AU592132B2 - A wheel for all-terrain vehicles - Google Patents
A wheel for all-terrain vehicles Download PDFInfo
- Publication number
- AU592132B2 AU592132B2 AU65805/86A AU6580586A AU592132B2 AU 592132 B2 AU592132 B2 AU 592132B2 AU 65805/86 A AU65805/86 A AU 65805/86A AU 6580586 A AU6580586 A AU 6580586A AU 592132 B2 AU592132 B2 AU 592132B2
- Authority
- AU
- Australia
- Prior art keywords
- bead
- rim
- tyre
- assembly according
- toe
- 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.)
- Ceased
Links
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- Tires In General (AREA)
Description
FORM 10 5921312* A SPRUSON FERGUSON COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION
(ORIGINAL)
FOR OFFICE USE: Class 6os7 Int. Class Complete Specification Lodged: Accepted: Published: ~~'Vorfl.
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fi Name of Applicant: Address of Applicant: Actual Inventor(s): Address for Service: SUMITOMO RUBBER INDUSTRIES, LTD.
1-1, Tsutsuicho 1-chome, Chuo-ku, Kobe-shi, Hyogo-ken, Japan EIJI NAKASAKI and YASUO IGARASHI Spruson Ferguson, Patent Attorneys, Level 33 St Martins Tower, 31 Market Street, Sydney, New South Wales, 2000, Australia Complete Specification for the invention entitled: 1 t "A WHEEL FOR \CS Th, following statement is a full description of this invention, ikluding the best method of performing it known to us r v, i
I
.~Pcnm~a~ I s TITLE OF THE INVENTION A Wheel for T-u-o_ e_ lO o o o o oo o 0 0 0 o o o00 0 0 0 0 0 6 0 BACKGROUND OF THE INVENTION This invention relates to a wheel comprising a run-flat tyre and a rim for All-Terrain Vehicles (ATV), wherein the tyre is safely prevented from slipping out from the rim, even if the air is released by puncture or the like during the running, and which is able to run with deflated tyre.
In the conventional wheel for ATV, the tyre is fastened on the rim by the internal air pressure of the tyre which presses the bead base and outer surface of the bead portion of the tyre on the bead seat and rim flange of the rim, respectively.
Consequently, when the pressure is decreased, the retention force between the tyre and rim is inevitably lowered. In particular, when the pressure is suddenly decreased by the puncture or the like, the bead portion is slipped out of the bead seat by the lowered retention force and an additional lateral force owing to the handle operation, which imperil the th safety.
Furthermore, the normal air pressure of the tyre for ATV is low, so that the slipping-out of the bead portion from the bead seat is occurred by a lateral force owing to an eventual sharp cornerring to avoid a possible accident.
The above mentioned slipping-out leads to not only lak of the maneuver stability but also dangerous situation that the tyre is dropped off from the rim, particularly which has a rim well.
Such a lateral force acts on the tread is transferred to the bead portion through the carcass, and lifts the heel of the bead portion. As a result, a frictional force between the bead base r ct t it a 0; C Co *r IC
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rot and bead seat, only one force to hold the bead base on the bead seat will remarkably decrease, which will lead the bead portion to fall into the rim well.
SUMMARY OF THE INVENTION It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.
There is disclosed herein a tire and wheel rim assembly for All-Terrain Vehicles comprising a wheel rim and a run-flat tire mounted thereon, said tire comprising a bead core disposed in each bead portion of the tire; a bead apex disposed in each bead port~ion and extending radially outwardly from the bead core; a toroidal carcass having at least one ply of cords extending between the bead portions and turned up around the bead cores; and a toe strip disposed axially inward of each bead core to form a radially inwardly protruding bead toe, said wheel rim comprising: a pair of bead seats for supporting the bead portions of the tire; a rim well disposed therebetween for tire assembly; and a circumferentially extending groove provided in an axially inner portion of each bead seat to receive the bead toe of the tire, wherein the radially outward height of the radially outermost end of the bead apex from the bead base is in a range of to 30% of the tire section height, the thickness of a sidewall rubber layer disposed on the carcass from the bead portion to a buttress portion, is at least 10 times the thickness of the carcass ply cords, and said wheel rim is provided adjacently to the axially inward end of each bead seat with at least one radially outward protrusion having a flat top of which diameter is not smaller than the diameter of the wheel rim.
BRIEF DESCRIPTION OF THE DRAWINGS A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings, wherein: Fig. 1 is a sectional view showing one embodiment of the tyre according to the present invention; Fig. 2 is a sectional view showing one embodiment of the rim according to the present Invention; Fig. 2(A) is a detailed partial view thereof; Fig. 3 is a sectional view showing a conventional tyre; and Fg. 4 is a sectional view showing a conventional rim for the tyre shown in Fig. 3.
DETAILED DESCRIPTION OF THE INVENTION This Invention Is directed to a wheel for All-Terrain Vehicles Sctpr tsing a run-flat tyre 1 and a rim 2, tLH//3505F 2 I ,t r c 1 .a.
I I tito t tr o ato o t cl"" ;yiH,4 the tyre 1 comprising: a pair of substantially inextensible bead cores being disposed in the bead portions 9 of the tyre 1; a toroidal carcass 4 of a radial or bias construction, with both ends thereof being folded back around the bead cores 3; a pair of sidewalls SW, extending from the buttress portion BT to bead 8 l.
9 Ca al a C 0 a U /3505F -2 2a pp 11 i Ij Ir C 4 I tt 4 Ic Ct t t
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FI 1 4t 4f 1 4 portion 9 of the tyre 1, and comprising a sidewall rubber layer having thickness of at least 10 times of the diameter of the carcass ply cord and a bead apex BE with the radially outward height h2 of the radially outermost end thereof from the bead base being within the range of 15% to 30% of the tyre section height hl; and a toe strip 7, being axially inwardly of the bead core 3, and protruding radially inwardly from the bead portion 9, the rim 2 comprising: a rim well 11 for tyre assembly; and a bead seats 12 for supporting the bead portions 9 of the tyre 1, each provided at the axially inner portion thereof with at least one ciruumferentially extending groove 15 for fitting the toe st:ip 7.
Now, a preferred embodiment of this invention will be described in detail with reference to the accompanying drawings.
In Fig. 1, the tyre 1 comprises: a pair of bead cores 3; the toroidal carcass 4 extending from the bead portion 9 to bead portion 9, both ends of which folded back around the bead cores 3 to secure the carcass 4; a tread 5 disposed along the periphery of the crown portion of the carcass 4; a belt layer 6 disposed between the tread 5 and carcass 4; and the bead portions 9 each provided with the toe strip 7.
In this embodiment, the carcass 4 is of a radial construction in which at least one rubberized parallel cord ply is arranged so that the carcass ply cords are laid at an angle of 700 to 900 with respect to the equatorial line of the tyre. The carcass ply cords are made of the organic fiber cords such as Nylon, Polyester, Rayon and/or Aromatic polyamide. The carcass can also employ a bias construction in which at least two rubberized parallel cord plies are arranged so that the carcass ply cords i iI 1 ii within each ply intersects with each other.
The belt layer 6 is composed of rubberized cords laid at an angle of 100 to 300 with respect to the equatorial line of the tyre. The cord thereof is made of inextensible material such as steel. The belt layer 6 is preferably arranged all over the width of the tread. The arrangement of the belt layer 6 leads to a increasing in the rigidity of the ground contacting surface of the tyre, accordingly, a stability in straight running and a resistance to puncture are improved.
The toe strip 7 extends circumferentially of the tyre alon, the axially inner portion, in this embodiment, axially innermost end of the bead base of the bead portion 9, so that the one protrudes radially inwardly therefrom at the axially inside of the bead core 3.
Furthermore, the toe strip 7 is made of rubber compound or
S°
elastomer having JIS A hardness of 800 to6°, and further, the toe strip 7 is preferably reinforced by a fiber cord reinforcing layer 8 disposed from the inside to outside of the bead portion 9 along the profile of the very toe strip 7 as shown in Fig. 1.
Still furthermore, the toe strip 7 can employ the one made of elastomer only, or the one having a core being harder than the surrounding elastomer and made of hard rubber compound, plastic, fibers or the like. In case of the toe strip with a core being employed, the engagement of the tyre with the rim can be more strengthened.
The sidewall SW extending from the buttress portion BT to the bead portion 9, comprises a sidewall rubber layer and a bead apex BE.
The sidewall rubber layer extends from buttress portion BT C C C
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C *0 C 0 a ft C a a 4a to the clincher portion FR contacting with the rim flange 13 of rim 2. The thickness E, F) of the layer is at least 10 times of the diameter of the carcass ply cord, whereby a certain vertical stiffness of the sidewall SW is maintained even if the internal air is released. When it is less than 10 times, it is impossible to get a enough vertical stiffness to run even under deflation. The elastic modulus of the sidewall rubber layer at 100% elongation is preferably more than 12 kg/cm 2 The bead apex BE extends radially outwardly from the bead core 3, and the radially outward height h2 of the radially outermost end thereof is within the range of 15% to 30%, more preferably 20% to 25% of the tyre section height hl. When it is less than 15%, there is decreased the lateral stiffness of the sidewall radially outward of the rim flange, and the bead portion of the deflated tyre will fatigue remarkably. On the contrary, when it is more than 30%, a stress concentration is apt to occur at the above mentioned outermost end, which leads to a crack.
The bead apex BE is preferably made of rubber compound having JIS A hardness of 800 to 950.
The above mentioned rim 2, as shown in Fig. 2, comprises: a rim-well 11 indented in the central portion thereof; a pair of bead seats 12, each axially inward end of which is connected with each end of the rim well 11; and a pair of rim flanges 13 each protruding radially outwardly from the axially outward end of each bead seat 12.
The bead seat 12 is provided at the axially inner portion thereof with one circumferentially extending groove 15, and the groove 15 fits the toe strip 7.
Furthermore, the rim 2 is provided adjacently to the axially 0*0*85 a 0*0 a a C 4 a* a I :11:
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i0 V (V 4 It 4 C 4 44 44 4 4444 4 44 4 4 4 4 4 it 4 Ci inward end of the bead seat 12 with one radially outwardly protruding protrusion H. The radially outer end of the protrusion H is formed flat and the diameter thereof is, in this example, equal to the diameter D of the rim 2.
The bead seat 12 forms a declinity inclined smoothly continuously radially inwardly from the axially outward end thereof to the bottom of the groove 15, and a steep acclivity inclined outwardly from the bottom of the groove 15 to the axially inward end thereof.
In addition, the width WS of the bead seat 12 must be almost equal to the width WB of the bead base of the bead portion 9. In this example, the width WS is a distance between the rim flange 13 and the protrusion H. The dir.meter of the radially outer end of the protrusion H is equal to or larger than the diameter D of the rim 2. The radially inward height of the radially innermost end of the toe strip 7 from the bead base is within the range of 3% to 6% of the tyre section height hl. The width WT of the toe strip 7 is within the range of 25% to 50% of the width WB of the bead base. Furthermore, any shape can be employed for the protrusion H and toe strip 7 as far as they can fit with each other and prevent the slipping-out of the bead portion from the bead seat.
The tyre 1 can be mounted on the rim 2 by a conventional way, that is, by the steps of setting the bead portions 9 onto the rim well 11 over the rim flanges 13 and applying air through the valve. Accordingly, the air pressure presses the bead portion 9 on the bead seat 12 and rim flange 13 over the protrusions H, and toe strip 7 is pushed into the groove whereby the tyre 1 is firmly held on the rim 2.
On a wheel A according to the present invention and a conventional wheel B with the specifications set out in Table 1, there were conducted various kinds of comparative tests fok, the resistance to slipping-out (a force for making the bead portion slip out from the bead seat), the ability to run flat (a runable distance under a deflation of air pressure 0 kg/cm 2 the plunger resistance (a resistance to puncture), and the rolling resistance. The test results are shown in Table 2, wherein each value is expressed by an index on the assumption that the conventional wheel B is 100, nnd the larger the value the better the property.
Table 3 shows more detailed specifications for one embodiment of the present invention.
As described above, the wheel according to the present invention comprises: a run-flat tyre of which the bead portions S are provided with toe strips protruding radially inwardly 4 4 T C therefrom; and a rim of which the bead seats are provided with 4 t grooves for fitting the toe strips. Accordingly, the unifying SJ force between the tyre and rim will be increased, and there is no possibility of the tyre slipping out from the rim owing to a quick handling under low air pressure, and further, the ability to run-flat under the deflation state with no air pressure is a It improved by the stiffness of the reinforced sidewalls of the tyre.
7
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r TABLE 1 A (Invention) B (Convention) Tyre: Sectional shape Fig. 1 Fig. 3 Size 600X300R9.5 25X12.00-9 Sectional height hi 180 mm 186 mm Sidewall rubber layer: Thickness C mm 7.0 E mm 7.0 i( F mm 9.0 Elastic modulus kg/cm 15 12 Bead apex: Height h2 mm 40 Hardness 85 Belt layer: Cord angle 15 Cord material steel/2cut Carcass: Cord 1000d/2 Polyester Cord angle 90 (Radial) 45 (Bias) oa Toe strip: e 0 Height h3 mm 7.2 o Width WT mm 8 00 Bead portion: S" Width WB mm 18 o 0 C Go
CCC,
CCa O CC 00 C C CC
C
C
C CL C lr Rim: Sectional shape Fig.2 Fig.4 Size 230X9.5 9.25X9 Material 5154 Thickness mm 3.5 Dimension Table 3 Plung Res is Roll1 res is i Ab ili ICRun f TABLE 2 A (Invention) B (Convention) Test conditions :er 280 100 pressure: 0.15 kg/ cm 2 tance plunger dia.: 8 mm ~tance to 200 100 pressure: 0.15 kg/ cm 2 ing-out lubricant: water *ng 54 100 pressure: 0.15 kg/cm 2 tance speed: 80 km/h load: 80 kg ity to over 100 km 'lat (40 km/h) TABLE 3 0 00 0 0 a 0.4 q I t0 D 240. 0 +-0.4 RW 230 +-1.5 WE 25.0 +2 -0 A 28.0 B 15. 0 P 18. 0 +0.5 -0 TR4 5 r TR5 5 r TR6 9 r TR7 6 r TR8 10 r 0 9 20 0 TRI 410 r TR2 ,3.5 r TR3 3 r j3 6 E 2 12 E 3 6 C C~ I 4 0 [4
Claims (6)
- 2. The assembly according to claim 1 wherein the diameter of the top of the protrusion Is larger than thi diameter of the wheel rim.
- 3. The assembly according to claim I wherein the toe strip is made 11of a rubber compound having JIS A hardness of 80 to
- 4. The assembly according to claim 1 wherein the bead toe is reinforced by a reinforcing layer disposed from the inside to outside of the bead portion along the profile thereof. The assembly according to claim 1 wherein the radially inward height of the tip of the bead toe from the bead base is in a range of 3% to A of the tire section height.
- 6. The assembly according to claim 1 wherein the width of the bead toe is in a range of 25% to 50% of the width of the bead base.
- 7. The assembly according to claim 1 wherein the bead seat is provided with a declivity with smooth transition from the axially outer end of the bead seat to the bottom of the groove. TI.H/3505F -1 10
- 8. A tire and wheel rim assembly, substantially as hereintlfore described with reference to the accompanying drawings. DATED this SIXTH day of OCTOBER 1989 Sumitomo Rubber Industries Ltd Patent Attorneys for the Applicant SPRUSON FERGUSON 0 4 I 4i 4 4 a4 t
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60-269920 | 1985-11-30 | ||
| JP60269920A JPS62128807A (en) | 1985-11-30 | 1985-11-30 | Builtup body of run-flat tire for atv and rim |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6580586A AU6580586A (en) | 1987-06-04 |
| AU592132B2 true AU592132B2 (en) | 1990-01-04 |
Family
ID=17479055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU65805/86A Ceased AU592132B2 (en) | 1985-11-30 | 1986-11-28 | A wheel for all-terrain vehicles |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS62128807A (en) |
| AU (1) | AU592132B2 (en) |
| ZA (1) | ZA868967B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5186772A (en) * | 1985-11-30 | 1993-02-16 | Sumitomo Rubber Industries, Ltd. | Run-flat tire and rim assemblies for ATV |
| US4760017A (en) * | 1985-12-23 | 1988-07-26 | E. I. Du Pont De Nemours And Company | Arabinonucleic acid probes for DNA/RNA assays |
| JPH01145208A (en) * | 1987-11-30 | 1989-06-07 | Sumitomo Rubber Ind Ltd | Assembly body of run flat tire for atv and rim |
| JP5681216B2 (en) * | 2011-02-04 | 2015-03-04 | 株式会社ブリヂストン | Pneumatic tire rim |
| CN111284279A (en) * | 2018-12-10 | 2020-06-16 | 通伊欧轮胎株式会社 | Pneumatic tire |
| CN111731044A (en) * | 2020-07-27 | 2020-10-02 | 安徽佳通乘用子午线轮胎有限公司 | Run-flat tire with excellent performance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU524187B2 (en) * | 1977-12-23 | 1982-09-02 | Dunlop Limited | Tyre tread with air relief means |
| AU525383B2 (en) * | 1978-07-29 | 1982-11-04 | Dunlop Limited | Tyre and wheel rim assembly |
| AU559007B2 (en) * | 1982-04-21 | 1987-02-19 | Btr Industries Limited | Pneumatic tire and wheel rim assemblies |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547082A (en) * | 1977-06-17 | 1979-01-19 | Mitsubishi Electric Corp | System to manage going over the speed limit |
| JPS5477902A (en) * | 1977-12-01 | 1979-06-21 | Sumitomo Rubber Ind | Tire |
| JPS5559005A (en) * | 1978-10-30 | 1980-05-02 | Bridgestone Corp | Air-filled safety tire |
| JPS55152609A (en) * | 1979-05-16 | 1980-11-28 | Sumitomo Rubber Ind Ltd | Low pressure tire |
| DE3024983C2 (en) * | 1980-07-02 | 1989-08-10 | Webasto-Werk W. Baier GmbH & Co, 8035 Gauting | Method and circuit arrangement for determining an amount of preheating energy |
-
1985
- 1985-11-30 JP JP60269920A patent/JPS62128807A/en active Pending
-
1986
- 1986-11-26 ZA ZA868967A patent/ZA868967B/en unknown
- 1986-11-28 AU AU65805/86A patent/AU592132B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU524187B2 (en) * | 1977-12-23 | 1982-09-02 | Dunlop Limited | Tyre tread with air relief means |
| AU525383B2 (en) * | 1978-07-29 | 1982-11-04 | Dunlop Limited | Tyre and wheel rim assembly |
| AU559007B2 (en) * | 1982-04-21 | 1987-02-19 | Btr Industries Limited | Pneumatic tire and wheel rim assemblies |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA868967B (en) | 1987-07-29 |
| AU6580586A (en) | 1987-06-04 |
| JPS62128807A (en) | 1987-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |