JP5770439B2 - tire - Google Patents

Description

  The present invention relates to a tire, and particularly relates to a tire in which a tire frame member is formed using a resin material.

  A tire mounted on a rim includes one bead in which a bead core is embedded, a sidewall connected to the bead, and a protruding piece connected to the sidewall. The tire is integrally formed of a polymer material and the protruding pieces are joined to each other. A reinforcing cord is continuously wound in the tire circumferential direction on the outer surface in the tire radial direction of the tread bottom portion of the tire body in a spiral manner on a tire body made of a pair of semi-annular tire pieces that can form a tread bottom portion A structure is disclosed in which at least one reinforcing layer and a tread rubber attached to the outside of the reinforcing layer are integrated by vulcanization in a vulcanization mold (see Patent Document 1).

JP-A-3-143701

  In the conventional example described above, the tire frame member (tire main body) is made of a polymer material. However, since the tire frame member is not reinforced with a carcass ply or the like, the side portion is used when climbing over a protrusion on the road surface. There is a concern that the deformation of the pinch will be excessive and pinch cut (pinched and broken) between the rim flange and the projection on the road surface. On the other hand, if the gauge of the side part is uniformly thickened, there is a concern that the rolling resistance increases due to an increase in tire mass or volume, and the ride comfort deteriorates due to the improvement of the rigidity of the side part.

  In consideration of the above facts, the present invention is capable of suppressing pinch cuts associated with excessive deformation of the side portion when climbing over the protrusion on the road surface without uniformly increasing the gauge of the side portion. Objective.

The invention according to claim 1 is a tire frame member that is formed using a resin material and that has a bead portion that is a fitting portion to a rim, a side frame portion that continues to the bead portion on both sides in the tire width direction, and the tire frame member The tread member disposed on the outer side in the tire diameter direction of the tire, and the tire width along the rim flange of the rim provided on the inner surface of the tire frame member with the bead portion fitted to the rim. The tire rim member is disposed on the inner side in the tire radial direction from the maximum width position of the tire frame member so as to include the inner surface side of the rim flange at a position in contact with the outermost portion in the tire width direction when deformed by falling outward in the direction. are continuously formed along the circumferential direction, a first reinforcement portion and a lateral surface formed in a protruding substantially triangular along the longitudinal surface and the tire width direction along the tire radial direction in the tire axial section Wherein provided on the inner surface of the tire frame member, the outer side in the tire radial direction than the maximum width position so as to include the position in the tire radial direction outer side of the first reinforcing portion, across the maximum width position and the first reinforcing portion in is disposed apart from, and is formed continuously along the tire circumferential direction, the horizontal along the vertical surface and the tire width direction along the tire radial direction is formed in a protruding substantially triangular in the tire axial section And a second reinforcing portion that supports the first reinforcing portion and the outermost portion in the tire width direction of the rim flange when the side portion gets over the protrusion on the road surface. Have.

  In the tire according to the first aspect, even if the side portion of the tire frame member formed using the resin material tends to be greatly deformed when getting over the protrusion on the road surface, the protrusion and the rim flange in the tire width direction are the maximum. Excessive deformation of the side portion is suppressed by supporting the first reinforcing portion and the second reinforcing portion between each other. For this reason, it is possible to suppress excessive deformation of the side portion when climbing over the protrusion on the road surface without uniformly increasing the gauge of the side portion.

Further , since the positions of the first reinforcing portion and the second reinforcing portion are appropriately set, the elasticity of the side portion is ensured and the first reinforcing portion and the second reinforcing portion are in contact with each other during normal traveling. Is suppressed. For this reason, a favorable riding comfort can be ensured.

The invention of claim 2 is the tire of claim 1, wherein the first reinforcement portion and at least one of the second reinforcing portion is integrally molded with the tire frame member.

In the tire according to claim 2 , an increase in manufacturing cost can be suppressed by integrally forming at least one of the first reinforcing portion and the second reinforcing portion with the tire frame member.

A third aspect of the present invention, in the tire according to claim 1, wherein at least one of the first reinforcing portion and the second reinforcing portion is bonded to the inner surface of the tire frame member.

In the tire according to claim 3 , at least one of the first reinforcing portion and the second reinforcing portion can be appropriately selected according to the tire specifications while using a common tire frame member. For this reason, it can suppress that the kind of metal mold | die for tire frame member shaping | molding increases, and can suppress manufacturing cost.

  As described above, according to the tire according to claim 1 of the present invention, the side portion is excessively deformed when getting over the protrusion on the road surface without uniformly increasing the gauge of the side portion. An excellent effect that pinch cut can be suppressed is obtained.

According to the tire of the second aspect , it is possible to obtain an excellent effect that an increase in manufacturing cost can be suppressed.

According to the tire of the third aspect , it is possible to obtain an excellent effect that the production cost can be suppressed by suppressing an increase in the types of molds for forming the tire frame member.

It is sectional drawing which shows the tire assembled | attached to the rim | limb. It is an expanded sectional view showing the positional relationship of the 1st reinforcement part and the 2nd reinforcement part in the tire assembled to the rim. An enlarged cross-sectional view showing a state in which the first reinforcing portion and the second reinforcing portion support each other between the protrusion and the outermost portion in the tire width direction of the rim flange when the tire gets over the protrusion on the road surface. It is.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In FIG. 1, the tire 10 according to the present embodiment includes a tire frame member 12, a tread member 14, a first reinforcing portion 21, and a second reinforcing portion 22.

(Tire frame member)
The tire frame member 12 is formed using a thermoplastic material that is an example of a resin material, and includes a pair of bead portions 18 that serve as fitting portions to the rim 16, side portions 26 that are continuous with the bead portions 18, The outer circumferential end of the portion 26 in the tire radial direction is shaped to have a crown portion 24 that connects the tire width direction in the tire width direction.

  A bead core 28 is embedded in the pair of bead portions 18. As the material of the bead core 28, for example, metal, organic fiber, organic fiber coated with resin, or hard resin is used. The bead core 28 may be omitted if the rigidity of the bead portion 18 is ensured and there is no problem in fitting with the rim (not shown).

  As the thermoplastic material, a thermoplastic resin having a rubber-like elasticity, a thermoplastic elastomer (TPE), or the like can be used. However, considering the elasticity at the time of travel and the moldability at the time of manufacture, the thermoplastic elastomer is It is desirable to use it.

  Examples of the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), styrene-based thermoplastic elastomer (TPS) specified in JIS K6418, Examples thereof include urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), and other thermoplastic elastomers (TPZ).

  Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, polyamide resin, and the like.

  Furthermore, as these thermoplastic materials, for example, the deflection temperature under load specified at ISO 75-2 or ASTM D648 (at the time of 0.45 MPa load) is 78 ° C. or higher, the tensile yield strength specified by JIS K7113 is 10 MPa or higher, Similarly, the tensile yield elongation specified by JIS K7113 is 10% or more, the tensile fracture elongation specified by JIS K7113 is 50% or more, and the Vicat softening temperature (Method A) specified by JIS K7206 is 130 ° C or more. Things can be used.

  The tire skeleton member 12 is first molded into, for example, an injection-molded shape, for example, in the center of the tire 10 in the tire width direction, that is, the tire equator plane CL, or the vicinity thereof. It is comprised by joining edge parts. For this joining, for example, a joining member 30 such as the same or different thermoplastic material or adhesive is used.

  A reinforcing cord 32 is wound around the crown portion 24 in, for example, a spiral shape. As the cord 32, for example, a steel cord, a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers may be used. When a steel cord is used as the cord 32, for example, a sheet (not shown) made of a thermoplastic material is attached to the outer side of the crown portion 24 in the tire diameter direction, and the cord 32 is heated while the cord 32 is heated. It can be buried by spiral winding in the circumferential direction. At this time, both the cord 32 and the sheet may be heated.

  As described above, the reinforcing cord 32 is spirally wound around the crown portion 24 in the tire circumferential direction to improve the rigidity of the crown portion 24 in the tire circumferential direction and to prevent the crown portion 24 from breaking. Can be improved. In addition, this can improve the puncture resistance in the crown portion 24 of the tire 10. When reinforcing the crown portion 24, it is preferable to wind the cord 32 spirally in the tire circumferential direction because it is easy to manufacture, but the cord 32 may be discontinuous in the tire width direction. Further, a further reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric) is embedded in the tire frame member 12 (for example, the bead portion 18, the side portion 26, the crown portion 24, etc.) The tire frame member 12 may be reinforced with a reinforcing material.

(Tread material)
The tread member 14 is a PCT (Pre-Cured Tread) that is disposed on the outer side in the tire diameter direction of the tire frame member 12 and is made of, for example, rubber. As the rubber, for example, SBR (styrene-butadiene rubber) is used. Further, the tread member 14 may be made of a resin material.

  A tread pattern having a circumferential main groove 34, a horizontal main groove (not shown), and the like is formed on the grounding surface 14A side of the tread member 14. In order to form this tread pattern, unvulcanized rubber is vulcanized in a PCT mold to form the tread member 14. At this time, the tread member 14 has a vulcanization degree higher than the vulcanized state or the unvulcanized state that has reached the vulcanization degree required for the final product, but the vulcanization required for the final product. The semi-vulcanized state is not reached.

  An adhesive member 36 is disposed between the tread member 14 and the outer peripheral surface 12 </ b> A of the tire frame member 12, and the tread member 14 is bonded to the outer peripheral surface 12 </ b> A of the tire frame member 12 by the adhesive member 36. When the tread member 14 is disposed on the outer periphery of the tire frame member 12, the belt-like tread member 14 may be wound in an annular shape, or the tread member 14 previously formed in an annular shape may be temporarily The diameter of the tire frame member 12 may be increased to the outer peripheral surface 12 </ b> A of the tire frame member 12.

  The bonding member 36 is, for example, unvulcanized rubber, and the tread member 14 can be bonded to the outer peripheral surface 12A of the tire frame member 12 by vulcanization bonding. Prior to the bonding of the tread member 14, the bonding member 36 is disposed on at least one of the outer peripheral surface 12 </ b> A of the tire frame member 12 and the inner peripheral surface 14 </ b> B of the tread member 14. Note that an uneven portion (not shown) is provided in advance on the outer peripheral surface 12A of the tire frame member 12 so that the adhesive member 36 fits into the uneven portion when the outer peripheral surface 12A and the tread member 14 are bonded. It is preferable to make it.

  When the adhesive member 36 is disposed on the outer peripheral surface 12A of the tire frame member 12, it is preferable to apply, for example, one or two layers of another adhesive (not shown) to the outer peripheral surface 12A. Similarly, when the adhesive member 36 is disposed on the inner peripheral surface 14B of the tread member 14, for example, one or two layers of another adhesive (not shown) are preferably applied to the inner peripheral surface 14B. . The adhesive is preferably applied in an atmosphere with a humidity of 70% or less. Although this adhesive is not limited to a specific kind, for example, a triazine thiol-based adhesive can be used, and a chlorinated rubber adhesive, a phenol resin adhesive, an isocyanate adhesive, a halogen A rubberized adhesive or the like can also be used.

  Further, it is preferable that the surface to be coated with the adhesive (the outer peripheral surface 12A of the tire frame member 12 and the inner peripheral surface 14B of the tread member 14) is previously buffed with sandpaper or a grinder. This is because the adhesive is more easily attached. Furthermore, it is preferable to degrease the surface after buffing by washing with alcohol or the like. Further, it is preferable to perform corona treatment or ultraviolet irradiation treatment on the surface after buffing.

  When the tread member 14 is disposed on the outer side in the tire diameter direction of the adhesive member 36 after the adhesive member 36 is disposed on the outer peripheral surface 12A of the tire skeleton member 12, the inner peripheral surface 14B side of the tread member 14 or the adhesive For example, a rubber cement composition (not shown) having adhesiveness is preferably applied to the outer peripheral surface side of the member 36. This is because when the tread member 14 is attached to the adhesive member 36, the tread member 14 is temporarily fixed, and the workability is improved.

  When SBR (styrene-butadiene rubber) is used as the material of the tread member 14, it is preferable to use, for example, SBR splice cement as the rubber cement composition. Further, when an SBR rubber having a high NR (natural rubber) compounding ratio is used as the material of the tread member 14, it is preferable to use a material in which BR (butadiene rubber) is blended with an SBR splice cement. In addition, as the rubber cement composition, it is possible to use a solventless cement containing a liquid elastomer such as liquid BR or a cement mainly composed of a blend of IR (isoprene rubber) -SBR.

(1st reinforcement part and 2nd reinforcement part)
1 and 2, the first reinforcing portion 21 is provided on the inner surface 12B of the tire frame member 12, and the side portion 26 is attached to the rim flange 16F of the rim 16 with the bead portion 18 fitted to the rim 16. It is arranged so as to include the inner surface 12B side of the rim flange 16F at a position in contact with the outermost portion B in the tire width direction when being deformed by falling outward in the tire width direction. This 1st reinforcement part 21 is continuously formed along the tire circumferential direction as a projection-shaped thick part, for example.

  Here, the position of the rim flange 16F that contacts the outermost portion B in the tire width direction in the tire frame member 12 is a tire shaft in a state where the tire 10 is assembled to the rim 16 and a normal internal pressure is applied, as shown in FIG. In the direction cross section, the contour length from the rim separation point A where the rim 16 is separated from the tire 10 to the outermost portion B in the tire width direction of the rim flange 16F is L, and the rim 16 extends from the rim separation point A along the outer surface of the tire frame member 12. The point C is the length L.

  The 1st reinforcement part 21 is arrange | positioned so that the normal line N in the point C in the inner surface 12B side of this point C, ie, the outer surface of the tire frame member 12, and the intersection D of the outline M of the inner surface 12B may be included. . Further, the first reinforcing portion 21 is disposed on the inner side in the tire radial direction from the maximum width position E of the tire frame member 12. In the cross section shown in FIG. 2, the first reinforcing portion 21 has a vertical surface 21A along the tire radial direction and a horizontal surface 21B along the tire width direction, and is formed in, for example, a substantially triangular cross section. ing.

  The rim 16 refers to a standard rim in an applicable size defined in the 2010 YEAR BOOK issued by JATMA, for example. Similarly, the “regular internal pressure” refers to the air pressure with respect to the maximum load in the applicable size / ply rating defined in the 2010 YEAR BOOK issued by JATMA.

  When the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards are followed.

  Next, the 2nd reinforcement part 22 is provided in the inner surface 12B of the tire frame member 12, and is arrange | positioned so that the position of the tire radial direction outer side of the 1st reinforcement part 21 may be included. This 2nd reinforcement part 22 is continuously formed along a tire peripheral direction, for example as a projection-shaped thick part. In the cross section shown in FIG. 2, the second reinforcing portion 22 has a vertical surface 22A along the tire radial direction and a horizontal surface 22B along the tire width direction, and is formed in, for example, a substantially triangular cross section. ing. Further, the second reinforcing portion 22 is disposed away from the first reinforcing portion 21 on the outer side in the tire radial direction from the maximum width position of the tire frame member 12.

  “The second reinforcing portion 22 is disposed so as to include a position on the outer side in the tire radial direction of the first reinforcing portion 21” means that at least a part of the lateral surface 22B of the second reinforcing portion 22 is the first reinforcing portion. 21 overlaps with the lateral surface 21B of the tire 21 in the tire radial direction.

  When the tire 10 gets over the protrusion 40 (see FIG. 3) on the road surface, the sizes of the first reinforcing portion 21 and the second reinforcing portion 22 are considered in consideration of variations in the position, direction, etc. with which the protrusion 40 contacts. It is desirable to have a certain width.

(Arrangement method of the 1st reinforcement part and the 2nd reinforcement part)
At least one of the first reinforcing portion 21 and the second reinforcing portion 22 is integrally formed with the tire frame member 12. In the present embodiment, both the first reinforcing portion 21 and the second reinforcing portion 22 are integrally formed with the tire frame member 12.

  In addition, you may make it adhere | attach at least one of the 1st reinforcement part 21 and the 2nd reinforcement part 22 on the inner surface 12B of the tire frame member 12. FIG.

  Specifically, the following may be considered as a method of providing the first reinforcing portion 21 and the second reinforcing portion 22 on the inner surface 12B of the tire frame member 12.

  In the first method, a shape corresponding to the first reinforcing portion 21 and the second reinforcing portion 22 is added to a mold for injection-molding the half-shaped tire skeleton member 12, and a half-shaped tire is formed. When the skeleton member 12 is formed, the first reinforcing portion 21 and the second reinforcing portion 22 are integrally formed. In the illustrated example, both the first reinforcing portion 21 and the second reinforcing portion 22 are integrally formed with the tire frame member 12, and the material is also common. Thus, by integrally molding the first reinforcing portion 21 and the second reinforcing portion 22 with the tire frame member 12, an increase in manufacturing cost can be suppressed.

  The second method is to integrate the half-shaped tire frame member 12 with the first reinforcing portion 21 and the second reinforcing portion 22 by two-color molding or insert molding. In this case, as the material of the first reinforcing portion 21 and the second reinforcing portion 22, a material different from the material of the tire frame member 12, for example, a resin, rubber, or metal having higher rigidity than the material of the tire frame member 12 can be used.

  In the third method, a pre-injection-molded resin or press-vulcanized rubber is bonded to the inner surface 12B of the half-shaped tire skeleton member 12, and the first reinforcing portion 21 and the second reinforcing portion 22 are bonded. It is said that.

  In the fourth method, the first reinforcing portion 21 and the second reinforcing portion 22 are bonded to the inner surface 12B of the tire frame member 12 in which the half-shaped crown portions 24 are joined to each other by the resin or rubber in the third method. It is said that.

  In the third method and the fourth method, it is possible to appropriately select at least one specification of the first reinforcing portion 21 and the second reinforcing portion 22 according to the specification of the tire 10 while using the common tire frame member 12. it can. For this reason, it can suppress that the kind of metal mold | die for shaping | molding of the tire frame member 12 increases, and can suppress manufacturing cost.

  The first to fourth methods may be used alone or in appropriate combination. For example, the first reinforcing portion 21 may be integrally formed with the tire frame member 12 by the first method, and the second reinforcing portion 22 may be bonded by the third method.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 3, in the tire 10 according to the present embodiment, even if the side portion 26 of the tire frame member 12 formed using a resin material tends to be greatly deformed when getting over the projection 40 on the road surface, the projection 40 And the rim flange 16F between the outermost portion B in the tire width direction, the first reinforcing portion 21 and the second reinforcing portion 22 support each other, so that excessive deformation of the side portion 26 is suppressed. For this reason, the pinch cut accompanying the excessive deformation | transformation of this side part 26 at the time of getting over the protrusion 40 of a road surface can be suppressed, without making the gauge of the side part 26 uniform.

  Moreover, in this embodiment, the 1st reinforcement part 21 is arrange | positioned inside the tire diameter method rather than the maximum width position E of the tire frame member 12, and the 2nd reinforcement part 22 is a tire radial direction outer side from this maximum width position E. Since the first reinforcing portion is spaced apart from the first reinforcing portion, the elasticity of the side portion 26 is ensured and the contact between the first reinforcing portion 21 and the second reinforcing portion 22 during normal travel is suppressed. . For this reason, a favorable riding comfort can be ensured.

  Furthermore, the gauge of the side part 26 can be set thinner by providing the 1st reinforcement part 21 and the 2nd reinforcement part 22, and improving the pinch cut-proof property with respect to the protrusion 40 of a road surface. For this reason, it is possible to reduce the rolling resistance by reducing the tire mass and volume, or to improve the riding comfort by suppressing the rigidity of the side portion.

  Further, as in the present embodiment, by arranging the first reinforcing portion 21 and the second reinforcing portion 22 on the inner surface 12B of the tire frame member 12, the rim assembly property is also good. In a general rubber tire that is vulcanized and molded using a bladder (not shown), it is difficult to provide portions such as the first reinforcing portion 21 and the second reinforcing portion 22 on the inner surface, but as in this embodiment, When a resin material is used for the tire frame member 12, the first reinforcing portion 21 and the second reinforcing portion 22 can be provided on the inner surface 12B relatively easily.

  In addition, in the said embodiment, although the 1st reinforcement part 21 and the 2nd reinforcement part 22 shall be continuously arrange | positioned in the tire circumferential direction, it is not restricted to this, It arrange | positions intermittently in a tire circumferential direction. You may do it. Moreover, although the shape of the 1st reinforcement part 21 and the 2nd reinforcement part 22 in a tire axial cross section shall be substantially triangular, respectively, it is not restricted to this. When the tire 10 gets over the protrusion 40 on the road surface, the shape may be a shape that can support each other so that the two side portions 26 are folded and the inner surfaces 12B of the tire frame members 12 do not directly contact each other. That is, it is only necessary that the tire frame member 12 swells inside the tire from the contour line M of the inner surface 12B of the tire frame member 12.

DESCRIPTION OF SYMBOLS 10 Tire 12 Tire frame member 12B Inner surface 14 Tread member 16 Rim 16F Rim flange 18 Bead part 21 1st reinforcement part
21A vertical surface
21B lateral surface 22 2nd reinforcement part
22A vertical surface
22B side surface 26 Side B B Outermost part in the tire width direction C Point E Maximum width position

Claims (3)

A bead portion formed using a resin material and serving as a fitting portion to the rim; and a tire frame member having side portions continuous to the bead portion on both sides in the tire width direction;
A tread member disposed outside the tire skeleton member in the tire diameter direction;
Provided on the inner surface of the tire frame member,
A position where the side portion comes into contact with the outermost portion in the tire width direction of the rim flange when the side portion is tilted outwardly in the tire width direction along the rim flange of the rim with the bead portion fitted to the rim. Is disposed on the inner side in the tire radial direction from the maximum width position of the tire frame member so as to include the inner surface side of
And continuously formed along the tire circumferential direction ,
A first reinforcing portion formed in a substantially triangular projection shape in a cross section in the tire axial direction and having a vertical surface along the tire radial direction and a horizontal surface along the tire width direction ;
Provided on the inner surface of the tire frame member,
The first reinforcing portion is disposed on the outer side in the tire radial direction from the maximum width position so as to include the position on the outer side in the tire radial direction of the first reinforcing portion, and spaced apart with the first reinforcing portion and the maximum width position interposed therebetween .
And continuously formed along the tire circumferential direction,
Protrusions formed in a substantially triangular shape in a cross section in the tire axial direction, having a vertical surface along the tire radial direction and a horizontal surface along the tire width direction, and the side portion gets over the protrusion on the road surface And a second reinforcing part that supports the first reinforcing part between the outermost part in the tire width direction of the rim flange ,
Tire with.   The tire according to claim 1, wherein at least one of the first reinforcing portion and the second reinforcing portion is integrally formed with the tire frame member.   The tire according to claim 1, wherein at least one of the first reinforcing portion and the second reinforcing portion is bonded to the inner surface of the tire frame member.

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