KR100459790B1 - A Pneumatic Radial Tire for Heavy Duty with 5Ribs - Google Patents

Abstract

The present invention optimizes the pattern of the tire tread so that foreign matter does not get caught in the groove, and at the same time improves the performance of dry traction and wet traction generated when the tread is grounded with the road surface. It relates to a five-ribbed heavy duty pneumatic tire. The technical configuration is a center rib 10 formed circumferentially in the center of the tire tread, and side grooves 21 formed on both outer sides of the center rib 10, respectively, and lateral ribs formed circumferentially outward thereof. A heavy-loaded pneumatic body having five ribs including a 20 and a shoulder rib 30 formed in the outer side of the side rib 20 and formed in the circumferential direction thereof; In the tire, the center groove (11) is formed along the center circumferential direction of the center rib (10), and the inside of the lateral groove (21) is characterized in that it is configured to include a foreign matter jamming projection (22). .

Description

A Pneumatic Radial Tire for Heavy Duty with 5Ribs}

The present invention optimizes the pattern of the tire tread so that foreign matter does not get caught in the groove, and at the same time improves the performance of dry traction and wet traction generated when the tread is grounded with the road surface. A heavy duty pneumatic radial tire having five ribs.

A typical one of the tread patterns of a conventional heavy-duty pneumatic tire for steering is characterized by forming five ribs. That is, the conventional heavy-duty pneumatic radial tire having five ribs has a center rib formed in the center of the tread in the circumferential direction, and lateral grooves formed on both outer sides of the center rib and formed in the circumferential direction on the outside thereof. And ribs forming shoulder grooves formed on both outer sides of the side ribs and formed in the circumferential direction on the outer side thereof.

However, the conventional five-ribbed heavy-duty pneumatic radial tire has some problems.

First, foreign matters such as stones and iron are stuck in the side grooves while driving. This causes foreign matters to be embedded in the grooves, causing damage to the tread bottom to the belt portion inserted into the tread, resulting in damage to the tire.

Second, the performance of the dry traction and the upper traction, which is a ground state between the tread and the road surface while driving the tire, has a bad effect on the driving force and braking force.

Third, irregular wear is severely generated in the lateral ribs among the five ribs, which leads to premature wear of the tire and eventually shortens the life of the tire.

SUMMARY OF THE INVENTION An object of the present invention is to provide a five-ribbed heavy-duty pneumatic radial tire which prevents foreign matters such as stones and metals from getting stuck in the side grooves while driving.

It is another object of the present invention to provide a five-ribbed heavy-duty pneumatic radial tire that improves the performance of dry traction and upper traction that is grounded between the tread and the road surface while the tire is running.

It is still another object of the present invention to provide a five-ribbed heavy-duty pneumatic radial tire that can prevent irregular tread wear.

1 is a front view of a tire according to the present invention,

2 is a partially enlarged plan view of a tire according to the present invention;

3 is a partial cross-sectional view of a tire according to the present invention;

4 is a partially enlarged cross-sectional view of a tire according to the present invention;

5 is a sectional view showing a lateral groove of a tire according to the present invention;

6 is a sectional view showing a shoulder groove of a tire according to the present invention;

7 is a cross-sectional view showing a one-stage sipe formed on the center rib of the tire according to the present invention;

8 is a cross-sectional view showing a two-stage sipe formed on the center rib of the tire according to the present invention;

9 and 10 are cross-sectional views showing both end portions of the lateral grooves formed in the side ribs of the tire according to the present invention;

11 is a cross-sectional view showing a one-stage sipe formed on the side ribs of a tire according to the present invention;

12 is a cross-sectional view showing a two-stage sipe formed on the shoulder rib of the tire according to the present invention.

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

100: tire, 10: center rib,

11: center groove, 20: lateral rib,

21: side groove, 22: foreign matter jamming projection,

30: Shoulder rib 31: Shoulder groove.

The five-rib heavy-duty pneumatic radial tire of the present invention for achieving the above technical problem, the center ribs formed in the circumferential direction in the center of the tire tread, and forming side grooves on both outer sides of the center ribs, respectively In the heavy-load pneumatic tire having a side rib formed in the circumferential direction, and the shoulder ribs formed on both outer sides of the side ribs and a shoulder rib formed in the circumferential direction on the outer side thereof. And forming a center groove along a center circumferential direction of the center rib, and including a stone pinching protrusion inside the side groove.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a front view of a tire according to the present invention, Figure 2 is a plan view showing a part of the tread of the tire according to the present invention, Figure 3 is a cross-sectional view showing a tread according to the present invention.

As shown in FIGS. 1 to 3, the 5-rib heavy-load pneumatic tire 100 of the present invention includes a center rib 10 having a center groove 11 and a side rib having a side groove 21. 20 and a shoulder rib 30 having a shoulder groove 31.

Hereinafter, the structural parts of the present invention will be described in detail.

2 and 3, the center rib 10 is a structural portion formed in the center of the tire tread in the circumferential direction. It is necessary to form the center groove 11 along the center circumferential direction of the center rib 10. The center groove 11 improves the performance of dry traction and upper traction which affects the grounding state between the tread and the road surface while the tire is running.

Meanwhile, as shown in FIG. 2, sipes are formed at both side portions of the center rib 10, and the first stage sipes 12 and the second stage sipes 13 are continuously formed at mutually staggered positions.

Here, as shown in Fig. 7, the one-stage sipe 12 preferably has a width W3 of about 16-18% with respect to the width W1 of the side grooves 21, and the depth D3 is As for the depth D of the lateral groove 21, about 90-92% is preferable.

In addition, as shown in Fig. 8, the two-stage sipe 13 preferably has a width W4 of about 17-19% with respect to the width W1 of the side groove 21, and the depth of the first stage ( D2) is preferably about 90-92% of the depth D of the side grooves 21, and the depth D1 of the second stage is about 24-26% of the depth D of the side grooves 21. desirable.

As shown in FIGS. 2 and 3, the lateral ribs 20 are separated from the center ribs 10 by the lateral grooves 21 and are formed in the circumferential direction on the outer side of the lateral grooves 21.

Here, the lateral grooves 21 are formed on both outer sides of the center rib 10 in the circumferential direction, respectively, as shown in FIG. 5, the width W1 of the lateral grooves 21 is the width of the tread TW. It is preferable to form about 5-6% and groove cross-sectional angle A1 about 7-10 degrees with respect to (refer FIG. 1, FIG. 2).

In particular, it is necessary to form the foreign matter jamming projections 22 so that foreign matters do not get stuck inside the side grooves 21. At this time, the height SD1 of the foreign matter jamming prevention projections 22 is the depth of the side grooves 21. About 19-21% is preferable with respect to (D), and the width SW1 of the foreign matter pinching prevention protrusion is about 24-26% with respect to the width W1 of the side groove 21.

Meanwhile, as shown in FIG. 2, the lateral ribs 20 are formed with lateral grooves 23 and sipes 24, 25, and 26. The lateral grooves 23 are formed in two stages slightly inclined with respect to the direction of the central axis of the tire, and both ends thereof are opened to the side grooves 21 and the shoulder grooves 31, respectively.

FIG. 9 shows a cross section of the lateral groove 23 toward the side groove 21, and FIG. 10 shows a cross section of the lateral groove 23 toward the shoulder groove 31. At this time, the first stage depth D5 of the lateral groove 23 is preferably about 90-92% of the depth D of the side groove 21 or the shoulder groove 31, and the second stage depth D4. Is preferably about 15-16% with respect to the depth D of the side groove 21 or the shoulder groove 31, and the width thereof is preferably 2-3 mm. Such a lateral groove 23 serves to prevent the development of the lateral rib 20 when abnormal wear occurs, and also to improve the performance of the dry traction and the upper traction.

In addition, as shown in FIG. 2, single side sipes 24 and straight sipes 25 are formed on both side portions of the side ribs 20, and longitudinal sipes 26 are formed on the inner surface of the side ribs 20. To form.

Here, the one-stage sipe 24 is the same as the cross section of the one-stage sipe 12 formed in the center rib demonstrated by FIG. 7 as shown in FIG. That is, the width W3 of the one-stage sipe 24 is preferably about 16-18% of the width of the shoulder groove 31, and the depth D3 is the depth D of the shoulder groove 31. About 90-92% is preferable.

In addition, although not shown in cross section, the straight sipe 25 and the longitudinal sipe 26 are formed in the same depth as the depth of the shoulder groove 31. As shown in FIG.

2 and 3, the shoulder ribs 30 are separated from the side ribs 20 by the shoulder grooves 31 formed on the outer side of the side ribs 20, and the shoulder grooves 31 of the shoulder grooves 31 are separated from each other. It is a structural part formed in the circumferential direction on the outer side.

Here, the shoulder groove 31 is preferably formed inside the end portion of the uppermost belt 40 stacked in the tire, as shown in FIG. It is most secure in structure to form the shoulder groove 31 inside the end of the uppermost belt 40. That is, when the shoulder groove 31 is positioned above the end of the uppermost belt 40, stress concentration occurs at the end of the belt 40 at the ground and ground. In addition, when the shoulder groove 31 is located outside the end of the uppermost belt 40, the radius of the tread is severely formed in the air-injected finished tire, resulting in irregularity of the shoulder rib 30 and the side rib 20. It causes wear. Therefore, it is most secure in structure to form the shoulder groove 31 inside the end of the uppermost belt 40.

In addition, the width W2 of the shoulder groove 31 is preferably about 4-6% with respect to the tread width TW (see Figs. 1 and 2), as shown in Fig. 6, and the cross-sectional angle A1. ) Is preferably 12-15 °. On the other hand, the side grooves 21 are formed with foreign matter pinching protrusions 22, but the shoulder grooves 31 do not form foreign matter pinching protrusions, which are caused by injecting air into the tires of the shoulder grooves 31. This is because the width becomes wider than the width of the lateral grooves 21, and the groove cross-sectional angle is large.

On the other hand, as shown in FIG. 2, the one-step sipe 32, the two-step sipe 33, and the single-shaped sipe 34 are continuously formed in the shoulder groove 31 side of the shoulder rib 30. As shown in FIG.

Here, the one-stage sipe 32 is not shown in the cross section, but is the same as the one-stage sipe 24 formed in the side groove 20 demonstrated by FIG. That is, the width of the single-stage sipe 32 is preferably about 16-18% of the width of the shoulder groove 31, W2, and the depth thereof is 90-92% of the depth D of the shoulder groove 31. Degree is preferred.

As shown in FIG. 12, the two-stage sipe 33 has a width W5 of about 19-21% with respect to the width W2 of the shoulder groove 31, and the depth D2 of the first stage is It is preferable that the depth D1 of about 90-92% with respect to the depth D of the shovel groove 31, and the depth D1 of the 2nd stage be about 24-26% with respect to the depth D of the shoulder groove 31. Do.

This is equal to the depths D1 and D2 of the two-stage sipes 13 formed in the center rib 10 described with reference to FIG. 8, except that the width W5 of the sipe 33 is the width W2 of the shoulder groove 31. About 19-21% with respect to a little wider.

As described above, the sipes 12, 13, 24, 25, 26, 32, 33, and 34 formed on each of the ribs 10, 20, 30 are dry tires. It improves the performance of the traction and the upper traction, while preventing the tread from being worn irregularly.

On the other hand, as shown in Figure 4, it is preferable to form a convex portion 35 having a predetermined curvature on the outer side of the shoulder rib 30 so as to disperse the stress during running. As shown in FIG. 4, the convex portion 35 is formed as an arc of curvature passing through the point A, which is the tread end, and the point B, which is reached when the top belt 40 is extended.

In the figure, TW is the width of the tire tread, CW is the width of the center rib, RW is the width of the side rib, and SHW is the width of the shoulder rib.

As described above, the five-ribbed heavy-duty pneumatic tire of the present invention can prevent the stones or metal parts from getting stuck by forming foreign matter pinching protrusions in the side grooves.

In addition, by forming a center groove in the center of the center rib in the circumferential direction, and by forming various types of sipes on the side surface of each rib, it improves the performance of dry traction and upper traction between the tread and the road surface while the tire is running. On the other hand, it has the effect of preventing irregular wear of the tread.

Claims (14)

delete Center ribs 10 formed circumferentially in the center of the tire tread, center grooves 11 formed along the center circumferential direction of the center ribs 10, and lateral sides of both sides of the center ribs 10, respectively. Side ribs 20 formed in the circumferential direction on the outer side of the grooves 21 and the foreign matter jamming projection 22 formed in the side grooves 21, and the outer side of the side ribs 20 In the heavy-duty pneumatic radial tire having a five rib formed by forming a shoulder groove 31 formed in the outer side and a shoulder rib 30 formed in the circumferential direction thereof, The two-stage sipe (12) and the two-stage sipe (13) are continuously formed on both side portions of the center rib (10), 5-rib heavy-load pneumatic radial tire. The method of claim 2, The one-stage sipe 12 has a width W3 of 16-18% of the width W1 of the side groove 21, and a depth D3 of the first step sipe 12 of the side groove 21 with respect to the depth D of the side groove 21. A 5-rib heavy-duty pneumatic radial tire, characterized in that formed at 90-92%. The method of claim 2, The two-stage sipe 13 has a width W4 of 17-19% with respect to the width W1 of the lateral groove 21, and the depth D2 of the first stage sipe 13 has a depth D of the lateral groove 21. 90-92% with respect to the depth D1 of the two stages is formed with 24-26% with respect to the depth (D) of the side groove (21). delete The method of claim 2, The side ribs 20 are formed with a lateral groove 23, a one-stage sipe 24 and a straight sipe 25, a five-ribbed heavy-duty pneumatic radial tire. delete The method of claim 6, The one-stage sipe 24 has a width W3 of 16-18% of the shoulder groove 31 width W2 and a depth D3 of the shoulder groove 31 with respect to the depth D of the shoulder groove 31. A 5-rib heavy-duty pneumatic radial tire, characterized in that formed at 90-92%. delete delete The method of claim 2, One side of the shoulder rib 30, one-stage sipe 32, two-stage sipe 33 and one-shaped sipe 34, characterized in that continuously forming a five-ribbed heavy-duty pneumatic radial tire. The method of claim 11, The one-stage sipe 32 has a width of 16-18% of the width of the shoulder groove 31 and the depth W2 of the shoulder groove 31. The depth of the groove groove 31 is 90-92%. Features 5 pneumatic radial tires for heavy loads. The method of claim 11, The two-stage sipe 33 has a width W5 of 19-21% with respect to the width W2 of the shoulder groove 31, and a depth D2 of the first stage sipe 33 has a depth of the shovel groove 31. 90-92% with respect to (D), and the depth D1 of the two stages is formed with 24-26% with respect to the depth D of the shoulder groove 31. tire. delete