CN111993846B - Small-size all-steel tire with high bearing performance - Google Patents

Small-size all-steel tire with high bearing performance Download PDF

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Publication number
CN111993846B
CN111993846B CN202010858135.7A CN202010858135A CN111993846B CN 111993846 B CN111993846 B CN 111993846B CN 202010858135 A CN202010858135 A CN 202010858135A CN 111993846 B CN111993846 B CN 111993846B
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tire
end point
height
along
steel wire
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CN111993846A (en
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李竹林
施俊
张金船
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Anhui Giti Radial Tire Co Ltd
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Anhui Giti Radial Tire Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/02—Carcasses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

The invention discloses a small-sized all-steel tire with high bearing performance, which relates to the field of all-steel tires and comprises a tire body, wherein the tire body comprises a tire body, a tread part and a bead part, the ratio of the height of an end point A extending outwards along the radial direction of the tire body to the height of the axial section of the tire is 0.19-0.28, the structure of the small-sized all-steel tire is simple, compared with the mode of increasing the structure of tire body filling rubber to smooth transition stress in the prior art, the invention smoothes the transition stress by the structure of smoothly transiting and fixing the lower end of shoulder pad rubber and the upper end of upper triangular rubber, compared with the prior art, the invention reduces the parts of the tire body filling rubber, reduces the production complexity and the production cost, the tire body turnup end point of the prior art is positioned at the lower part or the middle part of a tire side area and has no steel wire wrapping cloth, the deflection deformation of the tire side area is large, and the fault is easy to occur at the tire body turnup end point, the tyre body turn-up end point is arranged at the tyre bead part, the deformation is small, and the steel wire wrapping cloth is arranged to reduce the stress at the tyre body turn-up end point.

Description

Small-size all-steel tire with high bearing performance
Technical Field
The invention relates to the field of all-steel tires, in particular to a small all-steel tire with high bearing performance.
Background
At present, the major transport market mainly transports undetachable large-scale equipment, and the traveling speed is slower, and the requirement on bearing is higher. Since the height of the cargo is not adjustable, it is desirable to reduce the outer diameter of the tire as much as possible to reduce the vehicle chassis height. Aiming at the characteristics of high bearing requirement and small outer diameter of the tire required by the market, the existing semisteel car tire can meet the requirement of small outer diameter but has lower bearing capacity, and the existing all-steel tire can meet the bearing requirement but has larger outer diameter.
When the outer diameter of the tire is small, the deformation area of the tire side is small, if the apex is not overlapped on the shoulder pad rubber, the distance between the upper end point of the apex positioned in the tire side bending area and the lower end point of the shoulder pad rubber is small, the stress is concentrated at the upper end point of the apex and the lower end point of the shoulder pad rubber, the tire side is repeatedly bent in the tire side area in the using process of the tire, and the side burst is easily generated at the upper end point of the apex and the lower end point of the shoulder pad rubber. There is therefore a need in the existing tire market for tires that are capable of meeting both high load bearing and small diameter.
Disclosure of Invention
The invention aims to provide a small all-steel tire with high bearing performance, which can effectively enhance the rigidity of a tire side part and reduce the failure of the tire side part by increasing the tire body filling rubber and changing the size of the tire apex matched with the tire side part in the opposite direction so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a small-sized all steel tire with high bearing performance comprises a tire body including a carcass, a tread portion and a bead portion, the bead part comprises a steel wire ring, lower triangular rubber and upper triangular rubber, the width of the axial section of the tire body is less than 210mm, the height of the axial section of the tire body is less than 150mm, the outer diameter of the tire body is less than 700mm, the tread part comprises shoulder pad rubber which is smoothly connected and fixed with one side of the upper triangular rubber close to the tire cavity, one end of the tire body close to the bead ring winds around the bead ring and extends outwards along the radial direction of the tire along one end surface of the tire, the width of the superposed part of the upper triangular rubber and the shoulder pad rubber along the radial direction of the tire is 5mm-30mm, the ratio of the height of an end point A of the tire body extending outwards along the radial direction of the tire to the height of the axial section of the tire is 0.19-0.28.
As a further scheme of the invention: the outer end of matrix is equipped with the steel wire infantees that wraps up matrix side, the ratio of the height of steel wire infantees along the outside endpoint B of tire axial and tire axial section height is not less than 0.13, and the steel wire infantees highly is less than more than the 2mm of the endpoint A height that the matrix extended along the radial outside of tire along the outside endpoint B of tire axial, the ratio of the height of steel wire infantees along tire axial inner endpoint D and tire axial section height is not less than 0.33, steel wire infantees is located shoulder pad along the radial inboard of tire of radial inside endpoint along the shoulder pad glue along the radial outside of tire along tire radial inside endpoint along tire axial inner endpoint D, steel wire infantees is located down the apex along the radial outside of tire outside endpoint along tire radial along tire axial inner endpoint D along tire axial.
As a further scheme of the invention: the ratio of the radial outward endpoint C of the lower triangular rubber along the tire to the axial section height of the tire is not less than 0.27, and the radial outward endpoint C of the lower triangular rubber along the tire is lower than the height of the axial inner endpoint D of the steel wire wrapping cloth along the tire by more than 2 mm.
As a further scheme of the invention: the thickness of the thinnest part of the tire body sidewall along the axial direction of the tire is not less than 11.5 mm.
As a further scheme of the invention: the Shore hardness range of the lower triangular glue is 75-95 degrees, the Shore hardness ranges of the upper triangular glue and the shoulder pad glue are both 45-65 degrees, and the Shore hardness difference of the upper triangular glue and the shoulder pad glue is not more than 5 degrees.
Compared with the prior art, the invention has the beneficial effects that: compared with the mode of increasing the tire body filling rubber structure to smooth the transition stress in the prior art, the tire body filling rubber structure has the advantages that the transition stress is smoothed by the structure that the lower end of the shoulder pad rubber and the upper end of the upper triangular rubber are in smooth transition and are fixed, compared with the prior art, the tire body filling rubber structure reduces the components of the tire body filling rubber, reduces the production complexity and reduces the production cost; the tyre body turn-up end point in the prior art is positioned at the lower part or the middle part of the tyre side area and is free of the steel wire wrapping cloth, the deflection deformation of the tyre side area is large, and faults are easy to occur at the tyre body turn-up end point.
Drawings
FIG. 1 is a partial cross-sectional structural schematic view of a small all-steel tire with high load-bearing capacity;
in the figure: 1-a tyre body; 2-a belt ply; 3-shoulder pad glue; 4-a carcass; 5-wrapping the steel wire with cloth; 6-steel wire ring; 7-lower triangular glue; 8-applying triangular glue.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a small all-steel tire with high load-bearing performance includes a tire body 1, where the tire body 1 includes a tire body 4, a belt layer 2, a sidewall portion, and a bead portion, a width L1 of an axial cross section of the tire body is less than 210mm, a height L2 of the axial cross section of the tire body is less than 150mm, and an outer diameter of the tire body is less than 700 mm.
The thickness of the thinnest part of the tire side wall along the axial direction of the tire is not less than 11.5mm, the area of the side wall part is reduced due to the small outer diameter and the small section height of the tire, meanwhile, compared with the tire shoulder part and the bead part of the tire which are thick and high in rigidity, the thickness of the side wall part is small, the rigidity is low, and the stress deformation of the tire is large in the driving process, so that the side wall is easy to generate faults such as side burst. The invention increases the thickness of the thinnest part of the tire side part, can enhance the rigidity of the tire side part, enables the rigidity of the tire to smoothly transit from the tire shoulder part to the tire bead part, and reduces the possibility of failure of the tire side part.
The tyre bead part comprises a steel wire ring 6, a lower triangular rubber 7 fixed outside the steel wire ring, an upper triangular rubber 8 smoothly connected and fixed with the lower triangular rubber and a steel wire wrapping cloth 5, and the tyre tread part comprises a shoulder pad rubber which is upwards smoothly connected and fixed with one side of the upper triangular rubber close to the tyre cavity; the width of the superposed part of the upper triangular rubber and the shoulder pad rubber along the radial direction of the tire is 5mm-30mm, when the width of the superposed part of the upper triangular rubber and the shoulder pad rubber is smaller, the outer end point of the upper triangular rubber along the radial direction of the tire and the inner end point of the shoulder pad rubber along the radial direction of the tire are both stress concentration points, and the phenomenon of sidewall stress concentration is aggravated when the distance between the two end points is smaller; when the width of the overlapping portion of the upper bead apex and the shoulder pad apex is large, the upper bead apex is too close to the end points of each portion of the shoulder portion along the outer end point in the radial direction of the tire, and meanwhile, the lower end point of the shoulder pad apex is too close to each end point of the bead portion, which also aggravates the phenomenon of stress concentration.
In order to verify the arrangement mode between the apex and the shoulder pad, which has the effect derived from the above theory, the experimental data is verified through the following experiments in this embodiment:
the radial stiffness and sidewall lateral stiffness of the tire were analyzed by finite element analysis 205/55R17.5 tire, with a 6.75X 17.5 rim assembled, at 100% air pressure charged, 100% load charged, and at 130% air pressure charged, 150% load charged.
The prior art 6.50R16LT tire was analyzed by finite element analysis, assembled with a 5.50F-16 rim, and analyzed for tire radial stiffness and sidewall lateral stiffness under the same air pressure, load conditions as 205/55R 17.5.
Figure BDA0002647163610000041
Non-overlapping is defined as: there is no contact between the two.
From the experimental data results reflected in the above table, it can be derived:
compared with the mode that the apex and the shoulder pad rubber are smoothly connected and fixed, the mode that the apex and the shoulder pad rubber are not overlapped has the advantages that the radial rigidity and the lateral rigidity of the tire side are increased to a certain extent, the radial rigidity of the tire is enhanced, the bearing capacity of the tire can be improved, the lateral rigidity of the tire side is enhanced, the rigid transition of the tire from the tire shoulder part to the tire bead part is smoother, and therefore the mode that the apex and the shoulder pad rubber are smoothly connected and fixed can effectively reduce the faults of the tire side part.
205/55R17.5 has an outer diameter of 675mm, a section height of 116.3mm, a prior art 6.50R16LT has an outer diameter of 750mm and a section height of 173.5mm, and the radial stiffness and the sidewall lateral stiffness of the small tire are both increased to a certain extent under the above experimental conditions compared with the normal tire in the prior art, so that the radial stiffness and the sidewall lateral stiffness of the small tire can be increased while the chassis height of the automobile is effectively reduced.
The ratio range of the height of the steel wire wrapping cloth along the axial outer end point B of the tire to the axial section height of the tire is more than or equal to 0.13 and is more than 2mm lower than the height of an end point A of the tire body extending outwards along the radial direction of the tire. Tire and rim flange contact site's stress is higher, if the steel wire infantees highly too high along tire axial outer extreme, can be located the matrix of steel wire infantees along tire axial outer extreme, the extreme point height on lower apex and the steel wire infantees is too high, even be close to the middle part of the great child lateral part that warp, easily arouse each extreme point department trouble, steel wire infantees highly being less than the matrix along the radial more than 2mm of the extreme point A height that outwards extends of tire along tire axial endpoint B, both ends point is the stress concentration point, the distance is too near can lead to stress concentration.
One end of the tire body close to the bead ring rounds the bead ring and extends outwards along the radial direction of the tire along one end face inward along the radial direction of the tire, and the ratio of the height of an endpoint A of the tire body extending outwards along the radial direction of the tire to the height of the axial section of the tire is 0.19-0.28; the ratio range of the outer end point C of the lower triangular rubber along the radial direction of the tire to the axial section height of the tire is more than or equal to 0.27, meanwhile, the end point C of the lower triangular rubber outward along the radial direction of the tire is less than the height of the inner end point D of the steel wire wrapping cloth along the axial direction of the tire by more than 2mm, the ratio range of the height of the inner end point D of the steel wire wrapping cloth along the axial direction of the tire to the section height is more than or equal to 0.33, the D point is positioned at the inner side of the end point of the shoulder pad rubber inward along the radial direction of the tire, the outer end point B of the steel wire wrapping cloth along the axial direction of the tire, the end point A of the tire body extending outward along the radial direction of the tire, the outer end point C of the lower triangular rubber along the radial direction of the tire and the inner end point D of the steel wire wrapping cloth along the axial direction of the tire are points with large rigidity change, the end points are staggered in the radial direction of the tire, the uniform transition of the rigidity of the tire is facilitated, and the stress concentration points are staggered in the radial direction of the tire, the problem of stress concentration can be reduced; the inner endpoint D of the steel wire wrapping cloth along the axial direction of the tire is positioned on the outer side of the lower bead filler along the radial direction of the tire along the outer endpoint C of the tire, and the rigidity of the steel wire is stronger, so that the integral rigidity of the bead part can be enhanced, and the load-carrying capacity is improved.
In order to verify the accuracy of the theoretical derivation result obtained after the position of each endpoint is limited, the invention respectively verifies the ratio of the height of each endpoint to the height of the axial section of the tire:
assembling a 6.75 multiplied by 17.5 wheel rim through finite element analysis 205/55R17.5 tire with a bead filler lapping scheme, and analyzing the external end point shear strain of the tire body, the external end point shear strain of the wire wrapping cloth and the radial rigidity of the tire under the conditions of 100% air pressure inflation and 100% load loading; analyzing the shear strain of the outer end point of the tire body, the shear strain of the outer end point of the steel wire wrapping cloth and the radial rigidity of the tire under the same air pressure and load conditions of 205/55R17.5 by finite element analysis of a prior art 6.50R16LT tire, assembling a 5.50F-16 rim; the experimental performance obtained at the end of the two tire experiments was compared.
For simplicity of description, the carcass outer end point a in the following table is an end point at which the carcass extends outward in the tire radial direction; the outer end point B of the steel wire wrapping cloth is an end point of the steel wire wrapping cloth which is outward along the axial direction of the tire; the outer end point C of the lower triangular rubber is an end point of the lower triangular rubber which is outward along the radial direction of the tire; the inner end point D of the steel wire wrapping cloth is an end point of the steel wire wrapping cloth which is inward along the axial direction of the tire.
In the following experiments, the upper limit of the ratio range of the height A of the outer end point of the tire body to the height of the axial section of the tire is 0.28, the lower limit is 0.19, the middle value is 0.24, the upper limit is exceeded, and the lower limit is exceeded, wherein the upper limit is 0.3; the ratio of the height of the outer end point B of the tire wire wrapping cloth to the height of the axial section of the tire is 0.16 in the range, 0.13 in the lower limit and 0.10 in the range exceeding the lower limit; the ratio of the height of the outer end point C of the lower bead filler of the tire to the height of the axial section of the tire is 0.31 in the range, 0.27 in the lower limit and 0.24 in the lower limit; the ratio of the height of the inner end point D of the tire wire wrapping cloth to the height of the axial section of the tire is 0.36 in the range, 0.33 in the lower limit and 0.30 in the upper limit.
Note: the lower the values in the table below, the worse the results.
Figure BDA0002647163610000061
From the experimental data in the above table it can be derived:
1. when the height ratio of the outer end point of the tire body is 0.24, the height ratio of the outer end point of the steel wire wrapping cloth is 0.16, the height ratio of the outer end point of the lower bead filler is 0.31, and the height ratio of the inner end point of the steel wire wrapping cloth is 0.36, the shear strain of the outer end point of the tire body, the shear strain of the outer end point of the steel wire wrapping cloth and the radial rigidity value of the tire can simultaneously reach better levels, and the comprehensive data of the tire in the embodiment 1 are optimal.
2. From comparison of comparative example 1 and comparative example 2 and comparison of example 1, example 2 and example 3, changing only the height ratio of the outer end point a of the carcass, keeping the height ratio of the points B, C and D the same, it can be found that: when the ratio of the height of the outer end point A of the tire body to the height of the axial section of the tire is 0.19, 0.24 and 0.28, the shear strain of the outer end point A of the tire body and the shear strain of the outer end point B of the steel wire wrapping cloth are improved to a certain extent compared with the prior art and when the upper limit is exceeded by 0.28 or is smaller than the lower limit by 0.19.
3. From comparative example 3 and comparison between example 1 and example 4, it can be seen that, while keeping the height ratio of the points a, C and D the same, only the height ratio of the point B at the outer end of the flipper is changed: when the ratio of the height of the outer end point B of the steel wire wrapping cloth to the height of the axial section of the tire is 0.13 to 0.16, the shear strain of the outer end point A of the tire body and the shear strain of the outer end point B of the steel wire wrapping cloth are both improved to a certain extent compared with the lower limit of 0.13. Compared with the prior art, the tire bead wrapping cloth is added, so that the shearing strain of the outer end point A of the tire body is obviously reduced.
4. From the comparison of comparative example 4 and the comparison of examples 1 and 5, the height ratio of the points A, B and D is kept the same, and only the height ratio of the point C at the outer end of the lower apex is changed, it can be found that: when the ratio of the height of the outer end point C of the lower apex to the height of the axial section of the tire is 0.27 to 0.31, the radial rigidity of the tire is improved to a certain extent compared with the prior art and the ratio of the height of the outer end point C of the lower apex to the height of the axial section of the tire is less than the lower limit of 0.27, and the change of the outer end point C of the lower apex has less influence on the shear strain of the outer end point A of the tire body and the shear strain of the outer end point B of the steel wire wrapping cloth, so that the analysis is not carried out.
5. From comparative example 5 and comparison between example 1 and example 6, it can be seen that, while keeping the height ratio of the points a, B and C the same, only the height ratio of the point D in the flipper is changed: when the ratio of the height of the D point of the inner end point of the steel wire wrapping cloth to the height of the axial section of the tire is 0.33 and 0.36, the radial rigidity of the tire is improved to a certain extent compared with the radial rigidity of the tire which is less than the lower limit of 0.33.
Comparative example 6: when the outer end point of the tire body, the outer end point of the steel wire wrapping cloth, the outer end point of the lower triangular glue and the inner end point of the steel wire wrapping cloth exceed the lower limit, the shearing strain of the outer end point of the tire body and the shearing strain of the outer end point of the steel wire wrapping cloth are reduced, and the radial rigidity is reduced.
In the above experimental data, the range of the ratio of the height of each end point to the height of the axial section of the tire is verified, and the experimental effect is compared with the prior art, so that the range of the height ratio of each end point has specificity, and meanwhile, the range of the height ratio of each end point has specificity by verifying the value outside the range of the ratio of the height of each end point to the height of the axial section of the tire and comparing the experimental effect with the prior art, so that the range of the height ratio of each end point has specificity.
The Shore hardness range of the lower triangular glue is 75-95 degrees, the Shore hardness range of the upper triangular glue and the shoulder pad glue is 45-65 degrees, and the Shore hardness difference of the upper triangular glue and the shoulder pad glue is not more than 5 degrees; the Shore hardness of the upper triangular rubber and the shoulder pad rubber is lower than that of the lower triangular rubber, so that the rigidity transition from the bead portion to the sidewall portion and the shoulder portion is facilitated. The tire side portion is out of shape greatly, and the shore hardness of going up apex and shoulder pad is lower and is equal, can reduce the stress concentration of the last extreme point department of apex and shoulder pad.
The invention relates to a small all-steel tire with high bearing performance, which mainly comprises the following steps:
1. selecting a tyre with the specification of 205/55R17.5, the outer diameter determined as 675mm, the section width determined as 203mm and the section height determined as 116.3 mm;
2. extruding shoulder pad glue through an extruder, wherein the Shore hardness of the shoulder pad glue in a finished tire is 55 degrees;
3. preparing a bead filler composite part through an extruder, wherein the Shore hardness of the lower bead filler in a finished tire is 83 degrees, and the Shore hardness of the upper bead filler in the finished tire is 54 degrees;
4. the tire side of laminating in proper order on the building drum during the shaping, the inner liner, the steel wire infantees, the matrix, by mechanical device with compound steel wire winding together, down the apex and go up the apex and transmit to the building drum on, after the shoulder pad is glued in the laminating, mechanical device will be pasted on belted layer and the child hat transmission to the building drum together, the building drum is aerifyd and is heaved, by the pressure roller child hat of suppressing, the apex, carry out the turn-up and the pressure of side wall again, vulcanize and inspect, pack after the child embryo shaping is accomplished.
After the tire of the present invention is manufactured through the above steps, the durability of the tire is tested:
the test tires were mounted on a 6.75 × 17.5 rim, inflated at a pressure of 1050kPa, and subjected to a durability test at an ambient temperature of 38 ℃ according to the following procedure:
Figure BDA0002647163610000081
Figure BDA0002647163610000091
according to the endurance test method, the tested tire is intact after running for 47 hours, and the market use requirement is met.
The tire body filling rubber structure has a novel structure and stable operation, and when the tire body filling rubber structure is used, compared with a mode of increasing the tire body filling rubber structure to smooth the transition stress in the prior art, the tire body filling rubber structure has the advantages that the transition stress is smoothed by the structure that the lower end of the shoulder pad rubber and the upper end of the upper triangular rubber are smoothly transited and fixed, compared with the prior art, the tire body filling rubber structure reduces the components of the tire body filling rubber, reduces the production complexity and reduces the production cost; the tyre body turn-up end point of the prior art is positioned at the lower part or the middle part of the tyre side part and does not have the steel wire wrapping cloth, the deflection deformation of the tyre side part is large, and the fault is easy to occur at the tyre body turn-up end point.
Compared with the tire in the prior art, the invention has the advantages that the end points in the tire structure are staggered in the radial direction of the tire through improving and adjusting the ratio of the end points to the axial section height of the tire in the tire structure, so that the uniform transition of the rigidity of the tire is facilitated, the end points are stress concentration points, and the staggered in the radial direction of the tire can reduce the stress concentration problem of the tire.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A small-sized all-steel tyre with high bearing performance comprises a tyre body (1), the tire body comprises a tire body (4), a tread part and a bead part, the bead part comprises a steel wire ring (6), a lower triangular rubber (7) and an upper triangular rubber (8), the width of the axial section of the tire body is less than 210mm, the height of the axial section of the tire body is less than 150mm, the outer diameter of the tire body is less than 700mm, it is characterized in that the tread part comprises shoulder pad rubber (3) which is smoothly connected and fixed with one side of the upper triangular rubber close to the tire cavity, one end of the tire body (4) close to the bead ring winds around the bead ring and extends outwards along the radial direction of the tire along one end surface of the tire which is inward along the radial direction of the tire, the width of the superposed part of the upper triangular rubber and the shoulder pad rubber along the radial direction of the tire is 5mm-30mm, the ratio of the height of an end point A of the tire body extending outwards along the radial direction of the tire to the height of the axial section of the tire is 0.19-0.28.
2. A small all-steel tire with high load-bearing performance according to claim 1, the outer end of the carcass (4) is provided with a steel wire wrapping cloth (5) wrapping one side surface of the carcass, the ratio of the height of one end point B of the steel wire wrapping cloth along the axial direction of the tire to the height of the axial section of the tire is not less than 0.13, the height of one end point B of the steel wire wrapping cloth along the axial direction of the tire is more than 2mm lower than the height of an end point A of a tire body extending outwards along the radial direction of the tire, the ratio of the height of the wire cloth along the axial inner end point D of the tire to the axial section height of the tire is not less than 0.33, the inner end point D of the steel wire wrapping cloth along the axial direction of the tire is positioned at the inner side of one end point of the shoulder pad rubber along the radial direction of the tire, the inner end point D of the steel wire wrapping cloth along the axial direction of the tire is positioned on the outer side of the lower triangular rubber along the radial outer end point of the tire along the radial direction of the tire.
3. The small-sized all-steel tire with high bearing performance as claimed in claim 2, wherein the ratio of the end point C of the lower apex radially outward of the tire to the height of the axial section of the tire is not less than 0.27, and the end point C of the lower apex radially outward of the tire is lower than the height of the inner end point D of the steel wire wrapping cloth (5) axially inward of the tire by more than 2 mm.
4. A small all-steel tire having high load-bearing performance according to claim 1, wherein the thickness of the tire side wall of said tire body at the thinnest point in the tire axial direction is not less than 11.5 mm.
5. A small all-steel tire with high load bearing capacity as in claim 3, wherein Shore hardness of the lower apex is in the range of 75 ° -95 °, Shore hardness of the upper apex and shoulder pad is in the range of 45 ° -65 °, Shore hardness difference of the upper apex and shoulder pad is not more than 5 °.
CN202010858135.7A 2020-08-24 2020-08-24 Small-size all-steel tire with high bearing performance Active CN111993846B (en)

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