All-weather passenger car radial tire

Abstract

The present application belongs to the field of radial tire. In order to solve the problem of relatively insufficient performance of traditional all-weather tire on ice and snow and in dry and wet land, the present application provides a strong grip all-weather radial tire for passenger car. Four unequal-width straight longitudinal grooves are distributed on the tread, and between the straight longitudinal grooves are pattern block A, pattern block B and pattern block C. Form I transverse groove is distributed on the pattern block A. Form II transverse groove is distributed on the pattern block B and the pattern block C, and the form II transverse groove on the two pattern blocks are 180° mirror images and are connected by 30°-38° diagonal lines. The form I transverse groove on the pattern block A is connected by 60°-70° diagonal lines with the form II transverse groove on the pattern block B. Form a, form b and form c small three-dimensional sipes are respectively distributed on the pattern block A, the pattern block B and the pattern block C. Form a small three-dimensional sipe is trapezoidal zigzag sipe, and form c small sipe is arc-shaped groove. The present application effectively improves the grip on ice and snow and in dry and wet land by the design of strong grip special area.

Description

Technical Field

[0001] This invention belongs to the field of radial tires, specifically relating to high-grip all-weather passenger car radial tires. Background Technology

[0002] All-weather tires, also known as four-season tires or all-road tires, must possess a certain level of grip on icy and snowy roads in winter and a certain level of grip on both dry and wet surfaces in summer to be suitable for various seasons, climates, and road conditions. However, current all-weather tires do not offer the same grip on icy and snowy roads as winter tires, nor the same grip on dry and wet surfaces as summer tires, failing to meet consumer performance requirements. Current efforts primarily focus on improving the tread compound, but because ice and snow performance and wet performance are inherently contradictory in the compound design, the results are not ideal. Some have attempted to improve the tire tread structure by dividing the tire surface pattern into dry and wet tread blocks, with the two types of blocks interspersed laterally and longitudinally. Since the grip performance of all-weather tires needs to consider performance on three different road surfaces—dry, wet, and snow—and the tread pattern design for these three surfaces is contradictory, coordinating grip performance across these three types to improve overall grip is a significant challenge in tire design. Existing solutions that improve tire tread structure are not very effective, and there is still room for improvement in the dry, wet, and snow braking performance of tires. Therefore, how to enable all-weather tires to simultaneously meet the levels of winter and summer tires in terms of ice and snow grip and dry and wet grip remains an urgent industry challenge. Summary of the Invention

[0003] To address the aforementioned issues of insufficient performance of traditional all-weather tires in ice, snow, and both dry and wet conditions, this invention provides a high-grip all-weather passenger car radial tire that effectively enhances grip in both ice, snow, and dry / wet conditions through a special high-grip design.

[0004] This invention is achieved through the following technical solution:

[0005] A high-grip all-weather passenger car radial tire has four longitudinal grooves of unequal width distributed on its tread. From the inside to the outside of the tire, these are the first, second, third, and fourth longitudinal grooves. The tire's centerline lies between the second and third longitudinal grooves. Tread blocks A are distributed between the first and second longitudinal grooves, tread blocks B are distributed between the second and third longitudinal grooves, and tread blocks C are distributed between the third and fourth longitudinal grooves. The circumferential area encompassed by the inner edges of the first and fourth longitudinal grooves constitutes the high-grip zone, with the tire's centerline as the dividing line. The width of the high-grip zone is 50-60% of the tread width. Tread blocks A, B, and C are of equal width. The second and third longitudinal grooves are of equal width.

[0006] Pattern block A has horizontal grooves of type I distributed on it, with an angle of 55°-62° to the first vertical groove and an angle α2 of 82°-88° to the second vertical groove. Pattern blocks B and C have horizontal grooves of type II distributed on them. The horizontal groove of type II on pattern block B has an angle of 94°-100° to the vertical direction, and the horizontal groove of type II on pattern block C has an angle of 94°-100° to the second vertical groove. The horizontal grooves of type II on the two types of pattern blocks are 180° mirror images of each other and are joined by a 30°-38° oblique line. The horizontal groove of type I on pattern block A and the horizontal groove of type II on pattern block B are joined by a 60°-70° oblique line.

[0007] Type I horizontal groove adopts a continuous design. 3 / 4 of the pattern depth is Type I composite groove. Type I composite groove is composed of equal-width large groove and three-dimensional fine knife groove. The three-dimensional fine knife groove is interrupted at 1 / 2 of the length of its horizontal groove.

[0008] Form II horizontal groove adopts a non-through design, and is sealed at 1 / 3 of the length of pattern block B. 3 / 4 of the pattern depth is Form II composite groove. Form II composite groove consists of widened large groove and three-dimensional fine knife groove. The three-dimensional fine knife groove is broken at 1 / 3 of the length of its horizontal groove and at the end.

[0009] The tire adopts a variable pitch tread pattern design, with five different pitches ranging from small to large.

[0010] Patterned blocks A, B, and C are respectively equipped with small three-dimensional grooves of form a, form b, and form c. The small groove of form a is a trapezoidal zigzag groove with a three-fold three-dimensional structure; the small groove of form b is a straight groove; and the small groove of form c is an arc groove with a three-fold three-dimensional structure.

[0011] Furthermore, taking the centerline of the tire as the dividing line, the inner width of the strong grip special zone is 28% of the driving surface width, the outer width of the strong grip special zone is 28% of the driving surface width, the widths of tread blocks A, B, and C are equal, each being 14% of the driving surface width; the widths of the second and third longitudinal grooves are equal, each being 7% of the driving surface width.

[0012] Furthermore, pattern block A has a horizontal groove of type I distributed at an angle of 59° to the vertical direction. Pattern blocks B and C have horizontal grooves of type II distributed at an angle of 97° to the vertical direction. The horizontal groove of type II on pattern block B also has an angle of 97° to the vertical direction. Moreover, the horizontal grooves of type II on the two types of pattern blocks are 180° mirror images of each other and are joined by a 34° oblique line. The horizontal groove of type I on pattern block A and the horizontal groove of type II on pattern block B are joined by a 65° oblique line.

[0013] Furthermore, in Form I composite grooves, half of the full depth H is a large groove of equal width, while the remainder is a three-dimensional fine groove.

[0014] Furthermore, in Form II transverse grooves, half of the full depth H of the Form II composite groove is a widened large groove, and the remainder is a three-dimensional fine slit.

[0015] Furthermore, the three-dimensional fine grooves have radii of curvature R of 0.5mm, 0.3mm, 0.3mm and 0.5mm respectively on the center line of the cross section in the direction perpendicular to the tire tread, so that adjacent tread blocks can interlock with each other when they touch the ground.

[0016] Furthermore, in form a, 2 / 3 of the depth of the small sipe is a groove of equal width, and in form c, 2 / 3 of the depth of the small sipe 14 is also a groove of equal width. This part adopts a three-dimensional structure with a 3-fold fold. The center line of the cross section in the direction perpendicular to the tire tread is a folded line. The initial line segment of the center line is 0.3mm long, followed by four straight line segments, which are transitioned by arcs with curvature radii R of 0.5mm, 0.3mm, 0.5mm, and 0.3mm, with different concave directions of the curvature circles, and finally connected to a line segment with a length of 0.3mm.

[0017] Furthermore, the type a fine cutting groove is divided into 3 equally spaced grooves at the maximum pitch and 2 equally spaced grooves at the remaining pitches; the type b fine cutting groove is distributed in two grooves at each pitch, with the first groove located at the 5th division of the pitch and the second groove located at the 10th division, and the grooves break when they encounter the type II transverse groove; the type c fine cutting groove is distributed in two equally spaced grooves within each pitch.

[0018] Furthermore, transverse grooves and fine knife grooves are distributed on the shoulder pattern blocks according to the pitch.

[0019] The all-weather radial tire for passenger cars of the present invention significantly improves braking performance on dry, wet and snowy roads. Attached Figure Description

[0020] Figure 1 This is a plan view of the tire tread pattern according to an embodiment of the present invention (for ease of display, the thickness of the small grooves is omitted in this figure, and their center lines are used instead).

[0021] Figure 2 This is a schematic diagram of the composite groove in Embodiment I of the present invention. In the figure, a is a top view, b is a side view, and c is the shape of the center line of the three-dimensional fine groove cross section. The labels L and L / 2 in the figure are only used to indicate the relative positional relationship and do not indicate the specific dimensions; the same applies to H and H / 2.

[0022] Figure 3 This is a schematic diagram of the composite trench in Embodiment II of the present invention; the markings L and L / 3 in the figure are only used to indicate the relative positional relationship and do not indicate specific dimensions; the same applies to H and H / 2;

[0023] Figure 4This is a schematic diagram of the structure of the fine knife groove of embodiment a of the present invention; in the figure, a is a top view, b is a side view, and c is the shape of the center line of the cross-section of the fine knife groove of embodiment a;

[0024] Figure 5 This is a schematic diagram of the structure of the fine knife groove in embodiment b of the present invention; in the figure, a is a top view and b is a side view;

[0025] Figure 6 This is a schematic diagram of the structure of the fine groove of form c in the embodiment of the present invention; in the figure, a is a top view, b is a side view, and c is the shape of the center line of the cross section of the fine groove of form c.

[0026] The symbols R0.3, R0.5, etc., appearing in the above figure are representations of curvature plus radius, used to indicate the shape of the curve. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to specific embodiments.

[0028] Example

[0029] A high-grip all-weather passenger car radial tire, such as Figure 1 As shown in the tire tread pattern diagram, the tread has four longitudinal grooves of unequal width. Distinguished by the tire's mounting direction, from the inside to the outside, they are the first longitudinal groove 1, the second longitudinal groove 2, the third longitudinal groove 3, and the fourth longitudinal groove 4. The tire's centerline lies between the second longitudinal groove 2 and the third longitudinal groove 3.

[0030] Patterned blocks A5 are distributed between the first vertical groove 1 and the second vertical groove 2; patterned blocks B6 are distributed between the second vertical groove 2 and the third vertical groove 3; and patterned blocks C7 are distributed between the third vertical groove 3 and the fourth vertical groove 4. The circumferential range encompassed by the inner edges of the first vertical groove 1 and the fourth vertical groove 4 constitutes the area of ​​the Strong Grasp Special Zone.

[0031] Using the tire's centerline 8 as the dividing line, the inner width of the high-grip zone is 28% of the tread width, and the outer width is 27% of the tread width. Tread blocks A5, B6, and C7 are all equal in width, each being 14% of the tread width. The second longitudinal groove 2 and the third longitudinal groove 3 are also equal in width, each being 7% of the tread width.

[0032] Patterned blocks A5, B6, and C7 each have horizontal grooves distributed on them. These horizontal grooves are composite grooves, and there are two types in total.

[0033] Pattern block A5 has a continuous horizontal groove 9 of type I. The front section of the horizontal groove 9 of type I is obliquely upward, and the angle α1 with the vertical direction (the first vertical groove 1) is 59°. The direction of the rear section of the horizontal groove 9 of type I changes and tends to be horizontal. The angle α2 between the horizontal groove 9 of type I and the second vertical groove 2 is 85°. The turning point of the horizontal groove 9 of type I is at 76% of the width of pattern block A5.

[0034] Pattern blocks B6 and C7 have Form II horizontal grooves, which are hook-shaped overall. Form II horizontal groove 10 on pattern block B6 has a front section that forms an angle β of 97° with the vertical direction (second vertical groove 2), and its rear section slopes upwards, with the turning point located at 21% of the width of pattern block B6. Form II horizontal groove 11 on pattern block C also forms an angle of 97° with the vertical direction (fourth vertical groove 4), and Form II horizontal grooves 10 and 11 on the above two patterns are 180° mirror images of each other and meet at a 34° (γ1) oblique line. Form I horizontal groove 9 on pattern block A meets Form II horizontal groove 10 on pattern block B at a 65° (γ2) oblique line.

[0035] Form I, transverse groove 9 structure as follows Figure 2 As shown, a continuous design is adopted. Three-quarters of the tread depth is a Form I composite groove, half of the full depth H of the Form I composite groove is a uniformly wide large groove, and the remaining half is a 0.6mm wide three-dimensional fine groove. This design improves the contact area and tread block rigidity while ensuring performance on wet and snow surfaces, thereby enhancing braking performance. The three-dimensional fine groove is used to improve the inner drainage capacity and snow accumulation capacity, thus improving grip on wet and snow surfaces. The width of the Form I transverse groove 9 is 0.118 of its pitch width. The three-dimensional fine groove breaks at half the width of tread block A to improve tread block rigidity, which is beneficial for improving dry braking performance. The three-dimensional fine groove adopts a double-fold design, as shown... Figure 2 As shown in Figure c, the three-dimensional fine grooves have radii of curvature R of 0.5mm, 0.3mm, 0.3mm and 0.5mm respectively on the center line of the cross section in the direction perpendicular to the tire tread, so that adjacent tread blocks can interlock with each other when they touch the ground, thereby improving the rigidity of the tread blocks.

[0036] The structure of transverse groove 10 in form II adopts a non-through design, such as... Figure 3 As shown in Figure a, the tread block B is sealed at 1 / 3 of its width to improve outer grip. Three-quarters of the tread depth consists of Form II composite grooves, as shown... Figure 3 As shown in Figure b, in Form II composite grooves, half of the full depth H is a widened large groove, while the remaining half consists of 0.6mm wide three-dimensional fine grooves. This design improves the contact area and tread block rigidity while maintaining performance on wet and snowy surfaces, thereby enhancing braking performance. The three-dimensional fine grooves are designed in a double-fold pattern, as shown in Figure b. Figure 3As shown in Figure b, the three-dimensional fine sipes have radii of curvature R of 0.5mm, 0.3mm, 0.3mm, and 0.5mm respectively along their center lines in the direction perpendicular to the tire tread. This allows adjacent tread blocks to mesh together upon contact with the ground, thereby improving tread block rigidity. The three-dimensional fine sipes are interrupted at 1 / 3 of their length and at their ends to further enhance tread block rigidity, thus improving dry braking performance. The large grooves feature a widened design, with the end width being 1 / 3 of the outlet width. This effectively improves water drainage, enhancing wet braking performance, while also allowing for more snow to be accommodated at the outlet, thus improving snow grip.

[0037] Type I transverse ditch and Type II transverse ditch connect at a 65° angle, forming a combined ditch with the longitudinal ditch. Type I transverse ditch and Type II transverse ditch can simultaneously drain water into the longitudinal ditch on the wetland and form a vortex, which accelerates the drainage speed and enhances the wetland's grip.

[0038] The tires feature a variable pitch tread pattern design, with five different pitches from smallest to largest: PA 15, PB 16, PC 17, PD 18, and PE 19. The width of the lateral grooves varies depending on the pitch.

[0039] Table 1 Tire Pitch Design Parameters

[0040]

[0041] Patterned blocks A5, B6, and C7 are respectively distributed with small three-dimensional grooves of form a, form b, and form c. Small grooves of form a 12 and form c 14 are equally divided within the pitch.

[0042] Form a small groove 12, such as Figure 4 As shown, the trapezoidal zigzag groove consists of 7 segments. The angle λ1 between its centerline and the horizontal line is 45°. The radius of curvature R at the connection point between the first, second, third, fourth, fifth, and sixth segments is 0.5 mm, and the radius of curvature at the connection point between the sixth and seventh segments is 9 mm. The length of each of the first to sixth segments is 4 mm. Figure 4 As shown in Figure b, in form a, two-thirds of the depth of the fine groove 12 is a uniformly wide groove with a width of 0.6 mm. This part adopts a three-dimensional structure with three folds, such as... Figure 4As shown in Figure c, the centerline of the cross-section perpendicular to the tread is a broken line. The initial segment of the centerline is 0.3mm long, followed by four straight segments, transitioning with arcs of curvature radii R of 0.5mm, 0.3mm, 0.5mm, and 0.3mm, with different concave directions of the curvature circles, finally connecting to a 0.3mm long line segment. Form a small sipe 12 improves the ability to cut through water film and snow accumulation, enhancing grip on wet and snowy surfaces. It employs a 3-fold three-dimensional structure to improve the rigidity of the tread blocks. Three sipes are evenly distributed on the maximum pitch PE 19, and two are evenly distributed on the remaining pitches. The angle between the centerline of Form a small sipe 12 and the first straight longitudinal groove 1 is 59°, further enhancing grip on wet and snowy surfaces.

[0043] Form b, small groove 13, such as Figure 5 As shown, half the depth of the pattern is a straight groove with a width of 0.6mm, which is more conducive to water model cutting and at the same time, it quickly drains water into the longitudinal groove to improve the grip of the wetland. The angle λ2 between the form b fine knife groove 13 and the second straight longitudinal groove 2 is 112°. Two form b fine knife grooves 13 are distributed on each pitch. The first one is located at the 5th division of the pitch width, and the second one is located at the 10th division. They break when they encounter the form II transverse groove 10 to make the pressure distribution more uniform and prevent abnormal wear.

[0044] Form c, small groove 14, such as Figure 6 As shown in Figure a, the groove is an S-shaped arc with a radius of curvature R of 5 mm and a width of 0.6 mm. The angle λ3 between the small groove 13 (form c) and the fourth vertical groove 4 is 45°. Figure 6 As shown in Figure b, the 2 / 3 depth of the fine sipe 14 in form c adopts a three-dimensional structure with three folds. The center line of the cross-section of this part in the direction perpendicular to the tread is a broken line, as shown in Figure b. Figure 6 As shown in Figure c, in the direction perpendicular to the tread, the initial segment of the centerline is 0.3mm long, followed by four straight segments, transitioning with arcs of curvature radii R of 0.5mm, 0.3mm, 0.5mm, and 0.3mm, with different concave directions of the curvature circles, finally connecting to a segment of 0.3mm in length. Form c, the small sipes 14, are bisected within the pitch, improving lateral grip while ensuring performance on wet and snow surfaces.

[0045] The shoulder pattern blocks have transverse grooves and fine knife grooves distributed at intervals.

[0046] The performance of the tires in this embodiment of the invention was compared with that of summer tires and winter tires. The larger the number, the better the performance of the product of this invention. As shown in Table 1, the comparison results show that the high-grip all-weather passenger car radial tires provided in this embodiment of the invention have dry braking performance and wet braking performance that are close to or exceed those of top-tier domestic summer tires, and snow acceleration and snow braking performance that are close to or exceed those of top-tier domestic winter tires, thus meeting the requirements for all-weather use.

[0047] Table 2 Comparison of Tire Performance Results

[0048]

[0049]

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An all-weather passenger car radial tire with high grip, characterized in that, The tire tread is provided with four unequal-width straight grooves, which are sequentially a first straight groove, a second straight groove, a third straight groove and a fourth straight groove from the inner side to the outer side of the tire, the center line of the tire is located between the second straight groove and the third straight groove, the first straight groove and the second straight groove are provided with pattern blocks A, the second straight groove and the third straight groove are provided with pattern blocks B, the third straight groove and the fourth straight groove are provided with pattern blocks C, the inner edge of the first straight groove and the inner edge of the fourth straight groove comprise the range of the strong grip special area, the strong grip special area has a width of 50-60% of the width of the running surface, the pattern blocks A, the pattern blocks B and the pattern blocks C have equal widths; the second straight groove and the third straight groove have equal widths. The pattern blocks A are provided with form I transverse grooves, the angle between the form I transverse grooves and the first straight groove is 55-62 degrees, and the angle between the form I transverse grooves and the second straight groove is 82-88 degrees; the pattern blocks B and the pattern blocks C are provided with form II transverse grooves, the angle between the form II transverse grooves on the pattern blocks B and the vertical direction is 94-100 degrees, the angle between the form II transverse grooves on the pattern blocks C and the second straight groove is 94-100 degrees, the form II transverse grooves on the two kinds of pattern blocks are 180-degree mirror images and are connected by 30-38-degree diagonal lines, the form I transverse grooves on the pattern blocks A are connected by 60-70-degree diagonal lines with the form II transverse grooves on the pattern blocks B. The form I transverse grooves are designed to be through, 3 / 4 of the pattern depth of the form I transverse grooves is form I composite grooves, the form I composite grooves are composed of equal-width large grooves and three-dimensional small sipes, and the three-dimensional small sipes are disconnected at 1 / 2 of the length of the transverse grooves. The form II transverse grooves are designed to be non-through, and are sealed at 1 / 3 of the length of the pattern blocks B, 3 / 4 of the pattern depth of the form II transverse grooves is form II composite grooves, the form II composite grooves are composed of variable-width large grooves and three-dimensional small sipes, and the three-dimensional small sipes are disconnected at 1 / 3 of the length of the transverse grooves and at the ends. The tire is provided with variable-pitch patterns, and the pitches are five different pitches from small to large. The pattern blocks A, the pattern blocks B and the pattern blocks C are respectively provided with form a, form b and form c three-dimensional small sipes, the form a three-dimensional small sipes are trapezoidal zigzag sipes and have a 3-fold three-dimensional structure, the form b three-dimensional small sipes are straight grooves, and the form c three-dimensional small sipes are arc grooves and have a 3-fold three-dimensional structure. 1 / 2 of the full depth H of the form I composite grooves is equal-width large grooves, and the rest is three-dimensional small sipes. 1 / 2 of the full depth H of the form II composite grooves is variable-width large grooves, and the rest is three-dimensional small sipes.

2. The all weather passenger car radial tire of claim 1 wherein, With the center line of the tire as a boundary, the inner width of the strong grip special area is 28% of the width of the running surface, the outer width of the strong grip special area is 28% of the width of the running surface, the widths of the pattern blocks A, the pattern blocks B and the pattern blocks C are equal and are all 14% of the width of the running surface, and the widths of the second straight groove and the third straight groove are equal and are both 7% of the width of the running surface.

3. The all weather passenger car radial tire of claim 1 wherein, The distribution pattern I transverse groove on the block A has an angle of 59° with the vertical direction, the distribution pattern II transverse groove on the block B and the block C, the pattern II transverse groove on the block B has an angle of 97° with the vertical direction, the pattern II transverse groove on the block C also has an angle of 97° with the vertical direction, and the pattern II transverse grooves on the two blocks are 180° mirror images and are connected by a 34° diagonal line, and the pattern I transverse groove on the block A is connected by a 65° diagonal line with the pattern II transverse groove on the block B.

4. The all weather passenger car radial tire of claim 1 wherein, The curvature radius R of the cross-section center line of the three-dimensional fine sipe in the direction perpendicular to the tread is 0.5 mm, 0.3 mm, 0.3 mm and 0.5 mm in sequence, so that the adjacent blocks are engaged with each other when the tire is in contact with the ground.

5. The all weather passenger car radial tire of claim 1 wherein, The 2 / 3 of the depth of the form a fine sipe is an equal-width groove, and the 2 / 3 of the depth of the form c fine sipe 14 is also an equal-width groove, the part adopts a 3-fold three-dimensional structure, the center line of the cross-section in the direction perpendicular to the tread is a broken line, the initial line segment of the center line has a length of 0.3 mm, and is connected by four straight line segments, and the circular arcs are connected by a curvature radius R of 0.5 mm, 0.3 mm, 0.5 mm and 0.3 mm, the concave directions of the curvature circles are different, and finally connected by a line segment with a length of 0.3 mm.

6. The all weather passenger car radial tire of claim 1 wherein, The form a fine sipe is divided into three on the maximum pitch and is divided into two on the remaining pitches, the form b fine sipe is distributed two on each pitch, the first one is located at the 5th equal part of the pitch, the second one is located at the 10th equal part of the pitch, and is disconnected when the form II transverse groove is encountered, and the form c fine sipe is distributed two in each pitch and is divided into two.

7. The all weather passenger car radial tire of claim 1 wherein, The shoulder block is provided with transverse grooves and fine sipes according to the pitch.

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