Low-rolling-resistance tire

Abstract

The utility model provides a tire with low rolling resistance, which belongs to the technical field of tires and comprises a tread, a tire body and a belted layer arranged between the tread and the tire body, a central pattern groove extending along the circumferential direction of the tire is arranged in the middle area of the tread, and a plurality of transverse pattern grooves are arranged in tire shoulder areas on two sides of the tread. And the depth H1 of the transverse pattern grooves and the depth H2 of the central pattern grooves meet the equation that H2-H1 is equal to 2-3mm. The low-rolling-resistance tire has the characteristics that the weight of the tire is reduced, the rolling resistance is reduced, the heat dissipation is improved, the ageing resistance is improved, and the service life of the tire is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tire technical field especially relates to a low rolling resistance tire. BACKGROUND

[0002] With the continuous improvement of energy saving and environmental protection and tire durability requirements of the automobile industry, reducing rolling resistance and prolonging service life become important technical indicators of tires. As a key indicator of measuring tire energy consumption, rolling resistance is mainly affected by the structure of the crown, the structure of the sidewall and the weight of the tire. And the heavier the tire with the same structure, the greater the rolling resistance. The aging resistance is one of the important factors affecting the service life of the tire.

[0003] In actual use, the tread is the only component of the tire that contacts the ground, and the friction between the tire and the ground generates heat, which causes the rubber to soften, the rigidity to decrease, and the friction coefficient to increase, thereby increasing the rolling resistance. Early tire failure is mainly manifested as tread bulging, mainly because the tire is made by sequentially bonding multiple semi-components on a forming drum. The hardness, Mooney and modulus of the rubber material are different due to the different formulations and skeleton materials of the semi-components, thereby causing different deformations of the finished tire at different positions under the same stress, which will cause cracking and bulging at different positions due to different deformations after long-term use.

[0004] However, it is difficult to achieve the above-mentioned performance balance of the tire through single structure optimization in the prior art, therefore, how to obtain a low rolling resistance tire through optimizing the structure design has become a technical problem to be solved at present. SUMMARY

[0005] The details of one or more embodiments of the utility model are presented in the following drawings and description, so that other features, objects and advantages of the present application are more concise and easy to understand.

[0006] The utility model provides a kind of low rolling resistance tire, solve the technical problem that the rolling resistance and aging resistance balance of tire of prior art through single structure optimization are difficult to realize, with reduce tire weight, reduce rolling resistance, improve heat dissipation, improve aging resistance, prolong the service life of tire The characteristics of.

[0007] The utility model discloses a kind of low rolling resistance tire, including tread, carcass and the belt layer being set between tread and carcass, wherein, the center pattern groove along the circumferential direction of tire is set in the middle region of tread, a plurality of transverse pattern grooves are set in the shoulder region of both sides of tread, and the groove depth H1 of transverse pattern groove and the groove depth H2 of center pattern groove satisfy H2-H1=2~3mm.

[0008] In some embodiments, the belt layer includes a first belt layer and a second belt layer that are sequentially bonded from bottom to top, wherein both ends of the second belt layer are covered with edge-sealing films, the thickness of which is 0.4 to 0.6 mm and the width of which is 15 to 25 mm.

[0009] In some embodiments, an inner liner is also included, disposed inside the tire body, and the inner liner has a thickness of 1.2 to 1.4 mm.

[0010] In some embodiments, inner liner strips are symmetrically arranged on the inner side of the inner liner layer in the shoulder area on both sides of the tread. The width of each inner liner strip is 20-40mm. The horizontal distance W1 from the centerline of the width direction of each inner liner strip to the centerline of the tire section is satisfied by W1 = 1 / 2W2-10mm and the actual laying width W2 of the belt layer closest to the corresponding inner liner strip position.

[0011] In some embodiments, a crown layer is also included, disposed between the tread and the belt layer. The crown layer is a single-layer flat structure disposed above the belt layer, and the cord direction of the crown layer is at 90° to the cord direction of the carcass.

[0012] In some embodiments, a crown layer is also included, disposed between the tread and the belt layer. The crown layer is a two-layer spiral cross-wound structure of cords disposed above the belt layer. The circumferential spacing between the intersection points of adjacent cords is 10-15 mm, and the cord direction is 90° to the cord direction of the tire carcass.

[0013] In some embodiments, the center thickness of the tread is 1 to 1.5 mm less than the depth of the center tread groove, and the shoulder thickness of the tread is 1 to 1.5 mm greater than the depth of the center tread groove.

[0014] In some embodiments, a crown layer is also included, disposed between the tread and the belt layer. The crown layer structure has a single-side width of 20-40 mm for the shoulder wrapping portion, overlaps with the edge of the belt layer by 10-15 mm, and the wrapping direction is 90° to the direction of the tire cord.

[0015] In some embodiments, the center thickness of the tread is 0.5 to 1.5 mm greater than the depth of the center tread groove, and the shoulder thickness of the tread is 1 to 1.5 mm less than the depth of the center tread groove.

[0016] In some embodiments, the tire also includes a bead, which comprises a triangular rubber and a steel wire bead, the tire carcass wrapping around the steel wire bead to the outside of the triangular rubber, and the end point of the wrapping tire carcass is located below the horizontal axis of the cross section, the radial height of the end point of the wrapping tire carcass is 1 / 2 of the radial height of the upper end point of the triangular rubber.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) The low rolling resistance tire of this utility model has a lateral tread groove in the shoulder area with a groove depth that is less than that in the center tread groove, so that the overall thickness of the shoulder area is less than that of the center of the tread. The overall thickness of the tire shoulder area is thinner, which helps to reduce heat generation in the shoulder area, improve the heat dissipation performance of the tire during driving, and reduce rolling resistance.

[0019] (2) The low rolling resistance tire of this utility model is covered with edge-sealing rubber sheets at both ends of the second belt layer, which can prevent water vapor and other substances from penetrating into the tire through the end points of the belt layer during the tire use, and causing a chemical reaction with the steel wire, thereby reducing the adhesion between the steel wire and the rubber components and causing the tire to bulge during use, thus improving the tire's aging resistance.

[0020] (3) The low rolling resistance tire of this utility model can effectively reduce the tire weight, reduce the tire sidewall thickness and improve the tire heat dissipation capacity by adjusting the thickness of the inner liner; by setting the inner liner rubber strip on the inner side of the inner liner in the shoulder area, the problem of the tire blank leaking the line in the shoulder during vulcanization can be avoided.

[0021] (4) The low rolling resistance tire of this utility model adopts different winding methods for the crown belt layer structure. When using single-layer flat laying or S-shaped winding, the thickness of the tread center is set to be less than the thickness of the tread shoulder. This can avoid the problem of central arching in the tire after vulcanization due to the fact that the expansion degree of the tread center and the tread shoulder is basically the same during tire vulcanization. When using shoulder winding, the thickness of the tread center is set to be greater than the thickness of the tread shoulder. This can avoid the problem of uneven tire interior caused by the lack of crown belt layer restraint in the center of the tire blank during vulcanization. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with their descriptions, serve to explain the present invention and do not constitute an undue limitation thereof. Wherein:

[0023] Figure 1 A schematic cross-sectional structure diagram of one embodiment of the low rolling resistance tire provided in this utility model;

[0024] Figure 2 A schematic cross-sectional view of another embodiment of the low rolling resistance tire provided in this utility model;

[0025] Figure 3 A schematic cross-sectional view of another embodiment of the low rolling resistance tire provided in this utility model;

[0026] Figure 4This is a schematic diagram of the low rolling resistance tire belt layer structure provided in an embodiment of the present invention;

[0027] In the attached diagram: 1. Tread, 2. Crown belt layer, 31. First belt layer, 32. Second belt layer, 4. Carcass, 5. Inner liner layer, 6. Edge trim, 7. Inner liner trim, 81. Bead wire, 82. Triangle rubber.

[0028] A. The end point of the fetal body reverse wrapping. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "lateral," "longitudinal," "upper," "lower," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature. The term "longitudinal" refers to the direction in which the tire rolls; the term "lateral" refers to the direction perpendicular to the mid-surface of the tire.

[0031] This utility model embodiment provides a low rolling resistance tire. Figure 1 This is a structural schematic diagram of a low rolling resistance tire according to an embodiment of the present invention. (Reference) Figure 1As shown, the low rolling resistance tire includes a tread 1, a carcass 4, and a belt layer disposed between the tread 1 and the carcass 4. A central tread groove extending circumferentially is provided in the central region of the tread 1, and multiple lateral tread grooves are provided in the shoulder regions on both sides of the tread 1. The groove depth H1 of the lateral tread grooves and the groove depth H2 of the central tread groove satisfy H2-H1 = 2-3 mm. This structure makes the overall thickness of the shoulder region less than the thickness of the central tread 1. The thinner overall thickness of the tire shoulder region helps reduce heat generation in the shoulder area and improves the heat dissipation performance during tire operation. In a preferred embodiment, the groove depth of the central tread groove is 6-6.5 mm to ensure the drainage performance and basic wear resistance of the central region of the tread 1.

[0032] The low rolling resistance tire of this invention comprises at least two belt layers, including a first belt layer 31 and a second belt layer 32 sequentially bonded together from bottom to top. (See attached figure.) Figure 4 As shown, both ends of the second belt layer 32 are covered with edge-sealing rubber sheets 6. The thickness of the edge-sealing rubber sheets 6 is 0.4-0.6 mm, preferably 0.5 mm, and the width is 15-25 mm, preferably 20 mm. The edge-sealing rubber sheets 6 are used to cover both ends of the second belt layer 32 to prevent water vapor and other substances from penetrating into the tire through the end points of the belt layer during tire use and reacting chemically with the steel wires, thereby reducing the adhesion between the steel wires and the rubber components and causing bulges during tire use. This also improves the tire's aging resistance.

[0033] This utility model of a low rolling resistance tire also includes an inner liner layer 5, disposed inside the tire body 4. To effectively reduce tire weight, reduce tire sidewall thickness, and improve tire heat dissipation capacity, the thickness of the inner liner layer 5 is set to 1.2-1.4 mm. Simultaneously, inner liner strips 7 are symmetrically arranged inside the inner liner layer 5 in the shoulder areas on both sides of the tread 1, which can prevent the problem of exposed threads in the shoulder area during tire curing. The width of each inner liner strip 7 is 20-40 mm, preferably 30 mm. The horizontal distance W1 from the centerline of each inner liner strip 7 in the width direction to the centerline of the tire section and the actual laying width W2 of the belt layer closest to the corresponding inner liner strip 7 position satisfy W1 = 1 / 2W2 - 10 mm. The inner lining strip 7 uses the same rubber material as the transition layer. During the calendering process of the inner lining layer semi-finished product, the rubber sheet is extruded through an additional extruder. Then, it is applied to the inner lining layer through a bonding and correction device and then rolled up. The inner lining strip 7 and the inner lining layer are prepared at the same time, which greatly saves the preparation time of the semi-finished product. At the same time, since the inner lining layer still has a high temperature after calendering, the inner lining strip 7 and the inner lining layer can be tightly bonded together, effectively reducing the problem of air bubbles during the bonding process.

[0034] Reference Appendix Figure 1 -Appendix Figure 3As shown, the low rolling resistance tire of this invention also has a crown belt layer 2 between the tread 1 and the belt layer. The crown belt layer 2 is arranged on the belt layer in the form of a single layer laid flat, S-shaped winding, or shoulder winding. In the single layer laid flat structure, the cord direction of the crown belt layer 2 is 90° with the cord direction of the tire carcass. The crown belt layer 2 is a two-layer cord spiral cross-wound structure arranged above the belt layer. The circumferential spacing between the intersection points of adjacent cords is 10-15mm, and the cord direction of the crown belt layer 2 is 90° with the cord direction of the tire carcass 4. The single-side width of the shoulder winding part of the crown belt layer 2 is 20-40mm, preferably 30mm, and overlaps with the edge of the belt layer by 10-15mm. The winding direction is 90° with the cord direction of the tire carcass. When the crown belt layer 2 is laid flat or wound in an S-shape, the center thickness of the tread 1 is set to be less than the shoulder thickness. Specifically, the center thickness of the tread 1 is 1-1.5 mm less than the depth of the center tread groove, and the shoulder thickness is 1-1.5 mm greater than the depth of the center tread groove. Because the crown area is restrained by the crown belt layer, the shoulder and center of the tire blank expand similarly during vulcanization, which can avoid the problem of central arching in the tire after vulcanization. When the crown belt layer 2 is wound on the shoulder, the center thickness of the tread 1 is set to be greater than the shoulder thickness. Specifically, the center thickness of the tread 1 is 0.5-1.5 mm greater than the depth of the center tread groove, and the shoulder thickness is 1-1.5 mm less than the depth of the center tread groove. This structure can avoid the problem of uneven tire interior caused by the lack of crown belt layer restraint in the center area during the vulcanization process.

[0035] The low rolling resistance tire of this utility model also includes a bead, which includes a triangular rubber 82 and a steel wire ring 81. The tire body 4 wraps around the steel wire ring 81 and wraps back to the outside of the triangular rubber 82. The reverse end point A of the tire body 4 is located below the horizontal axis of the cross section. The radial height of the reverse end point A of the tire body is 1 / 2 of the radial height of the upper end point of the triangular rubber 82.

[0036] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A low rolling resistance tire characterized by: The tire includes a tread, a carcass, and a belt layer arranged between the tread and the carcass, wherein a center groove extending in the tire circumferential direction is arranged in a middle region of the tread, a plurality of transverse grooves are arranged in shoulder regions on both sides of the tread, and the groove depth H1 of the transverse grooves and the groove depth H2 of the center groove satisfy H2-H1=2-3mm.

2. The low rolling resistance tire of claim 1, wherein: The belt layer includes a first belt layer and a second belt layer sequentially attached from bottom to top, wherein the two end portions of the second belt layer are each attached with a covering rubber sheet, the thickness of the covering rubber sheet is 0.4-0.6mm, and the width of the covering rubber sheet is 15-25mm.

3. The low rolling resistance tire of claim 1, wherein: An inner liner is further included and arranged inside the carcass, and the thickness of the inner liner is 1.2-1.4mm.

4. The low rolling resistance tire of claim 3, wherein: An inner liner rubber strip is symmetrically arranged inside the inner liner in the shoulder regions on both sides of the tread, the width of each inner liner rubber strip is 20-40mm, and the horizontal distance W1 from the center line of each inner liner rubber strip to the center line of the tire cross section and the actual laying width W2 of the corresponding belt layer closest to the position of the inner liner rubber strip satisfy W1=1 / 2W2-10mm.

5. The low rolling resistance tire of claim 1, wherein: A crown belt layer is further included and arranged between the tread and the belt layer, the crown belt layer is a single-layer flat structure arranged above the belt layer, and the cord direction of the crown belt layer is 90° to the cord direction of the carcass.

6. The low rolling resistance tire of claim 1, wherein: A crown belt layer is further included and arranged between the tread and the belt layer, the crown belt layer is a two-layer cord helical cross winding structure arranged above the belt layer, the circumferential distance between adjacent cord cross points is 10-15mm, and the cord direction is 90° to the cord direction of the carcass.

7. The low rolling resistance tire of claim 5 or 6, wherein: The center thickness of the tread is 1-1.5mm less than the groove depth of the center groove, and the shoulder thickness of the tread is 1-1.5mm greater than the groove depth of the center groove.

8. The low rolling resistance tire of claim 1, wherein: A crown belt layer is further included and arranged between the tread and the belt layer, the structure of the crown belt layer adopts a single-side width of 20-40mm for the shoulder winding part, the single-side width of the shoulder winding part overlaps the edge of the belt layer by 10-15mm, and the winding direction is 90° to the cord direction of the carcass.

9. The low rolling resistance tire of claim 8, wherein: The center thickness of the tread is 0.5-1.5mm greater than the groove depth of the center groove, and the shoulder thickness of the tread is 1-1.5mm less than the groove depth of the center groove.

10. The low rolling resistance tire of claim 1, wherein: A bead is further included, the bead includes a triangular rubber and a steel wire ring, the carcass is wrapped around the steel wire ring and back to the outside of the triangular rubber, and the wrapping end point of the carcass is below the horizontal axis of the cross section, and the radial height of the wrapping end point of the carcass is 1 / 2 of the radial height of the upper end point of the triangular rubber.

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