JP2018188069A - Pneumatic tire - Google Patents

Abstract

An accessory part can be attached directly to the inner surface of a tire while suppressing an increase in the number of parts. A pneumatic tire (10) includes a pair of bead portions (12) in which bead cores (20) are respectively embedded, a carcass (14) straddling the pair of bead portions (12) and having end portions (14A) engaged with the bead cores (20), and a carcass (14). It has a belt layer 16 provided outside in the tire radial direction and coated with a cord 28 with a resin 30, and a rubber inner liner 18 provided inside the carcass 14 in the tire radial direction for retaining internal pressure. , the resin 30 of the belt layer 16 is exposed to the inside of the tire through a through portion 32 passing through the carcass 14 and the inner liner 18, and an accessory can be attached to the exposed resin 30. [Selection drawing] Fig. 1

Description

  The present invention relates to a pneumatic tire.

  In a pneumatic tire, a structure is disclosed in which a mechanical fastener is installed on the inner surface of a tire and various objects can be attached to the inner surface of the tire via the mechanical fastener (see Patent Document 1). The mechanical fastener is configured by sandwiching a resin reinforcing body between two or more fastener constituent members. The resin reinforcing body is vulcanized and bonded to the inner surface of the tire, or is fixed to the inner surface of the tire via an adhesive layer at the boundary between the resin reinforcing body and the tire inner surface.

JP 2016-34801 A

  However, in the above-described conventional example, since the resin reinforcing body is used, the number of parts is increased and the cost is increased.

  An object of the present invention is to make it possible to directly attach accessory parts to the inner surface of a tire while suppressing an increase in the number of parts.

  The first aspect includes a pair of bead portions each having a bead core embedded therein, a carcass straddling the pair of bead portions, and an end portion locked to the bead core, and a tire radial direction outer side of the carcass, A belt layer in which a cord is coated with a resin, and a rubber inner liner that is provided on an inner side in a tire radial direction of the carcass and holds an internal pressure, and the resin of the belt layer includes the carcass and It is exposed to the inside of the tire through a penetrating portion that penetrates the inner liner, and is configured such that an accessory can be attached to the exposed resin.

  In this pneumatic tire, the resin that covers the cord of the belt layer is exposed to the inside of the tire through a through portion that penetrates the carcass and the inner liner. Even if such a penetration portion is provided, the airtightness of the tire is maintained by the resin. This resin is easier to bond and weld compared to a rubber inner liner in which a release agent containing silicone remains on the surface. Therefore, it is possible to directly attach the accessory part to the tire inner surface while suppressing an increase in the number of parts. This can also prevent the accessory parts from falling off and improve productivity.

  According to a second aspect, in the pneumatic tire according to the first aspect, the resin of the belt layer enters the through portion and forms a pedestal portion for attaching the accessory part.

  In this pneumatic tire, since the pedestal is formed of resin, it is easier to attach the accessory parts.

  According to a third aspect, in the pneumatic tire according to the first aspect or the second aspect, the through portion is a through hole.

  In this pneumatic tire, since the through portion is a through hole, the position where the resin is exposed inside the tire is determined. That is, the attachment position of the accessory part can be accurately determined.

  According to a fourth aspect, in the pneumatic tire according to the first aspect or the second aspect, the penetration portion is continuous in the tire circumferential direction.

  In this pneumatic tire, since the through portion is continuous in the tire circumferential direction, the resin of the belt layer is also exposed continuously in the tire circumferential direction. Therefore, the accessory can be attached over a wide range in the tire circumferential direction.

  According to a fifth aspect, in the pneumatic tire according to any one of the first to fourth aspects, an accessory is attached to the exposed resin.

  Various functions can be imparted to the pneumatic tire by the attached parts attached to the exposed resin.

  According to the pneumatic tire of the present invention, it is possible to directly attach the accessory part to the tire inner surface while suppressing an increase in the number of parts.

It is sectional drawing which shows the pneumatic tire which concerns on this embodiment. It is an expanded sectional view which shows the base part formed with resin. It is sectional drawing which shows the state in which the accessory was attached to the base part. (A) It is a top view which shows the structure which the penetration part has continued in the tire circumferential direction in the tire inner surface. (B) It is a perspective view which shows the structure which resin does not penetrate in a through-hole in the tire inner surface.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the arrow C direction indicates the tire circumferential direction, the arrow R direction indicates the tire radial direction, and the arrow W direction indicates the tire width direction. The tire radial direction means a direction orthogonal to a tire rotation axis (not shown). The tire width direction means a direction parallel to the tire rotation axis. The tire width direction can be rephrased as the tire axial direction.

  The dimension measuring method of each part is based on the method described in the 2017 edition YEAR BOOK issued by JATMA (Japan Automobile Tire Association). When the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards are followed.

  In FIG. 1, the pneumatic tire 10 according to the present embodiment includes a pair of bead portions 12, a carcass 14, a belt layer 16, and an inner liner 18.

  A bead core 20 is embedded in each of the pair of bead portions 12. As a material constituting the bead core 20, a metal, an organic fiber, a material obtained by coating an organic fiber with a resin, a hard resin, or the like can be used.

  The carcass 14 straddles the pair of bead portions 12, and the end portion 14 </ b> A is locked to the bead core 20. The carcass main body portion 14B located between the end portions 14A of the carcass 14 passes through the side portion 22 and the crown portion 24. In the present embodiment, a portion from the inner end in the radial direction of the pneumatic tire 10 to 30% of the sectional height SH is referred to as a bead portion 12, and a portion where the tread 26 is disposed is referred to as a crown portion 24.

  The belt layer 16 is provided on the outer side in the tire radial direction of the carcass main body portion 14 </ b> B in the carcass 14, and the cord 28 is covered with the resin 30. The belt layer 16 is configured by a cord 28 covered with a resin 30 being spirally wound and joined to the outer periphery of the carcass 14 in the tire circumferential direction. Resins 30 adjacent to each other in the tire axial direction are also joined to each other. As the cord 28 used for the belt layer 16, for example, a steel cord can be used. A tread 26 is joined to the outer side of the belt layer 16 in the tire radial direction.

  As a material of the resin 30, a thermoplastic resin having the same elasticity as rubber, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used. In consideration of elasticity during running and moldability during production, it is desirable to use a thermoplastic elastomer.

  As thermoplastic elastomers, polyolefin-based thermoplastic elastomers (TPO), polystyrene-based thermoplastic elastomers (TPS), polyamide-based thermoplastic elastomers (TPA), polyurethane-based thermoplastic elastomers (TPU), polyester-based thermoplastic elastomers (TPC) And dynamic crosslinkable thermoplastic elastomer (TPV).

  Examples of the thermoplastic resin include polyurethane resin, polyolefin resin, vinyl chloride resin, polyamide resin and the like. Furthermore, as the thermoplastic material, for example, the deflection temperature under load (0.45 MPa load) specified in ISO75-2 or ASTM D648 is 78 ° C. or more, the tensile yield strength specified in JIS K7113 is 10 MPa or more, Similarly, those having a tensile fracture elongation (JIS K7113) defined by JIS K7113 of 50% or more and a Vicat softening temperature (Method A) defined by JIS K7206 of 130 ° C. or more can be used.

  The thermosetting resin refers to a polymer compound that forms and cures a three-dimensional network structure as the temperature rises, and examples thereof include a phenol resin, an epoxy resin, a melamine resin, and a urea resin.

  In addition to the above-mentioned thermoplastic resins (including thermoplastic elastomers) and thermosetting resins, resin materials include (meth) acrylic resins, EVA resins, vinyl chloride resins, fluorine resins, silicone resins, etc. General-purpose resin may be used.

  The inner liner 18 is a rubber member that is provided on the inner side in the tire radial direction of the carcass 14 and maintains internal pressure. The inner liner 18 constitutes substantially the entire inner surface of the tire except for a through portion 32 described later.

  As shown in FIGS. 1 to 3, the resin 30 of the belt layer 16 is exposed to the inside of the tire through a through portion 32 that penetrates the carcass 14 and the inner liner 18. The through portion 32 is a circular through hole provided at a position corresponding to the tire equatorial plane CL, for example. Regardless of whether or not the resin 30 exposed through the penetrating part 32 has entered the penetrating part 32, it constitutes a part of the tire inner surface. An attachment component 34 (FIG. 3) can be attached to the resin 30 exposed inside the tire. The accessory part 34 is an acceleration sensor, a temperature sensor, a microphone, a transmitter, or the like.

  In the example shown in FIGS. 1 to 3, the resin 30 of the belt layer 16 enters the through portion 32 and forms a pedestal portion 36 for attaching the accessory component 34 (FIG. 3). The accessory part 34 (FIG. 3) can be attached to the pedestal 36. The pedestal portion 36 is obtained by, for example, melting a part of the resin 30 and entering the through portion 32 and curing. The pedestal portion 36 may be configured by inserting a separate resin member into the penetrating portion 32 and bonding it to the resin 30 of the belt layer 16. The pedestal portion 36 is flush with the surface of the inner liner 18, but is not limited thereto, and may be formed to be recessed in the penetration portion 32. In other words, a configuration in which the resin 30 enters partway through the through portion 32 may be used.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 2, in the pneumatic tire 10 according to the present embodiment, the resin 30 that covers the cord 28 of the belt layer 16 is exposed to the inside of the tire through the through portion 32 that penetrates the carcass 14 and the inner liner 18. Even if such a penetration part 32 is provided, the airtightness of the tire is maintained by the resin 30. The resin 30 is easier to bond and weld compared to the rubber inner liner 18 where the release agent containing silicone remains on the surface.

  In this example, since the pedestal portion 36 that is flush with the surface of the inner liner 18 is formed by the resin 30 that has entered the penetrating portion 32, attachment of the accessory part 34 is further facilitated. In the example shown in FIG. 3, the attachment member 38 is fixed to the pedestal portion 36 by means such as adhesion or welding. The accessory part 34 is locked to the mounting member 38 and fixed to the inner surface of the tire.

  When the penetrating portion 32 is a through hole, the position where the resin 30 is exposed inside the tire is determined, so that the attachment position of the accessory part 34 can be accurately determined.

  In the present embodiment, by exposing the resin 30 to the inside of the tire, it is possible to directly attach the accessory part 34 to the tire inner surface while suppressing an increase in the number of parts. Further, productivity can be improved. Furthermore, since the attachment state of the accessory part 34 is stabilized, it is possible to prevent the accessory part 34 from falling off.

  Further, by attaching the accessory part 34 to the exposed resin, various functions can be imparted to the pneumatic tire 10.

[Other Embodiments]
As mentioned above, although an example of embodiment of this invention was demonstrated, embodiment of this invention is not limited above, In addition to the above, in a range which does not deviate from the main point, it can implement variously. Of course there is.

  In FIG. 1 to FIG. 3, the through portion 32 is a circular through hole. However, the through portion 32 is not limited to this and may be, for example, an elliptical or polygonal through hole.

  In the example shown in FIG. 4A, the through portion 32 is continuous in the tire circumferential direction. In this case, the through portion 32 may be continuous in the tire circumferential direction, may extend in a certain region, or may be formed intermittently. Since the through portion 32 is continuous in the tire circumferential direction, the resin 30 of the belt layer 16 is also continuously exposed in the tire circumferential direction. Therefore, the accessory part 34 (FIG. 3) can be attached over a wide range in the tire circumferential direction.

  The continuous penetration part 32 and the penetration part 32 (through-hole) shown by FIG. 2 may coexist.

  The resin 30 enters the penetration part 32 to form the pedestal part 36. However, as shown in FIG. 4B, the resin 30 does not enter the penetration part 32 and is exposed to the inside of the tire through the penetration part 32. It may be configured to.

  The position of the penetrating portion 32 is not limited to the position of the tire equatorial plane CL, and in consideration of the rigidity balance of the pneumatic tire 10, the position where the resin 30 of the belt layer 16 can be exposed, for example, inside the crown portion 24 as appropriate. Provided.

DESCRIPTION OF SYMBOLS 10 ... Pneumatic tire, 12 ... Bead part, 14 ... Carcass, 14A ... End part, 16 ... Belt layer, 18 ... Inner liner, 28 ... Cord, 30 ... Resin, 32 ... Penetration part, 34 ... Accessory part, 36 ... Pedestal

Claims (5)

A pair of bead portions each embedded with a bead core;
A carcass straddling the pair of bead portions and having an end portion locked to the bead core;
A belt layer provided on the outer side in the tire radial direction of the carcass and having a cord coated with a resin;
An inner liner made of rubber for maintaining the internal pressure, provided on the inner side in the tire radial direction of the carcass;
Have
The pneumatic tire is configured such that the resin of the belt layer is exposed to a tire inner side through a penetrating portion that penetrates the carcass and the inner liner, and an accessory can be attached to the exposed resin.   The pneumatic tire according to claim 1, wherein the resin of the belt layer enters the through portion and forms a pedestal portion for attaching the accessory part.   The pneumatic tire according to claim 1, wherein the through portion is a through hole.   The pneumatic tire according to claim 1, wherein the through portion is continuous in the tire circumferential direction.   The pneumatic tire according to any one of claims 1 to 4, wherein the accessory part is attached to the exposed resin.