CN110901300A

CN110901300A - A bicycle tubeless tire and its bicycle

Info

Publication number: CN110901300A
Application number: CN201911298884.2A
Authority: CN
Inventors: 田志伟; 原五星; 赵彬
Original assignee: JIANGSU SEYOUN TIRE CO Ltd
Current assignee: JIANGSU SEYOUN TIRE CO Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-03-24

Abstract

The invention discloses a bicycle vacuum tire and a bicycle thereof, and belongs to the field of bicycles. The invention discloses a vacuum tire for a bicycle, which comprises a hub and a vacuum tire arranged on the hub, wherein the vacuum tire comprises a cord fabric layer, a bead core and an air-retention rubber layer arranged on the inner side or the outer side of the cord fabric layer; the cord fabric layer turns back around the bead core, the bead core corresponds to the tire bead part of the vacuum tire, and the tire bead is covered by the air-retention rubber layer; the convex section C1 on the tire lip protrudes outwards, the intersection point of the tangent line of the outermost end of the convex section in the Y direction and the extension line of the inclined heel is an RD point, the distance d2 between the inner wall of the tire bead core and the axis of the vacuum tire is not less than the dimension d1 between the RD point and the axis of the vacuum tire, and the difference is 0-1.4 mm. According to the vacuum tire for the bicycle, the tire lip part can be tightly attached to the rim surface, and the air retention of the vacuum tire is improved.

Description

Bicycle vacuum tire and bicycle thereof

Technical Field

The invention relates to the technical field of bicycles, in particular to a bicycle vacuum tire and a bicycle thereof.

Background

Bicycles are two-wheeled small land vehicles. The bicycle is a green and environment-friendly vehicle and also a tool capable of experiencing riding pleasure.

The existing bicycle tire mainly comprises three structures: common bicycle tires comprising an inner tube and an outer tire, solid tires currently used in some shared bicycles, and vacuum tires without inner tubes.

The bicycle vacuum tire is a high-end product of the tire used by the bicycle, and has higher requirements on the air tightness and the easiness in assembly of the tire. As is well known, vacuum tires are applied more in the field of automobiles and have better effects, and electric vehicles also begin to adopt the vacuum tires, but because the weight difference between the automobile and the electric vehicle and that between the bicycle are larger, the wheel structure is completely different from that of the bicycle wheel, so the existing vacuum tires cannot be applied to the bicycle.

The air tightness is a great problem faced by bicycles, and because the weight of automobiles and electric vehicles is large and the tires are thick and heavy, the air tightness has a better effect on maintaining the pressure of the tires under the gravity of the automobiles and the electric vehicles. However, for bicycles, the requirement for light weight is high, the bicycle tire cannot be too heavy and too thick, and because of its light weight, it is difficult to improve the sealing by its own weight to prevent air leakage. Particularly, for bicycles with high requirements for light weight, the bicycle is more difficult to be combined with a vacuum tire to meet the requirement of air tightness. Although the prior vacuum tire can still be normally used after being used for a certain time, the prior vacuum tire can be inflated once in less than one month, which is troublesome and has a short airtight period. Therefore, how to improve the air tightness of the vacuum tire is a big problem to be faced at present.

With respect to the vacuum tire technology, there are solutions disclosed in the prior art, such as a bicycle vacuum tire and a bicycle (application No. 201821025765.0), which are only mentioned to the vacuum tire in general and described from the external mounting structure, but there is no description about the specific structure of the vacuum tire and no suggestion on how to design the related air tightness.

In addition, for a high-end bicycle, the requirements for speed and light weight are high, and the vacuum tire can run at high speed due to the unique performance, but the weight of the vacuum tire is also a great problem to be faced at present. When a vacuum tire is used to replace the existing inner tube and outer tire, the tire seems to be lighter due to the lack of the inner tube, but in fact, the tire wall and the tire tread of the vacuum tire are much thicker in order to ensure the sealing and wear resistance of the bicycle, and the vacuum tire may be heavier if no better material and technology is available.

In order to achieve light weight, the materials are mainly improved greatly at present, and high-quality light materials are provided, so that the vacuum tire bicycle in the market is expensive.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defect of poor air tightness of a bicycle vacuum tire in the prior art, and provides a bicycle vacuum tire and a bicycle thereof. According to the vacuum tire for the bicycle, the tire lip part can be tightly attached to the rim surface, and the air retention of the vacuum tire is improved.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention discloses a vacuum tire for a bicycle, which comprises a hub and a vacuum tire arranged on the hub, wherein the vacuum tire comprises a cord fabric layer, a bead core and an air-retention rubber layer arranged on the inner side or the outer side of the cord fabric layer; the cord fabric layer turns back around the bead core, the bead core corresponds to the tire bead part of the vacuum tire, and the tire bead is covered by the air-retention rubber layer;

the tire bead of the vacuum tire is composed of a convex section C1 and a concave arc section C2 in a cross-sectional structure, the bottom of the tire bead is a tire heel, and the tire heel, the convex section C1 and the concave arc section C2 are sequentially connected to form a matching part with a wheel rim on a wheel hub; the convex segment C1 protrudes outwards, the intersection point of the tangent line of the outermost end of the convex segment in the Y direction and the extension line of the inclined heel is an RD point, the distance d2 from the inner wall of the bead core to the axis of the vacuum tire is not less than the dimension d1 from the RD point to the axis of the vacuum tire, and the difference value is 0-1.4 mm.

As a further improvement of the invention, the bead heel of the bead is of a linear structure in the cross-sectional structure, and the inclined included angle of the bead heel and the X direction is 3-20 degrees.

As a further improvement of the invention, the air-retention rubber layer is arranged outside the cord fabric layer and covers the tire side part or forms full-face rubber to cover the tire side part and the tire lip.

As a further improvement of the invention, the middle area of the cord fabric layer is provided with a tread rubber layer to form a crown; the tread rubber layer and the air-retaining rubber layer are of an integral structure or are formed by splicing.

As a further improvement of the invention, the air-retaining rubber layer is arranged on the inner side of the cord fabric layer to form an inner liner which is folded outwards around the bead core and covers the bead lip.

As a further improvement of the invention, the air-retaining rubber layer is formed by processing the same material or by combining different rubber materials.

The invention provides a bicycle, wherein a wheel of the bicycle comprises a hub and a vacuum tire, the vacuum tire is as claimed in any one of claims 1-6, and the vacuum tire is matched with a rim of the hub.

As a further improvement of the invention, the rim comprises a rim connecting part in the middle and rim mounting parts at two ends, the rim mounting parts are mainly formed by sequentially connecting a sealing section L1, a sealing section L2 and a pressing section L3, an included angle of 90-110 degrees is formed between the sealing section L1 and a mounting surface of the sealing section L2, and the pressing section L3 is recessed towards the inner side of the sealing section L2 to form a step; the heel of the vacuum tire is matched with a mounting surface of the sealing section L1, the convex section C1 is matched with a mounting surface of the sealing section L2, and the concave arc section C2 is matched with a mounting surface of the pressing section L3.

As a further improvement of the invention, the width w of the tire bead is not more than the width h of the rim mounting part, and the difference is 0-1 mm.

As a further improvement, the pneumatic sealing device further comprises an inner rim air sealing ring which is arranged at the rim connecting part and used for sealing the spoke hole on the rim.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) according to the vacuum tire, the position of the bead core is limited by controlling the distance difference between the RD point and the bead core, so that enough adhesive film is covered on the heel part, and the adhesive film thickness between the vacuum tire and a rim can be enough, so that the air tightness is ensured, and the air-tightness of the vacuum tire is improved.

(2) According to the bicycle, the wheel rim adopts the vacuum tire rim, the structure of the vacuum tire rim is improved in adaptability, the vacuum tire rim still has good air retention after being used for a long time, the weight is light, frequent inflation is not needed, the structural design is reasonable, the principle is simple, and the popularization and the use are convenient.

Drawings

FIG. 1 is a schematic view of a vacuum tire;

FIG. 2 is a schematic view of the bead structure of section A of FIG. 1;

FIG. 3 is a schematic view of the location dimensions of the RD point and the bead core;

FIG. 4 is a schematic view of a full-face cement structure of a unitary structure;

FIG. 5 is a schematic view of a side rubber and a tread rubber layer engaging structure;

FIG. 6 is a schematic representation of an embodiment of the innerliner and ply;

FIG. 7 is a schematic view of another embodiment of a ply;

fig. 8 is a schematic view of the structure of the rim.

The reference numerals in the schematic drawings illustrate: 10. a crown; 11. tire shoulders; 12. a sidewall portion; 13. a fetal lip; 14. a heel of a fetus; 20. a tread rubber layer; 21. side glue; 30. an airtight layer; 40. a ply layer; 41. a single layer of screen; 42. an inner layer of screen cloth; 43. an outer layer screen layer; 50. a bead core; 51. a single-stranded core wire; 60. a seam allowance protective adhesive; 70. a security thread.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.

With reference to fig. 1, the vacuum bicycle tire of the present embodiment includes a tread rubber layer 20, a ply 40 and a bead core 50, wherein the ply 40 is supported by the bead core 50, and the bead core 50 corresponds to the bead lip 13 of the vacuum tire. A tread band 20 is disposed outwardly of the ply 40 to form the tread cap 10.

The tread rubber layer 20 covers the middle area of the cord fabric layer 40 and forms a tire crown 10, and the tire shoulder 11 is the part where the two ends of the tire crown 10 are connected with the cord fabric layer 40. In this embodiment, the tread rubber layer 20 may be used as an air-retention rubber layer to extend and cover the sidewall 12, and form rubber layers at the bottom and the outer side of the bead 13, that is, form a rubber film at the bottom and the outer side of the sidewall 12 and the bead 13 for attaching to a rim, so as to provide a certain air-tightness and achieve an air-retention effect.

Referring to fig. 2, as an embodiment of a bead structure of a vacuum tire, a bead 13 of the vacuum tire is composed of a convex section C1 and a concave arc section C2, in a cross-sectional structure, the bottom of the bead 13 is a bead heel 14, and the bead heel 14, the convex section C1 and the concave arc section C2 are connected in sequence to form a fitting part with a rim, and the fitting part is covered with a rubber layer. After installation, the rubber layer in the matching part is matched with the wheel rim to form a seal. The cross-sectional structure referred to herein is a cross-section obtained by radially cutting the vacuum tire to facilitate description and definition of the internal structure of the vacuum tire.

In practice, the heel 14 will generally be inclined with respect to the direction X, with its ends connected, preferably smoothly, to the raised segments C1, forming a single body. The convex section C1 may be an arc or a straight line section in the middle, and is not particularly limited. The concave arc section C2 is formed into a concave structure and is in transition connection with the convex section C1.

Preferably, the bead heel 14 may have a linear structure in cross section, and the inclination angle of the bead heel 14 to the X direction may be controlled to be 3 ° to 20 °, further 8 ° to 15 °, for example, 10 ° or 13 °. The inclined included angle needs to be designed according to the rim.

With reference to fig. 3, the convex segment C1 is a convex arc structure, the intersection point of the tangent line of the outermost end in the Y direction and the extension line of the inclined heel 14 is RD point, the distance d2 from the inner wall of the bead core 50 to the axis of the vacuum tire is not less than the dimension d1 from the RD point to the axis of the vacuum tire, and the difference is 0-1.4 mm.

In the case of the determined shape of the tire lip, the position of the RD point is determined, and the smaller the difference between d2 and d1, the smaller the thickness of the rubber layer which can be accommodated, and the rubber film plays a role in sealing. Also, due to the heel tilt, if d2 is less than d1, there will be insufficient rubber to contain enough rubber to seal.

In one embodiment, the difference between d2 and d1 is 0-0.5 mm, for example, the inclined angle is 8 degrees, and the difference between d2 and d1 is 0.3mm, on the basis that the inclined angle of the heel 14 to the X direction is 5-20 degrees; the included angle of inclination is 10 deg., and d2 is equal to d 1.

In combination with the above structure, the bead core 50 of the present embodiment may employ a bead ring of a conventional single ring structure, and be supported by the bead ring, and satisfy the above-described limitation. As other embodiments, the bead core 50 may also be formed of a plurality of steel wire loops.

With reference to fig. 2 and 3, as another embodiment, the bead core 50 is formed by continuously winding the single-strand core 51 for at least 3 turns, and since the single-strand core 51 is continuous, there is only one joint in this embodiment, and at the position of the joint, the other two turns are still continuous, so that even if a step difference occurs, the overall structural strength is not affected, and thus, better air retention can be provided, and the service life of the tire is prolonged.

Further, in the present embodiment, it is required that the bead core 50 is surrounded by the single cord 51 for not less than 2 turns on the side close to the bead heel 14, and in the cross-sectional structure of fig. 2, the single cord 51 has two turns on the left and right, which are formed by 1 single cord 51.

One function of the bead core 50 is to press the bead heel surface against the rim, so that a seal is formed between the rubber layer on the bead heel and the mounting surface of the rim, and the multi-turn structure of the single-strand core 51 can form a larger pressing surface on the side close to the bead heel 14, thereby improving the sealing effect.

As an embodiment of the single-strand core wire 51, it can be a single-strand steel wire or a single-strand fiber wire, and its diameter is generally 0.6-1.0 mm, for example, 0.7m, 0.75mm, 0.85mm, 0.95mm, etc.

The "single strand" referred to in the present embodiment means that the bead core 50 is regarded as one strand of the multi-turn structure, and the single strand core 51 may be a single thread or a combination of multiple threads. For example, a single strand of steel wire, which may be formed from one steel wire; or may be formed from a plurality of filaments, for example three filaments twisted to form a single strand of steel.

When a fiber ring is adopted, the fiber ring can be Kevlar fiber; can be fiber with stronger tensile strength and high modulus, and the carbon fiber or aramid fiber is mutually entangled to form the twisted wire. The fiber loop is formed by combining a plurality of strands of fiber twisted wires to form a single-strand core wire.

As a further modification, the number of the single-strand wires 51 is gradually reduced toward the side away from the bead heel 14. For example, when 3 turns of the single-stranded core wire 51 are used, the bottom has 2 turns, the upper layer has 1 turn, and the base is located between the 2 turns to form an equilateral triangle structure. When 6 single-stranded core wires 51 are used, the bottom most portion has 3 turns, the middle portion has 2 turns, and the top layer has 1 turn, and likewise, an equilateral triangular structure is formed.

With the above structure, on one hand, the strength of the supporting force provided is considered, and on the other hand, at the joint position, a certain amount of overlap between the end and the beginning of the single-strand core 51 can be achieved. In the structure, because the bottom is large, the wire ends of the single-stranded core wires 51 which are overlapped at the excessive positions can have an accommodating space, and the cord fabric layer cannot be excessively expanded, so that enough space can be provided for accommodating the rubber layer, and the rubber layer cannot be too thin to play a role in air retention.

Further, the end of the single-stranded core wire 51 has an overlapping margin of 70 to 150mm with respect to the starting end, and within this range, it can be selected as required, for example, set to be 100mm, 120mm, and the like, without specific limitation. The joint of the bead core can be connected together by slurry cloth bundling or bonding and the like.

Further, a gas-retaining rubber layer inside or outside the ply 40.

In one embodiment of the air-retention rubber layer, it is provided outside the carcass layer 40 so as to cover the sidewall 12.

With reference to fig. 4, it can be understood that the sidewall 12 is provided with the side rubber, and the side rubber 21 can be formed at the same time as the tread rubber layer, i.e., as an integral structure with the tread rubber layer 20, and processed at the same time. The side rubber covers the sidewall and bead side portions, and the bead heel at the bead bottom. Further, the tread rubber layer 20 corresponding to the tread cap may be made of an additional rubber layer to enhance its wear resistance.

In connection with fig. 5, it is also possible to provide the side glue 21 separately. The requirement of the tire crown part on wear resistance is high, the requirement of the side part on crack resistance and air retention is high, and different materials can be used for matching and processing in the mode to form a better scheme. In this structure, the bead protection rubber 60 at the bead portion may be integrated with the side rubber 21 or may be additionally processed, and the bead protection rubber 60 is mainly located at the bead portion below the safety line 70.

As another embodiment of the air-retention rubber layer, the air-retention rubber layer is provided inside the ply 40 to form the inner liner 30, and the inner liner 30 is folded back outward around the bead core 50. The airtight layer 30 can ensure good sealability.

In order to better match the structure of the inner liner, a bead protection rubber 60 is provided on the outer side of the bead 13 of the vacuum tire, and the bead protection rubber 60 covers the folded end of the inner liner 30.

In the present embodiment, when the inner liner is wrapped outward, the end portion of the inner liner 30 is folded back to the outside of the bead lip 13 around the bead core 50 and covered with the bead filler 60. The bead filler 60 extends upward from the end of the bead heel 14 to close the end of the innerliner between itself and the carcass ply, improving air tightness.

Further, the bead protection rubber 60 at the bead portion forms a convex section C1 and a concave arc section C2 for fitting with the rim. After the installation, can form the multiple spot seal in the area of child heel 14, protruding section C1 and concave arc section C2 of indent, better guarantee the gas tightness.

As an embodiment of the air barrier, it may be made of the same material as the seam allowance rubber, and may be made of rubber, or may be made by embedding rubber in fiber or textile. Embedding means that the gaps between the fibers or textiles are filled with rubber.

In this embodiment, the tread rubber layer 20 covers the middle region of the ply layer 40 to form a crown 10, and the tire shoulder 11 is the part where the two ends of the crown 10 are connected with the ply layer 40. In this embodiment, since the tread rubber layer 20 is only provided at the crown and shoulder portions, the portion between the bead and the shoulder of the tire has no tread rubber, that is, the area of the sidewall portion 12 has no tread rubber added again, so that the tire weight can be reduced. The ply 40 itself is sized by embedding a gel in the woven material or fibers, and the ply 40 itself is of a gel material.

Since the sidewall portion has no tread rubber, the overall mass is reduced, but its air retention may be problematic, which is one reason why many vacuum tires are currently large in mass. In this embodiment, bead protection rubber 60 is disposed at the bead 13, and the bead protection rubber 60 may be rubber, so that after installation, a better sealing effect can be achieved between the rubber and the rim.

As an embodiment of the crown 10, the shoulders 11 are formed at the ends thereof, and the thickness of the shoulders 11 may be greater than the thickness of the crown 10, at least in the central region of the crown. In this structure, can form great contact surface, form flat structure, increase the power of grabbing.

Various tread patterns may be formed in the tread cap 10 during use, and these patterns may be used to increase friction, drainage, etc. The pattern to be provided may be a continuous pattern or a discontinuous pattern, and the pattern is provided symmetrically along the center line in the circumferential direction of the tire.

Referring to fig. 6, as a specific embodiment of the ply, the ply 40 is formed by a single layer of cord fabric 41 folded around bead cores 50 at both ends, and the ends of the single layer of cord fabric 41 form a partial overlapping area to form a complete loop. In the two end positions, the ply 40 comprises two layers of cords 41, and in the central overlapping region, three layers of cords 41. The ply 40 itself is sized by embedding a gel in the woven material or fibers, and the ply 40 itself is of a gel material.

In connection with fig. 7, as another embodiment of the ply, two layers of cords are folded back around each other and are superposed. Wherein, the both ends of the inner layer cord layer 42 are folded back upwards around the bead core 50, the both ends of the outer layer cord layer 43 are folded back downwards around the bead core 50, and the inner layer cord layer 42 is wrapped while surrounding the bead core, and in the structure, the cord layers contained in the cord fabric layer are two layers, and 4 layers are formed in the bead lip area. The inner liner is arranged in the same arrangement as the inner layer of screen 42, and the ends of the outer layer of screen 43 are pressed and covered.

It should be noted that when two layers of cords are used, the ends of the two layers of cords generally do not extend beyond the bead area for weight reduction purposes, thereby avoiding an increase in the thickness of the sidewall portion 12.

On the basis of the vacuum tire, the invention also provides a bicycle, wherein the wheel of the bicycle comprises a hub and the vacuum tire, and the adopted vacuum tire is the vacuum tire in the embodiment or the combination thereof. The adopted hub comprises a spoke and a rim which are connected, and the vacuum tire is matched with the rim of the hub to meet the use requirement.

Further, referring to fig. 8, the rim 80 includes a rim connecting portion 81 in the middle and rim mounting portions 82 at both ends, the rim connecting portion 81 and the rim mounting portions 82 are integrally formed, and the outer side of the rim connecting portion 81 is connected to the spoke. The rim mounting part 82 is mainly formed by sequentially connecting a sealing section L1, a sealing section L2 and a pressing section L3, and an included angle of 90-110 degrees is formed between the sealing section L1 and the mounting surface of the sealing section L2 and is in transition connection through an arc. For example, if the sealing section L1 has a certain upward inclination angle, the sealing section L2 may be vertical, so that an obtuse angle can be formed. The specific angle can be matched with the inclined included angle of the bead heel, and the specific angle and the inclined included angle can be the same or matched according to a corresponding relation, so that the sealing effect is achieved.

The pressing section L3 is recessed toward the inside of the sealing section L2 to form a step. The width of the step relative to the sealing section L2 is no less than 1/6 the width of the sealing section L1.

The heel 14 of the vacuum tire is matched with the mounting surface of the sealing section L1, the convex section C1 is matched with the mounting surface of the sealing section L2, and the concave arc section C2 is matched with the mounting surface of the stitching section L3. By utilizing the structure, three sections of sealing are formed, and the sealing surfaces are mutually matched by utilizing the concave-convex structure of the structure, so that the air tightness effect is greatly improved.

The width w of the bead 13 is not greater than the width h of the rim mounting part 82, and the difference is 0-1 mm, so that the tire is prevented from knocking over.

In addition, the rim 80 further comprises an inner rim air-tight ring 83, the inner rim air-tight ring 83 being arranged at the rim connecting portion 81 for sealing against the rim 80. Spokes are mounted on the rim connecting part 81, and the spoke mounting holes can be blocked through the inner rim airtight ring 83 to form sealing.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. A bicycle tubeless tire, comprising a wheel hub and a tubeless tire mounted on the wheel hub, characterized in that: the tubeless tire comprises a ply (40), a bead core (50) and a tire provided on the ply (40) An inner or outer air-retaining rubber layer; the ply (40) is folded around a bead core (50), the bead core (50) corresponding to the bead (13) of the tubeless tire, the bead (13) ) is covered by a gas-retaining rubber layer;

The bead (13) of the tubeless tire is composed of an outwardly convex convex segment C1 and an inwardly concave concave arc segment C2 in a cross-sectional structure, and the bottom of the bead (13) is a tire butt (14), the (14) The convex segment C1 and the concave arc segment C2 are connected in sequence to form a fitting part with the rim (80) on the hub; the convex segment C1 protrudes outward, and the tangent and inclination of its outermost end in the Y direction The intersection point of the extension line of the tire heel (14) is the RD point, the distance d2 between the inner wall of the bead core (50) and the tubeless tire axis is not less than the dimension d1 between the RD point and the tubeless tire axis, and the difference is 0～ 1.4mm.

2. A bicycle tubeless tire according to claim 1, characterized in that: the butt (14) of the bead (13) is a linear structure in the cross-sectional structure, and the inclined angle between the tire bead (13) and the X direction is 3 °～20°.

3. A bicycle tubeless tire according to claim 1, characterized in that: the air-holding rubber layer is arranged on the outer side of the ply (40) to cover the sidewall portion (12), or form a full-face rubber to cover the tire Side (12) and bead (13).

4. A bicycle tubeless tire according to claim 3, characterized in that: a tread rubber layer (20) is arranged in the middle area of the ply (40) to form a tread crown (10); the tread rubber layer (20) ) and the gas-retaining rubber layer are integrally formed or formed by splicing.

5. A bicycle tubeless tire according to claim 1, characterized in that: the air-holding rubber layer is provided on the inner side of the ply (40) to form an airtight layer (30), and the airtight layer (30) bypasses The bead core (50) is folded back outward and covers the bead (13).

6. A bicycle tubeless tire according to any one of claims 3 to 5, characterized in that: the air-holding rubber layer is formed by processing the same kind of material or by combining different rubber materials.

7. A bicycle, the wheel of which comprises a hub and a tubeless tire, wherein the tubeless tire is the tubeless tire according to any one of claims 1 to 6, and the tubeless tire is matched with a rim (80) of the wheel hub.

8 . The bicycle according to claim 7 , wherein the rim ( 80 ) comprises a rim connecting portion ( 81 ) in the middle and rim mounting portions ( 82 ) at both ends, and the rim mounting portions ( 82 ) It is mainly composed of the sealing section L1, the sealing section L2 and the pressing section L3 connected in sequence. The sealing section L1 and the mounting surface of the sealing section L2 form an included angle of 90° to 110°, and the pressing section L3 faces the inner side of the sealing section L2. The butt (14) of the tubeless tire fits on the mounting surface of the sealing segment L1, the convex segment C1 fits on the mounting surface of the sealing segment L2, and the concave arc segment C2 fits on the mounting surface of the pressing segment L3.

9 . The bicycle wheel according to claim 8 , wherein the width w of the bead ( 13 ) is not greater than the width h of the rim mounting portion ( 82 ), and the difference is 0˜1 mm. 10 .

10. A bicycle according to claim 8, characterized in that it further comprises an inner rim airtight ring (83), and the inner rim airtight ring (83) is arranged on the rim connecting part (81) for aligning the rim (83). 80) to seal the spoke holes.