A bias port tire

Abstract

The present invention discloses a bias port tire, comprising a carcass and a cord layer arranged inside the carcass, wherein the carcass comprises a crown, a shoulder, a sidewall and a bead, wherein the cord layer is cross-arranged and arranged in multiple layers, and a heat dissipation hole is arranged between the outer surface of the sidewall and the middle layer of the cord layer. The shoulder and bead regions of the tire are high-incidence areas for heat generation during the use of the tire. By drilling holes in the shoulder and bead regions of the tire to the inside of the carcass cord, the heat accumulated inside the cord layer is dissipated along the drilled holes during use, thereby avoiding the thermal delamination of the cord layer. After the improvement, the service life and durability hours of the tire are greatly improved under the premise that the original production process remains unchanged.

Description

Technical Field

[0001] The invention belongs to the technical field of tire design, and in particular relates to a bias harbor tire. Background Art

[0002] The tire includes a carcass, which is divided into a crown, shoulder, sidewall and bead according to the position. Due to the need for installation and use, traditional bias port tires usually have more cord layers in the shoulder and bead areas, making the cord layers in the shoulder and bead areas thicker. During use, the heat is concentrated in the cord layers and is difficult to dissipate. As the temperature increases, the strength of the cord layers decreases sharply, and finally breaks and thermal delamination occurs, causing early damage to the tire and affecting the safety performance of the tire.

[0003] Therefore, the prior art needs to be further developed and improved. Summary of the invention

[0004] In view of the various deficiencies of the prior art and in order to solve the above problems, a bias port tire is proposed. The present invention provides the following technical solutions:

[0005] A bias port tire comprises a carcass and a cord layer arranged inside the carcass, wherein the carcass comprises a crown, a shoulder, a sidewall and a bead, the cord layer is cross-arranged in multiple layers, and heat dissipation holes are arranged between the outer surface of the sidewall and the middle layer of the cord layer.

[0006] Furthermore, a rim assembly line is provided on the tire body, and the rim assembly line is arranged in a ring shape along the outer circumference of the tire bead.

[0007] Furthermore, the heat dissipation holes include shoulder heat dissipation holes and tire bead heat dissipation holes, the shoulder heat dissipation holes are arranged in the tire shoulder area, and the tire bead heat dissipation holes are arranged in an area close to the rim assembly line.

[0008] Furthermore, the position of the deepest point of the shoulder heat dissipation hole is: draw a perpendicular line from the intersection of the crown outer surface and the shoulder outer surface to the inner surface of the carcass layer to obtain line L, the thickness of line L on the carcass layer is line M, and the midpoint A of line M is taken as the deepest point of the shoulder heat dissipation hole.

[0009] Furthermore, the drilling path of the shoulder heat dissipation hole is: starting from A and extending horizontally to the outer contour of the tire to obtain an intersection Q, and the line connecting Q and A is the drilling path of the shoulder heat dissipation hole.

[0010] Furthermore, the distance from Q to the center axis of the tire is C, and the number of the shoulder heat dissipation holes E = [2πC / 50].

[0011] Furthermore, the position of the deepest point of the tire bead heat dissipation hole is: taking the rim assembly line as the reference point and offsetting it by 10 mm to the outer periphery as the reference point, a perpendicular line is drawn from the reference point to the inner surface of the carcass layer to obtain line O, the thickness of line O on the carcass layer is line P, and the midpoint B of line P is taken as the deepest point of the tire bead heat dissipation hole.

[0012] Furthermore, the drilling path of the tire bead heat dissipation hole is: starting from B and extending horizontally to the outer contour of the tire to obtain an intersection R, and the line connecting R and B is the drilling path of the tire bead heat dissipation hole.

[0013] Furthermore, the distance from R to the center axis of the tire is D, and the number of the tire bead heat dissipation holes F = [2πD / 50].

[0014] Furthermore, the heat dissipation hole is a conical heat dissipation hole drilled by a conical drill bit.

[0015] Beneficial effects:

[0016] The present application performs uniform drilling treatment on the temperature concentrated areas near the shoulder and bead of the bias port tire, thereby greatly improving the heat dissipation rate in the shoulder and bead areas of the bias port tire while ensuring that the original tire structure and production process remain unchanged, avoiding heat concentration, thereby reducing the occurrence of thermal delamination, and improving the service life and safe use of the bias port tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional structure diagram of a bias port tire in a specific embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the punching positions of a bias port tire in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0020] like Figure 1-2As shown, a bias port tire includes a carcass 1 and a cord layer 2 arranged inside the carcass 1, and heat dissipation holes are arranged between the middle layers of the cord layer. The carcass 1 includes a crown 3, a shoulder 4, a sidewall 5 and a bead 6, and heat dissipation holes are arranged between the middle layers of the cord layer. The cord layer 2 is arranged in multiple layers in a cross-arranged manner, and heat dissipation holes are arranged between the middle layers of the cord layer. Heat dissipation holes are arranged between the outer surface of the sidewall 5 and the middle layer of the cord layer 2. The shoulder 4 and bead 6 areas of the tire are high-incidence areas for heat generation during the use of the tire. By drilling holes in the shoulder 4 and bead 6 areas of the tire to the inside of the cord of the carcass 1, the heat accumulated in the cord layer 2 is dissipated along the drilled holes during use, thereby avoiding the thermal delamination of the cord layer 2. After the improvement, the service life and durability hours of the tire are greatly improved under the premise that the original production process remains unchanged.

[0021] Furthermore, heat dissipation holes are provided between the middle layers of the cord layer, and a rim assembly line 7 is provided on the carcass 1. The heat dissipation holes are provided between the middle layers of the cord layer. The rim assembly line 7 is arranged in a ring shape along the outer circumference of the tire bead 6. The rim assembly line 7 is arranged protruding from the sidewall 5, and its position is usually fixedly arranged according to a unified standard. The protruding arrangement facilitates direct observation of whether the installation is in place. At the same time, since the cord layer 2 is arranged inside the tire, it is difficult to judge the thickest position of the cord layer 2 in its use state except for the design drawing. The rim assembly line 7 facilitates the determination of the thickest position of the cord layer 2, which is convenient for the user to refer to when drilling.

[0022] Furthermore, heat dissipation holes are provided between the middle layers of the cord layer. The heat dissipation holes include shoulder heat dissipation holes and bead heat dissipation holes. The heat dissipation holes are provided between the middle layers of the cord layer. The shoulder heat dissipation holes are provided in the shoulder 4 area. The heat dissipation holes are provided between the middle layers of the cord layer. The bead heat dissipation holes are provided in the rim assembly line 7 area close to the middle layers of the cord layer. The heat dissipation holes are provided only at the thickest position from the cord layer 2 to the outer surface of the tire, which greatly reduces the number of heat dissipation holes, ensures the overall structural strength and durability of the tire, and at the same time dissipates the generated heat along the heat dissipation holes as much as possible, avoiding the strength reduction and fracture and delamination of the cord layer 2 due to overheating.

[0023] Furthermore, heat dissipation holes are provided between the middle layers of the cord layer. The position of the deepest point of the shoulder heat dissipation hole is: draw a perpendicular line from the intersection of the outer surface of the crown 3 and the outer surface of the shoulder 4 to the inner surface of the cord layer 2 to obtain line L, the thickness of line L on the cord layer 2 is line M, and the midpoint A of line M is taken as the deepest point of the shoulder heat dissipation hole. The thickness of the cord layer 2 near the shoulder 4 is relatively uniform, and there is not much thickness difference. Therefore, the factors affecting heat dissipation are mainly on the tire body 1. Due to the requirements of the tire structure design, the intersection of the shoulder 4 and the crown 3 is approximately right-angled, and the internal cord layer 2 needs to be designed as an arc in conjunction with the inner tube, which makes the distance from the intersection of the shoulder 4 and the crown 3 to the inner tube the longest, thus becoming one of the thickest areas that hinder heat dissipation. Therefore, it is necessary to set heat dissipation holes at the thickest distance to dissipate heat. In order to ensure the structural strength of the cord layer 2 and avoid the influence of the heat dissipation holes on the inner tube, the middle position of the cord layer 2 is selected as the deepest point of the heat dissipation hole.

[0024] Furthermore, heat dissipation holes are provided between the middle layers of the cord layer. The drilling path of the shoulder heat dissipation holes is: starting from A and extending horizontally to the outer contour of the tire to obtain the intersection Q, then the line connecting Q and A is the drilling path of the shoulder heat dissipation holes. The drilling path extends from the horizontal direction to the predetermined thickest center point A. On the one hand, the horizontal direction is conducive to the construction personnel to grasp the drilling angle and avoid drilling angle errors. On the other hand, the external heat dissipation holes are located at the sidewall 5 to prevent impurities such as stones in the surrounding environment from getting stuck in the heat dissipation holes during driving, hindering the normal heat dissipation. At the same time, the structural strength of the tire is not damaged, so that the crown 3, shoulder 4 and other easily worn parts remain intact, extending the service life of the tire.

[0025] Furthermore, the distance from Q to the center axis of the tire is C, and heat dissipation holes are provided between the middle layers of the cord layer. The number of heat dissipation holes on the shoulder is E = [2πC / 50]. This formula is a rounding function equation. Punching requires taking an integer for the number of heat dissipation holes on the shoulder. The heat dissipation holes are evenly distributed along the 5 circumferences of the sidewall with the center axis of the tire as the center axis, and the heat dissipation holes are evenly distributed with the center axis as the symmetric center, which is conducive to evenly releasing the stress during use and avoiding the heat dissipation holes from affecting the overall structural strength of the tire.

[0026] Furthermore, heat dissipation holes are provided between the middle layers of the cord layer. The deepest point of the bead heat dissipation hole is: with the rim assembly line 7 as the reference point, a perpendicular line is drawn from the reference point to the inner surface of the cord layer 2 to obtain line O, the thickness of line O on the cord layer 2 is line P, and the midpoint B of line P is taken as the deepest point of the bead heat dissipation hole. For the bead 6 area, due to the design characteristics of the cord layer 2 itself, the closer to the bead 6 position, the thicker the cord layer 2 is. However, in actual use, at the bead 6 position, since the tire and the rim are not tightly bonded, a certain gap will be generated during driving, so that the cord layer 2 of the bead 6 part dissipates heat through the extrusion gap, and the metal rim itself has good heat dissipation performance. Secondly, most of the bead 6 part is inside the rim after assembly, and is not directly connected to the outside world. The heat dissipation hole does not have much heat dissipation effect. Therefore, it is only necessary to consider whether the cord layer 2 located outside the hub assembly line needs to be provided with heat dissipation holes. This application selects the rim assembly line 7 as the reference point, which is offset 10 mm from the periphery. The main purpose is to find the thickest position of the carcass layer 2 while maintaining the structural strength of the tire. After finding the thickest position, the midpoint of the carcass layer 2 is taken as the deepest point of the heat dissipation hole to avoid damage to the structure of the carcass layer 2 itself caused by drilling.

[0027] Furthermore, there are heat dissipation holes between the middle layers of the cord layer. The drilling path of the tire bead heat dissipation hole is: starting from B and extending horizontally to the outer contour of the tire to obtain the intersection R, then the line connecting R and B is the drilling path of the tire bead heat dissipation hole. The drilling path extends from the horizontal direction to the predetermined thickest center point B. On the one hand, the horizontal direction is conducive to the construction personnel to master the drilling angle and avoid drilling angle errors. On the other hand, since the tire bead heat dissipation hole is close to the rim assembly line 7, it is easy to cause the tire bead heat dissipation hole to be torn due to disassembly during the assembly and maintenance of the tire, thereby reducing the structural strength of the tire. The horizontal setting is far away from the rim assembly line 7, and the hole is drilled at the sidewall 5, which does not damage the structural strength of the tire, so that the easily worn parts close to the rim assembly line 7 remain intact, extending the service life of the tire.

[0028] Furthermore, the distance from R to the center axis of the tire is D, and heat dissipation holes are provided between the middle layers of the cord layer. The number of heat dissipation holes in the tire bead is F = [2πD / 50]. This formula is a rounding function equation. Punching holes requires taking an integer for the number of heat dissipation holes in the tire bead. The heat dissipation holes are evenly distributed along the 5 circumferences of the tire sidewall with the center axis of the tire as the center axis. The heat dissipation holes are evenly distributed with the center axis as the symmetry center, which is conducive to evenly releasing the stress during use and avoiding the heat dissipation holes from affecting the overall structural strength of the tire.

[0029] Furthermore, heat dissipation holes are provided between the middle layers of the cord layer, and the heat dissipation holes are conical heat dissipation holes drilled with a conical drill bit. The conical heat dissipation holes are conducive to rapid heat dissipation, and at the same time, the degree of damage to the structural strength of the internal cord layer 2 caused by the heat dissipation holes is reduced as much as possible. Preferably, the drilling marks of the confirmed Q points and R points are engraved on the outer tire mold, and the drilling marks and the tire body 1 are formed at one time through the mold, saving the measurement time required for the later drilling. The conical drill bit is clamped with an electric drill, and the drilling is carried out to the inside of the cord layer 2 according to the drilling mark hole position and the measured depth. Preferably, the root of the conical drill bit is ≤2mm.

[0030] Taking 18.00-25 port tire as the experimental object, a comparative experiment on the cord layer drilling was conducted, including a comparative experiment on a durability test machine and a comparative experiment on actual port use. The experimental results are as follows:

[0031] Experimental conditions Durability of the cord layer without heat dissipation holes / h Durability of cooling holes drilled in the cord layer / h Durability testing machine 78 118 Port of Gloria 3900 5600

[0032] Comparison table of durability measurement data and port usage data before and after the improvement of the heat dissipation holes:

[0033]

[0034]

[0035] Before the improvement, the cumulative durability time was 84 hours and the cumulative mileage was 427.47 kilometers. After the improvement, the cumulative durability time was 120 hours and the cumulative mileage was 598.61 kilometers. After the improvement, the durability hours increased by 43% and the durability mileage increased by 40%.

[0036] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A bias port tire, It is characterized in that It comprises a carcass and a cord layer arranged inside the carcass, wherein the carcass comprises a crown, a shoulder, a sidewall and a bead, the cord layer is cross-arranged and arranged in multiple layers, and a heat dissipation hole is arranged between the outer surface of the sidewall and the middle layer of the cord layer; The tire body is provided with a rim assembly line, the heat dissipation holes include tire bead heat dissipation holes, and the tire bead heat dissipation holes are arranged in an area close to the rim assembly line; The position of the deepest point of the tire bead heat dissipation hole is: taking the rim assembly line as the reference point and offsetting it by 10 mm to the outer periphery as the reference point, a perpendicular line is drawn from the reference point to the inner surface of the carcass layer to obtain line O, the thickness of line O on the carcass layer is line P, and the midpoint B of line P is taken as the deepest point of the tire bead heat dissipation hole.

2. A bias port tire according to claim 1, It is characterized in that The rim assembly line is arranged in a ring shape along the outer circumference of the tire bead.

3. A bias port tire according to claim 2, It is characterized in that The heat dissipation holes also include shoulder heat dissipation holes, and the shoulder heat dissipation holes are arranged in the shoulder area.

4. A bias port tire according to claim 3, It is characterized in that The position of the deepest point of the shoulder heat dissipation hole is: draw a perpendicular line from the intersection of the crown outer surface and the shoulder outer surface to the inner surface of the cord layer to obtain line L, the thickness of line L on the cord layer is line M, and the midpoint A of line M is taken as the deepest point of the shoulder heat dissipation hole.

5. A bias port tire according to claim 4, It is characterized in that The drilling path of the shoulder heat dissipation hole is: starting from A and extending horizontally to the outer contour of the tire to obtain the intersection Q, and the line connecting Q and A is the drilling path of the shoulder heat dissipation hole.

6. The bias port tire according to claim 5, It is characterized in that The distance from Q to the center axis of the tire is C, and the number of the shoulder cooling holes is E=[2πC / 50].

7. The bias ply tire according to claim 1, It is characterized in that The drilling path of the tire bead heat dissipation hole is: starting from B and extending horizontally to the outer contour of the tire to obtain the intersection R, and the line connecting R and B is the drilling path of the tire bead heat dissipation hole.

8. The bias ply tire according to claim 7, It is characterized in that The distance from R to the center axis of the tire is D, and the number of tire bead heat dissipation holes is F=[2πD / 50].

9. The bias ply tire according to claim 1, It is characterized in that The heat dissipation holes are conical heat dissipation holes drilled by a conical drill bit.

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