KR100980166B1 - Pneumatic tire reducing formation of dent or bulge - Google Patents

Abstract

The present invention relates to a pneumatic tire that suppresses the formation of dents and bulges in which a portion of the surface of the sidewall is pitted or convex during air injection.

In the pneumatic tire which reduces the occurrence of dents or bulges according to the present invention, the inner liner or carcass 10 is positioned such that the studs 21 are positioned between both ends of the inner liner or carcass 10 forming the joint structure. A male connector 20 disposed on one side of the one side; Female connector 30 disposed on the other side of the inner liner or carcass 10 so that the groove 31 corresponding to the stud 21 is located between both ends of the inner liner or carcass 10. And a surface of the male connector 20 and the female connector 30 in contact with both ends of the inner liner or carcass 10, and the contact surface of the stud 21 and the groove 31, At the time of tire shaping | molding, the tire cement is applied, respectively.

Dent, Bulge, Junction, Carcass, Inner Liner, Tire, Connector

Description

Pneumatic tire reducing formation of dent or bulge}

According to the present invention, a part of the surface of the sidewall is partially recessed during air injection by using a pair of male and female prefabricated connectors between both ends of the innerliner or the carcass 10 forming the bonded structure. A pneumatic tire of improved construction, which can effectively inhibit or reduce the formation of dents or the formation of partially convex bulges.

Inner tires and carcasses of tire components (semi-finished products) are wound around a molding drum to be molded, so that a joint structure of a predetermined width is necessarily formed at both ends.

By the way, as shown in FIG. 3, such a joining structure doubles the thickness compared with the other part (non-joined part) of this carcass 10, when both ends of carcass 10 are formed overlapping by predetermined width. Since the thickness is doubled and the stiffness is doubled, when air is injected into the tire, the air is inflated less than the unbonded portion so that a part of the surface of the side wall 60 is recessed (dentation 40 is generated). On the other hand, as shown in FIG. 4, when both ends do not overlap and leave a little gap, the surface part of the side wall 60 protrudes convexly (bulge 50 generate | occur | produces).

Whether dents or bulges are present, they deteriorate the tire appearance quality and worsen the uniformity of the tires.

The present invention relates to the above-mentioned conventional problems, that is, the dents that occur when both ends of the innerliner or both ends of the carcass overlap and the bulge that occurs when both ends of these semifinished products do not overlap and have a slight gap. It is an object of the present invention to provide a pneumatic tire of an improved structure, which can reduce the size or suppress the formation of such a dent or bulge itself.

The pneumatic tire of the present invention, which is designed to solve the above problems, is located on one side of the inner liner or carcass such that studs are positioned between both ends of the inner liner or both ends of the carcass forming the bonded structure. Male connectors arranged; A female connector disposed on the other side of the inner liner or carcass such that the groove corresponding to the stud is located between both ends of the inner liner or carcass; Characterized in that configured to include. In addition, when the tire is formed, a tire binder is applied to the surface of the male connector and the female connector in contact with both ends of the inner liner or both ends of the carcass, and a tire cement is also applied to the contact surface between the stud and the groove. Is applied.

When the male and female connectors are used for the carcass, these male and female pairs preferably have a mating height of 1.8 mm to 2.0 mm.

When male and female connectors are used for the innerliner, the engagement height is preferably 2.2 mm to 2.4 mm.

Further, it is preferable that these connectors provided in a male and female pair have a width of a flange portion of 5 mm to 10 mm overlapping both ends of the innerliner or both ends of the carcass.

In addition, as the material of the male connector and the female connector, it is preferable to use flexible rubber as compared to the inner liner or the carcass.

According to the pneumatic tire of the present invention configured as described above, both ends of the inner liner or both ends of the carcass are connected by butt connection through a thin connector made of a flexible rubber material provided in a pair of male and female. . As a result, when air is injected into the tire, there is no difference in the degree of expansion of both ends joined butt-bonded by the male and female connectors and the degree of expansion of the non-bonded portion of the semi-finished product. Does not occur or the degree is weakened.

In addition, as the surface of the sidewalls becomes smoother, the uniformity and appearance of the tire also improve.

Attached Figure 1 is an exemplary view showing a joint structure of both ends of the carcass 10 used in the pneumatic tire of the present invention, Figure 2 is coupled to the male and female pairs of connectors (20, 30) the longitudinal direction It is sectional drawing along the side.

As shown in these figures, the connectors for butt joining both ends of the innerliner or both ends of the carcass 10 are constituted by a male and female pair.

The male connector 20 and the female connector 30 may vary somewhat, but their length is equal to the width of the innerliner or carcass 10.

The male connector 20 is comprised by the joining board 22 which the block protruded in the lower surface center part, and the some stud 21 which protruded at equal intervals along the longitudinal direction of this block. The joining plate 22 and the stud 21 are integrally formed from a rubber that is more flexible than an inner liner (or carcass), for example.

The female connector 30 paired with the male connector 20 having the above configuration includes a bonding plate 32 having a block protruding from the upper surface center portion and a plurality of grooves 31 formed at equal intervals along the longitudinal direction of the block. It consists of. The female connector 30 is also molded integrally from the same rubber as the male connector 20.

The two-side flange portions of the male connector 20 and the female connector 30 divided into two sides by the block have a width W of 5 mm to 10 mm and a thickness of 0.3 mm to 0.4 mm.

This flange portion is bonded to either side of both ends of the carcass 10 or the innerliner using a tire bonding agent.

The thickness varies depending on the type of tire, but on average, the inner liner is about 1.6 mm thick and the carcass 10 is about 1.2 mm thick.

Therefore, when the present invention is applied to the carcass 10, the engagement height (H) of the male connector 20 and the female connector 30 is 1.8mm to 2.0mm, the coupling height (H) when applied to the inner liner Is 2.2 mm to 2.4 mm.

1 is an exemplary view showing a joining structure of both ends of the carcass used in the pneumatic tire of the present invention.

Fig. 2 is a sectional view taken along the longitudinal direction of these connectors in a state in which a pair of male and female connectors used in the pneumatic tire of the present invention are engaged.

Figure 3 is an exemplary view showing the principle that the dent occurs in the junction structure of both ends of the carcass.

Figure 4 is an exemplary view showing the principle that bulge occurs in the junction structure of both ends of the carcass.

[Description of Drawing Reference]

10: carcass

20: male connector

21: stud

22: laminate

30: female connector

31: recess

32: laminate

40: dent

50: bulge

60: side wall

H: mating height of male and female connectors

W: Width of the flange portion of the male connector (or female connector)

Claims (3)

A pneumatic tire in which a joining structure having a predetermined width is formed at both ends of an inner liner or both ends of a carcass, A male connector 20 disposed at one side of the inner liner or carcass 10 such that the studs 21 are positioned between both ends of the inner liner or both ends of the carcass 10; On the other side of the inner liner or carcass 10 such that the groove 31 corresponding to the stud 21 is located between both ends of the inner liner or both ends of the carcass 10. A female connector 30 disposed; It is configured to include, When forming tires on the surfaces of the male connector 20 and the female connector 30 in contact with both ends of the inner liner or both ends of the carcass 10 and the contact surfaces of the stud 21 and the groove 31. And pneumatic tires with reduced occurrence of dents or bulges, each of which is coated with a tire cement. The method of claim 1, When the male connector 20 and the female connector 30 are used for the carcass 10, the engagement height H of the male connector 20 and the female connector 30 is from 1.8 mm to 2.0 mm; When the male connector 20 and the female connector 30 are used for the innerliner, the engagement height H of the male connector 20 and the female connector 30 is 2.2 mm to 2.4 mm; Dent or bulge, characterized in that the width (W) of the flange portion of the male connector 20 and the female connector 30 overlapping both ends of the inner liner or both ends of the carcass 10 is 5mm to 10mm The occurrence of pneumatic tires is reduced. The method according to claim 1 or 2, The male connector (20) and the female connector (30) is a pneumatic tire with reduced occurrence of dents or bulge, characterized in that made of a rubber more flexible than the innerliner or carcass (10).

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