WO1982004225A1 - Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement - Google Patents

Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement Download PDF

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Publication number
WO1982004225A1
WO1982004225A1 PCT/US1981/000759 US8100759W WO8204225A1 WO 1982004225 A1 WO1982004225 A1 WO 1982004225A1 US 8100759 W US8100759 W US 8100759W WO 8204225 A1 WO8204225 A1 WO 8204225A1
Authority
WO
WIPO (PCT)
Prior art keywords
rim
tire
set forth
contacting surface
closed torus
Prior art date
Application number
PCT/US1981/000759
Other languages
English (en)
Inventor
Tractor Co Caterpillar
Original Assignee
Grawey Charles E
Groezinger John J
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 Grawey Charles E, Groezinger John J filed Critical Grawey Charles E
Priority to AU74129/81A priority Critical patent/AU7412981A/en
Priority to PCT/US1981/000759 priority patent/WO1982004225A1/fr
Priority to EP19810901862 priority patent/EP0080459A4/fr
Priority to JP50229581A priority patent/JPS58500849A/ja
Priority to CA000402121A priority patent/CA1168135A/fr
Priority to BE0/208078A priority patent/BE893166A/fr
Priority to IT21586/82A priority patent/IT1152226B/it
Publication of WO1982004225A1 publication Critical patent/WO1982004225A1/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
    • B60C15/02—Seating or securing beads on rims
    • B60C15/0233—Securing tyres without beads; Securing closed torus or tubular tyres

Definitions

  • This invention relates generally to tire construction and more particularly to means for improving the interference fit between a beadless tire 10 and a rim upon which it is mounted.
  • This rolling resistance 25 is the aerodynamic drag on the tire.
  • the aerodynamic losses typically are insignificant, amounting to no more than a few percent of the total rolling resistance losses. Additionally, in light of design constraints on tires, little can be done to significantly decrease
  • a second source of rolling resistance is j j. tire-to-ground frictional loss. This is generally 10-30% of the rolling resistance losses of a tire.
  • This deformation also tends to result in movement of the tire across the rim which supports it. This motion occurs cyclically, with the greatest motion across the tire-rim interface occurring at the point at which the tire is most greatly loaded. This motion can be either circumferential or axial and results in both cases in chaffing friction between the rim and tire.
  • Existing tires generally incorporate some type of inextensible band, e.g. a bead restraining band or a roll restraining hoop, for providing an interference fit' between the tire and the rim on which it is mounted.
  • a bead restraining band or a roll restraining hoop for providing an interference fit' between the tire and the rim on which it is mounted.
  • closed torus tires there is a substantial area of contact between the tire and rim intermediate each rim edge and the corresponding roll restraining hoop. Consequently, most closed torus tires have a flexible rim contact area outboard from and not under compression from the roll restraining hoop. See, for example, U.S. patent 4,043,370 issued to Urwin et al. on August 23, 1977 disclosing a large shoulder area on a closed torus tire including portions significantly separated fron the roll restraining hoop. It is believed that such areas are particularly prone to suffer the previously discussed tire-rim motion the elimination
  • the present invention is directed to overcoming one or more of the problems as set forth above.
  • a tire has a rim contacting portion and an inner surface. Reinforcing elements are located intermediate said rim
  • the present invention provides increased preloading to the rim contacting portion of the tire resulting in a stronger interference fit between the tire and the rim. This is achieved by placing a circumferentially extending band, loop or coil of metal or some other substantially inextensible material adjacent or abutting the rim contacting portion of the tire. The improvement achieved in this interference fit serves to improve the resistance to relative motion between the tire and rim.
  • Fig. 1 shows in cross section a tire incorporating an embodiment of the present invention, the tire being mounted on a two-piece rim;
  • Fig. 2 shows in cross section through a tire a second embodiment of the present invention used in conjunction with a one-piece rim
  • Fig. 3 shows a detail of the segmented band of the embodiment shown in Fig. 2; this segmented band is shown in top view relative to the cross section of Fig.
  • a wheel 10 has a tire 12 mounted on a rim 14.
  • This tire 12 is shown for the purposes of example as a closed torus tire (that is, a beadless tire) but it should be understood that the present invention may also be applied to certain types of beaded tires.
  • the closed torus tire 12 has inner and outer surfaces 16,18, separated by the tire carcass 20.
  • a radial ply 22 passes through the carcass 20 and is positioned intermediate the inner and outer surfaces 16,18.
  • the outer surface 18 has an outer surface outer diameter 24 abutting a tread portion 25 of the tire 12, and an outer surface inner diameter 26 which includes a rim contacting surface 28.
  • an inner diameter inner surface 30 Corresponding to the inner diameter outer surface 26 and separated therefrom by the tire carcass 20 is an inner diameter inner surface 30, which forms a portion of the tire inner surface 16.
  • a pair of roll restraining hoops 32 are positioned to restrain the closed torus tire 12 from becoming dislocated with respect to the rim 14.
  • the roll restraining hoops 32 are fashioned of substantially inextensible members such as rubber-imbedded wire and are so sized that when the tire 12 is correctly positioned on the rim 16 the carcass material intermediate each roll restraining hoop 32 and that portion of the rim 14 nearest it is in compression. That is, the roll restraining hoops 32 are sized to provide an interference fit between the tire 12 and the rim 14.
  • the purpose of this interference fit is twofold. First, it is intended to prevent circumferential rotation of the tire 12 relative the rim 14. Second, this interference fit, coupled with the angled rim 14, prevents significant axial movement of the tire 12 relative the rim 14.
  • the roll restraining hoops 32 are positioned inward from a rim edge 36.- This permits the radial ply 22 to flex in a portion of the tire 12 where a sidewall 35 of the tire 12 joins the rim contacting portion of the tire 12. Due to the roll restraining hoops 32 being offset inwardly from this boundary of tire 12-rim 14 contact, this flexing is not deleteriously restrained by the roll restraining hoops 32. As will be appreciated by those skilled in the art, were the roll-restraining hoops 32 located outward from their proper positions so as to be adjacent the rim edge 36, the required flex of the radial ply 22 would be limited to a smaller portion of this radial ply 22.
  • the carcass 20 of the closed torus tire 12 has a shoulder 34 extending from each roll resisting hoop 32 to the adjacent rim edge 36 and being intermediate the rim 14 and the radial ply 22.
  • these shoulders 34 each contain at least one strengthening member 38.
  • the strengthening members 38 are preferably substantially inextensible elements positioned within the shoulder 34 and extending circumferentially through the tire 12.
  • These substantially inextensible elements 38 are preferably formed of a coil of metal or cord passing through each shoulder 34 as shown in Fig. 1. This coil has a plurality of continuous loops extending circumferentially through each shoulder 34 and being substantially coaxial with the tire 12.
  • these strengthening members 38 can be a plurality of coaxial closed loops of such material. It should also be understood that the strengthening member 38 can be a single closed loop of metal or cord passing through each shoulder 34.
  • the strengthening members 38 are located intermediate the radial ply 22 and the rim contacting surface 28 of each shoulder 34.
  • the term “intermediate” is intended to mean “between or in contact with.”
  • a portion of each strengthening member 38 may form a portion of the rim contacting surface 28 of the tire 12.
  • the strengthening members 38 irrespective of their configuration, should be of a construction sufficient to establish an improved interference fit between the rim 14 contacting portion of the shoulder 34 and the rim 14. More particularly, these strengthening members 38 are adopted to render the rim contacting portion of the shoulder less susceptible to circumferential expansion, and be sized to induce compression of the carcass material intermediate the strengthening members 38 and the rim.
  • the strengthening member 38 can include a segmented band 40.
  • This segmented band 40 is a band of metal or some other substantially inextensible substance having periodic slits on alternate sides thereof.
  • One such segmented band 40 is bonded into each shoulder 34 with one face exposed and forming at least a portion.of the rim contacting surface 28 of the tire 12. Owing to the segmentation, the band 40 is slightly extensible in diameter when placed in tension which facilitates mounting of the tire 12 on the rim, improves interference fit, and decreases the area of rubber-to-metal interface.
  • segmented band may be set totally within the shoulder 34 eliminating the area of metal-to-metal contact.
  • the strengthening members 38 may be incorporated in tires to be mounted on a variety of rims 14.
  • the present invention may be utilized in conjunction with a two-piece rim 14 as shown in Fig. 1, or in conjunction with a one-piece rim as shown in Fig. 2.
  • the use of a rim 14 having an outer lip 46 to physically restrain the shoulder 34 from outward axial motion is especially advantageous.
  • Such an embodiment is shown in Fig. 1.
  • this physical restraint of the shoulder 34 is achieved by the outer lip 46 contacting the sidewall 35 at a region adjacent the shoulder 34. This point of contact is indicated by the reference numeral 48 on Fig. 1.
  • a roll restraining hoop 32 establishes an interference fit between the inner diameter of the tire 12 and the rim 14.
  • This interference fit must be substantial since any significant axial slippage-of the entire tire 12 on the rim 14 could permit the tire 12 to become dislodged from the rim 14. Furthermore, any substantial circumferential slippage could result in damage to the tire 12 as by damaging the valve stem.
  • There are certain design limitations relating to the placement of roll restraining hoops in closed torus tires which limit their use in immobilization of the rim contacting surface 28 of the tire 12. Carcass material, especially carcass material containing plies, is superior in compression than it is in tension, assuming an application of force perpendicular to the plane of the plies.
  • the radial ply 22 be positioned intermediate the roll resisting hoop 32 and the rim contacting surface 28. This prevents potential tensile forces from being placed on the tire material positioned between the roll resisting hoop 32 and the radial ply 22. Additionally, as discussed at some length above, the roll resisting hoop 32 should be positioned a significant axial distance inward from the rim edge 36. Under these limitations, a substantial portion of the shoulder 34 is removed from compression by the roll resisting hoop 32 and, hence, is in an inadequate interference fit with the rim 14 it abuts.
  • rim contacting surface 28 of the tire 12 is preferably, due to the exigencies of molding, straight or convex in axial cross section. As the tire is inflated this rim contacting surface 28 tends to pull away from the rim 14 decreasing the force applied by this surface 28 to

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

Une roue (10) possede une jante (14) sur laquelle est monte un pneu (12). Le pneu (12) possede une partie de contact avec la jante (28) et un talon ou un bandage resistant au roulement (32). Un organe de renforcement (38) sensiblement inextensible et s'etendant sur la circonference est monte dans le pneu (12) a proximite de la partie de contact de la jante (28) pour accroitre le frottement par interference entre la partie de contact de la jante (28) et la jante (14) et pour rigidifier la partie de contact de la jante (28). Dans bon nombre de pneus existants l'on remarque un glissement de la partie de contact avec la jante (28) par rapport a la jante (14). Dans beaucoup de cas cette abrasion n'est pas prononcee et/ou localisee. Elle se traduit par une usure de la partie de contact avec la jante (28), une augmentation de la resistance au roulement du pneu, et produit un echauffement. En rigidifiant la gomme a proximite de la jante (14) et en accroissant le frottement par interference entre le pneu (12) et la jante (14), ainsi que le permet la presente invention, ce deplacement relatif est reduit ou elimine.
PCT/US1981/000759 1981-06-08 1981-06-08 Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement WO1982004225A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU74129/81A AU7412981A (en) 1981-06-08 1981-06-08 Improvement in tire construction for decreasing rolling resistance
PCT/US1981/000759 WO1982004225A1 (fr) 1981-06-08 1981-06-08 Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement
EP19810901862 EP0080459A4 (fr) 1981-06-08 1981-06-08 Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement.
JP50229581A JPS58500849A (ja) 1981-06-08 1981-06-08 転動抵抗を低減するためのタイヤ構造の改良
CA000402121A CA1168135A (fr) 1981-06-08 1982-05-03 Pneu a resistance reduite au roulement
BE0/208078A BE893166A (fr) 1981-06-08 1982-05-13 Perfectionnement apporte a la construction des bandages de roues en vue d'une diminution et leur resistance au roulement
IT21586/82A IT1152226B (it) 1981-06-08 1982-05-31 Perfezionamenti nella costruzione di pneumatici per diminuire la resistenza al rotolamento

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1981/000759 WO1982004225A1 (fr) 1981-06-08 1981-06-08 Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement
WOUS81/00759810608 1981-06-08

Publications (1)

Publication Number Publication Date
WO1982004225A1 true WO1982004225A1 (fr) 1982-12-09

Family

ID=22161268

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1981/000759 WO1982004225A1 (fr) 1981-06-08 1981-06-08 Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement

Country Status (6)

Country Link
EP (1) EP0080459A4 (fr)
JP (1) JPS58500849A (fr)
AU (1) AU7412981A (fr)
BE (1) BE893166A (fr)
IT (1) IT1152226B (fr)
WO (1) WO1982004225A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727653A1 (fr) * 1994-12-05 1996-06-07 Michelin & Cie Profil meridien du retournement d'une carcasse radiale de pneumatique
WO2001036219A1 (fr) * 1999-11-18 2001-05-25 Société de Technologie Michelin Pneumatique avec zone basse comportant une concentration de fils

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915102A (en) * 1955-07-11 1959-12-01 Ind Ovens Inc Pneumatic tire
GB1047921A (en) * 1963-01-31 1966-11-09 Dunlop Rubber Co Improvements in or relating to pneumatic tyres
US3302681A (en) * 1964-05-19 1967-02-07 Michelin & Cie Tire covers
US3318357A (en) * 1965-04-23 1967-05-09 Gen Tire & Rubber Co Pneumatic tire
US3547178A (en) * 1966-10-13 1970-12-15 Gen Etablissements Michelin Ra Pneumatic tires and adaptable rims therefor
US3606921A (en) * 1969-06-23 1971-09-21 Caterpillar Tractor Co Belted oval pneumatic tube-tire
US3976116A (en) * 1973-10-01 1976-08-24 Caterpillar Tractor Co. Rim constructions
US4043370A (en) * 1976-01-26 1977-08-23 Caterpillar Tractor Co. Seal arrangement for an oval tire and rim

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2010767A (en) * 1933-05-22 1935-08-06 Gen Tire & Rubber Co Method of making pneumatic tires
US4072550A (en) * 1975-06-16 1978-02-07 The Goodyear Tire & Rubber Company Method and apparatus for building a closed torus tire

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915102A (en) * 1955-07-11 1959-12-01 Ind Ovens Inc Pneumatic tire
GB1047921A (en) * 1963-01-31 1966-11-09 Dunlop Rubber Co Improvements in or relating to pneumatic tyres
US3302681A (en) * 1964-05-19 1967-02-07 Michelin & Cie Tire covers
US3318357A (en) * 1965-04-23 1967-05-09 Gen Tire & Rubber Co Pneumatic tire
US3547178A (en) * 1966-10-13 1970-12-15 Gen Etablissements Michelin Ra Pneumatic tires and adaptable rims therefor
US3606921A (en) * 1969-06-23 1971-09-21 Caterpillar Tractor Co Belted oval pneumatic tube-tire
US3976116A (en) * 1973-10-01 1976-08-24 Caterpillar Tractor Co. Rim constructions
US4043370A (en) * 1976-01-26 1977-08-23 Caterpillar Tractor Co. Seal arrangement for an oval tire and rim

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727653A1 (fr) * 1994-12-05 1996-06-07 Michelin & Cie Profil meridien du retournement d'une carcasse radiale de pneumatique
WO1996017734A1 (fr) * 1994-12-05 1996-06-13 Compagnie Générale des Etablissements MICHELIN-MICHELIN & Cie Pneumatique a armature de carcasse radiale
US5849117A (en) * 1994-12-05 1998-12-15 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tire with radial carcass reinforcement having specified turn-up
WO2001036219A1 (fr) * 1999-11-18 2001-05-25 Société de Technologie Michelin Pneumatique avec zone basse comportant une concentration de fils
US6973950B2 (en) 1999-11-18 2005-12-13 Michelin Recherche Et Technique S.A. Tire with low zone comprising a concentration of cords
US7406992B2 (en) 1999-11-18 2008-08-05 Michelin Recherche Et Technique S.A. Tire with low zone comprising a concentration of cords
US8037912B2 (en) 1999-11-18 2011-10-18 Michelin Recherche Et Technique S.A. Tire with low zone comprising a concentration of cords

Also Published As

Publication number Publication date
BE893166A (fr) 1982-08-30
IT1152226B (it) 1986-12-31
AU7412981A (en) 1982-12-07
EP0080459A4 (fr) 1983-10-06
IT8221586A0 (it) 1982-05-31
JPS58500849A (ja) 1983-05-26
EP0080459A1 (fr) 1983-06-08

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