CN114872496B

CN114872496B - Tire rim structure suitable for EV (electric vehicle) pure electric passenger car

Info

Publication number: CN114872496B
Application number: CN202210668715.9A
Authority: CN
Inventors: 刘杰; 王君; 徐伟; 董康; 马丽华; 王伟; 张峰; 刘继发
Original assignee: Qingdao Doublestar Tire Industry Co Ltd
Current assignee: Qingdao Doublestar Tire Industry Co Ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2024-01-05
Anticipated expiration: 2042-06-14
Also published as: CN114872496A

Abstract

The invention discloses a tire rim structure suitable for an EV pure electric passenger car, which comprises a bead ring, triangular rubber arranged at the upper end of the bead ring and a tire body, wherein the tire body comprises a layer of tire body, rim wear-resistant rubber and sidewall rubber; forming a layer of carcass turnup end at the junction of the inner end point of the tail end of the layer of carcass and the triangular glue; taking the lower end point of the bead abrasion-resistant rubber at the lower end of the joint of the bead abrasion-resistant rubber and the sidewall rubber as an origin, and making a vertical line closest to the triangular rubber to obtain the normal point of the lower end point of the bead abrasion-resistant rubber; a transition section with the same width is arranged on the triangular glue, the starting point of the transition section is positioned at the turn-up end point of a layer of tyre body, and the end point is positioned below the normal point of the lower end point of the seam allowance abrasion-resistant glue. Compared with the prior art, the invention has the beneficial effects that: based on the characteristics of the EV pure electric vehicle, the tire structure performance of the EV pure electric vehicle has stronger ground grabbing performance, faster power response and better control performance.

Description

Tire rim structure suitable for EV (electric vehicle) pure electric passenger car

Technical Field

The invention belongs to the field of tires, and particularly relates to a tire bead structure suitable for an EV pure electric passenger car.

Background

194 contracting parties in 2015 reach Paris's agreement, each country determines a double carbon target, and vehicle enterprises in each country stop the development of internal combustion engines and vehicles successively, and the development of clean energy vehicles such as EV pure electric vehicles, hybrid electric vehicles and hydrogen energy sources is turned to. The new energy automobile market is continuously growing, the sales of new energy vehicles worldwide reaches 675 ten thousand in 2021, the same ratio is increased by 108%, and the estimated 2022 is expected to reach 1000 ten thousand. The sales of new energy automobiles in China reaches 339.6 thousands, the same ratio is increased by 155.2%, and 550 thousands of new energy automobiles are expected to break through in 2022.

Because of the characteristics of the EV pure electric vehicle, the EV pure electric vehicle has higher requirements on tire performance. The EV pure electric vehicle can output nearly maximum output torque when starting, and the power response of the vehicle is more direct, so that the vehicle has higher requirements on the ground grabbing of tires; secondly, because the EV pure electric vehicle uses a large amount of battery packs to replace an internal combustion engine and is concentrated at a chassis part, the vehicle is more important than a common internal combustion engine vehicle by about 30 percent. There is a need for a tire with better load bearing and wear characteristics.

Therefore, it is necessary to provide a tire rim structure suitable for an EV pure electric passenger car according to the characteristics of the EV pure electric car and to satisfy the current development trend of automation, intellectualization and networking of the EV pure electric car.

Disclosure of Invention

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the present application.

The invention provides a tire rim structure suitable for an EV pure electric vehicle, which is used for meeting the higher requirements on the tire performance of the EV pure electric vehicle based on the characteristics of the EV pure electric vehicle, so that the EV pure electric vehicle has stronger ground grabbing performance, faster power response and more excellent control performance.

The invention discloses a tire bead structure suitable for an EV pure electric passenger car, which comprises a bead ring, triangular glue arranged at the upper end of the bead ring, and a tire body wrapped outside the bead ring and the triangular glue, wherein the tire body comprises

The tire body is attached to the inner side of the triangular glue, and the tail end of the tire body bypasses the bottom of the bead ring and is attached to the outer side of the triangular glue;

the junction of the inner end point of the tail end of the carcass and the triangular glue is a carcass turn-up end point;

the bead abrasion-resistant rubber is wrapped outside one layer of tire body and connected with the tire side rubber attached to the outer side of the triangular rubber;

the upper and lower endpoints of the joint of the bead abrasion-resistant rubber and the sidewall rubber are respectively a bead abrasion-resistant rubber endpoint and a bead abrasion-resistant rubber lower endpoint;

the triangular glue is provided with a sub-mouth abrasion-resistant glue lower end point normal point, and the sub-mouth abrasion-resistant glue lower end point normal point is obtained by taking the sub-mouth abrasion-resistant glue lower end point as an origin and making a vertical line closest to the triangular glue;

the radial height of the anti-wrapping end point of the carcass is higher than the radial height of the upper end of the steel wire ring, and the radial height of the anti-wrapping end point of the carcass is lower than the radial height of the normal point of the lower end point of the bead abrasion-resistant adhesive;

a transition section with the same width is arranged on the triangular glue, the starting point of the transition section is positioned at the turn-up end point of a layer of tyre body, and the end point is positioned below the normal point of the lower end point of the seam allowance abrasion-resistant glue.

In some embodiments, the straight line distance between the normal point of the lower end point of the bead abrasion-resistant glue and the turn-up end point of the carcass layer is h1;

drawing a circle by taking a layer of carcass turnup end as a circle center radius r, and intersecting with the triangular glue at the upper end of the layer of carcass turnup end, wherein the intersection point of the two is r1, and r1 is the end point of the transition section;

wherein r is more than or equal to 3mm and less than or equal to 80 percent of h1.

In some embodiments, the apex of the apex is the apex end point of the apex and the upper center point of the bead ring is the bead ring upper center point; the linear distance from the end point of the triangular glue to the midpoint of the upper end of the bead ring is D, and the relation between the linear distance and the tire section height H is 40% H or more and 55% H or less.

In some embodiments, the linear distance between the bead bond upper end point 33 and the bead bond lower end point 31 is between 10-25 mm.

In some embodiments, the radial height difference between the radial height of the turn-up end of a carcass ply and the radial height of the upper end of the bead is 5-20mm.

In some embodiments, a two layer carcass is also provided; the two layers of the carcasses are wrapped outside the one layer of carcasses, the lower ends of the two layers of carcasses bypass the bottom of the one layer of carcasses and are attached to the triangular glue after upwards extending, and the joints of the tail ends of the two layers of carcasses and the one layer of carcasses form two layers of carcass anti-wrapping endpoints.

In some embodiments, the linear distance between the two-ply carcass turnup end and the apex end is no less than 10mm.

In some embodiments, a rim guard is provided on the carcass; the radial height difference between the radial height of the outer end point of the rim protection upper rim protection and the radial height of the lower end point of the bead abrasion-resistant adhesive is-5 to +5mm.

In some embodiments, the rim protector outer end point and the bead filler lower end point coincide.

In some embodiments, the midpoint of the upper end of the bead ring is provided with a midpoint of the upper end of the bead ring, a circle is drawn by taking the midpoint of the upper end of the bead ring as a circle center radius R, the thickness G of the apex is changed as a function of the increase of the radius R,

the function relation of the thickness G of the triangular glue and the radius R is as follows:

G＝0.0001(R) ³ -0.0096(R) ² +0.102(R)+6.933；

wherein, A is less than or equal to R is less than or equal to B or C is less than or equal to R is less than or equal to D, and the units of R and G are millimeter;

a is the linear distance between the midpoint of the upper end of the wire ring and R1, and the value range is 3-4, and the unit is millimeter;

r1 is a point from the midpoint of the upper end of the bead ring to the far end of the triangular glue in the horizontal direction;

b is the linear distance from the midpoint of the upper end of the bead ring to the turn-up end of a layer of carcass, and the value range is 15-20, and the unit is millimeter;

c is the linear distance between the midpoint of the upper end of the wire ring and r1, and the value range of C is B+3 less than or equal to C less than or equal to

B+80% h1, wherein h1 is more than or equal to 5 and less than or equal to 10, and the unit is millimeter;

d is the linear distance from the middle point of the upper end of the wire ring to the end point of the triangular glue, and the value range of D is 40 percent or less and 55 percent or less, and the unit is millimeter.

Compared with the prior art, the invention has the following beneficial effects:

1. through the design of the height of the triangular glue, the bearing performance of the tire is improved, the radial rigidity is improved by 13%, the condition that the electric vehicle body is heavier is met, and the tire has higher bearing performance.

2. Through the design to the thickness of each point of apex, the horizontal rigidity of tire promotes 45%, and vertical rigidity has promoted 30%, has stronger ground performance and the performance of controlling of grabbing, satisfies the output of high torque when the EV pure electric vehicles starts, and power response is faster.

3. Through the positioning of the tire body turnup end points and the positions of the end points, the thicknesses of the seam allowance parts are smoothly transited, so that the stress concentration of the seam allowance parts is effectively avoided, the rigidity of the tire side is improved, and the driving comfort is also improved.

4. Through reasonable distribution and size design of the end positions of the triangular glue, the tyre body and the seam allowance abrasion-resistant glue, the safety performance of the tyre is higher, the durability of the tyre is improved by 67%, the high-speed performance is improved by 22%, and the running safety of the product in various road conditions, particularly in severe road conditions, is met.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

In the drawings:

fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 3 of the present invention.

Fig. 3 is a schematic diagram showing the positional relationship among the midpoint of the upper end of the bead ring, the turn-up end of the carcass ply, the end point of the apex, R1 and R1 in example 3 of the present invention.

Fig. 4 is a schematic diagram of the positional relationship between the rim protecting outer end point and the bead abrasion-resistant adhesive lower end point of the present invention.

FIG. 5 is a graph of the thickness G of the apex as a function of radius R in accordance with the present invention.

Fig. 6 is a graph showing thickness data at each key point of the apex of inventive example 1, example 2 and comparative example 1.

Fig. 7 is a graph of simulated analysis temperature data of each key point FEA of the apex of the present invention in example 1, example 2 and comparative example 1.

FIG. 8 is a graph showing the indoor performance test condition data of example 1, example 2 and comparative example 1 of the present invention.

Fig. 9 is a graph showing outdoor performance test condition data of example 1, example 2 and comparative example 1 of the present invention.

Description of the drawings: the tire bead rim comprises a bead filler 1, a bead ring 2, a bead filler 3, a sidewall filler 4, a first layer of tire body 5, a second layer of tire body 6, a transition section 7, a rim protection outer end point 8, a bead ring upper end midpoint 21, a bead filler lower end point 31, a bead filler lower end point normal point 32, a bead filler upper end point 33, a first layer of tire body turn-up end point 51, a second layer of tire body turn-up end point 61 and a bead filler upper end point 11.

Detailed Description

The present invention will be described and illustrated with reference to the accompanying drawings and examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided by the present invention without making any inventive effort, are intended to fall within the scope of the present invention.

It is apparent that the drawings in the following description are only some examples or embodiments of the present invention, and it is possible for those of ordinary skill in the art to apply the present invention to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the described embodiments of the invention can be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "a," "an," "the," and similar referents in the context of the invention are not to be construed as limiting the quantity, but rather as singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in connection with the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.

Example 1:

a tyre bead structure suitable for EV pure electric passenger car comprises a bead ring 2, a triangular rubber 1 arranged at the upper end of the bead ring 2, and a tyre body wrapped outside the bead ring 2 and the triangular rubber 1,

the carcass comprises

A layer of matrix 5 which is attached to the inner side of the triangular glue 1, and the tail end of which bypasses the bottom of the bead ring 2 and is attached to the outer side of the triangular glue 1;

the intersection of the inner end point of the tail end of the carcass 5 and the apex 1 is a carcass turn-up end point 51;

the bead abrasion-resistant rubber 3 is wrapped outside a layer of tire body 5 and is connected with the sidewall rubber 4 attached to the outer side of the triangular rubber 1;

the upper and lower end points of the bead abrasion-resistant rubber 3 and the sidewall rubber 4 are respectively a bead abrasion-resistant rubber end point 33 and a bead abrasion-resistant rubber lower end point 31;

taking the lower end point 31 of the sub-mouth abrasion-resistant glue as an origin to make a vertical line closest to the triangular glue 1 so as to obtain a normal point 32 of the lower end point of the sub-mouth abrasion-resistant glue;

the radial height of the one-layer carcass turnup end point 51 is higher than the radial height of the upper end of the bead ring 2, and the radial height of the one-layer carcass turnup end point 51 is lower than the radial height of the normal point 32 of the bead abrasion-resistant rubber lower end point; the design mode realizes uniform transition of the material at the seam allowance part, can effectively avoid the problem of stress concentration, reduces the occurrence probability of early damage of the tire, and improves the safety.

The triangular glue 1 is provided with a section of transition section 7 with equal width, the starting point of the transition section 7 is positioned at the turn-up end point 51 of a layer of tyre body, and the end point is positioned below the normal point 32 of the lower end point of the bead abrasion-resistant glue. Because the position is positioned at the stress concentration point of the seam allowance, the triangular glue adopts a transition section with equal thickness, and the rigidity change caused by the lack of the carcass material is relieved by increasing the thickness of the triangular glue. The rigidity of the seam allowance part is improved, and the control stability and braking safety of the tire are enhanced.

Further, the linear distance between the normal point 32 of the lower end point of the bead abrasion-resistant adhesive and the turn-up end point 51 of the carcass ply is h1;

drawing a circle by taking a layer of carcass turnup end 51 as a circle center radius r, and intersecting with the triangular glue 1 at the upper end of the layer of carcass turnup end 51, wherein the intersection point of the two is r1, and r1 is the end point of the transition section 7;

Further, the vertex of the triangular glue 1 is a triangular glue endpoint 11, and the upper center point of the bead ring 2 is a bead ring upper center point 21; the linear distance from the end point 11 of the triangular glue to the midpoint 21 of the upper end of the bead ring is D, and the relation between the linear distance and the section height H of the tire is 40 percent H.ltoreq.D.ltoreq.55 percent H.

Further, the linear distance between the bead bond adhesive end point 33 and the bead bond adhesive lower end point 31 is between 10-25 mm.

Further, the radial height difference between the radial height of the carcass turnup end 51 and the radial height of the upper end of the bead ring 2 is 5-20mm.

Further, as shown in fig. 4, a rim protection is arranged on the carcass; the radial height difference between the radial height of the rim guard upper rim guard outer end point 8 and the radial height of the bead abrasion resistant rubber lower end point 31 is-5 to +5mm.

Further, the rim protection outer end point 8 and the bead abrasion-resistant glue lower end point 31 are overlapped. The even transition of materials at the sub-opening is realized, and when the lower end point of the sub-opening wear-resistant adhesive is higher than the outer end point of the rim protection, the problem of sub-opening cracking possibly occurs due to the torsion and frequent braking of the tire; when the lower end point of the sub-opening abrasion-resistant adhesive is lower than the outer end point of the rim protection, the rigidity transition of the sub-opening part is uneven, and the rigidity of the sub-opening part is too high to influence the riding comfort.

Further, the midpoint of the upper end of the bead ring 2 is provided with a bead ring upper midpoint 21, a circle is drawn by taking the bead ring upper midpoint 21 as the circle center radius R, the thickness G of the triangular glue 1 changes as a function of the increase of the radius R,

G＝0.0001(R) ³ -0.0096(R) ² +0.102(R)+6.933；

a is the linear distance between the midpoint 21 at the upper end of the wire ring and R1, and the value range is 3-4, and the unit is millimeter;

r1 is a point from the midpoint 21 at the upper end of the bead filler to the far end of the apex 1 in the horizontal direction;

b is the linear distance between the middle point 21 at the upper end of the wire ring and the turn-up end 51 of a layer of carcass, and the value range is 15-20, and the unit is millimeter;

c is the linear distance between the midpoint 21 at the upper end of the wire ring and r1, and the value range is B+3-C-B+80% h1, wherein h1 is more than or equal to 5 and less than or equal to 10, and the unit is millimeter;

d is the linear distance from the midpoint 21 of the upper end of the wire ring to the endpoint 11 of the triangular glue 1, and the value range of D is 40% H or less and 55% H or less, and the unit is millimeter.

Example 2:

the specific difference between the embodiment 2 and the embodiment 1 is that a transition section 7 with equal width is not provided on the apex 1, and meanwhile, the function of the apex thickness G and the radius R is as follows:

G＝0.0001(R) ³ -0.0096(R) ² +0.102 (R) +6.933; wherein A is more than or equal to R is more than or equal to D. I.e. the thickness G of the apex decreases with increasing radius R.

Example 3:

the specific difference between example 3 and example 1 is that: example 3 is a multi-layer carcass structure, as shown with particular reference to figures 2 and 3,

wherein, two layers of carcasses 6 are also arranged; the two-layer tyre body 6 wraps the outer part of the one-layer tyre body 5, the lower end of the two-layer tyre body bypasses the bottom of the one-layer tyre body 5, and is attached to the apex 1 after upwards extending, and the joint of the tail end of the two-layer tyre body and the one-layer tyre body 5 forms a two-layer tyre body anti-wrapping end point 61.

Further, the linear distance between the two-layer carcass turnup end 61 and the apex upper end 11 is not less than 10mm.

In the above embodiments 1-3, the functional relationship between the thickness G and the radius R of the apex is specifically that the structural design of each point of different sub-openings is simulated and analyzed by finite elements, and a scheme in which the stress strain energy density of the sub-opening is the lowest and the branches of each end point are uniform is selected, and the dimensional design of the apex is reversely deduced, so as to obtain a regression equation thereof, which is specifically shown in fig. 5.

The tire bead structure suitable for the EV purely electric passenger car provided by the invention is described below through specific case comparison.

Comparative example 1:

is a conventional thickness structural design mode of the triangular glue. The specific setting mode refers to the thickness value of each triangular glue shown in fig. 6.

Wherein, figure 6 shows the numerical comparison of the thickness of each key point of the apex of example 1, example 2 and comparative example 1, wherein 1/2 (r 1-51) is the midpoint of the distance between the r1 point and the two points of the one-layer carcass turnup end 51.

It should be noted that when stress concentration occurs in the tire, the strain energy density of the portion or the region is too high, which means that the portion or the region is not reasonably designed, and damage or performance degradation is easily caused. Meanwhile, it can be interpreted that the strain energy density represents a difference in the degree of heat generation, and the higher the strain energy density is, the higher the heat generation is, and the higher the temperature is.

Fig. 7 shows the simulation analysis of the temperature conditions of each key point FEA of the apex of example 1, example 2 and comparative example 1, and the data can find that the scheme adopted in example 1, compared with comparative example 1, has the temperature respectively reduced by 10 ℃,20 ℃, 5 ℃ at three positions of the carcass turn-up end 51, r1 and the bead abrasion-resistant adhesive lower end normal point 32, which indicates that the stress strain energy density of the region is lower and the structural distribution of each point of the apex is more reasonable.

Fig. 8 shows the indoor performance test cases of example 1, example 2 and comparative example 1, and the data show that by adopting the technical scheme of example 1 of the present application, compared with comparative example 1, the high-speed performance of the product is improved by 22%, the durability is improved by 67%, the transverse rigidity is improved by 45%, the longitudinal rigidity is improved by 30% and the radial rigidity is improved by 13%.

Fig. 9 shows outdoor performance test cases of example 1, example 2 and comparative example 1, and it can be found by data that, by adopting the technical scheme of example 1 of the present application, compared with comparative example 1, comfort is improved by 8%; the dry handling performance is improved by 10%; the wet land control performance is improved by 7%; the dry braking performance is improved by 7%; the braking performance of the wetland is improved by 8 percent.

In summary, the above data comparison can prove that the design scheme of the embodiment 2 is better than the design scheme of the comparative example 1, and the embodiment 1 further improves various performance parameter indexes by adding a transition section 7 with equal width on the basis of the embodiment 2. And is therefore the optimal solution.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The utility model provides a tire rim structure suitable for EV pure electric passenger car, includes bead ring (2), locates bead ring (2) upper end triangular glue (1) and wraps up outside bead ring (2) and triangular glue (1), its characterized in that: the carcass comprises

A layer of matrix (5) is attached to the inner side of the triangular glue (1), and the tail end of the matrix bypasses the bottom of the bead ring (2) and is attached to the outer side of the triangular glue (1);

the junction of the inner end point of the tail end of the carcass (5) and the triangular glue (1) is a carcass turn-up end point (51);

the bead abrasion-resistant rubber (3) is wrapped outside a layer of tire body (5) and is connected with the sidewall rubber (4) attached to the outer side of the triangular rubber (1);

the upper and lower endpoints of the seam allowance abrasion-resistant glue (3) and the sidewall glue (4) are respectively an seam allowance abrasion-resistant glue upper endpoint (33) and a seam allowance abrasion-resistant glue lower endpoint (31);

the triangular glue (1) is provided with a sub-mouth abrasion-resistant glue lower end point normal point (32), and the sub-mouth abrasion-resistant glue lower end point normal point (32) is obtained by taking a sub-mouth abrasion-resistant glue lower end point (31) as an origin and making a vertical line closest to the triangular glue (1);

the radial height of the one-layer carcass turnup end (51) is higher than the radial height of the upper end of the bead ring (2), and the radial height of the one-layer carcass turnup end (51) is lower than the radial height of the normal point (32) of the lower end point of the seam allowance abrasion-resistant adhesive;

a transition section (7) with equal width is arranged on the triangular glue (1), the starting point of the transition section (7) is positioned at a layer of carcass turn-up end point (51), and the end point is positioned below a normal point (32) of the lower end point of the bead abrasion-resistant glue;

the tire body is provided with a rim for protection; the rim protection outer end point (8) is overlapped with the bead abrasion-resistant glue lower end point (31).

2. The tire bead structure adapted for use in an EV-only electric passenger vehicle as claimed in claim 1, wherein:

the linear distance between the normal point (32) of the lower end point of the sub-mouth abrasion-resistant adhesive and the turn-up end point (51) of the carcass is h1, and the unit is millimeter;

drawing a circle by taking a layer of carcass turnup end (51) as a circle center radius r, and intersecting with a triangular glue (1) at the upper end of the layer of carcass turnup end (51), wherein the intersection point of the two is r1, and r1 is the end point of a transition section (7);

3. The tire bead structure adapted for use in an EV-only electric passenger vehicle as claimed in claim 2, wherein:

the vertex of the triangular glue (1) is a triangular glue endpoint (11), and the upper end center point of the bead ring (2) is a bead ring upper center point (21); the linear distance from the end point (11) on the triangular glue to the midpoint (21) at the upper end of the bead ring is D, and the relation between the linear distance and the section height H of the tire is 40% H.ltoreq.D.ltoreq.55% H.

4. The tire bead structure adapted for use in an EV-only electric passenger vehicle as claimed in claim 1, wherein: the straight line distance between the end point (33) of the sub-mouth abrasion-resistant adhesive and the lower end point (31) of the sub-mouth abrasion-resistant adhesive is between 10 and 25 mm.

5. The tire bead structure adapted for use in an EV-only electric passenger vehicle as claimed in claim 1, wherein: the radial height difference between the radial height of the turn-up end (51) of the carcass and the radial height of the upper end of the bead ring (2) is 5-20mm.

6. The tire bead structure for EV-only electric passenger vehicles according to claim 3, wherein: two layers of carcasses (6) are also arranged; the two layers of the tyre bodies (6) are wrapped outside the one layer of the tyre bodies (5), the lower ends of the two layers of the tyre bodies bypass the bottom of the one layer of the tyre bodies (5), and are attached to the triangular glue (1) after upwards extending, and the tail ends of the two layers of the tyre bodies are connected with the one layer of the tyre bodies (5) to form two layers of tyre body anti-wrapping endpoints (61).

7. The tire bead structure adapted for use in an EV-only electric passenger vehicle as claimed in claim 6, wherein: the linear distance between the two-layer carcass turnup end (61) and the apex upper end (11) is not less than 10mm.

8. The tire bead structure for EV-only electric passenger vehicles according to claim 3, wherein: and drawing a circle by taking the middle point (21) at the upper end of the bead ring as a circle center radius R, wherein the thickness G of the triangular glue (1) changes as a function along with the increase of the radius R, and the functional relation between the thickness G of the triangular glue and the radius R is as follows:

G=0.0001(R) ³ -0.0096(R) ² +0.102(R)+6.933；

a is the linear distance between the midpoint (21) of the upper end of the wire ring and R1, and the value range is 3-4, and the unit is millimeter;

r1 is a point from the midpoint (21) of the upper end of the bead ring to the far end of the triangular glue (1) in the horizontal direction;

b is the linear distance between the middle point (21) of the upper end of the wire ring and the turn-up end (51) of a layer of carcass, and the value range is 15-20, and the unit is millimeter;

c is the linear distance between the midpoint (21) of the upper end of the wire ring and r1, and the value range is B+3-C-B+80% h1, wherein h1 is more than or equal to 5-10, and the unit is millimeter;

d is the straight line distance from the midpoint (21) of the upper end of the wire ring to the endpoint (11) of the triangular glue (1), and the value range of D is 40% H-55% H, and the unit is millimeter.