TWI771029B - Tire with improved handling stability - Google Patents

Abstract

The present invention relates to a tire with improved handling stability. The tire includes a tire body and a plurality of main groove units. The tire body is provided with a tread portion, at the center of which a tread central line is defined. The tread portion is widthwise divided into two parts which are a first tread and a second tread. The main groove units are sequentially arranged on the tread portion by taking the tread central line as a reference line, wherein each of the main groove units extends in a width direction. Each of the main groove units includes a first main groove and a second main groove, wherein the first main groove includes a first, second, and third groove sections which are connected together; the second main groove includes a fourth, fifth, and sixth groove sections which are connected together. The distances and included angles between those groove sections are various, thereby improving the traction stability of the tire.

Description

Tires that improve handling and stability

The present invention relates to a tire tread structure that can improve traction stability and have continuous directionality.

The tires currently used in vehicles, in order to adapt the tires to wet and slippery roads, are attached to the tread of the tires with a tread structure formed. The tread structure is formed by a plurality of grooves of different lengths, widths and depths. Utilize tread construction to assist drainage to increase handling stability while driving. As for the groove shape, size, number, distribution position, etc. of the tread structure to provide a better design, so that the tire can take into account different performances such as grip, drainage, orientation, comfort, etc. direction.

For example, the patent case of Invention No. CN111201147 "Tyres for Motorcycles" disclosed in Mainland China on May 26, 2020 discloses: a tire that further improves the wet grip during cornering while ensuring the rigidity during cornering Motorcycle tires. The tread portion is formed by the central rubber and the rubber on both sides with lower tensile stress. The rubber on both sides extends to a position from 1/4 to 1/2 of the half-width of the outer edge length from the tire equator. 1st groove, 2nd groove, 3rd groove, 1st curved part of 1st groove, 2nd curved part, 3rd curved part, 2nd groove width direction inner end part, 3rd groove width direction inner end part and The outer ends in the width direction are respectively 1/2~5/8, 1/16~3/16, 3/16~5/16, 1/2~3/4, 1/16~3/16, 5/8~7/8 range, 1st groove part, 2nd groove part, 3rd groove part, 4th groove part, 2nd groove part, 5th groove part, 6th groove part The angles formed by the part relative to the circumferential direction are 35°~45°, 55°~65°, 20°~30°, 55°~65°, 55°~65°, 55°~65°, 15°~25° °.

Although the previous case of the patent can improve part of the handling stability, the groove in the middle area of the main groove is deviated from the center, resulting in poor traction stability and cannot effectively improve the handling stability in an all-round way. ideal.

In view of this, the conventional tire structure has the above-mentioned disadvantages. Therefore, the present invention provides a tire with improved handling stability, comprising: a tire body, a tread portion is fastened on the circumference thereof, and two sides of the tread portion are respectively set as a first side edge and a second side edge, the The center of the tread portion defines a tread centerline, which divides the tread portion into a first tread and a second tread in a width direction; a plurality of main groove units are connected to the tread The center line is used as a reference, the main groove units of each group are arranged on the tread portion in a continuous arrangement in the width direction, and the main groove units of each group are formed on the tread portion with a pitch , and the sea ratio of the main groove unit in each of the pitches is between 13.6% and 23.4%, and accounts for between 4.3% and 7.4% of the total area of the tread; each group of the main groove units It includes a first main groove and a second main groove. The first main groove and the second main groove span the area of 10% to 90% of the tread portion in the width direction. The main groove is provided with a first groove section, a second groove section and a third groove section connected, and the first groove section, the second groove section and the third groove section of the main groove unit of different groups is continuously located on the first tread or the second tread, a first angle between the first groove segment and the second groove segment is between 60° and 95°, and the second groove segment is between 60° and 95°. The main groove is provided with a fourth groove section, a fifth groove section and a sixth groove section, and the fourth groove section, the fifth groove section and the sixth groove section of the main groove unit of different groups It is continuously located on the first tread or the second tread, the second main groove is provided with a disconnection part at the middle section, and a fifth groove between the fourth groove section and the fifth groove section The included angle is between 60° and 95°.

A second included angle between a first centerline of the first groove segment and the tread centerline, a third included angle between a second centerline of the second groove segment and the tread centerline, and A fourth included angle between a third centerline of the third groove segment and the tread centerline is between 20° and 70°, respectively. A sixth angle between a fourth centerline of a segment and the tread centerline, a seventh angle between a fifth centerline of the fifth groove segment and the tread centerline, and the sixth groove An eighth included angle between the sixth centerline of the segment and the tread centerline is between 20° and 70°, respectively.

One end of the first groove section facing the first side or the second side is set as a first gradually expanding portion, and one end of the third groove section facing the second side or the first side is It is set as a second gradually expanding portion.

A first distance between the first centerline of the first groove section and the fourth centerline of the fourth groove section is between 40mm and 80mm, and the third centerline of the third groove section is between 40mm and 80mm. A second distance between the line and the sixth centerline of the sixth groove segment is between 40mm and 80mm.

The above-mentioned are further provided with a plurality of groups of auxiliary groove units, which are based on the center line of the tread and are arranged on the tread portion in a continuous arrangement in the width direction, and each group of the auxiliary groove units is arranged in parallel on any Between two groups of adjacent main trench units, the sub trench unit includes at least a first sub trench, a first sub trench centerline of the first sub trench, and a group of adjacent first main trench units. A third distance between the first centerline of the first groove segment of the groove is between 40mm and 80mm, and the centerline of the first auxiliary groove of the first auxiliary groove is adjacent to another group A fourth distance between the sixth centerlines of the sixth groove segment of the second main groove is between 60mm and 90mm.

The above-mentioned auxiliary groove unit further includes at least one second auxiliary groove, and a fifth distance between a second auxiliary groove centerline of the second auxiliary groove and the first auxiliary groove centerline of the first auxiliary groove is between Between 30mm and 40mm, a sixth distance between the centerline of the second auxiliary groove of the second auxiliary groove and the first centerline of the first groove segment of the first main groove adjacent to a group of them It is between 60mm and 80mm, and between the centerline of the second auxiliary groove of the second auxiliary groove and the sixth centerline of the sixth groove segment of the second main groove of another group of adjacent groups A seventh distance is between 40mm and 60mm.

The above-mentioned tread portion is formed with 6 to 8 such pitches.

The sea ratio of the main trench unit within each pitch is one of the following: 14.2% to 20%, 15.4% to 23%, 13.6% to 19.8%, 15.5% to 23.4%.

The total area of the tread portion occupied by the main groove units in each pitch is one of the following: 4.5% to 6.3%, 4.9% to 7.3%, 4.3% to 6.3%, 4.9% to 7.4%.

The above technical features have the following advantages:

1. The tire pattern formed by the first main groove and the second main groove can have a higher sea ratio design on the tread portion, thereby improving the wet grip performance of the tire.

2. The first groove section, the third groove section of the first main groove, the fourth groove section and the sixth groove section of the second main groove, and the tire pattern formed by the first auxiliary groove and the second auxiliary groove can be used. The position on the tread portion close to the first side edge and the second side edge can be designed with a lower sea ratio, so as to have both road and uneven road grip and traction.

3. The first main groove and the second main groove of the main groove unit span a large area of 10% to 90% of the tread portion, thereby improving the handling stability of the tire.

4. The two ends of the first main groove are respectively provided with a first gradually expanding part and a second gradually expanding part, which can improve the drainage, guidance and grip of the tire.

1: Tire body

11: Tread part

12: First side

13: Second side

14: Tread centerline

15: First tread

16: Second tread

2: The first main groove

3: The second main groove

21: The first groove section

211: First midline

22: Second groove section

221: Second midline

23: The third groove

231: The third midline

24: The first gradual expansion

25: Second Gradient

3: The second main groove

31: Fourth groove section

311: Fourth Midline

32: Fifth groove section

321: Fifth Midline

33: The sixth groove

331: Sixth Midline

34: Disconnection

4: The first sub-ditch

41: The middle line of the first auxiliary groove

5: The second sub-ditch

51: Middle line of the second sub-ditch

6: fine lines

A1: The first included angle

A2: Second included angle

A3: The third included angle

A4: Fourth included angle

A5: Fifth included angle

A6: The sixth angle

A7: The seventh angle

A8: Eighth included angle

B1: first distance

B2: Second distance

B3: The third distance

B4: Fourth distance

B5: Fifth distance

B6: sixth distance

B7: Seventh distance

X: width direction

[Figure 1] is a three-dimensional appearance view of an embodiment of the present invention.

[The second figure] is a front view of the embodiment of the present invention.

[The third picture] is a partial plan view of the 110/80R19 tire (front wheel) of the embodiment of the present invention.

[Fourth picture] is a partial plan view of the 110/80R19 tire (front wheel) of the embodiment of the present invention showing different distances.

[Figure 5] is a partial plan view of the 120/70R19 tire (front wheel) of the embodiment of the present invention.

[Picture 6] is a partial plan view showing different distances of the 120/70R19 tire (front wheel) of the embodiment of the present invention.

[Figure 7] is a partial plan view of the 170/60R17 tire (rear wheel) of the embodiment of the present invention.

[Figure 8] is a partial plan view showing different distances of the 170/60R17 tire (rear wheel) of the embodiment of the present invention.

[Figure 9] is a simple schematic diagram showing different angles of the 110/80R19 tire (front wheel) of the embodiment of the present invention.

[Picture 10] is a simple schematic diagram showing different included angles of the 120/70R19 tire (front wheel) of the embodiment of the present invention.

[Figure 11] is a simple schematic diagram showing different angles of the 170/60R17 tire (rear wheel) of the embodiment of the present invention.

Referring to the first and second figures, the embodiment of the present invention includes: a tire body 1, a main groove unit including a first main groove 2 and a second main groove 3, and a secondary groove unit including a first auxiliary groove 4 and The second sub-groove 5, the fine line 6, wherein:

The tire body 1 is provided with a tread portion 11 on its circumference, and two sides of the tread portion 11 are respectively set as a first side edge 12 and a second side edge 13 . The center of the tread portion 1 defines a tread centerline 14 , which divides the tread portion 11 into a first tread 15 and a second tread 16 in a width direction X.

A plurality of groups of main groove units, as shown in the third figure, are based on the tread centerline 14, and the main groove units of each group are arranged in a continuous arrangement on the tread portion in the width direction X 11, which can effectively improve the traction stability of the tire and improve the tread rigidity during driving. Each group of the main groove units includes a first main groove 2 and a second main groove 3 . In the width direction X, the first main groove 2 and the second main groove 3 span an area of 10% to 90% of the tread portion 11 .

The main groove units of each group are formed with a pitch on the tread portion 11 , and 6 to 8 pitches can be formed on the tread portion 11 . The number of this pitch is different for different specifications of tires, for example For example, 110/80R19 tires (front wheel) have 8 of these pitches. 150/70R17 tires (rear) have 6 of this pitch. 120/70R19 tires (front) have 8 of this pitch. 170/60R17 tires (rear) have 8 of this pitch.

The sea ratio of the main groove unit in each of the pitches is between 13.6% and 23.4%, and accounts for between 4.3% and 7.4% of the total area of the tread portion 11 . The ratio of tires of different specifications is different. For example, the sea ratio of the main groove unit within each pitch of 110/80R19 tires (front wheel) is between 14.2% and 20%, and accounts for the total 11% of the tread portion. Between 4.5% and 6.3% of the area. The sea ratio of the main groove unit in each of the pitches of the 150/70R17 tire (rear wheel) is between 15.4% and 23%, and accounts for between 4.9% and 7.3% of the total area of the tread portion 11. . The sea ratio of the main groove unit in each of the pitches of the 120/70R19 tire (front wheel) is between 13.6% and 19.8%, and accounts for between 4.3% and 6.3% of the total area of the tread portion 11 . The sea ratio of the main groove unit in each of the pitches of the 170/60R17 tire (rear wheel) is between 15.5% and 23.4%, and accounts for between 4.9% and 7.4% of the total area of the tread portion 11. .

As shown in the second and third figures, the first main groove 2 is provided with a first groove section 21 , a second groove section 22 and a third groove section 23 connected in accordance with each other. The first groove section One end of 21 facing the first side 12 [or the second side 13] is set as a first gradually expanding portion 24, and the third groove segment 23 is facing the second side 13 [or the first side One end of the side 12 ] is set as a second gradually expanding portion 25 . The first groove section 21 , the second groove section 22 and the third groove section 23 of the main groove units of different groups are continuously located on the first tread 15 or the second tread 16 .

A first angle A1 between the first groove section 21 and the second groove section 22 is between 60° and 95°. The first included angle A1 of different specifications of tires is different. For example, the first included angle A1 of a 110/80R19 tire (front wheel) is 82° (as shown in the third and fourth figures). The first included angle A1 of the 150/70R17 tire (rear wheel) is 85.5°. The first included angle A1 of the 120/70R19 tire (front wheel) is 86° (as shown in Figures 5 and 6). The first included angle A1 of the 170/60R17 tire (rear wheel) is 91.5° (as shown in Figures 7 and 8).

As shown in Figure 9, a second angle A2 between a first center line 211 of the first groove segment 21 and the tread center line 14, a second center line 221 of the second groove segment 22 and A third included angle A3 between the tread centerline 14 and a fourth included angle A4 between a third centerline 231 of the third groove segment 23 and the tread centerline 14 are respectively between 20° to between 70°. The second included angle A2, the third included angle A3 and the fourth included angle A4 are different for tires of different specifications. For example, the second included angle A2 of a 110/80R19 tire (front wheel) is 55.7°; the third included angle A3 is is 27.5°; the fourth included angle A4 is 50.6° (as shown in the ninth figure). The second included angle A2 of the 150/70R17 tire (rear wheel) is 61.8°; the third included angle A3 is 27°; and the fourth included angle A4 is 57.9°. The second included angle A2 of the 120/70R19 tire (front wheel) is 56.8°; the third included angle A3 is 29.5° (as shown in Figure 10); the fourth included angle A4 is 51.8°. The second included angle A2 of the 170/60R17 tire (rear wheel) is 64.2°; the third included angle A3 is 34°; the fourth included angle A4 is 62.4° (as shown in Figure 11).

As shown in the second and third figures, the second main groove 3 is provided with a fourth groove section 31 , a fifth groove section 32 and a sixth groove section 33 which are connected accordingly. The fourth groove segment 31 , the fifth groove segment 32 and the sixth groove segment 33 of the main groove units of different groups are continuously located on the first tread 15 or the second tread 16 . About 2/3 of the middle section of the second main groove 3 is provided with a disconnection portion 34 .

A fifth included angle A5 between the fourth groove section 31 and the fifth groove section 32 is between 60° and 95°. The included angle of different specifications of tires is different, for example, the fifth included angle A5 of 110/80R19 tire (front wheel) is 81° (as shown in the third and fourth pictures). The fifth included angle A5 of the 150/70R17 tire (rear wheel) is 80°. The fifth included angle A5 of the 120/70R19 tire (front wheel) is 85° (as shown in Figures 5 and 6). The fifth included angle A5 of the 170/60R17 tire (rear wheel) is 85.5° (as shown in Figures 7 and 8).

As shown in Figure 9, a sixth angle A6 between a fourth center line 311 of the fourth groove segment 31 and the tread center line 14, a fifth center line 321 of the fifth groove segment 32 and A seventh included angle A7 between the tread centerline 14 and an eighth included angle A8 between a sixth centerline 331 of the sixth groove segment 33 and the tread centerline 14 are respectively between 20° to between 70°. The sixth included angle A6 and the seventh included angle of tires of different specifications A7 and the eighth included angle A8 are different respectively. For example, the sixth included angle A6 of 110/80R19 tires (front wheel) is 57.2°; the seventh included angle A7 is 25.4°; the eighth included angle A8 is 53.5° [ As shown in Figure 9]. The sixth included angle A6 of the 150/70R17 tire (rear wheel) is 57.1°; the seventh included angle A7 is 22.3°; the eighth included angle A8 is 58.4°. The sixth included angle A6 of the 120/70R19 tire (front wheel) is 58.9°; the seventh included angle A7 is 28.3°; the eighth included angle A8 is 55.0° (as shown in Figure 10). The sixth included angle A6 of the 170/60R17 tire (rear wheel) is 57.1°; the seventh included angle A7 is 22.3°; the eighth included angle A8 is 58.4° (as shown in Figure 11).

As shown in the third and fourth figures, a first distance B1 between the first center line 211 of the first groove segment 21 and the fourth center line 311 of the fourth groove segment 31 is between Between 40mm and 80mm. The first distance B1 of different specifications of tires is different. For example, the first distance B1 of a 110/80R19 tire (front wheel) is 47.1 mm (as shown in the third and fourth figures). The first distance B1 of the 150/70R17 tire (rear wheel) is 52.2 mm. The first distance B1 of the 120/70R19 tire (front wheel) is 47.3mm (as shown in Figures 5 and 6). The first distance B1 of the 170/60R17 tire (rear wheel) is 52.1 mm (as shown in Figures 7 and 8).

Furthermore, a second distance B2 between the third center line 231 of the third groove segment 23 and the sixth center line 331 of the sixth groove segment 33 is between 40 mm and 80 mm. The second distance B2 of different specifications of tires is different. For example, the second distance B2 of a 110/80R19 tire (front wheel) is 45.4mm (as shown in the third and fourth pictures). The second distance B2 of the 150/70R17 tire (rear wheel) is 78.5mm. The second distance B2 of the 120/70R19 tire (front wheel) is 45.8mm (as shown in Figures 5 and 6). The second distance B2 of the 170/60R17 tire (rear wheel) is 78.6 mm (as shown in the seventh and eighth pictures).

A plurality of sub-groove units are arranged on the tread portion 11 in a continuous arrangement in the width direction X with the tread centerline 14 as a reference, so as to effectively improve the traction stability of the tire and improve the driving performance. Tread rigidity in . As shown in the third and fourth figures, each group of the secondary groove units is arranged in parallel between any two adjacent groups of the main groove units. The sub-groove unit includes at least a first sub-groove 4, the first sub-groove 4 A third distance B3 between a first secondary groove centerline 41 of a secondary groove 4 and the first centerline 211 of the first groove segment 21 of a group of adjacent first main grooves 2 is Between 40mm and 80mm. The third distance B3 of different specifications of tires is different, for example, the third distance B3 of 110/80R19 tires (front wheel) is 43.6mm (as shown in the third and fourth pictures). The third distance B3 of the 150/70R17 tire (rear wheel) is 75.5mm. The third distance B3 of the 120/70R19 tire (front wheel) is 41.6mm (as shown in Figures 5 and 6). The third distance B3 of the 170/60R17 tire (rear wheel) is 74.5mm (as shown in the seventh and eighth pictures).

Also, a fourth centerline 41 between the first auxiliary groove centerline 41 of the first auxiliary groove 4 and the sixth centerline 331 of the sixth groove segment 33 of the second main groove 3 adjacent to another group. The distance from the B4 series is between 60mm and 90mm. The fourth distance B4 of different specifications of tires is different. For example, the fourth distance B4 of a 110/80R19 tire (front wheel) is 86.8mm (as shown in the third and fourth pictures). The fourth distance B4 of the 150/70R17 tire (rear wheel) is 70mm. The fourth distance B4 of the 120/70R19 tire (front wheel) is 85.7mm (as shown in Figures 5 and 6). The fourth distance B4 of the 170/60R17 tire (rear wheel) is 68.9mm (as shown in the seventh and eighth pictures).

The sub-groove unit further includes at least one second sub-groove 5 , a first sub-groove center line 51 of the second sub-groove 5 and the first sub-groove center line 41 of the first sub-groove 4 The five-distance B5 series is between 30mm and 40mm. The fifth distance B5 of tires of different specifications is different, for example, the fifth distance B5 of 110/80R19 tires (front wheel) is 34.7mm (as shown in the third and fourth pictures). The fifth distance B5 of the 120/70R19 tire (front wheel) is 35mm (as shown in the fifth and sixth pictures).

A sixth distance between the second sub-groove centerline 51 of the second sub-groove 5 and the first centerline 211 of the first groove segment 21 of a group of adjacent first main grooves 2 The B6 series is between 60mm and 80mm. The sixth distance B6 of different specifications of tires is different. For example, the sixth distance B6 of a 110/80R19 tire (front wheel) is 78.3mm (as shown in the third and fourth pictures). The sixth distance B6 of the 120/70R19 tire (front wheel) is 76.6mm (as shown in Figures 5 and 6).

Also, a seventh line between the center line 51 of the second auxiliary groove of the second auxiliary groove 5 and the sixth center line 331 of the sixth groove segment 33 of the second main groove 3 adjacent to another group. The distance B7 is between 40mm and 60mm (as shown in the third and fourth pictures). The seventh distance B7 of tires with different specifications is different, for example, the seventh distance B7 of 110/80R19 tires (front wheel) is 52.1 mm. The seventh distance B7 of the 120/70R19 tire (front wheel) is 50.7mm (as shown in Figures 5 and 6).

The plurality of fine lines 6 are provided on the tread portion 11 in a continuous arrangement in the width direction X with the tread centerline 14 as a reference. The fine lines 6 are regularly connected between the first main groove 2 and the second main groove 3 of the main groove units and between the first sub grooves 4 and the second sub grooves of the sub groove units Between the grooves 5, the drainage performance of the tread portion 11 can be increased.

In this way, with the tire pattern formed by the first main groove 2 and the second main groove 3, the tread portion 11 can be designed with a higher sea ratio to improve the wet grip performance of the tread portion 11 . The first groove section 21, the third groove section 23 of the first main groove 2 and the fourth groove section 31 and the sixth groove section 33 of the second main groove 3 are matched with the first auxiliary groove. 4. The tire pattern formed by the second auxiliary groove 5 can be designed with a lower sea ratio on the tread portion 11 at the position close to the first side edge 12 and the second side edge 13. It has both road and uneven road grip and traction. In addition, the first main groove 2 and the second main groove 3 of the main groove unit span a large area of 10% to 90% of the tread portion 11 , thereby improving tire tracking. In addition, the two ends of the first main groove 2 are respectively provided with the first gradually expanding portion 24 and the second expanding portion 25, which are gradually widened, so as to improve the drainage and sand-removing properties of the tire.

Based on the descriptions of the above embodiments, one can fully understand the operation, use and effects of the present invention, but the above-mentioned embodiments are only preferred embodiments of the present invention, which should not limit the implementation of the present invention. Scope, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, all fall within the scope of the present invention.

1: Tire body

11: Tread part

12: First side

13: Second side

14: Tread centerline

15: First tread

16: Second tread

2: The first main groove

3: The second main groove

4: The first sub-ditch

5: The second sub-ditch

6: fine lines

X: width direction

Claims (9)

A tire for improving handling stability, comprising: a tire body, a tread portion is fastened on its circumference, two sides of the tread portion are respectively set as a first side edge and a second side edge, and the tread portion is A tread centerline is defined in the center, and the tread centerline divides the tread portion into a first tread and a second tread in a width direction; a plurality of groups of main groove units are used as the tread centerline. Reference, the main groove units of each group are arranged on the tread portion in a continuous arrangement in the width direction, the main groove units of each group are connected to the tread portion to form a pitch, and each The sea ratio of the main groove units within the pitch ranges from 13.6% to 23.4%, and accounts for 4.3% to 7.4% of the total area of the tread portion; each group of the main groove units includes a first A main groove and a second main groove, the first main groove and the second main groove are in the width direction, spanning 10% to 90% of the area of the tread portion, the first main groove is provided There are connected a first groove section, a second groove section and a third groove section, and the first groove section, the second groove section and the third groove section of the main groove unit of different groups are continuous On the first tread or the second tread, a first angle between the first groove segment and the second groove segment is between 60° and 95°, and the second main groove is set There are connected a fourth groove section, a fifth groove section and a sixth groove section, and the fourth groove section, the fifth groove section and the sixth groove section of the main groove unit of different groups are continuous Located on the first tread or the second tread, the second main groove is provided with a disconnecting portion at the middle section, and a fifth included angle between the fourth groove section and the fifth groove section is between Between 60° and 95°; a plurality of fine lines, based on the tread centerline, are arranged on the tread portion in a continuous arrangement in the width direction, and these fine lines are regularly connected to the tread between the first main trench and the second main trench of the equal main trench unit. The tire with improved steering stability as claimed in claim 1, wherein a second included angle between a first centerline of the first groove segment and the tread centerline, a second centerline of the second groove segment with the A third included angle between tread centerlines and a fourth included angle between a third centerline of the third groove segment and the tread centerline are respectively between 20° and 70°. A sixth included angle between a fourth centerline of one of the four groove segments and the tread centerline, a seventh included angle between a fifth centerline of the fifth groove segment and the tread centerline, and the An eighth included angle between the sixth center line of the six-groove section and the tread center line is between 20° and 70°, respectively. The tire with improved steering stability according to claim 2, wherein one end of the first groove section facing the first side or the second side is set as a first tapered portion, and the third groove section is facing One end of the second side or the first side is configured as a second gradually expanding portion. The tire for improving steering stability according to claim 2, wherein a first distance between the first centerline of the first groove segment and the fourth centerline of the fourth groove segment is between 40mm and 80mm and a second distance between the third centerline of the third groove segment and the sixth centerline of the sixth groove segment is between 40 mm and 80 mm. As claimed in claim 1, the tire with improved steering stability is further provided with a plurality of sub-groove units, which are arranged on the tread portion in a continuous arrangement in the width direction with the tread centerline as a reference. A group of the auxiliary groove units are arranged in parallel between any two groups of adjacent main groove units, the auxiliary groove units at least include a first auxiliary groove, a first auxiliary groove centerline of the first auxiliary groove, A third distance between the first centerline of the first groove segment of the first main groove adjacent to one group is between 40mm and 80mm, and the first auxiliary groove of the first auxiliary groove A fourth distance between the center line of the secondary groove and the sixth center line of the sixth groove segment of the other adjacent second main groove is between 60 mm and 90 mm. The tire with improved steering stability according to claim 5, wherein the auxiliary groove unit further comprises at least one second auxiliary groove, a second auxiliary groove centerline of the second auxiliary groove and the first auxiliary groove of the first auxiliary groove A fifth distance between the centerlines of the secondary grooves is between 30mm and 40mm, the centerlines of the second secondary grooves of the second secondary grooves and the first grooves of a group of adjacent first main grooves A sixth distance between the first centerline of the segment is between 60mm and 80mm, and the centerline of the second auxiliary groove of the second auxiliary groove and the other A seventh distance between the sixth centerlines of the sixth groove segments of the adjacent second main grooves is between 40 mm and 60 mm. The tire with improved steering stability according to claim 1, wherein 6 to 8 pitches are formed on the tread portion. The tire with improved handling stability according to claim 1, wherein the sea-to-sea ratio of the main groove unit in each of the pitches is one of the following: 14.2% to 20%, 15.4% to 23%, 13.6% to 13.6% 19.8%, 15.5% to 23.4%. The tire with improved steering stability according to claim 1, wherein the total area of the tread portion occupied by the main groove unit in each of the pitches is one of the following: 4.5% to 6.3%, 4.9% to 7.3% %, 4.3% to 6.3%, 4.9% to 7.4%.

Images