Tire bead structure of tire, tire, wheel with inner tube and wheel without inner tube

Abstract

The invention provides a bead structure of a tire, the tire, a wheel with an inner tube and a wheel without an inner tube. The bead structure comprises a steel wire ring and a bead body, the bead ring is arranged in the bead body, the bead body comprises a bead toe bottom surface, the axial inner side of the bead toe bottom surface comprises a bead toe tip, the axial outer side of the bead toe bottom surface forms a supporting surface, and the radial lowest point, close to the axial inner side, of the bead ring is perpendicular to the supporting surface to form a perpendicular point. A connecting surface is connected between the foot point and the bead toe tip, the radial size of the connecting surface is larger than that of the foot point, and the radial point of the bead toe tip is higher than that of the foot point. By reducing the size of bead toes and optimizing the size of the inner diameter, the matching degree of the inner diameter of the tire and the size of the outer edge of a rim is improved, the radial deformation required by the bead during assembly is reduced, the mounting resistance is greatly reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and particularly to a bead structure of a tire, a tire, a wheel with an inner tube, and a tubeless wheel that can improve the disassembly performance of the tire. Background Art

[0002] As a core component for a vehicle to contact the ground, the structure of a tire generally consists of a tread, a sidewall, and a bead. Among them, the tread is a wear-resistant layer in direct contact with the ground, the sidewall connects the tread and the bead and bears the lateral support function, and the bead, as the edge structure of the two axial openings of the tire, is the key part for the tire to be fitted with the rim. During the installation process, the rim is usually placed flat, and the bead on one side of the tire needs to be aligned with the outer edge of the rim. Since the diameter of the outer edge of the rim is larger than the inner diameter of the tire opening, the bead needs to be deformed radially outward to cross the outer edge of the rim to complete the assembly of one side; then the bead on the second side crosses the outer edge of the rim in a similar manner, and finally the tight fit between the tire and the rim is achieved.

[0003] In the prior art, the bead toe 100 of the bead of an inner tube tire usually adopts a single inclined surface design with an inclination angle of α1 (as Figure 1 shown). This structure results in a significant difference between the inner diameter of the tire and the actual size of the rim peak 110 of the rim 130, so that a large external force needs to be applied during the installation or disassembly process, which takes a long time. At the same time, the loading and unloading are likely to cause mechanical damage to the bead part, shortening the service life of the tire. On the other hand, although the design of the bead toe 100 of a tubeless tire adopts two inclined angles α2, α3 and sets an inflection point R at a short distance from the bead toe tip 120, and then extends in a parallel direction (0°) (as Figure 2 shown), the clearance size between its inner diameter and the rim 130 still has insufficient matching, resulting in a large assembly resistance and low operation efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above deficiencies in the prior art and provide a bead structure of a tire, a tire, a wheel with an inner tube, and a tubeless wheel that can improve the disassembly performance of the tire.

[0005] To solve the above technical problems, the present invention provides a bead structure of a tire, including a bead wire and a bead body; the bead wire is arranged in the bead body, the bead body includes a bead toe bottom surface, the axial inner side of the bead toe bottom surface includes a bead toe tip, a support surface is formed on the axial outer side of the bead toe bottom surface, the radial lowest point of the bead wire close to the axial inner side is perpendicular to the support surface to form a perpendicular foot point, a connection surface is connected between the perpendicular foot point and the bead toe tip, the radial dimension of the connection surface is larger than that of the perpendicular foot point, and the radial point of the bead toe tip is higher than the perpendicular foot point.

[0006] In a better embodiment, the radial difference between the bead toe tip and the foot point is greater than or equal to 1 mm and less than or equal to 5 mm.

[0007] In a better embodiment, the connecting surface extends from the foot point towards the bead toe tip towards the axially inner side and the radially outer side.

[0008] In a better embodiment, the connecting surface is a straight surface or a curved surface.

[0009] In a better embodiment, the connecting surface is an arc surface.

[0010] The present invention also provides a tire, including the bead structure of a kind of tire.

[0011] In a better embodiment, the tire is a radial tire.

[0012] The present invention also provides a wheel with an inner tube, including the above-mentioned tire;

[0013] The wheel further includes a rim, and the rim includes a rim outer edge and a rim support portion;

[0014] The rim support portion is located on the axially inner side of the rim outer edge. The rim support portion has a first support portion on the axially outer side and a second support portion on the axially inner side. The radial height of the second support portion is higher than the radial height of the first support portion; the support surface abuts against the first support portion, and the connecting surface abuts against the second support portion.

[0015] The present invention also provides a tubeless wheel, including the above-mentioned tire;

[0016] The wheel further includes a rim, and the rim includes a rim outer edge and a rim support portion;

[0017] The rim support portion is located on the axially inner side of the rim outer edge. The rim support portion includes a rim support surface extending along the axially inner side and the radially inner side. The support surface and the connecting surface abut against the rim support surface.

[0018] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0019] By reducing the bead toe volume and optimizing the inner diameter size, the matching degree between the inner diameter of the tire and the outer edge of the rim is improved. When assembling, the required radial deformation amount of the bead is reduced, the installation resistance is greatly reduced, and the operation efficiency is improved. The positioning of the foot point and the design of the radial dimension of the connecting surface form a stepped disengagement guide. When disassembling, the bead disengages from the rim along the support surface - connecting surface path in an orderly manner, avoiding local stress concentration, reducing the bead damage rate, and extending the service life of the tire. Description of the Drawings

[0020] Figure 1 is a combination diagram of the bead structure of a tubed tire and a rim in the prior art;

[0021] Figure 2 is a combination diagram of the bead structure of a tubeless tire and a rim in the prior art;

[0022] Figure 3 is a schematic diagram of the bead structure of a tubed tire in a preferred embodiment of the present invention;

[0023] Figure 4 is a combination diagram of the bead structure of a tubed tire and a rim in a preferred embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the bead structure of a tubeless tire in a preferred embodiment of the present invention;

[0025] Figure 6 is a combination diagram of the bead structure of a tubeless tire and a rim in a preferred embodiment of the present invention. Detailed implementation manners

[0026] The following further describes the present invention in conjunction with the drawings and specific implementation manners.

[0027] Refer to Figure 3 or Figure 5 , a bead structure of a tire, comprising a bead wire 1 and a bead body 2; the bead wire 1 is arranged inside the bead body 2, the bead body 2 includes a bead toe bottom surface 21, the axial inner side of the bead toe bottom surface 21 includes a bead toe tip 211, the axial outer side of the bead toe bottom surface 21 forms a support surface 212, the radial lowest point 11 of the bead wire 1 close to the axial inner side is perpendicular to the support surface 212 to form a perpendicular foot point 213, a connection surface 214 is connected between the perpendicular foot point 213 and the bead toe tip 211, the radial dimension of the connection surface 214 is larger than that of the perpendicular foot point 213, and the radial point of the bead toe tip 211 is higher than the perpendicular foot point 213.

[0028] By reducing the volume of the bead toe and optimizing the inner diameter dimension, the matching degree between the inner diameter of the tire and the outer edge 31 of the rim is improved, the required radial deformation amount of the bead during assembly is reduced, the installation resistance is greatly reduced, and the operation efficiency is improved.

[0029] The positioning of the perpendicular foot point 213 and the design of the radial dimension of the connection surface 214 form a stepped disengagement guide. When disassembling, the bead disengages from the rim 3 along the path of the support surface 212 - connection surface 214 in an orderly manner, avoiding local stress concentration, reducing the bead damage rate, and prolonging the service life of the tire.

[0030] In order to better demould the green tire during vulcanization, the radial difference h between the tire lip toe 211 and the vertical foot point 213 is greater than or equal to 1 mm and less than or equal to 5 mm.

[0031] In this embodiment, the connecting surface 214 extends from the perpendicular foot point 213 toward the tire bead tip 211 axially inward and radially outward to form an inclined surface. The connecting surface 214 is a straight surface or a curved surface, or the connecting surface 214 is an arc surface. In the straight surface solution, the connecting surface 214 is a linear inclined surface, which ensures that the tire bead tip 211 forms a smooth contact transition with the rim outer edge 31 during assembly, and the peak value of the assembly force is reduced. Curved surface / arc surface solution: The connecting surface 214 adopts a continuous arc surface. The arc surface configuration changes the contact trajectory of the tire bead when it is separated from the rim 3 from point contact to line contact, improves the uniformity of friction force distribution during the disassembly process, and reduces the wear on the tire bead surface.

[0032] The present invention also provides a tire, comprising the bead structure. More specifically, the tire is a radial tire.

[0033] See also Figure 3 and Figure 4 The present invention also provides a wheel with an inner tube, comprising the above-mentioned tire; the wheel also includes a rim 3, the rim 3 includes a rim outer edge 31 and a rim support portion 32; the rim support portion 32 is located on the axial inner side of the rim outer edge 31, the rim support portion 32 is located on the first support portion 321 on the axial outer side and the second support portion 322 on the axial inner side, the radial height of the second support portion 322 is higher than the radial height of the first support portion 321; the support surface 212 is supported on the first support portion 321, and the connecting surface 214 is supported on the second support portion 322.

[0034] See also Figure 5 and Figure 6 The present invention also provides a tubeless wheel, comprising the tire; the wheel also comprises a rim 3, the rim 3 comprises a rim outer edge 31 and a rim support portion 32; the rim support portion 32 is located on the axial inner side of the rim outer edge 31, the rim support portion 32 comprises a rim support surface 323 extending along the axial inner side and the radial inner side, the support surface 212 and the connecting surface 214 are supported on the rim support surface 323.

[0035] Experimental verification:

[0036] The following is the experimental verification and comparison of the specific implementation methods of the present invention.

[0037] To verify the loading and unloading performance and various properties of the tire with the invention's bead structure, the test objects were respectively selected as tubed 7.50R16 specification and tubeless 12R22.5 specification pneumatic radial tires for load carrying with steel belt layers and steel carcass layers. Two tires of each specification were selected, one as the comparison tire: the current bead design structure, and the other as the test tire: designed according to the specific implementation manner of the present invention.

[0038] Example 1: For the test tire of 7.50R16 specification, the radial lowest point 11 of the bead wire 1 near the axial inner side is perpendicular to the perpendicular point 213 on the bead toe bottom surface 21. From the perpendicular point 213, there is a connecting surface 214 inclined upward intersecting the bead toe tip 211. The radial point of the bead toe tip 211 is higher than the perpendicular point 213. The radial difference h between the bead toe tip 211 and the perpendicular point 213 is 1.2 mm. The upward inclined surface from the perpendicular point 213 to the bead toe tip 211 is a straight surface.

[0039] Two finished tires with the same formula, material, and different bead structures were selected, namely comparison tire 1 and Example 1.

[0040] Evaluation items:

[0041] 1. Finished product weight: Weighing was carried out using a unified weighing tool.

[0042] 2. Loading and unloading tire test: Time records were made for a single person to operate the tire loading and unloading.

[0043] 3. Bead durability running test: Running in pairs was carried out at the same speed and load for a unified time.

[0044] 4. Bead pressure test: Bead pressure test was carried out at 100% load.

[0045] The evaluation results are as follows:

[0046] Evaluation Items Control Tire 1 Example 1 Example 1 / Control Tire 1 Finished Product Weight (kg) 100％ 95％ ↓5％ Tire Fitting Time (s) 100％ 44％ ↓56％ Tire Removal Time (s) 100％ 44％ ↓56％ Bead Durability Running (km) 100％ 118％ ↑18％ Bead Pressure (kPa) 100％ 100％ Equivalent

[0047] Experimental data shows that the finished product weight of Example 1 is reduced, the bead pressure is comparable, the bead durability performance is improved by 18%, the tire loading and unloading time is significantly shortened, and the overall loading and unloading efficiency is improved.

[0048] Example 2: For the test tire of 12R22.5 specification, the radial lowest point 11 of the bead wire 1 near the axial inner side is perpendicular to the perpendicular point 213 on the bead toe bottom surface 21. From the perpendicular point 213, there is a connecting surface 214 inclined upward intersecting the bead toe tip 211. The radial point of the bead toe tip 211 is higher than the perpendicular point 213. The radial difference h between the bead toe tip 211 and the perpendicular point 213 is 1.2 mm. The upward inclined surface from the perpendicular point 213 to the bead toe tip 211 is a straight surface.

[0049] We selected two finished tires with the same formula and material but different bead structures, namely Comparative Tire 2 and Example 2.

[0050] Evaluation items:

[0051] 1. Finished product weight: Weigh with a unified weighing tool.

[0052] 2. Mounting and dismounting tire test: Record the time taken for a single person to mount and dismount the tire.

[0053] 3. Bead durability test: Run in pairs at the same speed and load for a unified time.

[0054] 4. Bead pressure test: Conduct bead pressure test at 100% load.

[0055] The evaluation results are as follows:

[0056] Evaluation Items Control Tire 2 Example 2 Example 2 / Control Tire 2 Finished Product Weight (kg) 100％ 96％ ↓4％ Tire Fitting Time (s) 100％ 31％ ↓69％ Tire Removal Time (s) 100％ 29％ ↓71％ Bead Durability Running (km) 100％ 124％ ↑24％ Bead Pressure (kPa) 100％ 100％ Equivalent

[0057] The experimental data show that the finished product weight of Example 2 is reduced, the bead pressure is comparable, the bead durability performance is improved by 24%, and the tire mounting and dismounting time is significantly shortened, resulting in an overall improvement in the mounting and dismounting efficiency.

[0058] In summary, according to the embodiments of the present invention, by inventing the bead structure, the diameter point of the bead toe 21121 is higher than the foot point 21323, and the upward inclined surface from the foot point 213 to the bead toe 211 is a straight surface design, which can reduce the use of bead rubber, reduce the tire weight, and improve the bead durability performance; it can also increase the inner diameter of the tire, shorten the tire mounting and dismounting time, and further improve the tire mounting and dismounting performance.

[0059] The above is only a preferred specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention who makes non-substantive modifications to the present invention using this concept shall fall within the scope of infringement of the present invention.

Claims

1. A tire bead structure, characterized in that: It includes a wire ring and a tire bead body; the wire ring is arranged in the tire bead body, the tire bead body includes a tire bead toe bottom surface, the axial inner side of the tire bead toe bottom surface includes a tire bead toe tip, the axial outer side of the tire bead toe bottom surface forms a support surface, the radial lowest point of the wire ring close to the axial inner side is perpendicular to the support surface to form a perpendicular foot point, a connecting surface is connected between the perpendicular foot point and the tire bead toe tip, the radial size of the connecting surface is larger than the perpendicular foot point, and the radial point of the tire bead toe tip is higher than the perpendicular foot point.

2. A tire bead structure according to claim 1, characterized in that: The radial difference between the bead toe tip and the perpendicular foot point is greater than or equal to 1 mm and less than or equal to 5 mm.

3. A tire bead structure according to claim 1, characterized in that: The connecting surface extends from the perpendicular foot point toward the tire bead tip toward the axial inside and the radial outside.

4. A tire bead structure according to claim 3, characterized in that: The connecting surface is a straight surface or a curved surface.

5. The tire bead structure of claim 3, characterized in that: The connecting surface is a curved surface.

6. A tire, characterized in that: A tire bead structure comprising the tire as claimed in any one of claims 1 to 5.

7. A tire according to claim 6, characterized in that: The tire is a radial tire.

8. A wheel with an inner tube, characterized in that: A tire comprising a tire as claimed in claim 6 or 7; The wheel also includes a rim, the rim including a rim outer edge and a rim support portion; The rim support portion is located on the axial inner side of the rim outer edge, and the rim support portion includes a first support portion located on the axial outer side and a second support portion located on the axial inner side, wherein the radial height of the second support portion is higher than the radial height of the first support portion; the support surface is supported by the first support portion, and the connection surface is supported by the second support portion.

9. A tubeless wheel, characterized in that: A tire comprising a tire as claimed in claim 6 or 7; The wheel also includes a rim, the rim including a rim outer edge and a rim support portion; The rim support portion is located axially inside the outer edge of the rim, and includes a rim support surface extending along the axial inside and the radial inside, and the support surface and the connecting surface are supported on the rim support surface.

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