Special new energy vehicle tire with balanced high-mileage pattern structure

Abstract

The utility model relates to a special tire with a balanced high-mileage pattern structure for a new energy vehicle, and belongs to the field of tire design. Comprising a tread and tire shoulders, a longitudinal central pattern groove is circumferentially arranged along the center of the tread, the longitudinal central pattern groove adopts a pattern groove angle gradual change design mode, two longitudinal tire shoulder pattern grooves with the same structure are arranged on the left side and the right side by taking the longitudinal central pattern groove as the center, and the longitudinal central pattern groove and the longitudinal tire shoulder pattern grooves are of longitudinal zigzag groove type structures. Central pattern strips are distributed between the adjacent longitudinal central pattern grooves and the longitudinal tire shoulder pattern grooves along the circumferential direction; tire shoulder pattern strips are arranged in the circumferential direction of the tire shoulder, water-drop-shaped cuts which are distributed in the circumferential direction are respectively designed at the concave positions of the tire shoulder pattern strips on the inner sides of the tire shoulder pattern strips, the water-drop-shaped cuts are cuts with certain angles, and the water-drop-shaped cuts extend to a central pattern strip along the zigzag back-swinging direction of a longitudinal tire shoulder pattern groove to form a transverse groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to tire pattern design technical field, in detail is a kind of new energy vehicle special tire of balanced type high mileage pattern structure. BACKGROUND

[0002] Affected by battery endurance, electric heavy truck use scene mainly for sand and gravel transport tractor, city construction muck dump truck, city construction mixer, municipal sanitation special vehicle etc., one-way distance 300 kilometers, daily mileage 500 kilometers.

[0003] On the one hand, electric heavy truck drive mode changes into electric drive mode, electric drive starting moment torque is big, starting speed-up is fast, starting and advancing process tire and road occur violent sliding friction, and the requirement of anti-abnormal wear and driving performance to tire is higher;On the other hand, electric heavy truck use scene is mainly city and town road, and there are more road gravel and more curved road, and strong drive leads to the risk of tire stone clamping and groove cracking.

[0004] Therefore, how to solve the above problems, design new energy heavy truck special tire, avoid the problem of low wear and groove cracking caused by strong drive and use environment, is the problem that the person skilled in the art urgently needs to solve. SUMMARY

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a new energy vehicle special tire of balanced type high mileage pattern structure, which avoids the problem of low wear and groove cracking caused by strong drive and use environment.

[0006] The utility model solves the technical scheme that the technical scheme adopts: a new energy vehicle special tire of balanced type high mileage pattern structure, including tread, shoulder, its characterized in that, it is equipped with longitudinal center pattern groove along the center circumferential direction of tread, and two same structure longitudinal shoulder pattern grooves are arranged left and right with longitudinal center pattern groove as center, longitudinal center pattern groove and longitudinal shoulder pattern groove are longitudinal zigzag groove type structure, and center pattern strip is distributed along circumferential direction between adjacent longitudinal center pattern groove and longitudinal shoulder pattern groove;The circumferential direction of shoulder is provided with shoulder part pattern strip, wherein the inside shoulder part pattern strip recessed position of shoulder part pattern strip is designed with circumferential direction distribution '' water drop '' shape cutting, the '' water drop '' shape cutting is cutting with a certain angle, and the '' water drop '' shape cutting extends transverse groove along the zigzag return direction of longitudinal shoulder pattern groove to center pattern strip.

[0007] The cutting direction of the cutting with a certain angle is oblique cutting, the included angle α1 between the cutting direction and the '' water drop '' cutting direction of tire pattern circumferential direction A is 70-76 degrees, and the transverse distance L between the cutting top end side line and the shoulder part pattern strip recessed position is 5mm-10mm.

[0008] The transverse groove is of equal width and unequal depth design, and extends through the entire center pattern strip, the angle α2 between the extension direction of the transverse groove and the pattern circumferential direction A of the tire is 70-76 degrees, the ratio of the downward extension depth of the transverse groove along the tire surface to the depth of the longitudinal center pattern groove and the longitudinal shoulder pattern groove is 25%-50%, and the depth of the longitudinal center pattern groove and the longitudinal shoulder pattern groove is the same but the width and the zigzag angle are different.

[0009] The longitudinal center pattern groove adopts equal-angle zigzag design, and the angle β between the zigzag direction of the longitudinal center pattern groove and the pattern circumferential direction A of the tire is 22°-23.5°.

[0010] The longitudinal shoulder pattern groove adopts zigzag and swing design, the angle γ1 between the zigzag direction of the longitudinal shoulder pattern groove and the pattern circumferential direction A of the tire is 130°-140°, and the angle γ2 between the swing direction of the longitudinal shoulder pattern groove and the pattern circumferential direction A of the tire is 7°-9°.

[0011] The width of the longitudinal center pattern groove is 0.9-1.1 times the width of the longitudinal shoulder pattern groove, and the width of the shoulder pattern strip is 1.2-1.3 times the width of the center pattern strip.

[0012] The longitudinal center pattern groove and the longitudinal shoulder pattern groove are both provided with a stone discharging structure, and the relative ratio of the length, width and height of the stone discharging structure is 9:4:5.

[0013] The longitudinal center pattern groove adopts a gradual change in groove angle design.

[0014] A polygonal heat dissipation groove is equidistantly arranged along the circumferential direction of the shoulder pattern strip, the design of the heat dissipation groove is the same as the “water drop”-shaped cutting which is distributed on the inner and outer sides of the shoulder pattern strip and is staggered.

[0015] A transverse groove is designed along the circumferential direction of the center pattern strip, the transverse groove is of equal width and unequal depth structure, and the transverse groove cuts the center pattern strip into several independent units.

[0016] The circumferential lengths of the several independent units are different (lengths are divided into S, M and L), the widths of the transverse grooves contained in each independent unit are equal, and the ratio of the width of the transverse groove to the circumferential length of each independent unit in the independent units of S, M and L is 0.14, 0.13 and 0.12, respectively.

[0017] The several independent units are designed with “S”-shaped fine grooves and irregular knurling friction grooves, and the cross-sectional shape of the knurling friction groove structure is a continuous fine groove structure.

[0018] The utility model discloses beneficial effect is, can effectively prevent the occurrence of the disease of the crack and the eccentric wear, prevent the tire shoulder deformity wear, prolong the service life of tire. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model is further explained below in combination with the drawings and examples.

[0020] Figure 1 It is the structure schematic diagram of balanced type high mileage pattern in the utility model;

[0021] Figure 2 It is the three -dimensional schematic diagram of tire angle change pattern groove in the utility model;

[0022] Figure 3 It is the transverse B-B and longitudinal C-C section view of center pattern strip transverse groove;

[0023] Figure 4 It is the knurl friction groove section view;

[0024] Figure 5 It is the force diagram in the actual use of tire;

[0025] Figure 6 It is the change schematic diagram of stone subjection into pattern groove;

[0026] Figure 7 It is the section view of shoulder heat dissipation groove;

[0027] Figure 8 It is the longitudinal center pattern groove section view.

[0028] Fig. 1, longitudinal center pattern groove; 2, longitudinal shoulder pattern groove; 3, center pattern strip; 4, shoulder part pattern strip; 5, heat dissipation groove; 6, transverse groove; 7, knurl friction groove; 8, stone arrangement structure; 9, "water drop" shape cutting; 10, independent unit; 11, shoulder part pattern strip recessed position; 12, "S" shape fine groove; α1, the included angle of "water drop" cutting direction and tire pattern circumferential direction; α2, the included angle of transverse groove extension direction and circumferential line; β, the included angle of longitudinal center pattern groove zigzag direction and pattern circumferential angle; γ1, the included angle of longitudinal shoulder pattern groove zigzag direction and pattern circumferential line angle; γ2, the included angle of longitudinal shoulder pattern groove swing direction and pattern circumferential line angle; γ, knurl structure groove wall angle; W1, knurl friction groove protruding part width; W2, knurl friction groove recess width; a, knurl depth; β', longitudinal center pattern groove wall angle; H. pattern groove depth, h1. first section of transverse groove, h2. second section of transverse groove, A. tire pattern circumferential direction, R. groove bottom inverse radius, R2. groove bottom inverse radius, Δ. groove wall angle. DETAILED DESCRIPTION

[0029] Figure 1As shown, the three longitudinal zigzag grooves distributed along the circumference of the tread in the embodiment include a longitudinal center groove 1 arranged along the center circumference of the tread, and two longitudinal shoulder grooves 2 of the same structure arranged left and right of the longitudinal center groove 1, and the center groove 3 is distributed along the circumferential direction between the adjacent longitudinal center groove 1 and longitudinal shoulder groove 2; the circumferential shoulder part groove 4 is arranged on the shoulder, wherein the "water drop" shaped cut 9 is designed to be distributed along the circumferential direction at the concave position 11 of the shoulder part groove inside the shoulder part groove 4, the "water drop" shaped cut 9 is a cut with a certain angle, and the "water drop" shaped cut 9 extends along the zigzag return direction of the longitudinal shoulder groove 2 to the transverse groove 6 of the center groove 3.

[0030] In the use process, in addition to providing driving force, the tire will bear a combined force of a lateral force and a longitudinal force, the combined force has a certain angle with the rolling direction of the tire, and the force is shown in Figure 5 The combined force generated by the larger driving force of the new energy vehicle is much larger than that of the traditional fuel vehicle, and the tire is more prone to river-like wear. By adjusting the proportion of the pattern block and designing the "water drop" shaped cut 9 at the protruding position of the shoulder part groove, the rigidity of the shoulder pattern block is increased, and the "water drop" shaped cut reduces the stress concentration of the protruding and concave positions of the shoulder part groove. When the tire bears the "combined force", the river-like wear does not occur.

[0031] The two longitudinal shoulder grooves 2 have the same width and depth, the longitudinal shoulder groove 2 adopts a zigzag return design (i.e. large angle zigzag and small angle return), and the longitudinal center groove 1 adopts an equal amplitude zigzag design (i.e. the same zigzag angle on the left and right), and the rigidity of the shoulder groove and the center groove is effectively balanced by the different step zigzag designs of the longitudinal shoulder groove 2 and the longitudinal center groove 1.

[0032] The zigzag direction of the longitudinal center groove 1 and the longitudinal center groove zigzag direction of the tire pattern circumference A and the pattern circumference angle β are 22°-23.5°, the zigzag direction of the longitudinal shoulder groove 2 and the longitudinal shoulder groove zigzag direction of the tire pattern circumference A and the pattern circumference line angle γ1 are 130°-140°, and the return direction of the longitudinal shoulder groove 2 and the longitudinal shoulder groove return direction of the tire pattern circumference A and the pattern circumference line angle γ2 are 7°-9°.

[0033] The width of the longitudinal center groove 1 is 0.9-1.1 times the width of the longitudinal shoulder groove 2, and the width of the longitudinal shoulder part groove 4 is 1.2-1.3 times the width of the longitudinal center groove 3.

[0034] The "water drop" shaped oblique cutting has a cutting surface and a tire pattern circumferential direction A, that is, the included angle between the "water drop" cutting direction and the tire pattern circumferential direction is 70-76 degrees, and the transverse distance between the top edge line of the cutting surface and the concave position 11 of the shoulder pattern strip is 5-10 mm.

[0035] In the embodiment, the center pattern strip 3 is designed with a transverse groove 6 in the circumferential direction, which is of equal width and unequal depth structure, and the transverse groove cuts the center pattern strip 3 into a plurality of independent units 10 of unequal circumferential length; each independent unit 10 is designed with an "S" shaped fine groove 12 and an irregular knurled friction groove 7 structure, and the cross-sectional shape of the knurled friction groove 7 structure is a continuous fine groove structure.

[0036] The traction and braking forces during the use of the tire describe the forces transmitted between the tire and the road under various conditions, which are necessary conditions for the controlled steering, acceleration and braking of motor vehicles. If the upper limit of the friction force is exceeded, full slip, i.e. "slip" phenomenon, occurs. Once the tire slips, the friction with the road surface intensifies, which instantly causes the accumulation of heat in the tire. The accumulation of heat accelerates the wear of the tire on the one hand, and causes early damage to the tire on the other hand. Due to the driving mode, the instantaneous torque during the driving and braking of the tire of a new energy vehicle is large. Compared with the traditional fuel driving mode, the tire often exceeds the upper limit of the friction force, and the tire slips, i.e. the driving performance of the tire is insufficient, and the tire is rapidly worn and damaged early.

[0037] The longitudinal center pattern strip 3 is designed with a transverse groove 6 of equal width and unequal depth structure in the circumferential direction, and the detailed transverse and longitudinal sectional views are shown in Figure 3 The transverse groove 6 is of equal width and unequal depth design and penetrates through the entire center pattern strip 3, and the extension direction thereof and the tire pattern circumferential direction A, that is, the included angle between the extension direction of the transverse groove and the pattern circumferential direction is 70-76 degrees. The depth of the first section h1 of the transverse groove is 25%-35% of the pattern groove depth H, and the depth of the second section h2 of the transverse groove is 35%-50% of the pattern groove depth H. In the longitudinal sectional view, the radius of the arc bottom radius R is 2-2.5 mm.

[0038] The circumferential lengths of the plurality of independent units 10 are unequal (lengths are divided into S, M and L three types), the widths of the transverse grooves 6 contained in each unit are equal, and the proportions of the widths of the transverse grooves in the independent units of the three types of lengths S, M and L to the circumferential lengths of the independent units are 0.14, 0.13 and 0.12 respectively.

[0039] The independent unit 10 is designed with an "S" shaped fine groove 12 and an irregular knurled friction groove 7 structure, and the sectional view of the knurled friction groove 7 is shown in Figure 4The knurl structure groove wall angle γ is generally in the range of 4° to 6°, the knurl friction groove protruding part width W1 is generally in the range of 0.8 to 1.2 mm, the knurl friction groove groove width W2 is generally in the range of 1.0 to 1.5 mm, and the knurl depth a is in the range of 5% to 10% of the pattern groove depth H.

[0040] In the embodiment, the longitudinal center pattern groove 1 is designed with an angle gradually changing and a groove bottom stone discharging design, so as to prevent the pattern groove from clamping stones and the pattern groove bottom from being cracked due to the clamped stones.

[0041] Due to the endurance mileage limitation, the new energy vehicle is mainly used in urban and rural roads, and the vehicle will be frequently started and braked. Compared with the traditional fuel vehicle, the new energy vehicle is more likely to "squeeze into" the gravel during the friction with the ground, and the gravel will cut the groove bottom to cause the groove bottom to be cracked. If the gravel further squeezes into the belt layer, the belt layer will be abraded, thereby causing the tire to be damaged early.

[0042] Based on this, the applicant analyzes the reasons for the tire clamping stones: analyzing the actual occurrence of the stone clamped into the pattern groove with different depths (as shown in Figure 6 Due to the influence of the rubber properties, the pattern groove is generally designed with the same angle on both sides. After the stone is clamped, the stone will gradually extend to the pattern groove bottom along the direction of the pattern groove wall, and the rubber of the groove wall will be cut. The stone will be "stuck" in the pattern groove. With the extension of the tire use time, the pattern bar is repeatedly squeezed, the stone is clamped deeper and deeper, and finally the stone pierces the pattern groove bottom to directly reach the belt layer, causing the belt layer to be abraded and corroded, and finally causing the tire to be damaged.

[0043] The applicant confirms the reasons for the stone clamping and the reasons for the belt layer damage.

[0044] Firstly, the variable-angle pattern groove wall design is adopted (as shown in Figure 2 Unlike the common phenomenon of clamping stones in the equal-angle pattern groove, the variable-angle pattern groove wall is less likely to be clamped and deeply clamped due to the different forces of the stone and the two sides of the groove wall.

[0045] Secondly, the pattern groove bottom is designed with a "stone discharging platform". When the stone is clamped into the groove bottom and reaches the position of the stone discharging platform, the "stone discharging platform" rubber itself is used to block the stone from further clamping.

[0046] The longitudinal center pattern groove 1 is designed as an asymmetric U-shaped structure (as shown in Figure 8 The pattern groove wall is designed with a gradually changing angle in the circumferential direction, and the longitudinal center pattern groove wall angle β' is gradually changed in the range of 5° to 15°.

[0047] The longitudinal center groove 1 and the longitudinal shoulder groove 2 are each provided with a special stone discharging structure 8, the stone discharging structure 8 is uniformly arranged along the groove direction, and the size of the stone discharging structure 8 is in the ratio of 9:4:5.

[0048] In the embodiment, the polygonal heat dissipation grooves 5 are equidistantly arranged on the outer side of the shoulder part pattern strip 4 in the circumferential direction, and the heat dissipation grooves 5 have stress dispersion and heat dissipation functions.

[0049] In order to ensure the tire anti-distortion wear, the shoulder part pattern strip accounts for a large proportion, the rigidity of the tire is large during use, and the "edge breaking" and heat concentration problems are prone to occur, in order to avoid the occurrence of the problems, the polygonal heat dissipation grooves 5 are equidistantly arranged on the outer side of the shoulder part pattern strip 4 in the circumferential direction.

[0050] See Figure 7 The equal-depth stress dispersion groove is a "U" type structure, the stress dispersion groove depth ranges from 2 to 4 mm, the groove bottom reverse arc radius R2 ranges from 1 to 2 mm, and the groove wall angle Δ ranges from 3° to 5°.

[0051] The heat dissipation grooves 5 and the "water drop" shaped cuttings 9 are respectively distributed on the inner and outer sides of the shoulder part pattern strip 4 and are staggered.

[0052] The above-mentioned new energy vehicle special tire with balanced high mileage pattern structure fully considers the application scene of new energy vehicle tires, balances the relationship among the driving force, anti-distortion wear capacity and heat dissipation performance of the tire, meets the higher demand of new energy vehicles on tire performance, and has the following beneficial effects:

[0053] A longitudinal center groove 1 is arranged along the center of the tread in the circumferential direction, and two longitudinal shoulder grooves 2 of the same structure are arranged left and right around the longitudinal center groove 1, the longitudinal center groove 1 and the longitudinal shoulder grooves 2 are of longitudinal zigzag groove structure, the proportion of the groove and the pattern bar is optimized, which can effectively reduce the uneven distribution of rigidity caused by unreasonable proportioning and prevent the occurrence of shoulder abnormal wear. The design of different zigzag ways of the longitudinal center groove 1 and the longitudinal shoulder groove 2 can effectively coordinate the rigidity difference between the pattern bars, balance the stress distribution of the whole pattern and groove, and effectively prevent the occurrence of groove cracking and eccentric wear. By designing the circumferentially distributed "water drop" shaped cutting 9 with a certain angle at the concave position 11 of the shoulder pattern bar, and cooperating with the transverse groove 6 extending to the center pattern bar 3, the occurrence of river wear caused by large rigidity of the shoulder part during the sliding friction caused by large torque at the moment of vehicle starting can be effectively prevented. The zigzag groove cooperates with the optimized design proportion of the groove and the pattern bar, which ensures the uniform distribution of the crown rigidity, the uniform contact of the crown, and avoids the shoulder wear caused by uneven rigidity during the sliding friction caused by large torque at the moment of vehicle starting. By designing a plurality of continuous serrated knurled friction grooves 7 along the center pattern bar 3 in the circumferential direction of the tread, the problem of insufficient grip caused by large torque at the moment of starting is avoided, and the appearance of the tire is improved. Through the stone dislodging structure 8 and the groove angle design, the groove bottom crack caused by the special operation scene of the new energy vehicle is avoided to the greatest extent, and the service life of the tire is prolonged. The polygonal equal-depth heat dissipation groove 5 is designed at the lower part of the shoulder, which further optimizes the rigidity of the shoulder and reduces the heat generation caused by large torque at the moment of tire starting.

[0054] Through the design of the above various structures, the use characteristics of new energy vehicle tires are matched, the balance between the tire pattern structure and the anti-eccentric wear, anti-abnormal wear, grip performance and heat dissipation is considered, and the service life of new energy vehicle tires is improved.

Claims

1. A new energy vehicle tire dedicated to balanced high mileage pattern structure, comprising a tread, a shoulder, characterized in that, The longitudinal center groove is designed with a gradually changing groove angle, and two longitudinal shoulder grooves with the same structure are arranged on the left and right sides of the longitudinal center groove, the longitudinal center groove and the longitudinal shoulder groove are designed as a longitudinal zigzag groove, and the center groove is distributed between the adjacent longitudinal center groove and the longitudinal shoulder groove in the circumferential direction.

2. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The cutting direction of the oblique cutting and the "water drop" cutting direction of the tire pattern circumferential direction A form an angle α1 of 70-76 degrees, and the transverse distance L between the cutting top end line and the recessed position of the shoulder groove is 5-10 mm.

3. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The transverse groove is designed with equal width and unequal depth, and extends through the entire center groove, and the transverse groove extension direction and the groove circumferential direction A form an angle α2 of 70-76 degrees, and the downward extension depth of the transverse groove along the tire surface and the depth ratio of the circumferential longitudinal center groove and the longitudinal shoulder groove is 25%-50%, and the longitudinal center groove and the longitudinal shoulder groove have the same depth but different width and zigzag angle.

4. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The longitudinal center groove is designed with equal angle zigzag, and the zigzag direction and the longitudinal center groove zigzag direction of the tire pattern circumferential direction A form an angle β of 22°-23.5°.

5. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The longitudinal shoulder groove is designed with zigzag and swing, and the zigzag direction and the longitudinal shoulder groove zigzag direction of the tire pattern circumferential direction A form an angle γ1 of 130°-140°, and the swing direction and the longitudinal shoulder groove swing direction of the tire pattern circumferential direction A form an angle γ2 of 7°-9°.

6. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The longitudinal center groove width is 0.9-1.1 times the longitudinal shoulder groove width, and the shoulder groove width is 1.2-1.3 times the center groove width.

7. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The longitudinal center groove and the longitudinal shoulder groove are provided with a stone discharge structure, and the relative ratio of the length, width and height of the stone discharge structure is 9:4:

5.

8. A balanced high mileage pattern structure for new energy vehicle tyres according to claim 1, characterized in that The shoulder groove is provided with a polygonal heat dissipation groove, and the heat dissipation groove is designed to be distributed on the inner and outer sides of the shoulder groove and staggered.

9. A tyre, according to claim 1, characterised in that The center groove is designed with a transverse groove in the circumferential direction, and the transverse groove is designed with equal width and unequal depth, and the transverse groove cuts the center groove into several independent units.

10. A tyre, according to claim 9, characterized in that The circumferential length of the several independent units is divided into S, M and L three kinds, the width of the transverse groove contained in each independent unit is equal, the proportion of the width of the transverse groove in the independent units of S, M and L three lengths to the circumferential length of each independent unit is respectively 0.14, 0.13 and 0.12; the independent unit is designed with "S" shape fine groove matched with irregular knurl friction groove, the cross section shape of the knurl friction groove structure is continuous fine groove structure.

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