阅读说明：本技术 充气轮胎 (Pneumatic tire ) 是由 田村将司 于 2018-06-29 设计创作，主要内容包括：为了通过加强构件加强侧壁部,并且抑制加强构件的脱落,充气轮胎(1)具备：侧壁部(5),位于轮胎宽度方向的两侧；胎圈部(20),位于侧壁部(5)的轮胎径向内侧；多个保护装置(30),在侧壁部(5)中的至少一方的侧壁部(5)的从胎圈部(20)的轮胎径向的内端部(25)向轮胎周向外侧,从侧壁部(5)的表面突出地设在轮胎剖面高度的30％以上70％以下的范围内,且沿轮胎周向延伸；以及多个螺旋状加强构件(40),形成为螺旋状,并且以螺旋的中心轴(CS)沿轮胎周向延伸的朝向配设于保护装置(30)的内部。(In order to reinforce a side wall portion by a reinforcing member and suppress the falling-off of the reinforcing member, a pneumatic tire (1) is provided with: side wall portions (5) located on both sides in the tire width direction; a bead portion (20) located on the inner side of the sidewall portion (5) in the tire radial direction; a plurality of protectors (30) which are provided on the inner end (25) of at least one side wall portion (5) of the side wall portions (5) in the tire radial direction of the bead portion (20) to the outside in the tire circumferential direction, protrude from the surface of the side wall portion (5), are provided within the range of 30% to 70% of the tire cross-sectional height, and extend in the tire circumferential direction; and a plurality of spiral reinforcing members (40) which are formed in a spiral shape and are arranged inside the protector (30) in a direction in which the center axis (CS) of the spiral extends in the tire circumferential direction.)

1. A pneumatic tire is characterized by comprising:

side wall portions located on both sides in a tire width direction;

a bead portion located on the tire radial direction inner side of the side wall portion;

a plurality of protectors provided in a range of 30% to 70% of a tire cross-sectional height from a surface of the sidewall portion so as to protrude outward in a tire circumferential direction from an inner end portion of the sidewall portion in a tire radial direction of the bead portion, and extending in the tire circumferential direction; and

and a plurality of spiral reinforcing members that are formed in a spiral shape and are disposed inside the protector in a direction in which a center axis of the spiral extends in the tire circumferential direction.

2. The pneumatic tire of claim 1,

the plurality of spiral reinforcing members are arranged in concentric circles around the center of the tire.

3. The pneumatic tire as claimed in claim 1 or 2, wherein

At least one spiral reinforcing member is disposed at any position on the tire circumference of the side wall portion on which the spiral reinforcing member is disposed.

4. The pneumatic tire according to claim 1, comprising:

an elastic reinforcing member covered by the spiral reinforcing member.

5. The pneumatic tire of claim 4,

the plurality of spiral reinforcing members and the elastic reinforcing member are arranged in concentric circles around the center of the tire.

6. The pneumatic tire according to claim 4 or 5,

at least one of the spiral reinforcing member and the elastic reinforcing member is disposed at any position on the tire circumference of the side wall portion where the spiral reinforcing member and the elastic reinforcing member are disposed.

7. The pneumatic tire according to any one of claims 4 to 6,

the elastic reinforcing member has a 100% modulus in a range of 5 to 25 times the 100% modulus of the rubber composition of the side wall portion adjacent to the spiral reinforcing member.

8. The pneumatic tire according to any one of claims 4 to 7,

the elastic reinforcing member has a breaking strength of 10MPa to 50MPa and an elongation at break of 150% or more.

9. The pneumatic tire according to any one of claims 1 to 8,

for the protection device, the shape of a meridian section of the pneumatic tire is a semicircle,

outer diameter of the helical reinforcing member

10. The pneumatic tire according to any one of claims 1 to 9,

the wire diameter of the spiral reinforcing member

Technical Field

The present invention relates to a pneumatic tire.

Background

In a pneumatic tire for a vehicle running on an unpaved road surface, stones or the like on the road surface often come into contact with the side wall portion during running of the vehicle, and the side wall portion is easily damaged. Therefore, in some conventional pneumatic tires, the side wall portion is reinforced to suppress damage to the side wall portion. For example, in the pneumatic tire described in patent document 1, a plurality of protection devices extending in the tire circumferential direction are formed by forming the side wall portions into a concave-convex shape, and the cut resistance is improved by providing a reinforcing layer made of organic fibers along the outer surface of the protection devices. In the pneumatic tire for a working vehicle described in patent document 2, at least two convex-shaped protector devices extending in the tire circumferential direction are provided on the side wall portion, and an elastic reinforcement is embedded in the protector devices, thereby enhancing the reinforcing effect of the protector devices.

Disclosure of Invention

Problems to be solved by the invention

However, as described in patent documents 1 and 2, in the case of a protector in which a reinforcing member made of a material different from the rubber material constituting the side wall portion is provided in the side wall portion, depending on the material of the reinforcing member, it may be difficult to ensure adhesiveness between the rubber materials. In this case, when stones or the like on the road surface come into contact with the protector, the reinforcing member may peel off from the rubber material and fall off from the side wall portion. When the reinforcing member comes off, the reinforcing effect of the side wall portion of the protector is greatly reduced, but it is effective to provide a reinforcing member made of a material different from the rubber material for reinforcing the side wall portion. Therefore, it is very difficult to arrange a reinforcing member effective for reinforcing the side wall portion and to suppress the detachment of the reinforcing member.

Further, as in patent document 2, when the reinforcing member of the protector disposed on the side wall portion is an elastic member, the reinforcing member may be deformed by a pressure during vulcanization molding when the green tire is vulcanization molded. Specifically, the reinforcing member may be deformed in a direction in which the thickness of the reinforcing member becomes thinner in the thickness direction of the side wall portion due to the pressure at the time of vulcanization molding. In this case, since the thickness of the reinforcing member becomes too thin, it may be difficult to suppress damage to the side wall portion caused when a stone or the like on the road surface comes into contact with the protection device by the reinforcing member. In this way, in the case where the elastic member is used as the reinforcing member of the protection device disposed on the side wall portion, the deformation of the reinforcing member has an effect on the reinforcement of the reinforcing member, but it is very difficult to dispose the reinforcing member on the side wall portion without deforming the reinforcing member made of the elastic member.

The present invention has been made in view of the above circumstances, and a first object thereof is to provide a pneumatic tire in which a side wall portion can be reinforced by a reinforcing member and detachment of the reinforcing member can be suppressed, and a second object thereof is to provide a pneumatic tire in which deformation of the reinforcing member having elasticity can be suppressed.

Technical scheme

In order to solve the above problems and achieve the above object, a pneumatic tire according to the present invention includes: side wall portions located on both sides in a tire width direction; a bead portion located on the tire radial direction inner side of the side wall portion; a plurality of protectors that are provided in a range of 30% to 70% of a tire cross-sectional height from a surface of the sidewall portion, protruding outward in the tire circumferential direction from an inner end portion of the sidewall portion in the tire radial direction of the bead portion, of at least one of the sidewall portions, and extend in the tire circumferential direction; and a plurality of spiral reinforcing members that are formed in a spiral shape and are disposed inside the protector in such a direction that a center axis of the spiral extends in the tire circumferential direction.

In the pneumatic tire, it is preferable that the plurality of spiral reinforcing members are arranged in concentric circles around a tire center.

In the pneumatic tire, it is preferable that one or more spiral reinforcing members be disposed at any position on the tire circumference of the side wall portion where the spiral reinforcing members are disposed.

In the pneumatic tire, it is preferable that the elastic reinforcing member is covered with the spiral reinforcing member.

In the pneumatic tire, it is preferable that the plurality of spiral reinforcing members and the plurality of elastic reinforcing members are arranged in concentric circles around a tire center.

In the pneumatic tire, it is preferable that one or more of the spiral reinforcing member and the elastic reinforcing member be disposed at any position on the tire circumference of the side wall portion where the spiral reinforcing member and the elastic reinforcing member are disposed.

In the pneumatic tire, it is preferable that the 100% modulus of the elastic reinforcing member is in a range of 5 to 25 times the 100% modulus of the rubber composition of the side wall portion adjacent to the spiral reinforcing member.

In the pneumatic tire, it is preferable that the elastic reinforcing member has a breaking strength in a range of 10MPa to 50MPa and an elongation at break of 150% or more.

In the pneumatic tire described above, it is preferable that, in the protector, a shape of a meridian cross section of the pneumatic tire is a semicircle, and an outer diameter of the spiral reinforcing member is larger than an outer diameter of the spiral reinforcing member

Diameter of the semicircle of the protection device

In the ratio of

Within the range of (1).

In the pneumatic tire, it is preferable that the spiral reinforcing member has a wire diameterIn that

Within the range of (1).

Effects of the invention

The pneumatic tire according to the present invention has a first effect of reinforcing the side wall portion by the reinforcing member and suppressing the detachment of the reinforcing member, and also has a second effect of suppressing the deformation of the reinforcing member having elasticity.

Drawings

Fig. 1 is a meridian cross-sectional view showing a main part of a pneumatic tire of embodiment 1.

Fig. 2 is a side view of the pneumatic tire as viewed in the direction a-a of fig. 1.

Fig. 3 is a detailed view of part B of fig. 1.

Fig. 4 is an explanatory view of the protector and the spiral reinforcing member in the case where the protector shown in fig. 3 is viewed in the C-C direction.

Fig. 5 is a side view of the helical reinforcing member shown in fig. 4 in a single body.

Fig. 6 is a meridian cross-sectional view showing a main part of a pneumatic tire of embodiment 2.

Fig. 7 is a detailed view of portion D of fig. 6.

Fig. 8 is an explanatory view of the protector, the spiral reinforcing member, and the elastic reinforcing member in the case where the protector shown in fig. 7 is viewed in the direction E-E.

Fig. 9 is a side view of the helical reinforcing member and the elastic reinforcing member shown in fig. 8.

Fig. 10 is a modification of the pneumatic tire according to embodiments 1 and 2, and is an explanatory diagram of a case where two protection devices are provided.

Fig. 11 is a diagram illustrating a modification of the pneumatic tire according to embodiments 1 and 2, in which a part of the protection device is not continuous.

Fig. 12 is a diagram illustrating a modification of the pneumatic tire according to embodiments 1 and 2, in which all the protection devices are not continuous.

Fig. 13A is a graph showing the results of the first performance evaluation test of the pneumatic tire.

Fig. 13B is a graph showing the results of the first performance evaluation test of the pneumatic tire.

Fig. 14A is a graph showing the results of the second performance evaluation test of the pneumatic tire.

Fig. 14B is a graph showing the results of the second performance evaluation test of the pneumatic tire.

Detailed Description

Hereinafter, embodiments of the pneumatic tire according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment. The components of the following embodiments include components that can be easily replaced and thought by those skilled in the art, or substantially the same components.