WO2009099108A1 - スタッドレスタイヤ - Google Patents
スタッドレスタイヤ Download PDFInfo
- Publication number
- WO2009099108A1 WO2009099108A1 PCT/JP2009/051899 JP2009051899W WO2009099108A1 WO 2009099108 A1 WO2009099108 A1 WO 2009099108A1 JP 2009051899 W JP2009051899 W JP 2009051899W WO 2009099108 A1 WO2009099108 A1 WO 2009099108A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- vehicle
- width direction
- tire width
- vehicle mounting
- Prior art date
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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
- B60C3/00—Tyres characterised by the transverse section
- B60C3/06—Tyres characterised by the transverse section asymmetric
-
- 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
- B60C11/0327—Tread patterns characterised by special properties of the tread pattern
- B60C11/0332—Tread patterns characterised by special properties of the tread pattern by the footprint-ground contacting area of the tyre tread
-
- 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
- B60C9/0292—Carcass ply curvature
Definitions
- the present invention relates to a studless tire that is attached to a vehicle that runs on ice and snow, and particularly relates to a tire that can improve straight running stability.
- the present invention has been made in view of such problems, and an object of the present invention is to provide a studless tire that can improve straight running stability even with low tread rigidity.
- the studless tire of the present invention has predetermined cross-sectional shapes of the outer half in the vehicle width direction and the cross-sectional shape of the inner half in the vehicle width direction when mounted on the vehicle.
- Such an asymmetric tire is known as a summer tire, but has not yet been realized as a studless tire. Studless tires require high snow and snow performance, so the elastic modulus of tread rubber is extremely low compared to summer tires, making it difficult to use the asymmetry method applied to summer tires.
- An object of the present invention is to provide an asymmetry technique that can improve the straight running stability and is optimal for a studless tire having extremely low tread rigidity.
- ⁇ 1> is the maximum tire width from the bladdering split position to the tire radial direction distance B from the bladdering split position to the tread ring split position in a cross-section passing through the central axis in a state where it is attached to a predetermined rim and filled with a predetermined internal pressure.
- the side shape factor is the tire on both outer sides in the width direction of the vehicle (hereinafter referred to as the vehicle mounting outer side) when mounted on the vehicle.
- the studless tire is characterized in that it is 0.5 to 0.55 in the tire width direction half and 0.45 to 0.48 in the tire width direction half inside the vehicle.
- the peripheral length along the tire inner surface is long in the tire width direction half disposed on the vehicle mounting outer side, and is short in the tire width direction half positioned on the vehicle mounting inner side.
- the studless tire is characterized in that the difference between the peripheral lengths thereof is within 2%.
- ⁇ 3> in ⁇ 1> or ⁇ 2> is the side shape factor Xd with respect to the vehicle mounting outer side and the side shape factor Xc with respect to the vehicle mounting inner side, and is filled with the predetermined internal pressure and -0.5 ° camber under a predetermined load
- the ground contact length on the inner side of the vehicle is C and the ground length on the outer side of the vehicle is D at a position 40% of the ground width from the center in the width direction of the tire ground surface when grounded with a corner.
- the side shape asymmetry X represented by the formula (1) and the ground contact asymmetry Y represented by the formula (2) are studless tires that satisfy the formula (3).
- the peripheral length along the tire inner surface is longer in the tire width direction half disposed on the vehicle mounting outer side and shorter in the tire width direction half disposed on the vehicle mounting inner side.
- the straight running stability can be further improved.
- both the ground contact performance and the transmission performance of the steering force to the road surface can be achieved. If the length is too long, the transmission of the steering force on the road surface becomes worse.
- the tread stiffness factor Z is set to 0.7 to 1.0. It is possible to ensure both performance and straight running stability.
- FIG. 1 is a cross-sectional view showing a studless tire according to an embodiment of the present invention in a cross section passing through a central axis in a state in which the studless tire is mounted on a predetermined rim 11 and filled with a predetermined internal pressure, and the studless tire 10 includes a pair of beads.
- a pair of sidewall portions 2 is arranged on the outer side in the radial direction of the portion 1, and a tread portion 3 is arranged across the sidewall portions 2.
- Each bead portion 1 is provided with a bead core 5, and a radial carcass 4 is bridged between the bead cores 5, and the side portion is folded around the bead core 5 to bead the core 5. Locked.
- the shape of the sidewall portion 2 is located on the vehicle mounting inner side in the vehicle mounting posture in a cross section passing through the central axis in a state where the tire is mounted on the predetermined rim 11 and filled with the predetermined internal pressure. It is characterized in that the shape is different between the width direction half part and the width direction half part located outside the vehicle, specifically, with respect to the tire radial direction distance Bo, Bi from the bladder ring split position to the tread ring split position.
- the side shape factor Ao / Bo is set to 0.52 to 0.55 and the side shape factor Ai / Bi is set to 0.45 to 0.5 in the tire width direction half inside the vehicle, or the tire outside the vehicle.
- the side shape factor Ao / Bo is set to 0.5 to 0.55 in the width direction half, and the side shape factor Ai / Bi is set to 0.45 to 0.48 in the tire width direction half inside the vehicle.
- Is called side asymmetry it is 0.05 when Xd is 0.55 and Xc is 0.45, 0.01 when Xd is 0.5 and Xc is 0.48, and Xd is 0.52 and Xc is 0.5. Since it is sometimes 0.01, it can be said that the side asymmetry X of the tire of the present invention is 0.01 to 0.05.
- Po represents the point where the maximum tire width on the outer side of the vehicle gives Wt
- Pi represents the point where the maximum tire width on the inner side of the vehicle gives Wt
- the predetermined internal pressure and the predetermined rim are defined as follows. That is, the predetermined internal pressure is the air pressure corresponding to the predetermined load in the application size described in the predetermined industry standard, and the predetermined rim is the standard rim (or “Approved” in the application size described in the standard. Rim ”,“ Recommended Rim ”).
- the predetermined load in the above is the maximum load (maximum load capacity) of the single wheel in the application size described in the predetermined industrial standard.
- the tire width direction half is defined as a left and right side defined by a plane CL that passes through the center of the rim in the width direction and is orthogonal to the tire rotation center axis when the tire is mounted on a predetermined rim and filled with a predetermined internal pressure.
- a plane CL that passes through the center of the rim in the width direction and is orthogonal to the tire rotation center axis when the tire is mounted on a predetermined rim and filled with a predetermined internal pressure.
- the braiding ring position means a position on the tire surface corresponding to the boundary between the bladder ring and the side mold constituting the mold when the tire is vulcanized in the mold, and is formed by the boundary. A minute ridge extending in the circumferential direction is formed.
- the tread ring split position refers to the position on the tire surface corresponding to the boundary between the tread ring and the side mold constituting the mold when the tire is vulcanized in the mold, depending on the boundary.
- wire extended in the formed circumferential direction is formed.
- tires are mounted on the vehicle in an inclined state so that straightness is ensured so that the lower side in contact with the ground is on the outer side of the vehicle and the upper side is on the inner side of the vehicle.
- a so-called negative camber is provided in which the posture when viewed is a C-shape.
- the contact pressure shape is as shown in FIG.
- the ground contact pressure is high and the ground contact length is long in the region on the tire ground contact surface that is bordered by the center line in the width direction, the ground contact length is long, and the ground contact pressure is low and the ground contact length is short in the region outside the vehicle seat.
- the rigidity of the outer half of the vehicle mounting is made lower than the rigidity of the inner half of the vehicle mounting, so that the tread of the outer half of the vehicle mounting is reduced. It swells larger than the inner half of the vehicle.
- the first measure for making a difference in the bulging amount of the tread portion between the left and right halves as described above is that a camber angle of ⁇ 0.5 ° is filled with a predetermined internal pressure and a predetermined load.
- the ground contact length on the inner side of the vehicle at the position 40% of the ground width from the center line L in the width direction of the tire ground surface when grounded with C is C, and the ground length on the outer side of the vehicle is D.
- the present invention increases the side shape factor Xd with respect to the vehicle mounting outer side to be larger than the side shape factor Xc with respect to the vehicle mounting inner side in a state where no load is applied to the tire.
- Non-shape By making it symmetric, as shown in FIG. 3, the ground contact shape asymmetry degree Y is kept small, and this makes it possible to improve straight running stability.
- this first measure is to reduce the rigidity of the half by increasing the side shape factor with respect to the outside of the vehicle, and the mechanism is as follows. That is, in the vehicle mounting outer half having a large side shape factor, the radius of curvature Ro at the shoulder portion is smaller than the curvature radius Ri of the shoulder portion of the inner portion of the vehicle mounting as shown in FIG. Assuming that the radial carcass 4 bears most of the radial carcass 4, the radial carcass 4 having a thickness t and a radius of curvature R is subjected to a circumferential stress T expressed by the circumferential stress on the thin cylinder (4). Therefore, the circumferential stress T is large at the inner half of the vehicle mounting with a large radius of curvature and is small at the outer half of the mounting of the vehicle with a small radius of curvature.
- the circumferential stress of the radial carcass 4 on the outer half of the vehicle mounting is increased by making the side shape factor Xd with respect to the outer side of the vehicle mounting larger than the side shape factor Xc with respect to the inner side of the vehicle mounting.
- T is lowered to reduce the rigidity thereof, and thus the rigidity of the entire half part on the outer side of the vehicle mounting is lowered, and as a result, the tread part can be bulged larger than the half part on the inner side of the vehicle mounting.
- C and D in the expression (2) representing the ground shape asymmetry Y are respectively mounted on the vehicle by 40% of the total width W of the ground plane from the center line M in the width direction of the ground plane. It is defined as the ground contact length at the outer and inner width direction positions. If these lengths are the same, the ground contact surface asymmetry is zero.
- the straight running stability can be improved by optimizing the side shape factors Xd and Xc.
- the side shape factor Xd is set to 0.52 to 0.55 and the side shape factor Xc for the inside of the vehicle is set to 0.45 to 0.5, or the side shape factor Xd for the outside of the vehicle is set to 0.5 to 0.55 and the side shape factor Xc to the inside of the vehicle is attached 0.45 to 0.48, and Xd is less than 0.52 and Xc exceeds 0.5, or Xd is less than 0.5 and Xc exceeds 0.48, the side shape asymmetry X is too small.
- Xd exceeds 0.55 or Xc is less than 0.45 the side shape asymmetry X increases. Te, may experience uneven wear in addition to deteriorating the straight running stability and have become large ground contact shape asymmetry Y becomes high.
- the asymmetry degree X cannot be applied to studless tires where the tread stiffness must be kept low in order to ensure snow and snow performance, and in a studless tire, straight running stability is simply due to the low tread stiffness. Therefore, it is necessary to set the optimum side shape asymmetry degree X in consideration of the deterioration of the tire. In these respects, the optimization of the asymmetry of the studless tire is much more complicated than the summer tire.
- the tread rigidity of the studless tire it is necessary to make the tread rigidity necessary and sufficient to ensure the snow and snow performance, and the relationship between the ground shape asymmetry Y and the side shape asymmetry X is the tread. Since this greatly depends on the rigidity, a preferable range of the tread rigidity of the studless tire can be set by using this, and specifically, (Y ⁇ in Equation (3) that expresses the tread rigidity experimentally well. Assuming that 0.045) / X is called a tread stiffness factor Z, it is preferable that the stiffness factor Z is in the range of 0.7 to 1.0. However, X and Y represent the above-mentioned side shape asymmetry and ground contact shape asymmetry, respectively.
- the second measure for making a difference in the amount of bulging of the tread portion between the left and right halves is the peripheral length L2 along the tire inner surface of the outer half of the vehicle in the studless tire 10 (see FIG. 1). Is longer than the peripheral length L1 (see FIG. 1) along the tire inner surface of the inner half of the vehicle mounting, thereby further extending the tread portion of the outer half of the vehicle mounting to the inner half of the vehicle mounting. It can be swelled and is more preferable. This is because if the peripheral length is increased, the spring in the half is soft against the load acting in the tire radial direction.
- the peripheral length along the inner surface of the tire in the outer half of the vehicle is as follows.
- the rigidity of the vehicle mounting outer half can be reduced, and as a result, the tread portion can be bulged larger than the vehicle mounting inner half.
- the difference between L1 and L2 is too large, the spring in the tire width direction and the circumferential direction will be too soft and the transmission ability of steering performance will be reduced, so these differences should be within 2%. Is preferred.
- Studless tires differing only in the side shape asymmetry X were prototyped, the ground contact shape asymmetry Y and various movement performances when mounted on an actual vehicle were actually evaluated, and the tire specifications and evaluation results are shown in Table 1. .
- the size of the prototype studless tire was 195 / 65R15.
- this studless tire When mounting this tire on a vehicle, this studless tire was mounted on a rim of size 6J and filled with 200 kPa, which is a predetermined internal pressure of the tire.
- the contact shape asymmetry degree Y was measured under the conditions of a load of 4.71 N and a camber angle of ⁇ 0.5 ° according to the definition.
- the actual vehicle evaluation was performed under a load in which a tire of the above size was mounted on a rear wheel drive vehicle and 60 kg for one passenger seat was added to the driver.
- the vehicle was run at 80 km / h under the conditions given the camber angle, and the amount of wear inside the vehicle after running for 4000 km was measured. Expressed as an index. The larger the value, the greater the amount of wear and the worse the uneven wear resistance.
- the braking performance on snowy roads was expressed as an index when the vehicle was run with a vehicle with an anti-lock brake and the braking distance when fully braking from 40 km / h was measured, and the measurement result of the comparative example was taken as 100.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
2 サイドウォール部
3 トレッド部
4 ラジアルカーカス
5 ビードコア
10 スタッドレスタイヤ
Claims (3)
- 所定リムに装着され所定内圧が充填された状態における中心軸線を通る断面において、
ブラダリング割位置からトレッドリング割位置までのタイヤ半径方向距離Bに対する、ブラダリング割位置からタイヤ最大幅を与える位置までのタイヤ半径方向距離Aの比B/Aをサイド形状係数と呼ぶとき、このサイド形状係数は、車両への装着下で車両の幅方向両外側(以下、車両装着外側という)のタイヤ幅方向半部では0.52~0.55であってかつ車両への装着下で車両の幅方向内側(以下、車両装着内側という)のタイヤ幅方向半部では0.45~0.5であるか、もしくは、車両装着外側のタイヤ幅方向半部では0.5~0.55であってかつ車両装着内側のタイヤ幅方向半部では0.45~0.48であることを特徴とするスタッドレスタイヤ。 - タイヤ内面に沿ったペリフェリ長さは、前記車両装着外側に配置されるタイヤ幅方向半部で長く、車両装着内側に配置されるタイヤ幅方向半部で短く、それらのペリフェリ長さの差は2%以内であることを特徴とする請求項1に記載のスタッドレスタイヤ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009552495A JP5230658B2 (ja) | 2008-02-04 | 2009-02-04 | スタッドレスタイヤ |
EP09708172A EP2248681B1 (en) | 2008-02-04 | 2009-02-04 | Studless tire |
CN2009801072964A CN101959702B (zh) | 2008-02-04 | 2009-02-04 | 无钉防滑轮胎 |
US12/865,942 US20100326579A1 (en) | 2008-02-04 | 2009-02-04 | Studless tire |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-023920 | 2008-02-04 | ||
JP2008023920 | 2008-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009099108A1 true WO2009099108A1 (ja) | 2009-08-13 |
Family
ID=40952182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/051899 WO2009099108A1 (ja) | 2008-02-04 | 2009-02-04 | スタッドレスタイヤ |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100326579A1 (ja) |
EP (1) | EP2248681B1 (ja) |
JP (1) | JP5230658B2 (ja) |
CN (1) | CN101959702B (ja) |
RU (1) | RU2440249C1 (ja) |
WO (1) | WO2009099108A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014028569A (ja) * | 2012-07-31 | 2014-02-13 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP2016141317A (ja) * | 2015-02-04 | 2016-08-08 | 株式会社ブリヂストン | 空気入りタイヤ |
WO2023042763A1 (ja) * | 2021-09-17 | 2023-03-23 | 横浜ゴム株式会社 | タイヤ |
WO2023042764A1 (ja) * | 2021-09-17 | 2023-03-23 | 横浜ゴム株式会社 | タイヤ |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2679407B1 (en) * | 2011-02-24 | 2018-04-04 | Bridgestone Corporation | Pneumatic radial tire |
EP2682286B1 (en) * | 2011-03-04 | 2018-01-17 | Bridgestone Corporation | Pneumatic tire |
EP3335866B1 (en) * | 2016-12-19 | 2019-11-20 | The Goodyear Tire & Rubber Company | Method of manufacturing a pneumatic tire |
US10870248B2 (en) | 2018-03-23 | 2020-12-22 | Bridgestone Americas Tire Operations, Llc | Non-symmetrical tread ring parting line mold |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61188203A (ja) * | 1985-02-15 | 1986-08-21 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP2003191710A (ja) * | 2001-12-27 | 2003-07-09 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
JP2007015596A (ja) * | 2005-07-08 | 2007-01-25 | Bridgestone Corp | 乗用車用タイヤ |
WO2007072924A1 (ja) * | 2005-12-21 | 2007-06-28 | Bridgestone Corporation | 空気入りタイヤ |
JP2007176417A (ja) | 2005-12-28 | 2007-07-12 | Sumitomo Rubber Ind Ltd | スタッドレスタイヤ |
WO2008001913A1 (en) * | 2006-06-30 | 2008-01-03 | Equos Research Co., Ltd. | Control device for vehicle |
JP2009090912A (ja) * | 2007-10-11 | 2009-04-30 | Bridgestone Corp | スタッドレスタイヤ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2574150B2 (ja) * | 1986-09-24 | 1997-01-22 | 横浜ゴム株式会社 | 乗用車用ラジアルタイヤ |
JP2614452B2 (ja) * | 1987-07-08 | 1997-05-28 | 横浜ゴム株式会社 | 空気入りタイヤ |
JPH06135204A (ja) * | 1992-10-23 | 1994-05-17 | Bridgestone Corp | 空気入りタイヤ |
JP3325084B2 (ja) * | 1993-07-07 | 2002-09-17 | 三菱製紙株式会社 | インクジェット記録シート |
US7278455B2 (en) * | 2004-12-20 | 2007-10-09 | The Goodyear Tire & Rubber Company | Asymmetrical pneumatic run-flat tire |
-
2009
- 2009-02-04 US US12/865,942 patent/US20100326579A1/en not_active Abandoned
- 2009-02-04 WO PCT/JP2009/051899 patent/WO2009099108A1/ja active Application Filing
- 2009-02-04 JP JP2009552495A patent/JP5230658B2/ja active Active
- 2009-02-04 RU RU2010136987/11A patent/RU2440249C1/ru active
- 2009-02-04 CN CN2009801072964A patent/CN101959702B/zh active Active
- 2009-02-04 EP EP09708172A patent/EP2248681B1/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS61188203A (ja) * | 1985-02-15 | 1986-08-21 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP2003191710A (ja) * | 2001-12-27 | 2003-07-09 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
JP2007015596A (ja) * | 2005-07-08 | 2007-01-25 | Bridgestone Corp | 乗用車用タイヤ |
WO2007072924A1 (ja) * | 2005-12-21 | 2007-06-28 | Bridgestone Corporation | 空気入りタイヤ |
JP2007176417A (ja) | 2005-12-28 | 2007-07-12 | Sumitomo Rubber Ind Ltd | スタッドレスタイヤ |
WO2008001913A1 (en) * | 2006-06-30 | 2008-01-03 | Equos Research Co., Ltd. | Control device for vehicle |
JP2009090912A (ja) * | 2007-10-11 | 2009-04-30 | Bridgestone Corp | スタッドレスタイヤ |
Non-Patent Citations (1)
Title |
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See also references of EP2248681A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014028569A (ja) * | 2012-07-31 | 2014-02-13 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP2016141317A (ja) * | 2015-02-04 | 2016-08-08 | 株式会社ブリヂストン | 空気入りタイヤ |
WO2023042763A1 (ja) * | 2021-09-17 | 2023-03-23 | 横浜ゴム株式会社 | タイヤ |
WO2023042764A1 (ja) * | 2021-09-17 | 2023-03-23 | 横浜ゴム株式会社 | タイヤ |
Also Published As
Publication number | Publication date |
---|---|
US20100326579A1 (en) | 2010-12-30 |
EP2248681B1 (en) | 2013-01-23 |
JP5230658B2 (ja) | 2013-07-10 |
JPWO2009099108A1 (ja) | 2011-05-26 |
CN101959702A (zh) | 2011-01-26 |
EP2248681A4 (en) | 2011-10-05 |
RU2440249C1 (ru) | 2012-01-20 |
CN101959702B (zh) | 2013-06-05 |
EP2248681A1 (en) | 2010-11-10 |
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