CN109835124B - Tire capable of reducing rolling resistance and keeping seam allowance durable - Google Patents
Tire capable of reducing rolling resistance and keeping seam allowance durable Download PDFInfo
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- CN109835124B CN109835124B CN201910152161.5A CN201910152161A CN109835124B CN 109835124 B CN109835124 B CN 109835124B CN 201910152161 A CN201910152161 A CN 201910152161A CN 109835124 B CN109835124 B CN 109835124B
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Abstract
The invention provides a tire capable of reducing rolling resistance and keeping a bead durable, wherein bead protection rubber covers the lower end of sidewall rubber, the height point of the bead protection rubber is 0-5 mm lower than that of a rim protection line, the included angle of the height points of the bead protection rubber is 15-30 degrees, and the thickness of the bead protection rubber on one side of a bead ring is 1.2-1.8 mm. According to the tire bead protection device, the bead protection rubber covers the lower end of the sidewall rubber, and the high point of the bead protection rubber falls below and near the rim protection line, so that the angle of the bead protection rubber is deviated to the outer side of the tire, and the high point of the bead protection rubber is smoothly transited downwards from the rim protection line, so that the force transition problem is effectively solved, the structural design greatly reduces the proportion of the bead protection rubber in the sidewall, and the rolling resistance of the tire is greatly reduced; meanwhile, as the direction of the bead filler is deviated to the outer side of the tire, the bead filler is effectively contacted with the rim, thereby avoiding the contact of the sidewall filler and the rim caused by the forward reduction of the bead filler height, and playing a role in wear resistance.
Description
Technical Field
The invention relates to the technical field of tires, in particular to a tire for reducing rolling resistance and keeping a bead durable.
Background
In the tyre industry, because tyres are viscoelastic bodies composed of rubber, steel wires and cords, deformation is necessarily accompanied in movement, and finally energy loss is generated in the form of heat due to deformation, and the energy loss per unit driving distance is called tyre rolling resistance.
In recent years, relevant laws and regulations related to the rolling resistance of tires are successively established in countries all over the world, wherein the European tire certification regulation ECE R117 specifies that the rolling resistance of an export tire is converted from R2 to R3 standard in the month of 11 in 2020, and the reduction of the rolling resistance of the tire is forced to become the most concerned problem of each tire manufacturer due to the fuel economy and the environmental protection situation, and the reduction of the rolling resistance of the tire is imperative. The tire mainly comprises a tire tread, a tire side, apex, a cap ply, a belt ply, a tire body, an inner lining and a steel wire ring, the parts of the tire rolling resistance are generally crown parts, tire side and bead openings, the reduction of the tire rolling resistance can be realized by improving the tire tread formula, reducing the tire weight, optimizing the tire structural design and other methods, in the prior art, the performance requirements of noise, abrasion, economy, controllability, tire wetland and the like of the tire are considered at the same time, and the reduction of the tire rolling resistance has a bottleneck under the condition of not changing the tire structure.
The prior art adopts a rolling resistance reducing mode and has the following defects:
1. if the rolling resistance is reduced by improving the tread formula, the corresponding wet performance, handling performance and durability of the tire are affected;
2. if the rolling resistance is reduced by reducing the weight of the tire, the corresponding tire components are lightened, and the safety and the durability of the tire are influenced;
3. the common tire in the prior art has the disadvantages of more heat generation, larger energy consumption and extremely bad rolling resistance of the tire because the RC is arranged above the apex which is just positioned in a tire flexing area.
Ordinary semi-steel radial tire side wall RC high point falls in apex high point top among the prior art, also falls in rim guard line top simultaneously, if reduce RC's the proportion of taking up, reduces and rolls the resistance, only realizes through the height that reduces RC and the thickness of attenuate RC, nevertheless reduces RC's height and can appear following problem:
1. the RC height is reduced to be close to the apex, so that the RC high points are close to the apex, the stress is concentrated, the heat generation is large, and the durability is influenced;
2. the thickness of the thinned RC is too thin, the transition of the force between the tire side and the apex can be influenced, the too thin transition of the force is not good, and the durability and the comfort of the tire are influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides the novel structural tire which can effectively reduce the rolling resistance of the tire and can also give consideration to other performances such as durability and the like of the tire.
In order to solve the technical problems, the invention adopts the following technical scheme:
the tire capable of reducing rolling resistance and keeping the bead durable comprises a sidewall rubber, a bead filler and a bead filler located in a bead region and used for transition of the sidewall rubber and the bead filler, wherein the bead filler covers the lower end of the sidewall rubber, the height point of the bead filler is 0-5 mm lower than that of a rim protection line, the included angle of the height point of the bead filler is 15-30 degrees, and the thickness of the bead filler located on one side of a bead ring is 1.2-1.8 mm.
Further, the height of the area of the bead filler covering the sidewall rubber is H1- (0-5) mm, wherein H1 is the height of the rim protection line.
Preferably, the apex height HBF is (0.5-0.6) × SDH, where SDH is the tire lower section horizontal axis height.
Preferably, the thickness of the bead filler at one side of the bead ring is 1.4 mm-1.6 mm.
Preferably, the included angle of the high points of the bead protection rubber is 20-25 degrees.
Preferably, the tire is a PC specification tire without rim protection.
According to the technical scheme, the lower end of the tire side rubber is covered with the bead protection rubber, and the high point of the bead protection rubber is located near the lower part of the rim protection line, so that the angle of the bead protection rubber is deviated to the outer side of the tire, and the high point of the bead protection rubber is smoothly transited downwards from the rim protection line, so that the force transition problem is effectively solved, the structural design greatly reduces the proportion of the bead protection rubber in the tire side, and the rolling resistance of the tire is greatly reduced; meanwhile, as the direction of the bead filler is deviated to the outer side of the tire, the bead filler is effectively contacted with the rim, thereby avoiding the contact of the sidewall filler and the rim caused by the forward reduction of the bead filler height, and playing a role in wear resistance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the prior art.
Detailed Description
Technical term interpretation:
RC: bead protection glue
ECE R117: european Union certification regulation
R2: rolling resistance criterion
R3: rolling resistance criterion
FEA: finite element analysis
BEC: tire shoulder pad rubber
HBF: height of apex
HRC: height of bead protection glue
PC: radial tyre for car
H1: height of rim protection line
TRC: thickness of bead protection glue at bead ring
SDH: height of horizontal axis of lower section of tire
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the tire in this embodiment is a PC-sized tire without rim protection, and includes a tread 1, a sidewall 2, an apex 3, a bead ring 4, a ply 5, an inner liner 6, a belt 7, a belt 8, and a bead filler 9 located in a bead area for transition between a sidewall rubber and an apex, which are an inner liner, a carcass, a belt, a cap, a tread, and a sidewall in this order from inside to outside.
The height HBF of the triangular rubber 3 is SDH (0.5-0.6) mm, and the design can enable the triangular rubber to avoid a deflection area of a tire, so that the heat generation of the triangular rubber part is reduced to achieve the effect of reducing rolling resistance.
The curtain cloth turn-up height H1P of the curtain cloth 5 is SDH +5mm, the structural design is lighter than that of a two-layer curtain cloth, and meanwhile, the 1P high turn-up curtain cloth joint avoids a tire flexing area, ensures the rigidity of a tire body and is very beneficial to reducing the rolling resistance of the tire.
The winding tension of the cap ply 7 is 15N, the tolerance is controlled to be +/-4N, the rigidity of the tire can be improved, a belt ply can be better bound, and the method is very beneficial to reducing the rolling resistance of the tire and improving the high speed performance.
The bead protection rubber 9 covers the lower end of the sidewall rubber, the high point B direction of the bead protection rubber is deviated to the outer side of the tire due to the design, in the embodiment, the height of the region, covered by the bead protection rubber, of the bead protection rubber is H1- (0-5) mm, the direction is deviated to the outer side of the tire, H1 is the height of a rim protection line, the occupation ratio of RC in the sidewall is minimized due to the design, rolling resistance is reduced more favorably, the RC direction is effectively contacted with the rim outwards, the contact between the bead protection rubber and the rim caused by forward reduction of the RC height is avoided, and the wear-resistant effect is achieved.
Since tires are viscoelastic bodies composed of rubber, steel wires and cords, the movements are necessarily accompanied by deformations which ultimately generate energy losses in the form of heat which generate the rolling resistance of the tire, defined as the rolling resistance FR: energy loss (or energy consumption) per unit mileage, expressed as:
FR＝Eloss/C＝f(σ,,V,tan)/C
where Eloss is the energy loss of the tire, σ is the stress, is the strain, V is the tire volume, tan is the material loss angle, and C is the rolling circumference.
The rolling resistance energy consumption distribution of the tire is analyzed through finite elements, the rolling resistance energy consumption of the tire is mainly distributed on a tire crown, a tire side and a tire bead, when the tire is subjected to flexural deformation, viscoelastic resistance is generated by rubber to deformation, hysteresis heat generation is caused by alternating deformation of tire rubber, energy loss is caused by asynchronous stress and strain, the energy loss is converted into heat energy, rolling resistance is further generated, the rolling resistance energy consumption distribution can be seen, the tire bead has large heat generation, the proportion of the generated rolling resistance is high, and meanwhile, the tire bead is a stress concentrated area and is also an area where the tire is durable and often damaged. In order to ensure the performances of the tire such as durability, control, wet land and the like, the invention reduces the rolling resistance energy consumption of the tire side and the bead part by adjusting the bead protection structure, thereby achieving the purpose of reducing the rolling resistance.
The sidewall 2 is composed of sidewall rubber, bead protection rubber and BEC rubber, the sidewall mainly bears the action of flexural deformation, and the sidewall cord is protected from being damaged, and the rubber material has the characteristics that: the hardness is low, resistant flexure, ageing-resistant, and bead filler protects gluey distribution in the middle of sidewall rubber and apex, and the apex is little compared to the apex to hardness and the side wall is big to make the transition of apex and sidewall force more steady, its sizing material characteristics: high hardness and high antiwear performance. Because the two sizing materials are different, the tan material loss angle is also different, and the tan of the side wall sizing material is smaller than that of the bead edge rubber sizing material. According to the formula FR ═ f (σ, V, tan)/C, the value of tan directly influences the rolling resistance value, and based on the above principle, the rolling resistance is reduced by maximally reducing the occupation ratio of the bead filler rubber compound in the sidewall due to the large tan of the bead filler rubber compound.
As shown in FIG. 1, the high point B of the bead filler 9 is located in the vicinity of the lower part of the high point C of the rim protection line, the high point of the bead filler is 0 to 5mm lower than the high point C of the rim protection line, and the height difference between the two points is the linear distance between the two points.
The height difference between the high point B of the bead protection rubber 9 and the high point C of the rim protection line includes but is not limited to: 0mm, 1mm, 2mm, 3mm, 4mm, 5 mm. If the point B falls above the point C, the seam allowance glue protecting sizing material is exposed in the air and is not aging-resistant, and the seam allowance glue protecting exposed in the air can be aged and cracked after a long time. If the point B falls below the point C of the rim protection line and is more than 5mm, the point B is too low, so that the rim is directly connected with the sidewall rubber, and the effect of protecting the seam allowance is not achieved.
The included angle of the high point B of the bead protection glue 9 is 15-30 degrees, including but not limited to: the included angles of 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, 20 degrees, 21 degrees, 22 degrees, 23 degrees, 24 degrees, 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees and 30 degrees are preferably 20 degrees to 25 degrees, so that the design of the included angles ensures that the force transition is smoother, the heat generation is reduced, the rolling resistance is reduced, and the durability of the tire is improved.
The thickness of the bead filler on one side of the bead ring is 1.2 mm-1.8 mm, including but not limited to: 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, and the thickness is preferably 1.4mm to 1.6 mm. The thickness effectively protects the tire bead and prevents the knocking-over performance of the tire from being influenced, and the occupation ratio of RC in the tire side is smaller, so that the rolling resistance is effectively reduced.
The invention adopts the design of the bead rubber protection to reduce the proportion of the bead rubber protection rubber material to the maximum extent, the proportion of RC in the tire side is reduced, the tan of the RC rubber material is large, the proportion of the RC rubber material in the tire side is effectively reduced, the RC is successfully enabled to avoid a flexing area of the tire by adjusting the position of the RC, and the rolling resistance of the tire can be reduced according to the formula FR of the rolling resistance of the tire, namely f (sigma, V, tan)/C.
Rolling resistance and durability tests were performed for both the existing design and the inventive example,
1. and (3) durability test:
2. and (3) rolling resistance test:
3. the analytical data are as follows:
comparative example 1 is that the bead filler height is 5mm higher than the height point of the rim protection line, the TRC thickness of the bead filler on one side of the bead ring is 3mm, and the included angle theta of the bead filler height point B is 40 degrees;
comparative example 2 is that the bead filler height is 2mm higher than the rim protective line glue height, the TRC thickness of the bead filler on one side of the bead ring is 1.5mm, and the included angle theta of the bead filler height B is 22 degrees;
comparative example 3 is that the bead filler high point is 8mm lower than the high point of the rim protection line, the TRC thickness of the bead filler on the bead ring side is 1.5mm, and the included angle θ of the bead filler high point B is 22 °;
comparative example 4 is that the bead apex of bead filler is 3mm lower than the apex of rim protection line, the TRC thickness of bead filler on bead ring side is 3mm, and the bead apex B included angle θ of bead filler is 40 °.
Comparative example 5 is that the bead apex of the bead filler is 3mm lower than the apex of the rim protection line, the TRC thickness of the bead filler on the bead ring side is 1.5mm, and the included angle θ of the bead apex B of the bead filler is 40 °.
Comparative example 6 is that the bead apex of the bead filler is 3mm lower than the apex of the rim protection line, the TRC thickness of the bead filler on the bead ring side is 3mm, and the included angle θ of the bead apex B of the bead filler is 22 °.
The rolling resistance FR of the tires of examples 1 to 3 was 9.76, 9.71, 9.66, the rolling resistance FR of the tire of comparative example 1 was 10.45, the rolling resistance was reduced by about 6%, and the effect was remarkable. Therefore, the effect of better reducing rolling resistance can be achieved when three improvement points of the seam allowance glue protecting high point position, the seam allowance glue protecting thickness TRC and the high point B included angle theta exist simultaneously.
The position of the high point of the bead protection rubber of the comparative example 2 is the same as that of the comparative example 1, the thickness TRC of the bead protection rubber and the included angle theta of the high point B are both the same as those of the example 2, the rolling resistance FR of the tire is 10.25, and the rolling resistance is only slightly reduced compared with that of the comparative example 1, so that the improvement of the thickness TRC of the bead protection rubber and the included angle theta of the high point B alone can be proved to be incapable of reducing the rolling resistance of the tire.
The bead protection rubber high point of the comparative example 4 is far lower than that of the rim protection line, and the other is the same as that of the example 2 of the invention, the tire rolling resistance FR is 9.96, and the rolling resistance is only slightly reduced compared with that of the comparative example 2, so that the improvement of the included angle theta between the bead protection rubber high point and the high point B alone can not well reduce the tire rolling resistance.
The included angle θ of the high point B of the comparative example 5 is the same as that of the comparative example 1, the high point position of the bead filler and the TRC thickness are the same as those of the example 2 of the present invention, and the rolling resistance FR of the tire is 9.80, which is reduced but not much compared with that of the comparative example 1, so that it can be proved that the rolling resistance of the tire cannot be reduced well by improving the high point position and the thickness TRC of the bead filler alone.
The seam allowance rubber thickness TRC of the comparative example 6 is the same as that of the comparative example 1, the included angle theta between the high point position of the seam allowance rubber and the high point B is the same as that of the example 2, the rolling resistance FR of the tire is 9.92, and the rolling resistance FR is reduced but is reduced a little compared with that of the comparative example 1, so that the improvement of the included angle theta between the high point position of the seam allowance rubber and the high point B alone can be proved to be incapable of reducing the rolling resistance of the tire.
The design of comparative example 3 and the RC of the invention have lower occupation ratio in the tire side and lower rolling resistance, but the tire knocking-off performance is adversely affected due to the excessively low position of the bead filler high point, and the phenomenon that the bead filler can not be protected by the RC filler is caused by the contact of the sidewall filler and the rim after the excessively low position of the bead filler high point, so that the minimum RC high point is 5mm below the rim protection line.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. The tire capable of reducing rolling resistance and keeping the bead durable comprises a sidewall rubber, a bead filler and a bead filler positioned in a bead region and used for transition between the sidewall rubber and the bead filler, and is characterized in that the bead filler covers the lower end of the sidewall rubber, the height point of the bead filler is 0-5 mm lower than that of a rim protection line, the included angle of the height point of the bead filler is 15-30 degrees, and the thickness of the bead filler positioned on one side of a steel wire ring is 1.2-1.8 mm.
2. The tire of claim 1, wherein the apex has a height HBF of (0.5-0.6) × SDH, where SDH is the tire lower section horizontal axis height.
3. The tire of claim 1, wherein the bead filler has a thickness of 1.4mm to 1.6mm on the bead ring side.
4. The tire of claim 1, wherein the included high point angle of the bead filler is 20 ° to 25 °.
5. The tire of claim 1, wherein the tire is a PC-size tire without rim protection.
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| CN201910152161.5A CN109835124B (en) | 2019-02-28 | 2019-02-28 | Tire capable of reducing rolling resistance and keeping seam allowance durable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910152161.5A CN109835124B (en) | 2019-02-28 | 2019-02-28 | Tire capable of reducing rolling resistance and keeping seam allowance durable |
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| CN109835124B true CN109835124B (en) | 2021-01-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110843426B (en) * | 2019-11-29 | 2021-12-31 | 安徽佳通乘用子午线轮胎有限公司 | High-load all-steel radial tire |
| CN114132121B (en) * | 2021-11-05 | 2023-10-24 | 安徽佳通乘用子午线轮胎有限公司 | Tire with effect of improving flat spot and testing method |
| CN115848070B (en) * | 2023-02-23 | 2023-06-02 | 广饶县计量测试检定所(广饶县产品质量检验所、广饶县橡胶轮胎产品与材料质量检验中心) | Tire ring part capable of improving ring part performance, tire and inspection method |
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| JP2002166710A (en) * | 2000-12-04 | 2002-06-11 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
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