A winter and summer dual-purpose snow tire pattern without studs suitable for ice and snow road surface

Abstract

The present application provides a winter and summer dual-purpose snow tire pattern without studs for ice and snow road surface, mainly for car and bus fleets, to meet the requirements of braking performance and steering stability in winter, and to meet the requirement of wear resistance in summer, and to avoid the complicated tire replacement process.

Description

Technical Field

[0001] This invention relates to snow tire tread patterns, and more particularly to a nailless snow tire tread pattern suitable for both winter and summer use on icy and snowy roads. Background Technology

[0002] Japan has a long and narrow terrain with snow and ice conditions lasting up to five months. Current snow tires meet winter braking requirements but not summer wear resistance needs, making tire replacement cumbersome and costly in terms of manpower and resources. Generally, tires used in snow require the icy and stable grip and handling performance of studless tires, while summer tires need to meet the wet-weather, handling, and wear resistance requirements. Different tire performance requirements are needed depending on their lifespan, thus leading to a complicated tire replacement process. Summary of the Invention

[0003] To address the aforementioned issues, and specifically for regions with prolonged snow cover, particularly radial tires, this invention provides a dual-use (winter and summer) studless snow tire pattern suitable for icy and snowy roads. Primarily designed for truck and bus fleets, it prioritizes meeting the braking and handling stability requirements in winter while also considering wear resistance in summer, thus avoiding the cumbersome tire-changing process.

[0004] The technical solution of this invention is as follows: a winter and summer dual-use studless snow tire tread suitable for icy and snowy roads, including a tread pattern, the tread pattern including tread blocks and tread grooves arranged along the tire circumference, the tread groove I is the center of the tire width, and from the tread groove I to the left and right are tread block I, tread groove II, tread block II, tread groove III, tread block III, tread groove IV, tread block IV, tread groove V, and tread block V. The width of tread groove I, tread groove III, and tread groove V is smaller than the width of tread groove II and tread groove IV; for tread blocks I, tread blocks II, tread blocks III, and tread blocks IV, adjacent tread blocks in the same circumference are connected by reinforcing ribs;

[0005] From top to bottom, lateral sipes Ⅲ, Ⅰ, Ⅱ, Ⅱ, Ⅰ, Ⅲ, and Ⅲ are respectively provided on tread blocks Ⅰ, Ⅱ, Ⅲ, Ⅰ, and Ⅲ. Horizontal sipes Ⅰ and Ⅱ are connected to the tread grooves on the left and right sides of their respective tread blocks, thus dividing the tread blocks into five parts from top to bottom. Horizontal lateral sipes are provided between circumferentially adjacent tread blocks Ⅴ. For two adjacent tread blocks Ⅴ, one has a horizontal lateral groove and the other has a variable-angle lateral groove, and the tire shoulder is an open shoulder. Each tread block Ⅴ has a vertical sipe in the middle, which is connected to both the horizontal lateral groove and the variable-angle lateral groove, and each of the horizontal lateral groove and the variable-angle lateral groove has a vertical sipe above and below it.

[0006] The grooves are equipped with wear indicators, and the depth is designed to be half the depth of the groove or other depths less than the groove depth.

[0007] The depths of transverse groove I, horizontal transverse groove, vertical groove, and horizontal transverse groove are less than or equal to the depth of the wear indicator; the depths of transverse groove II, variable angle transverse groove, and reinforcing rib are greater than the depth of the wear indicator.

[0008] Wear indicators are evenly distributed in six equal parts along the corresponding groove.

[0009] The variable angle lateral groove has a symmetrical structure. From the tread groove V to the tire sidewall, the upper edge of one side of the groove wall is successively a horizontal straight line I, a broken line I, a horizontal straight line II, a broken line II, a horizontal straight line III, a broken line III, a horizontal straight line I, a broken line I, a horizontal straight line II, and a broken line II located on the tread block V. From the tread groove V to the tire sidewall, the width of the variable angle lateral groove tends to increase. The broken line III makes the width of the variable angle lateral groove gradually decrease.

[0010] The vertical groove is located in the middle of pattern block V; the vertical groove is connected to the horizontal straight line II of the variable angle transverse groove;

[0011] Corresponding to the horizontal straight line III and broken line III of the variable-angle transverse ditch, the horizontal transverse ditch connects to a symmetrical ditch, and the width of the symmetrical ditch gradually decreases.

[0012] On both sides of patterned blocks I, II, III, and IV, one side has a wider patterned groove and the other side has a narrower patterned groove; the transverse grooves I, II, and III on each patterned block are inclined in the same direction.

[0013] For pattern blocks I, II, and III, when the transverse groove I is inclined downwards from the wider groove to the narrower groove, the portion of the pattern block containing the upper transverse groove IV extends into the narrower groove, forming a protrusion into the narrower groove; when the transverse groove I is inclined upwards from the lower groove to the narrower groove, the portion of the pattern block containing the lower transverse groove IV extends into the narrower groove, forming a protrusion into the narrower groove.

[0014] The patterned blocks formed by the horizontal grooves I and II on patterned blocks III and IV extend into the wider patterned grooves, forming a protrusion into the wider patterned grooves; moreover, the corner of the patterned block formed between the horizontal groove I and the wider patterned groove is chamfered.

[0015] Pattern block I and pattern block II have curved edges near the wider pattern grooves and broken lines near the narrower pattern grooves.

[0016] Pattern block III has a broken line near the wider pattern groove and a broken line near the narrower pattern groove;

[0017] Pattern block IV has a broken line near the wider pattern groove and a straight line near the narrower pattern groove.

[0018] The pattern block I on the left side extends from a wider pattern groove to a narrower pattern groove. The transverse groove I is set from top to bottom. The part of the pattern block where the upper transverse groove IV is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove.

[0019] The pattern block II on the left side extends from the wider pattern groove to the narrower pattern groove. The transverse groove I is set from top to bottom. The part of the pattern block where the upper transverse groove IV is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove.

[0020] The pattern block Ⅲ on the left side, from the wider pattern groove to the narrower pattern groove, the transverse groove Ⅰ is set from bottom to top, and the part of the pattern block where the lower transverse groove Ⅳ is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove.

[0021] The pattern block IV on the left side extends from the wider pattern groove to the narrower pattern groove. The transverse groove I is set from bottom to top. The part of the pattern block where the lower transverse groove IV is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove.

[0022] In the cross-sectional view, the edges of patterned blocks I, II, III, and IV in the width direction are inclined in the same direction as the transverse groove I.

[0023] In the cross-sectional view, the edges of patterned blocks I, II, III, and IV in the width direction are at the same inclination angle as the transverse groove I, and the transverse grooves I, II, and III are at the same inclination angle.

[0024] The tread pattern is symmetrical; the tread pattern saturation is 67-73%.

[0025] The beneficial effects of this invention are that it provides a winter and summer dual-use studless snow tire tread pattern suitable for icy and snowy roads, mainly used by truck and bus fleets, prioritizing the braking and handling stability requirements in winter icy and snowy conditions, while also taking into account the wear resistance requirements in summer, and avoiding the cumbersome tire changing process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a structural diagram of pattern block I, pattern block II, pattern block III, pattern block IV, and pattern block V.

[0028] Figure 3 This is a schematic cross-sectional view of the steel sheet that forms the transverse groove II.

[0029] Figure 4 This is a schematic cross-sectional view of the steel sheet that forms the transverse groove I.

[0030] Figure 5 This is a schematic cross-sectional view of the steel sheet that forms the transverse groove III.

[0031] Figure 6 It is a cross-sectional schematic diagram of a steel sheet forming horizontal and vertical cutting grooves.

[0032] Figure 7 This is a schematic cross-sectional view of grooves II and IV.

[0033] Figure 8 This is a cross-sectional schematic diagram of groove I, groove III, and groove V.

[0034] Figure 9 This is a schematic diagram of the tread pattern surface of the tire after wear and tear, when it has just been used in the summer. Detailed Implementation

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. It should be understood that the preferred embodiments described herein are only for illustration and explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the following content of the present invention. In this invention, unless otherwise expressly specified and limited, the technical terms used in this application should have the ordinary meaning understood by those skilled in the art.

[0036] like Figures 1-9 As shown, a dual-use (winter and summer) studless snow tire tread suitable for icy and snowy roads includes a tread pattern. The tread pattern includes tread blocks and tread grooves arranged along the tire circumference. The tread groove I1 is located at the center of the tire width. From tread groove I to the left and right, the tread blocks are arranged as follows: tread block I6, tread groove II2, tread block II7, tread groove III3, tread block III8, tread groove IV4, tread block IV9, tread groove V5, and tread block V10. The width of tread grooves I1, III3, and V5 is smaller than the width of tread grooves II2 and IV4. For tread blocks I6, II7, III8, and IV9, adjacent tread blocks in the same circumferential direction are connected by reinforcing ribs 9. While ensuring tread saturation, the connection by reinforcing ribs 9 improves the overall rigidity of the tread blocks and ensures product mileage.

[0037] Patterned blocks I6, II7, III8, and IV9 are respectively equipped with horizontal grooves III14, I12, II13, II13, I12, and III14 from top to bottom. Horizontal grooves I12 and II13 connect to the grooves on the left and right sides of their respective blocks, thus dividing the blocks into five sections from top to bottom. The presence of horizontal grooves III14, I12, and II13 facilitates the removal of ice and snow, and rain, increasing grip.

[0038] Horizontal lateral grooves 15 are provided between circumferentially adjacent tread blocks V10; one of two adjacent tread blocks V10 has a horizontal lateral groove 16, and the other has a variable-angle lateral groove 17. The tire shoulder is an open shoulder. This facilitates the removal of ice and snow and rain, and increases grip performance.

[0039] Each patterned block V has a vertical groove 18, which is connected to the horizontal transverse groove and the variable angle transverse groove 17 respectively, and the horizontal transverse groove and the variable angle transverse groove 17 each have a vertical groove 18 above and below.

[0040] Wear indicators 19 are arranged in the grooves, especially groove V. The depth of the wear indicators 10 is designed to be half the depth of the groove or other depths less than the groove depth, and they are evenly distributed in a 6-sixth circle. The depth of the wear indicators 10 can be designed according to the wear conditions in winter and summer.

[0041] The depths of the transverse sipe I 12, the horizontal transverse sipe 15, the vertical sipe 18, and the horizontal transverse groove 16 are less than or equal to the depth of the wear indicator 19; the depths of the transverse sipe II 13, the variable-angle transverse groove 17, and the reinforcing rib 11 are greater than the depth of the wear indicator 19. Thus, in winter, the transverse sipe I 12, the horizontal transverse sipe, the vertical sipe 18, the horizontal transverse groove 16, the transverse sipe II 13, the variable-angle transverse groove 17, and the reinforcing rib 11 are all present, while in summer only the transverse sipe II 13, the variable-angle transverse groove 17, and the reinforcing rib 11 are present. This increases the rigidity between the circumferential tread blocks, meeting the requirements for braking and handling stability in winter ice and snow, while also taking into account the wear resistance requirements in summer, thus avoiding the cumbersome tire changing process.

[0042] The studless snow tire tread pattern provided in this application, suitable for icy and snowy roads, allows for the design of the depth of each sipe and groove based on the duration of winter icy and snowy weather and summer rainy and snowy weather. This prioritizes meeting the braking and handling stability requirements of winter icy and snowy conditions while also considering the wear resistance requirements of summer, avoiding the cumbersome tire changing process. Furthermore, the depth of each sipe and groove can be further designed to take into account the change from winter icy and snowy weather to summer rainy and snowy weather, allowing the tire to be better used in the intermediate seasons.

[0043] The depth of the transverse groove Ⅲ14 is less than the depth of the wear indicator 19.

[0044] The horizontal lateral groove 16 and the variable-angle lateral groove 17 on tread block V10 are connected to tread groove V5. On tread block V, they extend from tread groove V5 towards the tire sidewall, and the width of the variable-angle lateral groove tends to increase. The narrowest width is 6-8mm, and the widest width is 10-14mm.

[0045] The tire shoulder is an open shoulder. In cross-section, the variable angle lateral groove 17 has a symmetrical structure. From the tread groove V to the tire sidewall, the upper edge of one side of the groove wall is successively a horizontal straight line I170, a broken line I171, a horizontal straight line II172, a broken line II173, a horizontal straight line III174, and a broken line III175. The horizontal straight line I170, the broken line I171, the horizontal straight line II172, and the broken line II173 are located on the tread block V10. From the tread groove V to the tire sidewall, the width of the variable angle lateral groove tends to increase. The broken line III makes the width of the variable angle lateral groove gradually decrease.

[0046] The vertical groove 18 is located in the middle of the pattern block V; the vertical groove 18 is connected to the horizontal straight line II 172 of the variable angle transverse groove 17.

[0047] Corresponding to the horizontal straight line III and broken line III of the variable angle transverse ditch, the horizontal transverse ditch 16 connects to a symmetrical ditch, and the width of the symmetrical ditch 20 gradually decreases.

[0048] The design of horizontal and variable-angle lateral grooves greatly expels ice and snow, improving tire handling stability. The variable-angle lateral grooves also facilitate water drainage.

[0049] The tire shoulder is an open shoulder and is designed with heat dissipation grooves 21 to enhance the tire's ability to shovel and remove snow when driving on icy and snowy roads, ensure the tire's grip on ice and snow, and thus ensure the tire's handling stability.

[0050] On both sides of patterned blocks I6, II7, III8, and IV9, one side has a wider patterned groove, and the other side has a narrower patterned groove. The transverse grooves I, II, and III on each patterned block are inclined in the same direction. For patterned blocks I, II, and III, when the transverse groove I is inclined downwards from the wider to the narrower groove, the portion of the patterned block containing the upper transverse groove III14 extends into the narrower groove, forming a protrusion into the narrower groove. Similarly, when the transverse groove I is inclined upwards from the lower to the narrower groove, the portion of the patterned block containing the lower transverse groove III14 extends into the narrower groove, forming a protrusion into the narrower groove.

[0051] Because tread blocks I, II, and III are located in the middle of the tread pattern and have many steel grooves, their rigidity is weak. The tread block where the transverse sipe Ⅲ14 is located protrudes slightly outward from the narrower tread groove to increase the tread block area, which can improve the rigidity of the tread block while ensuring snow performance.

[0052] Transverse groove I is located at 1 / 5-1 / 4 of the patterned block, transverse groove II is located at 1 / 2-1 / 3 of the patterned block, and transverse groove III is located at 1 / 8-1 / 7 of the patterned block.

[0053] The cross-sectional views of patterned blocks I6, II7, III8, and IV9 resemble quadrilaterals. Furthermore, in these cross-sections, the width sides of patterned blocks I6, II7, III8, and IV9 are inclined in the same direction as the transverse groove I. The inclination angle, i.e., the angle with the horizontal direction, is 8°-10°. The purpose of this inclination is to improve braking performance and handling stability in winter ice and snow while maintaining consistent stiffness.

[0054] Furthermore, in the cross-sectional view, the inclination angles of the edges in the width direction of patterned blocks I6, II7, III8, and IV9 can be consistent with those of the transverse groove I, and the inclination angles of the transverse grooves I12, II13, and III14 can also be consistent. Consistent orientation is beneficial for noise reduction and handling stability.

[0055] Tread blocks I6 and II7 have curved edges near the wider tread grooves and broken lines near the narrower tread grooves. The overall tread pattern is designed to improve handling stability and mileage.

[0056] Tread block III8 has a broken line near the wider tread groove and a broken line near the narrower tread groove. Tread block IV9 has a broken line near the wider tread groove and a straight line near the narrower tread groove. Overall, the tread pattern is designed to improve handling stability and mileage.

[0057] The pattern blocks III8 and IV9 are divided into five sections by transverse grooves I12 and II13. The three middle sections extend into the wider groove, forming a protrusion. Furthermore, in the cross-sectional view, the angle formed by transverse groove I12 and the pattern block, on the side of the wider groove, is chamfered, particularly the angle closest to transverse groove II13.

[0058] On the left side, the patterned block I6 transitions from a wider to a narrower groove. The transverse groove I is angled downwards, and the portion of the patterned block containing the upper transverse groove III14 extends into the narrower groove, forming a protrusion. This design ensures heat dissipation while improving the overall rigidity of the patterned block.

[0059] On the left side, the patterned block II7 transitions from a wider to a narrower groove. The transverse groove I slopes downwards, and the portion of the patterned block containing the upper transverse groove III14 extends into the narrower groove, forming a protrusion. This design ensures heat dissipation while improving the overall rigidity of the patterned block.

[0060] On the left side, the patterned block Ⅲ8, from the wider patterned groove to the narrower patterned groove, has a transverse slit I that slopes upwards. The portion of the patterned block containing the lower transverse slit III14 extends into the narrower patterned groove, forming a protrusion. This design ensures heat dissipation of the patterned block while improving its overall rigidity.

[0061] The patterned blocks on the left and right sides of the groove are staggered, with the staggered distance being approximately 1 / 4 to 1 / 2 of the length of the patterned block, which is beneficial for grip performance on ice.

[0062] The tread pattern is symmetrical, with the pattern on the left side of the tire rotating 180° through the center to form the pattern on the right side.

[0063] The width of pattern block II7, pattern block III8, and pattern block IV9 is 0.9-1.1 times that of pattern block I6, and the width of pattern block V10 is 1.4-1.5 times that of pattern blocks II7, III8, and IV9.

[0064] The width of grooves III3 and V5 is 0.9-1.1 times that of groove I1. The width range of grooves I1, III3, and V5 is 0.75-2mm. The width of grooves II2 and IV4 is 6-8mm.

[0065] like Figure 7 The diagram shows cross-sectional views of tread grooves II and IV. Grooves II and IV gradually decrease in width from the tire surface downwards, then remain constant, with a rounded bottom. The height L2 of the gradually narrowing section is 10-11 mm, while the height L1-L2 of the constant width section is 8.5-10 mm. The maximum width is 6-8 mm, and the minimum width is 4-5 mm. Additionally, "C" in the diagram represents a fully rounded corner, meaning the bottom cross-section of the tread groove is rounded.

[0066] like Figure 8For grooves I, III, and V, the grooves extend downwards from the tire surface, maintaining a constant width, and the bottom of the grooves is arc-shaped.

[0067] The depth L1 of groove I is 15-16mm and the width W1 is 1.2-1.5mm; the depth L1 of groove III is 15-16mm and the width W1 is 1.2-1.5mm and 0.7-0.8mm respectively; the depth L1 of groove V is 10-11mm and the width W1 is 1-1.2mm.

[0068] The horizontal transverse groove 15 has a depth of 0.6-0.8mm and a width of 6-8mm; the horizontal transverse groove on the pattern block V has a depth of 8-10mm and a width of 4-6mm, and the variable angle transverse groove has a depth of 12-14mm and a width of 6-14mm.

[0069] Two adjacent transverse grooves II13 on the same patterned block are formed together by a 2D steel sheet, such as... Figure 3 This is a vertical sectional view of the 2D steel sheet, and also a sectional view of two adjacent transverse sipes II13. The 2D steel sheet is "n"-shaped; therefore, the distance between the two farthest edges of two adjacent transverse sipes II13 is the dimension W1 of the 2D steel sheet, which is 3-6 mm; the distance between the two nearest edges of two adjacent transverse sipes II13 is the dimension W2 of the 2D steel sheet, which is 2-4 mm; the depth of the transverse sipes II13 is the dimension L1 of the 2D steel sheet, which is 12-14 mm; the normal distance from the part between two adjacent transverse sipes II13 to the tread is the dimension L2 of the 2D steel sheet, which is 1.5-3 mm. Additionally, "C" in the figure indicates that the bottom of the steel sheet is fully rounded, meaning the bottom section of the transverse sipes II13 is arc-shaped.

[0070] The transverse groove I on the patterned block is formed by a 3D steel sheet, which is wavy in shape. Figure 4 This is a vertical sectional view of the 3D steel sheet, and also a sectional view of the transverse groove I. The width of the transverse groove I at the same depth is the W1 dimension of the 3D steel sheet, which is 0.6-0.8mm; the depth of the transverse groove I is the L1 dimension of the 3D steel sheet, which is 6-10mm; in addition, the uppermost and lowermost ends of the transverse groove I are vertical sections, and the dimensions of these two vertical sections are the L1 and L2 dimensions of the 3D steel sheet, respectively. The L1 dimension is 5-7mm, and the L2 dimension is 2-3mm. The middle curved section of the transverse groove I is S-shaped, and the dimensions of this part are L-L1-L2. In addition, C in the figure represents a full rounded corner, that is, the middle curved section is S-shaped.

[0071] The transverse groove III on the patterned block is formed by a 2D steel sheet, such as Figure 5This is a vertical section view of the 2D steel sheet, and also a section view of the transverse groove III; the width of the transverse groove III is the size of the 2D steel sheet W1, which is 0.8-1mm; the depth of the transverse groove III is the size of the 2D steel sheet L1, which is 2-4mm; in addition, C in the figure represents a full rounded corner, that is, the bottom section of the transverse groove III is an arc shape.

[0072] The horizontal transverse grooves on patterned block V are formed by 2D steel sheets, such as... Figure 6 This is a vertical section view of the 2D steel sheet, and also a section view of the horizontal transverse groove; the width of the horizontal transverse groove is the size of the 2D steel sheet W1, which is 0.4-0.6mm; the depth of the horizontal transverse groove is the size of the 2D steel sheet L1, which is 8-10mm; in addition, C in the figure represents a full rounded corner, that is, the bottom section of the horizontal transverse groove is an arc shape.

[0073] The vertical grooves on patterned block V are formed by 2D steel sheets, such as... Figure 6 This is a vertical sectional view of the 2D steel sheet, and also a sectional view of the vertical groove; the width of the vertical groove is the size of the 2D steel sheet W1, which is 0.4-0.6mm; the depth of the vertical groove is the size of the 2D steel sheet L1, which is 8-10mm; in addition, C in the figure represents a full rounded corner, that is, the bottom section of the vertical groove is arc-shaped.

[0074] For tire treads with the above sipe depth, after 50% wear, the tread surface will look like it did when the tire was first used in summer. Figure 9 As shown. The customer will likely have the tires installed in October, and they will be used from winter until April of the following year, and from summer until October, at which point the tires' lifespan is complete.

[0075] The combined design of the tread block grooves in this application enhances the rain and snow removal performance of the tread pattern, and the reinforcing ribs between the blocks improve the overall handling stability of the tire.

[0076] The tread pattern saturation should be 67-73%, ideally 70%. This can improve the product's mileage to some extent.

[0077] Patterned blocks I, II, III, and IV adopt an equal pitch design, and the number of pitches can be 60.

[0078] Patterned block V adopts an equal pitch design, and the number of pitches can be 30.

[0079] The tread pattern is designed with nearly 1,000 3D steel sheets, which can ensure grip and handling stability on icy and snowy roads. The tread groove design of this application, combined with the open shoulder design, can ensure the tire's traction in the straight direction and improve the tire's water drainage performance.

[0080] The above descriptions are merely preferred embodiments of the present invention, not all embodiments. The scope of protection of the present invention is not limited thereto. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. It should be noted that for those skilled in the art and any person skilled in the art, any equivalent substitutions or changes made to the technical solutions and inventive concepts of the present invention, as well as any changes and improvements made, without departing from the overall concept and spirit of the present invention, should also be considered within the scope of protection of the present invention.

Claims

1. A nailless snow tire tread pattern suitable for both winter and summer use on icy and snowy roads, characterized in that: The tire includes tread pattern, which includes tread blocks and tread grooves arranged along the tire circumference. The tread groove I (1) is located at the center of the tire width. From tread groove I to the left and to the right, the tread blocks are tread blocks I (6), tread grooves II (2), tread blocks II (7), tread grooves III (3), tread blocks III (8), tread grooves IV (4), tread blocks IV (9), tread grooves V (5), and tread blocks V (10). The width of tread grooves I (1), tread grooves III (3), and tread grooves V (5) is smaller than the width of tread grooves II (2) and tread grooves IV (4). For tread blocks I (6), tread blocks II (7), tread blocks III (8), and tread blocks IV (9), adjacent tread blocks in the same circumference are connected by reinforcing ribs (11). From top to bottom, the pattern blocks I (6), II (7), III (8), and IV (9) are respectively provided with horizontal grooves III (14), I (12), II (13), and III (14); the horizontal grooves I (12) and II (13) are connected to the pattern grooves on the left and right sides of the pattern block, thus dividing the pattern block into five parts from top to bottom. A horizontal lateral groove (15) is provided between adjacent circumferential tread blocks V (10); one of two adjacent tread blocks V (10) is provided with a horizontal lateral groove (16), and the other is provided with a variable angle lateral groove (17), and the tire shoulder is an open tire shoulder; a vertical groove (18) is provided in the middle of each tread block V, which is connected to the horizontal lateral groove and the variable angle lateral groove (17) respectively, and the horizontal lateral groove and the variable angle lateral groove (17) are provided with vertical grooves (18) above and below respectively; The grooves are equipped with wear indicators (19), and the depth is designed to be half the depth of the groove or other depths less than the groove depth. The depths of the transverse groove I (12), the horizontal transverse groove (15), the vertical groove (18), and the horizontal transverse groove (16) are less than or equal to the depth of the wear indicator (19); the depths of the transverse groove II (13), the variable angle transverse groove (17), and the reinforcing rib (11) are greater than the depth of the wear indicator (19).

2. The nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 1, characterized in that: Wear indicators (19) are evenly distributed along the six circumferences of the corresponding groove.

3. The winter and summer dual-use nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 1, characterized in that: The variable angle lateral groove (17) has a symmetrical structure. From the tread groove V to the tire sidewall, the upper edge of one side of the groove wall is successively a horizontal straight line I (170), a broken line I (171), a horizontal straight line II (172), a broken line II (173), a horizontal straight line III (174), a broken line III (175), a horizontal straight line I (170), a broken line I (171), a horizontal straight line II (172), and a broken line II (173) located on the tread block V (10). From the tread groove V to the tire sidewall, the width of the variable angle lateral groove tends to increase. The broken line III makes the width of the variable angle lateral groove gradually decrease. The vertical groove (18) is located in the middle of the pattern block V; the vertical groove (18) is connected to the horizontal straight line II (172) of the variable angle transverse groove (17); The horizontal straight line III and broken line III corresponding to the horizontal transverse ditch with variable angle are connected to a symmetrical ditch, and the width of the symmetrical ditch (20) gradually decreases.

4. The winter and summer dual-use nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 1, characterized in that: On both sides of patterned blocks I, II, III, and IV, one side has a wider patterned groove and the other side has a narrower patterned groove; the transverse grooves I, II, and III on each patterned block are inclined in the same direction. For pattern blocks I, II, and III, when the transverse groove I is inclined downwards from the wider groove to the narrower groove, the portion of the pattern block containing the upper transverse groove III extends into the narrower groove, forming a protrusion into the narrower groove; for pattern blocks I, II, and III, when the transverse groove I is inclined upwards from the bottom from the wider groove to the narrower groove, the portion of the pattern block containing the lower transverse groove III extends into the narrower groove, forming a protrusion into the narrower groove. The patterned blocks formed by the horizontal grooves I and II on patterned blocks III (8) and IV (9) extend into the wider patterned grooves, forming a protrusion into the wider patterned grooves; and the corner of the patterned block formed between the horizontal groove I and the wider patterned groove is chamfered.

5. The nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 4, characterized in that: Pattern block I (6) and pattern block II (7) have curved edges near the wider pattern grooves and broken lines near the narrower pattern grooves. Pattern block Ⅲ (8) has a broken line near the wider pattern groove and a broken line near the narrower pattern groove; Pattern block Ⅳ (9) has a broken line near the wider pattern groove and a straight line near the narrower pattern groove.

6. The winter and summer dual-use nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 5, characterized in that: The pattern block I on the left side extends from the wider pattern groove to the narrower pattern groove. The transverse groove I is set from top to bottom. The part of the pattern block where the upper transverse groove III is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove. The pattern block II on the left side extends from the wider pattern groove to the narrower pattern groove. The transverse groove I is set from top to bottom. The part of the pattern block where the upper transverse groove III is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove. The pattern block Ⅲ on the left side, from the wider pattern groove to the narrower pattern groove, the transverse groove Ⅰ is set from bottom to top, and the part of the pattern block where the lower transverse groove Ⅲ is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove. The pattern block IV on the left side extends from the wider pattern groove to the narrower pattern groove. The transverse groove I is set from bottom to top. The part of the pattern block where the lower transverse groove III is located extends into the narrower pattern groove, forming a protrusion into the narrower pattern groove.

7. The winter and summer dual-use nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 4, characterized in that: In the cross-sectional view, the edges of patterned blocks I (6), II (7), III (8), and IV (9) in the width direction are inclined in the same direction as the transverse groove I.

8. The winter and summer dual-use nail-free snow tire tread pattern suitable for icy and snowy roads as described in claim 7, characterized in that: In the cross-sectional view, the edges of patterned blocks I (6), II (7), III (8), and IV (9) in the width direction are at the same angle as the inclination angle of transverse groove I, and the inclination angles of transverse groove I, transverse groove II, and transverse groove III are the same.

9. The winter and summer dual-use nail-free snow tire tread pattern suitable for icy and snowy roads according to any one of claims 1-8, characterized in that: The tread pattern is symmetrical; the tread pattern saturation is 67-73%.

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