EP2102541A1 - Tuyau souple ayant un assemblage simplifié - Google Patents

Tuyau souple ayant un assemblage simplifié

Info

Publication number
EP2102541A1
EP2102541A1 EP06832327A EP06832327A EP2102541A1 EP 2102541 A1 EP2102541 A1 EP 2102541A1 EP 06832327 A EP06832327 A EP 06832327A EP 06832327 A EP06832327 A EP 06832327A EP 2102541 A1 EP2102541 A1 EP 2102541A1
Authority
EP
European Patent Office
Prior art keywords
end portion
pipe according
closing element
pipe
connection pin
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.)
Withdrawn
Application number
EP06832327A
Other languages
German (de)
English (en)
Inventor
Roberto Defilippi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SumiRiko Italy SpA
Original Assignee
Dytech Dynamic Fluid Technologies SpA
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 Dytech Dynamic Fluid Technologies SpA filed Critical Dytech Dynamic Fluid Technologies SpA
Publication of EP2102541A1 publication Critical patent/EP2102541A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow in pipes or hoses
    • F16L55/11—Plugs

Definitions

  • the present invention relates to a flexible pipe having a radial interference connection portion, specifically for a fuel circuit or a water circuit tube in a motor vehicle.
  • the flexible pipes used in such circuits generally comprise a tube having at least one layer of rubber and are mounted by radial interference on appropriate connection pins .
  • the assembly operation by radial interference may be difficult due to the excessively high friction.
  • the tubes when the tubes are stored and delivered after being manufactured, 'they may be subjected to the action of contaminating elements. Therefore, before assembly in the circuit, an inspection and sometimes also a washing is required, which implies delays in the assembly cycles and additional costs. Otherwise, the fluid circuit results contaminated and a premature, undesired replacement of the corresponding filters is needed.
  • figure 1 is a partial longitudinal section of a flexible pipe according to the present invention
  • figure 2 is a longitudinal section of a component of the flexible pipe in figure 1.
  • numeral 1 represents a flexible pipe which is mounted by radial interference on a connection pin of a fluid circuit in a motor vehicle and is preferably locked by means of a strap F.
  • Flexible pipe 1 comprises a tube 2 formed by a i thermoplastic material and a bushing 3 formed by a thermosetting elastomeric material and inserted in an end portion 4 of tube 2.
  • end portion 4 defines an upsetting 7 protruding from tube 2 in radial direction defining a corresponding annular cavity facing axis A.
  • Bushing 3 is concentric to axis A and comprises a tubular portion 9 inserted in end portion 4 and a flange 10.
  • Flange 10 is arranged on an axial end of tubular portion 9 and defines an axial abutment for an edge 14 of end portion 4.
  • tubular portion 9 defines a contact surface 16 facing axis A and adapted to cooperate by radial interference with connection pin when fluid flows through pipe 1.
  • tubular portion 9 defines an annular rib 17 accommodated in the annual cavity defined by upsetting 7.
  • annular rib 17 is axially positioned so that flange 10 abuts against edge 14 when annular rib 17 itself is accommodated in said annular cavity.
  • end portion 4 has an enlarged diameter with respect to the remaining part of tube 2, which presents an internal diameter essentially equal to the internal diameter of the connection pin so as to decrease load losses as much as possible.
  • the thermoplastic material used to make tube 2 may also be a thermoplastic elastomer, although a polyamide- based material is preferably used.
  • the thermosetting elastomeric material to obtain bushing 2 is chosen on the basis of its compatibility with the fluid to be conveyed.
  • VITON is used if the fluid is a liquid fuel
  • HNBR is used if the fluid consists of fuel v vapours
  • NBR is used if the fluid is water.
  • pipe 1 further comprises a closing element 20 partially inserted in bushing 4 after pipe 1 reaches the end of the manufacturing line and before it is dispatched for assembly on the motor vehicle.
  • closing element 20 comprises an axially closed cylindrical portion 21 inserted by radial interference in bushing 3, and a gripping portion 22 adjacent to cylindrical portion 21 and axially external to pipe 1 when closing element 20 is mounted on the pipe 1 itself.
  • closing element 20 is integrally obtained by moulding of an elastomeric material to allow the demoulding from the mould as described in better detail below.
  • cylindrical portion 21 is coated with a lubricating coating 24 before being inserted in bushing 3.
  • the lubricating material is chosen so as not to induce the deterioration of bushing 3.
  • mineral oil-based lubricating materials such as for example AVANTIN 361 marketed by FIMITOL or MOLLIKOTE marketed by Mollikote, are compatible with most of the materials used to obtain pipe 1.
  • lubricating coating 24 is deposited by means of a distributing machine and the use of a mineral oil-based lubricant also allows to lubricate the distributing machine.
  • Cylindrical portion 21 further defines a plurality of annular protrusions 25 in order to allow a better distribution of lubricating coating 24 as described in better detail below.
  • cylindrical portion 21 defines an imperfection-free surface and specifically free from traces due to mould separation.
  • such surface may be obtained by means of a single mould defining the geometry of cylindrical portion 21 in negative and the use of an elastically deformable polymeric material so as to allow to demould closing element 20 despite annular protrusions 25 and to preserve the geometry defined by the mould after extraction.
  • the profile of cylindrical portion may be obtained by means of a single mould defining the geometry of cylindrical portion 21 in negative and the use of an elastically deformable polymeric material so as to allow to demould closing element 20 despite annular protrusions 25 and to preserve the geometry defined by the mould after extraction.
  • 21 is shaped so as to favour radial settling when closing element 20 is extracted from the mould.
  • each annular protrusion 25 is rounded and joined on both sides by two tapered segments 26, 27 both diverging towards corresponding annular protrusion 25.
  • Tapered segments 26, 27 are further joined to corresponding intermediate segments 28 preferably parallel to axis A and interposed between two adjacent annular protrusions 25 to withhold the lubricant.
  • closing element 20 defines a lightening hole 30 coaxial to axis A and closed by a head portion 31 of cylindrical portion 21.
  • pipe 1 The operation of pipe 1 is as follows.
  • accumulation volumes are defined between cylindrical portion 21 and tubular portion 9. Specifically, accumulation volumes are separated in axial direction by annular protrusions 25 and have a variable radial dimension defined by the difference between the internal radius of tubular portion 9 and that of tapered segments 26, 27 and of intermediate profile 28.
  • closing element 20 remains inserted in bushing 3 " and lubricating coating 24 is withheld in the accumulation volumes.
  • cylindrical portion profile 21 allows to distribute lubricating coating 24 on contact surface 16 to facilitate the insertion on the specific connection pin.
  • Closing element 20 comprising lubricating coating 24 ensures that all pipes 1 are mounted with the presence of lubricant because the operator is obliged to extract the closing element to perform the assembly on the connection pin. Furthermore, closing element 20 is normally used to closed pipe 1 at both ends and protects the inside of tube 2. It is therefore possible to avoid the inspections and the possible washings and to have at the same time the certainty that all pipes 1 are lubricated. i
  • Thermoplastic materials are more easily procurable and have lower costs but are more rigid and therefore require specific systems to allow interference couplings capable of ensuring good fluid tightness.
  • closing element 20 in combination with pipes formed entirely or in part by thermoplastic materials allows to simplify the connection pin insertion operation and to contain manufacturing costs .
  • Annular protrusions 25 define the accumulation volumes which allow to withhold lubricating coating 24 also during long storage periods .
  • closing element 20 allows to adequately distribute lubricating coating 24 on contact surface 16 by means of annular protrusions 25.
  • the surface of cylindrical portion 21 is free from traces deriving from the mould to avoid cutting into bushing 3 during insertion. Indeed, it has been verified that if bushing 3 has scratches having a radial dimension larger than 20 microns, micro-leakages of both vapour and liquid fuel occur.
  • Lightening hole 30 allows to decrease the total amount of material required and thus reduces the manufacturing costs of closing element 20, which are v preferably as low as possible.
  • the profile defined by the two tapered segments 26, 27 further simplifies the extraction from the mould to avoid leaving traces due to the extraction from the mould.
  • a closing element 20 in combination with any pipe presenting a connection by radial interference, -if it is necessary to simplify the operation of insertion on the corresponding connection pin and to protect the inside of tube 2 from contaminating elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

L'invention concerne un tuyau (1) pour un circuit de fluide d'un véhicule à moteur, comprenant un tube (2) présentant au moins une couche formée par une matière polymère et ayant au moins une première partie d'extrémité (4) apte à être introduite par interférence radiale sur une broche de connexion, et un élément de fermeture (20) ayant un axe (A) et comprenant une seconde partie d'extrémité (21) enrobée d'un revêtement de lubrification (24) et apte à être introduite dans la première partie d'extrémité (4) au moyen d'une connexion libérable.
EP06832327A 2006-11-20 2006-11-20 Tuyau souple ayant un assemblage simplifié Withdrawn EP2102541A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000808 WO2008062483A1 (fr) 2006-11-20 2006-11-20 Tuyau souple ayant un assemblage simplifié

Publications (1)

Publication Number Publication Date
EP2102541A1 true EP2102541A1 (fr) 2009-09-23

Family

ID=38457568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06832327A Withdrawn EP2102541A1 (fr) 2006-11-20 2006-11-20 Tuyau souple ayant un assemblage simplifié

Country Status (3)

Country Link
EP (1) EP2102541A1 (fr)
BR (1) BRPI0622067A2 (fr)
WO (1) WO2008062483A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170033375A (ko) * 2014-07-18 2017-03-24 에스에프씨 코니그 아게 밀폐 요소
CN114585850B (zh) * 2019-07-31 2024-06-18 巴西石油公司 用于保护用于陆上和海底管线的有涂层的管的系统以及用于保护管的方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813931A1 (de) * 1998-03-28 1999-09-30 Fte Automotive Gmbh Verschluß für Außen- und/oder Innenanschlüsse und Verfahren zu dessen Herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358869A (en) * 1965-08-19 1967-12-19 Anaconda American Brass Co Vacuum sealing plug
DE2929677A1 (de) * 1979-07-21 1981-02-12 Korfmann Gmbh Maschf Verfahren zum absaugen von gas im steinkohlenbergbau aus bohrloechern mittels verrohrungen und verrohrungen hierzu
GB9711872D0 (en) * 1997-06-10 1997-08-06 Pierce David B Bore plug and bore plugging method
JP2006226472A (ja) * 2005-02-18 2006-08-31 Tokai Rubber Ind Ltd 弾性シール層付き流体輸送用ホース及びその製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813931A1 (de) * 1998-03-28 1999-09-30 Fte Automotive Gmbh Verschluß für Außen- und/oder Innenanschlüsse und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008062483A1 *

Also Published As

Publication number Publication date
BRPI0622067A2 (pt) 2014-05-27
WO2008062483A1 (fr) 2008-05-29

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