KR100784276B1 - Studless snow tires - Google Patents

Abstract

According to the present invention, the outer intermediate block has a sipe that forms a continuous rib shape in the circumferential direction and forms a repetitive depth in the block, and the direction of the inner lateral groove and the direction of the outer lateral groove are formed opposite to each other. It is related to the winter tires, which have improved performance in winter while securing the equivalent summer performance.

Winter, summer, wet, dry, snow, ice, studs, sipe

Description

Studless snow tire

1 is a view showing a tread pattern of a studless snow tire according to the present invention.

2 is a view showing for comparing the performance evaluation of the tire and the conventional asymmetric tire according to the present invention.

3 is a view showing a tread pattern of a conventional studless snow tire.

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

B1, B2, B3, B4, B5 ---- Block,

L1, L2, L3, L4, L5, L6, L7, L8, L9, L10 ---- width,

P1, P2, P3 ---- pitch, 1, 2, 3, 4 ---- main groove

5, 6, 7, 8 ---- lateral groove

The present invention relates to a studless snow tire. More specifically, the outer rib block has a sipe that forms a continuous rib shape in the circumferential direction and forms a repetitive depth in the block, and the direction of the inner lateral groove and the direction of the outer lateral groove are opposite to each other. The present invention relates to a studless snow tire having improved winter performance while securing summer performance equivalent to that of the existing products.

In Europe, where snow falls and ice forms and melts in winter, and wet roads and dry roads are repeatedly formed, winter tires are important not only for snow and ice performance, but also for dry and wet performance. To date, many tire manufacturers have tried to satisfy the required performance in various ways.

However, in fact, snow-to-ice, dry-to-wet, as well as winter performance and summer performance are strong yield-breaking characteristics, it is true that the product development that satisfies all performance is limited, and moreover, it is equivalent to the summer tire " In the case of winter products that require a speed of V "grade (240 km / h) or more can be said that the limit appears even more, and as an alternative, some asymmetric patterns as illustrated in Figure 3 are introduced, but in winter There are several problems to effectively satisfy both performance and summer performance at the same time.

Accordingly, an object of the present invention is to provide a studless snow tire that improves winter performance while securing summer performance at the same level as existing products.

In the studless snow tire of the present invention, the rib block located on the outside of the tire is formed only in a rib shape without a lateral groove continuously in the circumferential direction, and the shoulder block divided by the rib block and the main groove is a lateral groove. These blocks are each separated by a plurality of sipes repeatedly formed with a constant depth,

The intermediate block and the shredder block located inside the tire are divided by the main groove and the transverse groove, respectively, and the transverse groove of the intermediate block and the transverse groove of the shodder block are discontinuous but are repeatedly applied to these blocks. A plurality of sipes having a constant depth is formed,

The inner and outer shoulder blocks are characterized in that the inner and outer patterns in which the patterns are formed in opposite directions have different asymmetric patterns.

The present invention will be described in more detail based on the accompanying drawings as follows.

1 is a view showing a tread pattern of the studless snow tire according to the present invention, Figure 2 is a view showing to compare the performance evaluation of the tire and the conventional asymmetric tire according to the present invention. In FIG. 1, the right side is the outer side, the left side is the inner side, and the center line (CL) is the center line. That is, the part which lies outside of the vehicle with respect to the tread center line CL in the circumferential direction of the tire is the tire outside, and the part which lies inside of the vehicle with respect to the tread center line CL in the circumferential direction of the tire is the tire inside.

The present invention is a studless snow tire having an asymmetrical pattern having different outer and inner pattern shapes, and as illustrated in FIG. 1, the outer side forms a rib block B2 consisting entirely of ribs without a lateral groove with respect to the circumferential direction. The inner side is characterized in that it consists of a first intermediate block B3 and a second intermediate block B4 divided by second and third lateral grooves 6, 7.

The third tread width L3 of the outer rib block B2 is formed in a range of about 24 to 25% of 1/2 of the total tread width (TW), that is, the width of TW / 2. The fifth, sixth and eighth tread widths L5, L6, L8 defining the inner first intermediate block B3 and the second intermediate block B4 are about 9.3 to 9.7 for the width of TW / 2, respectively. It is preferable to set in the range of%, about 17 to 17.5%, and about 26.5 to 30%.

The outer first shoulder block B1 and the inner second shoulder block B5 are set in opposite directions to each other, and in the case of the outer first shoulder block B1, the outer first shoulder block B1 and the inner second shoulder block B5 are formed in order to increase the dry grip force. The length of one tread width L1 is about 47 to 48% with respect to the width of TW / 2, and in the inner second shoulder block B5, the tenth tread width L10 is equal to the width of TW / 2. It is preferable to set the outer first shoulder block B1 to be larger than the inner second shoulder block B5 in the range of about 35 to 36%.

The same concept allows the width of the first lateral groove 5 to determine the outer first shoulder block B1 to be determined within a range of about 14 to 15.5% of the total width of each pitch P1, P2, P3. , About 17.7 to 18.2% for each pitch (P1, P2, P3) to improve the water drainage performance and snow traction of the fourth transverse groove (8) which determines the inner second shoulder block (B5). It is preferable to set within the range of to set the inner side wider than the outer side.

The second, fourth, seventh, and ninth lateral groove widths (L2, L4, L7, and L9) of the circumferential main groove, which are the main factors of wet and snow performance, are about 9% and about 10 for TW / 2, respectively. %, About 10% and about 10%, the width of the outer shoulder part main groove is slightly narrow.

The longitudinal widths of the second and third lateral grooves 6 and 7 forming the interface of the inner first and second intermediate blocks B3 and B4 are about 3.5 to 4% and about 12 to about each pitch width. It is set in the range of 2.5%, and the smooth drainage performance is discontinuous from each other in the second and third lateral grooves 6 and 7 and the show rate portion fourth lateral groove 8 in order to maximize snow traction performance. It is preferable to form.

The depth of each of the first to fourth main grooves 1, 2, 3, and 4 is most effective in the range of about 8.5 to 9.5 mm, and when the summer performance is emphasized, the depth is reduced to about 7.5 to 8.5 mm. Good to do.

According to the invention, the depth of the third sipe S3, which is arranged at the edge of the first shoulder block B1, in particular among the sipes of each block, in order to maximize the effect, is about 55 times the depth of the fourth main groove 4. To 60%, in the case of the fourth sipe S4 disposed at the edge of the first shoulder block B1, it is preferable to set it to about 76 to 82% of the fourth main groove 4, and the rib block in the same concept. In the case of the fifth sipe S5 disposed at the edge of the first sipe S1 and the second shoulder block B5 disposed at (B2), the fourth main groove 4 has the same level as the third sipe S3. The fourth sipe S6 disposed at the edge of the second sipe S2 and the second shoulder block B5 disposed in the rib block B2 and the fourth sipe S6 disposed at the edge of the rib block B2. It is preferable to set it at about 76 to 82% of the fourth main groove 4 at the same level as the sipe S4. It is. The direction, position, etc. of the sipe within the block is the same as the sipe design of a typical winter tire to maintain the rigidity of the block, the depth of which is usually low as described above, and the deep sipe is applied simultaneously to one block. Do it.

In addition, it is effective to set the first to third angles A1, A2, and A3 of each inner block in the range of about 3 to 8 degrees to improve the wet and snow performance.

The studless snow tire according to the present invention has the advantage of effectively improving snow and ice performance while maintaining dry and wet performance as compared to conventional asymmetric tire products (FIG. 3) as shown for performance evaluation in FIG. 2.

Claims (6)

The rib block B2 on the outside of the tire lying on the outside of the vehicle on the basis of the tread center line CL in the tire circumferential direction is made only in a rib shape without a lateral groove in the circumferential direction continuously, and the rib block B2 The first shoulder block B1 divided by the fourth main groove 4 and the first shoulder block B1 are divided by the first lateral groove 5, respectively, and the first shoulder block B1 and the rib block B2 are separated from each other. A plurality of first to fourth sipes (S1, S2, S3, S4) having a constant depth is formed repeatedly in the The first and second intermediate blocks B3 and B4 and the second showr block B5 on the inner side of the tire lying on the inner side of the vehicle based on the tread center line CL in the tire circumferential direction are the first to third main grooves. (1, 2, 3) and second to fourth transverse grooves (6, 7, 8), respectively, separated by the second and third transverse of the first and second intermediate blocks (B3, B4) The directional grooves 6 and 7 and the fourth lateral grooves 8 of the second shoulder block B5 are discontinuous but have a plurality of repetitively constant depths in these first and second intermediate blocks B3 and B4. Five fifth and sixth sipes S5 and S6 are formed, The inner and outer first and second shoulder blocks (B1, B5) is a studless snow tire having a different asymmetrical pattern of the inner and outer patterns, characterized in that the pattern is formed in the opposite direction to each other. The third tread width L3 in the rib block B2 on the outside of the tire has a range of 24 to 25% with respect to the width of TW / 2, and the first intermediate block B3 on the inside of the tire. The fifth tread width L5, the sixth tread width L6, and the eighth tread width L8 of the second intermediate block B4 are 9.3 to 9.7%, 17 to 17.5%, and 26.5 for TW / 2, respectively. Studless snow tire, characterized in that it has a range of 30% to 30%. 2. The first tread width (L1) in the outer first shoulder block (B1) has a range of 47 to 48% with respect to the width of TW / 2, and the inner second showr block ( The tenth tread width (L10) in B5) is in the range of 35 to 36% with respect to the width of TW / 2. The width of the first lateral grooves 5 for dividing the outer first show rater block B1 is in the range of 14 to 15.5% with respect to the overall width of each pitch P1, P2, P3. The width of the fourth lateral groove 8 for dividing the inner second show rate block B5 is set in the range of 17.7 to 18.2% with respect to the pitches P1, P2, and P3. Studless snow tires. 2. The second transverse groove width (L2) of the fourth main groove (4), the fourth transverse groove width (L4) of the first main groove (1), the second main groove (1). The seventh lateral groove width L7 of 2) and the ninth lateral groove width L9 of the third main groove 3 are 9%, 10%, 10% and 10% for TW / 2, respectively. Studless snow tires, characterized in that set. The depth of the third sipe (S3) disposed at the edge of the first shoulder block (B1) is 55 to 60% of the depth of the fourth main groove (4), the first shoulder block (B1). In the case of the fourth sipes S4 disposed at the edges of the first sipes S4, the first sipes S1 and the second sipes S2 arranged in the rib block B2 are set at a level of 76 to 82% of the fourth main grooves 4. The fifth sipe S5 disposed at the edge of the shoulder block B5 is 55 to 60% of the depth of the fourth main groove 4, which is equivalent to the third sipe S3, and the rib block B2. The second sipe S2 disposed therein and the sixth sipe S6 disposed at the edge of the second shoulder block B5 have a depth equal to that of the fourth sipe S4. Studless snow tires, characterized in that set to 76 to 82% of the.

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