JP2002361759A - Method for manufacturing tire constituent member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a tire constituent member capable of eliminating factors for the unbalance of a tire by the tire constituent member. SOLUTION: In the method for manufacturing the tire constituent member by which a strip-like member of a predetermined width is wound, in a lapping manner, around a molding drum, a double-width strip member whose width is double the predetermined width is formed and cut in the center into a pair of strip-like members 3a and 3b of a predetermined width. Then one 3a of a pair of the strip-like members 3a and 3b of a predetermined width is wound once around the molding drum and both ends of the strip-like member 3a are joined together. Further, the other strip-like member 3b of a predetermined width is lapped on the strip-like member 3a of a predetermined width already wound around the drum and wound once around the member 3a from a symmetrical position 180 deg. around from the previous joint part and both ends of the member 3b are joined together to obtain the tire constituent member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tire component which is formed by winding a plurality of layers on a forming drum.

[0002]

2. Description of the Related Art For example, in a conventional manufacturing process of a belt member as a tire constituent member, a belt material which is continuously manufactured by coating a cord with a molding machine is provided as a large roll.
The large roll is sequentially cut to a predetermined width at an oblique angle, and the cut pieces of the predetermined width are sequentially connected to form one continuous band-shaped member having a predetermined width, which is stored as a small roll.

[0003] The band-shaped member is unwound from the small roll, wrapped around the belt drum one round and joined at both ends, and then the belt-shaped members having the embedded cords whose oblique angles are opposite to each other are unwound from the small roll and stacked one round. The belt member was manufactured by winding and joining both ends.

[0004]

The continuous belt-like member is
The weight per unit area (unit mass) fluctuates from place to place in the longitudinal direction, and when the belt is wound around a belt drum and formed into an annular shape, the weight balance is lost.

[0005] Even if the belt-shaped members are stacked and wound, the inner belt-shaped member and the outer belt-shaped member have no relation with respect to the fluctuation state of the unit mass.

[0006] The unbalance of the belt member is a major factor of the unbalance of a tire manufactured by vulcanization molding.

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 manufacturing a tire component capable of eliminating a cause of tire imbalance caused by the tire component.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a belt-shaped member having a predetermined width is superimposed on a forming drum, and is manufactured by winding and forming a tire component. In the method, a double width band member having a width twice as long as the predetermined width is formed, and the double width band member is cut at the center to form a pair of predetermined width band members, and the pair of predetermined width band members are formed. One predetermined width band-shaped member of the member is wound around the forming drum one round and both ends are joined, and the other predetermined width band-shaped member of the pair of predetermined width band-shaped members is overlapped on the wound predetermined width band-shaped member. This is a method for manufacturing a tire constituent member which is manufactured by joining both ends wound one round from a symmetric position rotated by 180 degrees from a joint.

Since the pair of predetermined width band members are formed by cutting the double width band member at the center, the fluctuation states of the unit masses are similar to each other. After winding one of the predetermined width band members around the forming drum and joining both ends thereof, the other predetermined width band member having a similar unit mass variation state is overlapped on the previously wound predetermined width band member, and 18 from the joint
Since the tire constituent member is manufactured by joining the both ends wound one round from the symmetrical position rotated by 0 degrees, the variation of the unit mass of the inner predetermined width band-shaped member is similar to that of the unit mass similar to the outer predetermined width band-shaped member. Fluctuations appear 180 degrees apart from each other.

[0010] That is, the fluctuation state of the unit mass appears symmetrically with respect to the center of the annular tire constituent member, the weight balance is kept good, and the unbalance factor due to the tire constituent member of the manufactured tire. Can be removed.

According to a second aspect of the present invention, in the method of manufacturing a tire constituent member according to the first aspect, the original band-shaped member continuously manufactured by a molding machine is sequentially cut into the double width to obtain the double width. Forming a belt-shaped member

The double-width band-shaped member is formed by sequentially cutting the original band-shaped member into a double-width band, so that the pair of unit masses obtained by cutting the double-width band-shaped member at the center have predetermined widths similar to each other. It becomes easy to handle the belt-shaped member while always maintaining the correspondence.

According to a third aspect of the present invention, in the method for manufacturing a tire component according to the second aspect, the predetermined width pieces obtained by cutting the double-width band-shaped member at the center are sequentially connected to form the pair of predetermined widths. A band-shaped member is formed.

A pair of continuous belt members having a predetermined width are stored as a pair of small rolls, and the pair of small rolls are alternately supplied from the pair of small rolls to the forming drum. A well-balanced tire component can be easily manufactured using the width band-shaped member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described below with reference to FIGS. The present embodiment relates to a method for manufacturing a belt member, and the manufacturing process is shown in FIGS.

First, a cord material 10 is coated by a molding machine to continuously manufacture a belt material 1, and the belt material 1 is provided as a large roll, and the belt material 1 is supplied from the large roll.
As shown in the figure, the belt material 1 is cut diagonally at a predetermined width 2w to cut out a double-width band-shaped piece 2.

Next, the cut-out double-width band-shaped piece 2 is cut at the center to form a pair of predetermined-width pieces having a predetermined width w. A pair of continuous band members 3a and 3b having a predetermined width are formed by being connected.

A pair of band members 3a, 3b having a predetermined width are wound on winding drums 11a, 11b, respectively, and stored as a pair of small winding counters 4a, 4b.

Since the pair of predetermined width band members 3a and 3b are formed by sequentially connecting predetermined width portions formed by cutting the double width band portion 2 at the center, the fluctuation state of the unit mass in the longitudinal direction. Are similar to each other. FIG. 3 shows the fluctuation state of the unit masses in the longitudinal direction for the predetermined width band-shaped members 3a and 3b, and both unit masses fluctuate similarly.

The pair of small-width band members 3a, 3b unwound from the pair of small-winding webs 4a, 4b are wound around the belt drum 15. First, a predetermined width-band-shaped member supplied from one of the small web-winding webs 4a is used. The member 3a is wound around the belt drum 15 for one round,
The cut ends are joined (see FIG. 2).

Next, the other predetermined width band member 3b is superimposed and wound on the predetermined width band member 3a wound around the belt drum 15. At this time, the predetermined width supplied from the small winding counter 4b. The band-shaped member 3b is wound around the band member 3a with a predetermined width upside down, and the embedded cords 10 are crossed with each other in the opposite direction.

Then, as shown in FIG.
The winding is started by aligning the tip of b with the joint 3a 'of the band member 3a having a predetermined width and rotating it by 180 degrees. When the end portion of the predetermined width band-shaped member 3b is wound and cut and joined, FIG. 2 (3)
As shown in the figure, the joint 3b 'of the predetermined width band-shaped member 3b is located at the center symmetrical position with the joint 3a' of the predetermined width band-shaped member 3a.

The belt member 5 is manufactured in this manner. The fluctuation state of the unit mass of the predetermined width band member 3a and the predetermined width band member 3b for one circumference of the tire is shown by developing from the same reference angle of 0 degree. FIG.

The unit mass fluctuation state similar to each other is
Appears 180 degrees off. Therefore, in the belt member 5 having an annular shape, substantially the same unit mass exists at a position symmetrical with respect to the center of the belt member 5, and the unit masses cancel each other to maintain a good balance.

By maintaining the balance of the belt member 5 in this manner, it is possible to eliminate an unbalance factor based on the belt member of a tire manufactured using the belt member 5.

The unbalance of the tire can be defined by the unbalance direction and the amount of unbalance of the tire. Specifically, the angle θ in the rotation direction from the reference position of the light point of the balance of the tire and the unbalance amount r are unbalanced. It is measured by a balance measuring machine.

The balance light point P of the tire can be represented by polar coordinates (r, θ) with the center of the tire as the origin, and FIG. 5 shows the polar coordinates. Balance light point P (r,
In θ), the unbalance amount r indicates the distance from the origin, and the rotation direction angle θ indicates the angle from the reference direction.

FIG. 6 shows the results of measuring the unbalance of a plurality of tires manufactured by the same equipment.
As shown in the figure, the balance light point is displayed as a scattered point on the polar coordinates. The narrower the distribution range of the light balance point and the closer the distribution position of the light balance point to the origin, the better the balance.

The average r _a and the angle theta average theta _a is a point that indicates the distance r from the origin, of the balance light point distribution center C
If (r _a , θ _a ), the distribution position of the balance light point is indicated by the distribution center C (r _a , θ _a ). The distribution center C (r _a, θ _a) the mean value d _a distance from to the balance light point, indicating the distribution range of the balance light point.

[0030] Thus the distribution center C (r _a, θ _a) the mean value d _a distance from to the balance light point, narrow distribution range of small enough balance light points, distributed from the origin center C
(R _a, theta _a) the distance r _a until the close to the origin distribution position of the small enough balance light point, will exhibit a good balance state.

An unbalance measurement was performed five times for tires manufactured using the belt member formed by the conventional method and 90 tires manufactured using the belt member formed by the method of the present embodiment, and the comparison was made. The results obtained are shown in FIG.

From the table shown in FIG. 7, in the case of a tire manufactured using a belt member having a good balance formed by the method of the present embodiment, the distribution range reduction rate is 10% on average and the distribution center is lower than in the conventional method. The improvement rate is 8% on average, that is, the distribution range is reduced by 10% to reduce the variation, the distribution center is improved by 8%, and the balance is improved better near the tire center.

From this, it can be seen that if the belt member 5 can maintain a good balance, the tire manufactured using the belt member 5 can eliminate a large unbalance factor and can improve the balance.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a manufacturing process of a belt member according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a step of winding a belt member around a belt drum.

FIG. 3 is a diagram showing a variation state of a unit mass in a longitudinal direction of a band member having a predetermined width.

FIG. 4 is an expanded view showing a state in which a unit mass of a band member having a predetermined width for one rotation of the tire changes.

FIG. 5 is a diagram showing a light point of balance of a tire in polar coordinates.

FIG. 6 is a diagram showing the distribution of light points of balance of a tire in polar coordinates.

FIG. 7 is a table showing the results of unbalance measurement and comparison of a tire manufactured by the method of the present embodiment with a tire manufactured by a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Belt material, 2 ... Double width band-shaped piece, 3a, 3b ... Predetermined width band-shaped member, 4a, 4b ... Small winding counter, 5 ... Belt member, 10
... cord, 11a, 11b ... winding drum, 15 ... belt drum.

Claims (3)

[Claims] 1. A method for manufacturing a tire component member in which a band member having a predetermined width is wound on a forming drum and wound and formed, wherein a double-width band member having a width twice as long as the predetermined width is formed. The double-width band-shaped member is cut at the center to form a pair of predetermined width-band members, one of the pair of predetermined width-band members is wound around a forming drum one round and both ends are joined, and the pair of predetermined width-band members are joined. The other predetermined width band-shaped member of the width band-shaped member is overlapped on the wound predetermined width band-shaped member, and is wound around one end from a symmetric position rotated by 180 degrees from the joining portion, and is manufactured by joining both ends. Manufacturing method of a tire constituent member. 2. The tire component according to claim 1, wherein the original component is continuously cut to a double width by a molding machine to form the double component. Production method. 3. The tire component according to claim 2, wherein each of the predetermined width strips obtained by cutting the double width strip at the center is sequentially connected to form the pair of predetermined width strips. Production method.