CA1086619A - High load bearing capacity pneumatic tire - Google Patents
High load bearing capacity pneumatic tireInfo
- Publication number
- CA1086619A CA1086619A CA300,660A CA300660A CA1086619A CA 1086619 A CA1086619 A CA 1086619A CA 300660 A CA300660 A CA 300660A CA 1086619 A CA1086619 A CA 1086619A
- Authority
- CA
- Canada
- Prior art keywords
- ply
- tire
- radially internal
- internal plies
- plies
- 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.)
- Expired
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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
-
- 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
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2009—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords comprising plies of different materials
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
HIGH LOAD BEARING CAPACITY PNEUMATIC TIRE
ABSTRACT
The heavy duty, high load capacity tire has a reinforcement belt that includes two to four unfolded plies made of steel and/or Aramide cord and a fettering ply, made of 5° to 15° steel cord, arranged in the central portion of the reinforcement belt radially outward of the two to four unfolded plies. The fettering ply clamps the unfolded plies in the area of the tread center firmly onto the crown area of the carcass to maintain a low radius of curvature in the crown area of the carcass in a non-inflated condition, or under normal inflation pressures.
ABSTRACT
The heavy duty, high load capacity tire has a reinforcement belt that includes two to four unfolded plies made of steel and/or Aramide cord and a fettering ply, made of 5° to 15° steel cord, arranged in the central portion of the reinforcement belt radially outward of the two to four unfolded plies. The fettering ply clamps the unfolded plies in the area of the tread center firmly onto the crown area of the carcass to maintain a low radius of curvature in the crown area of the carcass in a non-inflated condition, or under normal inflation pressures.
Description
10866~
This invention relates to pneumatic tires and more particularly to a heavy duty, high-load capacity pneumatic tire for trucks or other large size vehicles.
O~e known high load capacity tire as shown in U. S.
Patent 3,757,844 (Corresponding to DOS 2,162,847) employs a reinforcement comprising a folded belt ply having a cord angle of 15 enclosing an unfolded belt ply having a cord angle of 22 . Another unfolded belt ply having a cord angle of 18 is disposed between the folded free ends of the lo 15 ply, all plies being made of steel cord. This reinforce-ment is particularly stiff at the belt edges and at the shoulder areas.
rires such as shown in U. S. Patent 3,757,844 when mounted to a heavy vehicle, can usually be operated with-out damage for an extended period of time at a speed of 120-130 kilometers per hour (75 to 81.25 miles per hour).
However, the tire carcass undergoes considerable deflection between the sidewall areas of maximum width. Consequently there is a relatively low radial elevation of the tire tread above the rim, usually lower than that of a standard pneumatic tire for heavy vehicles which often results in pronounced wear of the tire in the shoulder area.
In large, heavy duty, high load bearing capacity pneumatic tires it is desirable to keep the tire cross-section flat not only during its manufacture but also when it is inflated to normal operating pressure.
It is known in the art to impart a pre-selected profile to a radial carcass to enable it to adapt to the flat profile o~ a reinforcement belt that is incorporated therein. However the principal ob~ect of this invention is to obtain a flat cross-section in a standard radial carcass solely as a result of the reinforcement belt design, thereby simplifying tire manufacture and also providing improved wear characteristics particularly in the shoulder area of the tire. Other ob~ects and features will be in part apparent and in part pointed out hereinafter.
In accordance with the invention a radial tire is provided with a belt like reinforcement that includes two to four unfolded plies made of steel cord and/or Aramide cord and a "fettering" ply externally spanning parts of at least one of the other plies and having 5 to 15 steel cords. Preferably the steel cord fettering ply is arranged in the central portion of the reinforcing belt and, pre-ferably all other plies are situated radially within the steel cord fettering ply. Under this arrangement the fettering ply clamps the unfolded plies in the area of the tread center firmly onto the crown area of the carcass.
The accompanying drawing shows a fragmentary cross-section of a pneumatic tire incorporating one embodiment o~
my invention.
Referring now to the drawing the pneumatic tire is generally indicated by reference number 1 and a central circumferential plane of the tire 1 is indicated by the reference letter A. The intersection between the central circumferential plane A and the tire tread defines a central circumferential line of the tread.
The tire 1 includes a radial carcass 2 preferably made of steel cords. Although the carcass 2 is shown to be of single ply construction it is also feasible to use a carcass having more than one ply. The carcass 2, in its sidewall areas, is covered by sidewall rubber plies 3 extend-16)~66~9 ing bilaterally into the shoulder areas 6 and 7 of a tread 5. The inner area of the tire is designated by the reference number 4.
A belt like reinforcement 8 is disposed between the tread 5 and the crown area of the carcass 2 and bears upon the carcass 2 along both sides of the central cir-cumferential plane A.
A pair of adhesive rubber cushions 11 and 12 are -- arranged beneath the marginal areas of the belt like rein-forcement 8.
The belt like reinforcement 8 comprises two to four unfolded plies of steel or Aramide cord layered one upon the other such as the plies 13, 14 and 15. The cord elements in the plies 13, 14 and 15 make an angle between 16 and 32, preferably between 18 and 24 with the circumferential center line of the tread. However the cord elements in sequential plies intersect with one another.
It should be noted that the plies 13, 14 and 15 can all be formed with either steel cord or Aramide cord, or sequential plies can be formed of alternate stated materials.
A fettering ply 16 made of steel cord is layered directly onto the ply 15 and covers the central area of the plies 13, 14 and 15. The ply 16 thus clamps the central area of the plies 13, 14 and 15 to the carcass 2, the fettering effect being achieved by arranging the cord elements in the ply 16 at a bias angle of approximately 5 to 15 with the circumferential center line of the tread.
A clamping in of the central area of all the plies 13, 14 and 15 is preferred and it is not necessary that the fettering ply extend the full width of the plies 13, 14 and 15. As shown in the drawing, the plies 13, 14 and 15 can be of different axial width and the ply width in a radlal direction need not be equivalent. If desired, more than three of the plies such as 13, 14 and 15 can be used.
It has been found that upon vulcanization of the disclosed tire construction and also upon inflating the tire to normal operating pressure the crown area of the carcass has a low radius of curvature and retains a generally flat cross-sectional shape. The flatness extends to a larger area of the unfolded belt plies and carcass cro~Jn than is encompassed by the fettering ply.
me fettering ply thus permits a firm and durable application of the unfolded belt plies to the crown area of the carcass.
Thus the provision of the steel cord fettering ply enables large size and high load bearing capacity pneumatic tires to be maintained cross-sectionally flat in a simple efficient manner. Since the shoulder cross-section is substantially smaller than corresponding shoulder areas of conventional pneumatic tires for trucks it generates less interior heat during operation resulting in reduced wear of the shoulder.
In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results obtained.
As various changes could be made in the above con-struction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.
This invention relates to pneumatic tires and more particularly to a heavy duty, high-load capacity pneumatic tire for trucks or other large size vehicles.
O~e known high load capacity tire as shown in U. S.
Patent 3,757,844 (Corresponding to DOS 2,162,847) employs a reinforcement comprising a folded belt ply having a cord angle of 15 enclosing an unfolded belt ply having a cord angle of 22 . Another unfolded belt ply having a cord angle of 18 is disposed between the folded free ends of the lo 15 ply, all plies being made of steel cord. This reinforce-ment is particularly stiff at the belt edges and at the shoulder areas.
rires such as shown in U. S. Patent 3,757,844 when mounted to a heavy vehicle, can usually be operated with-out damage for an extended period of time at a speed of 120-130 kilometers per hour (75 to 81.25 miles per hour).
However, the tire carcass undergoes considerable deflection between the sidewall areas of maximum width. Consequently there is a relatively low radial elevation of the tire tread above the rim, usually lower than that of a standard pneumatic tire for heavy vehicles which often results in pronounced wear of the tire in the shoulder area.
In large, heavy duty, high load bearing capacity pneumatic tires it is desirable to keep the tire cross-section flat not only during its manufacture but also when it is inflated to normal operating pressure.
It is known in the art to impart a pre-selected profile to a radial carcass to enable it to adapt to the flat profile o~ a reinforcement belt that is incorporated therein. However the principal ob~ect of this invention is to obtain a flat cross-section in a standard radial carcass solely as a result of the reinforcement belt design, thereby simplifying tire manufacture and also providing improved wear characteristics particularly in the shoulder area of the tire. Other ob~ects and features will be in part apparent and in part pointed out hereinafter.
In accordance with the invention a radial tire is provided with a belt like reinforcement that includes two to four unfolded plies made of steel cord and/or Aramide cord and a "fettering" ply externally spanning parts of at least one of the other plies and having 5 to 15 steel cords. Preferably the steel cord fettering ply is arranged in the central portion of the reinforcing belt and, pre-ferably all other plies are situated radially within the steel cord fettering ply. Under this arrangement the fettering ply clamps the unfolded plies in the area of the tread center firmly onto the crown area of the carcass.
The accompanying drawing shows a fragmentary cross-section of a pneumatic tire incorporating one embodiment o~
my invention.
Referring now to the drawing the pneumatic tire is generally indicated by reference number 1 and a central circumferential plane of the tire 1 is indicated by the reference letter A. The intersection between the central circumferential plane A and the tire tread defines a central circumferential line of the tread.
The tire 1 includes a radial carcass 2 preferably made of steel cords. Although the carcass 2 is shown to be of single ply construction it is also feasible to use a carcass having more than one ply. The carcass 2, in its sidewall areas, is covered by sidewall rubber plies 3 extend-16)~66~9 ing bilaterally into the shoulder areas 6 and 7 of a tread 5. The inner area of the tire is designated by the reference number 4.
A belt like reinforcement 8 is disposed between the tread 5 and the crown area of the carcass 2 and bears upon the carcass 2 along both sides of the central cir-cumferential plane A.
A pair of adhesive rubber cushions 11 and 12 are -- arranged beneath the marginal areas of the belt like rein-forcement 8.
The belt like reinforcement 8 comprises two to four unfolded plies of steel or Aramide cord layered one upon the other such as the plies 13, 14 and 15. The cord elements in the plies 13, 14 and 15 make an angle between 16 and 32, preferably between 18 and 24 with the circumferential center line of the tread. However the cord elements in sequential plies intersect with one another.
It should be noted that the plies 13, 14 and 15 can all be formed with either steel cord or Aramide cord, or sequential plies can be formed of alternate stated materials.
A fettering ply 16 made of steel cord is layered directly onto the ply 15 and covers the central area of the plies 13, 14 and 15. The ply 16 thus clamps the central area of the plies 13, 14 and 15 to the carcass 2, the fettering effect being achieved by arranging the cord elements in the ply 16 at a bias angle of approximately 5 to 15 with the circumferential center line of the tread.
A clamping in of the central area of all the plies 13, 14 and 15 is preferred and it is not necessary that the fettering ply extend the full width of the plies 13, 14 and 15. As shown in the drawing, the plies 13, 14 and 15 can be of different axial width and the ply width in a radlal direction need not be equivalent. If desired, more than three of the plies such as 13, 14 and 15 can be used.
It has been found that upon vulcanization of the disclosed tire construction and also upon inflating the tire to normal operating pressure the crown area of the carcass has a low radius of curvature and retains a generally flat cross-sectional shape. The flatness extends to a larger area of the unfolded belt plies and carcass cro~Jn than is encompassed by the fettering ply.
me fettering ply thus permits a firm and durable application of the unfolded belt plies to the crown area of the carcass.
Thus the provision of the steel cord fettering ply enables large size and high load bearing capacity pneumatic tires to be maintained cross-sectionally flat in a simple efficient manner. Since the shoulder cross-section is substantially smaller than corresponding shoulder areas of conventional pneumatic tires for trucks it generates less interior heat during operation resulting in reduced wear of the shoulder.
In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results obtained.
As various changes could be made in the above con-struction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.
Claims (10)
1. A heavy duty, high load bearing capacity pneumatic tire comprising, in cross-section, a tread, a radial carcass having at least one ply formed of steel cords, and a multi-ply belt-like reinforcement disposed between the tread and the carcass, said reinforcement including a plurality of un-folded radially internal plies on the crown area of the car-cass, and an unfolded radially external fettering ply formed with steel cords and being of lesser cross-wise extent than the radially internal plies for firmly clamping the radially internal plies to the crown area of the carcass, the radially internal plies having cords making a bias angle in the range of 16° to 32°, with respect to a circumferential center-line of tread and being arranged to intersect at each sequen-tial ply and wherein the bias angle of the fettering ply with respect to the circumferential center line of the tread is in the range of 5° to 15°, to maintain the crown area of the carcass in a substantially flat shape in an uninflated condi-tion and when the tire is inflated to normal operating pres-sures, and wherein the cords in the radially outermost ply of said radially internal plies, and the cords in said fet-tering ply are inclined such that their respective inter-sections with the origin of a pair of coordinate axes, wherein one of said axes correspond to the circumferential center line of the tread, are capable of forming respective angles lying in one quadrant of said coordinate axes.
2. A tire as claimed in claim 1 wherein the radially internal plies comprise steel cords.
3. A tire as claimed in claim 1 wherein the radially internal plies comprise Aramide cords.
4. A tire as claimed in claim 1 wherein there are three radially internal plies.
5. A tire as claimed in claim 4 wherein the radially internal plies are of different cross-wise extent.
6. A tire as claimed in claim 5 wherein the middle ply of the three radially internal plies is of greater cross-wise extent than the other radially internal plies.
7. A tire as claimed in claim 6 wherein the outer-most ply of the three radially internal plies is of shorter cross-wise extent than the innermost ply of the three radially internal plies.
8. A tire as claimed in claim 1 wherein the bias angle of the radially internal plies is in the range of 18°
to 24°.
to 24°.
9. A tire as claimed in claim 1 wherein the tire has sidewalls joined to opposite end portions of the tread and a pair of adhesive rubber cushions are arranged at the end portions of the tread beneath the marginal areas of the rein-forcing belt.
10. A tire as claimed in claim 6 wherein the middle ply of the three radially internal plies has a cord angle such that the cord is inclined in another quadrant upon inter-secting at the origin of the coordinate axes with the fettering ply and the radially outermost ply of the radially internal plies.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7713981U DE7713981U1 (en) | 1977-05-03 | 1977-05-03 | HEAVY-DUTY BELT TIRE, ESPECIALLY FOR TRUCKS, HEAVY AND / OR LARGE VEHICLES, WITH A MINIMUM SINGLE-LAYER RADIAL CARCASS, PREFERABLY MADE OF STEEL, AND A MULTI-LAYER OF GUARDS TYPE ON STAINLESS STEEL |
| DEG7713981.2 | 1977-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1086619A true CA1086619A (en) | 1980-09-30 |
Family
ID=6678429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA300,660A Expired CA1086619A (en) | 1977-05-03 | 1978-04-07 | High load bearing capacity pneumatic tire |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS53136207A (en) |
| AU (1) | AU516618B2 (en) |
| BE (1) | BE866679A (en) |
| CA (1) | CA1086619A (en) |
| DE (1) | DE7713981U1 (en) |
| FR (1) | FR2389503B1 (en) |
| GB (1) | GB1603058A (en) |
| IT (2) | IT7868011A0 (en) |
| SE (1) | SE7805046L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2828241A1 (en) * | 1978-06-28 | 1980-01-03 | Uniroyal Gmbh | HIGH-STRENGTH STEEL CORD BELT WITH ADHESIVE RUBBER MIX IN THE TIRE BULB |
| FR2536018B1 (en) * | 1982-11-16 | 1986-09-12 | Uniroyal Englebert Gmbh | VEHICLE TIRE, WITH BELT COMPRISING AT LEAST TWO LAYERS |
| US4454903A (en) * | 1983-05-12 | 1984-06-19 | The Goodyear Tire & Rubber Company | Multi-ply belt pneumatic tire |
| JP3942649B2 (en) * | 1994-08-25 | 2007-07-11 | 株式会社ブリヂストン | Heavy duty radial tire |
| CN106379115A (en) * | 2016-10-28 | 2017-02-08 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Molding method of high-speed-resisting belted layer of off-road vehicle tire |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL253806A (en) * | 1959-11-10 | |||
| JPS5138121B2 (en) * | 1971-08-10 | 1976-10-20 | ||
| JPS5651923B2 (en) * | 1972-12-29 | 1981-12-09 | ||
| FR2248161A2 (en) * | 1973-10-17 | 1975-05-16 | Uniroyal | Hoop reinforcement plies for radial tyres - comprise both metallic and aromatic polyamide based plies |
-
1977
- 1977-05-03 DE DE7713981U patent/DE7713981U1/en not_active Expired
-
1978
- 1978-04-07 CA CA300,660A patent/CA1086619A/en not_active Expired
- 1978-05-02 JP JP5324178A patent/JPS53136207A/en active Pending
- 1978-05-02 FR FR7812914A patent/FR2389503B1/fr not_active Expired
- 1978-05-02 SE SE7805046A patent/SE7805046L/en unknown
- 1978-05-03 BE BE187369A patent/BE866679A/en unknown
- 1978-05-03 AU AU35683/78A patent/AU516618B2/en not_active Expired
- 1978-05-03 GB GB17456/78A patent/GB1603058A/en not_active Expired
- 1978-05-03 IT IT7868011A patent/IT7868011A0/en unknown
- 1978-05-03 IT IT7853275U patent/IT7853275V0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE866679A (en) | 1978-11-03 |
| AU3568378A (en) | 1979-11-08 |
| JPS53136207A (en) | 1978-11-28 |
| AU516618B2 (en) | 1981-06-11 |
| IT7853275V0 (en) | 1978-05-03 |
| SE7805046L (en) | 1978-11-04 |
| DE7713981U1 (en) | 1977-08-18 |
| FR2389503A1 (en) | 1978-12-01 |
| IT7868011A0 (en) | 1978-05-03 |
| GB1603058A (en) | 1981-11-18 |
| FR2389503B1 (en) | 1983-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |