CN112744034A - Run flat tire - Google Patents

Run flat tire Download PDF

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Publication number
CN112744034A
CN112744034A CN202011519280.9A CN202011519280A CN112744034A CN 112744034 A CN112744034 A CN 112744034A CN 202011519280 A CN202011519280 A CN 202011519280A CN 112744034 A CN112744034 A CN 112744034A
Authority
CN
China
Prior art keywords
tire
shoulder
run
tread
flat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011519280.9A
Other languages
Chinese (zh)
Inventor
纵封成
陆扬
王冠
方晓云
金奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cheng Shin Tire and Rubber China Co Ltd
Original Assignee
Cheng Shin Tire and Rubber China Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cheng Shin Tire and Rubber China Co Ltd filed Critical Cheng Shin Tire and Rubber China Co Ltd
Priority to CN202011519280.9A priority Critical patent/CN112744034A/en
Publication of CN112744034A publication Critical patent/CN112744034A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1259—Depth of the sipe
    • 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
    • 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
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • 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
    • B60C2011/013—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered provided with a recessed portion
    • 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
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1259—Depth of the sipe
    • B60C2011/1268—Depth of the sipe being different from sipe to sipe

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

Abstract

The invention discloses a run-flat tire, which sets the rubber thickness between a main groove and a belt part to be unequal, adopts a steel wire annular belt part and a hump-resistant annular belt part to form the belt part, sets the steel wire annular belt part to be high in rigidity, sets the hump-resistant annular belt part to be high in tension, sets the tensions of different parts of the hump-resistant annular belt part to be unequal, and sets the area of pattern blocks at the shoulder part of a tread to be larger than the area of pattern blocks at the middle part of the tread. The run-flat tire can maintain a large ground contact area even under low pressure, and thus has good grip performance even under low pressure.

Description

Run flat tire
Technical Field
The invention relates to the technical field of tires, in particular to a run-flat tire.
Background
The run-flat tire can still be normally used after air leakage, and can still safely run for about 80 kilometers at normal speed per hour (about 80 kilometers per hour) under the condition of complete phosgene leakage. This characteristic is achieved primarily by reinforcing the sidewall strength.
The run-flat tire has a good grounding shape under a normal air pressure condition and a large effective grounding area. However, since the sidewall strength of the run-flat tire is strong, the tire shoulder pressure is large due to a small amount of deformation of the sidewall under a low air pressure (0 to 80KPa), and a part of the tread cap ground contact region is lifted up and suspended, so that the effective ground contact area is reduced, and the ground gripping performance is greatly lowered.
In view of the above, how to improve the grip performance of the run-flat tire under a low air pressure is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a run-flat tire, wherein a tread of the tire is provided with a central main groove and two tire shoulder main grooves, the central main groove is positioned between the two tire shoulder main grooves, and the rubber thickness S between the central main groove and a belt part of the tireaGreater than the rubber thickness S between the main groove of the tire shoulder and the belt of the tireb。
Optionally, a rubber thickness S between the central main groove and a belt of the tireaAnd a rubber thickness S between the shoulder main groove and a belt portion of the tirebIs configured to: 1.1 < Sa/Sb＜1.3。
Optionally, the tread comprises a tread middle part positioned between the two shoulder main grooves and a tread shoulder part positioned outside the two shoulder main grooves, and the total area A1 of the blocks on the tread middle part is smaller than the total area A2 of the blocks on the two tread shoulder parts.
Optionally, the ratio of the total area a1 of the blocks in the middle of the tread to the ground-contact area a of the tire is: 40 percent to A1/A is less than or equal to 45 percent, and the proportion of the total area A2 of the blocks on the two tread shoulder parts to the ground contact area A of the tire is as follows: A2/A is more than or equal to 55% and less than or equal to 60%.
Optionally, the belt comprises a bead ring portion and a ring-resistant portion, the ring-resistant portion being disposed outside the bead ring portion.
Optionally, the steel wire girdle part has a section strength in a range of: 1.3KN to 2.0KN, wherein the cross-section swelling-resistant tension range of the swelling-resistant ring belt part is as follows: 10N-30N. Optionally, the hump-resistant annular belt part comprises shoulder areas on two side shoulder positions and a central area between the shoulder areas, and the hump-resistant tension F of the shoulder areasSHGreater than the bulge resistance F of the central zoneCL。
Optionally, a hump resistance tension F of said shoulder areaSHResistance to swelling tension F with the central zoneCLIs configured to: f is more than 1.5SH/FCL＜3.5。
Optionally, the tire further comprises a cord fabric layer, the cord fabric layer is arranged on the inner side of the steel wire annular belt part, the anti-hump annular belt part extends onto the cord fabric layer along one side of the tire axial direction far away from the tire center so as to form an included angle with the cord fabric layer, and the steel wire annular belt part extends into the included angle along one side of the tire axial direction far away from the tire center.
Optionally, the tire further comprises a sidewall portion, and a sidewall reinforcing rubber is arranged on one side of the sidewall portion, which is close to the center of the tire along the axial direction of the tire.
The run-flat tire provided by the invention has the advantages that the rubber thickness between the main groove and the belt is set to be unequal, the belt is formed by adopting the steel wire annular belt part and the anti-bulge annular belt part, the steel wire annular belt part is set to be high in rigidity, the anti-bulge annular belt part is set to be high in tension, the tensions of different parts of the anti-bulge annular belt part are set to be unequal, and the area of the pattern block at the shoulder part of the tread is set to be larger than that of the pattern block at the middle part of the tread. The run-flat tire can maintain a large ground contact area even under low pressure, and thus has good grip performance even under low pressure.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of a run-flat tire provided in accordance with the present invention;
FIG. 2 is a tread view of one embodiment of a run-flat tire provided in accordance with the present invention.
The reference numerals are explained below:
1, 11 tire shoulder main grooves, 12 central main grooves, 13 tire shoulder parts and 14 tire middle parts;
2, a belt part, 21 a steel wire belt part, 22 a hump-resistant belt part, 221 a shoulder area, 222 a central area and an alpha intersection included angle;
3 ply layers;
4, sidewall reinforcing glue.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
In the description of the present invention, a position relatively close to the tire center in the tire radial direction is referred to as "inner", and a position relatively far from the tire center in the tire radial direction is referred to as "outer".
As shown in fig. 1, the side portion of the run-flat tire is provided with a side reinforcing rubber 4 on one side (i.e., the right side of the left sidewall portion and the left side of the right sidewall portion) near the center of the tire in the axial direction of the tire, and the side reinforcing rubber 4 allows the tire to be used normally for a certain period of time in the run-flat state.
The tread 1 of the run-flat tire is provided with two tire shoulder main ditches 11 and two central main ditches 12, and the two central main ditches 12 are positioned between the two tire shoulder main ditches 11. In practical implementation, only one central main groove 12 may be provided.
Rubber thickness S between the central main groove 12 and the belt 2 of the tireaGreater than the rubber thickness S between the shoulder main groove 11 and the belt 2 of the tirebBy the arrangement, the ground contact shape of the tire can be changed during running, so that the ground contact area of the tire under the low-pressure condition is increased, and the wet drainage performance and the silencing performance of the tire are basically not influenced.
Specifically, the rubber thickness S between the central main groove 12 and the belt 2 of the tireaThe rubber thickness S between the shoulder main groove 11 and the belt 2 of the tirebMay be configured to: 1.1 < (R) >Sa/Sb＜1.3。
As shown in fig. 2, the tread 1 includes a tread middle portion 14 between the two shoulder main grooves 11 and a tread shoulder portion 13 outside the two tread 1 main grooves.
The total area a1 of the blocks on the tread middle portion 14 is smaller than the total area a2 of the blocks on the two tread shoulder portions 13, so that the shoulder rigidity is improved, the shoulder deformation amount of the tire under the low-pressure condition is reduced, and the ground contact area of the tire under the low-pressure condition can be further increased.
It is preferable to reduce the area of the blocks in the tread middle portion 14 while increasing the area of the blocks in the tread shoulder portion 13 so as to ensure that the total area of the blocks of the tire is constant, so that the total occupation ratio of the grooves (the ratio of the area of the pattern hooks to the ground contact area of the tire) is constant, so that the drainage/snow biting performance of the tire is not lowered while the rigidity of the shoulder is improved, and the wet grip performance is not lowered.
Specifically, the preferred ratio of the total area a1 of the blocks in the tread center portion 14 to the tire contact patch a is: 40 percent to A1/A to 45 percent, and the preferable proportion of the total area A2 of the blocks on the two tread shoulder parts 13 to the tire ground contact area A is as follows: A2/A is more than or equal to 55% and less than or equal to 60%.
As shown in fig. 1, the belt 2 specifically includes a bead ring portion 21 and a ring-resistant portion 22, and the ring-resistant portion 22 is provided outside the bead ring portion 21. With the adoption of the arrangement, the deformation of the whole tread 1 of the tire under the low-pressure condition can be reduced, so that the shaking of the tire caused by deformation can be relieved, and the control stability and the comfort of the tire are improved.
The rigidity of the steel wire loop part 21 is set to be large and the tension of the torus belt part 22 is also set to be large, so that the deformation amount of the whole tread 1 of the tire under low pressure is reduced, the ground contact area of the tire under low pressure can be further increased, and the drainage performance of the tire can be improved. However, the stiffness value of the bead ring portion 21 and the tension value of the ring-resistant portion 22 are not too large, and if they are too large, the comfort and noise performance of the tire are impaired.
The cross-sectional strength range of the bead ring portion 21 is preferably configured such that: 1.3KN to 2.0KN, the cross-sectional expansion-resistant tension range of the expansion-resistant zone portion 22 is preferably arranged such that: 10N-30N.
Preferably, the hump resistance zone 22 comprises shoulder regions 221 at the positions of both side shoulders and a central region 222 between the shoulder regions 221, and the hump resistance tension FSH of the shoulder regions 221 is greater than the hump resistance tension FCL of the central region 222, so that the hump resistance zone 22 has different tensions at different parts. With this arrangement, the adverse effect of the increase in tension of the loop band 22 on the tire comfort and noise performance can be reduced. Specifically, the tonoplast resistance FSH of the shoulder region 221 and the tonoplast resistance FCL of the central region 222 are preferably configured as: 1.5 < FSH/FCL < 3.5.
Specifically, the ridge tension F of the shoulder area 221 can be achieved by making the number of belt layers in the shoulder area 221 larger than the number of belt layers in the central area 222SHGreater than the bulge resistance force F of the central region 222CLThe purpose of (1). This approach is shown in the figure, where the shoulder area 221 is provided with two hoop-resistant layers and the central area 222 is provided with one hoop-resistant layer. Alternatively, the ridge tension F of the shoulder region 221 can be achieved by making the strip stiffness of the shoulder region 221 greater than the strip stiffness of the central region 222SHGreater than the bulge resistance force F of the central region 222CLThe purpose of (1).
As shown in fig. 1, the tire is further provided with a ply 3, the ply 3 being disposed inside the bead band part 21. The shoulder region 221 of the torus ring extends onto the ply 3 on the side axially away from the tire center (i.e., on the left side of the left shoulder region 221 and on the right side of the right shoulder region 221) so as to intersect the ply 3 at an angle α. One side of the steel wire annular belt part 21, which is far away from the center of the tire along the axial direction (namely, the left side and the right side of the steel wire annular belt part 21) respectively extends into the included angle alpha of the corresponding side, and by adopting the structure, the integral rigidity of the belt part 2 can be improved, so that the ground contact area under the condition of low pressure of the tire is favorably increased.
Under the normal pressure condition, the under-inflated protection tire adopting the arrangement has the advantages that the ratio of the vertical radial force to the tire load is between 6.8 and 8.4 percent, the ratio of the axial force to the tire load is between 4.5 and 6.2 percent, the ratio of the horizontal radial force to the tire load is between 5.9 and 7.8 percent, and the ratio of the turning horsepower to the tire load is between 33.5 and 39.8 percent.
In summary, the present solution improves the grip performance of the run-flat tire under low air pressure mainly by the following means:
a, setting the rubber thickness between a tread main groove and a tire belt part to be unequal;
the belt part B adopts the combination of a steel wire annular belt part and a ring-shaped belt part with high rigidity, the ring-shaped belt part with high tension is arranged, and the tensions of different parts of the ring-shaped belt part with unequal tension;
c, setting the area of the pattern blocks at the shoulder parts of the tread to be larger than the area of the pattern blocks at the middle part of the tread.
The run-flat tire provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A run-flat tire is characterized in that a central main groove (12) and two tire shoulder main grooves (11) are arranged on a tire surface (1) of the tire, the central main groove (12) is positioned between the two tire shoulder main grooves (11), and the rubber thickness S between the central main groove (12) and a belt portion (2) of the tireaIs greater than the rubber thickness S between the tire shoulder main groove (11) and the belt (2) of the tireb。
2. Run-flat tyre according to claim 1, characterized in that the rubber thickness S between the central main groove (12) and the belt (2) of the tyreaAnd a rubber thickness S between the shoulder main groove (11) and a belt portion (2) of the tirebIs configured as：1.1＜Sa/Sb＜1.3。
3. Run-flat tire according to claim 2, wherein the tread (1) comprises a tread central portion (14) located between the two shoulder main grooves (11) and tread shoulder portions (13) located outside the two shoulder main grooves (11), the total area a1 of the blocks in the tread central portion (14) being smaller than the total area a2 of the blocks in the two tread shoulder portions (13).
4. A run-flat tire as claimed in claim 3, wherein the ratio of the total area a1 of the blocks in the tread middle (14) to the ground contact area a of the tire is: 40 percent to A1/A is less than or equal to 45 percent, and the proportion of the total area A2 of the blocks on the two tread shoulder parts (13) to the ground contact area A of the tire is as follows: A2/A is more than or equal to 55% and less than or equal to 60%.
5. The run-flat tire according to claim 4, wherein the belt portion (2) includes a steel cord portion (21) and a band portion (22), the band portion (22) being provided outside the steel cord portion (21).
6. Run-flat tire according to claim 5, wherein the steel cord portion (21) has a section strength in the range of: 1.3KN to 2.0KN, wherein the cross-sectional expansion-resistant tension range of the expansion-resistant loop band part (22) is as follows: 10N-30N.
7. Run-flat tyre according to claim 6, characterized in that said anti-doming band (22) comprises shoulder zones (221) at the two side shoulder positions and a central zone (222) between the two shoulder zones (221), the anti-doming tension F of the shoulder zones (221) being such as to be able to withstand the doming tension FSHGreater than the bulge resistance F of the central zone (222)CL。
8. Run-flat tyre according to claim 7, characterized in that the hump tension resistance F of said shoulder region (221)SHAnd the centerBulge resistance F of the region (222)CLIs configured to: f is more than 1.5SH/FCL＜3.5。
9. Run-flat tire according to claim 5, further comprising a ply (3), the ply (3) being disposed inside the bead band (21), the carina band (22) extending onto the ply (3) along a side of the tire axially remote from the tire center so as to intersect the ply (3) to form an included angle (α), the bead band (21) extending into the included angle (α) along the side axially remote from the tire center.
10. Run-flat tire according to any one of claims 1 to 9, further comprising a sidewall portion provided with a sidewall reinforcing rubber (4) on a side near the center of the tire in the axial direction of the tire.
CN202011519280.9A 2020-12-21 2020-12-21 Run flat tire Pending CN112744034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011519280.9A CN112744034A (en) 2020-12-21 2020-12-21 Run flat tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011519280.9A CN112744034A (en) 2020-12-21 2020-12-21 Run flat tire

Publications (1)

Publication Number Publication Date
CN112744034A true CN112744034A (en) 2021-05-04

Family

ID=75648107

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011519280.9A Pending CN112744034A (en) 2020-12-21 2020-12-21 Run flat tire

Country Status (1)

Country Link
CN (1) CN112744034A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103802609A (en) * 2012-11-05 2014-05-21 东洋橡胶工业株式会社 Pneumatic tyre
CN106394136A (en) * 2015-07-29 2017-02-15 东洋橡胶工业株式会社 Pneumatic tire
CN110944854A (en) * 2017-07-27 2020-03-31 株式会社普利司通 Tyre for vehicle wheels
CN111405991A (en) * 2017-12-06 2020-07-10 横滨橡胶株式会社 Pneumatic tire
CN111433048A (en) * 2017-12-18 2020-07-17 株式会社普利司通 Pneumatic tire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103802609A (en) * 2012-11-05 2014-05-21 东洋橡胶工业株式会社 Pneumatic tyre
CN106394136A (en) * 2015-07-29 2017-02-15 东洋橡胶工业株式会社 Pneumatic tire
CN110944854A (en) * 2017-07-27 2020-03-31 株式会社普利司通 Tyre for vehicle wheels
CN111405991A (en) * 2017-12-06 2020-07-10 横滨橡胶株式会社 Pneumatic tire
CN111433048A (en) * 2017-12-18 2020-07-17 株式会社普利司通 Pneumatic tire

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Application publication date: 20210504