JPH0632110A - Belt reinforcing member winding structure in tire - Google Patents

Abstract

PURPOSE:To provide a belt reinforcing member winding structure in a tire by which RRO can be improved and uniformity of the tire can be improved. CONSTITUTION:Respective reinforcing materials 4 are wound symmetrically in an annular shape at least in one end part in a winding width direction of the reinforcing materials 4 wound symmetrically in an annular shape to each other round both end parts on belts 3 arranged between a carcass 1 and a tread 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for winding a belt reinforcing material in a tire. More specifically, it is possible to improve longitudinal runout (Radial Run Out: RRO) of the tire, thereby improving uniformity. The present invention relates to a structure for winding a belt reinforcing material in a tire.

[0002]

2. Description of the Related Art Conventionally, in order to enhance high speed performance of tires,
Jointless strip members are provided as belt reinforcing members at both left and right ends of the belt arranged between the carcass and the tread. This jointless strip material is configured by embedding a reinforcing fiber cord along the longitudinal direction in a strip-shaped rubber sheet having a width of 10 mm, for example.

The structure in which the belt reinforcing material is wound around the right and left ends of the belt is a single winding or a double winding, respectively, and the jointless strip materials are spirally wound in a state where they are abutted with each other without wrapping. It is wrapped around. The left and right jointless strip materials are wound from the left and right symmetrical positions on the belt 3 so that the left end and the right end on the belt are left and right symmetrical.

In the case of a single winding, the left and right jointless strip materials are spirally wound from the inside to the outside of the tire or from the outside to the inside. In the case of double winding, it is spirally wound from the inside to the outside of the tire and then folded back to be further spirally wound toward the inside, or vice versa. It is wound, folded back, and further spirally wound outward.

[0005]

However, in the above-mentioned structure for winding the belt reinforcing material, since the jointless strip material is spirally wound without being wrapped on the belt, the belt reinforcing material is wound in the circumferential direction of the belt. On the other hand, the jointless strip material is wound in an inclined state and has different winding widths. In the case of double winding, a single winding portion and a double winding portion are generated, and a lift is applied during the vulcanization process. In that case, there is a problem in that the change in belt width becomes non-uniform on the tire circumference, RRO deteriorates, and tire uniformity is greatly affected.

The present invention has been devised in view of such conventional problems, and provides a structure for winding a belt reinforcing material in a tire, which is capable of improving RRO and thus improving the uniformity of the tire. The purpose is.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a reinforcing member which is symmetrically and spirally wound around both ends of a belt arranged between a carcass and a tread. The gist is that the reinforcing material is wound symmetrically and annularly on at least one end of the winding width direction.

[0008]

The present invention is constructed as described above, and the reinforcing material is symmetrically wound on both ends of the belt at least at one end in the winding width direction of the reinforcing material which is spirally wound. Since it is wound in an annular shape, when a lift is applied during the vulcanization process, the annular reinforcing material uniformly restrains the change in the belt width direction, making the belt width change uniform on the tire circumference and improving RRO. You can do it.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cross-sectional view of a tire, 1
Is a carcass for lining the reinforcing cords in a comb shape and attaching rubber to hold the internal pressure of the tire and to support the load.
Is a tread that directly contacts the road surface when the tire rolls and transfers the force, and 3 is a belt having a width close to the width of the tread 2 and serving as a reinforcing band provided between the carcass 1 and the tread 2. Is.

The belt 3 comprises a first belt 3a on the carcass 1 side and a second belt 3b having a width narrower than that of the first belt 3a on the tread 2 side. A belt reinforcing member 4 (jointless strip member) in which reinforcing fiber cords are embedded is wound along the longitudinal direction of the strip-shaped rubber sheet. As shown in FIGS. 2 and 3, the reinforcing member 4 has the winding start end 4a of the reinforcing member 4 arranged on the second belt 3b, and has an annular shape (with respect to the width direction of the belt 3) on the circumference of the belt 3. After the reinforcing material 4A is wound around the tire in a direction (perpendicular to the right angle) once, the reinforcing material 4B of the first winding does not wrap toward the shoulder side of the tire and the sides of the reinforcing material 4 are in contact with each other. One belt 3a is spirally wound around the circumference of the belt 3 to the end portion.

Then, the reinforcing material 4C of the double winding folded back from the end portion of the first belt 3a is wound toward the center side of the tire in the same manner as the first winding, and the reinforcing material 4
The winding terminating portion 4b is configured to wrap with the winding starting end portion 4a. The winding start ends 4a of the reinforcing members 4 on both sides of the belt 3 are arranged at positions symmetrical with respect to the line of symmetry MM on the circumference of the belt 3. Therefore, the left and right belt reinforcing members 4 on the circumference of the belt 3 have a bilaterally symmetrical structure.

As described above, the reinforcing member 4A is symmetrically and annularly wound around the inner end in the winding width direction of the reinforcing member 4 which is symmetrically wound around both ends of the belt 3 in this manner. When a lift is applied during the vulcanization process, the annular reinforcing member 4A uniformly restrains the change in the belt width direction, and the belt width change can be made uniform on the tire circumference to improve RRO.

4 and 5 show an example in which an annular reinforcing member 4A is wound around the outer end of the reinforcing member 4 in the winding width direction. In this case, the reinforcing material 4 has the winding start end portion 4a of the reinforcing material 4 arranged on the second belt 3b, the reinforcing material 4B of the first winding does not wrap toward the shoulder side of the tire, and In a state where the four sides are in contact with each other, the first belt 3a is spirally wound around the circumference of the belt 3 to the end portion.

When the first belt 3a is folded back at its end portion, after the annular reinforcing member 4A is wound around the reinforcing member 4A (the outer end of the reinforcing member 4 in the winding width direction) once. ,
The reinforcing material 4C for the second winding is wound toward the center side of the tire in the same manner as the first winding. The winding end portion 4b of the reinforcing member 4 is configured to wrap with the winding start end portion 4a. The winding start end portions 4a of the reinforcing members 4 on both sides of the circumference of the belt 3 are arranged at positions symmetrical with respect to the symmetry line MM on the circumference of the belt 3 as described above.
Therefore, the left and right belt reinforcing members 4 on the circumference of the belt 3 have a bilaterally symmetrical structure.

By wrapping the reinforcing material 4A symmetrically and annularly on the outer end in the winding width direction of the reinforcing material 4 spirally wound symmetrically around both ends of the belt 3 as described above. When a lift is applied during the vulcanization step, the annular reinforcing member 4A uniformly restrains the change in the belt width direction, and the belt width change can be made uniform on the tire circumference to improve the RRO.

FIG. 6 shows an example in which the annular reinforcing member 4A is wound around the outer end portion of the reinforcing member 4 in the winding width direction by another winding method. In this case, the reinforcing material 4 has the winding start end portion 4a of the reinforcing material 4 arranged on the end portion of the first belt 3a, and the reinforcing material 4A is wound around the circumference of the belt 3 once around the circumference. The reinforcing material 4B of the first winding does not wrap toward the center side of the tire and the sides of the reinforcing material 4 are in contact with each other. The reinforcing material 4B is spirally wound around the belt 3 (second belt 3b) having a predetermined width. It is attached.

Then, it is folded back on the second belt 3b to be 2
The reinforcing material 4C of the heavy winding is wound toward the shoulder side of the tire in the same manner as the first winding, and the winding end portion 4b of the reinforcing material 4 is configured to wrap with the winding start end 4a. ing. In the same manner as described above, the winding start ends 4a of the reinforcing members 4 on both sides of the belt 3 are aligned with the symmetry line M of the belt 3 on the circumference.
The belt reinforcements 4 on the left and right sides of the circumference of the belt 3 are symmetrically arranged with respect to the belt M.

Even when the reinforcing member 4 is wound around the outer end portion in the winding width direction as described above, the belt width change can be made uniform on the tire circumference in the same manner to improve the RRO. Figure 7
An example in which annular reinforcing members 4A are wound around both end portions of the reinforcing member 4 in the winding width direction is shown. When the first winding of the reinforcing member 4 is wound toward the shoulder side of the tire, the second belt 3b
The winding start end portion 4a of the reinforcing material 4 is arranged on the upper side, and the reinforcing material 4A is wound around the circumference of the belt 3 for one round, and then the reinforcing material 4B for the first winding toward the shoulder side of the tire. Is spirally wound in the same manner as described above.

When it is folded back at the end of the first belt 3a, the annular reinforcing member 4A is further folded at the folded back portion.
After being wound around, the reinforcing material 4C of the double winding is wound toward the center side of the tire in the same manner as the first winding. The rest is the same as above. When the first winding of the reinforcing material 4 is wound toward the center of the tire, the winding start end portion 4a of the reinforcing material 4 is arranged on the end portion of the first belt 3a, and the same method as described above is used. The first winding may be performed on the center side of the tire, and the second winding may be performed on the shoulder side of the tire.

As described above, the reinforcing material 4A is symmetrically and annularly wound around both end portions in the winding width direction of the reinforcing material 4 spirally wound symmetrically around both ends of the belt 3 as described above. When a lift is applied during the vulcanization process, the annular reinforcing member 4A prevents unevenness in the change in the belt width direction from occurring on both sides.
Since the belt width is restrained at the points, the change in the belt width can be made more uniform on the tire circumference to further improve the RRO.

FIG. 8 shows the RRO of a tire (embodiment) manufactured by implementing the structure for winding the belt reinforcing material according to the present invention.
The measurement results of are shown together with the tire having the structure of the conventional example (conventional example). The RRO was measured by applying an internal pressure suitable for the usage conditions to a uniformity machine, rotating the tire at a speed of 60 rpm, and measuring the longitudinal fluctuation (RRO) at the tire center at that time. The tire size of each of the tires of the example and the conventional example used for the measurement was 215 / 65R.
15 (width 215 mm / oblateness 65%, rim size 15 inches), and a reinforcing material having a width of 10 mm was used. The tire constituent materials are the same.

The belt-reinforcing member winding structure of the embodiment is the same as that described with reference to FIGS. 2 and 3, and the annular reinforcing member 4A is symmetrically and spirally wound around both ends of the belt 3. It is provided at each of the inner end portions in the winding width direction of the attached reinforcing material 4. The conventional example has a structure in which the annular reinforcing member 4A arranged in the example is not provided. As is clear from FIG. 8, it was found that the variation of the vertical shake was significantly smaller in the example than in the conventional example, and about 30% in RRO.
Has been improved. In addition, an improvement effect of about 40% was obtained for the first-order component of vertical shake fluctuation.

As described above, according to the present invention, the reinforcing material 4A is symmetrically provided on at least one end portion in the winding width direction of the reinforcing material 4 which is symmetrically wound around both ends of the belt 3. In addition, since it is wound in an annular shape, when a lift is applied during the vulcanization process, the annular reinforcing member 4A keeps the change in the belt width direction uniform and makes the belt width change uniform on the tire circumference. Can be improved. In addition, in the above-described embodiment, the case where the reinforcing member 4 has the double winding structure has been described, but the same applies to the case where the reinforcing member 4 has the single winding structure.
The present invention is not limited to the above-described embodiments, and the present invention can be implemented in modes other than the above-described embodiments.

[0024]

The present invention is constructed as described above, and the reinforcing material is symmetrically and annularly wound around at least one end in the winding width direction of the belt reinforcing material spirally arranged on both sides of the belt. As a result, the annular reinforcing material keeps the change in the belt width direction uniform during the lift in the vulcanization process, and the RRO can be improved by making the belt width change uniform on the tire circumference and improving the tire uniformity. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of a tire according to the present invention.

FIG. 2 is an explanatory view showing a winding structure of a belt reinforcing material wound around the left end portion of the belt of the present invention.

FIG. 3 is an explanatory view of a winding structure of a belt reinforcing material in FIG.

FIG. 4 is an explanatory view showing another example of the winding structure of the belt reinforcing material wound around the left end portion of the belt of the present invention.

5 is an explanatory view of a winding structure of a belt reinforcing material in FIG.

FIG. 6 is an explanatory diagram of a belt reinforcing member winding structure in which an annular reinforcing member is wound around an outer end portion in the winding width direction of the reinforcing member by another winding method.

FIG. 7 is an explanatory view showing still another example of the winding structure of the belt reinforcing material of the present invention.

FIG. 8 is a graph showing the measurement results of RRO.

[Explanation of symbols]

1 Carcass 2 Tread 3 Belt 3a 1st belt 3b 2nd belt 4 Reinforcing material 4A Annular reinforcing material 4B 1st winding reinforcing material 4C 2nd winding reinforcing material

Claims (1)

[Claims] 1. A reinforcing material, which is symmetrically and spirally wound around both ends of a belt arranged between a carcass and a tread, is reinforced at at least one end in a winding width direction. A belt reinforcing material winding structure for a tire, characterized in that the material is symmetrically and annularly wound.