CN211730938U

CN211730938U - Vacuum tyre for bicycle

Info

Publication number: CN211730938U
Application number: CN201922276624.7U
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: 2020-10-23
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses a bicycle vacuum child belongs to bicycle tire field. The utility model discloses a bicycle vacuum tire, including tread rubber layer, casing ply and bead core, the casing ply pass through the bead core support, the tread rubber layer is established in the casing ply outside and forms the crown; the tire further comprises an airtight layer and seam allowance protective glue, wherein the airtight layer covers the inner surface of the cord fabric layer; the bead mouth protective rubber is arranged at the bead part of the cord fabric layer. The bicycle vacuum tire in this scheme, the difficult segment difference that takes place of bead core can provide sufficient holding power for a long time, has improved the air protection of vacuum tire. The bicycle adopting the vacuum tire has light weight and long service life.

Description

Vacuum tyre for bicycle

Technical Field

The utility model relates to a bicycle tire technical field, more specifically say, relate to a bicycle vacuum child.

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 vacuum tire mainly comprises three structures: the vacuum tyre of the common bicycle comprises an inner tyre and an outer tyre, a solid tyre partially shared by the bicycle at present, and a vacuum tyre without the inner tyre.

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 easy assembly of the tire. As is well known, vacuum tires are widely applied in the field of automobiles and have good effects, and electric vehicles also begin to adopt vacuum tires, but are rarely applied to bicycles.

The vacuum tire has small resistance and can run at high speed. 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.

The air tightness is a great problem faced by bicycles, and because the weight of automobiles and electric vehicles is large, the air tightness has a better effect on tire pressure maintaining under the gravity of the automobiles and the electric vehicles. However, for bicycles, it is difficult to improve the sealing against air leakage by its own weight because of its small weight. In particular, it is more difficult to combine the vacuum tire with a bicycle requiring a high weight reduction. Although the existing vacuum tire can be normally used, the tire is inflated once in less than one month, which is troublesome and has a short airtight period.

For high-end bicycles, 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 a great problem at present. 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.

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.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

An object of the utility model is to overcome among the prior art bicycle vacuum child and be difficult to reach the not enough of higher gas tightness, provide a bicycle vacuum child. The utility model discloses a setting that airtight layer, rim of a river protection were glued has improved the gas tightness, has longer gas retention nature.

Further, the utility model provides a current tire be difficult to lightweight problem, through the improvement to side portion structure, the side portion does not have the tread rubber, reaches the lightweight purpose.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a bicycle vacuum tire, including tread rubber layer, casing ply and bead core, the casing ply pass through the bead core support, the tread rubber layer is established in the casing ply outside and forms the crown; the tire further comprises an airtight layer and seam allowance protective glue, wherein the airtight layer covers the inner surface of the cord fabric layer; the bead mouth protective rubber is arranged at the bead part of the cord fabric layer.

As a further improvement of the utility model, be the side wall portion between child hat and the child lip, the gross thickness of the ply of child side portion and airtight layer is 0.75 ~ 1.1mm, and the ratio of accounting for of ply thickness d1 in the gross thickness is 0.38 ~ 0.52.

As a further improvement of the utility model, the bead heel at the bottom of the bead is a straight surface, and the inclination angle between the bead heel and the horizontal direction is 5-20 degrees.

As a further improvement of the utility model, the end part of the air-tight layer turns back to the outside of the bead lip around the bead core and is covered by the quilt opening protective rubber.

As a further improvement of the utility model, the bead protection rubber extends upwards from the end of the bead heel to form a convex arc lip and an inward concave arc lip neck.

As a further improvement of the utility model, the airtight layer and/or the seam allowance protecting rubber are made of rubber or made by embedding rubber on fibers.

As a further improvement of the present invention, the cord fabric layer is composed of at least 2 cord yarn layers.

As a further improvement of the utility model, the cord fabric layer is formed by the turning back and surrounding of one cord yarn layer, or is formed by the turning back and surrounding and overlapping of two cord yarn layers.

As a further improvement, the tire shoulder is formed at both ends of the tire tread, and the thickness of the tire shoulder is greater than that of the tire tread.

As a further improvement, the utility model discloses be provided with the buffer layer between tread glue film and the ply.

As a further improvement of the utility model, the bead core adopts a steel wire ring or a fiber ring.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) the utility model discloses a bicycle vacuum child sets up the air-tight layer in the casing ply inboard, and the child lip position sets up the bead and protects gluey to guaranteed the gas tightness of tire, for current bicycle vacuum child, this structure has the air retention of longer cycle.

(2) The utility model discloses a bicycle vacuum child because the tread glue film only sets up in child hat position, and the side wall portion between child hat and the child lip is regional does not have tread rubber, has alleviateed whole quality, reaches the lightweight purpose. Further, by controlling the thickness of the sidewall portion and controlling the thickness ratio between the carcass layer and the inner liner, a certain balance is achieved between strength and airtightness, and at the same time, the weight reduction of the tire is facilitated.

(3) The utility model discloses a bicycle vacuum child, the child heel of child lip bottom is the straight face, and its inclination with the horizontal direction is 5 ~ 20 to set up the bead core in corresponding the position, can reach better gas tightness after tire and rim cooperation, structural design is reasonable, and the principle is simple, convenient to popularize and use.

Drawings

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

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic view of the structural distribution of the bead;

FIG. 4 is a schematic representation of an embodiment of the innerliner and ply;

FIG. 5 is a schematic view of another embodiment of a ply.

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; 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; 60. a seam allowance protective adhesive; 70. a security thread.

Detailed Description

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

The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose. 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 terms is not to be construed as a scope of the present invention.

With reference to fig. 1 and 2, the vacuum tire for bicycle of the present embodiment comprises a tread rubber layer 20, a ply 40, a bead core 50, an inner liner 30 and a bead filler 60, wherein the ply 40 is supported by the bead core 50 as a base component of the tire. A tread band 20 is provided outside the ply 40 to form the crown 10 for contact with the ground. The inner liner 30 provided in this embodiment is covered on the inner surface of the carcass ply 40, and the bead filler 60 is provided on the bead lip 13 of the carcass ply 40.

As a specific embodiment, the ply 40 is formed by a single layer of cord 41 folded around the bead cores 50 at both ends, the ends of the single layer of cord 41 forming part of the overlapping area, thereby enclosing a complete loop, as shown in fig. 4. 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.

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, 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.

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.

It should be noted that most of the current technologies are to provide an anti-friction layer on the bead, which mainly uses some woven fabrics to prevent the rim from directly rubbing against the ply so as to prolong the service time of the tire. At present, most of the inner tube and the outer tube are in a common form, so that large friction exists between the inner tube and the outer tube, and rolling resistance is large during riding, so that the friction between a rim and a tire is large, and the tire can be protected by an anti-friction layer. After the tire is converted into a vacuum tire, rolling resistance is reduced, more is the requirement on air tightness, and the tire cannot keep air and has higher quality due to the arrangement of the anti-friction layer, so that the problem is solved.

The embodiment uses the bead protection rubber 60 made of rubber to replace an anti-friction layer made of textile materials, meets the requirement of the tire on air retention, and cannot generate great influence on the quality of the tire.

In order to reduce the weight, the total thickness of the cord fabric layer 40 and the airtight layer 30 is controlled to be 0.65-1.4 mm. Preferably, the thickness d1 of the ply 40 is controlled to be 0.35 to 0.50mm, and the thickness d2 of the inner liner 30 is controlled to be 0.4 to 1.0 mm. When different materials are selected, the thicknesses of the material layers may be different, and in order to meet the requirement of light weight, the thickness of each material layer and the thickness of the inner liner are controlled, for example, the thickness d1 of the ply layer 40 is 0.4mm, the thickness d2 of the inner liner 30 is 0.58mm, and the total thickness is controlled, so that the tire weight is reduced. The total thickness is primarily the thickness of the portion of the sidewall 12 between the shoulder and the bead, with the plies and innerliner portions also corresponding to the sidewall area. As other embodiments, the thickness d1 of the ply layer 40 is 0.45mm, and the thickness d2 of the inner liner 30 is 0.52 mm; or the ply 40 has a thickness d1 of 0.48mm and the inner liner 30 has a thickness d2 of 0.50 mm.

Further, the bead heel 14 at the bottom of the bead 13 is arranged to be a straight surface, and the inclination angle of the straight surface to the horizontal direction is 5-20 degrees. The heel 14 of the bead 13 is covered with a rubber layer for contact with the rim to ensure airtightness. The term "flat" as used herein means that the heel 14, in the uninstalled condition, is generally straight and, in particular, may have some slight angular irregularities, still within the range of a straight surface, up to the details.

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. The bead shield glue 60 may extend to the location of the security thread 70.

Further, the bead protection rubber 60 at the bead portion forms a convex arc-shaped lip and a concave arc-shaped lip neck for cooperation with the rim. After the installation, can form the multiple spot seal in 14 areas of child heels, lip m areas, lip neck n area, better assurance gas tightness.

With reference to fig. 3, as a further definition of the bead region, the area corresponding to the section passing through the bead core 50 and parallel to the bead heel 14 is the lip seal area in which the thickness of the outer sidewall of the bead to the ply is greater than the thickness of the other areas of the bead. Further, the region 2/3 in the middle of the lip seal corresponds to the greatest bead thickness. The thickness of the outer sidewall of the bead to the ply includes not only the thickness of the bead protection gum but also the thickness of the innerliner in this area.

The bead core 50 has a certain supporting strength, and forms a sealing point of the side portion with its corresponding position. In addition, after the tire bead is installed, the bead heel is under the action of pressure, the bead heel is matched with the rim surface, the inclination is almost extruded and disappears, and at the moment, the lip sealing area corresponding to the bead core 50 is also subjected to higher material extrusion force, so that the lip of the tire bead can be ensured to achieve higher bonding performance with the rim, and the high air tightness is effectively improved.

Further, for the bead shield rubber 60 therein, it is made of synthetic rubber, such as butyl rubber.

As another embodiment, the rubber may be embedded in the fiber or the textile. The embedding means that gaps between the fibers or the textiles are filled with rubber.

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.

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.

For the bead core 50, a bead ring or a fiber ring may be employed. When a loop is used, it may be formed from one or more strands of steel wire, for example 3 strands of steel wire as shown in the drawings.

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 twisted fiber yarns.

With respect to the bead core 50 described above, in various embodiments, it may be entirely circular, triangular, or the like, without particular limitation.

In connection with fig. 5, 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.

As another embodiment, a breaker may be provided between the tread band 20 and the ply layer 40, which can provide puncture resistance. When the tire is combined with the structure, the tire crown can be provided with the groove body in the middle area, so that the tire resistance is reduced, and the buffer layer can protect the cord fabric layer and the airtight layer.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, 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 of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A bicycle vacuum tire comprises a tread rubber layer (20), a ply layer (40) and a bead core (50), wherein the ply layer (40) is supported by the bead core (50), and the tread rubber layer (20) is arranged outside the ply layer (40) to form a tire crown (10); the method is characterized in that: the tire further comprises an airtight layer (30) and a seam allowance protection glue (60), wherein the airtight layer (30) covers the inner surface of the carcass layer (40); the bead mouth protective rubber (60) is arranged at the position of a tire lip (13) of the cord fabric layer (40).

2. A bicycle vacuum tire as in claim 1, wherein: the tire is characterized in that a tire side portion (12) is arranged between the tire crown (10) and the tire bead (13), the total thickness of a cord fabric layer (40) of the tire side portion (12) and the airtight layer (30) is 0.75-1.1 mm, and the proportion of the thickness d1 of the cord fabric layer (40) in the total thickness is 0.38-0.52.

3. A bicycle vacuum tire as in claim 1, wherein: the tire bead (13) is composed of a convex section C1 and a concave arc section C2, the bottom of the tire bead (13) is a tire heel (14) with a linear structure, and the tire heel (14), the convex section C1 and the concave arc section C2 are sequentially connected to form a matching part with a wheel rim.

4. A bicycle vacuum tire as in claim 3, wherein: the heel (14) of the bead (13) forms an inclined included angle of 3-20 degrees with the X direction.

5. A bicycle vacuum tire as in claim 3, wherein: the convex section C1 is an outward convex arc-shaped structure, 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 bead heel (14) is an RD point, the distance d2 from the inner wall of the bead core (50) to the axis of the hollow tire is not less than the dimension d1 from the RD point to the axis of the vacuum tire, and the difference is 0-1.2 mm.

6. A bicycle vacuum tire as in claim 3, wherein: the end part of the inner liner (30) is folded back to the outer side of the bead lip (13) around the bead core (50) and covered by the bead opening protection rubber (60).

7. A bicycle vacuum tire as in any one of claims 1 to 6, wherein: the airtight layer (30) and/or the seam allowance protection rubber (60) are made of rubber or made of rubber embedded in fibers.

8. A bicycle vacuum tire as in any one of claims 1 to 6, wherein: the ply (40) is comprised of at least 2 layers of cord yarn.

9. A bicycle vacuum tire as in claim 8, wherein: the cord fabric layer (40) is formed by folding back and surrounding one cord fabric layer or two cord fabric layers which are folded back, surrounding and overlapped.

10. A bicycle vacuum tire as in any one of claims 1 to 6, wherein: both ends of the crown (10) form a tire shoulder (11), and the thickness of the tire shoulder (11) is greater than that of the crown (10); or: and a buffer layer is arranged between the tread rubber layer (20) and the cord fabric layer (40).