All-steel truck radial tire

Abstract

The invention relates to the technical field of tire pattern design, and discloses an all-steel truck radial tire, the tread pattern of the tire adopts longitudinally through main grooves to ensure the basic drainage performance, and four main grooves are communicated by arranging shallow grooves, so that the overall rigidity of the tread is maintained; meanwhile, the specifications of the shallow grooves in the ribs are changed along with the pitch through variable pitch arrangement, stress can be dispersed in different directions when the tire rolls, so that local stress concentration is reduced, and the anti-cracking capacity of the tread is improved. In addition, the main grooves are stepped grooves, so that the self-cleaning efficiency of the tire can be improved. Furthermore, wing rubber is arranged in the tread and extends to the edge of the bottom of the main groove, so that the probability of groove bottom cracking is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tire tread patterns, in particular to a full steel radial truck tire. BACKGROUND

[0002] Full steel radial truck tires are widely used in heavy load, long distance and mixed road transportation scenarios, and the tread pattern needs to balance wear resistance, traction, handling, drainage and mud removal, self-cleaning and damage resistance. The existing truck tires usually adopt a structure of multiple circumferentially extending longitudinal main grooves combined with rib / bar pattern blocks to provide guidance and drainage capacity. However, under heavy load and complex road conditions, gravel and sand are easily squeezed into the pattern groove to form stone trapping, which causes the groove wall to be cut or the groove bottom to be stress concentrated, thereby causing early failure such as groove bottom cracking, alligator cracking and chunking. At the same time, the shoulder area is subjected to large shear and bending deformation under turning and braking conditions, and is also prone to shoulder tearing or crack propagation, affecting the service life and safety of the tire.

[0003] Chinese patent CN103507573A discloses a radial tire tread pattern structure, which sets a Z-shaped central groove extending in the circumferential direction in the center of the tread, sets a second main groove on both sides, sets a lateral groove to connect the central groove and the second main groove, and sets a transverse sipe on the shoulder pattern block to balance the traction, wet performance and certain anti-stone trapping requirements. However, this type of solution focuses on improving drainage and edge effect through the central Z-shaped groove and the connecting groove, and the measures for stress relief and anti-groove bottom cracking in the longitudinal main groove bottom area under heavy load conditions are relatively limited, and the problems of groove bottom cracking and groove wall damage caused by stone trapping may still occur.

[0004] Chinese patent CN105667218A provides a tire tread pattern structure, which sets staggered "stone removal blocks / stone blocks" structures in the groove area to form a protective and stone removal effect on the side of the groove to reduce the risk of damage to the groove bottom by sharp objects. However, this solution may still have problems such as mud and sand accumulation, complex manufacturing and demolding under complex road conditions, making it difficult to simultaneously balance efficient self-cleaning and inhibit groove bottom crack propagation.

[0005] Therefore, there is an urgent need for a tread pattern structure more suitable for heavy load conditions, which comprehensively optimizes the groove wall / groove bottom structure of the longitudinal main groove, the connecting method of the rib inner shallow groove and the arrangement of the tread transition compound, to further improve the stone removal and self-cleaning ability while ensuring guidance and drainage. SUMMARY

[0006] The present application provides a full steel radial truck tire to significantly reduce the occurrence rate of tread alligator cracking by the design of the tread pattern.

[0007] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application: A full steel truck radial tire comprises a tread, the tread is provided with an intermediate rib, a left side rib, a right side rib, a left shoulder rib and a right shoulder rib extending along the tire circumferential direction; the intermediate rib is located in the center of the tread, and the left and right sides of the intermediate rib are sequentially provided with the side rib and the shoulder rib from inside to outside; the tire comprises a first longitudinal main groove, a second longitudinal main groove, a third longitudinal main groove and a fourth longitudinal main groove extending along the tire circumferential direction from left to right, and the above-mentioned main grooves are distributed between the ribs at intervals; characterized in that, The tread is divided into a plurality of pitches along the tire circumferential direction, the pitches comprise long pitches L and short pitches S, and the intermediate rib, the left side rib, the right side rib, the left shoulder rib and the right shoulder rib are respectively provided with shallow groove patterns; The intermediate rib is provided with a plurality of intermediate shallow grooves arranged along the circumferential direction, the first end and the second end of the intermediate shallow groove are respectively communicated with the adjacent second longitudinal main groove and third longitudinal main groove, and the two ends are high and low; the intermediate shallow groove is a zigzag type, and comprises a first inflection point, a second inflection point, a third inflection point and a fourth inflection point from top to bottom, the first inflection point is located at the starting end of the pitch, and the fourth inflection point is located inside the pitch; the first inflection point and the fourth inflection point are respectively horizontally extended to the opposite directions and communicated with the adjacent main groove, and the shallow groove between the first inflection point and the fourth inflection point is in a Z shape; The left side rib is provided with a plurality of left side shallow grooves sequentially communicated, the left side shallow groove and one side edge of the rib form a triangle, that is, the first end and the second end of the left side shallow groove are communicated with the same main groove; the left side shallow groove comprises a first left side shallow groove and a second left side shallow groove forming a triangle, the first left side shallow groove is located above the second left side shallow groove, and the first left side shallow groove and the second left side shallow groove are both in a Z shape, the connection end of the first left side shallow groove and the second left side shallow groove is a first inflection point of the left side shallow groove, and the inflection point is communicated with the adjacent main groove; two sections of zigzag profiles are arranged beside the first inflection point, and the two sections of zigzag profiles form a quadrilateral concave-convex groove with the first left side shallow groove and the second left side shallow groove; The right side rib is provided with a plurality of right side shallow grooves sequentially communicated, and the pattern formed by the right side shallow groove is consistent with or left-right symmetrical with the pattern formed by the left side shallow groove; The left shoulder rib is provided with a plurality of left shoulder shallow grooves arranged along the circumferential direction, and one left shoulder shallow groove is distributed in each pitch; the left shoulder shallow groove is a two-section zigzag line, the inner end of the left shoulder shallow groove is communicated with the first longitudinal main groove, and the outer end is located inside the left shoulder rib; The right shoulder rib is provided with a plurality of right shoulder shallow grooves arranged along the circumferential direction, and one right shoulder shallow groove is distributed in each pitch; the profile of the right shoulder shallow groove is centrally symmetrical with the left shoulder shallow groove, the inner end of the right shoulder shallow groove is communicated with the fourth longitudinal main groove, and the outer end is located inside the right shoulder rib.

[0008] Preferably, the pitch includes 24 long pitches L and 28 short pitches S, arranged in the order SLSSS-LSLSS-SLSLS-SLSSS-LSLSL-SLLLS-LSLLL-SLSLL-SLLLS-LSSSL-SS.

[0009] Preferably, the main groove is a stepped groove with a T-shaped patterned groove in its longitudinal section, and a stepped platform is provided on the inner side of the two side groove walls; preferably, the angle between the two side groove walls that connect with the tread and the vertical direction in the main groove varies within a certain range, ranging from 15° to 27°, and the opening angle of the main groove is 41° to 43°; the total groove depth of the main groove is 13.3 to 13.7 mm, the groove depth below the stepped platform is 3.8 to 4.2 mm, and the groove width of the main groove is 13.3 to 13.7 mm; even more preferably, the stepped platform width is 0.8 to 1.2 mm.

[0010] Preferably, the longitudinal cross-section of the middle shallow ditch, the left shallow ditch, and the right shallow ditch in the ditch width direction is a U-shaped ditch with a ditch depth of 2.8~3.2mm and a ditch width of 0.8~1.2mm.

[0011] Preferably, the longitudinal cross-section of the left shoulder shallow groove and the right shoulder shallow groove in the groove width direction is a U-shaped groove with a groove depth of 1.3~1.7mm and a groove width of 0.8~1.2mm.

[0012] Preferably, the longitudinal section of the quadrilateral groove is sawtooth-shaped, with a tooth depth of 0.35~0.45mm, a tooth top width of 0.10~0.20mm, a tooth bottom width of 0.50~0.70mm, a tooth top spacing of 0.50~0.60mm, and a tooth bottom spacing of 0.05~0.15mm.

[0013] Preferably, the shallow groove in the middle is a centrally symmetrical shape, and the angle between the shallow groove and the horizontal plane between the first inflection point and the second inflection point is 40~42°.

[0014] Preferably, both the left and right shallow grooves are symmetrical shapes, with their first inflection point located in the middle of the length of the pitch. Preferably, the two broken-line contours set next to the first inflection point are perpendicular to the adjacent shallow grooves, and the inflection points of the two broken-line contours do not cross the midline in the direction of the pitch width.

[0015] Preferably, the angle between the left shoulder shallow groove, the right shoulder shallow groove and the adjacent main groove is 43~47°; Preferably, the inner ends of the left shoulder shallow groove and the right shoulder shallow groove within the same pitch are 1 / 2 pitch apart in the circumferential direction of the tire.

[0016] Preferably, the tread is provided with wing rubber, which extends towards the edge of the bottom of the main groove, and the distance between the wing rubber and the center line of the bottom of the main groove is d, 3.5mm≤d≤4.0mm.

[0017] The application provides a tire, the tire tread pattern adopts longitudinal through main grooves to ensure basic drainage, and shallow grooves are arranged to connect four main grooves, so that the overall rigidity of the tire tread is maintained; meanwhile, the ribs are arranged in variable pitches, so that the shallow grooves in the ribs change specifications along with the pitches, stress is dispersed in different directions during tire rolling, local stress concentration is reduced, and the anti-cracking capacity of the tire tread is improved. In addition, the main grooves are arranged in stepped grooves, so that the self-cleaning efficiency of the tire is improved. Further, the wing rubber in the tire tread extends to the edge of the bottom of the main groove, so that the probability of groove bottom cracking is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a development view of the whole-steel radial tire tread of the application.

[0019] Figure 2 It is a B-B sectional view of the main groove. Figure 1

[0020] It is a F-F sectional view of the middle shallow groove, the left shallow groove and the right shallow groove. Figure 3 Figure 1 It is a C-C sectional view of the middle shallow groove, the left shallow groove and the right shallow groove extending to adjacent main grooves.

[0021] Figure 4 Figure 1 It is a H-H sectional view of the left shoulder shallow groove and the right shoulder shallow groove extending to adjacent main grooves and the tire tread.

[0022] Figure 5 It is a I-I sectional view of the left shoulder shallow groove and the right shoulder shallow groove. Figure 1

[0023] It is a H-H sectional view of the left shoulder shallow groove and the right shoulder shallow groove extending to adjacent main grooves and the tire tread. Figure 6 Figure 1 It is a D-D sectional view of the quadrilateral concave-convex groove extending to adjacent tire treads.

[0024] Figure 7 The reference signs: 10 is a middle rib, 11 is a left rib, 12 is a right rib, 13 is a left shoulder rib, 14 is a right shoulder rib, 21 is a first longitudinal main groove, 22 is a second longitudinal main groove, 23 is a third longitudinal main groove, 24 is a fourth longitudinal main groove, 25 is a ladder, 30 is a middle shallow groove, 31 is a left shallow groove, 311 is a first left shallow groove, 312 is a second left shallow groove, 313 is a quadrilateral concave-convex groove, 32 is a right shallow groove, 33 is a left shoulder shallow groove, 34 is a right shoulder shallow groove, and 4 is wing rubber. Figure 1 DETAILED DESCRIPTION

[0025] DETAILED DESCRIPTION

[0026] ​​​​The technical solutions in the embodiments will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] A full steel truck radial tire comprises a tread, Figure 1 One of the preferred embodiments of the tread is shown in the structure schematic diagram unfolded in the plane state, and Figure 1 In the drawings, the pitch L and the pitch S of the lower half of the tread are also shown by the dashed lines.

[0029] As Figure 1 shown, along the direction of the tread width from left to right, the intermediate rib 10, the left side rib 11, the right side rib 12, the left shoulder rib 13 and the right shoulder rib 14 extending along the tire circumferential direction are sequentially arranged. Along the direction of the tread width from left to right, the first longitudinal main groove 21, the second longitudinal main groove 22, the third longitudinal main groove 23 and the fourth longitudinal main groove 24 extending along the tire circumferential direction are also sequentially arranged. The first longitudinal main groove 21 is arranged between the left side rib 11 and the left shoulder rib 13, the second longitudinal main groove 22 is arranged between the intermediate rib 10 and the left side rib 11, the third longitudinal main groove 23 is arranged between the intermediate rib 10 and the right side rib 12, and the fourth longitudinal main groove 24 is arranged between the right side rib 12 and the right shoulder rib 14.

[0030] The tread is divided into several pitches along the tire circumferential direction, and the pitch includes a long pitch L and a short pitch S. For example, Figure 1 The pitch of the tread shown in the drawings includes 24 long pitches L and 28 short pitches S, and is arranged in the order of SLSSS-LSLSS-SLSLS-SLSSS-LSLSL-SLLLS-LSLLL-SLSLL-SLLLS-LSSSL-SS.

[0031] The middle rib 10, the left rib 11, the right rib 12, the left shoulder rib 13 and the right shoulder rib 14 are respectively provided with shallow groove patterns. As can be observed from the figure, the overall tire pattern is asymmetric, and mainly composed of large-area block patterns. The patterns in different regions are designed differently, which can bring different forces and performance to different parts of the tire.

[0032] The middle rib 10 is provided with a plurality of middle shallow grooves 30 arranged in the circumferential direction. The two ends of the middle shallow grooves 30 are respectively communicated with the adjacent second longitudinal main groove 22 and third longitudinal main groove 23, and the two ends are high and low respectively. The adjacent two middle shallow grooves 30 divide the middle rib 10 into a plurality of pattern blocks. The middle shallow groove 30 is a polyline, which includes a first inflection point, a second inflection point, a third inflection point and a fourth inflection point from top to bottom. The first inflection point is located at the starting end of the pitch, and the fourth inflection point is located inside the pitch. The first inflection point and the fourth inflection point respectively extend horizontally in opposite directions and are communicated with the adjacent main groove. The shallow groove between the first inflection point and the fourth inflection point is Z-shaped.

[0033] The left rib 11 is provided with a plurality of left shallow grooves 31 communicated in sequence. The left shallow grooves 31 are located in one pitch, and the left shallow grooves 31 and one side edge of the rib form a triangle, that is, the two ends of the left shallow grooves 31 are communicated with the same main groove. The left shallow grooves 31 include a first left shallow groove 311 and a second left shallow groove 312 forming a triangle. The first left shallow groove 311 is located above the second left shallow groove 312, and the first left shallow groove 311 and the second left shallow groove 312 are both Z-shaped. The connection end of the first left shallow groove 311 and the second left shallow groove 312 is the first inflection point of the left shallow groove 31, which is communicated with the adjacent main groove. The first left shallow groove 311 and the second left shallow groove 312 are provided with two polyline profiles beside the first inflection point. The two polyline profiles form a quadrilateral concave-convex groove 313 with the first left shallow groove 311 and the second left shallow groove 312.

[0034] The right rib 12 is provided with a plurality of right shallow grooves 32 communicated in sequence. The pattern formed by the right shallow grooves 32 is consistent with or symmetric with the pattern formed by the left shallow grooves 31.

[0035] The left shoulder rib 13 is provided with a plurality of left shoulder shallow grooves 33 arranged in the circumferential direction. One left shoulder shallow groove 33 is distributed in each pitch. The left shoulder shallow groove 33 is a two-segment polyline, the inner end of which is communicated with the first longitudinal main groove 21, and the outer end is located inside the left shoulder rib 13.

[0036] The right shoulder rib 14 is provided with a plurality of right shoulder shallow grooves 34 arranged in the circumferential direction. One right shoulder shallow groove 34 is distributed in each pitch. The profile of the right shoulder shallow groove 34 is centrally symmetric with the left shoulder shallow groove 33. The inner end of the right shoulder shallow groove 34 is communicated with the fourth longitudinal main groove 24, and the outer end is located inside the right shoulder rib 14.

[0037] Further, the main groove is a stepped groove, and the longitudinal section thereof is a T-shaped pattern groove, and a first stepped platform 25 is arranged on the inner side of the groove wall on both sides. The angle between the groove wall on both sides in the main groove and the vertical direction changes in a certain range, and the change range is 15-27°, so as to be wavy in plan view, and the opening angle of the main groove is 41-43°; the total groove depth of the main groove is 13.3-13.7 mm, the groove depth below the stepped platform 25 is 3.8-4.2 mm, and the groove width of the main groove is 13.3-13.7 mm; the width of the stepped platform 25 is 0.8-1.2 mm. The arrangement of the stepped platform 25 forms a “keystone angle”, cooperates with the centrifugal force direction of the T-shaped structure, can not only push out the stones, but also can shake out the impurities by the gradient width of the groove, and the self-cleaning efficiency is improved by more than 40% than that of the traditional straight groove.

[0038] Further, the longitudinal section of the middle shallow groove 30, the left shallow groove 31 and the right shallow groove 32 in the groove width direction is a U-shaped groove, the groove depth is 2.8-3.2 mm, and the groove width is 0.8-1.2 mm.

[0039] Further, the longitudinal section of the left shoulder shallow groove 33 and the right shoulder shallow groove 34 in the groove width direction is a U-shaped groove, the groove depth is 1.3-1.7 mm, and the groove width is 0.8-1.2 mm.

[0040] Further, the longitudinal section of the quadrilateral concave-convex groove 313 is sawtooth-shaped, the tooth depth is 0.35-0.45 mm, the tooth top width is 0.10-0.20 mm, the tooth bottom width is 0.50-0.70 mm, the tooth top spacing is 0.50-0.60 mm, and the tooth bottom spacing is 0.05-0.15 mm.

[0041] Further, the middle shallow groove 30 is a central symmetric figure, and the shallow groove between the first inflection point and the second inflection point has an angle of 40-42° with the horizontal.

[0042] Further, the left shallow groove 31 and the right shallow groove 32 are both symmetric figures, and the first inflection point is located in the middle of the pitch length direction.

[0043] Further, the two sections of the broken line profile arranged beside the first inflection point are perpendicular to the shallow grooves connected thereto, and the inflection points of the two sections of the broken line profile do not cross the middle line in the pitch width direction.

[0044] Further, the angle between the left shoulder shallow groove 33 and the right shoulder shallow groove 34 and the adjacent main groove is 43-47°.

[0045] Further, the inner end of the left shoulder shallow groove 33 and the inner end of the right shoulder shallow groove 34 in the same pitch are apart from each other by 1 / 2 of the pitch in the circumferential direction of the tire.

[0046] Further, the tread is provided with wing rubber 4, which extends to the edge of the main groove bottom and is at a distance d of 3.5mm≤d≤4.0mm from the middle line of the main groove bottom. The wing rubber 4 serves as a transition layer to balance the stress transmission between the tread and the sidewall, avoiding local stiffness mutation. At the same time, the wing rubber 4 extends moderately to the edge of the main groove bottom, increasing the thickness gradient of the rubber near the main groove bottom, while avoiding the main groove bottom, further buffering the local deformation, basically solving the problem of groove bottom cracking, and the incidence is reduced from 1.2% to 0.4%.

[0047] Further, a steel sheet can be arranged in the shallow groove. Embodiment

[0048] A full steel load radial tire, comprising a tread, Figure 1 The structure of the tread is shown in the unfolded state in the plane, and Figure 1 The pitch L and the pitch S of the lower half of the tread are also shown by dashed lines in the figure. The pitch of the tread includes 24 long pitches L and 28 short pitches S, arranged in the order of SLSSS-LSLSS-SLSLS-SLSSS-LSLSL-SLLLS-LSLLL-SLSLL-SLLLS-LSSSL-SS.

[0049] As shown in Figure 1 From left to right along the direction of the width of the tread, the intermediate rib 10, the left side rib 11, the right side rib 12, the left shoulder rib 13 and the right shoulder rib 14 extending in the circumferential direction of the tire are arranged in sequence. From left to right along the direction of the width of the tread, the first longitudinal main groove 21, the second longitudinal main groove 22, the third longitudinal main groove 23 and the fourth longitudinal main groove 24 extending in the circumferential direction of the tire are also arranged in sequence. The first longitudinal main groove 21 is arranged between the left side rib 11 and the left shoulder rib 13, the second longitudinal main groove 22 is arranged between the intermediate rib 10 and the left side rib 11, the third longitudinal main groove 23 is arranged between the intermediate rib 10 and the right side rib 12, and the fourth longitudinal main groove 24 is arranged between the right side rib 12 and the right shoulder rib 14.

[0050] The intermediate rib 10, the left side rib 11, the right side rib 12, the left shoulder rib 13 and the right shoulder rib 14 are respectively provided with shallow groove patterns. As can be observed from the figure, the overall tire pattern is asymmetric, and is mainly composed of large-area block patterns. Different patterns in different regions can bring different forces and performance to different parts of the tire.

[0051] A plurality of intermediate shallow grooves 30 are arranged in the circumferential direction in the intermediate rib 10, and the intermediate shallow grooves 30 are center-symmetrical patterns. The leading end right end of the intermediate shallow groove 30 is communicated with the third longitudinal main groove 23, the trailing end left end is communicated with the second longitudinal main groove 22, and the leading end is higher than the trailing end. The adjacent upper and lower two intermediate shallow grooves 30 divide the intermediate rib 10 into a plurality of pattern blocks. The intermediate shallow groove 30 is a zigzag type, and from top to bottom, the leading end to the trailing end includes a first inflection point, a second inflection point, a third inflection point and a fourth inflection point. The first inflection point is located at the starting end of the pitch, and the fourth inflection point is located inside the pitch. The fourth inflection point is 1 / 2 pitch away from the first inflection point. The first inflection point extends horizontally in the tread width direction and communicates with the third longitudinal main groove 23, and the fourth inflection point extends horizontally in the tread width direction and communicates with the second longitudinal main groove 22. The shallow groove between the first inflection point and the fourth inflection point is Z-shaped. The shallow groove between the first inflection point and the second inflection point of the intermediate shallow groove 30 has a horizontal included angle of 41°.

[0052] A plurality of left shallow grooves 31 are sequentially communicated in the left rib 11, that is, the leading and trailing ends of the left shallow groove 31 are located at the leading and trailing ends of a pitch, and the left shallow groove 31 and the left edge of the left rib 11 form a triangle, that is, the leading and trailing ends of the left shallow groove 31 are communicated with the first longitudinal main groove 21. The left shallow groove 31 includes a first left shallow groove 311 and a second left shallow groove 312 forming a triangle, the first left shallow groove 311 is located above the second left shallow groove 312, and the first left shallow groove 311 and the second left shallow groove 312 are both Z-shaped and symmetrically arranged above and below. The connecting end of the first left shallow groove 311 and the second left shallow groove 312 is the first inflection point of the left shallow groove 31, which is communicated with the second longitudinal main groove 22 and located at 1 / 2 pitch. Two sections of zigzag profiles are arranged between the first left shallow groove 311 and the second left shallow groove 312 beside the first inflection point, and the two sections of zigzag profiles form quadrilateral concave-convex grooves 313 with the first left shallow groove 311 and the second left shallow groove 312 respectively, and the two sections of zigzag profiles are perpendicular to the first left shallow groove 311 and the second left shallow groove 312 respectively. The inflection points of the two sections of zigzag profiles do not cross the middle line of the pitch width direction.

[0053] The pattern in the right rib 12 is consistent with the pattern in the left rib 11. The right rib 12 is provided with a plurality of right shallow grooves 32 in sequence, and the right shallow grooves 32 are consistent with the left shallow grooves 31 in profile, that is, the pattern formed by the plurality of right shallow grooves 32 is consistent with the pattern formed by the left shallow grooves 31 in profile. The first and last ends of the right shallow grooves 32 are located at the first and last ends of one pitch, respectively, and the right shallow grooves 32 and the left edge of the right rib 12 form a triangle, that is, the first and last ends of the right shallow grooves 32 are communicated with the third longitudinal main groove 23. The inflection point of the right shallow groove 32 is communicated with the fourth longitudinal main groove 24 and is located at 1 / 2 pitch. The inflection point of the right shallow groove 32 is also provided with two segments of fold line profile, and the two segments of fold line profile form a quadrilateral concave-convex groove 313 with the two parts of the shallow groove of the right shallow groove 32, respectively, and the two segments of fold line profile are perpendicular to the right shallow groove 32, and the inflection points of the two segments of fold line profile do not cross the middle line in the width direction of the pitch.

[0054] The left shoulder rib 13 is provided with a plurality of left shoulder shallow grooves 33 arranged in the circumferential direction, and one left shoulder shallow groove 33 is distributed in each pitch. The left shoulder shallow groove 33 is a two-segment fold line, the inner end of which is communicated with the first longitudinal main groove 21, and the outer end of which is located inside the left shoulder rib 13 and extends in the tire circumferential direction. The length of the left shoulder shallow groove 33 in the axial direction is not more than 1 / 2 pitch. The angle between the left shoulder shallow groove 33 and the first longitudinal main groove 21 is 45°.

[0055] The right shoulder rib 14 is provided with a plurality of right shoulder shallow grooves 34 arranged in the circumferential direction, and one right shoulder shallow groove 34 is distributed in each pitch. The profile of the right shoulder shallow groove 34 is centrally symmetrical to the left shoulder shallow groove 33, the inner end of the right shoulder shallow groove 34 is communicated with the fourth longitudinal main groove 24, and the outer end is located inside the right shoulder rib 14. The inner ends of the left shoulder shallow groove 33 and the right shoulder shallow groove 34 in the same pitch are 1 / 2 pitch apart in the circumferential direction of the tire. The angle between the right shoulder shallow groove 34 and the fourth longitudinal main groove 24 is 45°.

[0056] The first longitudinal main groove 21, the second longitudinal main groove 22, the third longitudinal main groove 23 and the fourth longitudinal main groove 24 are consistent in profile. As shown in Figure 2 , the main groove is a stepped groove, and the longitudinal section is a T-shaped pattern groove, and one-stage ladder 25 is arranged on the inner side of the two side walls. The angle between the two side walls inside the main groove and the vertical direction changes within 16°-26°, and the opening of the main groove is fixed at 42°; the total groove depth of the main groove is 13.5 mm, and the groove depth below the ladder 25 is 4.0 mm, the opening groove width of the main groove is 13.5 mm, and the groove bottom width is 2.5 mm; the width of the two ladders 25 is 1.0 mm, and the opening of the ladder 25 below is 26°.

[0057] As shown in Figure 3 , the longitudinal section of the middle shallow groove 30, the left shallow groove 31 and the right shallow groove 32 in the groove width direction is a U-shaped groove, the groove depth is 3.0 mm, and the groove width is 1.0 mm.

[0058] As shown in Figure 5 , the longitudinal section of the left shoulder shallow groove 33 and the right shoulder shallow groove 34 in the groove width direction is a U-shaped groove, the groove depth is 1.5 mm, and the groove width is 1.0 mm.

[0059] As shown in Figure 7 , the longitudinal section of the quadrilateral concave-convex groove 313 is zigzag-shaped, the tooth depth is 0.4 mm, the tooth top width is 0.15 mm, the tooth bottom width is 0.60 mm, the tooth top spacing is 0.55 mm, and the tooth bottom spacing is 0.10 mm.

[0060] As shown in Figure 1 , the tire also has wing rubber 4, which extends to the edge of the main groove bottom, and the distance from the wing rubber 4 to the middle line of the main groove bottom is 3.79 mm.

[0061] Comparative Example 1 The tire tread of this tire is not designed with patterns in the pattern ribs relative to Example 1, and the others are the same as the tire of Example 1.

[0062] Comparative Example 2 The tire tread of this tire is not designed with wing rubber relative to Example 1, and the others are the same as the tire of Example 1.

[0063] Comparative Example 3 The tire tread of this tire is designed with a U-shaped main groove relative to Example 1, and the others are the same as the tire of Example 1.

[0064] Tires with a size of 225 / 11R22.5 were prepared according to Example 1 and Comparative Examples 1-3, and real vehicle road tests were conducted under heavy load conditions: single axle load 11.5 t, driving 100,000 km, road conditions containing high speed + mountain slope, the occurrence rate of tread cracking of Example 1 relative to Comparative Example 1 was reduced by 76%; the occurrence rate of groove bottom cracking of Example 1 relative to Comparative Example 2 was reduced from 1.2% to 0.4%. The viscosity of the mud on the simulated muddy road was 1.2 Pa.s, and the residual mud amount of the main groove after the tire was rolled for 10 laps was tested, and the self-cleaning efficiency of Example 1 relative to Comparative Example 3 was improved by 42%.

[0065] The above describes the embodiments of the present application, and through the above description of the disclosed embodiments, those skilled in the art can implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A type of all-steel radial truck tire, characterized in that, The tire includes a tread, on which are provided a central rib (10), a left rib (11), a right rib (12), a left shoulder rib (13), and a right shoulder rib (14) extending along the tire circumference; the central rib (10) is located in the center of the tread, and side ribs and shoulder ribs are provided on the left and right sides of the central rib (10) from the inside out, respectively; the tire includes, from left to right, a first longitudinal main groove (21), a second longitudinal main groove (22), a third longitudinal main groove (23), and a fourth longitudinal main groove (24) extending along the tire circumference, and the above main grooves are distributed at intervals between the ribs; characterized in that, The tread is divided into several pitches along the tire circumference, including long pitch L and short pitch S. Shallow groove patterns are provided in the middle rib (10), left rib (11), right rib (12), left shoulder rib (13) and right shoulder rib (14). The middle rib (10) is provided with several shallow grooves (30) arranged in the circumferential direction. The two ends of the shallow grooves (30) are connected to the adjacent second longitudinal main groove (22) and third longitudinal main groove (23) respectively, and the two ends are higher and lower. The shallow grooves (30) are zigzag-shaped, including a first inflection point, a second inflection point, a third inflection point and a fourth inflection point from top to bottom. The first inflection point is located at the beginning end of the pitch, and the fourth inflection point is located inside the pitch. The first inflection point and the fourth inflection point extend horizontally in opposite directions and are connected to the adjacent main grooves. The shallow groove between the first inflection point and the fourth inflection point is Z-shaped. The left rib (11) is provided with a series of sequentially connected left shallow grooves (31). The left shallow grooves (31) and one side edge of the rib form a triangle, that is, the two ends of the left shallow grooves (31) are connected to the same main groove. The left shallow grooves (31) include a first left shallow groove (311) and a second left shallow groove (312) forming a triangle. The first left shallow groove (311) is located above the second left shallow groove (312). The first left shallow groove (311) and the second left shallow groove (312) are both Z-shaped. The connection end of the first left shallow groove (311) and the second left shallow groove (312) is the first inflection point of the left shallow groove (31). This inflection point is connected to the adjacent main groove. Two broken line contours are provided next to the first inflection point. These two broken line contours form a quadrilateral groove (313) with the first left shallow groove (311) and the second left shallow groove (312) respectively. The right rib (12) is provided with a series of sequentially connected right shallow grooves (32), and the pattern formed by the right shallow grooves (32) is consistent with or symmetrical to the pattern formed by the left shallow grooves (31). The left shoulder rib (13) is provided with several left shoulder shallow grooves (33) arranged in the circumferential direction, and one left shoulder shallow groove (33) is distributed in each pitch; the left shoulder shallow groove (33) is a two-segment broken line, the inner end of which is connected to the first longitudinal main groove (21) and the outer end is located inside the left shoulder rib (13); The right shoulder rib (14) is provided with several right shoulder shallow grooves (34) arranged in the circumferential direction, with one right shoulder shallow groove (34) distributed in each pitch; the outline of the right shoulder shallow groove (34) is symmetrical to the center of the left shoulder shallow groove (33), the inner end of the right shoulder shallow groove (34) is connected to the fourth longitudinal main groove (24), and the outer end is located inside the right shoulder rib (14).

2. The all-steel radial truck tire according to claim 1, characterized in that, The pitch includes 24 long pitches L and 28 short pitches S, arranged in the order SLSSS-LSLSS-SLSLS-SLSSS-LSLSL-SLLLS-LSLLL-SLSLL-SLLLS-LSSSL-SS.

3. The all-steel radial truck tire according to claim 1, characterized in that, The main groove is a stepped groove with a T-shaped patterned groove in its longitudinal section. A first-level step (25) is provided on the inner side of the groove wall on both sides. Preferably, the angle between the two groove walls that connect with the tread and the vertical direction in the main groove varies within a certain range, ranging from 15° to 27°, and the opening angle of the main groove is 41° to 43°. The total depth of the main groove is 13.3 to 13.7 mm, the groove depth below the step (25) is 3.8 to 4.2 mm, and the width of the main groove is 13.3 to 13.7 mm. More preferably, the width of the step (25) is 0.8 to 1.2 mm.

4. The all-steel radial truck tire according to claim 1, characterized in that, The longitudinal cross-section of the middle shallow ditch (30), the left shallow ditch (31), and the right shallow ditch (32) in the ditch width direction is a U-shaped ditch with a ditch depth of 2.8~3.2mm and a ditch width of 0.8~1.2mm.

5. The all-steel radial truck tire according to claim 1, characterized in that, The longitudinal cross-section of the left shoulder shallow groove (33) and the right shoulder shallow groove (34) in the groove width direction is a U-shaped groove with a groove depth of 1.3~1.7mm and a groove width of 0.8~1.2mm.

6. The all-steel radial truck tire according to claim 1, characterized in that, The longitudinal section of the quadrilateral groove (313) is sawtooth-shaped, with a tooth depth of 0.35~0.45mm, a tooth top width of 0.10~0.20mm, a tooth bottom width of 0.50~0.70mm, a tooth top spacing of 0.50~0.60mm, and a tooth bottom spacing of 0.05~0.15mm.

7. The all-steel radial truck tire according to claim 1, characterized in that, The shallow ditch (30) in the middle is a centrally symmetrical figure, and the angle between the shallow ditch and the horizontal between the first inflection point and the second inflection point is 40~42°.

8. The all-steel radial truck tire according to claim 1, characterized in that, The left shallow ditch (31) and the right shallow ditch (32) are both symmetrical figures, and their first inflection point is located in the middle of the length of the pitch. Preferably, the two broken-line contours set next to the first inflection point are perpendicular to the adjacent shallow grooves, and the inflection points of the two broken-line contours do not cross the midline in the direction of the pitch width.

9. The all-steel radial truck tire according to claim 1, characterized in that, The angle between the left shoulder shallow groove (33), the right shoulder shallow groove (34) and the adjacent main groove is 43~47°; Preferably, the inner ends of the left shoulder shallow groove (33) and the right shoulder shallow groove (34) within the same pitch are 1 / 2 pitch apart in the circumferential direction of the tire.

10. The all-steel radial truck tire according to claim 1, characterized in that, The tread is provided with wing rubber (4), which extends to the edge of the bottom of the main groove and is d at a distance of 3.5mm≤d≤4.0mm from the center line of the bottom of the main groove.

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