KR940003190B1 - Building tire - Google Patents

Abstract

The method for manufacturing a tire having more than two kinds of pitch units repeated on the tire tread surface, improves riding comfort by offering uniform wear of the tread and facilitates constant forming by reducing the resistance of small pitch group when forming the tire at the mold. The depth of grooves (2) between tread surfaces (2) becomes shorter when the pitch of the tire (1) is advanced from a large pitch (A) to a small pitch (C). The end section of the groove (3) becomes sharper or stepped by a rotio when the pitch is changing.

Description

Tire manufacturing method

1 is a front view showing a part of a general tire surface.

2 is a cross-sectional view of a mold for manufacturing a conventional tire.

FIG. 3 is a front sectional view showing a groove of the tire manufactured by FIG. 2. FIG.

4 is a cross-sectional skid of a mold for molding a conventional glue part.

5 is a cross-sectional view of a mold for producing a tire of the present invention.

Figure 6a-c is an embodiment showing the tire glue portion produced by the present invention.

7 is a cross-sectional view of an embodiment showing a skid of a mold for manufacturing FIG. 6a.

8 is a cross-sectional view of an embodiment of a skid of a mold for manufacturing FIG. 6b.

9 is a cross-sectional view of an embodiment of a skid of a mold for manufacturing FIG. 6c.

* Explanation of symbols for main parts of the drawings

1: tire 2: ground plane

3: glue

The present invention is to change the shape of the glue portion in accordance with the change in the pitch (Pitch) is repeatedly arranged on the ground plane of the finished tire manufactured by dividing the basic pitch length into at least two types to improve the riding comfort by uniform wear of the ground plane Of course, the present invention relates to a tire manufacturing method that enables uniform molding by reducing the resistance of the peach pitch when the unvulcanized tire is pushed in during the tire manufacturing process.

In general, in the pitch arrangement method in which the tire 1 has at least two lengths of the ground plane 2 and the glue portion 3 as shown in FIG. 1, the pitch (A), the medium pitch (B), and the pitch ( The tires 1, which are arranged in the same manner as C), were manufactured to uniformly shape the resistance of the small and medium pitch group when the unvulcanized tire was pushed into the mold during the manufacturing process.

In the related art, however, the depth of the glue portion 3 is uniformly formed in the skid 11 of the mold 10 regardless of the length of the tire 1 pitch as in FIGS. 2 and 4.

In this way, the glue portion 3 is formed into a mold 10 having a constant skid 11 shape regardless of the pitch of the tire 1 ground plane 2, and thus the pitch (A), the medium pitch (B), and the pitch (C). Tires (1) manufactured uniformly have a deeper glue portion (3) of the pitch (C) depending on the circumferential position of the ground plane (2), so that the ground plane (2) is vulnerable, As the size is different, local tires prevent the entire tire from being used, which in turn reduces the life span of the tire. Also, the power transmission varies depending on the circumferential position in the process of transmitting the power generated from the car engine to the ground. It causes a sense of vibration and causes an abnormal vibration of an actual vehicle.

In addition, in the manufacturing process for manufacturing the tire 1 in which the glue portion 3 of the mass pitch is uniformly formed to a certain depth, the skid 11 of the mold 10 serves as a resistor supporting the expansion of the unvulcanized tire. The large pitch A, which has a relatively long pitch length, has a smaller resistance to support the expansion of the tire 1 than the small pitch C having a short pitch length.

Therefore, irregular pitches, medium pitches, and pitches that are irregularly arranged to reduce noise must be formed in a single pitch with a large pitch and medium pitch in the tire manufacturing mold. ) It was a factor of quality deterioration due to defect

The present invention has been made to solve the above-mentioned conventional drawbacks and problems, and the glue portion of the tire designed by dividing at least two or more pitch lengths is somewhat smaller according to the change in the pitch, medium pitch, and pitch length of the tire, or The aim is to minimize or eliminate the difference in stiffness between the short and long sides by increasing the sharpness of the part that is deep. Another purpose is to arrange the skids of the mold for forming the glue portion of the tire by varying the skids of the mold, such as the shape of the glue portion, according to the formation of the tire glue portion, so that the glue portion of the tire in the production of the unvulcanized tires has a length of the mass pitch The present invention will be described in detail below with reference to the accompanying drawings as to enable uniform molding without changing the unvulcanized center as it is uneven.

In the tire 1 in which the pitch of the ground plane 2 and the glue portion 3 is formed to be large pitch (A), medium pitch (B), and small pitch (C), the ground plane of the tire 1 ( 2) The shape of the glue part 3 formed between 2 is manufactured by changing a depth low toward a large pitch (A), the medium pitch (B), and the small pitch (C).

In another embodiment, the shape of the glue portion 3 formed between the ground planes 2 of the tire 1 is narrowed from the large pitch A to the small pitch C so that the width of the end portion is narrowed to change the sharpness. To be manufactured.

In another embodiment, the shape of the glue portion 3 formed between the ground plane 2 of the tire 1 is manufactured by changing the step and depth at the end portion from the pitch A to the pitch C. .

Reference numeral 10 denotes a mold and 11 a skid.

According to the present invention, the glue portion 3 is formed between the ground surface 2 on the large pitch A, the medium pitch B, and the small pitch C of the tire 1 in the mold 10. According to the shape, several skids 11 are arranged as shown in FIG. 5 so that the pitch length of the tire 1 having two or more kinds of basic pitches of the ground surface 2 and the glue portion 3 of the tire 1 The tire wear is uniformed by making the depth of the glue portion 3 and the glue portion deformed from the large pitch (A) toward the small pitch (C).

In addition, the pitch lengths of the tire 1 ground plane 2 and the glue portion 3 are formed inside the mold at different pitches such as large pitch (A), medium pitch (B), and small pitch (C). The shape of the skid 11 in the mold 10 toward the pitch C is changed to a height change, a sharp degree, and a step of the shape of the tire 1 glue portion 3, and the unvulcanized tire inserted into the mold is bladder. (Not shown) under pressure from the inside to expand to the mold inner surface, the unvulcanized tire (1) that was inflated in the process is the tire ( While contacting the skid (11), such as the shape of the glue portion 3 of 1) is to ensure a uniform expansion without the center of the front and outer circumference of the tire.

As described above, as the pitch of the public place to which the present invention is applied is changed toward the smaller pitch, the shape of the bulru portion is changed to be smaller, so that the amount of deformation occurring in the tread portion becomes uniform due to the external force applied to the tire while driving, and thus uniformity during long time use. The wear life can be obtained, and the driving power of the vehicle can be evenly transmitted to the ground. In particular, the amount of lateral slip that is pushed to the side during turning driving can be uniform, thereby providing a high-quality tire to the driver.

Also, in the manufacturing process of tires, when unmolded tires are molded in a mold, pneumatic tires receive pressure from the inside of the unvulcanized tires through a bladder to be pushed into the molds. The different skids in the mold thus formed eliminate or minimize the difference related to the small and medium pitch length of the expansion resistance, thereby making the tire's molding uniformly without eccentricity, thereby providing a uniform expansion across the power supply.

Claims (4)

In a tire having two or more basic unit pitches of the ground plane of the tire and the glue portion, the glue portion between the ground plane 2 is increased as the pitch length of the tire 1 increases from the large pitch A to the small pitch C. 3) A tire manufacturing method, characterized in that the depth is changed at a low rate. The tire manufacturing method according to claim 1, wherein the end of the glue portion 3 is sharply changed at a constant ratio as the pitch length of the tire 1 increases from the large pitch A to the small pitch C. . The tire according to claim 1, wherein the pitch length of the tire 1 is stepped from the large pitch A to the small pitch C, and the edge of the glue portion 3 is stepped and sharply deformed at a constant ratio. Manufacturing method. The pitch length of the tire 1 is from the large pitch (A) to the small pitch (C), the depth of the shape of the glue portion 3 is lowered, the edge is sharpened, stepped Tire manufacturing method characterized in that the composite applied to change the sharp edge at a constant ratio.