JP2002028989A - Method for molding tire component member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for molding a tire component member by laminating ribbon-shaped rubber sheets which prevent the peeling of the rubber layer of the highly bent part of a tire. SOLUTION: In the molding method in which the ribbon-shaped rubber sheets 7 are dislocated in turn and laminated on a support 2 to form the tire component member 6, the rubber sheets 7 are laminated so that the width direction of the rubber sheets 7 is arranged approximately in the extension/contraction direction of the tire during being loaded at least in the highly bent part of the tire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a tire component by laminating ribbon-like rubber.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No.
There is an example described in JP-A-251466.

[0003]

However, in this example, a tread rubber layer is formed, and therefore, there is no portion that bends greatly when the tire is loaded. Therefore, the rubber layer of the ribbon-like rubber laminated for bending is used. No delamination occurs. Therefore, there is no disclosure of a method of laminating a ribbon-like rubber that prevents peeling of the rubber layer.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of molding a tire component by laminating a ribbon-like rubber for preventing a rubber layer at a highly bent portion of a tire from peeling. The point is to provide.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a tire constituting member is formed by laminating ribbon-like rubbers sequentially on a support and laminating them on a support. A method of molding a tire component in which a ribbon-like rubber is laminated so that the width direction of the ribbon-like rubber is substantially made to extend along the width direction of the ribbon-like rubber at least in a highly bent portion of the tire when the tire is loaded.

[0006] In a high bending portion which bends particularly greatly when the tire is loaded, an extension force acts on the outside of the high bending portion and a compressive force acts on the inside, so that the width direction of the ribbon-like rubber is substantially along the stretching direction. By doing so, the stretching force can generally act in the width direction of each ribbon-shaped rubber layer, does not act much in the direction in which the laminated rubber layer is peeled off, and can prevent peeling of the rubber layer due to bending of the high bending portion. .

According to a second aspect of the present invention, in the method of forming a tire component according to the first aspect, the highly bent portion of the tire is located at a sidewall portion of the tire.

[0008] Since the sidewall portion of the tire is particularly greatly bent when the tire is loaded, peeling of the rubber layer at the highly bent portion of the sidewall portion can be prevented.

A third aspect of the present invention is a molding method for forming a sidewall by sequentially shifting a ribbon-like rubber on a support to form a sidewall, wherein the ribbon-like rubber is sequentially laminated from a top tread side to a bead side. This is a method for molding a tire component in which the sidewall is formed so that the width direction of the ribbon-like rubber is substantially aligned at least with the shoulder portion of the sidewall in the direction of expansion and contraction when the tire is loaded.

The sidewall has a high bending portion which bends when the tire is loaded. The sidewall is formed by sequentially laminating a ribbon-like rubber from the top tread side to the bead side. By making the width direction of the ribbon-like rubber substantially along the direction of expansion and contraction of the ribbon-like rubber, the expansion and contraction force can work almost in the width direction of each layer of the ribbon-like rubber,
It does not act so much in the direction in which the laminated rubber layer is peeled off, and can prevent peeling of the rubber layer due to bending of the high bending portion.

According to a fourth aspect of the present invention, there is provided a molding method for forming a sidewall by sequentially laminating and laminating ribbon-like rubber, wherein the ribbon-like rubber is successively arranged at least in the outer layer of the sidewall from the top tread side to the bead side. This is a method for molding a tire component, which is laminated, so that the width direction of the ribbon-like rubber is made to substantially follow the direction of expansion and contraction under a tire load at the highly bent portion of the outer layer of the sidewall.

[0012] Since the rubber layer is easily peeled off on the outer surface of the highly bent portion of the sidewall which bends when the tire is loaded, the lamination of the ribbon-like rubber forming at least the outer layer of the sidewall is shifted from the top tread side to the bead side. By laminating the rubber layers sequentially and making the width direction of the ribbon-like rubber substantially along the expansion and contraction direction when the tire is loaded, peeling of the rubber layer can be prevented.

According to a fifth aspect of the present invention, in the method of forming a tire component according to the first or fourth aspect, the support is a case supported on a core.

The ribbon-like rubbers which are sequentially shifted and stacked are supported by a core via a case, so that they can be directly carried to a vulcanization step and vulcanized and molded. Therefore, after laminating the ribbon-shaped rubber, the ribbon-shaped rubber is not deformed until the vulcanization step is performed and the ribbon-shaped rubber does not fall off.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing an embodiment of the present invention, an example different from the present invention shown in FIGS. 4 and 5 will be described. This example relates to a pneumatic tire 01, and attaches a sidewall 06 constituting a side portion of the tire to a toroidal core.
08, and is formed by laminating a ribbon-like rubber using the carcass ply 02 as a support.

In the pneumatic tire 01, the carcass ply 02 as the inner layer bulges outward at the center and the right and left ends are wrapped around the beads 03 and 03, respectively, and are folded outward. A plurality of belt layers 04 are stacked on the outer periphery of the exposed central portion. A top tread 05 is overlaid on the belt layer 04. Regardless of the bead structure, a sandwich structure may be used.

A bead 03, 03 is formed from the belt layer 04 at the central portion of the carcass ply 02 supported by the toroidal core 08.
Side walls 06, 06 are superimposed on the outer surface of the side portion to. The side wall 06 is formed by winding a ribbon-shaped rubber and sequentially shifting and laminating the same.

Here, as shown in FIGS. 4 and 5, a ribbon-shaped rubber is sequentially shifted from the bead 03 side to the top tread 05 side and laminated to form a side wall 06, and the side wall 06 is formed at a high bending portion of the tire. , Generally a side wall
In the vicinity of the maximum width of the tire from the top tread 05 of the tire 06, the ribbon-shaped rubber layer is laminated with its width direction at an angle almost perpendicular to the load input direction which is the direction of expansion and contraction when the tire is loaded.

As described above, the respective tire components are supported on the toroidal core 08 and are conveyed to a vulcanization step to be vulcanized and molded. When a load is applied to the top tread 05 of the pneumatic tire 01 thus manufactured toward the center of rotation and the pneumatic tire 01 is deformed, the outer surface layer of the sidewall 06 expands and the inner surface layer is compressed, and the pneumatic tire 01 is compressed. Is greatly bent outward (see FIG. 5).

When a load is applied to the top tread 05 of the pneumatic tire 01, a force that deforms into a fan shape is applied to the highly bent portion 09 of the sidewall 06 as shown in FIG.

This may cause peeling between the ribbon layers on the tire surface.

When the side wall 06 is formed by laminating the ribbon-like rubber sequentially from the bead 03 side to the top tread 05 side to form the side wall 06, the width direction of the laminated rubber layer becomes an angle almost perpendicular to the direction of expansion and contraction under load. Holding, so that peeling may occur between the outer rubber layers.

On the other hand, in the pneumatic tire 1 according to the embodiment of the present invention shown in FIG. 1, the members other than the sidewalls 6, that is, the carcass ply 2, the bead 3, the belt layer 4, the top tread 5 and the like This is the same as the example shown in FIGS.

The sidewall 6 of the pneumatic tire 1
Is a carcass ply 2 on a toroidal core 8 and a ribbon-like rubber on the top tread 5,
The side walls 6 are formed by being sequentially shifted from the side to the bead 3 side. In FIG. 1, the top tread 5 is stacked on the end of the sidewall 6,
Conversely, a structure in which the end of the sidewall 6 is overlapped on the side of the top tread 5 may be employed.

Then, in the sidewall 6, the rubber layers formed by the ribbon-like rubber at the high bending portion 9 of the tire are laminated with an inclination nearly parallel to the load input direction when the tire is loaded. The pneumatic tire 1 is manufactured by being transported to a vulcanization step and vulcanized and molded while each tire component is supported on the toroidal core 08 in this manner.

When the pneumatic tire 1 is attached to a rim of a vehicle and a load is applied to the top tread 5 toward the center of rotation and the pneumatic tire 1 is deformed, the outer surface layer of the sidewall 6 is extended and the inner surface layer is expanded. Is compressed (see FIG. 2), and the sidewall portion of the pneumatic tire 01 is largely bent outward.

The direction of expansion and contraction acting on the outer surface layer and the inner surface layer of the sidewall 6 is almost parallel to the tire load input direction, so that the rubber layer 7 of the highly bent portion 9 is along the direction of expansion and contraction when the tire is loaded.

Therefore, the stretching force acts in the width direction of the rubber layer. When the sidewall 6 of the pneumatic tire 1 is largely bent outward, the compression / extension force acts as a force in the direction of peeling the ribbon layer from the rubber layer of the highly bent portion 9 of the sidewall 6 shown in FIG. No (see FIG. 2).

Next, another embodiment will be described with reference to FIG. The pneumatic tire 11 according to the present embodiment is made of the same members as the pneumatic tire 1 of the above embodiment except for the sidewalls 16, and has a carcass ply 12, a bead 13, a belt layer 14, a top tread on a toroidal core, respectively. 15 are stacked.

Then, the sidewall 16 is formed by laminating the ribbon-like rubber while shifting it sequentially from the bead 13 side to the top tread 15 side to form each inner rubber layer 17, which is folded back on the top tread 15 side. Are laminated on the formed inner rubber layers 17 sequentially from the top tread 15 side to the bead 13 side to form outer rubber layers 18.

Since the outer rubber layer 18 of the side wall 16 is laminated while being sequentially shifted from the top tread 15 side to the bead 13 side, the width direction of each rubber layer 18 in the shoulder portion corresponds to the expansion and contraction direction when the tire is loaded. Because it will be along
The stretching force acts in the width direction of each rubber layer 18 made of ribbon-shaped rubber.

In the side wall 16 shown in FIG.
When a load is applied to the top tread 15, the lamination of the surface layer is distorted in the width direction of the ribbon.

Therefore, no force is applied in the direction in which the laminate is peeled, and peeling between the rubber layers is prevented.

Next, an example of forming a sidewall by laminating a ribbon-like rubber on a bladder of a molding machine using a carcass ply as a support will be described. Figure 6 shows an expanded bladder of a molding machine
The raw case 21 formed on 28 is shown. With the carcass ply 22 as a support on the bladder 28, the carcass ply 22 bulges outward at the center, the left and right sides are inclined, and the left and right ends are wrapped around the beads 23, 23 and folded outward,
A plurality of belt layers 24 are stacked on the outer periphery of a central portion that protrudes outside the carcass ply 22.

Then, as shown in FIG. 6, the raw rubber 21 is manufactured by laminating the ribbon-shaped rubbers on the inclined left and right sides sequentially from the bead 23 side to the belt layer 24 side to form side walls 26.

The raw case 21 is a bladder that has been expanded.
When the bladder 28 is reduced at this time, each tire component such as the carcass ply 22 supported by the expanded bladder 28 is bladder. The internal pressure support by 28 is removed and deformed as shown in FIG.

That is, the inclination of the inclined sidewall 26 is further increased. But the ribbon rubber beads 23
Since the rubber layers are sequentially laminated from the side to the belt layer 24 side, the ribbon-shaped rubber on the outer peripheral side is supported by the rubber-shaped rubber on the inner peripheral side, and the ribbon-shaped rubber does not shift and fall off.

Here, as shown in FIG. 8, the ribbon-like rubber is turned in the reverse order from the belt layer 024 side to the bead 023 side.
When the bladder 028 is reduced when it is stacked on the 022, the inclination of the sidewall 026 becomes steeper, and FIG.
As shown in (1), there is a case where the respective ribbon-shaped rubbers are displaced and fall off because the support of the ribbon-shaped rubber on the inner peripheral side is not obtained.

Therefore, when a raw case is formed on a bladder of a molding machine, it is necessary to form a sidewall by laminating ribbon-like rubbers sequentially from the bead side to the belt layer side.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a pneumatic tire according to an embodiment of the present invention in a state where a load is not applied.

FIG. 2 is a sectional view showing a change of a main part of the sidewall in FIG. 1;

FIG. 3 is a cross-sectional view of a main part when a pneumatic tire according to another embodiment is loaded.

FIG. 4 is a cross-sectional view of a principal part in a state where a load is not applied to an example of a pneumatic tire different from the present invention.

FIG. 5 is a sectional view showing a change of a main part of the sidewall in FIG. 4;

FIG. 6 is a cross-sectional view of an example of a raw case in a state where it is molded by expansion of a bladder.

FIG. 7 is a sectional view showing the shape of the raw case when the bladder is reduced.

FIG. 8 is a cross-sectional view of another example of a raw case in a state of being molded by expansion of a bladder.

FIG. 9 is a sectional view showing the state of the raw case when the bladder is reduced.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pneumatic tire, 2 ... Carcass ply, 3 ... Bead, 4 ... Belt layer, 5 ... Top tread, 6 ... Side wall, 7 ... Rubber layer, 9 ... High bending part, 11 ... Pneumatic tire, 12 ... Carcass Ply, 13… bead, 14… belt layer,
15 ... Top tread, 16 ... Side wall, 17 ... Rubber layer, 18 ... Rubber layer, 19 ... High bending part, 21 ... Raw case, 22 ... Carcass ply, 23 ... Bead, 24 ... Belt layer, 26 ... Side wall, 28 ... bladder.

Claims (5)

[Claims] 1. A method for forming a tire constituent member by laminating a ribbon-like rubber on a support while sequentially shifting the ribbon-like rubber, wherein the ribbon-like rubber is stretched at least in a highly bent portion of the tire in the direction of expansion and contraction when the tire is loaded. 3. A method for molding a tire component, comprising laminating a ribbon-like rubber so as to substantially follow the width direction of the tire. 2. The method according to claim 1, wherein the highly bent portion of the tire is located at a sidewall portion of the tire. 3. A molding method for forming a sidewall by sequentially shifting a ribbon-shaped rubber on a support, wherein the sidewall is formed by sequentially laminating the ribbon-shaped rubber from a top tread side to a bead side. A method for molding a tire component, wherein the width direction of the ribbon-shaped rubber is made to substantially follow the direction of expansion and contraction when a tire is loaded at least at a highly bent portion of the sidewall by forming the tire. 4. A molding method for forming sidewalls by sequentially shifting and laminating ribbon-like rubbers, wherein the ribbon-like rubbers are laminated sequentially from a top tread side to a bead side at least in an outer layer of the sidewall, and a side wall is formed. A method for molding a tire component, wherein a width direction of a ribbon-like rubber is made to substantially follow a direction of expansion and contraction under a tire load at a high bending portion of an outer layer. 5. The method according to claim 1, wherein the support is a case supported on a core.