CA1120842A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- CA1120842A CA1120842A CA000375766A CA375766A CA1120842A CA 1120842 A CA1120842 A CA 1120842A CA 000375766 A CA000375766 A CA 000375766A CA 375766 A CA375766 A CA 375766A CA 1120842 A CA1120842 A CA 1120842A
- Authority
- CA
- Canada
- Prior art keywords
- reinforcing
- belt
- folded
- lateral edges
- tire
- 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
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- Tires In General (AREA)
Abstract
PNEUMATIC TIRE
Abstract An improved pneumatic tire having a reinforcing structure disposed between the tread portion and carcass structure of the tire. The reinforcing structure com-prising of at least one reinforcing belt having its lateral edges folded back upon itself, the folded edge portions extending into the shoulder region of the tire.
The reinforcing structure further comprises of at least one reinforcing cut belt having its lateral edges extend beyond the folded edge portions of the folded reinfor-cing layer. The lateral edges of the second reinforcing belt have a gum strip placed along the entire circum-ferential length thereof.
The foregoing abstract is not to be taken as limiting the invention of the application and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawings and the following detailed description.
Abstract An improved pneumatic tire having a reinforcing structure disposed between the tread portion and carcass structure of the tire. The reinforcing structure com-prising of at least one reinforcing belt having its lateral edges folded back upon itself, the folded edge portions extending into the shoulder region of the tire.
The reinforcing structure further comprises of at least one reinforcing cut belt having its lateral edges extend beyond the folded edge portions of the folded reinfor-cing layer. The lateral edges of the second reinforcing belt have a gum strip placed along the entire circum-ferential length thereof.
The foregoing abstract is not to be taken as limiting the invention of the application and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawings and the following detailed description.
Description
112V8'~;~
BACKGROUND OF THE INVENTION
This invention relates to pneumatic tires, more particularly to an improved high-speed pneumatic tire.
Tires, during use at high-speed operation, experience high centrifugal forces, especially in regions having a higher amount of mass. As a result, tires tend to grow in the shoulder area thereby lowering the performance of the tire and possibly causing premature tire failure.
To reduce the effect of these forces encountered during high-speed operation, tires have been reinforced with various belt structures. Additionally, because of the forces encountered during high-speed operation, belt edge separation in the shoulder area is also a problem.
During high-speed operatlon, the lateral edges of belts tend to pull apart the rubber in the shoulder area; this problem being even more severe with cut belts having their lateral edges in the shoulder area. Therefore, various reinforcing structures used in the prior art for use in high-speed tires have avoided the placement of cut belt edges in the shoulder region.
Applicant has discovered a reinforcement structure which provides the desired performance at high speed and ;~ incorporates the use of cut reinforcing belts.
8~Z
SUMMARY OF THE PRESENT IN~ENTION
An aspect of the invention is as follows:
A pneumatic tire for vehicles comprising a circum-ferentially extending ground-engaging tread portion, a pair of sidewall portions each having an annular inextens-ible bead core, a carcass structure extending circum-ferentially about said tire from said bead portion to said bead portion, a reinforcing structure disposed between said tread portion and said carcass; said tire characterized in that said reinforcing structure comprises a first reinforcing folded belt structure comprislng of one belt having its lateral margins . folded axially inward so that the folded margins are dlsposed radially outward of.the main portion of said folded belt, a second reinforcing belt structure having.two cut belt ply layers disposed radially ~ inward of said first reinforcing belt structure, the : cut reinforcing belt ply adjacent said first rein-' forcing folded belt structure having its lateral edges extend laterally beyond the lateral edges of said first reinforcing layer the cords of said flrst and second reinforcing structures each comprising a plurality of parallel cords made from a material having a high modulus, said first reinforcing ply ..
structure being made from a material ~omprising of aramid.and said second reinforcing structure being made of steel, said cut belt ply layers of said second reinforcing structure having as late~al edges coated with gum strips along its entire circumference.
-ilZ~ Z
DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross-sectional view of a pneumatic tire embodying a belt ~einforcing structure made in accordance with the present invention.
Figure 2 is a diagrammatical representation of a modified reinforcing structure made in accordance with the present invention.
Figure 3 is a diagrammatical representation of another modi~ied reinforcing structure made in accor-dance with the present invention.
Figure 4 is a diagrammatical representation of yet still another modified reinforcing structure made in accordance with the present invention.
Figure 5 is a diagrammatlcal representation of another modified reinforcing structure made in accor-dance with the present invention.
Figure 6 is a diagrammatical representation of yet still another modified reinforcing structure made in accordance with the present invention.
Figure 7 is a diagrammatical representation of another modified reinforcing structure made in accor-dance with the present invention.
Figure 8 is a diagrammatical representation of yet still another modified reinforcing structure made 25 in accordance with the present invention. 4 : :
l~Z()~
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figure 1, there is illustrated a pneumatic tire 1 having a carcass 2, preferably of the radial type construction, and a tread portion 3 overlying the crown region of the carcass 2. The tire 1 is provided with shoulder portions 4 and 5 which merge from the tread portion 3 into sidewalls 6 and 7 respectively.
Placed in between the tread portion 3 and carcass 2 is a reinforcing structure 8 made in accordance with the present invention. The reinforcing structure 8 com-prises of a first folded belt structure 9. In the embodiment illustrated in Figure 1 belt structure 9 comprises of one belt 10 having its lateral margins folded radially outward and back upon itself to form juxtaposed layers 11 and 12. The layers 11 and 12 extend toward the mid-circumferential plane of the tire for a distance of at least equal to 5 percent of `; the tread width but not past the mid-circumferential plane of the tire 1 and terminate in a pair of edges 15 and 16. The belt 10 is folded so that lateral ends 13 and 14 of belt 10 extend into the shoulder regions 4 and 5 of the tire 1. The belt 10 is made from a material having a high modulus. In the preferred embodiment illustrated aramid is used due to its flexibility and ease of folding.
Reinforcing structure 8 further comprises a second belt structure 15 having at least one cut belt 16 having its lateral edges 17 and 18 extend laterally ilZ~
beyond the ends 13 and 14 of folded belt 10 a distance ranging from ~15 inch ~.381 cm) to .5 inch 11.27 cm), preferably a distance ranging from .2 inch (.508 cm) to .3 inch l.762 cm). In the embodiment illustrated the lateral edges 17 and 18 extend laterally beyond ends 13 and 14 about .25 inch (.635 cm). A gum-coating strip 19 is applied to the lateral edges 17 and 18 of belt 16.
The belt 16 is made from a material having a high modulus, preferably steel.
The preferred embodiment shown in Figure 1 illustrates a reinforcing structure having one folded reinforcing belt with the folded marginal edges as being folded radially outward back upon itself, and only one reinforcing belt 15 placed radially inwardly of said first layer. However, various other configura-tions may be constructed in accordance with the present invention, as illustrated in Figures 2 through 8. For example, the folded lateral margins 10 and 11 : may be folded radially outwardly as shown in Figures 3, 4, 7 and 8. If desired, a plurality of folded belts may be provided ~not shown). Further, the second reinforcing structure may be provided with more than one reinforcing cut belt as is illustrated in Figures
BACKGROUND OF THE INVENTION
This invention relates to pneumatic tires, more particularly to an improved high-speed pneumatic tire.
Tires, during use at high-speed operation, experience high centrifugal forces, especially in regions having a higher amount of mass. As a result, tires tend to grow in the shoulder area thereby lowering the performance of the tire and possibly causing premature tire failure.
To reduce the effect of these forces encountered during high-speed operation, tires have been reinforced with various belt structures. Additionally, because of the forces encountered during high-speed operation, belt edge separation in the shoulder area is also a problem.
During high-speed operatlon, the lateral edges of belts tend to pull apart the rubber in the shoulder area; this problem being even more severe with cut belts having their lateral edges in the shoulder area. Therefore, various reinforcing structures used in the prior art for use in high-speed tires have avoided the placement of cut belt edges in the shoulder region.
Applicant has discovered a reinforcement structure which provides the desired performance at high speed and ;~ incorporates the use of cut reinforcing belts.
8~Z
SUMMARY OF THE PRESENT IN~ENTION
An aspect of the invention is as follows:
A pneumatic tire for vehicles comprising a circum-ferentially extending ground-engaging tread portion, a pair of sidewall portions each having an annular inextens-ible bead core, a carcass structure extending circum-ferentially about said tire from said bead portion to said bead portion, a reinforcing structure disposed between said tread portion and said carcass; said tire characterized in that said reinforcing structure comprises a first reinforcing folded belt structure comprislng of one belt having its lateral margins . folded axially inward so that the folded margins are dlsposed radially outward of.the main portion of said folded belt, a second reinforcing belt structure having.two cut belt ply layers disposed radially ~ inward of said first reinforcing belt structure, the : cut reinforcing belt ply adjacent said first rein-' forcing folded belt structure having its lateral edges extend laterally beyond the lateral edges of said first reinforcing layer the cords of said flrst and second reinforcing structures each comprising a plurality of parallel cords made from a material having a high modulus, said first reinforcing ply ..
structure being made from a material ~omprising of aramid.and said second reinforcing structure being made of steel, said cut belt ply layers of said second reinforcing structure having as late~al edges coated with gum strips along its entire circumference.
-ilZ~ Z
DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross-sectional view of a pneumatic tire embodying a belt ~einforcing structure made in accordance with the present invention.
Figure 2 is a diagrammatical representation of a modified reinforcing structure made in accordance with the present invention.
Figure 3 is a diagrammatical representation of another modi~ied reinforcing structure made in accor-dance with the present invention.
Figure 4 is a diagrammatical representation of yet still another modified reinforcing structure made in accordance with the present invention.
Figure 5 is a diagrammatlcal representation of another modified reinforcing structure made in accor-dance with the present invention.
Figure 6 is a diagrammatical representation of yet still another modified reinforcing structure made in accordance with the present invention.
Figure 7 is a diagrammatical representation of another modified reinforcing structure made in accor-dance with the present invention.
Figure 8 is a diagrammatical representation of yet still another modified reinforcing structure made 25 in accordance with the present invention. 4 : :
l~Z()~
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figure 1, there is illustrated a pneumatic tire 1 having a carcass 2, preferably of the radial type construction, and a tread portion 3 overlying the crown region of the carcass 2. The tire 1 is provided with shoulder portions 4 and 5 which merge from the tread portion 3 into sidewalls 6 and 7 respectively.
Placed in between the tread portion 3 and carcass 2 is a reinforcing structure 8 made in accordance with the present invention. The reinforcing structure 8 com-prises of a first folded belt structure 9. In the embodiment illustrated in Figure 1 belt structure 9 comprises of one belt 10 having its lateral margins folded radially outward and back upon itself to form juxtaposed layers 11 and 12. The layers 11 and 12 extend toward the mid-circumferential plane of the tire for a distance of at least equal to 5 percent of `; the tread width but not past the mid-circumferential plane of the tire 1 and terminate in a pair of edges 15 and 16. The belt 10 is folded so that lateral ends 13 and 14 of belt 10 extend into the shoulder regions 4 and 5 of the tire 1. The belt 10 is made from a material having a high modulus. In the preferred embodiment illustrated aramid is used due to its flexibility and ease of folding.
Reinforcing structure 8 further comprises a second belt structure 15 having at least one cut belt 16 having its lateral edges 17 and 18 extend laterally ilZ~
beyond the ends 13 and 14 of folded belt 10 a distance ranging from ~15 inch ~.381 cm) to .5 inch 11.27 cm), preferably a distance ranging from .2 inch (.508 cm) to .3 inch l.762 cm). In the embodiment illustrated the lateral edges 17 and 18 extend laterally beyond ends 13 and 14 about .25 inch (.635 cm). A gum-coating strip 19 is applied to the lateral edges 17 and 18 of belt 16.
The belt 16 is made from a material having a high modulus, preferably steel.
The preferred embodiment shown in Figure 1 illustrates a reinforcing structure having one folded reinforcing belt with the folded marginal edges as being folded radially outward back upon itself, and only one reinforcing belt 15 placed radially inwardly of said first layer. However, various other configura-tions may be constructed in accordance with the present invention, as illustrated in Figures 2 through 8. For example, the folded lateral margins 10 and 11 : may be folded radially outwardly as shown in Figures 3, 4, 7 and 8. If desired, a plurality of folded belts may be provided ~not shown). Further, the second reinforcing structure may be provided with more than one reinforcing cut belt as is illustrated in Figures
2, 4, 6 and 8. Preferably the cut belt which extends laterally beyond the folded edges of the folded belt is adjacent the folded belt. Additionally, it is preferred that the cut belt ending laterally beyond the folded edges is located on the side opposite the folded margin as illustrated in Figures 1, 2, 7 and 8.
ilZ~
While certain representatlve embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit and scope of the .invention.
.
ilZ~
While certain representatlve embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit and scope of the .invention.
.
Claims (3)
1. A pneumatic tire for vehicles comprising a circum-ferentially extending ground-engaging tread portion, a pair of sidewall portions each having an annular inextensible bead core, a carcass structure extending circumferentially about said tire from said bead portion to said bead portion, a reinforcing structure disposed between said tread portion and said carcass; said tire characterized in that said reinforcing structure comprises a first re-inforcing folded belt structure comprising of one belt having its lateral margins folded axially inward so that the folded margins are disposed radially outward of the main portion of said folded belt, a second reinforcing belt structure having two cut belt ply layers disposed radially inward of said first reinforcing belt structure, the cut reinforcing belt ply adjacent said first rein-forcing folded belt structure having its lateral edges extend laterally beyond the lateral edges of said first reinforcing layer the cords of said first and second reinforcing structures each comprising a plurality of parallel cords made from a material having a high modulus, said first reinforcing ply structure being made from a material comprising of aramid and said second reinforcing structure being made of steel, said cut belt ply layers of said second reinforcing structure having as lateral edges coated with gum strips along its entire circum-ference.
2. A tire according to claim 1 wherein said second reinforcing belt layer has its lateral edges extending beyond the lateral ends of said folded belt a distance ranging from .1 inch (.254cm) to .5 inch (1.27cm).
3. A tire according to claim 1 wherein the cut rein-forcing belt ply adjacent said first reinforcing folded belt structure has its lateral edges extending laterally beyond the lateral edges of said first reinforcing layer a distance ranging from .1 inch (.254cm) to .5 inch (1.27cm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000375766A CA1120842A (en) | 1978-05-22 | 1981-04-16 | Pneumatic tire |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90764778A | 1978-05-22 | 1978-05-22 | |
| US907,647 | 1978-05-22 | ||
| CA000325758A CA1117406A (en) | 1978-05-22 | 1979-04-17 | Pneumatic tire |
| CA000375766A CA1120842A (en) | 1978-05-22 | 1981-04-16 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1120842A true CA1120842A (en) | 1982-03-30 |
Family
ID=27166190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375766A Expired CA1120842A (en) | 1978-05-22 | 1981-04-16 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1120842A (en) |
-
1981
- 1981-04-16 CA CA000375766A patent/CA1120842A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |