CN210257863U - Tread structure of bicycle tire for snowfield - Google Patents

Abstract

The utility model discloses a bicycle tire tread structure is used on snowfield, its tread is by a plurality of first horizontal lines group and the horizontal lines group of second along circumference interval distribution, and first horizontal lines group all is the decorative pattern piece of concave shape in the front and back end, and the horizontal lines group of second all is the decorative pattern piece of convex shape in the front and back end, the axial total width of first horizontal lines group is less than the axial total width of the horizontal lines group of second, and the multiplicable marginal effect of wide, narrow spaced double-shoulder promotes the ground nature of grabbing when turning. The strength of the pattern block is ensured by optimizing the structural design of the tread pattern, and the reduction of durability caused by insufficient rigidity is avoided. The surface of each pattern block is provided with a cutter groove and a snow nail, and the biting edges of each pattern block on the tread on the ice and snow road surface can be greatly increased through the matching design of the cutter groove and the snow nail, so that the anti-skid, ground grabbing and traction performances are improved.

Description

Tread structure of bicycle tire for snowfield

Technical Field

The utility model relates to a pneumatic tire especially indicates a bicycle tire tread structure for snowfield.

Background

The mountain bike riding on snowfield is the main sport of outdoor leisure and body building in winter, the road surface is usually covered with wet and slippery ice or soft snow in winter, the skid resistance, the ground grabbing performance and the traction performance of the existing bike tire patterns are not enough, the leisure and body building pleasure of consumers is influenced, and the traffic difficulty or the risk of falling can be caused. The existing snow bicycle is usually matched with mountain tire granular patterns, in order to improve the skid resistance, the ground gripping performance and the traction performance of the tire surface on the ice and snow ground, the surface of the mountain tire granular pattern is usually and directly provided with sipes or snow-embedded nails, but the land of the mountain tire granular pattern is lower, and pattern blocks are usually irregular polygons, although the surface of the pattern is directly provided with the sipes or the snow-embedded nails, the improvement effect is certain, if the surfaces of the pattern blocks are provided with dense sipes, the rigidity of the pattern blocks is reduced, the durability of the tire is reduced, if a single sipe is arranged, the edge effect is not sufficiently increased, and the improvement on the skid resistance and the ground gripping performance is not obvious. The surface of the pattern block is embedded with snow nails, so that stress concentration is easy to generate, and particularly for granular patterns with relatively small volume, cracks or fractures are easy to generate in severe cold winter, and the durability is also influenced. In addition, because the tread width of the bicycle tire is narrow and the profile of the cross section is smooth, except for the situation of large-angle bending, the grounding frequency of the pattern blocks at the tire shoulder part is low, so that the grounding area and the edge effect are insufficient during the turning, and the antiskid and ground gripping performance is not good particularly during the turning running on smooth ice surfaces and soft snowfields, thereby often causing the difficulty in passing or the danger of falling. Therefore, a need exists for a new tire tread pattern structure for a snowy riding bicycle, which can improve the skid resistance, the grip performance and the traction performance on snowy and icy ground (during use) and ensure the durability of the tire.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough and provide a can promote snow and ice ground antiskid, grab ground and traction performance with bicycle tire tread structure, ensure the durability of tire.

In order to achieve the above purpose, the solution of the present invention is:

a tread structure of a bicycle tire for snow is characterized in that a plurality of transverse pattern groups are distributed at intervals in the circumferential direction, pattern blocks on two sides of the tread are symmetrically distributed along the center line of the tread, each transverse pattern group comprises a first transverse pattern group and a second transverse pattern group, each first transverse pattern group comprises a first central pattern block positioned on the center line of the tread and two first shoulder pattern blocks symmetrical along the center line of the tread, and each first central pattern block and each first shoulder pattern block are pattern blocks in a shape of a middle concave in the front end and each second shoulder pattern block in the rear end, namely the middle of the front end and the rear end of each pattern block are inwards concave, and the two outer ends of each pattern block are outwards convex; the second transverse pattern group comprises a second central pattern block positioned on the central line of the tread and two second shoulder pattern blocks symmetrical along the central line of the tread, the second central pattern block and the two second shoulder pattern blocks are both convex pattern blocks at the front end and the rear end, namely the middle parts of the front end and the rear end of the pattern blocks are convex outwards, and the two outer ends are concave inwards, the land ratio of the whole tread is set to be 35-45%, and the axial total width of the first transverse pattern group is smaller than the axial total width of the second transverse pattern group.

Further, the first transverse pattern group has an axial total width of 80% to 95% of an axial total width of the second transverse pattern group.

Furthermore, the first central pattern block is formed by combining a first left pattern block and a first right pattern block which are symmetrical along the central line of the tread and a first connecting block for connecting the first left pattern block and the first right pattern block, the first left pattern block and the first right pattern block are symmetrical trapezoids, the circumferential width of the inner ends of the first left pattern block and the first right pattern block is smaller than that of the outer ends of the first left pattern block and the first right pattern block, and the front end and the rear end of the first central pattern block are in a concave shape; the central circumferential width of the first shoulder pattern block is smaller than the circumferential widths of the inner end and the outer end, so that the front end and the rear end of the first shoulder pattern block are in a concave shape; the central circumferential width of the second central pattern block is greater than the circumferential widths of the two outer ends, so that the front end and the rear end of the second central pattern block are in a convex shape; the second shoulder pattern block is formed by combining a second left pattern block, a second right pattern block and a second connecting block for connecting the second left pattern block and the second right pattern block, the second left pattern block and the second right pattern block are trapezoidal, the second left pattern block and the second right pattern block are opposite and staggered, the circumferential width of the outer end of the second left pattern block and the second right pattern block is smaller than that of the inner end of the second left pattern block and the second right pattern block, and the front end and the rear end of the second shoulder pattern block are in a convex shape.

Further, the inner end circumferential width of the first left pattern block and the first right pattern block is 75% -90% of the outer end circumferential width, the center circumferential width of the first shoulder pattern block is 75% -90% of the inner end circumferential width and the outer end circumferential width, and the two outer end circumferential widths of the second central pattern block are 75% -90% of the center circumferential width; the outer end circumferential width of the second left pattern block and the second right pattern block is 75-90% of the inner end circumferential width.

Further, the height of the first connecting block is set to be 20% -50% of the height of the first central pattern block, and the height of the second connecting block is set to be 20% -50% of the height of the second shoulder pattern block.

Furthermore, the surfaces of a first left pattern block and a first right pattern block of the first central pattern block are respectively provided with an X-shaped cutter groove, the surface of a first shoulder pattern block is provided with a transverse cutter groove, the surface of a second central pattern block is provided with a transverse cutter groove, the surface of a second right pattern block is provided with a transverse cutter groove, and the X-shaped cutter grooves are respectively close to the inner ends of the first left pattern block and the first right pattern block.

Furthermore, step edges are designed at the left end and the right end of the second central pattern block, height difference exists between the left end and the right end of the second central pattern block due to the step edges, and the height difference is designed to be 50% -80% of the height of the second central pattern block.

Furthermore, snow nails are arranged at the positions, close to the outer ends, of the first left pattern block and the first right pattern block of the first central pattern block, snow nails are arranged at the geometric center positions of the first shoulder pattern block and the second left pattern block respectively, and the snow nails protrude out of the surfaces of the pattern blocks.

Furthermore, the height of the first tire shoulder pattern block positioned at the tire shoulder and/or the second right pattern block of the second tire shoulder pattern block is a heightened design, and the heightened pattern block height is 0.5 mm-2.0 mm greater than the rest pattern blocks of the tire tread.

Furthermore, the heightened pattern block surface is an inwards concave arc surface.

After the structure of the utility model is adopted, the utility model discloses snowfield is with bicycle tire's tread is by a plurality of first horizontal decorative pattern group and the horizontal decorative pattern group of second along circumference interval distribution, first horizontal decorative pattern group all is the decorative pattern piece of concave shape in the front and back end, the horizontal decorative pattern group of second all is the decorative pattern piece of convex shape in the front and back end, the axial total width of the horizontal decorative pattern group of second that first horizontal decorative pattern group axial total width is 80% ~ 95%, and is wide, the multiplicable marginal effect of narrow spaced double-shoulder, ground nature of grabbing when promoting the turn. The land ratio of the whole tread is set to be 35% -45%, the first center pattern block and the second tire shoulder pattern block are two trapezoidal combined pattern blocks, the first tire shoulder pattern block and the second tire shoulder pattern block are thick and approximately square-shaped, the ratio of the circumferential width of the inner end to the circumferential width of the outer end is limited, the amplitude of the middle concave or the middle convex of each pattern block is controlled, the strength of the pattern blocks is ensured by optimizing the pattern structure design of the tread, and the reduction of durability caused by insufficient rigidity is avoided. The surface of each pattern block is provided with a cutter groove and a snow nail, and the biting edges of each pattern block on the tread on the ice and snow road surface can be greatly increased through the matching design of the cutter groove and the snow nail, so that the anti-skid, ground grabbing and traction performances are improved. The height of the second right pattern block of the first tire shoulder pattern block and/or the second tire shoulder pattern block is increased to 0.5-2.0 mm, and the surface of the increased pattern block is designed to be an inward concave arc surface, so that the skid resistance, the ground gripping performance and the traction performance of soft snow on a smooth ice surface are further improved.

Drawings

Fig. 1 is a schematic view of a tread pattern structure of a first embodiment of the tire of the present invention;

FIG. 2 is a cross-sectional view of E-E' of FIG. 1;

FIG. 3 is a schematic view of the first center block 10 of the present invention;

fig. 4 is a schematic view of the first shoulder block 20 of the present invention;

FIG. 5 is a schematic view of a second center block 30 of the present invention;

FIG. 6 is a schematic view of a second shoulder block 40 of the present invention;

fig. 7 is a schematic structural view of a tread pattern of a second embodiment of the tire of the present invention;

FIG. 8 is a sectional view taken along line F-F' in FIG. 7;

fig. 9 is a partial enlarged view of the tread 1 of fig. 8.

Description of reference numerals:

the tread 1 comprises a first lug group A and a second lug group B

First center block 10 first shoulder block 20 second center block 30

Second shoulder block 40 first left block 11 first right block 12

First connecting block 13, second left block 41, second right block 42

The second link block 43 sipes 10a, 20a, 30a, 40a snow nails C.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.

As shown in fig. 1 to 9, the present invention discloses a tread structure of a snow bicycle tire. In fig. 1, the vertical direction is set to the tire circumferential direction, the lateral direction is set to the tire axial direction, and CL denotes a tread center line; in fig. 2, the vertical direction is set to the tire radial direction, the lateral direction is set to the tire axial direction, and the single-dot chain line indicates the equatorial plane. The end of the block near the tread centerline CL represents the inner end and the end of the block away from the tread centerline CL represents the outer end. Furthermore, the terms "first," "second," and the like, are used merely to describe a feature and are not to be construed as indicating or implying a quantity of that feature.

As shown in fig. 1 the utility model provides a tire tread pattern structure sketch map, tire tread 1 is by a plurality of horizontal decorative pattern group along circumference interval distribution, the decorative pattern piece of tread 1 both sides is along tread central line CL symmetric distribution, horizontal decorative pattern group contains first horizontal decorative pattern group A and second horizontal decorative pattern group B, wherein first horizontal decorative pattern group A has contained the first central pattern piece 10 that is located on tread central line CL and two first shoulder decorative pattern pieces 20 along tread central line CL symmetry, first central pattern piece 10 and two first shoulder decorative pattern pieces 20 all are the decorative pattern piece of front and back end well concave shape, the middle part of decorative pattern piece front and back end is to the indent promptly, the shape of two outer ends evaginations. The second lug group B includes a second center lug 30 located on the tread centerline CL and two second shoulder lugs 40 symmetrical along the tread centerline CL, and the second center lug 30 and the two second shoulder lugs 40 are both convex lugs in the front and rear ends, that is, the front and rear ends of the lugs are convex in the middle and concave in the outer ends. In order to improve the grip and the grip on the tire during cornering, the total axial width OW1 of the first lug group a is smaller than the total axial width OW2 of the second lug group B, preferably: the total axial width OW1 of the first lug group A is 80-95% of the total axial width OW2 of the second lug group B. By adopting the design of the double shoulders with wide and narrow intervals, the edge effect at the shoulder is increased, and the ground gripping performance of turning is improved. Meanwhile, considering that the pattern blocks on the tread 1 need to avoid the phenomenon that the durability is reduced due to insufficient rigidity and the pattern blocks are caused to creep and deform properly, and the good effect of cutting into the snow is achieved, the land ratio of the whole tread 1 is set to be 35% -45% (taking the area of the tread 1 as the total area, the sum of the surface areas of the pattern blocks as the land area, and the land ratio refers to the ratio of the land area to the total area).

The first central pattern block 10 and the second shoulder pattern block 40 on the tread 1 are two trapezoidal combined pattern blocks, and the first shoulder pattern block 20 and the second central pattern block 30 are thick and approximate to a square design, and are shown in specific combination with fig. 2 to 6: the first center block 10 is formed by combining a first left block 11, a first right block 12 and a first connecting block 13 connecting the first left block 11 and the first right block 12, which are symmetrical along a tread center line CL, the first left block 11 and the first right block 12 are symmetrical trapezoids, and because the inner end circumferential width W1 of the first left block 11 and the first right block 12 is smaller than the outer end circumferential width W2, the front end and the rear end of the first center block 10 are in a concave shape, preferably: the inner end circumferential width W1 is 75% to 90% of the outer end circumferential width W2. The central circumferential width W3 of the first shoulder block 20 is smaller than the inner and outer end circumferential widths W4, so that the front and rear ends of the first shoulder block 20 are concave-convex, preferably: the central circumferential width W3 is 75% -90% of the inner and outer end circumferential widths W4. The second center block 30 has a center circumferential width W5 greater than both outer end circumferential widths W6, giving the second center block 30a convex front-rear end, preferably: the circumferential width W6 of the two outer ends is 75-90% of the central circumferential width W5. The second shoulder pattern block 40 is formed by the combination of the second left pattern block 41, the second right pattern block 42 and the second connecting block 43 connecting the second left pattern block 41 and the second right pattern block 42, the second left pattern block 41 and the second right pattern block 42 are trapezoids which are opposite to each other, and the staggered design can increase the axial edge effect, because the outer end circumferential width W8 of the second left pattern block 41 and the second right pattern block 42 is less than the inner end circumferential width W7, the front end and the rear end of the second shoulder pattern block 40 are in a convex shape, preferably: the outer end circumferential width W8 is 75% to 90% of the inner end circumferential width W7. For the sake of convenience of distinction, the hatched portions in fig. 2, 3 and 6 represent the first connecting block 13 and the second connecting block 43, and the height H1 of the first connecting block 13 and the second connecting block 43 is set to be 20% to 50% of the height H1 of the first center block 10 and the second shoulder block 40, so that the overall strength of the blocks can be properly strengthened, and the rigidity of the tread center and the shoulder position can be ensured. By the design, the first central pattern block 10 and the second central pattern block 30 on the central line CL of the tread are in concave-convex alternation, the first shoulder pattern block 20 and the second shoulder pattern block 40 on the shoulder position are in concave-convex alternation, the whole tread 1 increases more edge effects, forms shearing force in different directions, and helps to quickly cut into ice and snow, thereby increasing the biting edge on the ice and snow road surface; meanwhile, the ratio of the circumferential width of the inner end and the outer end of each pattern block is limited, the amplitude of the concave or convex in each pattern block is controlled, the edge effect is increased, the strength of the pattern block is ensured, and the risk of durability reduction caused by insufficient rigidity is reduced.

Fig. 7 and 8 show a second embodiment of the tread pattern structure of the tire of the present invention, in order to further increase the edge effect, the upper pattern block of the tread 1 properly forms a creep deformation, and improves the anti-skid property and the grip property of the tread 1, and sipes of various shapes are respectively disposed on the surfaces of the first transverse pattern group a and the second transverse pattern group B. Specifically, the method comprises the following steps: the surfaces of the first left block 11 and the first right block 12 of the first center block 10 are respectively provided with an X-shaped sipe 10a, the surface of the first shoulder block 20 is provided with a transverse sipe 20a, the surface of the second center block 30 is provided with a transverse sipe 30a, and the surface of the second right block 42 of the second shoulder block 40 is provided with a transverse sipe 40 a. The X-shaped sipes 10a are respectively close to the inner ends of the first left and right pattern blocks 11 and 12, so that edge effects in multiple directions are increased, and biting edges of the ice and snow road surface are increased. In addition, the left and right ends of the second center block 30 are designed with the step edges 31, the step edges 31 make the left and right ends of the second center block 30 have a height difference H2, the height difference H2 is designed to be 50% -80% of the height H1 of the second center block 30, if the height difference H2 is too small, the difference between the surface of the step edge 31 and the surface of the second center block 30 is too small, and the radial deformation difference generated during ground contact is too small or not obvious, so that the effects of improving ground contact and traction cannot be achieved. In order to further improve the gripping performance of the tire on snow and ice, particularly on a slightly thick ice and snow road surface, snow nails C are additionally arranged on the surface of the pattern blocks of the tread 1, the snow nails C protrude out of the surface of the pattern blocks, and sharp nail edges can break ice, snow and water films. Specifically, the method comprises the following steps: the first left block 11 and the first right block 12 of the first center block 10 are added with the snow nails C near the outer end positions, and the snow nails C are respectively added at the geometric center positions of the second left blocks 41 of the first shoulder block 20 and the second shoulder block 40. Through the matching design of the surface cutter grooves and the snow nails C of each pattern block, the biting edges of each pattern block of the tread 1 on the ice and snow road surface can be greatly increased, the anti-skid, ground-grabbing and traction performances are improved, and the tire can safely run on smooth ice and soft snow.

As shown in fig. 9, in order to further improve the skid resistance and the grip performance during cornering, and increase the cornering ground contact area and the edge effect, the height H2 of the first shoulder block 20 and/or the second right block 42 of the second shoulder block 20 at the shoulder is designed to be increased (in the present embodiment, the first shoulder block 20 is designed to be increased), and the height H2 of the first shoulder block 20 is greater than the height H1 of the remaining blocks on the tread 1. Preferably: h2 is preferably larger than H1 by about 0.5 mm-2.0 mm, and if the height H2 of the first shoulder pattern block 20 is too small larger than the height H1 of the rest pattern blocks on the tread 1, the turning ground-contact area and the edge effect cannot be effectively increased; on the other hand, if the height H2 of the first shoulder block 20 is too large compared to the remaining block height H1 of the tread 1, the first shoulder block 20 is easily worn, and the snow nails C on the surface thereof are easily dropped, and the durability is rather deteriorated. In addition, the surface 21 of the raised first shoulder pattern block 20 is designed to be a concave arc surface R, so that the edge of the surface 21 of the first shoulder pattern block 20 is sharply grounded, buffering deformation can be formed during cornering ground contact, and the skid resistance and the ground gripping performance of a smooth ice surface and the traction performance of a soft snow ground are improved.

To sum up, the utility model discloses an optimize tread decorative pattern structural design: the tread 1 is formed by a plurality of first transverse pattern groups A and second transverse pattern groups B which are distributed at intervals along the circumferential direction, the first transverse pattern groups A are all pattern blocks with middle concave shapes at the front end and the rear end, the second transverse pattern groups B are all pattern blocks with middle convex shapes at the front end and the rear end, the axial total width OW1 of the first transverse pattern groups A is 80% -95% of the axial total width OW2 of the second transverse pattern groups B, the edge effect can be increased by the aid of double shoulders with wide and narrow intervals, and the grip performance during turning is improved. The land ratio of the whole tread is set to be 35-45%, the first center pattern block 10 and the second shoulder pattern block 40 on the tread 1 are two trapezoidal combined pattern blocks, the first shoulder pattern block 20 and the second center pattern block 30 are thick and approximately square-shaped, the strength of the pattern blocks is ensured, the ratio of the circumferential width of the inner end and the circumferential width of the outer end is limited, the concave or convex amplitude of each pattern block is controlled, and the reduction of durability caused by insufficient rigidity is avoided. The surface of each pattern block is respectively provided with a cutter groove and a snow nail C, and the biting edges of each pattern block of the tread 1 on the ice and snow road surface can be greatly increased through the matching design of the cutter groove and the snow nail C, so that the anti-skid, ground grabbing and traction performances are improved. The height H2 of the second right pattern block 42 of the first shoulder pattern block 20 and/or the second shoulder pattern block 20 is designed to be increased, the increased height is set to be 0.5 mm-2.0 mm, the surface of the increased pattern block is designed to be an inward concave arc surface R, and the skid resistance, the ground gripping performance and the traction performance of soft snow on smooth ice surfaces are further improved.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.

Claims (10)

1. A snow bicycle tire tread structure, its characterized in that: the tread is distributed by a plurality of transverse pattern groups at intervals along the circumferential direction, pattern blocks on two sides of the tread are symmetrically distributed along the central line of the tread, each transverse pattern group comprises a first transverse pattern group and a second transverse pattern group, each first transverse pattern group comprises a first central pattern block positioned on the central line of the tread and two first shoulder pattern blocks symmetrical along the central line of the tread, and each first central pattern block and each first shoulder pattern block are pattern blocks in a shape of a middle concave shape at the front end and the rear end, namely the middle parts of the front end and the rear end of each pattern block are inwards concave, and the two outer ends of each pattern block are outwards convex; the second transverse pattern group comprises a second central pattern block positioned on the central line of the tread and two second shoulder pattern blocks symmetrical along the central line of the tread, the second central pattern block and the two second shoulder pattern blocks are both convex pattern blocks at the front end and the rear end, namely the middle parts of the front end and the rear end of the pattern blocks are convex outwards, and the two outer ends are concave inwards, the land ratio of the whole tread is set to be 35-45%, and the axial total width of the first transverse pattern group is smaller than the axial total width of the second transverse pattern group.

2. A snow bicycle tire tread structure as in claim 1, wherein: the first transverse pattern group has an axial total width of 80-95% of an axial total width of the second transverse pattern group.

3. A snow bicycle tire tread structure as in claim 1, wherein: the first central pattern block is formed by combining a first left pattern block, a first right pattern block and a first connecting block, wherein the first left pattern block and the first right pattern block are symmetrical along the central line of the tread, the first connecting block is used for connecting the first left pattern block and the first right pattern block, the first left pattern block and the first right pattern block are symmetrical trapezoids, the circumferential width of the inner ends of the first left pattern block and the first right pattern block is smaller than that of the outer ends of the first left pattern block and the first right pattern block, and the front end and the rear end of the first central; the central circumferential width of the first shoulder pattern block is smaller than the circumferential widths of the inner end and the outer end, so that the front end and the rear end of the first shoulder pattern block are in a concave shape; the central circumferential width of the second central pattern block is greater than the circumferential widths of the two outer ends, so that the front end and the rear end of the second central pattern block are in a convex shape; the second shoulder pattern block is formed by combining a second left pattern block, a second right pattern block and a second connecting block for connecting the second left pattern block and the second right pattern block, the second left pattern block and the second right pattern block are trapezoidal, the second left pattern block and the second right pattern block are opposite and staggered, the circumferential width of the outer end of the second left pattern block and the second right pattern block is smaller than that of the inner end of the second left pattern block and the second right pattern block, and the front end and the rear end of the second shoulder pattern block are in a convex shape.

4. The snowmobile tire tread structure of claim 3, wherein: the inner end circumferential widths of the first left pattern block and the first right pattern block are 75% -90% of the outer end circumferential width, the central circumferential width of the first shoulder pattern block is 75% -90% of the inner end circumferential width and the outer end circumferential width, and the two outer end circumferential widths of the second central pattern block are 75% -90% of the central circumferential width; the outer end circumferential width of the second left pattern block and the second right pattern block is 75-90% of the inner end circumferential width.

5. The snow bicycle tire tread structure according to claim 3 or 4, wherein: the height of the first connecting block is set to be 20% -50% of the height of the first central pattern block, and the height of the second connecting block is set to be 20% -50% of the height of the second shoulder pattern block.

6. The snowmobile tire tread structure of claim 3, wherein: the surface of a first left pattern block and the surface of a first right pattern block of the first central pattern block are respectively provided with an X-shaped cutter groove, the surface of a first shoulder pattern block is provided with a transverse cutter groove, the surface of a second central pattern block is provided with a transverse cutter groove, the surface of a second right pattern block is provided with a transverse cutter groove, and the X-shaped cutter grooves are respectively close to the inner ends of the first left pattern block and the first right pattern block.

7. The snowmobile tire tread structure of claim 3, wherein: the left end and the right end of the second central pattern block are provided with stepped edges, the stepped edges enable the left end and the right end of the second central pattern block to have height difference, and the height difference is designed to be 50% -80% of the height of the second central pattern block.

8. The snowmobile tire tread structure of claim 3, wherein: snow nails are arranged at positions, close to the outer ends, of the first left pattern block and the first right pattern block of the first central pattern block, snow nails are arranged at geometric center positions of the first shoulder pattern block and the second left pattern block respectively, and the snow nails protrude on the surfaces of the pattern blocks.

9. A snow bicycle tire tread structure as in claim 1, wherein: the height of the first tire shoulder pattern block positioned at the tire shoulder and/or the second right pattern block of the second tire shoulder pattern block is a heightened design, and the heightened pattern block height is 0.5 mm-2.0 mm greater than the rest pattern blocks of the tire tread.

10. The snowmobile tire tread structure of claim 9, wherein: the heightened pattern block surface is an inward-concave arc surface.

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