CN218257576U - Tread with protective layer on surface - Google Patents

Abstract

The utility model relates to the technical field of tires, and discloses a tread with a protective layer on the surface, which comprises main tread rubber, a tread groove arranged on the main tread rubber, and a protective layer paved on the surface of the groove wall of any one or more tread grooves; the section of the protective layer is in a rectangular, trapezoidal, triangular, arched or irregular shape which is matched with the shape of the pattern groove; the protective layer that covers whole week is glued at appointed decorative pattern ditch bottom position department of tire, and the tread that uses this protective layer can attenuate whole size thickness and does not reduce its anti ditch and split the performance, so use the utility model discloses a tire that the tread was made has low rolling resistance performance concurrently.

Description

Tread with protective layer on surface

Technical Field

The utility model relates to a tire technical field, concretely relates to surface has tread of protective layer.

Background

A pneumatic tire generates mechanical stress periodically alternating in a tread portion directly contacting the ground during vehicle running. More specifically, when the tread blocks come into contact with the ground, a part of the pressure applied to the tread blocks of the tire is directly transmitted to the vicinity of the groove bottom, and the blocks expand into the groove due to the pressure, and a drum-like deformation occurs in which the middle width is wide and the ends are narrow, thereby increasing the stress concentration phenomenon at the groove bottom due to the pressure. When the tire leaves the ground, the pressure is gradually released, and under the influence of the inflation internal pressure, the pressure stress of the groove bottom is gradually converted into tensile stress, and the repeated tensile and pressure alternating stress is one of the main causes of fatigue failure of the groove bottom of the tire tread. In addition, the unsaturated backbone of the tread rubber polymer is susceptible to oxygen/ozone attack and aging, causing it to become brittle and hard, greatly reducing mechanical properties, further accelerating crack initiation and propagation at the base of the tire grooves.

In order to improve the crack resistance of the tire tread, tire manufacturers generally increase the content of protective wax or chemical anti-aging agent, while excessive protective wax and chemical anti-aging agent increase the manufacturing cost, and the protective wax and chemical anti-aging agent are precipitated due to the change of the use environment, so that the appearance of the tire is poor.

Therefore, there is a need to develop a tread that can promote resistance to the occurrence and propagation of cracks on the surface of the tire groove without sacrificing other properties of the tread rubber, such as wear properties, grip properties, etc.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a surface has tread of protective layer.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a tread with a protective layer on the surface comprises main tread rubber, a groove arranged on the main tread rubber and a protective layer paved on the groove wall surface of any one or more grooves; the section of the protective layer is rectangular, trapezoidal, triangular or arched which is matched with the shape of the pattern groove.

The cross section of the protective layer may also be irregular, which refers to an irregular polygon or a polygon with curved boundaries.

Further, the distance between the protective layer center point P and the tread cross dimension center line CL is L, the distance between the tire groove width center point P 'and the tire mold design symmetry center plane CL' is L ', and L' satisfy: l is more than or equal to L '-5mm and less than or equal to L' +5mm; through the mode, the accuracy of the protective layer and the position of the corresponding groove is guaranteed, and the protective layer is prevented from overflowing the groove to cause eccentric wear of the tire.

Further, the protective layer covers a partial surface of the groove wall or covers the entire surface of the groove wall.

Further, the width Wg of the groove and the width Wp of the protective layer satisfy: 0.5 × Wg ≤ Wp ≤ 3.0 × Wg.

Further, the surface area Sp of the protective layer and the sectional area St of the main tread rubber within the range of the width Wp directly below the protective layer satisfy: sp is not less than 0.15 × St.

It should further satisfy: sp is more than or equal to 0.2St.

Compared with the prior art, the utility model has the advantages that:

the utility model provides a tread that has set up the protective layer, this kind of improvement tread can cover whole week protective layer at the appointed decorative pattern ditch bottom position department of tire and glue, and the tread that uses this protective layer can attenuate whole size thickness and does not reduce its anti ditch and split the performance, so use the utility model discloses a tire that the tread was made has low rolling resistance performance concurrently, in addition the utility model discloses do not change the tread groove size parameter of tire self, also do not basically change the rubber attribute in ground plane, so can not sacrifice other performance characteristics of tire, specifically indicate the doing of tire, wetland grab ground performance.

In addition, the position, the width and the area of the protective layer on the tread are defined reasonably, so that the tread with excellent crack resistance can be obtained, the protective layer cannot overflow to the surface of the pattern block, and the problems of eccentric wear and different wear caused by the existence of two types of rubber on the surface of the pattern block cannot occur.

Drawings

FIG. 1 is a schematic view of a tread having a rectangular protective layer;

FIG. 2 is a schematic cross-sectional view of a tire having a protective layer;

FIG. 3 is a schematic view of a tread having a protective layer disposed within a plurality of grooves;

FIG. 4a is a schematic view of a tread having a trapezoidal protective layer;

FIG. 4b is a schematic view of a tread having a trapezoidal protective layer;

FIG. 5 is a schematic view of a tread having a triangular cap layer;

FIG. 6 is a schematic view of a tread having an arcuate protective layer;

FIG. 7 is a schematic view of a tread having an irregularly shaped protective layer.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a tread 1 of a tire has at least one groove 2 arranged along the circumferential direction of the tire and blocks 3 formed by being partitioned by the groove 2, and the tread 1 includes a main tread rubber 11, a protective layer 12 on the surface of the main tread rubber 11, and a wing rubber 13 on both sides of the main tread rubber 11. Wherein the grooves 2 may also be arranged in the tire axial direction.

As shown in fig. 1, the protective layer 12 is a polymer containing ethylene propylene diene monomer, and the molecular main chain of the protective layer contains a certain amount of chemically stable and uniformly dispersed saturated hydrocarbon, so that the aging resistance of the groove 2, such as ozone resistance, heat resistance, cold resistance and the like, can be greatly improved, the time of the tire for generating cracks due to rubber aging can be greatly prolonged, and the problem of poor appearance of the tire due to precipitation of the anti-aging agent can be effectively avoided because the protective layer 12 has excellent aging resistance and the use amounts of protective wax and a chemical anti-aging agent can be reduced. In the utility model, the material of the protective layer 12 is petrochemical three-well EPDM 3640 or Exxon Mobil EPDM 7500.

As shown in fig. 1, the distance between the center point P of the protective layer 12 and the center line CL of the cross dimension of the tread 1 is L, and as shown in fig. 2, the distance L ' between the center point P ' in the width direction of the groove 2 and the center plane CL ' of the tire cross section structural design must satisfy the relation: l is more than or equal to L '-5mm and less than or equal to L' +5mm.

As shown in fig. 2, the design width of the groove 2 is Wg, the design of the upper surface width Wp of the protective layer 12 should not be too narrow, otherwise it is difficult to cover the groove bottom chamfer area where stress concentration easily occurs, and should not be too wide, otherwise it is possible to cause the protective layer 12 to overflow to the surface of the pattern block 3 near the groove 2, so that the tire has eccentric wear and abnormal wear problems during use, and therefore the relation should be satisfied: 0.5 Wg ≤ Wp ≤ 3.0 Wg

As shown in fig. 1, the area Sp of the protective layer 12 should not be too small, otherwise the effect of protecting the tread 1 is difficult to achieve, and therefore, the area Sp of the main tread rubber 111 in the range of the width Wp directly below should satisfy the relation: sp ≧ 0.15 × St, further satisfying: sp is more than or equal to 0.2St.

As shown in fig. 1 and 3, the protective layer 12 on the surface of the tread 1 mainly covers the position of the groove 2, and may cover any one of the grooves 2 of the tread 1 or simultaneously cover a plurality of grooves 2 as required. The protective layer 12 may be extruded by an extruder together with other components of the tread 1, or may be attached to the surface layer of the tread 1 by means of bonding, coating, spraying, or the like. As shown in fig. 4a, 4b, 5 and 6, the shape of the protective layer 12 disposed on the semi-finished tread 1 may be designed to be regular rectangle, trapezoid, triangle, arch, etc., or irregular shape, as shown in fig. 7.

Comparative example

Producing a finished tyre having a base structure, the tyre parameters being as follows: the tire size was 225/65R17 (i.e., the tire nominal width was 225mm, the aspect ratio was 65%, and the mounting rim size was 6.5J × 17), the internal pressure was inflated with air to 250kPa, the groove 2 had no protective layer 12, wg =12.5mm, four tires were mounted on the original vehicle, and the vehicle was removed after running on a fixed running route for 1 year in a full-load condition.

Examples

On the basis of the comparative example, the thickness of the tread 1 is thinned by 0.8mm, the protective layer 12 is arranged at the four grooves 2 of the tread 1, and the position, the width and the area of the protective layer 12 are adjusted: l = L' =48.5mm, wp =8mm, sp/St =0.29.

Note: the roll resistance levels in the table above are converted in percent from actual test values, with lower values being lower roll resistance test values.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A tread with a protective layer on the surface is characterized by comprising main tread rubber, a groove arranged on the main tread rubber and a protective layer paved on the groove wall surface of any one or more grooves; the section of the protective layer is rectangular, trapezoidal, triangular or arched which is adapted to the shape of the groove.

2. The tread of claim 1 having a protective layer on a surface thereof, wherein: the distance between the central point P of the protective layer and the central line CL of the cross section dimension of the tread is L, the distance between the width central point P 'of the tire pattern groove and the central plane CL' of the design symmetry of the tire mold is L ', and L' meet the following conditions: l is more than or equal to L '-5mm and less than or equal to L' +5mm.

3. The tread of claim 1 having a protective layer on a surface thereof, wherein: the protective layer covers a portion of the surface of the groove wall or covers the entire surface of the groove wall.

4. The tread of claim 3 having a protective layer on the surface thereof, wherein: the width Wg of the pattern groove and the width Wp of the protective layer satisfy: 0.5 Wg is less than or equal to Wp and less than or equal to 3.0 Wg.

5. The tread of claim 1 having a protective layer on a surface thereof, wherein: the surface area Sp of the protective layer and the sectional area St of the main tread rubber within the range of the width Wp right below the protective layer satisfy: sp is greater than or equal to 0.15.

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