 and formed of a predetermined elastic material, and includes at least a modulus of an elasticity setting step of setting the modulus of the elasticity of the part retaining patch 15; an end angle setting step of setting an end angle (α), i.e., an angle at which a mounting surface 15B of the part retaining patch 15 and a side surface 15C are crossed based on the modulus of the elasticity of the part retaining patch 15 set in the modulus of the elasticity setting step; and a thickness setting step of setting a patch thickness, i.e., the thickness of the part retaining patch 15 based on the modulus of the elasticity of the part retaining patch 15 set in the modulus of the elasticity setting step. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a patch design method for holding a part to be attached to a pneumatic tire and designing a part holding patch formed of a predetermined elastic material.

  Conventionally, an electronic device such as a sensor or a radio transmitter is mounted on the inner surface of a pneumatic tire mounted on a rim wheel in order to detect the state of the pneumatic tire mounted on the vehicle (for example, internal pressure, internal temperature, wear). Etc. (attachment parts) are known.

For example, a plate-shaped component holding patch formed of an elastic material such as rubber is bonded to the inner surface of a pneumatic tire, specifically, the inner surface of a tread portion, and an electronic device is attached to the bonded component holding patch. An attached pneumatic tire is disclosed (for example, see Patent Document 1).
JP 2007-24696 A (FIGS. 1 and 2)

  However, the conventional pneumatic tire described above has the following problems. That is, when the rigidity of the component holding patch (rubber hardness) is high, the component holding patch cannot follow the deformation accompanying the rolling of the pneumatic tire, and the component holding patch peels off from the inner surface of the pneumatic tire. There was a problem that it would be easier.

  Specifically, a pneumatic tire mounted on a vehicle rolls while receiving a load. That is, in the tread portion, the ground contact portion in contact with the road surface is deformed into a flat shape in a side view of the pneumatic tire. On the other hand, the non-grounding portion of the tread portion that is not in contact with the road surface has an arc shape.

  Since the tread portion rolls while deforming in this way, if the component holding patch does not follow the tread portion and deform, stress concentrates on the bonded portion between the component holding patch and the inner surface of the pneumatic tire, and the component The holding patch is easily peeled off.

  Of course, if the rigidity of the component holding patch is lowered, the concentration of stress on the bonded portion is reduced and the peeling of the patch can be suppressed. However, there is a problem that the strength of the patch itself is insufficient and the patch is easily damaged.

  Therefore, the present invention has been made in view of such circumstances, and is used to produce a component holding patch that is more difficult to peel off while ensuring the strength required to hold a mounted component such as an electronic device. It is an object to provide a patch design method.

  In order to solve the above-described problems, the present invention has the following features. First, the first feature is a patch design method for designing a component holding patch formed of a predetermined elastic material that holds a mounted component attached to a pneumatic tire, and sets the elastic modulus of the component holding patch. The mounting surface attached to the inner side surface of the pneumatic tire in the component holding patch and the side surface adjacent to the mounting surface intersect based on the elastic modulus setting step to be performed and the elastic modulus of the component holding patch set in the elastic modulus setting step Thickness for setting the patch thickness, which is the thickness of the component holding patch, based on the end angle setting step for setting the end angle, which is the measured angle, and the elastic modulus of the component holding patch set in the elastic modulus setting step Including a setting step.

  According to this feature, by performing the elastic modulus setting step, the end angle setting step, and the thickness setting step, based on the elastic modulus of the component holding patch, the shape of the component holding patch (end angle and patch thickness) Therefore, it is possible to design a component holding patch that is more difficult to peel off while ensuring the strength required for holding a mounted component such as an electronic device.

  Another feature is summarized in that the elastic modulus of the component holding patch is 100% modulus.

  The modulus (unit: MPa) indicates a force to resist in order to keep the original shape when an external force is applied to the object. That is, when a specific elongation is given in the tensile direction, the force is called a modulus (tensile stress). The modulus is a stress when a specific elongation is given to the test piece, and the 100% modulus indicates a tensile stress at the time of 100% elongation.

  Another feature is summarized in that the end angle is set to 90 degrees or less in the end angle setting step.

  Another feature is summarized in that, in the elastic modulus setting step, the elastic modulus of the component holding patch is set based on the mass of the mounted component.

  The other feature is that, in the end angle setting step, if the end angle is “α”, the mass of the mounted part is “g”, and the 100% modulus of the part holding patch is “M100”, 6 ≦ α ≦ 57− The gist is to set the end angle within the range calculated by 15 × M100 and 0.3 × g / 5 ≦ M100, and to set the patch thickness within the range of 2 to 10 mm in the thickness setting step. And

  Another feature is that, in the end angle setting step, the end angle is set to 90 degrees, and in the thickness setting step, a fold thickness that is the thickness of the fold extending from the outer periphery of the component holding patch is set. To do.

  The other feature is that in the thickness setting step, if the pleat thickness is 'h' and the mass of the mounted part is 'g' and the 100% modulus of the part holding patch is 'M100', 0.5≤h≤3.8 The gist is to set the patch fold thickness within a range calculated by −1.5 × M100 and 0.2 × g / 5 ≦ M100.

  Another feature is summarized in that the component holding patch is formed of a material containing butyl rubber.

  ADVANTAGE OF THE INVENTION According to this invention, the patch design method used in order to produce the component holding | maintenance patch which is hard to peel, ensuring the intensity | strength requested | required of holding | maintenance of components to be attached, such as an electronic device, can be provided.

  Next, an example of a pneumatic tire, a component holding patch, and a patch design method according to the present embodiment 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.

(Composition of pneumatic tire)
First, the configuration of a pneumatic tire to which a component holding patch designed by the patch design method according to the present invention is mounted will be described with reference to FIG. FIG. 1 is a cross-sectional view in the tread width direction showing the pneumatic tire according to the present embodiment,
As shown in FIG. 1, the pneumatic tire 1 includes a bead portion 3 that is in contact with a rim (not shown), and a carcass layer 5 that is folded back at the bead portion 3. On the inner peripheral side of the carcass layer 5, an inner liner 7 which is a highly airtight rubber layer corresponding to a tube is provided.

  A tread portion 9 that is in contact with the road surface is provided outside the carcass layer 5 in the tire radial direction. A plurality of belt layers 11 that reinforce the tread portion 9 are provided between the carcass layer 5 and the tread portion 9.

  On the inner side in the tire radial direction of the inner liner 7 located on the inner side in the tire radial direction of the belt layer 11, the mounted state for grasping the state (for example, internal pressure, internal temperature, wear) of the pneumatic tire 1 attached to the vehicle. A component 13 and a component holding patch 15 that holds the mounted component 13 are provided.

(Configuration of mounted parts and parts holding patches)
Next, the configuration of the above-described mounted part and part holding patch will be described with reference to FIGS. FIG. 2 is a perspective view showing the mounted component and the component holding patch according to the present embodiment, and FIG. 3 is a side view showing the mounted component and the component holding patch according to the present embodiment (A in FIG. 2). (Arrow view).

  As shown in FIGS. 2 and 3, the mounted part 13 is attached to a vehicle or the like by a sensor that measures the air pressure (internal pressure), internal temperature, wear, etc. of the compressed air filled in the pneumatic tire 1 or by wireless communication. The electronic device 13A includes a wireless transmitter that transmits the measurement result, and a housing 13B that protects the electronic device 13A.

  The attached component 13 only needs to be attached to the inner surface of the pneumatic tire 1 by the component holding patch 15. For example, tire information input by the manufacturer of the pneumatic tire 1 (for example, name and manufacturing) Of course, it may be an IC chip for storing date, serial number, lot number) or a wireless receiver for receiving various information by wireless communication.

  The component holding patch 15 has a square plate shape made of a predetermined elastic material. In addition, the component holding patch 15 is formed wider than the bottom surface of the housing 13 </ b> B constituting the attached component 13.

  Specifically, the component holding patch 15 is preferably formed of a material containing at least butyl rubber. For example, the component retaining patch 15 is made of ethylene propylene diene monomer rubber (EPDM), natural rubber, a mixture of neoprene rubber and natural rubber, a mixture of chlorobutyl rubber and natural rubber, a mixture of styrene butadiene rubber (SBR) and natural rubber, butadiene rubber. Of course, it may contain a mixture of (BR) and natural rubber.

  The component holding patch 15 includes a fixing surface 15A that is fixed to the mounted component 13 with an adhesive, a double-sided tape, and the like, an attachment surface 15B that is attached to the inner side surface (inner liner 7) of the pneumatic tire 1, and the attachment surface. It has a side surface 15C that is adjacent and connects the fixed surface 15A and the mounting surface 15B.

  The end angle (α), which is the angle at which the mounting surface 15B and the side surface 15C intersect, is preferably 90 degrees or less. If the end angle (α) is larger than 90 degrees, the component holding patch 15 is easily deformed by the centrifugal force of the pneumatic tire 1 or the weight of the attached member 13, and the component holding patch 15 is deformed by the pneumatic tire 1. It may become easy to peel off from the inner surface (inner liner 9).

  Here, in FIG. 2 and FIG. 3, the end portion angle (α) has been described as being 90 degrees or less (that is, the side surface 15C is inclined with respect to the mounting surface 15B), but is not limited thereto. Of course, it may be 90 degrees as shown in FIG.

  For example, when the end angle (α) is 90 degrees, the component holding patch 15 has a fold 17 extending from the outer periphery (side surface 15C) of the component holding patch 15, as shown in FIGS. 5 (a) and 5 (b). You may have.

(Patch design method)
Next, a patch design method for designing the above-described component holding patch 15 will be described with reference to FIG. FIG. 6 is a flowchart showing the patch design method according to the present embodiment.

  As shown in FIG. 6, in step 10, a patch material selection process for selecting a material for the component holding patch 15 is performed. In this patch material selection step, it is preferable to select a material containing at least butyl rubber as the material of the component holding patch 15.

  Next, in step 20, an elastic modulus setting process for setting 100% modulus, which is the elastic modulus of the component holding patch 15, is performed. In this elastic modulus setting step, the 100% modulus that is the elastic modulus of the component holding patch 15 is set based on the mass of the mounted component 13.

  The elastic modulus of the component holding patch 15 is not necessarily limited to 100% modulus, and any elastic material (rubber) may be used as long as it shows the rigidity of the component holding patch 15. Of course.

  Next, in step 30, the attachment surface 15B and the side surface 15C of the component holding patch 15 intersect based on the 100% modulus that is the elastic modulus of the component holding patch 15 set in the elastic modulus setting step (step 20). An end angle setting step of setting an end angle (α) that is an angle is performed. In this end angle setting step, the end angle (α) is preferably set to 90 degrees or less.

  Specifically, in the end angle setting step, when the 100% modulus (elastic modulus) of the component holding patch 15 is high, the end angle is set to be smaller than 90 degrees (hereinafter, acute angle setting), When the 100% modulus of the component holding patch 15 is low, the end angle is set to 90 degrees (hereinafter, an obtuse angle setting).

  When the acute angle is set, assuming that the end angle is 'α', the mass of the mounted component 13 is 'g', and the 100% modulus of the component holding patch 15 is 'M100', 6 ≦ α ≦ 57-15 × M100. In addition, the end angle is set within a range calculated by 0.3 × g / 5 ≦ M100.

  In the acute angle setting, if the end angle (α) is smaller than 6 degrees, the end is too thin and a defect (defective product) may occur at the end during manufacture. On the other hand, when the end portion angle (α) is larger than the value calculated by “57-15 × M100”, the component holding patch 15 follows the deformation of the tread portion 9 accompanying the rolling of the pneumatic tire 1. It may not be possible to deform.

  In addition, if the 100% modulus (M100) is smaller than “0.3 × g / 5” in the acute angle setting, the strength of the patch itself may be insufficient and the component holding patch 15 may be damaged. . Here, when the 100% modulus (M100) is larger than “3.4”, the end portion angle (α) is smaller than 6 degrees, so that a defect (defective product) occurs in the component holding patch 15 at the time of manufacturing. May end up.

  Next, in step 40, based on the 100% modulus that is the elastic modulus of the component holding patch 15 set in the elastic modulus setting step (step 20), the patch thickness (t) that is the thickness of the component holding patch 15 is set. The thickness setting process to set is performed.

  In this thickness setting step, either when the end angle is set smaller than 90 degrees (when an acute angle is set) or when the end angle is 90 degrees (when an obtuse angle is set) Also, the patch thickness (t) is set within a range of 2 to 10 mm.

  If the patch thickness (t) is less than 2 mm, the component holding patch 15 is too thin to absorb the deformation of the tread portion 9 due to the rolling of the pneumatic tire 1, and the component holding patch 15 is peeled off. It may become easy and the to-be-attached component 13 (electronic device 13A) may be damaged. On the other hand, if the patch thickness (t) is thicker than 10 mm, the mass of the component holding patch 15 increases, which may adversely affect the balance of the pneumatic tire 1.

  In the thickness setting process, when the end angle set in the end angle setting process (step 30) is 90 degrees (when the obtuse angle is set), the thickness of the fold extends from the outer periphery of the component holding patch. Set the pleat thickness.

  Specifically, when the end portion angle is 90 degrees (when the obtuse angle is set), the fold thickness is “h”, the mass of the mounted component is “g”, and the 100% modulus of the component holding patch is “M100”. Then, the fold thickness (h) is set within a range calculated by 0.5 ≦ h ≦ 3.8−1.5 × M100 and 0.2 × g / 5 ≦ M100. Even when this obtuse angle is set, the patch thickness (t) is set to 2 to 10 mm as described above.

  If the fold thickness (h) is less than 0.5 mm in the obtuse angle setting, the component holding patch 15 may be too thin and a defect (defective product) may occur in the component holding patch 15 during manufacturing. At the same time, the strength of the component holding patch 15 itself may be insufficient. On the other hand, when the fold thickness (h) is thicker than the value calculated by “3.8−1.5 × M100”, the component holding patch 15 is deformed by the deformation of the tread portion 9 accompanying the rolling of the pneumatic tire 1. It may not be possible to follow and deform.

  In addition, when the obtuse angle is set, if the 100% modulus (M100) is smaller than “0.2 × g / 5”, the strength of the component holding patch 15 itself is insufficient and the component holding patch 15 is damaged. Sometimes. Here, when the 100% modulus (M100) is larger than “2.2”, the fold thickness (h) is smaller than 0.5 mm, so that a defect (defective product) occurs in the component holding patch 15 during manufacturing. May end up.

(Action / Effect)
According to the patch design method according to the present embodiment described above, the component holding is performed by performing the elastic modulus setting step (step 20), the end angle setting step (step 30), and the thickness setting step (step 40). Based on the elastic modulus (100% modulus) of the patch 15, the shape (end angle (α), patch thickness (t), fold thickness (h)) of the component holding patch 15 can be set. It is possible to design the component holding patch 15 that is more difficult to peel off while ensuring the strength required for holding the mounted component 13 such as the device 13A.

[Other embodiments]
As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention.

  Specifically, the side surface 15C of the component holding patch 15 has been described as being planar, but the present invention is not limited to this. For example, as shown in FIG. May be curved toward the outside, or may be curved toward the outside of the component holding patch 15 as shown in FIG. In this case, the end portion angle (α) indicates an angle of a portion 3 mm from the end portion 15a.

  In addition, the component holding patch 15 (attached component 13) has been described as being a square, but is not limited to this, for example, as shown in FIGS. 8A to 8D, In the top view of the component holding patch 15, the shape may be a rectangle, a rhombus, a circle, an ellipse, or the like.

  Moreover, although the component holding patch 15 was demonstrated as what fixes the to-be-attached component 13 with an adhesive agent or a double-sided tape (what is called a pedestal type patch), it is not limited to this. For example, as shown in FIG. 9, the component holding patch 15 embeds the mounted component 13 inside (a so-called self-contained patch), or covers the mounted component 13 with a belt-shaped member 19 as illustrated in FIG. 10. Of course, it may be a thing (a so-called cover-type patch), and may be anything as long as it fixes the mounted part 13.

  Moreover, although the to-be-attached component 13 and the component holding patch 15 demonstrated as what was further provided in the tire radial inside of the inner liner 7 located inside the tire radial direction of the belt layer 11, it is limited to this. Instead, for example, the inner liner 7 located on the inner side in the tread width direction of the bead portion may be further provided on the inner side in the tread width direction, and provided on the inner side surface (inner liner 9) of the pneumatic tire 1. Of course it is good.

  Further, although the pneumatic tire 1 has been described as a radial tire including the bead portion 3 and the carcass layer 5, the pneumatic tire 1 is not limited to this and may be a bias tire or the like.

  From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art. 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.

  Next, in order to further clarify the effects of the present invention, the results of tests performed using pneumatic tires according to the following comparative examples and examples will be described. In addition, this invention is not limited at all by these examples.

  First, see Tables 1 and 2 for the adhesiveness between the component holding patch and the inner surface of the pneumatic tire and the high-speed durability of the component holding patch itself in a pneumatic tire with different end angle (α). While explaining. In addition, the data regarding each pneumatic tire were measured on the conditions shown below.

・ Tire size: 205 / 65R16
-Size of mounted parts: 30mm x 20mm x 5mm
-Size of component holding patch: Top surface 30mm x 20mm, thickness 5mm
A method for attaching the mounted part to the inner surface (inner liner) of the pneumatic tire will be briefly described. First, the fixing surface of the component holding patch is buffed by a glider to roughen the fixing surface. And a fixed surface and to-be-attached components are pasted together using a chloroprene adhesive (Sumitomo 3M company make: EC-1368NT), and 48 hours or more are passed.

  Similarly, the inner side surface (inner liner) of the pneumatic tire to which the part to be attached is attached is buffed by a glider to roughen the inner side surface. Then, the buff powder is removed and pasted together using a chloroprene adhesive (manufactured by Sumitomo 3M: EC-1368NT) and allowed to elapse for 48 hours or more.

The fixing means between the mounted member and the component holding patch and the fixing means between the component holding patch and the inner peripheral surface of the pneumatic tire are not limited to chloroprene-based adhesives, but double-sided tape (Sumitomo 3M). Company: Beta tape 4402 or acrylic foam structure bonding tape Y-4604). In addition to fixing the attached component and the component holding patch with an adhesive (so-called pedestal type patch), the attached component 13 is embedded in the component holding patch (so-called encapsulated patch), What attaches the attachment component 13 with the strip | belt-shaped member of a component holding patch (what is called a cover type patch) may be sufficient.

<Adhesiveness>
Each pneumatic tire is mounted on a test drum, and an adhesive portion between the component holding patch and the inner surface of the pneumatic tire is checked every about 5000 km, and the adhesiveness of the pneumatic tire according to Comparative Example 1 (conventional example) is confirmed. (Calculating the mileage when the bonded portion did not peel off) was set to “100”, and the adhesiveness of other pneumatic tires was indexed. In addition, it is excellent in adhesiveness, so that an index | exponent is large.

  As a result, it was found that the pneumatic tires according to Examples 1 to 11 were superior in adhesion between the component holding patch and the inner surface of the pneumatic tire as compared with the pneumatic tires according to Comparative Examples 1 to 7. . That is, it was found that the adhesiveness between the component holding patch and the inner surface of the pneumatic tire is improved by setting the end angle (α) based on the 100% modulus of the component holding patch.

<High-speed durability of the patch itself>
Each pneumatic tire was mounted on a test drum and rotated at a speed of 260 km / h according to a high-speed performance test in accordance with JIS D4230 to determine whether or not a failure occurred in the component holding patch of each pneumatic tire. A case where no failure such as melting or cracking occurs is indicated by “◯”, and a case where a failure occurs is indicated by “X”.

  As a result, it was found that the pneumatic tires according to Examples 1 to 11 were superior to the pneumatic tires according to Comparative Examples 2 and 4 in the high-speed durability of the component holding patch itself. That is, it was found that the high-speed durability of the component holding patch itself is improved by setting the end angle (α) based on the 100% modulus of the component holding patch.

Next, the high-speed durability of the component holding patch itself in the pneumatic tire in which the mass of the mounted component is changed will be described with reference to Table 3.

<High-speed durability of the component holding patch itself>
Similar to the above-described test, each pneumatic tire was mounted on a test drum and rotated at a speed of 260 km / h according to a high-speed performance test in accordance with JIS D4230, and a failure occurred in the component holding patch of each pneumatic tire. Whether or not. A case where no failure such as melting or cracking occurs is indicated by “◯”, and a case where a failure occurs is indicated by “X”.

  As a result, it was found that the pneumatic tires according to Examples 8, 12, and 13 were superior to the pneumatic tires according to Comparative Examples 8 and 9 in the high-speed durability of the component holding patch itself. That is, it was found that the high-speed durability of the component holding patch itself is improved by setting the elastic modulus (100% modulus) of the component holding patch based on the mass of the mounted component.

Next, with reference to Table 4, the high-speed durability of the component holding patch itself in the pneumatic tire in which the material of the component holding patch is changed and the high-speed durability (that is, the life) at the end of use of the component holding patch are described. explain.

<High-speed durability of the component holding patch itself>
Similar to the above-described test, each pneumatic tire was mounted on a test drum and rotated at a speed of 260 km / h according to a high-speed performance test in accordance with JIS D4230, and a failure occurred in the component holding patch of each pneumatic tire. Whether or not. A case where no failure such as melting or cracking occurs is indicated by “◯”, and a case where a failure occurs is indicated by “X”.

  As a result, it was found that the pneumatic tire according to Example 14 had high-speed durability of the component holding patch itself equivalent to the pneumatic tire according to Comparative Example 9.

<High-speed durability (ie, life) at the end of use of the component holding patch>
Each pneumatic tire was filled with air and stored for 30 days in an environment at a temperature of 60 degrees (set to the end-of-use (deteriorated) state). In the same manner as the test described above, each pneumatic tire is mounted on a test drum and rotated at a speed of 260 km / h according to a high speed performance test in accordance with JIS D4230. It was measured whether it occurred. A case where no failure such as melting or cracking occurs is indicated by “◯”, and a case where a failure occurs is indicated by “X”.

  As a result, it was found that the pneumatic tire according to Example 14 was superior to the pneumatic tire according to Comparative Example 9 in high-speed durability (that is, life) at the end of use of the component holding patch. That is, it was found that the high-speed durability at the end of use of the component holding patch is improved (the life is extended) by including butyl rubber in the component holding patch.

Here, 100% modulus cannot measure the modulus of the component holding patch itself. For this reason, using a rubber material for manufacturing a component holding patch, a plate-like rubber having a thickness of 2 mm was vulcanized and prepared in the same manner as the manufacturing time and temperature of the component holding patch. That is, the 100% modulus shown in Tables 1 to 4 is obtained by measuring the tensile stress (MPa) of the above-described sample at 100% elongation at room temperature (23 ± 2 degrees) according to JIS K6251-1993. Moreover, the 100% modulus shown in Tables 1-4 was calculated | required by the mixing | blending of the rubber shown in Table 5, respectively.

  Next, regarding the adhesiveness between the component holding patch and the inner surface of the pneumatic tire in the pneumatic tire in which the pleat thickness extending from the component holding patch is changed, and the high speed durability of the component holding patch itself This will be described with reference to Table 6. In addition, the data regarding each pneumatic tire were measured on the conditions shown below.

・ Tire size: 205 / 65R16
-Size of mounted parts: 30mm x 20mm x 5mm
・ Mass of mounted parts: 5g
-Size of component holding patch: Top surface 30mm x 22mm x thickness 5mm
・ Fold size: Width 5mm (3-10mm may be used)
In each pneumatic tire, in order to use the component holding patch used in the above-described test, a fold extending from the component holding patch was provided in the component holding patch, and the following test was performed.

That is, the test was performed by changing the fold thickness, which is the thickness of the fold extending from the outer periphery of the component holding patch, without changing the patch thickness of each component holding patch. The method for attaching the attached component to the inner surface of the pneumatic tire is as described above.

<Adhesiveness>
Each pneumatic tire is mounted on a test drum, and after every 5,000 km traveling, the adhesion portion between the fold (part holding patch) and the inner surface of the pneumatic tire is confirmed, and the pneumatic tire according to Comparative Example 1 (conventional example) The adhesiveness of other pneumatic tires was indexed with the adhesiveness (calculated mileage when there was no peeling of the adhesive portion) of “100”. In addition, it is excellent in adhesiveness, so that an index | exponent is large.

  As a result, the pneumatic tire according to Examples 1 to 5 is superior to the pneumatic tire according to Comparative Examples 1 to 9 in adhesion between the pleat (part holding patch) and the inner surface of the pneumatic tire. I understood. That is, it has been found that the adhesiveness between the crease and the inner surface of the pneumatic tire is improved by setting the crease thickness based on the crease 100% modulus.

<High-speed durability of the component holding patch itself>
Each pneumatic tire is mounted on a test drum and rotated at a speed of 260 km / h according to a high-speed performance test in accordance with JIS D4230 to determine whether or not a failure has occurred in the folds (part holding patches) of each pneumatic tire. It was measured. A case where no failure such as melting or cracking occurs is indicated by “◯”, and a case where a failure occurs is indicated by “X”.

  As a result, it was found that the pneumatic tires according to Examples 1 to 5 were superior to the pneumatic tires according to Comparative Examples 8 and 9 in the high-speed durability of the folds (part holding patches) themselves. That is, it was found that setting the fold thickness based on the 100% modulus of the fold improves the high speed durability of the fold itself.

Here, 100% modulus cannot measure the modulus of the component holding patch itself. For this reason, using a rubber material for manufacturing a component holding patch, a plate-like rubber having a thickness of 2 mm was vulcanized and prepared in the same manner as the manufacturing time and temperature of the component holding patch. That is, the 100% modulus shown in Table 6 is obtained by measuring the tensile stress (MPa) of the above-described sample at 100% elongation at room temperature (23 ± 2 degrees) according to JIS K6251-1993. The 100% modulus shown in Table 6 was determined by the rubber composition shown in Table 7.

It is a tread width direction sectional view showing the pneumatic tire concerning this embodiment. It is a perspective view which shows the to-be-attached component and component holding patch which concern on this Embodiment. It is a side view (A arrow line view of FIG. 2) which shows the to-be-attached component and component holding patch which concern on this Embodiment (the 1). It is a side view (A arrow view of FIG. 2) which shows the to-be-attached component and component holding patch which concern on this Embodiment (the 2nd figure). It is a perspective view and side view which show the to-be-attached component and component holding patch which concern on this Embodiment (the 3). It is a flowchart which shows the patch design method which concerns on this Embodiment. It is a side surface enlarged view which shows the edge part of the component holding patch which concerns on other embodiment. It is a top view of the component holding patch which concerns on other embodiment. It is a perspective view which shows the to-be-attached component and component holding patch which concern on other embodiment (the 1). It is a perspective view which shows the to-be-attached component and component holding patch which concern on other embodiment (the 2).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pneumatic tire, 3 ... Bead part, 5 ... Carcass layer, 7 ... Inner liner, 9 ... Tread part, 11 ... Belt layer, 13 ... Mounted part, 13A ... Electronic device, 13B ... Case, 15 ... Part Holding patch, 15A ... fixed surface, 15B ... mounting surface, 15C ... side surface, 15a ... end, 17 ... pleat, 19 ... band-shaped member

Claims (8)

A patch design method for holding a mounted part to be attached to a pneumatic tire and designing a part holding patch formed of a predetermined elastic material,
An elastic modulus setting step for setting an elastic modulus of the component holding patch;
Based on the elastic modulus of the component holding patch set in the elastic modulus setting step, the angle at which the mounting surface attached to the inner side surface of the pneumatic tire in the component holding patch and the side surface adjacent to the mounting surface intersect An end angle setting step for setting an end angle,
And a thickness setting step of setting a patch thickness, which is a thickness of the component holding patch, based on the elastic modulus of the component holding patch set in the elastic modulus setting step.   The patch design method according to claim 1, wherein the elastic modulus of the component holding patch is 100% modulus.   The patch design method according to claim 1, wherein in the end angle setting step, the end angle is set to 90 degrees or less. In the elastic modulus setting step,
The patch design method according to claim 1, wherein an elastic modulus of the component holding patch is set based on a mass of the mounted component. In the end angle setting step,
Assuming that the end angle is 'α', the mass of the mounted component is 'g', and the 100% modulus of the component holding patch is 'M100', 6 ≦ α ≦ 57-15 × M100 and 0.3 Set the end angle within the range calculated by xg / 5 ≦ M100,
The patch design method according to claim 2, wherein in the thickness setting step, the patch thickness is set within a range of 2 to 10 mm. In the end angle setting step, the end angle is set to 90 degrees,
3. The patch design method according to claim 2, wherein in the thickness setting step, a fold thickness that is a fold thickness extending from an outer periphery of the component holding patch is set. In the thickness setting step,
Assuming that the fold thickness is 'h', the mass of the mounted part is 'g', and the 100% modulus of the part holding patch is 'M100', 0.5 ≦ h ≦ 3.8−1.5 × M100, and The patch design method according to claim 6, wherein the fold thickness is set within a range calculated by 0.2 × g / 5 ≦ M100.   The patch design method according to claim 1, wherein the component holding patch is formed of a material containing butyl rubber.

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