KR20070025784A - Heavy duty pneumatic radial tire - Google Patents

Abstract

A pneumatic radial tire for heavy load is provided to reduce abrasion of a surface of a tread and improve durability of the tire, by absorbing and attenuating force applied to the tread by a heat radiation unit. A pneumatic radial tire for heavy load comprises a belt part(110) and a heat radiation unit(130). The belt part comprising plural sheets of belts(112) is disposed between a carcass(102) and a tread(120). The heat radiation unit radiates heat generated by bending and stretching motions of the belt part. The heat radiation unit comprises a side groove(132) and plural radiating ribs(134) formed in the side groove. The side groove is formed on a tread side(124). The radiating ribs are formed at predetermined pitches along circumferences of plural concentric circles on the side groove. The radiating ribs are arranged parallel with one another or in zigzags. Sectional shapes of the radiating ribs are square, parallelogram, or mixed arrangement of those figures. An end of the innermost radiating rib and an end of the outermost radiating rib are placed on a lower surface extension line(L1) of a lowermost belt(112a) and an upper surface extension line(L2) of an uppermost belt(112d), respectively.

Description

Heavy-duty pneumatic radial tires {HEAVY DUTY PNEUMATIC RADIAL TIRE}

1 is a partial sectional view showing an example of a conventional pneumatic radial tire for heavy load.

2 is a partial cross-sectional view showing an example of a heavy-load pneumatic radial tire according to the present invention.

3 to 5 are enlarged views showing examples of heat dissipation means applied to a heavy-load pneumatic radial tire according to the present invention, respectively.

Fig. 6 is a side view showing a pneumatic radial tire for a heavy load according to the present invention.

7 to 10 are views showing the shape and arrangement of the heat dissipation ribs Rib applied to the heavy-load pneumatic radial tires according to the present invention, respectively.

<Explanation of symbols for the main parts of the drawings>

102: carcass, 110: belt portion,

112: belt, 112a: lowest layer belt,

112d: top layer belt, 120: tread,

130: heat dissipation means, 132: side groove (Side Groove),

134: Radiating Rib,

A: the angle between the outer inclined surface of the side groove and the outer surface of the tread side,

DP1: depth of side grooves,

L1: extension bottom of bottom belt,

L2: top extension of top belt,

P: Pitch of heat dissipation rib,

W1: distance between the end of the outermost heat dissipation rib and the outer inclined surface of the side groove,

W2 is the distance between the end of the innermost heat dissipation rib and the inner inclined surface of the side groove.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty pneumatic radial tire, and in particular, it is possible to dissipate heat accumulated in the belt portion inside the tread without radiating to the tread side and absorb and reduce the force applied to the tread. The present invention relates to a pneumatic radial tire for a heavy load capable of improving the durability of a tire.

Generally, in the case of heavy-loaded pneumatic radial tires that are subjected to heavy loads such as tires for trucks or buses, the carcass 20 and the tread 10, as shown in FIG. A belt portion 30 composed of long belts 32 is laminated to reinforce the tire.

In such a heavy-load pneumatic radial tire, the thickness of the outer side of the tread 10, that is, the tread shoulder 12 is thickened. Therefore, when the tire is running, when a high load is applied to the tread 10, the force is transmitted directly to the outer ground plane of the tread 10, that is, the ground plane of the tread shoulder 12, thereby causing abnormal wear on the tire. cause. This causes the tire to be replaced even though the tread 10 is not completely worn.

In addition, when the vehicle is running, heat generated by the stretching movement of the belts 32 is not easily dissipated to the outside, and is easily accumulated on the tread shoulder 12, so that the temperature of the tread shoulder 12 rises to 150 ° C or more. For example, when the temperature of the tread shoulder 12 reaches 90 ° C. or more, the tensile strength of the rubber drops sharply, which causes cracks at the edges of the belts 32. This crack rapidly progresses along the layers of the belts 32 to cause belt separation, which causes a tire accident.

Therefore, it is necessary to heat dissipate so that the internal temperature of the tire does not reach a safe system temperature. As the representative technology thereof, those disclosed in Korean Patent Laid-Open Publication No. 1996-10282 can be mentioned.

In the prior art, it is disclosed that the tread shoulder is composed of a low heat generating rubber composition, which is effective in reducing heat generated in the tread shoulder itself, but in dissipating heat generated by the stretching movement of the belts to the outside. There is a limit.

In addition, Korean Patent Laid-Open Publication No. 1997-64992 discloses a technique in which a heat dissipation tube in which a high boiling point liquid is injected is disposed at an appropriate position inside a tire, for example, between a belt layer or a position surrounding a belt edge.

By the way, in the prior art, the heat dissipation tube can absorb the heat generated by the stretching movement of the belts, but there is a limit, if the heat exceeds the absorption limit, the heat will eventually accumulate in the tread shoulder There is this. In addition, in order to apply the heat dissipation tube, a manufacturing process is inevitably added, resulting in a decrease in productivity, and a manufacturing cost increases due to the addition of parts.

In addition, in the above prior arts, when a high load is applied to the tread, the load is transmitted to the outer ground surface of the tread as it is, causing abnormal wear on the tire, and thus the tire is not worn out completely. It has the problem of having to exchange it.

The present invention has been made in view of the above-mentioned conventional problems, and can radiate heat accumulated in the tread side without being radiated to the tread side, and absorb and reduce the force applied to the tread. It is an object to provide a pneumatic radial tire for a heavy load.

In order to achieve the above object, the present invention, the belt portion consisting of a plurality of belts are stacked between the carcass and the tread, heavy-loaded pneumatic radiator having a heat dissipation means for dissipating heat generated by the stretching movement of the belt portion In an AL tire, the heat dissipation means includes a side groove formed on a tread side and a plurality of radiating ribs formed at predetermined pitch intervals in the circumferential direction along a plurality of concentric circles on the side groove. It is characterized by comprising a).

According to the present invention, each of the heat dissipation ribs formed along concentric circles adjacent to each other may be arranged in a side-by-side shape or in a zigzag shape.

In addition, the heat dissipation ribs may be formed in a rectangular or parallelogram cross-sectional structure, and they may be mixed and arranged.

In addition, the ends of the innermost heat dissipation ribs and the ends of the outermost heat dissipation ribs of the heat dissipation ribs are respectively placed on the bottom extension line of the bottom belt and the top extension line of the top belt.

The depth of the side grooves is in the range of 2 to 15 mm, the heat radiation ribs may be formed in the same or different depths at the depth of the range, the angle between the outer inclined surface of the side groove and the outer surface of the tread side Is preferably in the range of 15 ° to 130 °.

The distance between the end of the outermost heat dissipation rib and the outer inclined surface of the side groove and the distance between the end of the innermost heat dissipation rib and the inner inclined surface of the side groove are preferably 15 mm.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of terms in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

2 and 6, a pneumatic radial tire for a heavy load according to the present invention is shown.

As shown in FIG. 2, a carcass 102 is stacked on the outer side of the tire inner part 100, and a plurality of sheets (here four are illustrated) are formed on the outer circumferential surface of the carcass 102. The belt part 110 made up is laminated. In addition, the tread 120 is stacked outside the belt unit 110. Reference numeral 106 denotes a bead portion for mounting the tire on the tire wheel, and reference numeral 104 denotes a sidewall constituting the side of the tire.

The heavy-load pneumatic radial tire according to the present invention includes a heat dissipation means 130 for dissipating heat generated by the stretching movement of the belt unit 110 when the tire is running.

As shown in FIGS. 2 and 6, the heat dissipation unit 130 is formed on a tread side 124 (specifically, a side of the tread shoulder 122) constituting the side of the tread 120. 132 and a plurality of heat dissipation ribs 134 formed on the side grooves 132.

The heat dissipation ribs 134 may be formed at a predetermined pitch P in the circumferential direction along the plurality of concentric circles C (see FIGS. 6 to 10) in the side groove 132.

According to the present invention, as shown in FIGS. 2 to 5, the ends of the innermost heat dissipation ribs 134 and the ends of the outermost heat dissipation ribs 134 of the heat dissipation ribs 134 are respectively formed in the belt part ( The bottom extension line L1 of the lowest layer belt 112a and the upper surface extension line L2 of the uppermost belt 112d among the 110 layers.

3 to 5, the depth DP1 of the side groove 132 is preferably in a range of 2 to 15 mm. The heat dissipation ribs 134 may be formed to have the same or different depths at the depth DP1 of the range. 3 shows an example in which the heat dissipation ribs 134 are formed to have the same depth, and FIGS. 4 and 5 illustrate examples in which the heat dissipation ribs 134 are formed to different depths.

In addition, the angle A between the outer inclined surface of the side groove 132 and the outer surface of the tread side 124 is preferably in the range of 15 ° to 130 °.

In addition, it is preferable that the distance W1 between the end of the outermost heat dissipation rib 134 of the heat dissipation ribs 134 and the outer inclined surface of the side groove 132 is 15 mm. In addition, it is preferable that the distance W2 between the end of the innermost heat dissipation rib 134 of the heat dissipation ribs 134 and the inner inclined surface of the side groove 132 is 15 mm.

According to the present invention, the heat dissipation ribs 134 may be formed in parallel with each other in the circumferential direction along each concentric circle C, as shown in FIGS. 6 to 8 and 10. In addition, the heat dissipation ribs 134 may be arranged in a zigzag shape with each other along concentric circles C adjacent to each other, as shown in FIG. 9.

In addition, the heat dissipation ribs, as shown in Figure 7 may be formed in a rectangular cross-sectional structure, as shown in Figure 8 and 9 may be formed in a cross-sectional structure of a parallelogram, as shown in Figure 10 Likewise, rectangular and parallelogram cross-sectional structures can be mixed and arranged.

Next, the operation of the heavy-load pneumatic radial tire according to the present invention configured as described above will be described.

In the present invention, the heat dissipation means 130 formed on the tread side 124 may be formed, for example, when the tread 120 is molded.

When the tire provided with the heat dissipation means 130 as described above is applied to a heavy load vehicle such as a truck or a bus, the tension / compression force applied to the tread 120 is the outer ground surface of the tread 120 immediately. That is, the tread shoulder 122 is transmitted to the ground plane, but in the present invention, since the heat dissipation means 130 including the side grooves 132 and the plurality of heat dissipation ribs 134 is installed in the tread side 124, The force is absorbed and reduced by the heat radiating means 130.

Therefore, abnormal wear on the surface of the tread 120 may be reduced.

In addition, when the tire is running, the belt unit 110 is stretched along with the stretching action of the sidewall 104, and this stretching movement generates a lot of heat in the belt unit 110. In the present invention, the belt Since heat generated in the unit 110 is radiated to the outside through the heat dissipation means 130, heat is not accumulated in the belt unit 110 and the tread shoulder 122. That is, by the side groove 132 constituting the heat dissipation means 130 and the heat dissipation surface area by the plurality of heat dissipation ribs 134 remarkably increased, heat generated in the belt part 110 can be effectively dissipated to the outside. have.

Accordingly, since the tensile strength of the rubber is sharply dropped due to the high temperature, cracks may be prevented from occurring at the edges of the belts 112, thereby preventing the belt 112 separation phenomenon from occurring.

According to the heavy-load pneumatic radial tire according to the present invention configured as described above, the force applied to the tread 120 by the heat dissipation means 130 consisting of a side groove 132 and a plurality of heat dissipation ribs 134 Since it can absorb and reduce, it is possible to reduce abnormal abrasion of the surface of the tread 120, thereby improving the durability of the tire.

In addition, since the heat generated by the stretching movement of the belt unit 110 during tire travel can be radiated to the outside smoothly through the surface area widened by the side groove 132 and the plurality of heat dissipation ribs 134, the belt unit ( Heat does not accumulate in the 110 and the tread shoulder 122. Therefore, the separation phenomenon of the belt 112 may be prevented from occurring due to the cracks generated at the edges of the belts 112 due to the high temperature, thereby further increasing the durability of the tire.

In addition, since the heat dissipation means 130 may be formed when the tread 120 is formed, a separate part for heat dissipation is not required. Therefore, in manufacturing a tire that can be heat-dissipated, the assembly labor and the number of parts can be reduced, so that not only the tire productivity can be increased but also the manufacturing cost can be reduced.

Claims (6)

Heat dissipation means for dissipating heat generated by the stretching movement of the belt portion is laminated belt portion 110 consisting of a plurality of belts (Belt, 112) between the carcass (102) and the tread (Tread, 120) In a heavy load pneumatic radial tire having (130): The heat dissipation means may include a plurality of side grooves 132 formed on the tread side 124 and a plurality of grooves formed at a predetermined pitch P in the circumferential direction along a plurality of concentric circles C in the side grooves. A heavy-duty pneumatic radial tire, comprising: a radiating rib 134. The method of claim 1, The heat dissipation ribs 134, which are formed along concentric circles C adjacent to each other, are arranged in a side-by-side or zigzag form. The method according to claim 1 or 2, The heat dissipation ribs may be formed in a rectangular or parallelogram cross-sectional structure, or they may be arranged in a mixed manner. The method of claim 1, The ends of the innermost heat dissipation ribs and the ends of the outermost heat dissipation ribs of the heat dissipation ribs 134 are extended to the bottom surface extension line L1 of the lowest layer belt 112a and the upper surface extension line of the uppermost belt 112d. A heavy-duty pneumatic radial tire, which is placed at (L2). The method of claim 1, The depth DP1 of the side groove 132 is in a range of 2 to 15 mm, and the heat dissipation ribs are formed to have the same or different depths at the depth of the range, and the outer inclined surface of the side groove 132 is different. A heavy-load pneumatic radial tire, characterized in that the angle A between the outer surfaces of the tread side 124 is in the range of 15 ° to 130 °. The method of claim 1, The distance W1 between the end of the outermost heat dissipation rib 134 and the outer inclined surface of the side groove 132 and the distance W2 between the end of the innermost heat dissipation rib 134 and the inner inclined surface of the side groove 132. The pneumatic radial tire for heavy loads, characterized in that each is 15mm.

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