JP2001212889A - Tire forming drum, method of manufacturing tire, and paired guides for fixing tire reinforcing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tire forming drum enabling improvement of the durability of a tire by reducing a positional slippage in the direction of the width of a belt member and by improving thereby the forming accuracy of a belt layer. SOLUTION: On the outer peripheral surface 10A of each segment 11 constituting the tire forming drum 10, a pair of fixing guides 16 are provided, being spaced by the width of the belt member 18. Besides, the segment 11 is provided with a magnet attracting the belt member 18. Combination of the magnet with the fixing guides 16 prevents the belt member 18 from slipping in the direction of the width thereof (direction of an arrow A), even when the member is stitched. As the result, the forming accuracy of the belt layer can be enhanced and thus durability of the tire can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire building drum for forming a tire reinforcing layer by winding a tire reinforcing member around an outer peripheral surface, a method of manufacturing a tire, and a pair of tire reinforcing members provided on the outer peripheral surface of the tire building drum. For fixed guide.

[0002]

2. Description of the Related Art Generally, when a belt member is wound around an outer peripheral surface of a forming drum to form a belt layer, stitching is performed by a stitcher roll to press each belt member.

In such stitching, since the stitcher roll presses the belt member, the belt member is largely displaced in the width direction of the forming drum. Therefore,
Conventionally, in order to reduce the displacement of the belt member, magnets are embedded at several places on the outer peripheral surface of the molding drum, and the belt member is fixed by suction.

[0004]

However, when the weight of the belt member is large in a large-sized tire, especially in a radial tire for a construction vehicle, the belt member cannot be sufficiently fixed by the magnet alone. Was. The displacement of the belt member at the time of molding significantly impairs the durability of the tire. Therefore, it has been necessary to improve the molding accuracy of the belt layer in order to ensure the product performance of the tire.

In view of the above, the present invention has been made in consideration of the above-described circumstances, and has been made in consideration of the above-described problem. It is an object to provide a tire manufacturing method and a pair of tire reinforcing member fixing guides.

[0006]

According to a first aspect of the present invention, there is provided a tire building drum for forming a tire reinforcing layer by winding a sheet-like tire reinforcing member around an outer peripheral surface. A positioning member for positioning the tire reinforcing member is provided.

According to this structure, for example, in a radial tire forming step, a tire reinforcing layer (belt layer) is formed by winding a tire reinforcing member (belt member) around an outer peripheral surface of a tire building drum. Since the positioning member is provided on the outer peripheral surface of the molding drum, the belt member is positioned at a regular position. For this reason, the molding accuracy of the belt layer can be increased, and the durability of the tire can be improved.

In the tire building drum according to the present invention, the positioning member is a pair of tire reinforcing member fixing guides provided on both sides in the width direction of the tire reinforcing member to prevent the tire reinforcing member from moving in the width direction. It is characterized by.

According to this structure, the positioning members are a pair of tire reinforcing member fixing guides provided on both sides in the width direction of the tire reinforcing member to prevent the tire reinforcing member from moving in the width direction. Since both end portions in the direction abut against and are guided by the tire reinforcing member fixing guide, the displacement of the tire reinforcing member in the width direction can be reduced. As a result, the molding accuracy of the tire reinforcing layer can be improved, and the durability of the tire can be improved.

According to a third aspect of the present invention, in the tire building drum, the tire reinforcing member fixing guide is movable in a width direction of an outer peripheral surface of the tire building drum.

According to this structure, the tire reinforcing member fixing guide can be moved in the width direction of the outer peripheral surface of the tire building drum, so that the tire reinforcing member fixing guide is fixed in accordance with the width of the tire reinforcing member wound around the tire building drum. Guide spacing can be adjusted. For this reason, it can respond to each of the tire reinforcing members having different widths, and the practicability can be improved.

According to a fourth aspect of the present invention, the thickness of the tire reinforcing member fixing guide is 50 to 100% of the thickness of the tire reinforcing member.

According to this structure, the thickness of the tire reinforcing member fixing guide is 50 to 100% of the thickness of the tire reinforcing member. The displacement in the width direction can be effectively reduced.

Conversely, if the thickness of the tire reinforcing member fixing guide is less than 50% of the thickness of the tire reinforcing member, the positional displacement in the width direction cannot be sufficiently suppressed. On the other hand, if it exceeds 100%, for example, a gap is formed between the end portion of the tire reinforcing member and the cushion rubber, and the adhesion between the two becomes insufficient.

According to a fifth aspect of the present invention, there is provided a tire building drum, wherein a magnet is provided on an outer peripheral surface of the tire building drum.

According to this configuration, since the magnet is provided on the outer peripheral surface of the tire building drum, when the tire reinforcing member includes a steel cord, the tire reinforcing member can be attracted. For this reason, the positional displacement of the tire reinforcing member can be more effectively reduced by combination with the tire reinforcing member fixing guide.

A pair of tire reinforcing member fixing guides according to a sixth aspect of the present invention are provided on the outer peripheral surface of a tire building drum for forming a tire reinforcing layer by winding the tire reinforcing member around the outer peripheral surface and on both sides in the width direction of the tire reinforcing member. It is provided to prevent the tire reinforcing member from moving in the width direction.

According to this configuration, the tire reinforcing member fixing guide is provided on the outer peripheral surface of the tire building drum on both sides in the width direction of the tire reinforcing member, so that the movement of the tire reinforcing member in the width direction can be prevented. For this reason, the molding accuracy of the tire reinforcing layer can be improved, and the durability of the tire can be improved.

According to a seventh aspect of the present invention, there is provided the tire manufacturing method, wherein a tire reinforcing member fixing guide for positioning both end portions in the width direction of the tire reinforcing member is provided on an outer peripheral surface of the tire building drum.
The tire reinforcing member is guided between the tire reinforcing member fixing guides and wound to form a tire reinforcing layer.

According to this tire manufacturing method, the tire reinforcing member fixing guide is provided on the outer peripheral surface of the tire building drum, and the tire reinforcing member is guided between the tire reinforcing member fixing guides and wound around the outer peripheral surface. A tire reinforcement layer is molded. For this reason, the molding accuracy of the tire reinforcing layer can be improved, and the durability of the tire can be improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire building drum according to an embodiment of the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view of a tire building drum provided with a guide on the outer peripheral surface, FIG. 2 is a side view of the tire building drum provided with a guide on the outer peripheral surface, and FIG. 3 is a tire building drum provided with a guide on the outer peripheral surface. It is a top view of a drum.

As shown in FIGS. 1 and 5, a tire building drum 10 (hereinafter, abbreviated as "building drum 10" as appropriate).
Has eight segments 11 divided in the circumferential direction. The segment 11 is configured to be movable in the radial direction, and a magnet 12 is embedded in the outer peripheral surface 10A (drum surface).

Each segment 11 (forming drum 1
A pair of belt member fixing guides 16 (hereinafter, abbreviated as “fixing guides 16”) are provided on the outer peripheral surface 10A of (0). The fixed guide 16 is formed in an arc-shaped cross section, and has an elongated hole 13 formed substantially at the center. The fixing guide 16 is fixed on the outer peripheral surface 10A by inserting a screw 15 through the elongated hole 13 and screwing into a screw hole 17 formed in the outer peripheral surface 10A of each segment 11. By loosening the screw 15, the fixed guide 16 can slide the outer peripheral surface 10 </ b> A in the width direction (the direction of the arrow A in FIG. 1). As shown in FIGS. 3 and 4, the thickness t of the fixed guide 16 is set to 50 to 100% of the thickness of the belt member 18 described later.

A shaft 14 passes through the center of the molding drum 10. A driving device (not shown) such as a motor is connected to an end of the shaft 14.

Further, as shown in FIG.
Near the conveying roller 20 for conveying the belt member 18.
Is provided. The shaft 21 of the transport roll 20
A drive device (not shown) is also connected to the end of the drive.

At a position facing the outer peripheral surface 10A of the segment 11, a stitcher roll 22 for pressing the belt member 18 wound around the outer peripheral surface 10A of the forming drum 10 is provided. This stitcher roll 2
Reference numeral 2 indicates that the belt member 18 can be pressed by an urging mechanism (not shown).

Next, the operation and effect of the tire building drum 10 will be described.

As shown in FIG. 2, the shaft 21 is rotated by the driving device, and the transport roll 20 is rotated. By the rotation of the transport roll 20, the belt member 18A located at the innermost layer is transported in the arrow C direction. Belt member 18A
Is located near the molding drum 10, the operator positions the tip of the belt member 18 </ b> A between the fixed guides 16 of the molding drum 10. At this time, the belt member 18A including the steel cord is attracted and fixed to the magnet 12 positioned on the outer peripheral surface 10A. The fixed guide 1
Numeral 6 is slid in the width direction (the direction of arrow A in FIG. 3) and is provided in advance corresponding to the width of the belt member 18A.

Next, the shaft 14 is driven by the driving device to rotate the forming drum 10 in the direction of arrow B in FIG. 2, and the belt member 18A is pressed against the outer peripheral surface 10A of the forming drum 10 while being pressed by the stitcher roll 22. It is wound around.

As described above, when the belt member 18A is wound, the magnet member 12 is adsorbed and fixed by the magnet 12 embedded in the outer peripheral surface 10A of the forming drum 10, and both ends in the width direction of the belt member 18A are fixed to the fixed guides 1A.
6, the belt member 18A is prevented from moving in the width direction (the direction of arrow A in FIG. 4).

For this reason, even if the belt member 18A is pressed by the stitcher roll 22, the belt layer 24 can be formed in a state where the displacement of the belt member 18A in the width direction is reduced.

Next, when the winding of the innermost belt member 18A is completed, as shown in FIG.
Cushion rubber 31 is provided at both ends in the tire width direction.

Next, the belt member 18B is
It is wrapped around A. And the belt member 18B
Is wound around the belt member 18A, cushion rubbers 33 are provided at both end portions in the tire width direction.

The center line extending in the longitudinal direction of the belt member 18B coincides with the center line extending in the longitudinal direction of the belt member 18A, and the belt member 18B is moved to the belt member 18A.
By winding up, the belt member 18B does not shift in the width direction of the belt member 18B (the direction of arrow A in FIG. 4) due to tackiness.

Next, the belt member 18C is
It is wound on B. This belt member 18C also
Similarly, by being wound around the belt member 18B, the belt member 18C does not shift in the width direction.

As described above, the belt members 18A, 18A
B and 18C are sequentially wound around the outer peripheral surface 10A, and the belt layer 24 is formed.

By forming the belt layer 24 in the above manufacturing process, it is possible to suppress variations in the width of the belt layer 24 between tires.

In particular, when the weight of the belt member 18 is large, such as a radial tire for a construction vehicle, the magnet 12
By the synergistic effect of the suction by the fixing and the positioning by the fixed guide 16, the displacement of the belt layer 24 in the width direction can be effectively reduced.

The belt layer 24 on the outer periphery of the tire
Can be reduced in the width direction.

Specifically, the fixed guide 1 is attached to the outer peripheral surface 10A.
In the case where the belt layer 24 was molded using the conventional molding drum not provided with the belt 6, the average value of the deviation in the width direction of the belt layer 24 between the tires was ± 10 mm, whereas the molding drum of the present invention was The average value of the deviation in the width direction of the belt layer 24 between the respective tires when molded at 10 was ± 2 mm. That is, the average value of the difference in the widthwise movement of the belt layer 24 was 20 mm in the related art, but 4 mm in the present invention.
Met.

The belt layer 24 on the outer periphery of the tire
In the width direction was ± 5 mm in the prior art, but ± 1 mm in the present invention.

Further, in the present invention, as shown in FIG. 4, the thickness t of the fixed guide 16 is 50 times the thickness of the belt member 18A.
Since it is set to １００100%, the displacement of the belt layer 24 in the width direction can be reduced more effectively. That is, if the thickness t of the fixed guide 16 is less than 50% of the thickness of the belt member 18A, the belt member 18A cannot be positioned sufficiently.
Since a gap is formed between the end of A and the cushion rubber and the bonding becomes insufficient, it is effective within the above set range.

Further, by sliding the fixed guide 16 in the width direction of the forming drum 10, the belt member 18A
And can be made practical.

As described above, by reducing the displacement of the belt layer 24 in the width direction, the molding accuracy of the belt layer 24 can be improved, and the durability of the tire can be improved.

[0045]

According to the present invention, the durability of the tire can be improved by reducing the displacement of the belt member in the width direction and improving the molding accuracy of the belt layer.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tire building drum according to an embodiment of the present invention.

FIG. 2 is a side view of the tire building drum according to the embodiment of the present invention.

FIG. 3 is a plan view of a tire building drum according to one embodiment of the present invention.

FIG. 4 is a partial sectional view of a tire building drum around which the tire reinforcing member of the present invention is wound.

FIG. 5 is a partial perspective view of each segment constituting the tire building drum of the present invention.

[Explanation of symbols]

Reference Signs List 10 tire building drum 10A outer peripheral surface 12 magnet 16 tire reinforcing member fixing guide (positioning member) 18A belt member (tire reinforcing member) 24 belt layer (tire reinforcing layer)

Claims (7)

[Claims] 1. A tire building drum for forming a tire reinforcing layer by winding a sheet-shaped tire reinforcing member around an outer peripheral surface, wherein a positioning member for positioning the tire reinforcing member is provided on the outer peripheral surface of the forming drum. Characteristic tire building drum. 2. The tire positioning member according to claim 1, wherein the positioning member is a pair of tire reinforcing member fixing guides provided on both sides in the width direction of the tire reinforcing member to prevent the tire reinforcing member from moving in the width direction. 2. The tire building drum according to 1. 3. The tire building drum according to claim 2, wherein the tire reinforcing member fixing guide is movable in a width direction of an outer peripheral surface of the tire building drum. 4. The thickness of the tire reinforcing member fixing guide is:
The tire building drum according to claim 2 or 3, wherein the thickness is 50 to 100% of the thickness of the tire reinforcing member. 5. The tire building drum according to claim 2, wherein a magnet is provided on an outer peripheral surface of the tire building drum. 6. A tire forming drum which is formed on the outer peripheral surface by winding a tire reinforcing member around the outer peripheral surface to form a tire reinforcing layer, is provided on both sides in the width direction of the tire reinforcing member, and moves in the width direction of the tire reinforcing member. A pair of tire reinforcing member fixing guides, wherein the guides prevent the occurrence of the tire reinforcing member. 7. The tire reinforcing member is guided between the tire reinforcing member fixing guides and wound around the outer peripheral surface of a tire building drum provided with a tire reinforcing member fixing guide for positioning both widthwise ends of the tire reinforcing member. A method for producing a tire, wherein a tire reinforcing layer is molded.