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 PDFInfo
- 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
Links
- 238000005096 rolling process Methods 0.000 title abstract description 13
- 230000003247 decreasing effect Effects 0.000 title abstract description 6
- 238000010276 construction Methods 0.000 title description 4
- 238000005728 strengthening Methods 0.000 claims abstract description 28
- 230000000452 restraining effect Effects 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 7
- 239000011324 bead Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
PCT/US1981/000759 WO1982004225A1 (fr) | 1981-06-08 | 1981-06-08 | Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement |
AU74129/81A AU7412981A (en) | 1981-06-08 | 1981-06-08 | Improvement in tire construction for decreasing rolling resistance |
EP19810901862 EP0080459A4 (fr) | 1981-06-08 | 1981-06-08 | Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement. |
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 |
---|---|---|---|
WOUS81/00759810608 | 1981-06-08 | ||
PCT/US1981/000759 WO1982004225A1 (fr) | 1981-06-08 | 1981-06-08 | Ameliorations dans la construction de pneus permettant de diminuer la resistance au roulement |
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)
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)
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)
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 |
-
1981
- 1981-06-08 EP EP19810901862 patent/EP0080459A4/fr not_active Withdrawn
- 1981-06-08 JP JP50229581A patent/JPS58500849A/ja active Pending
- 1981-06-08 WO PCT/US1981/000759 patent/WO1982004225A1/fr not_active Application Discontinuation
- 1981-06-08 AU AU74129/81A patent/AU7412981A/en not_active Abandoned
-
1982
- 1982-05-13 BE BE0/208078A patent/BE893166A/fr unknown
- 1982-05-31 IT IT21586/82A patent/IT1152226B/it active
Patent Citations (8)
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)
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 |
---|---|
EP0080459A1 (fr) | 1983-06-08 |
IT8221586A0 (it) | 1982-05-31 |
IT1152226B (it) | 1986-12-31 |
AU7412981A (en) | 1982-12-07 |
BE893166A (fr) | 1982-08-30 |
JPS58500849A (ja) | 1983-05-26 |
EP0080459A4 (fr) | 1983-10-06 |
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