CA1115190A - Tubeless pneumatic tire - Google Patents
Tubeless pneumatic tireInfo
- Publication number
- CA1115190A CA1115190A CA332,735A CA332735A CA1115190A CA 1115190 A CA1115190 A CA 1115190A CA 332735 A CA332735 A CA 332735A CA 1115190 A CA1115190 A CA 1115190A
- Authority
- CA
- Canada
- Prior art keywords
- cord
- tire
- cords
- air
- pneumatic 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
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
- B60C9/02—Carcasses
- B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
- B60C9/06—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend diagonally from bead to bead and run in opposite directions in each successive carcass ply, i.e. bias angle ply
-
- 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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
-
- 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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
Abstract of the Disclosure A tubeless pneumatic tire in which that rubberized ply of a toroidal carcass which faces toward an inner cavity of the tire is composed of an air impermeable cord and which is capable of efficiently eliminating an air leak failure without increasing the thickness of an inner liner and without inducing an air trap failure during the manufac-turing step of the tire.
Description
~L51~
This invention relates to a tubeless pneumatic tire and more particularly to an improved carcass construction thereof.
A pneumatic tire is mainly divided into a tubeless tire and a tire including a tube. The tubeless tire is provided at its innermost side in the radial direction with an inner liner composed of a rubber layer impermeable to air.
This construction oE the tubeless tire is different from that of the tire including the tube.
In the course of manufacturing the tubeless pneumatic tire, the rubber layer of the inner liner becomes fluidized, and as a result, the rubber layer becomes locally thin in thickness and tends to easily expose the cords of the carcass ply to the inner cavity of the tire and hence involves the following problems.
That is, the above mentioned exposure of the cords of the carcass ply causes the air filled in the inner cavity of the tire to penetrate from the exposed surface of the cords of the carcass ply into the inside of the cords.
On the one hand, the cord is usually composed of the order of 200 to 300 multifilaments, so that gaps formed between adjacent filaments and between adjacent turns of a stranded filament communicate with each other in the lengthwise direc-tion of the cord. As a result, the air filled in the inner cavity of the tire and penetrated into the inside of the cords flows through the above mentioned communicated gaps, the upper end of a turn-up portion of the carcass ply formed by winding the carcass ply around a bead core and that portion of an outer cover rubber layer which is thinnest in thickness and which corresponds to the upper end of
This invention relates to a tubeless pneumatic tire and more particularly to an improved carcass construction thereof.
A pneumatic tire is mainly divided into a tubeless tire and a tire including a tube. The tubeless tire is provided at its innermost side in the radial direction with an inner liner composed of a rubber layer impermeable to air.
This construction oE the tubeless tire is different from that of the tire including the tube.
In the course of manufacturing the tubeless pneumatic tire, the rubber layer of the inner liner becomes fluidized, and as a result, the rubber layer becomes locally thin in thickness and tends to easily expose the cords of the carcass ply to the inner cavity of the tire and hence involves the following problems.
That is, the above mentioned exposure of the cords of the carcass ply causes the air filled in the inner cavity of the tire to penetrate from the exposed surface of the cords of the carcass ply into the inside of the cords.
On the one hand, the cord is usually composed of the order of 200 to 300 multifilaments, so that gaps formed between adjacent filaments and between adjacent turns of a stranded filament communicate with each other in the lengthwise direc-tion of the cord. As a result, the air filled in the inner cavity of the tire and penetrated into the inside of the cords flows through the above mentioned communicated gaps, the upper end of a turn-up portion of the carcass ply formed by winding the carcass ply around a bead core and that portion of an outer cover rubber layer which is thinnest in thickness and which corresponds to the upper end of
- 2 -.
a rim flange and is radiated into the outside air. The radiation of the air filled in the inner cavity of the tire into the outside air results in a deterioration of the ability of the pneumatic tire. Even though the air filled in the inner cavity of the tire is not radiated into the outside air, the air accumulated in the gaps formed inside the cord becomes expanded due to heat generated inside the tire when it is used, thereby inducing a tire failure such as a separation failure of the inside carcass ply.
On the one hand, the use of the cord which is permeable in its lengthwise direction to air provides the important advantage that it is possible to eliminate the drawback which has been encountered when the tire is manufac-tured by superimposing layers one upon the other. That is, unvulcanized green case is manufactured as follows. In the first place, a plurality of carcass plies are superimposed one upon the other. Then, a side wall rubber, breaker layer and tread portion rubber layer are superimposed one upon the other in the order as mentioned. In this case, more or less amount of air is confined in gaps formed between these superimposed layers. If all of the cords of the carcass ply are made impermeable to air, minute innumerable bubbles confined inside the rubber when it is kneaded and the air confined in the gaps formed between the superimposed layers have no means of escape therefrom and are trapped, thereby significantly reducing the durability of the tire and deteriorating the quality of the tire.
Heretofore, it has been proposed to make the rubber layer of the inner liner thick in thickness for the purpose of preventing the air filled in the inner cavity of the tire from penetrating into the :inside of the carcass.
In this case, the thickness of the cord layer of the inner liner must be made thicker than a thickness which is required for preventing the cords from exposing. The use of inner liner of such large thickness has a number of disadvantages.
In the first place, the tire becomes undesirably heavy in weight. Secondly, the generation of heat in the tire and the fuel cost would be so great as to deteriorate the ability of the tire. Third, the manufacturing cost of the tire becomes excessively increased. Finally, it is impossible to use the carcass for both the tubeless tire and the tire including the tube, thereby requiring much maintenance and increasing the cost.
An object of the invention, therefore, is to provide a tubeless pneumatic tire which can prevent an air leak failure even when the cords of the carcass ply are exposed to the inner cavity of the tire and which does not inlrolve an air trap in the course of manufacturing the tire.
A feature of the invention is the provision in a tubeless pneumatic tire comprising a toroidal carcass composed of a plurality of rubberized plies having cords symmetrically arranged across a pair of bead cores in a sectional plane containing a rotary shaft of the tire, of the improvement in which that rubberized ply of said toroidal carcass which faces toward an inner cavity of said tire is composed of an air impermeable cord which substantially interrupts communication between gaps formed in said cords along the lengthwise direction thereof.
Further objects and features of the invention will be fully understood from the following detailed description with reference to the accompanying drawing, in which:
- A sole figure is a cross-sectional view of a tubeless pneumatic tire embodying the present invention.
In the present invention, it is preferable to use an air impermeable cord including gaps hermetically sealed by a cord treating liquid agent impregnated into the cord under pressure.
The cord is treated twice by means of resorcin-formalin-latex resins (hereinafter will be called as RFL
lQ resin), for example, which has been well known as the cord treating liquid agent. In the first treatment, the cord is immersed into the RFL resin under a given tension in the usual manner and then the cord is dried. Under this condition, the RFL resin is not penetrated into the inner portion of the cord, but a relatively outer surface of the cord only is soaked with the RFL resin and becomes hardened.
Then, the hardened cord is passed between rollers and pressed. Then, the cord is subjected to the second RFL
resin treatment (if necessary, the cord is subjected to the RFL resin treatment for more than two times).
If the compressed cord is subjected to the second RFL resin treatment, the RFL resin formed by the first RFL
resin treatment is crushed to form gaps for guiding the treating liquid into the center portion of the cord.
The second treatment serves to interrupt the communication between the gaps in the cord thus formed, thereby obtaining an air impermeable cord according to the invention.
As the air impermeable cord, use may be made of a monofilament or stranded cord composed of a plurality of relatively large filaments or any other cords in which ~3L5~
constructions, twisting condition, material or the like of the cord are selected such that the treating liquid agent can penetrate into the inner portion of the cord by means of the usual cord treatment.
In the present invention, the air impermeable property of the cord is defined as follows.
5 cords each having a length of 3.8 cm are embedded side by side in a rubber block. Both ends of each cord are exposed from the end surface of the rubber block. To the exposed end of the cord is applied air under pressure of 2 kg/cm2. The amount of air flowed from the exposed end of the cord to the other end thereof, that is, the amount of air flowed along the lengthwise direction of the cord through the gaps in the cord for 30 minutes is measured.
If the value thus measured is substantially equal to 0 cc per unit sectional area with respect to the sectional area of the cord, the cord thus measured satisfies the object of the invention and can be used as the air impermeable cord according to the invention.
In the tubeless pneumatic tire according to the invention, the above mentioned air impermeable cord is arranged at the innermost side of the toroidal carcass in the radial direction of the tire and faced toward the inner cavity of the tire. If the rubberized layer extending from the upper portion of the sidewall where the cord becomes exposed most frequently through the crown portion to the upper portion of the sidewall at the opposed side is composed of the air impermeable cord, it is possible to prevent air leak due to the exposure of the cord without producing any air trap. It is preferable to wind the air impermeable cord layer together with the remaining rubberized layers around one of the bead cores and extend these rubberized layers to the other bead core and wind therearound. Alternatively, these rubberized layers may be terminated at near the bead cores.
The single figure shows a tubeless tire having a carcass construction which is the same as that of a conven-tional tubeless tire and having a tire size of 6.45-14 6 Ply Rating. The carcass is composed of 4 rubberized plies, each ply including nylon cords having bias construction. These 4 rubberized plies are composed of a first ply 1, second ply 2, third ply 3 and fourth ply 4 in the order from the inner ply in the radial direction as mentioned above.
In the drawing, reference numeral 5 designates an inner liner and 6 shows a bead core. In the present embodiment, each of the plies 1 to 4 is wound around the bead core 6 from the inside toward the outside thereof.
In each of the plies 1 to 4, the parallel cords are inclined at an angle of about 35 with respect to the circumferential direction of the tire at the center of its tread portion 7, the cords of one ply extending in an opposite direction with respect to the cords of the other ply.
Each cord is composed of 840 d/2 formed of nylon 6 and subjected to a bonding agent treatment with the aid of resorcin-formalin-latex resin (RFL resin) as usual. If each cord is composed of a multifilament including a bundle of 200 to 300 filaments, the bonding agent or fluid rubber could not penetrate into the center portion of the multi-filament, thereby remaining a center cavity as usual.
In the present invention, the first ply 1 shown by a thick full line in the drawing is composed of cords substantially impermeable to air. That is, in order to eliminate the above mentioned center cavity, the RFL resin used for the conventional RFL resin treatment is made low in concentration and tension subjected to the cords when the cords are subjected to the RFL resin treatment is made low.
The cords are immersed into the RFL resin and then passed through press rolls and drawn therethrough under pressure.
Subsequently, the cords are subjected to a secondary RFL
resin treatment with the aid of the same RFL resin bath.
In this case, a slightly strong tension which is substan-tially the same as that of the conventional RFL resin treat-ment is taken. If necessary, the cords are subjected to a third RFL resin treatment in which the cords are repeatedly immersed into the RFL resin bath under the same condition as the secondary treatment. In this way, provision is made of cords which are substantially impervious to air.
The above mentioned test result of the cords subjected to the secondary treatment was 0 cc/mm3.
The air impervious cords thus obtained is used as the first innermost ply 1 and the remaining plies 2 to 4 are formed of the conventional cords. A tire A constructed as above described according to the invention and a com-parative tire B in which all plies 1 to 4 are composed of the conventional plies are manufactured for trail. These tires A and B are mounted on rims and inflated by air under a given internal pressure.
Experimental tests have demonstrated the result that the tires A and B induce no air trap failure, that the tire A indicates substantially no air leak and that the 5~
COmpaTative tire B induces an air leak.
In the tire A embodying the present invention, if all plies 1 to 4 are composed of the air impermeable cords, it was confirmed that the air leak was not produced, but the air trap was locally produced.
Experimental tests on internal pressure holding ability of the above mentioned tires A and B in which provision is made of an inner liner adapted to be used for the conventional tubeless tire have shown the result listed in the following Table.
\ O A
\ condition Cords are Cords are Cords are Cords are \ tire as not exposed exposed not exposed exposed it is 2.95 2.85 2.92 2.95 30 days(100) (99.0)(100) Internal Leave holding for (100) (94.o) 2 81 (10014) kg/cm Leave _ tire as2.95 2.40 2.73 2.72 165 days(100) ~ 1 (99-3)~98.9) The experimental tests were carried out under an initial internal pressure of 3.0 kg/cm2. The internal pressure holding ability of the comparative tire B in which the cords are not exposed is shown by an index of 100 in parenthesis ( ).
As can be seen from the above Table, the internal g 1~ls~
pressure holding ability of the conventional carcass construction in which the cords are not exposed becomes significantly different from that of the conventional carcass in which the cords are exposed. On the contrary, the internal pressure holding ability of the carcass con-struction according to the invention in which the cords are not exposed is substantially the same as that of the carcass construction according to the invention in which the cords are exposed. As a result, the carcass construction according to the invention does not require the use of the thick inner - liner which has been required for preventing the cords being exposed. As a result, the tubeless pneumatic tire according to the invention can not only be manufactured efficiently but also be used efficiently since the ability of the tire is improved, particularly, it is possible to prevent generation of heat and reduce the weight and hence the fuel cost.
As stated hereinbefore, the tubeless pneumatic tire according to the invention is capable of efficiently eliminating an air leak failure without increasing the thickness of the inner liner and hence without increasing the weight of the tire and without inducing an air trap failure during the manufacturing step of the tire.
a rim flange and is radiated into the outside air. The radiation of the air filled in the inner cavity of the tire into the outside air results in a deterioration of the ability of the pneumatic tire. Even though the air filled in the inner cavity of the tire is not radiated into the outside air, the air accumulated in the gaps formed inside the cord becomes expanded due to heat generated inside the tire when it is used, thereby inducing a tire failure such as a separation failure of the inside carcass ply.
On the one hand, the use of the cord which is permeable in its lengthwise direction to air provides the important advantage that it is possible to eliminate the drawback which has been encountered when the tire is manufac-tured by superimposing layers one upon the other. That is, unvulcanized green case is manufactured as follows. In the first place, a plurality of carcass plies are superimposed one upon the other. Then, a side wall rubber, breaker layer and tread portion rubber layer are superimposed one upon the other in the order as mentioned. In this case, more or less amount of air is confined in gaps formed between these superimposed layers. If all of the cords of the carcass ply are made impermeable to air, minute innumerable bubbles confined inside the rubber when it is kneaded and the air confined in the gaps formed between the superimposed layers have no means of escape therefrom and are trapped, thereby significantly reducing the durability of the tire and deteriorating the quality of the tire.
Heretofore, it has been proposed to make the rubber layer of the inner liner thick in thickness for the purpose of preventing the air filled in the inner cavity of the tire from penetrating into the :inside of the carcass.
In this case, the thickness of the cord layer of the inner liner must be made thicker than a thickness which is required for preventing the cords from exposing. The use of inner liner of such large thickness has a number of disadvantages.
In the first place, the tire becomes undesirably heavy in weight. Secondly, the generation of heat in the tire and the fuel cost would be so great as to deteriorate the ability of the tire. Third, the manufacturing cost of the tire becomes excessively increased. Finally, it is impossible to use the carcass for both the tubeless tire and the tire including the tube, thereby requiring much maintenance and increasing the cost.
An object of the invention, therefore, is to provide a tubeless pneumatic tire which can prevent an air leak failure even when the cords of the carcass ply are exposed to the inner cavity of the tire and which does not inlrolve an air trap in the course of manufacturing the tire.
A feature of the invention is the provision in a tubeless pneumatic tire comprising a toroidal carcass composed of a plurality of rubberized plies having cords symmetrically arranged across a pair of bead cores in a sectional plane containing a rotary shaft of the tire, of the improvement in which that rubberized ply of said toroidal carcass which faces toward an inner cavity of said tire is composed of an air impermeable cord which substantially interrupts communication between gaps formed in said cords along the lengthwise direction thereof.
Further objects and features of the invention will be fully understood from the following detailed description with reference to the accompanying drawing, in which:
- A sole figure is a cross-sectional view of a tubeless pneumatic tire embodying the present invention.
In the present invention, it is preferable to use an air impermeable cord including gaps hermetically sealed by a cord treating liquid agent impregnated into the cord under pressure.
The cord is treated twice by means of resorcin-formalin-latex resins (hereinafter will be called as RFL
lQ resin), for example, which has been well known as the cord treating liquid agent. In the first treatment, the cord is immersed into the RFL resin under a given tension in the usual manner and then the cord is dried. Under this condition, the RFL resin is not penetrated into the inner portion of the cord, but a relatively outer surface of the cord only is soaked with the RFL resin and becomes hardened.
Then, the hardened cord is passed between rollers and pressed. Then, the cord is subjected to the second RFL
resin treatment (if necessary, the cord is subjected to the RFL resin treatment for more than two times).
If the compressed cord is subjected to the second RFL resin treatment, the RFL resin formed by the first RFL
resin treatment is crushed to form gaps for guiding the treating liquid into the center portion of the cord.
The second treatment serves to interrupt the communication between the gaps in the cord thus formed, thereby obtaining an air impermeable cord according to the invention.
As the air impermeable cord, use may be made of a monofilament or stranded cord composed of a plurality of relatively large filaments or any other cords in which ~3L5~
constructions, twisting condition, material or the like of the cord are selected such that the treating liquid agent can penetrate into the inner portion of the cord by means of the usual cord treatment.
In the present invention, the air impermeable property of the cord is defined as follows.
5 cords each having a length of 3.8 cm are embedded side by side in a rubber block. Both ends of each cord are exposed from the end surface of the rubber block. To the exposed end of the cord is applied air under pressure of 2 kg/cm2. The amount of air flowed from the exposed end of the cord to the other end thereof, that is, the amount of air flowed along the lengthwise direction of the cord through the gaps in the cord for 30 minutes is measured.
If the value thus measured is substantially equal to 0 cc per unit sectional area with respect to the sectional area of the cord, the cord thus measured satisfies the object of the invention and can be used as the air impermeable cord according to the invention.
In the tubeless pneumatic tire according to the invention, the above mentioned air impermeable cord is arranged at the innermost side of the toroidal carcass in the radial direction of the tire and faced toward the inner cavity of the tire. If the rubberized layer extending from the upper portion of the sidewall where the cord becomes exposed most frequently through the crown portion to the upper portion of the sidewall at the opposed side is composed of the air impermeable cord, it is possible to prevent air leak due to the exposure of the cord without producing any air trap. It is preferable to wind the air impermeable cord layer together with the remaining rubberized layers around one of the bead cores and extend these rubberized layers to the other bead core and wind therearound. Alternatively, these rubberized layers may be terminated at near the bead cores.
The single figure shows a tubeless tire having a carcass construction which is the same as that of a conven-tional tubeless tire and having a tire size of 6.45-14 6 Ply Rating. The carcass is composed of 4 rubberized plies, each ply including nylon cords having bias construction. These 4 rubberized plies are composed of a first ply 1, second ply 2, third ply 3 and fourth ply 4 in the order from the inner ply in the radial direction as mentioned above.
In the drawing, reference numeral 5 designates an inner liner and 6 shows a bead core. In the present embodiment, each of the plies 1 to 4 is wound around the bead core 6 from the inside toward the outside thereof.
In each of the plies 1 to 4, the parallel cords are inclined at an angle of about 35 with respect to the circumferential direction of the tire at the center of its tread portion 7, the cords of one ply extending in an opposite direction with respect to the cords of the other ply.
Each cord is composed of 840 d/2 formed of nylon 6 and subjected to a bonding agent treatment with the aid of resorcin-formalin-latex resin (RFL resin) as usual. If each cord is composed of a multifilament including a bundle of 200 to 300 filaments, the bonding agent or fluid rubber could not penetrate into the center portion of the multi-filament, thereby remaining a center cavity as usual.
In the present invention, the first ply 1 shown by a thick full line in the drawing is composed of cords substantially impermeable to air. That is, in order to eliminate the above mentioned center cavity, the RFL resin used for the conventional RFL resin treatment is made low in concentration and tension subjected to the cords when the cords are subjected to the RFL resin treatment is made low.
The cords are immersed into the RFL resin and then passed through press rolls and drawn therethrough under pressure.
Subsequently, the cords are subjected to a secondary RFL
resin treatment with the aid of the same RFL resin bath.
In this case, a slightly strong tension which is substan-tially the same as that of the conventional RFL resin treat-ment is taken. If necessary, the cords are subjected to a third RFL resin treatment in which the cords are repeatedly immersed into the RFL resin bath under the same condition as the secondary treatment. In this way, provision is made of cords which are substantially impervious to air.
The above mentioned test result of the cords subjected to the secondary treatment was 0 cc/mm3.
The air impervious cords thus obtained is used as the first innermost ply 1 and the remaining plies 2 to 4 are formed of the conventional cords. A tire A constructed as above described according to the invention and a com-parative tire B in which all plies 1 to 4 are composed of the conventional plies are manufactured for trail. These tires A and B are mounted on rims and inflated by air under a given internal pressure.
Experimental tests have demonstrated the result that the tires A and B induce no air trap failure, that the tire A indicates substantially no air leak and that the 5~
COmpaTative tire B induces an air leak.
In the tire A embodying the present invention, if all plies 1 to 4 are composed of the air impermeable cords, it was confirmed that the air leak was not produced, but the air trap was locally produced.
Experimental tests on internal pressure holding ability of the above mentioned tires A and B in which provision is made of an inner liner adapted to be used for the conventional tubeless tire have shown the result listed in the following Table.
\ O A
\ condition Cords are Cords are Cords are Cords are \ tire as not exposed exposed not exposed exposed it is 2.95 2.85 2.92 2.95 30 days(100) (99.0)(100) Internal Leave holding for (100) (94.o) 2 81 (10014) kg/cm Leave _ tire as2.95 2.40 2.73 2.72 165 days(100) ~ 1 (99-3)~98.9) The experimental tests were carried out under an initial internal pressure of 3.0 kg/cm2. The internal pressure holding ability of the comparative tire B in which the cords are not exposed is shown by an index of 100 in parenthesis ( ).
As can be seen from the above Table, the internal g 1~ls~
pressure holding ability of the conventional carcass construction in which the cords are not exposed becomes significantly different from that of the conventional carcass in which the cords are exposed. On the contrary, the internal pressure holding ability of the carcass con-struction according to the invention in which the cords are not exposed is substantially the same as that of the carcass construction according to the invention in which the cords are exposed. As a result, the carcass construction according to the invention does not require the use of the thick inner - liner which has been required for preventing the cords being exposed. As a result, the tubeless pneumatic tire according to the invention can not only be manufactured efficiently but also be used efficiently since the ability of the tire is improved, particularly, it is possible to prevent generation of heat and reduce the weight and hence the fuel cost.
As stated hereinbefore, the tubeless pneumatic tire according to the invention is capable of efficiently eliminating an air leak failure without increasing the thickness of the inner liner and hence without increasing the weight of the tire and without inducing an air trap failure during the manufacturing step of the tire.
Claims (2)
1. In a tubeless pneumatic tire comprising a toroidal carcass composed of a plurality of rubberized plies having cords consisting of multifilaments, said cords being symmetri-cally arranged across a pair of bead cores in a sectional plane containing a rotary axis of the tire, the improvement wherein only a rubberized ply in said rubberized plies which is adjacent to an inner cavity of said tire is composed of cords containing a cord treating agent penetrating into the innermost center portion of the cord to prevent air communi-cation within individual filaments along the lengthwise direct-ion thereof.
2. The tubeless pneumatic tire according to claim 1, wherein said air impermeable cord is composed of a bundle of multifilaments impregnated with a cord treating liquid agent under a condition that said cord is compressed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9448878A JPS5522533A (en) | 1978-08-04 | 1978-08-04 | Tubeless pneumatic tire |
| JP94,488/78 | 1978-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1115190A true CA1115190A (en) | 1981-12-29 |
Family
ID=14111669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA332,735A Expired CA1115190A (en) | 1978-08-04 | 1979-07-26 | Tubeless pneumatic tire |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5522533A (en) |
| AU (1) | AU517801B2 (en) |
| CA (1) | CA1115190A (en) |
| DE (1) | DE2931629A1 (en) |
| GB (1) | GB2030525B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8508666D0 (en) * | 1985-04-03 | 1985-05-09 | Secretary Trade Ind Brit | Manufacturing coated reinforced plastic articles |
| EP2727721B1 (en) * | 2011-06-30 | 2017-04-19 | Kolon Industries, Inc. | Film for tire inner liner, and preparation method thereof |
-
1978
- 1978-08-04 JP JP9448878A patent/JPS5522533A/en active Granted
-
1979
- 1979-07-25 AU AU49217/79A patent/AU517801B2/en not_active Ceased
- 1979-07-26 CA CA332,735A patent/CA1115190A/en not_active Expired
- 1979-07-31 GB GB7926618A patent/GB2030525B/en not_active Expired
- 1979-08-03 DE DE19792931629 patent/DE2931629A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AU517801B2 (en) | 1981-08-27 |
| AU4921779A (en) | 1980-04-17 |
| GB2030525A (en) | 1980-04-10 |
| GB2030525B (en) | 1983-01-19 |
| JPS5729282B2 (en) | 1982-06-22 |
| JPS5522533A (en) | 1980-02-18 |
| DE2931629A1 (en) | 1980-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4842682A (en) | Heavy duty low-section pneumatic radial tire and a process for manufacturing the same | |
| RU2232075C2 (en) | The method of manufacture of the carcasses for tiers and a carcass produced by this method | |
| CA1212025A (en) | Tire ply splice construction and method of making the same | |
| US5879483A (en) | Pneumatic vehicle tire with breaker ply arrangement cushion layers | |
| JPH0481938B2 (en) | ||
| US4815514A (en) | Belted tire | |
| KR101067636B1 (en) | Pneumatic tire | |
| US3951719A (en) | Vehicle tire construction and method of making same | |
| CA1115190A (en) | Tubeless pneumatic tire | |
| CA1162134A (en) | Pneumatic tire and method for making same | |
| JPH1111113A (en) | Pneumatic tire and drum for molding this pneumatic tire | |
| EP0810105B1 (en) | Pneumatic radial tires provided with a side portion reinforcing layer | |
| US4462448A (en) | Pneumatic tires | |
| EP1013481B1 (en) | Heavy duty pneumatic tire and method of manufacturing the same | |
| GB2096949A (en) | Pneumatic radial tire | |
| JPH1142909A (en) | Pneumatic radial tire and its manufacture | |
| JPS62225406A (en) | Air compressed radial tyre | |
| US3003537A (en) | Pneumatic tire and method of making same | |
| JPH06320922A (en) | Pneumatic radial tire | |
| JP3735447B2 (en) | Pneumatic tire | |
| JP3138755B2 (en) | Manufacturing method of radial tire | |
| US6244318B1 (en) | Pneumatic tires whose bead core has a thick-diameter core wire and a plurality of layers of thin-diameter sheath wires | |
| CA1144463A (en) | Pneumatic tire | |
| US4181168A (en) | Pneumatic tire | |
| JP2004001611A (en) | Pneumatic radial tire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |