KR100345745B1 - Passenger car tire tread pattern having improved hydroplanning performance on wet road - Google Patents

Abstract

The present invention is directed to a tread pattern structure of a pneumatic tire that can improve handling performance on dry and wet roads, enhance drainage on wet roads, and prevent a decrease in block stiffness of the tread pattern. Regarding the tread pattern structure in which the central block 3 and the shoulder block 4 are symmetrically arranged with respect to the central main groove 2 in the circumferential direction, the central block 3 is formed by the inclined groove 7. The central block 3 is divided by semi-grooves 8 arranged at equal intervals. In addition, the shoulder block is arranged in the transverse direction to achieve the curvature to maximize the block rigidity.

Description

Passenger car tire tread pattern having improved hydroplanning performance on wet road}

The present invention relates to a block structure of a pneumatic tire tread pattern, and in particular, to improve handling performance on dry roads and to improve drainage performance and handling performance on moist roads, and to minimize rigidity and unevenness of the pattern block. It relates to a tread pattern of pneumatic tires.

In general, the tire has a tread portion in contact with the road surface, the tread portion is in contact with the road surface while the tire is running in order to support the weight of the car, all the necessary force of the car is transmitted and acted through the tread ground.

The tread of pneumatic tires for passenger cars that play such a role is designed with a unique panel structure to satisfy both handling performance on dry roads and handling on moist roads. To ensure that the tread pattern blocks are designed to have a large stiffness, the overall tread to be grounded and grounded while increasing the block area of the tread to induce maximum friction between the tread pattern blocks in contact with the road surface. It is designed in such a way that the ground area of the wire is increased to the maximum.

In addition, the width of the shoulder block occupies about 5% of the width of the center block of the tread pattern to prevent slippage of the tire due to the stiffness of the shoulder portion holding the tread when cornering on a dry road. The pattern is designed to be about 20% to 20% to induce rigidity improvement of the shoulder part.

However, such a conventional tread pattern design can satisfy the handling performance on the dry road surface, but the problem of causing a decrease in the handling performance as well as the drainage performance on the road surface with moisture.

On the other hand, in the past, in order to improve the drainage and handling performance on the road surface with moisture as described above, a tire having a semi groove (Semi Groove) and a sipe is proposed in the tread pattern block, semi grooves formed in such a pattern block The design of the sipe (for example, position, depth, number, etc.) is an important factor in the design of the tread pattern of the tire, but the manufacturing cost of the tire vulcanization mold is long and the mold manufacturing cost is complicated. There was a back.

Accordingly, the present invention has been invented to solve the conventional problems as described above, passenger car that not only improves the handling performance in dry and wet road surface, but also reduces the production period and cost of the mold while minimizing the decrease and non-uniformity of the tread block stiffness It is an object of the present invention to provide a tread pattern block structure of a tire.

1 is a cross-sectional view of a common pneumatic tire,

2 is a partially enlarged front view illustrating a block structure of a tread pattern of a pneumatic tire according to the present invention;

3 is an enlarged front view of a portion A of FIG. 2.

-Explanation of terms for the main parts of the accompanying drawings-

1: Tread 2: Central main groove

3: center block 4: shoulder block

5: center block groove 6: shoulder block block groove

7: inclined groove 8: semi-groove

9: Shoulder tw: Width of the tread

The present invention for achieving the above object in the tread structure of the tire in which the central block and the shoulder block is symmetrically disposed on the basis of the central main groove in the circumferential direction, the shoulder of the central block groove and the shoulder block of the central block Inclined grooves are formed at equal intervals between the sub-block grooves, but semi-grooves are connected between the inclined grooves formed at equal intervals.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a general tire. In the tread 1, a central main groove 2 is formed at the center along the circumferential direction of the tire, and the central block 3 is formed on the center main groove 2. The shoulder block 4 is arranged in a symmetrical structure.

2 is a partially enlarged front view of a tire showing a threaded pattern block structure of a pneumatic tire according to the present invention. As shown in the drawing, the center block 3 and the shoulder part based on the center main groove 2 in the circumferential direction are shown. In the tread structure in which the blocks 4 are symmetrically arranged, an inclined groove 7 is provided between the central block groove 5 of the central block 3 and the shoulder block block groove 6 of the shoulder block 4. It is formed at intervals, the semi-groove (8) is connected between the inclined groove (7) arranged at equal intervals.

The width X forming the central block 3 is about 10% to 20% greater than the width Y forming the shoulder subblock 4 which meets at the end of the width TW of the tread 1. By setting it large, it prevents the central part from turning off in the ground shape of the tire and minimizes the water film phenomenon between the tire and the road surface on the wet road surface.

In addition, since the width (Y) portion forming the shoulder block 4 is formed relatively smaller than the width (X) forming the central block 3, to compensate for the degradation of the rigidity of the shoulder (9) portion The inner radius Ra and the outer radius Rb of the semi groove 8 of the shoulder part block 6 are designed to be as small as about R20 to R40. Where R stands for Radius, the unit of which is mm, as is commonly used.

As such, the radiuses Ra and Rb of the semigroove 6 are curved to increase the area of the shoulder block, thereby maintaining its rigidity.

Meanwhile, the width 8 of the central main groove 2 is formed at about 6 to 8% of the width TW of the tread 1 to enhance drainage performance on the moist road surface, and furthermore, the central block groove. Set the angle d of the inclined groove 7 that meets (5) and the angle P of the semi groove 8 that meets the inclined groove 7 to about 20 ° to 40 ° with respect to the circumferential direction of the tire, The radius Rc of the inclined groove 7 is designed to be about R300 to R1000 to smoothly induce drainage between the tire and the road surface during high-speed driving on wet roads, thereby preventing water film phenomenon and ultimately improving drainage performance. It is supposed to be.

In addition, the central block 3 of the tread is formed of a substantially rhombic or diamond-shaped block due to the semigroove 8 connecting between the inclined grooves 7 formed in the central block 3. It is possible to prevent the degradation of rigidity.

The tread pattern structure of the pneumatic tire for a passenger car according to the present invention designed as described above can obtain the following advantages.

① It satisfies drainage performance on wet roads while maintaining handling performance on dry roads.

② Uniform grounding while preventing the tread's central part from turning off by designing the width (X) of the central block (3) about 10 to 20% larger than the width (Y) of the shoulder block (4). This ensures improved handling performance on dry or wet roads.

③ By reducing the size of the sipe, it is possible to shorten the production period of the tire mold and to reduce the required cost.

Claims (6)

In the tread structure in which the central block 3 and the shoulder block 4 are symmetrically disposed with respect to the circumferential center main groove 2, Inclined grooves 7 are formed at equal intervals between the central block grooves 5 of the central block 3 and the shoulder block grooves 6 of the shoulder block blocks 4, and the grooves are disposed at equal intervals. The tread pattern of the tire for passenger cars which improved the performance on the wet road surface characterized by the semigroove 8 connected between (7). 2. The width (X) of claim 1, wherein the width (X) forming the central block (3) is 10% greater than the width (Y) forming the shoulder subblock (4) which meets at the end of the width (TW) of the tread (1). The tread pattern of a tire for a passenger car, which has improved performance on a wet road surface, characterized by being set to 20% larger. The wet road surface according to claim 1, wherein a value of an inner radius Ra and an outer radius Rb of the semi groove 8 of the shoulder part block 6 is designed to be less than R20 to R40. Tread pattern for passenger car tires with improved performance. 2. The passenger car according to claim 1, wherein the width 8 of the central main groove 2 is formed at 6 to 8% of the width TW of the tread 1. Tread pattern of tires. 2. The angle (d) of the inclined groove (7) which meets the center block groove (5) and the angle (P) of the semi groove (8) which meets the inclined groove (7) in the circumferential direction of the tire. The tread pattern of the tire for passenger cars which improved the performance on the wet road surface characterized by setting to 20 degrees-40 degrees with respect to. The tread pattern of a tire for a passenger car according to claim 1, wherein the radius Rc of the inclined groove is designed to be R300 to R1000.