GB2033852A - Method of making a pneumatic tyre - Google Patents
Method of making a pneumatic tyre Download PDFInfo
- Publication number
- GB2033852A GB2033852A GB7929856A GB7929856A GB2033852A GB 2033852 A GB2033852 A GB 2033852A GB 7929856 A GB7929856 A GB 7929856A GB 7929856 A GB7929856 A GB 7929856A GB 2033852 A GB2033852 A GB 2033852A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tyre
- reinforcing members
- belt
- diameter
- adhesive mixture
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 34
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000004033 plastic Substances 0.000 claims abstract description 10
- 229920003023 plastic Polymers 0.000 claims abstract description 10
- 238000013459 approach Methods 0.000 claims 2
- 238000003825 pressing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/02—Replaceable treads
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tires In General (AREA)
Abstract
A pneumatic vehicle tyre is produced by a method in which the crown portion of the tyre carcass (1) has firstly a layer (4), secondly reinforcing members (5), and then the tread strip (6) applied thereto, the tyre blank so formed then being placed in a vulcanizing mould in which the diameter of the crown portion is increased. As a result of the diameter increase and because the reinforcing members (5) are substantially parallel to the mid- circumferential plane, the layer (4) formed of a plastics adhesive mixture is forced outwardly between the reinforcing members (5). As illustrated the tyre includes an expansible belt 2. <IMAGE>
Description
SPECIFICATION
Method for the production of a pneumatic vehicle tyre
The present invention relates to a method for the production of a pneumatic vehicle tyre, wherein the crown portion of the tyre substructure substantially of U-shaped cross-section has firstly reinforcing members and then the tread strip applied thereto, whereupon the so fashioned tyre blank is placed in a mould where it has its diameter increased so that it receives its tread surface profiling.
The invention, moreover, preferably also relates to such a pneumatic vehicle tyre which is additionally provided with a belt, which is preferably so equipped, e.g. by the use of intersecting filament-like reinforcing plies extending diagonally to the circumferential direction of the tyre, that with the so-called "residual elevation" of the tyre blank in the mould can have its diameter correspondingly increased.
In such tyre belts, a change of diameter is possible because the individual reinforcing plies can change their angle with respect to the circumferential direction of the tyre. On the other hand, the manufacture of such tyres causes difficulties which are particularly associated with reinforcing plies in the tyre crown portion, which reinforcing plies extend circumferentially at least at such an angle relative to the circumferential direction of the tyre that a diameter increase is no longer possible under the aforesaid conditions.
It is an object of the invention to provide a method which permits the use of reinforcing plies in the tyre crown portion extending at a small angle relative to the circumferential direction of the tyre, but at the same time permits the vulcanizing and pressing of the tyres in a mould which requires a so-called residual elevation or a diameter increase for moulding the tyre profile. The invention at the same time aims at a method which produces a useful tyre of considerable durability.
According to the present invention there is provided a method forthe production of a pneumatic vehicle tyre, wherein the crown portion of the at least pre-cambered tyre substructure has firstly reinforcing members and then the tread strip applied thereto, whereupon the tyre blank so fashioned is
placed into a mould where it has its diameter
increased so that it receives its tread surface profil
ing, in which the reinforcing members are wound
onto a layer formed of a plastics adhesive mixture.
The reinforcing members applied in this manner
during the manufacture of the tyre blank are penetrated in the vulcanizing mould during the so-called
"residual elevation" by the plastics adhesive mixture
and finally enclosed on all sides by this adhesive
mixture. The base for the reinforcing members to be
wound on is thus so to speak pressed through
adjacent reinforcing members, the extent of this
pressing through may be variable.Thus, it is possi
ble for the thickness of the layer of plastics adhesive
mixture to be such that, with the moulded tyre, the
reinforcing members are located substantially on the
outer surface of the belt therebelow and to a certain extent increasable in diameter, whilst a large proportion of the adhesive mixture has been forced through the reinforcing members, in order so at the same time to form the so-called "under rubber", thus a base for the tread strip.
it is thus not absolutely necessary to bring about the pressing through movement by means of a belt located beneath the reinforcing members. This may occur also during the corresponding development of the carcase, even if the belt blank constitutes a substantially flat structure which, subject to extensive internal pressure forces the adhesive mixture in a piston-like mannerthrough the spaces formed between the reinforcing members, when the aforesaid residual elevation is effected. The invention is preferably used in connection with such pneumatic tyres which beneath the reinforcing members have a tyre belt extending substantially over the width of the tread strip.
The present invention will be further illustrated, by way of example, with reference to the accompanying drawings, in which:
Figures 1 and 2 each show a radial part section through a pneumatictyre, Figure 1 showingthetyre blank before insertion in a vulcanizing mould, and
Figure 2 the pneumatic tyre produced from the blank of Figure 1 in the completed vulcanized moulded state.
A tyre belt 2 is first applied to the cambered radial carcase 1 subjected to internal pressure. The belt 2 extends substantially over the width of the subsequent tread strip surface 3. This belt, in known manner, comprises intersecting tension-resistant reinforcing plies in such a mannerthatthe belt 2, when subject to internal pressure, may have a slight diameter increase from diameter dl to diameter d2 imparted thereto. This diameter change is generaily desired in orderto provide a uniform belt structure.
A layer 4 of a plastics adhesive mixture of rubber or the like material is applied on the belt 2. The thickness of the layer 4 is substantially that of the thickness of the belt 2, which in a specific manner permits adhesion to the reinforcing members, e.g.
made of steel, subsequently making contact therewith.
Tension-resistant, slightly resiliently elongatable reinforcing members 5, preferably formed of steel or the like, are then applied to the layer 4 and which are located in the tread strip region and mutually spaced from one another. A blank tread strip 6 is then placed on the reinforcing members 5 in known manner and finally rolled on. Furthertyre components e.g. such for the side walls of the tyre, may also be placed on the tyre carcase 1, which is under internal pressure.
The tyre blank in accordance with Figure 1 is now inserted into the vulcanizing mould; the external diameter is D1.
The carcase 1 is now impacted from the inside of the vulcanizing mould, whereby the outer diameter
of the belt 2 rises to the value D2, but at the same time even with a slight growth of the diameter of the
reinforcing members 5, the layer4 penetrates through the reinforcing members 5 in spaced
arrangement in such a manner that finally in accord
ance with Figure 2, in the moulded state of the tread strip 6, the reinforcing members 5 are substantially arranged on the belt 2 and thereby are completely enclosed by the rubber of the layer 4.
In this final state the tread strip 6 is mouled, whereby the belt 2 simultaneously has received such a diameter increase that it makes contact with the reinforcing members 5 substantially from the inside.
Hence a crown reinforcement is provided which has reinforcing members 5 which extend substantially in the circumferential direction of the tyre. Moreover the tyre has the usual belt reinforcement with diamond bracing.
Claims (7)
1. A method for the production of a pneumatic vehicle tyre, wherein the crown portion of the at least pre-cambered tyre substructure has firstly reinforcing members and then the tread strip applied thereto, whereupon the tyre blank so fashioned is placed into a mould where it has its diameter increased so that it receives its tread surface profiling in which the reinforcing members are wound onto a layerformed of a plastics adhesive mixture.
2. Amethodforthe production of a pneumatic vehicle tyre having a belt as claimed in claim 1, in which on the substructure on the tyre in known manner, there is first applied the tyre belt and then the layer of plastics adhesive mixture of such thickness that, during the diameter increasing of the tyre blankto produce its tread surface profiling the outer surface of the belt either closely approaches the underside of the reinforcing members extending at least substantially in the circumferential direction of the tyre, or even makes contact therewith.
3. A method as claimed in claim 1, in which the plastics adhesive mixture is applied in such quantity that, after the diameter increase of the tyre blank, it encloses the reinforcing members on all sides.
4. A method as claimed in claim 1, in which the plastics adhesive mixture is applied in a layer of such thickness that due to a diameter increase of the tyre belt its external surface closely approaches to the underside of the reinforcing members.
5. A method as claimed in claim 1, in which on the crown portion of the substructure of the tyre, at first a belt comprised of intersecting reinforcing members and adapted to have its diameter slightly increased, and then a plastics adhesive mixture applied thereon.
6. A method for the production of a pneumatic vehicle tyre, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
7. A pneumatic vehicle tyre, whenever produced by a method as claimed in any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2838464A DE2838464C2 (en) | 1978-09-04 | 1978-09-04 | Process for the production of pneumatic vehicle tires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2033852A true GB2033852A (en) | 1980-05-29 |
| GB2033852B GB2033852B (en) | 1983-01-19 |
Family
ID=6048609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7929856A Expired GB2033852B (en) | 1978-09-04 | 1979-08-29 | Method of making a pneumatic tyre |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2838464C2 (en) |
| FR (1) | FR2434700A1 (en) |
| GB (1) | GB2033852B (en) |
| IT (1) | IT1122382B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4781784A (en) * | 1983-07-05 | 1988-11-01 | Apsley Metals Limited | Apparatus for making tire fabric impregnated with rubber |
| EP1106390A1 (en) * | 1999-12-07 | 2001-06-13 | Société de Technologie Michelin | Pneumatic tire with improved endurance |
| US6425426B1 (en) | 1999-12-07 | 2002-07-30 | Michelin Recherche Et Technique S.A. | Pneumatic tire with cords directly contacting tread compound |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58142835A (en) * | 1982-02-17 | 1983-08-25 | Toyo Tire & Rubber Co Ltd | Molding method of radial tire |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1139308A (en) * | 1965-03-24 | 1969-01-08 | Bridgestone Tire Co Ltd | Improvements in radial cord carcass tires and methods of manufacturing radial cord carcass tires |
| DE1906294B1 (en) * | 1969-02-08 | 1970-12-03 | Continental Gummi Werke Ag | Process for making tires |
| US3763913A (en) * | 1972-01-20 | 1973-10-09 | Firestone Tire & Rubber Co | Tire having knit belt |
| US3850219A (en) * | 1972-08-18 | 1974-11-26 | Uniroyal Inc | Steel-belted radial ply tires with o{20 {0 textile cap hand |
| DE2430495C3 (en) * | 1974-06-25 | 1979-02-22 | Continental Gummi-Werke Ag, 3000 Hannover | Method for manufacturing a belted tire |
-
1978
- 1978-09-04 DE DE2838464A patent/DE2838464C2/en not_active Expired
-
1979
- 1979-07-31 IT IT24820/79A patent/IT1122382B/en active
- 1979-08-09 FR FR7920403A patent/FR2434700A1/en active Granted
- 1979-08-29 GB GB7929856A patent/GB2033852B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4781784A (en) * | 1983-07-05 | 1988-11-01 | Apsley Metals Limited | Apparatus for making tire fabric impregnated with rubber |
| EP1106390A1 (en) * | 1999-12-07 | 2001-06-13 | Société de Technologie Michelin | Pneumatic tire with improved endurance |
| WO2001042032A1 (en) * | 1999-12-07 | 2001-06-14 | Michelin Recherche Et Technique S.A. | Pneumatic tire with improved endurance |
| US6425426B1 (en) | 1999-12-07 | 2002-07-30 | Michelin Recherche Et Technique S.A. | Pneumatic tire with cords directly contacting tread compound |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7924820A0 (en) | 1979-07-31 |
| FR2434700A1 (en) | 1980-03-28 |
| GB2033852B (en) | 1983-01-19 |
| DE2838464A1 (en) | 1980-03-20 |
| DE2838464C2 (en) | 1983-12-22 |
| IT1122382B (en) | 1986-04-23 |
| FR2434700B1 (en) | 1983-12-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |