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WO1999047343A1 - Moyens elastiques de confinement de fluides sous pression, possedant des proprietes de scellement autonome - Google Patents

Moyens elastiques de confinement de fluides sous pression, possedant des proprietes de scellement autonome Download PDF

Info

Publication number
WO1999047343A1
WO1999047343A1 PCT/EP1999/001609 EP9901609W WO9947343A1 WO 1999047343 A1 WO1999047343 A1 WO 1999047343A1 EP 9901609 W EP9901609 W EP 9901609W WO 9947343 A1 WO9947343 A1 WO 9947343A1
Authority
WO
WIPO (PCT)
Prior art keywords
means according
sealing surface
elastomeric material
elastic
containment
Prior art date
Application number
PCT/EP1999/001609
Other languages
English (en)
Inventor
Carlo Antonio Camorani
Original Assignee
Algeri, Maris
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Algeri, Maris filed Critical Algeri, Maris
Priority to AU34110/99A priority Critical patent/AU3411099A/en
Publication of WO1999047343A1 publication Critical patent/WO1999047343A1/fr

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
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/12—Puncture preventing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
    • B29C73/16—Auto-repairing or self-sealing arrangements or agents
    • B29C73/18—Auto-repairing or self-sealing arrangements or agents the article material itself being self-sealing, e.g. by compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
    • B29C73/16—Auto-repairing or self-sealing arrangements or agents
    • B29C73/18—Auto-repairing or self-sealing arrangements or agents the article material itself being self-sealing, e.g. by compression
    • B29C73/20—Auto-repairing or self-sealing arrangements or agents the article material itself being self-sealing, e.g. by compression the article material only consisting in part of a deformable sealing material
    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
    • B29D2030/0686—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre
    • B29D2030/0689—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre by incorporating the sealant into a plurality of chambers, e.g. bags, cells, tubes or closed cavities
    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
    • B29D2030/0686—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre
    • B29D2030/0695—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre the sealant being in the form of one wide strip, e.g. a patch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/24—Endless tubes, e.g. inner tubes for pneumatic tyres
    • B29L2023/245—Inner tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/772—Articles characterised by their shape and not otherwise provided for
    • B29L2031/7734—Spherical

Definitions

  • the invention relates to means for the containment of pressurised fluids, whether gases or liquids, in particular elasto eric material suitable for tyred wheels for vehicles, a method for their manufacture also being envisaged.
  • pressurised fluids whether gases or liquids, in particular elasto eric material suitable for tyred wheels for vehicles, a method for their manufacture also being envisaged.
  • a serious problem for vehicles provided with tyred wheels is that of deflation due to perforation, which not only causes the inconvenience and expense of having to change the wheel, but also and above all creates a situation of considerable danger.
  • a first group comprises systems with a plurality of inner tubes; these solutions are fairly complex since all the inner tubes have to be isolated from each other and therefore have to be inflated separately, and they also result in a considerable increase in the weight of the wheel.
  • a second group comprises systems using an internal tyre lining with a layer of self-sealing product, which according to the various cases can consist of: semifluid substance or mixtures of liquids with powders, possibly contained inside containment layers, low hardness elastomers, elastomers with closed cells filled with pressurised gas, etc.; again, these solutions not only result in increased weight, but can also cause hazardous conditions of unbalance, and furthermore they do not always provide effective, lasting results.
  • a third group consists of self-supporting tyres which permit travel at low speed for a limited distance even when deflated: this is therefore a passive system which does not prevent deflation but does reduce its negative consequences.
  • One aim of the present invention is to provide a flexible fluid sealing means which is capable of maintaining a seal even in the presence of perforations or small cuts.
  • a further aim is to provide a tyred wheel for vehicles which does not deflate even subsequent to perforation, without 2 sacrificing simplicity of construction, reliability and low weight.
  • container means capable of containing a loose product and comprising a body of elastomeric material provided with a sealing surface defined by one face of said body, characterised in that said body is in a state of elastic compression in a plane containing said sealing surface, said state of compression being such as to prevent the leakage of said product through an interruption in the physical continuity of said material.
  • said state of elastic compression acts along each and every direction passing through said portion and parallel to said sealing surface.
  • the expression loose product is taken to mean a fluid product such as a liquid or gas, flowable products such as powders and granules, or mixtures of said flowable products with liquids or gases.
  • containment means capable of containing a pressurised fluid and including a sealing surface which acts against a covering means external to said containment means when said fluid is at its working pressure, characterised in that said sealing surface is provided with ripples when said fluid is at a pressure substantially lower than said working pressure in such a way that said containment means is subjected to compressive stress parallel to said sealing surface when said fluid is at said working pressure.
  • inner tube means for tyres characterised in that it has an external surface provided with corrugations or ripples. It is advantageously envisaged that said elastomeric body be in a state of elastic extension along an orthogonal direction to said sealing surface. In an advantageous embodiment, said body of elastomeric 3 material is associated with a further body capable of maintaining said state of compression.
  • said body of elastomeric material is anchored to and/or resting on said further body.
  • Said body and further body may be integrated.
  • Said body and further body may also consist of the same elastomeric material.
  • said body of elastomeric material may contain said further body inside it.
  • a method for making a containment means that comprises joining a body of elastomeric material to a further body in a connecting surface, either or both the said body and said further body being subjected to elastic stress at least parallel to said connecting surface.
  • Said body and said further body may be joined by gluing.
  • Said stress may occur prior or subsequent to said joining.
  • said stress is a compression to which said body is subjected prior to said gluing.
  • said stress is a tension to which said further body is subjected prior to said gluing.
  • said body can have elastically reduced dimensions along a direction parallel to said connecting surface. It is envisaged that said further body can have larger dimensions along a direction parallel to said connecting surface than the dimensions assumed by said further body after said gluing. Said enlarged dimensions may be obtained by elastic elongation.
  • said body of elastomeric material be provided with a surface intended to rest on said further body and shaped in a rippled manner.
  • a method is envisaged wherein the rippled thickness of said body is reduced while its material thickness is increased.
  • a method is also envisaged for obtaining said elastic reduction in rippled thickness and/or said elastic increase in the material thickness of said body due to pressure exerted by 4 the contained fluid.
  • the invention can be applied to numerous other technical fields, such as: balls of all sizes and in particular for sports use, such as tennis, football, rugby, volleyball, etc., inflatable waterborne or airborne means, life belts, pipes, footwear, gloves and waterproof clothing; it can also be pre-packed in sheets, rolls or other forms for appropriate use.
  • Figure 1 is a cross-sectional view of the containment means in accordance with the invention.
  • Figure 2 is a view as Figure 1, referring to a preceding manufacturing stage, of a first part of said containment means .
  • Figure 3 is a view as Figure 1, referring to a preceding manufacturing stage, of a second part of said containment means .
  • Figure 4 is a view as Figure 1, showing an operational stage of perforation.
  • Figure 5 is a view as Figure 4, showing behaviour in a subsequent operational stage.
  • Figure 6 is a partial cross-section of a tyred vehicle wheel, with the containment means applied according to the invention.
  • Figure 7 is a partial cross-section of a tyred vehicle wheel, with the containment means applied according to a further embodiment of the invention.
  • Figure 8 is a partial cross-section of a detail of Figure 7, in a preceding stage.
  • Figure 9 is a partial cross-section of a further embodiment of 5 the containment means according to the invention.
  • Figure 10 is a partial cross-section of another further embodiment of the containment means according to the invention.
  • Figure 11 is a partial cross-section of a vehicle tyre with the containment means of Figure 9 applied.
  • Figure 12 is a partial cross-section of a vehicle tyre in a variant of the invention, prior to inflation.
  • Figure 13 is a cross-sectional view like that of Figure 12, in another variant.
  • Figure 14 is a partial and interrupted perspective view of an internal part of the tyre shown in Figure 12.
  • Figure 15 is a cross-sectional view like that of Figure 13 after inflation.
  • the containment means 1 consists of a first elastomeric body 2 and a second body 3 anchored to it; said body 3 can advantageously contain a fibrous structure 4 capable of improving the characteristics of non-extensibility.
  • the elastomeric body 2 In its free unstressed state, the elastomeric body 2 has a length A and thickness B, whereas after being anchored to body 3 it has length C and thickness D, A being greater than C and D being greater than B; the body 2 is therefore in a state of elastic extension along the direction M and elastic compression along direction E.
  • Figure 6 shows the application of the invention to a tyred vehicle wheel; a tyre 8 of the so-called tubeless type mounted on a normal rim 9 is provided internally with an elastomeric layer 2 precompressed along directions parallel to the sealing surface 7 and anchored to the external body of the tyre 3 at least at the peripheral areas 10.
  • Figure 7 shows a possible application of the invention for a wheel provided with inner tube 11: in this case the elastomeric body 2 consists of the same inner tube 11, which during operation will have thickness G, whereas in a free condition outside the tyre the same inner tube has thickness H, where H is less than G; this is made possible by using an inner tube whose cross-sectional and diametric extensions are considerably larger than the internal dimensions of the tyre.
  • Figure 9 shows a different configuration of the containment means 12 in which the elastomeric body 2 is anchored in a precompressed manner to body 3a on both faces; the advantage of this configuration lies in the fact that in this case the forces in play are balanced, so such an article can be produced in sheets, rolls or other forms as a semi-finished product for subsequent usage; this can facilitate or obviate the need for precompression operations during the stage of anchoring or resting on body 3.
  • Figure 11 shows an enlarged detail of a tubeless tyre 8, bearing tread marks 13 on its external part and a containment means 12 resting against its inner surface 14, to which it is firmly anchored with an airtight seal, at least in the proximity of the end zone 10.
  • the containment means 12 may in this case consist of a continuous strip cut to a suitable length or of a strip closed in a ring.
  • Figure 10 shows a configuration like that of Figure 9, where however the layer 3a is replaced by a reticular layer, possibly of fibrous fabric 3b, incorporated in the elastomer 7 2.
  • layer 3 and 3a may form a single body with layer 2 without discontinuities as it can consist of the same material .
  • Figures 12, 13, 14 and 15 show a containment means according to the current invention applied to a vehicle tyre in which the body of elastomeric material 2 has a rippled surface with an undulating shape defined by a plurality of surfaces of adjacent and radiused spherical segments 15, in Figure 13 with convexity oriented towards the surface of the tyre casing making up the body 3, and in the variant in Figure 12 with the convexity oriented in the opposite direction.
  • said body 2 has a substantially constant thickness Q and is shaped in such a way as to form depressions alternating with and adjacent to protuberances. Said protuberances and depressions are advantageously connected by inclined and radiused surfaces without undercuts.
  • a first advantage of this embodiment is that it can easily be applied to any normal tyre casing, even one already in use on a vehicle, by inserting inside it an inner tube with a rippled surface according to the invention.
  • this inner tube should have a volume, when filled without undergoing extensional stress, equal to the internal volume of the tyre casing; this way it will be possible to obtain the maximum value of precompression while maintaining ease of insertion and without giving rise to problems of overlapping of folds.
  • a second advantage is that the elastomer is subjected to stress only after inflation, hence reducing problems of ageing in the warehouse.
  • a third advantage is that an inner tube of this type can easily be produced, without significantly higher costs, using the manufacturing techniques used for normal inner tubes, simply by modifying the shape of the pressing-vulcanising mould.
  • This system with rippled body 2 can also be applied to tubeless tyres: in this case said rippled body 2 is firmly anchored with an airtight seal at least in the proximity of the peripheral zones 10 and vent holes 16 may be provided to avoid the accumulation of air.
  • accumulated air is maintained between bodies 2 and 3 in isolated bubbles, body 2 remaining totally or partially corrugated: in this case such air will be evacuated solely in the event of perforation and only from tubeless in the proximity of the perforation itself; therefore to promote an airtight seal of said bubbles, it may be envisaged that sealing or gluing substances be used in the contact zones between bodies 2 and 3.
  • rippled surface may be designed with any shape, overall thickness or size, bearing in mind that the use of a greater thickness Q will permit a self-sealing function even in the event of larger perforations, lacerations or cuts.
  • a further method for the construction of containment means 1, 12 is also envisaged, comprising joining said elastomeric body 2 to a further body 3 and subsequently making said body 2 react with substances capable of causing it to increase in volume.
  • Said substances may consist of solvents such as benzene, methylethylketone, toluene-ethanol azeotrope, etc. It should be emphasised that the construction of a tyre in accordance with the current invention does not preclude the concurrent adoption of other conventional active or passive safety systems in order to obtain maximum reliability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Material Composition (AREA)
  • Gasket Seals (AREA)

Abstract

Ces moyens de confinement (1), conçus pour contenir un fluide sous pression, comprennent un corps en matériau élastomère (2) définissant une surface de scellement (7), ce corps étant dans un état de compression élastique dans un plan parallèle à la surface de scellement (7), de manière à empêcher un fluide de s'échapper en cas d'interruption (6) de la continuité physique dudit matériau.
PCT/EP1999/001609 1998-03-13 1999-03-12 Moyens elastiques de confinement de fluides sous pression, possedant des proprietes de scellement autonome WO1999047343A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34110/99A AU3411099A (en) 1998-03-13 1999-03-12 Elastic means for containment of pressurised fluids with self-sealing properties

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO980049 IT1305466B1 (it) 1998-03-13 1998-03-13 Mezzo elastico per il contenimento di fluidi in pressione,dotato diproprieta' autosigillanti
ITMO98A000049 1998-03-13

Publications (1)

Publication Number Publication Date
WO1999047343A1 true WO1999047343A1 (fr) 1999-09-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/001609 WO1999047343A1 (fr) 1998-03-13 1999-03-12 Moyens elastiques de confinement de fluides sous pression, possedant des proprietes de scellement autonome

Country Status (3)

Country Link
AU (1) AU3411099A (fr)
IT (1) IT1305466B1 (fr)
WO (1) WO1999047343A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6194485B1 (en) 1999-04-01 2001-02-27 Bridgestone Corporation Compounding process for achieving uniform, fine particle size dispersion of curing agents with minimal use of solvents
US6303694B1 (en) 2000-02-18 2001-10-16 Bridgestone Corporation Compounding process for achieving uniform, fine particle size dispersion of curing agents in the substantial absence of solvents and a sealant produced thereby

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498387A (fr) * 1949-09-29
DE645109C (de) * 1937-05-21 Maximilian Rueger Selbstdichtende Reifeneinlage
WO1988006539A1 (fr) * 1987-02-24 1988-09-07 Emanuel Nunes Silva Pneu ou conteneur impermeable de fluides
WO1991000180A1 (fr) * 1989-06-23 1991-01-10 Rochester Medical Devices Article en caoutchouc ''auto-cicatrisant'' et procede pour sa fabrication
FR2652544A1 (fr) * 1989-09-29 1991-04-05 Jiann Jinn Day Pneumatique pour vehicule comprenant des moyens limitant les pertes d'air lors d'une crevaison.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE645109C (de) * 1937-05-21 Maximilian Rueger Selbstdichtende Reifeneinlage
BE498387A (fr) * 1949-09-29
WO1988006539A1 (fr) * 1987-02-24 1988-09-07 Emanuel Nunes Silva Pneu ou conteneur impermeable de fluides
WO1991000180A1 (fr) * 1989-06-23 1991-01-10 Rochester Medical Devices Article en caoutchouc ''auto-cicatrisant'' et procede pour sa fabrication
FR2652544A1 (fr) * 1989-09-29 1991-04-05 Jiann Jinn Day Pneumatique pour vehicule comprenant des moyens limitant les pertes d'air lors d'une crevaison.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6194485B1 (en) 1999-04-01 2001-02-27 Bridgestone Corporation Compounding process for achieving uniform, fine particle size dispersion of curing agents with minimal use of solvents
US6303694B1 (en) 2000-02-18 2001-10-16 Bridgestone Corporation Compounding process for achieving uniform, fine particle size dispersion of curing agents in the substantial absence of solvents and a sealant produced thereby

Also Published As

Publication number Publication date
AU3411099A (en) 1999-10-11
IT1305466B1 (it) 2001-05-09
ITMO980049A1 (it) 1999-09-13

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