Tire bead structure of truck radial tire

Abstract

The utility model provides a tire bead structure of a truck radial tire. The tire bead structure comprises a tire bead body, a steel wire ring, a tire body layer, a first steel wire reinforcing layer and a second steel wire reinforcing layer, the bead ring is arranged on the bead body; the tire body layer extends downwards from the axial inner side of the tire bead body so as to wrap the steel wire ring, and then extends outwards so as to reversely wrap the axial outer side of the tire bead body; the second steel wire reinforcing layer is arranged on the axial outer side of the tire body layer, and the first steel wire reinforcing layer extends downwards from the axial inner side of the tire body layer and then extends towards the axial outer side so as to be arranged on the axial outer side of the second steel wire reinforcing layer. The strength of the first steel wire reinforcing layer is high, and the load resistance and durability can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tire technical field, especially in a kind of load radial tire's lip structure. BACKGROUND

[0002] To adapt to the use situation of domestic all-steel load radial tire high load, refer to Figure 1 Its lip structure 10 usually adopts in carcass reverse layer on a layer of steel wire reinforcing layer 50 and in steel wire reinforcing layer 50 outside one or more layers of nylon reinforcing layer 60 are packed. Although it improves the load resistance of lip to a certain extent, however, under the condition that load is higher than 200%, the lip part still occurs greater flexural deformation, and the larger strain and stress concentration of steel wire reinforcing layer 50 outside end point 50b and nylon reinforcing layer 60 outside end point 60b position, one, poor load resistance, two, easy to cause rubber at end point position to heat too high and occur adhesion failure or scorch, so that the lip occurs bulge or crack. SUMMARY

[0003] The utility model aims at overcoming at least one of the above prior art, provide a kind of load radial tire's lip structure, further improve load resistance.

[0004] To solve the above technical problems, the utility model provides a kind of load radial tire's lip structure, including lip body, bead, carcass layer, first steel wire reinforcing layer and second steel wire reinforcing layer;

[0005] The bead is set on the lip body;The carcass layer extends downward from the axial inner side of the lip body to cover the bead, and then extends outward to be reversed in the axial outer side of the lip body;The second steel wire reinforcing layer is set in the axial outer side of the carcass layer, and the first steel wire reinforcing layer extends downward from the axial inner side of the carcass layer and then extends to the axial outer side to be set in the axial outer side of the second steel wire reinforcing layer.

[0006] In a more preferred embodiment, the first steel wire reinforcing layer and the second steel wire reinforcing layer are further provided with isolation type glue.

[0007] In a more preferred embodiment, the upper end point of the second steel wire reinforcing layer and the lip body are further provided with heat-resistant adhesive sheet.

[0008] In a more preferred embodiment, the lip body includes a triangular rubber body;The first steel wire reinforcing layer is U-shaped to be wrapped outside the bead, the triangular rubber body, the carcass layer and the second steel wire reinforcing layer, and the inner side end point of the first steel wire reinforcing layer is higher than the end point of the triangular rubber body;The radial distance between the inner side end point of the first steel wire reinforcing layer and the end point of the triangular rubber body is 1mm to 15mm.

[0009] In a preferred embodiment, the steel cord of the first steel wire reinforcing layer and the steel cord of the second steel wire reinforcing layer are arranged in an inclined cross arrangement, wherein:

[0010] The steel cord of the first steel wire reinforcing layer forms an angle of 10° to 60° with the circumferential direction of the tire;

[0011] And / or, the steel cord of the second steel wire reinforcing layer forms an angle of 10° to 50° with the circumferential direction of the tire.

[0012] In a preferred embodiment, the second steel wire reinforcing layer is arranged between the carcass layer and the first steel wire reinforcing layer, the breaking strength of the second steel wire reinforcing layer is 40% to 60% of the first steel wire reinforcing layer, and the bending stiffness of the second steel wire reinforcing layer is 45% to 65% of the first steel wire reinforcing layer.

[0013] In a preferred embodiment, the lower end point of the second steel wire reinforcing layer is located below the bottom of the bead.

[0014] In a preferred embodiment, the outer end point of the first steel wire reinforcing layer is higher than the outer end point of the carcass layer, and the radial distance between the outer end point of the first steel wire reinforcing layer and the outer end point of the carcass layer is 1mm to 20mm.

[0015] The upper end point of the second steel wire reinforcing layer is higher than the outer end point of the first steel wire reinforcing layer, and the radial distance between the upper end point of the second steel wire reinforcing layer and the outer end point of the first steel wire reinforcing layer is 1mm to 20mm.

[0016] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

[0017] The lip structure comprises a lip body, a bead, a carcass layer, a first steel wire reinforcing layer and a second steel wire reinforcing layer. The bead is arranged on the lip body; the carcass layer extends downward from the axial inner side of the lip body to cover the bead, and then extends outward to be wrapped on the axial outer side of the lip body; the second steel wire reinforcing layer is arranged on the axial outer side of the carcass layer, and the first steel wire reinforcing layer extends downward from the axial inner side of the carcass layer and then extends to the axial outer side to be arranged on the axial outer side of the second steel wire reinforcing layer. The first steel wire reinforcing layer has high strength, which can effectively improve the load endurance performance.

[0018] A heat-resistant adhesive film is further arranged between the upper end point of the second steel wire reinforcing layer and the lip body, which is beneficial to absorb the heat generated by the upper end point of the second steel wire reinforcing layer due to excessive height and excessive strain energy, effectively delays the time of adhesion failure and burning at the above-mentioned end point position, and improves the endurance performance of the lip. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the bead structure in the prior art;

[0020] Figure 2 This is a cross-sectional schematic diagram of the bead structure in a preferred embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] A bead structure for a heavy-duty radial truck tire, applicable to both tubed and tubeless heavy-duty radial truck tires. The bead structure includes a bead body, a bead ring 2, a carcass layer 4, a first steel wire reinforcement layer 5, and a second steel wire reinforcement layer 6. The bead ring 2 is disposed on the bead body; the carcass layer 4 extends downward from the axially inner side of the bead body to cover the bead ring 2, and then extends outward to wrap around the axially outer side of the bead body; the second steel wire reinforcement layer 6 is disposed on the axially outer side of the carcass layer 4, and the first steel wire reinforcement layer 5 extends downward from the axially inner side of the carcass layer 4 and then extends outward to be disposed on the axially outer side of the second steel wire reinforcement layer 6. Here, the axial direction of the tire refers to... Figure 2 The direction indicated by the X-shaped arrow is shown, with the inside and outside marked on the arrow.

[0023] An isolation adhesive 7 is also provided between the first steel wire reinforcement layer 5 and the second steel wire reinforcement layer 6. The isolation adhesive 7 can increase the thickness between the upper end point 6b of the second steel wire reinforcement layer 6 and the outer end point 5b of the first steel wire reinforcement layer 5, reduce shear stress, and thus further reduce the probability of tire bead structure failure.

[0024] A heat-resistant adhesive sheet 8 is also provided between the upper end point 6b of the second steel wire reinforcing layer 6 and the tire bead body. The heat-resistant adhesive sheet 8 is a highly adhesive heat-resistant adhesive sheet with a width of 15 mm to 50 mm and a thickness of 0.5 mm to 2 mm. The middle of the heat-resistant adhesive sheet 8 is placed near the upper end point 6b of the second steel wire reinforcing layer 6, which helps to absorb the heat generated by the excessive strain energy at the upper end point 6b of the second steel wire reinforcing layer 6 due to its excessive height, effectively delaying the time of adhesion failure and scorching at the above-mentioned end point, and improving the durability of the tire bead.

[0025] The tire bead body includes a triangular rubber body 3; the triangular rubber body 3 is a hard rubber extrusion molding, the rubber has a Shore hardness range of 60 Shore (A) to 90 Shore (A), and the radial height of the end point 3a of the triangular rubber body is 60 mm to 100 mm, which can enhance the strength and rigidity of the tire bead and reduce the radial deformation of the tire under load.

[0026] The first steel wire reinforcing layer 5 is in a U shape to wrap outside the bead wire 2, the apex rubber 3, the carcass layer 4 and the second steel wire reinforcing layer 6, the inner side end point 5a of the first steel wire reinforcing layer 5 is higher than the end point 3a of the apex rubber; the radial distance a between the inner side end point 5a of the first steel wire reinforcing layer 5 and the end point 3a of the apex rubber is 1mm to 15mm. Appropriately increasing the height of the inner side end point 5a of the first steel wire reinforcing layer 5, the distance from the inner side end point 5a of the first steel wire reinforcing layer 5 to the bottom of the bead wire 2 is far, the force arm is longer, which can prevent the inner wrapping section of the first steel wire reinforcing layer 5 from being popped up to cause the tire lip bubble during the tire manufacturing process, and can also enhance the strength and rigidity of the inner side of the tire lip, and disperse the stress of the end point of the apex rubber.

[0027] The steel cord of the first steel wire reinforcing layer 5 and the steel cord of the second steel wire reinforcing layer 6 are arranged in an inclined cross, and the first steel wire reinforcing layer 5 and the second steel wire reinforcing layer 6 are arranged in an inclined cross, which can significantly improve the strength and rigidity of the tire lip, reduce the deformation of the tire lip, and further improve the load bearing performance of the tire and prolong the service life of the tire. Wherein: the steel cord of the first steel wire reinforcing layer 5 forms an angle of 10° to 60° with the circumferential direction of the tire, the steel cord uses high elongation steel wire, the single steel wire diameter is 0.8mm to 1.6mm, and the breaking tension is 1500N to 2500N; and / or, the steel cord of the second steel wire reinforcing layer 6 forms an angle of 10° to 50° with the circumferential direction of the tire, the steel cord uses high elongation steel wire, the single steel wire diameter is 0.6mm to 1.4mm, and the breaking tension is 600N to 1500N.

[0028] The second steel wire reinforcing layer 6 is arranged between the carcass layer 4 and the first steel wire reinforcing layer 5, the breaking strength of the second steel wire reinforcing layer 6 is 40% to 60% of the first steel wire reinforcing layer 5, and the bending rigidity of the second steel wire reinforcing layer 6 is 45% to 65% of the first steel wire reinforcing layer 5, which is used to set a rigid buffer zone between the carcass layer 4 and the high-strength first steel wire reinforcing layer 5, reduce the shear stress between the carcass and the high-strength steel wire, and at the same time improve the smoothness of the reverse wrapping forming rolling of the tire lip outside during the tire manufacturing process, and reduce the production failure rate.

[0029] The lower end point 6a of the second steel wire reinforcing layer 6 is located below the bottom of the bead wire 2, the second steel wire reinforcing layer 6 adopts a half-wrapped structure, and the lower end point 6a of the second steel wire reinforcing layer 6 is limited to a position below the bottom of the bead wire 2, which is beneficial to increase the fitting force of the tire lip part and the rim and reduce the risk of tire unseating during use. And the lower end point 6a is not extended to the inner side of the bead wire 2, which can prevent the inner side end point 5a from being popped up due to excessive reverse stress during tire production to cause tire lip bubbles.

[0030] The outer end point 5b of the first steel wire reinforcing layer 5 is higher than the outer end point 4a of the carcass layer 4, and the radial distance b between the outer end point 5b of the first steel wire reinforcing layer 5 and the outer end point 4a of the carcass layer 4 is 1mm to 20mm; the upper end point 6b of the second steel wire reinforcing layer 6 is higher than the outer end point 5b of the first steel wire reinforcing layer 5, and the radial distance c between the upper end point 6b of the second steel wire reinforcing layer 6 and the outer end point 5b of the first steel wire reinforcing layer 5 is 1mm to 20mm. The radial offset of the three steel wire end points is advantageous for dispersing the stress of the deformation area, and can enhance the bending stiffness of the positions of the outer end point 4a of the carcass layer 4 and the outer end point 5b of the first steel wire reinforcing layer 5, and relieve the rigidity gradient of the above two end points. The overall effect is to reduce the strain and stress concentration of the positions of the outer end point of the carcass layer 4 and the outer end point 5b of the first steel wire reinforcing layer 5, thereby greatly reducing the heat generation of the rubber at the positions of the above two end points, and greatly reducing the excessive heat generation of the rubber at the positions of the above two end points, thereby preventing the adhesive failure or burning of the rubber.

[0031] Tread cap durability test:

[0032] A tire test drum is used, and the test tire is mounted on a standard rim with a size of 8.5, inflated to a pressure of 1000kpa, and loaded with twice the standard load, and rotated at a linear speed of 20km / h at an ambient temperature of 38 degrees Celsius until the tire appears to have a tread cap crack, at which time the mileage is measured. In Table 1, the test results are represented by an index, with the index of the tire produced by the prior art being taken as a reference value of 100, and the higher the index, the better the tread cap durability.

[0033] Table 1

[0034] Category Bead durability Control tire 100 Test tire 133

[0035] Tire stiffness test:

[0036] A tire stiffness tester is used, and the test tire is mounted on a standard rim with a size of 8.5, inflated to a standard pressure, and loaded with a standard load, and tested under room temperature conditions, and the test results are measured by the device program. In Table 2, the test results are represented by an index, with the index of the tire produced by the prior art being taken as a reference value of 100, and the higher the index, the higher the tread cap stiffness.

[0037] Table 2

[0038] Category Radial stiffness Lateral stiffness Longitudinal stiffness Torsional stiffness Control tire 100 100 100 100 Test tire 100 112 114 117

[0039] The above merely describes a preferred embodiment of the present application, and the design concept of the present application is not limited thereto, and any person skilled in the art, within the technical scope disclosed by the present application, can make non-essential changes to the present application using the concept, and such changes shall be deemed to fall within the protection scope of the present application.

Claims

1. A bead structure for a load radial tire, characterized by, The tire lip body, the bead, the carcass layer, the first steel wire reinforcing layer and the second steel wire reinforcing layer are provided. The bead is arranged on the tire lip body; the carcass layer extends downward from the axially inner side of the tire lip body to cover the bead, and then extends outward to wrap around the axially outer side of the tire lip body; the second steel wire reinforcing layer is arranged on the axially outer side of the carcass layer, and the first steel wire reinforcing layer extends downward from the axially inner side of the carcass layer and then extends to the axially outer side to be arranged on the axially outer side of the second steel wire reinforcing layer.

2. The chafer structure of claim 1 wherein: An isolation type glue is further arranged between the first steel wire reinforcing layer and the second steel wire reinforcing layer.

3. The chafer structure of claim 1 wherein: A heat-resistant glue sheet is further arranged between the upper end point of the second steel wire reinforcing layer and the tire lip body.

4. The tire lip structure of the load radial tire according to claim 1, wherein: The tire lip body comprises a triangular rubber body; the first steel wire reinforcing layer is in a U shape to wrap around the outer side of the bead, the triangular rubber body, the carcass layer and the second steel wire reinforcing layer, and the inner side end point of the first steel wire reinforcing layer is higher than the end point of the triangular rubber body; The radial distance between the inner side end point of the first steel wire reinforcing layer and the end point of the triangular rubber body is 1 mm to 15 mm.

5. The tire lip structure of the load radial tire according to claim 1, wherein: The steel cord of the first steel wire reinforcing layer and the steel cord of the second steel wire reinforcing layer are arranged in an inclined cross arrangement, wherein: The steel cord of the first steel wire reinforcing layer forms an angle of 10° to 60° with the circumferential direction of the tire; And / or, the steel cord of the second steel wire reinforcing layer forms an angle of 10° to 50° with the circumferential direction of the tire.

6. The chafer structure of claim 1 wherein: The second steel wire reinforcing layer is arranged between the carcass layer and the first steel wire reinforcing layer, the breaking strength of the second steel wire reinforcing layer is 40% to 60% of that of the first steel wire reinforcing layer, and the bending stiffness of the second steel wire reinforcing layer is 45% to 65% of that of the first steel wire reinforcing layer.

7. The chafer structure of claim 1 wherein: The lower end point of the second steel wire reinforcing layer is located below the bottom of the bead.

8. The chafer structure of claim 1 wherein: The outer side end point of the first steel wire reinforcing layer is higher than the outer side end point of the carcass layer, and the radial distance between the outer side end point of the first steel wire reinforcing layer and the outer side end point of the carcass layer is 1 mm to 20 mm; The upper end point of the second steel wire reinforcing layer is higher than the outer side end point of the first steel wire reinforcing layer, and the radial distance between the upper end point of the second steel wire reinforcing layer and the outer side end point of the first steel wire reinforcing layer is 1 mm to 20 mm.

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