WO2008073885A2 - Pneu à affaissement limité - Google Patents

Pneu à affaissement limité Download PDF

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Publication number
WO2008073885A2
WO2008073885A2 PCT/US2007/086966 US2007086966W WO2008073885A2 WO 2008073885 A2 WO2008073885 A2 WO 2008073885A2 US 2007086966 W US2007086966 W US 2007086966W WO 2008073885 A2 WO2008073885 A2 WO 2008073885A2
Authority
WO
WIPO (PCT)
Prior art keywords
sidewall
bead
pneumatic tire
tire
insert
Prior art date
Application number
PCT/US2007/086966
Other languages
English (en)
Other versions
WO2008073885A3 (fr
Inventor
Walter Dale Allen
Richard Frank Laske
Original Assignee
The Goodyear Tire & Rubber Company
Societe De Technologie Michelin
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 The Goodyear Tire & Rubber Company, Societe De Technologie Michelin filed Critical The Goodyear Tire & Rubber Company
Publication of WO2008073885A2 publication Critical patent/WO2008073885A2/fr
Publication of WO2008073885A3 publication Critical patent/WO2008073885A3/fr

Links

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
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0018—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion not folded around the bead core, e.g. floating or down ply
    • 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
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0072—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with ply reverse folding, i.e. carcass layer folded around the bead core from the outside to the inside
    • 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
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0081—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion the carcass plies folded around or between more than one bead core
    • 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
    • B60C15/02—Seating or securing beads on rims
    • B60C15/0236—Asymmetric bead seats, e.g. different bead diameter or inclination angle
    • 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
    • B60C15/02—Seating or securing beads on rims
    • B60C15/024—Bead contour, e.g. lips, grooves, or ribs
    • B60C15/0247—Bead contour, e.g. lips, grooves, or ribs with reverse bead seat inclination, i.e. the axially inner diameter of the bead seat is bigger than the axially outer diameter thereof
    • 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
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • 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
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B60C17/0018—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts two or more inserts in each sidewall portion

Definitions

  • the present invention relates to a tire with a radial carcass reinforcement, and more particularly, to the side wall structure of the tire. It also relates to an assembly, formed by a tire and a rim.
  • the first system employs an insert set in the wheel rim that supports the underside of the tire tread when the tire is operated in an underinflated state; US 5,785,781 discloses one such system.
  • the second system employs a self-supporting tire wherein the tire sidewalls are reinforced such that during underinflated operating conditions, the tire is capable of supporting itself to permit operation; US Patents 4,365,659, 5,158,627, 5,368,082 and 6,453,961 disclose such self-supporting tires.
  • Each system has its limitations, making each system more suitable than the other system for particular applications.
  • Systems using the wheel inserts can result in strike- through for low sidewall tires and smaller tires, as well as being more complex to assemble due to the wheel mounted support; while self-supporting tires for large sidewall tires and larger tires have a larger mass, leading to a decrease in rolling resistance and comfort.
  • the present invention enables the two different solutions to cooperate to result in a simpler run-flat solution.
  • the present invention covers the range of all tire sizes and is particularly suitable for mid-size applications and combines the best features of both types of systems. Summary of the Invention
  • the present invention is directed to a run- flat tire system and a run-flat tire.
  • the tire has at least one radial carcass reinforcement ply, a belt structure, and a pair of opposing bead regions.
  • Each bead region has bead wire, a bead toe and a bead heel wherein the bead toe is axially outward and radially inward of the bead heel.
  • Radially outward of each bead region is a tire sidewall.
  • the sidewall has a cross-sectional thickness that varies along the length of the sidewall.
  • a radially inward portion of the sidewall below a sidewall minimum cross-sectional thickness W MIN has a thickness greater than a radially outer portion of the sidewall above the minimum cross-sectional thickness.
  • Wu of the radially outer sidewall portion has a cross-sectional thickness not greater than 1.2 times the sidewall minimum cross-sectional thickness W MIN -
  • the "engagement" of the the radially outer sidewall portion under the belt plies is between about 0 and about 40mm, preferably between about 20mm and about 25mm.
  • the sidewall minimum cross-sectional thickness is in a central region of the sidewall.
  • the sidewall central region is the central 20% of the sidewall length.
  • the radially inner sidewall portion has a maximum thickness in the range of about 1.20 to about 1.65 times the maximum thickness of the radially outer sidewall portion.
  • the radially inner sidewall portion has a maximum thickness in the range of about 1.3 to about 1.55 times the maximum thickness of the radially outer sidewall portion.
  • the cross-sectional thickness of the radially inner sidewall portion gradually increases from the sidewall minimum thickness to the bead region.
  • the bead rings in each bead region have differing bead diameters, forming an asymmetrical tire.
  • FIG. 1 is a cross sectional view of a tire in accordance with the invention.
  • FIG. 2 is another embodiment of the tire
  • FIGS. 3 is another embodiment of the tire.
  • FIGS. 4 is another embodiment of the tire. Detailed Description of the Invention
  • FIG. 1 illustrates a self-supporting tire in accordance with the present invention; only half of the cross-sectional view of the tire is shown, it will be understood by those skilled in the art that the opposing, non-illustrated tire half may be identical to that illustrated and possible variations from that illustrated may be disclosed herein.
  • the pneumatic tire 10 has a carcass comprising carcass reinforcement plies 12 that extend from one bead portion 14 to an opposing bead portion 14.
  • the carcass reinforcement plies 12 are formed of parallel reinforcing cords; the cords are inclined at angles of between 65° to 90° with respect to the equatorial plane EP of the tire 10.
  • the cords are formed of any conventional carcass cord materials, including, but not limited to nylon, rayon, polyester, aramid, PEN, fiberglass, steel, or any combination thereof.
  • the illustrated tire 10 is a two ply carcass; one skilled in the art would appreciate there may be only a single carcass ply or more than two carcass reinforcement plies.
  • the inner carcass reinforcement ply 12' has a main portion extending about the main toroidal portion of the tire 10 with turn-up portions extending radially under a bead ring 20 and then folding back under the bead ring 20. Each end of the inner carcass reinforcement ply 12' is sandwiched between the bead ring 20 and the main portion of the inner carcass reinforcement ply 12'. To maintain the profile of the turn-up portion, the turnup portion folds about a rubber wedge 22 located axially outward of the bead ring 20.
  • the outer carcass reinforcement ply 12" is directly adjacent to the inner carcass reinforcement ply 12'; however, the terminal ends of the ply 12" do not fully wrap about the rubber wedge 22. If the tire 10 is a single carcass ply tire, the ply will have a structure similar to the illustrated inner carcass reinforcement ply 12'.
  • the bead portion has an outer cross-sectional profile wherein as the profile moves from the axially outer side of the bead portion to the axially inner side, the bead profile slopes radially upward.
  • the bead toe 24 is both axially outward and radially inward of the bead heel 26.
  • a rib 28 Above the bead toe 24 is a rib 28 that assists in locking the tire onto a wheel rim, as discussed below.
  • This bead profile is contrary to a conventional tire wherein the bead toe is radially and axially inward of the bead heel and it is the bead heel that fits into the curved portion of the wheel rim where the rim seat and the wheel flange meet.
  • the bead ring 20 is illustrated with an overall circular configuration.
  • the bead ring 20 is an inextensible hoop of steel formed from multiple windings of steel.
  • the bead ring 20 may also have other overall configurations such as hexagonal, square or rectangular, or any combination thereof.
  • the tire also has a belt structure 30.
  • the belt structure 30 includes one to four reinforcing plies 32 of parallel cords.
  • the cords of the reinforcing ply 32 may be woven or unwoven and are inclined at angles of 15° to 35° with respect to the equatorial plane EP of the tire 10.
  • the cords of any adjacent belt plies 32 are preferably inclined in opposing directions with respect to the equatorial plane EP of the tire 10.
  • the cords of the belt plies 32 are formed of any conventional belt cord materials, including but not limited to steel, aramid, nylon, rayon, fiberglass, polyester, pen, or any combination thereof.
  • a zero degree ply may be located within or adjacent to the belt structure 30.
  • the tread 36 Radially outward of the belt structure 30 is the tire tread 36.
  • the tread 36 may have any number or pattern of circumferential or lateral grooves or combination thereof. The tread pattern is dependent upon the intended application of the tire; i.e. a small passenger vehicle, mid-size passenger vehicle, small to mid-size passenger truck, etc.
  • the tire sidewalls 40 At the axially outer edges of the tread 36 and the belt structure 30 and radially outward of the bead portions 14 are the tire sidewalls 40.
  • the sidewalls 40 initiate at the tread edge TE and terminate at a point radially outward of the bead cores 20.
  • each side wall 40 is at least one insert 44.
  • the insert 44 is lenticular in configuration, having tapered distal ends.
  • the insert 44 extends from the bead portion 14 to radially inward of the belt structure 30.
  • the illustrated insert 44 is sandwiched between the carcass reinforcement ply 12' and the tire inner liner 48.
  • the insert 44 is formed from a hard rubber, with a Shore A hardness at 100° C in a range of about 55 to about 90, with a preferred range of 60 to 70.
  • the properties disclosed in US Patent 6,230,773 are suitable for the insert 44 of the present invention. The properties may be achieved by the compound disclosed in the referenced US patent, or other compounds may be selected which yield the disclosed properties.
  • the rubber forming the insert 44 may also be flock loaded or blended with reinforcing fibers. Fibers useful may be either natural or man-made, and are characterized by having a length at least 100 times its diameter or width. Flock are particles smaller than fibers.
  • the fiber or flock loading of the rubber is in the range of 5 to 35 parts per hundred parts rubber.
  • the flock may also comprise other materials such as glass microspheres, see e.g., US 2004/22032 IAl MI Francois Bataille et al.
  • the insert's lenticular configuration maintains the carcass main portion in a desired configuration.
  • a majority of the length of the carcass reinforcement plies 12 located in the lower 50% of the tire height H are maintained an angle ⁇ of about 5° to about 50°, preferably between about 20° to about 35° relative to the equatorial plane EP of the tire 10. Maintaining the carcass ply 12 in this configuration facilitates a concave ply path, as viewed from the inside of the tire 10, thus enabling the ply 12 to be in a better state of tension under loading.
  • a second insert 50 is located radially outward of the bead ring 20 and axially outward of the carcass reinforcing plies 12.
  • This insert 50 generally has a triangular shape.
  • the height of the second insert 50 may vary, and the radial overlap of the first insert 44 and second insert 50 is in the range of about 90% to about 65% of the radial length of the second insert 50.
  • the second insert 50 preferably has a Shore A hardness equivalent to the
  • the sidewall 40 has a variation in the cross-sectional thickness; the thickness being measured as the distance between the outer surface of the tire and the innermost surface of the tire and measured perpendicular to points along the curvature of the tire sidewall.
  • the sidewall 40 has a minimum thickness W MIN in the central region of the sidewall 40.
  • the central region of the sidewall 40 is defined as the central 20% of the sidewall height Hs.
  • the radially outer portion of sidewall 40 above the minimum thickness W MIN has a thickness Wu not less than the minimum sidewall thickness W MIN , but not greater than 20% times the minimum thickness W MIN -
  • the thickness of the upper portion of the sidewall 20 is constant with only a minor increase in thickness as the sidewall progress from the sidewall midpoint to the lateral edges of the belt structure 30.
  • the radially inward portion of the sidewall has a thickness W L that gradually increases to a maximum thickness W LMAX -
  • the maximum thickness W LMAX is greater than a greatest thickness Wu m a x of the radially outer portion of the sidewall.
  • the maximum thickness W LMAX of the radially inward sidewall portion is in the range of about 1.20 to about 1.65 times a maximum thickness Wu ma ⁇ f the radially outward portion of the sidewall, preferably, 1.3 to 1.55 times Wu max -
  • the radially inner portion of the sidewall is thicker than the radially outer portion, with a preferred gradual increase in the sidewall thickness from the minimum thickness point to the bead region.
  • FIG. 2 illustrates a variation in the tire.
  • the tire sidewall 40 is provided with additional reinforcing plies 52 of fabric or steel rubber coated parallel cords.
  • the additional plies 52 are directly adjacent to the carcass plies 12.
  • the ply 52 is cut and laid so that the parallel cords are inclined at a degree of 30° to 50° relative to the circumferential direction of the tire. If two or more such plies 52 are used, the cords in the adjacent plies 52 are laid so as to be inclined in opposing directions.
  • the cords may be formed from steel, aramid, polyester, nylon, or rayon, PEN, fiberglass, or any combination thereof.
  • the presence of the ply 52 reinforces the sidewalls 40 and reduces the cross sectional area of the sidewall 40 as a portion of the tire load is carried by the plies 52.
  • the reinforcing plies 52 alternatively, may be located axially outward of the second insert 50.
  • the tire may be provided with multiple lenticular shaped inserts to create the desired sidewall strength, see FIG. 3.
  • the tire has a first elongated inserted 56 sandwiched between the tire innerliner 48 and a first carcass reinforcement ply 12'.
  • a second elongated insert 58 is sandwiched between the first and second reinforcement plies 12', 12".
  • the physical properties of the two elongated inserts 56, 58 may be identical or may vary.
  • the radially inner first insert 56 has a Shore A hardness less than that of the radially outer second insert 58.
  • the relative widths of the two inserts 56, 58 may be identical or vary. Whatever relative widths are chosen for the two inserts 56, 58, the desired width variation in the sidewall as discussed above is be maintained. [031] For each of the tires illustrated and discussed above, the opposing bead rings
  • the tire of FIG. 4 has a short sidewall 66 with a bead ring 68 of relatively greater diameter D A , and a long sidewall 70 with a bead ring 72 of relatively smaller diameter D ⁇ .
  • the tire is mounted on a tire rim having corresponding offset rim diameters to accommodate the different bead diameters.
  • Each sidewall 66, 70 regardless of length, has a varying width from the bead portion 12 to the axial edges of the belt structure 30. Any of the various embodiments of inserts and reinforcement plies discussed previously may be employed in the asymmetrical tire of the FIG. 4.
  • the relative Shore A hardness properties of the inserts 74, 76 in the opposing sidewalls 66, 70, for manufacturing simplicity, are identical, and the only difference between the inserts 74, 76 is the radial length.
  • the properties of the sidewalls 66, 70 may be different in order to vary the properties of the tire and the spring rate of the two sidewalls 66, 70.
  • the inserts 74, 76 may have different physical properties or the cross-sectional widths of the sidewalls may vary.

Landscapes

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

Abstract

L'invention concerne un pneu à affaissement limité ayant une configuration de talon faisant que l'extrémité axialement intérieure est radialement intérieure par rapport à l'extrémité axialement extérieure du talon. Le flanc de pneu, allant de la région talon au flanc supérieur, est renforcé pour former un support de type montant dans le flanc. La configuration de talon et le renfort de type montant permettent au pneu de se verrouiller sur une jante de pneu pendant une opération basse pression et d'être autoporteur.
PCT/US2007/086966 2006-12-11 2007-12-10 Pneu à affaissement limité WO2008073885A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87432506P 2006-12-11 2006-12-11
US60/874,325 2006-12-11

Publications (2)

Publication Number Publication Date
WO2008073885A2 true WO2008073885A2 (fr) 2008-06-19
WO2008073885A3 WO2008073885A3 (fr) 2008-07-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/086966 WO2008073885A2 (fr) 2006-12-11 2007-12-10 Pneu à affaissement limité

Country Status (1)

Country Link
WO (1) WO2008073885A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2196334A2 (fr) 2008-12-12 2010-06-16 The Goodyear Tire & Rubber Company Pneu autoportant avec pli optimisé
WO2015159468A1 (fr) * 2014-04-14 2015-10-22 株式会社ブリヂストン Pneu à roulage à plat
JP2017190002A (ja) * 2016-04-12 2017-10-19 住友ゴム工業株式会社 空気入りタイヤ
WO2023194021A1 (fr) * 2022-04-08 2023-10-12 Compagnie Generale Des Etablissements Michelin Pneumatique à haute capacité de charge surveillé en pression

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050236085A1 (en) * 2004-04-22 2005-10-27 Markoff Michael S Pneumatic run-flat tire
US7025846B2 (en) * 2000-12-22 2006-04-11 Pirelli Pneumatici S.P.A. Self-supporting tyre for vehicle wheels and method for manufacturing the same
US7059373B2 (en) * 2001-01-17 2006-06-13 Michelin Recherche Et Technique S.A. Tire with additional ring and bead having a seat inclined towards the outside

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7025846B2 (en) * 2000-12-22 2006-04-11 Pirelli Pneumatici S.P.A. Self-supporting tyre for vehicle wheels and method for manufacturing the same
US7059373B2 (en) * 2001-01-17 2006-06-13 Michelin Recherche Et Technique S.A. Tire with additional ring and bead having a seat inclined towards the outside
US20050236085A1 (en) * 2004-04-22 2005-10-27 Markoff Michael S Pneumatic run-flat tire

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2196334A2 (fr) 2008-12-12 2010-06-16 The Goodyear Tire & Rubber Company Pneu autoportant avec pli optimisé
EP2196334A3 (fr) * 2008-12-12 2013-08-28 The Goodyear Tire & Rubber Company Pneu autoportant avec pli optimisé
WO2015159468A1 (fr) * 2014-04-14 2015-10-22 株式会社ブリヂストン Pneu à roulage à plat
JP2015202765A (ja) * 2014-04-14 2015-11-16 株式会社ブリヂストン ランフラットタイヤ
CN106170405A (zh) * 2014-04-14 2016-11-30 普利司通股份有限公司 漏气续跑轮胎
JP2017190002A (ja) * 2016-04-12 2017-10-19 住友ゴム工業株式会社 空気入りタイヤ
WO2023194021A1 (fr) * 2022-04-08 2023-10-12 Compagnie Generale Des Etablissements Michelin Pneumatique à haute capacité de charge surveillé en pression
FR3134345A1 (fr) * 2022-04-08 2023-10-13 Compagnie Generale Des Etablissements Michelin Pneumatique à haute capacité de charge surveillé en pression

Also Published As

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