KR950012253B1 - Pneumatic tire - Google Patents

Abstract

The pneumatic tire for increasing the water discharging ability on the wet road and running ability on the dry road, has an unit block(30) formed by the main grooves(10, 11, 12) and the traverse grooves(20-23). The traverse grooves formed between the upper brim of one unit block and the facing lower brim of the other unit block, are gradually widened from the center of the tire to the shoulder section(6). The depth of the traverse grooves is gradually deepened from the center to the shoulder section.

Description

Pneumatic tire

1 is a plan view of one embodiment of the present invention.

2 is an explanatory view of the lateral groove width of the tire of the present invention shown in FIG.

3 is an explanatory view of the lateral groove depth of the tire of the present invention shown in FIG.

* Explanation of symbols for main parts of the drawings

10,11,12: Main groove 20,21,22,23: Horizontal groove

30: block 4: front ground edge

41,42,43: step 5: opposite side

6: shoulder

The present invention relates to a pneumatic tire that can achieve a satisfactory running performance even on a dry general road while improving the drainage performance in rain.

In order to achieve excellent driving performance in the rain, it is necessary to form a large groove in the tire tread to facilitate drainage.

However, improving drainage performance is not enough to form a lot of deep and deep grooves.

This reduces the contact area between the tire and the road surface, thus weakening the traction and lowering the rigidity of the block, which can significantly reduce the running performance and braking force (commonly referred to as "Dry performance") on the general road.

Therefore, it is necessary to improve the drainage performance within a range that does not impair the driving performance (Dry performance) on the general road.

Accordingly, the present invention improves the lateral groove shape in the tire tread pattern while improving the drainage performance during rain driving, while not deteriorating the running performance on a general road.

That is, in the present invention, in forming a block by a plurality of jugbours extending in the circumference of the tire and a plurality of horizontal grooves intersecting the main groove, the width and depth of the horizontal grooves are defined by the tread center of the tire. In the direction of the tread edge (Edge) in the direction of forming a wider and deeper to improve the drainage performance greatly, in particular, in the width of the horizontal grooves to increase the width of the horizontal grooves by gradually increasing the width of the front grooves of the block. When described with reference to the accompanying drawings showing a preferred embodiment of the following.

By a plurality of main grooves 10, 11, 12 extending in the circumference of the tire, and a plurality of lateral grooves 20, 21, 22, 23 intersecting with the main grooves 10, 11, 12. In the block 30 to be formed, the front ground edge 4 which is first grounded with the ground in accordance with the rotation of the variable tire of each unit block 30 in contact with the lateral grooves 20, 21, 22, 23... It is divided into three and formed into three steps (41, 42, 43), the width of the center of the tire center (W1) of the unit lateral grooves (20, 21, 22, 23) that each block is formed, that is, the first step And the distance between the opposite side 5 is approximately 1/15 of the unit pitch P of the block 30, and the unit width W2, which is the distance between the second step 42 and the opposite side 5, is a unit. The unit block is made to be about 2/15 of the pitch P, and the outer width W3, which is the distance between the third step 41 and the opposite side 5, is about 3/15 of the unit pitch P. The unit lateral grooves formed by the parts 30 become wider and wider from the tire center part toward the shoulder part 6.

Thus, if the width of the unit lateral grooves 20, 21, 22, 23 becomes wider from the center of the tire toward the width of the shoulder portion 6, the drainage performance may naturally be improved.

The present invention further extends the depth of the unit lateral grooves 20, 21, 22, and 23 provided between the rows of blocks toward the shoulder 6 from the center of the tire.

That is, the depth D1 of the groove between the first step 43 and the opposite side 5, which is the tire central part width step of the unit lateral grooves 20, 21, 22, 23, is 7 / of the main groove depth D. It is formed to a depth of 10 to 8/10, and the depth D2 of the groove between the second step 42 and the opposite side 5 is formed to be 8/10 to 9/10 of the main groove depth D.

The depth D of the groove between the third step 41 and the opposite side 5 is formed to be the same as the depth D of the main groove.

In the present invention, the width and depth of the lateral grooves are formed to be wider and deeper from the center of the tire toward the outside, so that the drainage performance is greatly improved, and the driving performance on the wet road can be improved. In proportion to the area and inversely proportional to the groove depth around the unit block, the present invention does not reduce the area of the unit block as compared with the conventional art, and the total lateral groove depth is not larger than that of the conventional groove length. Since it does not reduce the rigidity of the block, it is possible to secure good driving performance (Dry performance) on the general road.

Claims (7)

Each unit block 30 is formed of main grooves 10, 11, 12 and a plurality of lateral grooves 20, 21, 22, and 23, and travels with the front ground edge 4 of the unit block 30. Pneumatic tires, characterized in that the unit lateral grooves (20, 21, 22, 23) formed between the opposing sides (5) of the unit blocks arranged in the direction toward the shoulder portion 6 gradually formed from the center of the tire . 2. The pneumatic tire according to claim 1, wherein the depth of the unit lateral grooves (20, 21, 22, 23) is formed more and more deeply toward the shoulder (6) from the center of the tire. The line ground edges 4 of the unit transverse grooves 20, 21, 22, and 23 are formed of three stepped portions 41, 42, and 43, respectively. Pneumatic tires. The width W1, W2, W3, which is an interval between the three steps 43, 42, 41 and the opposite side 5 of the front ground edge 4, respectively, is the unit pitch of the block 30. A pneumatic tire, characterized in that formed in about 15 branches 1, 15 branches 2 and 15 branches 3 of P). The pneumatic tire according to claim 1 or 2, wherein the unit lateral grooves (20, 21, 22, 23) are formed deeper and deeper from the tire center portion toward the shoulder portion. The depth D1 of the groove between the first step 43 and the opposite side 5 of the unit lateral grooves 20, 21, 22, and 23 is 7/10 of the main groove depth D. Pneumatic tire formed by forming a depth of 2 to 8/10 and forming a depth D2 of the groove between the second step 42 and the opposite side 5 to 8/10 to 9/10 of the main groove depth D. . The depth D1 of the groove between the first step 43 and the opposite side 5 of the unit transverse grooves 20, 21, 22, 23 is 7/10 of the main groove depth D. Pneumatic tire formed by forming a depth of 8 to 8/10 and forming a depth D2 of the groove between the second step 42 and the opposite side 5 to 8/10 to 9/10 of the main groove depth D. .