EP0774569A1 - Cap for a cooling circuit of a motor vehicle - Google Patents

Cap for a cooling circuit of a motor vehicle Download PDF

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Publication number
EP0774569A1
EP0774569A1 EP96402411A EP96402411A EP0774569A1 EP 0774569 A1 EP0774569 A1 EP 0774569A1 EP 96402411 A EP96402411 A EP 96402411A EP 96402411 A EP96402411 A EP 96402411A EP 0774569 A1 EP0774569 A1 EP 0774569A1
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EP
European Patent Office
Prior art keywords
plug
base
central
disc
valve
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
Application number
EP96402411A
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German (de)
French (fr)
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EP0774569B1 (en
Inventor
Jean-Pierre Lefevre
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.)
Compagnie de Materiel et dEquipements Techniques Comet
Original Assignee
Paul Journee SA
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Application filed by Paul Journee SA filed Critical Paul Journee SA
Publication of EP0774569A1 publication Critical patent/EP0774569A1/en
Application granted granted Critical
Publication of EP0774569B1 publication Critical patent/EP0774569B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0204—Filling
    • F01P11/0209—Closure caps
    • F01P11/0247—Safety; Locking against opening

Definitions

  • the invention relates to a plug for a motor vehicle cooling circuit.
  • the invention relates more particularly to a plug comprising calibration and pressure balancing means, also called a pressostatic plug for closing a cooling circuit of a motor vehicle, of the type in which the plug is received in a base, on the upper end of which it is fixed in the closed position, of the type in which the plug has a lower transverse wall which axially leaktightly separates an upper portion from a lower portion of the base, of the type in which the plug has an upper transverse wall which sealingly isolates the cooling circuit from the atmosphere, of the type in which the lower transverse wall has a normally closed valve which opens beyond a threshold of difference in fluid pressure between the upper and lower portions of the base, of the type in which the valve comprises a valve body mounted movable by ra pport to the plug, the valve body comprising a transverse disc on a lower face of which is fixed an annular sealing membrane intended to be pressed against an annular overpressure seat by a pressure setting spring.
  • calibration and pressure balancing means also called a pressostatic plug for
  • the valve performs both the functions of discharging the overpressure and sealing between the lower portion of the base and the upper portion of the base in which opens a channel connected to the compensation tank.
  • This type of pressostatic plug has the disadvantage, in order to achieve sealing between the lower and upper portions of the base, of requiring that the valve be pressed firmly against its seat and therefore that the overpressure spring is compressed.
  • the value of this initial compression of the overpressure spring depends on the position of the plug relative to the threshold of the base, that is to say that it depends on the actual dimensions of the plug. and the base.
  • the manufacturing tolerances of the various components cause dispersions in the actual positioning of the plug in the base and therefore dispersions in the setting value of the pressure relief valve as a function of the value of the initial compression of the spring.
  • the assembly of the different parts of the plug means that there is generally only a little space left, in the axial direction, for the overpressure spring.
  • the invention proposes a plug of the type described above, characterized in that the annular overpressure seat is arranged on an upper face of the lower transverse wall of the plug which is fixed and which is provided with a central bore for passage of the fluid, and in that the valve body comprises a central leg in two parts, the upper part extends axially downward from a lower face of the transverse disc and through the central bore of the lower transverse wall of the plug, and in that the overpressure spring is a compression spring arranged between a lower face of the lower transverse wall and a crown arranged at the free end of the lower part of the central leg.
  • the pressostatic plug 10 which is shown in Figures 1 to 4 is intended to be fixed in the closed position on the upper end 12 of a base 14 whose lower end 15 is connected to a cooling circuit (not shown) of motor vehicle.
  • the function of the pressostatic plug 10 is, on the one hand, to prevent coolant from escaping to the atmosphere and, on the other hand, to regulate the fluid pressure during operation of the vehicle's heat engine (not shown).
  • the plug 10 carries a valve 16 normally closed and which, in the open position, lets escape of the fluid towards a compensation tank (not shown) via a channel 18 which opens into the base 14.
  • valve 16 opens in a second direction in order to admit fluid from the reservoir. compensation and towards the cooling circuit.
  • the plug 10 is fixed to the base 14 by means of a fixing ring 20 which is screwed onto the upper end 12 of the base 14.
  • the plug 10 comprises a substantially tubular plug body 22 which is rotatably mounted on the fixing ring 20 about its axis X-X and which is received in the base 14, the interior of which is delimited by a substantially cylindrical internal side wall 24.
  • the upper axial end 26 of the plug body 22 is closed by a transverse cover 28 and the plug body 22 comprises, substantially in its middle, a lower transverse wall 30 which is produced integrally with the plug body 22.
  • the valve 16 is arranged inside the tubular plug body 22 and it comprises a valve body 32 of which an upper transverse disc 34 is received between the cover 28 and the lower transverse wall 30.
  • the upper disc 34 has on its lower face 36 an annular sealing membrane 38 which is fixed to the disc 34 by its external periphery 40 while its internal periphery 42 is free.
  • the upper disc 34 has an upper face 37 into which there are holes 35, four in number.
  • the disc 34 In order to center the membrane 38, the disc 34 has on its outer periphery a flange 44 which extends axially downwards in order to form a housing for the membrane 38.
  • the valve body 16 also comprises a central foot 45 in two parts which extends axially downwards from the underside 36 of the disc 34 through a central opening 48 of the membrane 38 and through a central bore 50 of the lower transverse wall 30.
  • the lower part At the free lower axial end 56 of the upper part 46 in the form of a rod of the central leg 45 is mounted the lower part in the form of a crown 54 which is produced in the form of a separate piece resiliently fitted on the end 52 of the upper rod 46 of the central leg 45 so as to be able to pivot relative to the latter in the manner of a ball joint.
  • the crown 54 has a peripheral annular portion 58 which is connected to the central rod 46 by hooks 60 which are four in number and which are angularly distributed in a regular manner.
  • An overpressure spring 62 which, in the example shown in the figures, is a compression coil spring, is pressed at one end against a face lower 64 of the lower transverse wall 30 and by its other end against an upper bearing surface 66 of the annular portion 58 of the crown 54.
  • the hooks 60 of the crown 54 have a first part 61 which extends vertically upwards from the annular portion 58 and which guides the spring 62 which surrounds the crown 54 , thus avoiding any risk of buckling of the spring 62 which could appear due to its great length.
  • the hooks 60 also include a second part 63 which extends the first part, which is bent downwards and towards the inside of the crown 54, and whose free end 65 rests on a substantially spherical upper bearing surface 56 of the lower end 52 of the central leg 46.
  • the lower end 56 of the central rod 46 is introduced axially from above at the center of the crown 54 from which it separates the hooks 60 radially outwards until their free ends 65 fold back elastically to come into abutment against the upper spherical bearing surface 52.
  • the overpressure spring 62 pushes the crown 54 and the valve body 32 axially downward so as to press the outer periphery 40 of the sealing membrane 38 against a corresponding annular seat 68 formed on the upper face 70 of the lower transverse wall 30.
  • the plug 10 delimits waterproof material in the base 14 a lower portion 80 and an upper portion 82.
  • the upper portion 82 of the base 14 is isolated from the atmosphere by the cover 28 and by an upper seal 84, arranged in an annular groove 86 of the external wall 76 of the plug body 12 and which cooperates with a cylindrical bearing surface 88 formed on the internal lateral face 24 of the base 14.
  • the upper portion 82 is formed by two parts 94, 96, respectively inner and outer, which are separated radially by the plug body 12 but which communicate through orifices 90 arranged transversely in the plug body 12 so as to open out on the one hand in an internal face 92 of the plug body 12, above the lower transverse wall 30, and, on the other hand, in its external face 76, between the two seals 72, 84.
  • the pressure in the cooling circuit can increase until it reaches a value threshold which causes the upward movement of the valve body 32 which carries the sealing membrane 38 and of the crown 54, so as to be in the configuration shown in FIG. 2.
  • the overpressure spring 62 is compressed axially and the excess fluid is capable of being evacuated towards the compensation reservoir through the central bore 50 of the lower transverse wall 30, the orifices 90 and the channel 18.
  • the overpressure spring 62 recalls the sealing membrane 38 against its seat 68 so as to re-seal between the lower portions 80 and upper 82 of the base 14, and thus allow the cooling fluid to maintain an overpressure which makes it possible to increase its boiling temperature.
  • the fluid is thus capable of flowing from the compensation tank to the cooling circuit passing through the channel 18, the orifices of the plug body 12, the holes 35 of the valve body 16, the central opening 48 of the membrane 38 and the central bore 50 of the transverse wall 30.
  • valve 16 of the pressostatic plug 10 regulates the pressure of the cooling circuit.
  • One of the advantages of the plug 10 according to the invention is that the threshold value for triggering the valve at overpressure is independent of the fixing of the plug 10 on the base 14.
  • valve 16 and the overpressure seat 68 are linked to the plug 10 so that the relative position of the two elements is not linked to a more or less precise closure of the plug.
  • the arrangement of the overpressure spring 62 below the lower transverse wall 30 makes it possible to use a very long spring without increasing the axial dimension of the plug body 12.
  • the overpressure spring 62 does not act directly on the central leg 46 but on a crown 54 which is mounted on the central leg 32 so as to be able to pivot.
  • the force exerted by the spring on the valve 16 is perfectly centered axially and a contact pressure of the membrane 38 is obtained on its annular overpressure seat 68 which is uniformly distributed.
  • the assembly of a plug 10 according to the invention is carried out as follows.
  • the sealing membrane 38 is fixed to the underside 36 of the valve body 32 which is then engaged axially in the upper axial end 26 of the plug body 12 so that the central rod 46 of the valve body valve 12 passes through the passage 50 of the lower transverse wall 30.
  • the cover 28 is then tightly assembled by screwing, welding or bonding to the upper axial end 26 of the plug body 12.
  • the spring 62 is then introduced axially through the lower axial end of the plug body 12, around the central foot 46 of the valve body 16.
  • the crown 54 is then fitted axially on the free lower end 56 of the central rod 46 by compressing the overpressure spring 62.
  • the fixing ring 20 is finally fitted elastically by force onto the axial upper end 26 of the plug body 12 to form the plug 10.
  • FIGS. 5 to 9 The second embodiment of a pressostatic plug illustrated in FIGS. 5 to 9 will now be described in which components identical, analogous or similar to those described with reference to FIGS. 1 to 4 are designated by the same reference numbers.
  • This embodiment of the pressostatic plug is distinguished first of all from the first embodiment by the design in two parts of the central leg 45 of the valve 32 which is geometrically "inverted" with respect to that described above.
  • the lower part of the central leg 45 is here constituted by the part in the form of a central rod 46, the lower end of which extends radially outwards to constitute the annular peripheral zone 58 whose upper face 66 serves as a support. at the lower end of the valve calibration spring 62.
  • the free upper end 56 of the central rod 46 is generally spherical in shape and its lower part 52 serves of support at the free ends 65 of the four hooks 60 belonging to the upper part 54 of the central leg 45.
  • the upper part 54 of the central leg 45 is substantially in the form of an annular cylindrical skirt 54 which is made integrally with the valve body 32 of which it extends axially downwards from the underside of the latter which carries the sealing membrane 38 and through the central bore 50 of the lower transverse wall 30 of the body 22 of the plug 10.
  • the skirt 54 is an openwork skirt, that is to say that it comprises a series of slots 55 of vertical orientation and angularly distributed in a regular manner.
  • the lower portion of the upper skirt-shaped portion 54 of the central leg 45 is received in a housing 100, of complementary shape and in which it is fixed for example by heat-sealing or by gluing, belonging to a sleeve 102 of generally annular cylindrical shape which extends radially inwards and axially upwards inside the skirt 54 by four hooks 60, the upper free ends 65 of which cooperate with the spherical lower part 52 of the upper free end 56 of the central rod 46 of the lower part of the central leg 45.
  • the two upper 54 and lower 46 parts of the central leg 45 are assembled by elastic fitting of the free spherical upper end 56 of the central rod 46 between the hooks 60 , with interposition of the calibration spring 62.
  • the upper part 54 in the form of a skirt makes it possible to receive, axially movably, a shutter 104 in the form of an inverted pot which is delimited by an annular skirt 106 of axial orientation and by a blind upper transverse wall 108 which extends transversely opposite a flexible sealing seat 110 mounted in an orifice 112 which passes right through the upper transverse wall of the valve body 32 for lead into zone 94 of the upper part of the plug 10.
  • the shutter 104 is capable of moving axially between an open position, illustrated in FIG. 6, in which a passage of fluid is possible through the orifice 112, and a closed position illustrated in FIG. 5 in which the upper transverse wall 108 of the movable shutter 104 closes the orifice 112.
  • tubular lower portion 23 of the body 22 of the plug 10 is perforated, that is to say that it comprises a series of slots 114 of axial orientation and distributed angularly in a regular manner which allow the fluid to pass inside the annular space delimited laterally by the tubular lower part 23 and by the upper part of the central leg 45.
  • the tubular body 22 of the plug 10 is mounted so as to rotate relative to the part 20 of the latter thanks to the arrangement which will now be described in detail.
  • an upper annular portion 21 of the tubular body 22 extends axially upward and is received inside a complementary tubular portion 116 belonging to an upper cap 118 of the plug 10 to which the upper transverse wall belongs. 28.
  • the cap 118 has a general shape of a dome which is extended transversely towards the outside by an edge 120 in the form of a disc which bears against an annular surface opposite 122 of the fixing ring 20.
  • Part 21 is fixed by heat sealing or by gluing to part 116 of the cap 118, the assembly constituted by the cap 118 and the tubular body 22 thus being mounted for rotation relative to the screw ring 20, with the interposition of a lip seal 123.
  • the cap 118 comprises a degassing pipe 124, in the form of a pipette, which here extends radially outward from the central dome-shaped part of the transverse wall 28 cap 116.
  • Line 124 has an internal degassing channel 18 which can thus connect, by means of a flexible pipe (not shown in the figures), an expansion vessel to zone 94 of the upper part of the pressostatic plug 10, the line 18 opening laterally into this zone.
  • the pipe 124 is advantageously produced integrally by molding with the cap 118 and, due to the possibility of rotation of the cap 118 relative to the screw ring 20, the final orientation of the pipe 124 relative to the base is indifferent, that is to say that it does not depend on the final angular position of tightening of the ring 20 relative to the base which receives the plug 10.
  • valve 32 In the event of overpressure, and as illustrated in FIG. 5, the operation of the valve 32 is similar to that which has been described previously with reference to FIGS. 1 to 4.
  • the overpressure appearing inside the cooling circuit causes the valve body 32 to rise, against the return force applied to it by the setting spring 62, to allow the evacuation of the overpressure through the slots 114 and 155, then between the seat 68 and the annular membrane 38, then finally through the degassing channel 18 of the pipe 124 belonging to the cap 118 of the plug 20.
  • the pressure inside the cooling circuit can be restored to atmospheric value thanks to the presence of the movable shutter 104 which is biased axially towards the bottom when the pressure difference between the upper part 94 and the lower part downstream of the orifice 112 and of its sealing seat 110 is positive, so as to allow pressure balancing along the path indicated in the figure 6.
  • the presence of the slots 114 makes it possible to filter the flow of liquid thereby blocking the polluting particles present in the cooling circuit of the engine of the motor vehicle.
  • the orientable pipe 124 simplifies the production of the water boxes of the vehicle and it makes it possible to optimize the design of the circuit whatever the location of the radiator on the vehicle.

Abstract

The cap (10) fits onto the upper end (12) of a base (14). A lower transverse wall (30) separates the upper and lower sections of the base. An upper transverse wall (28) isolates the cooling circuit from the outside atmosphere. The lower transverse wall has a valve (16) with a seat (68), which opens at a given pressure. The valve's annular seat is made on the upper surface of the lower transverse wall which is fixed and has a central aperture (50) for the fluid to pass through. The body of the valve has a central foot in two sections (46,54). The upper section (46) extends downwards axially from the lower face of a transverse disc (34) and through the central aperture. The valve spring (62) is a compression spring fitted between the under surface of the lower transverse partition and a crown (58) on the free end of the lower part of the central foot.

Description

L'invention concerne un bouchon pour un circuit de refroidissement de véhicule automobile.The invention relates to a plug for a motor vehicle cooling circuit.

L'invention concerne plus particulièrement un bouchon comportant des moyens de tarage et d'équilibrage des pressions, aussi appelé bouchon pressostatique pour l'obturation d'un circuit de refroidissement de véhicule automobile, du type dans lequel le bouchon est reçu dans une embase, sur l'extrémité supérieure de laquelle il est fixé en position fermée, du type dans lequel le bouchon comporte une paroi transversale inférieure qui sépare axialement de manière étanche une portion supérieure d'une portion inférieure de l'embase, du type dans lequel le bouchon comporte une paroi transversale supérieure qui isole de manière étanche le circuit de refroidissement de l'atmosphère, du type dans lequel la paroi transversale inférieure comporte un clapet normalement fermé qui s'ouvre au-delà d'un seuil de différence de pression de fluide entre les portions supérieure et inférieure de l'embase, du type dans lequel le clapet comporte un corps de clapet monté mobile par rapport au bouchon, le corps de clapet comportant un disque transversal sur une face inférieure duquel est fixée une membrane d'étanchéité annulaire destinée à être plaquée contre un siège annulaire de surpression par un ressort de tarage de la surpression.The invention relates more particularly to a plug comprising calibration and pressure balancing means, also called a pressostatic plug for closing a cooling circuit of a motor vehicle, of the type in which the plug is received in a base, on the upper end of which it is fixed in the closed position, of the type in which the plug has a lower transverse wall which axially leaktightly separates an upper portion from a lower portion of the base, of the type in which the plug has an upper transverse wall which sealingly isolates the cooling circuit from the atmosphere, of the type in which the lower transverse wall has a normally closed valve which opens beyond a threshold of difference in fluid pressure between the upper and lower portions of the base, of the type in which the valve comprises a valve body mounted movable by ra pport to the plug, the valve body comprising a transverse disc on a lower face of which is fixed an annular sealing membrane intended to be pressed against an annular overpressure seat by a pressure setting spring.

On connaît, par exemple du document US-A-2.203.801, des modes de réalisation d'un tel type de bouchon pressostatique dans lesquels le clapet est en appui contre un siège formé sur l'embase et contre lequel il est sollicité par un ressort de tarage de la surpression qui est agencé entre une paroi transversale supérieure fixe du bouchon et le clapet.We know, for example from document US-A-2.203.801, embodiments of such a type of pressostatic plug in which the valve is in abutment against a seat formed on the base and against which it is urged by a pressure relief spring which is arranged between a fixed upper transverse wall of the plug and the valve.

Dans ce type de réalisation, le clapet assure à la fois les fonctions d'évacuation de la surpression et d'étanchéité entre la portion inférieure de l'embase et la portion supérieure de l'embase dans laquelle débouche un canal relié au réservoir de compensation.In this type of embodiment, the valve performs both the functions of discharging the overpressure and sealing between the lower portion of the base and the upper portion of the base in which opens a channel connected to the compensation tank.

Ce type de bouchon pressostatique présente l'inconvénient, afin de réaliser l'étanchéité entre les portions inférieure et supérieure de l'embase, de nécessiter que le clapet soit plaqué fermement contre son siège et par conséquent que le ressort de surpression soit comprimé.This type of pressostatic plug has the disadvantage, in order to achieve sealing between the lower and upper portions of the base, of requiring that the valve be pressed firmly against its seat and therefore that the overpressure spring is compressed.

Or, dans ce type d'assemblage, la valeur de cette compression initiale du ressort de surpression dépend de la position du bouchon par rapport au seuil de l'embase, c'est-à-dire qu'elle dépend des dimensions réelles du bouchon et de l'embase.However, in this type of assembly, the value of this initial compression of the overpressure spring depends on the position of the plug relative to the threshold of the base, that is to say that it depends on the actual dimensions of the plug. and the base.

Les tolérances de fabrication des différents composants entraînent des dispersions dans le positionnement réel du bouchon dans l'embase et donc des dispersions dans la valeur de tarage du clapet de surpression en fonction de la valeur de la compression initiale du ressort.The manufacturing tolerances of the various components cause dispersions in the actual positioning of the plug in the base and therefore dispersions in the setting value of the pressure relief valve as a function of the value of the initial compression of the spring.

Par ailleurs, dans ce type de réalisation, l'assemblage des différentes pièces du bouchon fait qu'il ne reste généralement que peu de place, selon la direction axiale, pour le ressort de surpression.Furthermore, in this type of embodiment, the assembly of the different parts of the plug means that there is generally only a little space left, in the axial direction, for the overpressure spring.

Cela conduit à utiliser des ressorts de très faible longueur, ce qui nuit à l'obtention d'une très bonne précision de la valeur de tarage de ce ressort de sorte qu'il est difficile de connaître avec exactitude la surpression à laquelle s'ouvre le clapet de surpression.This leads to the use of very short springs, which is detrimental to obtaining very good precision of the setting value of this spring so that it is difficult to know exactly the overpressure to which opens the pressure relief valve.

C'est dans le but d'apporter une solution à ces problèmes que l'invention propose un bouchon du type décrit précédemment, caractérisé en ce que le siège annulaire de surpression est agencé sur une face supérieure de la paroi transversale inférieure du bouchon qui est fixe et qui est munie d'un perçage central de passage du fluide, et en ce que le corps de clapet comporte un pied central en deux parties dont la partie supérieure s'étend axialement vers le bas depuis une face inférieure du disque transversal et au travers du perçage central de la paroi transversale inférieure du bouchon, et en ce que le ressort de surpression est un ressort de compression agencé entre une face inférieure de la paroi transversale inférieure et une couronne agencée à l'extrémité libre de la partie inférieure du pied central.It is with the aim of providing a solution to these problems that the invention proposes a plug of the type described above, characterized in that the annular overpressure seat is arranged on an upper face of the lower transverse wall of the plug which is fixed and which is provided with a central bore for passage of the fluid, and in that the valve body comprises a central leg in two parts, the upper part extends axially downward from a lower face of the transverse disc and through the central bore of the lower transverse wall of the plug, and in that the overpressure spring is a compression spring arranged between a lower face of the lower transverse wall and a crown arranged at the free end of the lower part of the central leg.

Selon d'autres caractéristiques de l'invention :

  • la partie inférieure du pied central est articulée par rapport à la partie supérieure du pied central par une articulation du type à rotule de manière à répartir la force de rappel exercée par le ressort de surpression sur toute la surface du siège de surpression ;
  • l'extrémité inférieure, supérieure, de la partie supérieure, inférieure respectivement, du pied central est sensiblement sphérique, et l'autre partie du pied central comporte une série de crochets dont l'extrémité libre est en appui sur une calotte sphérique supérieure, inférieure respectivement, de ladite extrémité sensiblement sphérique pour permettre l'assemblage par emboîtement élastique des deux parties du pied central et réaliser l'articulation à rotule entre les deux parties du pied central ;
  • la partie supérieure du pied central est une partie en forme de tige dont l'extrémité inférieure libre est sensiblement sphérique, et la partie inférieure comporte une zone annulaire périphérique d'appui du ressort ;
  • les crochets comportent chacun une portion de guidage du ressort qui s'étend sensiblement axialement vers le haut depuis la couronne annulaire en direction de la paroi transversale inférieure du bouchon et qui est prolongée par une portion d'accrochage, recourbée vers l'intérieur et vers le bas, dont l'extrémité libre est en appui sur la calotte sphérique supérieure de l'extrémité inférieure de la partie supérieure en forme de tige du pied central ;
  • selon une variante, la partie inférieure du pied central est une partie en forme de tige dont l'extrémité inférieure est prolongée par ladite zone annulaire périphérique d'appui du ressort et dont l'extrémité supérieure libre est sensiblement sphérique ;
  • la partie supérieure du pied central est une jupe qui s'étend axialement vers le bas à partir de la face inférieure du disque transversal du corps de clapet et à partir de laquelle les crochets s'étendent axialement à l'intérieur et vers le haut de manière que leurs extrémités libres soient en appui sur la calotte sphérique inférieure de l'extrémité supérieure sphérique de la partie inférieure en forme de tige du pied central ;
  • la membrane annulaire d'étanchéité est fixée sur le disque du corps de clapet par sa périphérie externe qui coopère par ailleurs avec le siège annulaire de surpression, sa périphérie interne est libre et le disque comporte au moins un trou qui débouche dans la face inférieure du disque, en regard de la périphérie interne de la membrane d'étanchéité, de sorte qu'en présence d'un excès de pression de fluide dans la portion inférieure de l'embase, la membrane est plaquée contre la face inférieure du disque de manière à obturer le trou de passage, tandis qu'en présence d'un excès de pression dans la portion supérieure de l'embase, la périphérie interne de la membrane s'écarte axialement du disque de manière que le fluide puisse s'écouler vers la portion inférieure de l'embase à travers le trou du disque et du perçage central de la paroi transversale inférieure du bouchon ;
  • les parois transversales supérieure et inférieure délimitent la portion supérieure de l'embase de manière étanche grâce à deux joints annulaires d'étanchéité, supérieur et inférieur, qui sont portés par le bouchon et qui coopèrent chacun avec une portée cylindrique agencée dans une paroi latérale interne de l'embase, et un canal de dégazage débouche dans la paroi latérale interne de l'embase, entre les deux portées de joints ;
  • le bouchon comporte un corps de bouchon tubulaire à l'intérieur duquel sont agencées les parois transversales supérieure et inférieure, le corps de bouchon porte les deux joints d'étanchéité, et le corps de bouchon comporte au moins un orifice libre de passage du fluide qui débouche, sur sa face externe, entre les deux joints d'étanchéité et, sur sa face interne, entre les deux parois transversales ;
  • selon la variante, le bouchon comporte un canal de dégazage qui est formé dans une conduite, de raccordement du bouchon à un vase d'expansion, qui s'étend vers l'extérieur depuis la paroi transversale supérieure du bouchon ;
  • le disque transversal du corps de clapet est percé en son centre d'un orifice, et le corps de clapet reçoit un obturateur mobile axialement qui ferme ledit orifice lorsque la différence de pression entre les portions supérieure et inférieure de l'embase est positive ;
  • l'obturateur est monté mobile axialement à l'intérieure de ladite partie supérieure en forme de jupe du pied central ;
  • la conduite s'étend radialement et est montée à rotation par rapport à une bague de vissage du bouchon sur l'embase.
According to other characteristics of the invention:
  • the lower part of the central leg is articulated with respect to the upper part of the central leg by a ball-type joint so as to distribute the restoring force exerted by the overpressure spring over the entire surface of the overpressure seat;
  • the lower, upper end of the upper, lower part respectively of the central foot is substantially spherical, and the other part of the central foot has a series of hooks the free end of which is supported on an upper, lower spherical cap respectively, of said substantially spherical end to allow the assembly by elastic interlocking of the two parts of the central leg and produce the ball joint between the two parts of the central leg;
  • the upper part of the central leg is a rod-shaped part, the free lower end of which is substantially spherical, and the lower part comprises an annular peripheral zone for supporting the spring;
  • the hooks each have a spring guide portion which extends substantially axially upwards from the annular ring in the direction of the lower transverse wall of the plug and which is extended by a hooking portion, curved inwards and towards the bottom, the free end of which rests on the spherical cap upper from the lower end of the upper rod-shaped part of the central foot;
  • according to a variant, the lower part of the central leg is a rod-shaped part the lower end of which is extended by said annular peripheral zone for bearing the spring and the free upper end of which is substantially spherical;
  • the upper part of the central leg is a skirt which extends axially downwards from the underside of the transverse disc of the valve body and from which the hooks extend axially inside and upwards so that their free ends are supported on the lower spherical cap of the upper spherical end of the lower rod-shaped part of the central leg;
  • the annular sealing membrane is fixed to the disc of the valve body by its external periphery which also cooperates with the annular overpressure seat, its internal periphery is free and the disc has at least one hole which opens into the underside of the disc, facing the internal periphery of the sealing membrane, so that in the presence of an excess of fluid pressure in the lower portion of the base, the membrane is pressed against the underside of the disc so to close the through hole, while in the presence of excess pressure in the upper portion of the base, the internal periphery of the diaphragm departs axially from the disc so that the fluid can flow towards the lower portion of the base through the hole of the disc and of the central bore of the lower transverse wall of the plug;
  • the upper and lower transverse walls delimit the upper portion of the base so watertight thanks to two annular seals, upper and lower, which are carried by the plug and which each cooperate with a cylindrical bearing arranged in an internal side wall of the base, and a degassing channel opens into the internal side wall of the base, between the two joint surfaces;
  • the stopper comprises a tubular stopper body inside which the upper and lower transverse walls are arranged, the stopper body carries the two seals, and the stopper body comprises at least one orifice free of passage for the fluid which opens, on its external face, between the two seals and, on its internal face, between the two transverse walls;
  • according to the variant, the stopper comprises a degassing channel which is formed in a pipe, for connecting the stopper to an expansion vessel, which extends outwards from the upper transverse wall of the stopper;
  • the transverse disc of the valve body is pierced in its center with an orifice, and the valve body receives an axially movable shutter which closes said orifice when the pressure difference between the upper and lower portions of the base is positive;
  • the shutter is mounted axially movable inside said upper part in the form of a skirt of the central leg;
  • the pipe extends radially and is rotatably mounted relative to a ring for screwing the plug onto the base.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue en section axiale d'un premier mode de réalisation d'un bouchon pressostatique selon l'invention représenté au repos ;
  • la figure 2 est une vue similaire à celle de la figure 1 dans laquelle le clapet est ouvert de manière à évacuer une surpression dans le circuit de refroidissement ;
  • la figure 3 est une vue similaire à celle de la figure 1 dans laquelle le clapet est ouvert de manière à admettre du fluide dans le circuit de refroidissement suite à l'apparition d'une dépression dans le circuit de refroidissement ;
  • la figure 4 est une vue partielle en perspective avec arrachement d'un clapet équipant le bouchon des figures 1 à 3 ;
  • la figure 5 est une vue, similaire à celle de la figure 2, qui illustre un second mode de réalisation d'un bouchon pressostatique selon l'invention ;
  • la figure 6 est une vue similaire à celle de la figure 3 du second mode de réalisation ;
  • la figure 7 est une vue latérale externe du bouchon illustré aux figures 5 et 6 ;
  • la figure 8 est une vue de dessus du bouchon de la figure 7 ; et
  • la figure 9 est une vue latérale de gauche du bouchon illustré à la figure 7.
Other characteristics and advantages of the invention will appear on reading the following detailed description for the understanding of which reference will be made to the appended drawings in which:
  • Figure 1 is an axial sectional view of a first embodiment of a pressostatic plug according to the invention shown at rest;
  • Figure 2 is a view similar to that of Figure 1 in which the valve is open so as to release an overpressure in the cooling circuit;
  • Figure 3 is a view similar to that of Figure 1 in which the valve is open so as to admit fluid into the cooling circuit following the appearance of a vacuum in the cooling circuit;
  • Figure 4 is a partial perspective view with cutaway of a valve fitted to the cap of Figures 1 to 3;
  • Figure 5 is a view, similar to that of Figure 2, which illustrates a second embodiment of a pressostatic plug according to the invention;
  • Figure 6 is a view similar to that of Figure 3 of the second embodiment;
  • Figure 7 is an external side view of the plug illustrated in Figures 5 and 6;
  • Figure 8 is a top view of the cap of Figure 7; and
  • FIG. 9 is a left side view of the plug illustrated in FIG. 7.

Le bouchon pressostatique 10 qui est représenté sur les figures 1 à 4 est destiné à être fixé en position fermée sur l'extrémité supérieure 12 d'une embase 14 dont l'extrémité inférieure 15 est reliée à un circuit de refroidissement (non représenté) de véhicule automobile.The pressostatic plug 10 which is shown in Figures 1 to 4 is intended to be fixed in the closed position on the upper end 12 of a base 14 whose lower end 15 is connected to a cooling circuit (not shown) of motor vehicle.

Le bouchon pressostatique 10 a pour fonction, d'une part, d'empêcher que du fluide de refroidissement ne s'échappe vers l'atmosphère et, d'autre part, de réguler la pression du fluide au cours du fonctionnement du moteur thermique (non représenté) du véhicule.The function of the pressostatic plug 10 is, on the one hand, to prevent coolant from escaping to the atmosphere and, on the other hand, to regulate the fluid pressure during operation of the vehicle's heat engine (not shown).

En effet, lors de la montée en température du fluide, la pression de celui-ci augmente et il est nécessaire de prévoir un dispositif qui empêche que cette augmentation de pression ne puisse provoquer la déformation ou la rupture des organes constitutifs du circuit de refroidissement.Indeed, during the rise in temperature of the fluid, the pressure of the latter increases and it is necessary to provide a device which prevents this increase in pressure from being able to cause deformation or rupture of the components of the cooling circuit.

A cet effet, le bouchon 10 porte un clapet 16 normalement fermé et qui, en position ouverte, laisse s'échapper du fluide vers un réservoir de compensation (non représenté) par l'intermédiaire d'un canal 18 qui débouche dans l'embase 14.To this end, the plug 10 carries a valve 16 normally closed and which, in the open position, lets escape of the fluid towards a compensation tank (not shown) via a channel 18 which opens into the base 14.

Au contraire, lorsque le fluide de refroidissement baisse en température, sa pression diminue et, afin d'éviter également la déformation du circuit de refroidissement, le clapet 16 s'ouvre selon un deuxième sens afin d'admettre du fluide en provenance du réservoir de compensation et en direction du circuit de refroidissement.On the contrary, when the cooling fluid drops in temperature, its pressure decreases and, in order also to avoid deformation of the cooling circuit, the valve 16 opens in a second direction in order to admit fluid from the reservoir. compensation and towards the cooling circuit.

Le bouchon 10 est fixé sur l'embase 14 grâce à une bague de fixation 20 qui est vissée sur l'extrémité supérieure 12 de l'embase 14.The plug 10 is fixed to the base 14 by means of a fixing ring 20 which is screwed onto the upper end 12 of the base 14.

Le bouchon 10 comporte un corps de bouchon 22 sensiblement tubulaire qui est monté tournant sur la bague de fixation 20 autour de son axe X-X et qui est reçu dans l'embase 14 dont l'intérieur est délimité par une paroi latérale interne 24 sensiblement cylindrique.The plug 10 comprises a substantially tubular plug body 22 which is rotatably mounted on the fixing ring 20 about its axis X-X and which is received in the base 14, the interior of which is delimited by a substantially cylindrical internal side wall 24.

L'extrémité axiale supérieure 26 du corps de bouchon 22 est obturée par un couvercle transversal 28 et le corps de bouchon 22 comporte, sensiblement en son milieu, une paroi transversale inférieure 30 qui est réalisée venue de matière avec le corps de bouchon 22.The upper axial end 26 of the plug body 22 is closed by a transverse cover 28 and the plug body 22 comprises, substantially in its middle, a lower transverse wall 30 which is produced integrally with the plug body 22.

Le clapet 16 est agencé à l'intérieur du corps de bouchon tubulaire 22 et il comporte un corps de clapet 32 dont un disque supérieur transversal 34 est reçu entre le couvercle 28 et la paroi transversale inférieure 30.The valve 16 is arranged inside the tubular plug body 22 and it comprises a valve body 32 of which an upper transverse disc 34 is received between the cover 28 and the lower transverse wall 30.

Le disque supérieur 34 comporte sur sa face inférieure 36 une membrane d'étanchéité annulaire 38 qui est fixée sur le disque 34 par sa périphérie externe 40 tandis que sa périphérie interne 42 est libre.The upper disc 34 has on its lower face 36 an annular sealing membrane 38 which is fixed to the disc 34 by its external periphery 40 while its internal periphery 42 is free.

Le disque supérieur 34 comporte une face supérieure 37 dans laquelle débouchent des trous 35, au nombre de quatre.The upper disc 34 has an upper face 37 into which there are holes 35, four in number.

Afin de centrer la membrane 38, le disque 34 comporte sur sa périphérie externe un rebord 44 qui s'étend axialement vers le bas afin de former un logement pour la membrane 38.In order to center the membrane 38, the disc 34 has on its outer periphery a flange 44 which extends axially downwards in order to form a housing for the membrane 38.

Le corps de clapet 16 comporte également un pied central 45 en deux parties qui s'étend axialement vers le bas depuis la face inférieure 36 du disque 34 au travers d'une ouverture centrale 48 de la membrane 38 et au travers d'un perçage central 50 de la paroi transversale inférieure 30.The valve body 16 also comprises a central foot 45 in two parts which extends axially downwards from the underside 36 of the disc 34 through a central opening 48 of the membrane 38 and through a central bore 50 of the lower transverse wall 30.

A l'extrémité axiale inférieure libre 56 de la partie supérieure 46 en forme de tige du pied central 45 est montée la partie inférieure en forme de couronne 54 qui est réalisée sous la forme d'une pièce indépendante emboîtée élastiquement sur l'extrémité 52 de la tige supérieure 46 du pied central 45 de manière à pouvoir pivoter par rapport à celui-ci à la manière d'une articulation à rotule.At the free lower axial end 56 of the upper part 46 in the form of a rod of the central leg 45 is mounted the lower part in the form of a crown 54 which is produced in the form of a separate piece resiliently fitted on the end 52 of the upper rod 46 of the central leg 45 so as to be able to pivot relative to the latter in the manner of a ball joint.

La couronne 54 présente une portion annulaire périphérique 58 qui est reliée à la tige centrale 46 par des crochets 60 qui sont au nombre de quatre et qui sont répartis angulairement de manière régulière.The crown 54 has a peripheral annular portion 58 which is connected to the central rod 46 by hooks 60 which are four in number and which are angularly distributed in a regular manner.

Un ressort de surpression 62 qui, dans l'exemple représenté sur les figures, est un ressort à boudin de compression, est en appui par une extrémité contre une face inférieure 64 de la paroi transversale inférieure 30 et par son autre extrémité contre une surface d'appui supérieure 66 de la portion annulaire 58 de la couronne 54.An overpressure spring 62 which, in the example shown in the figures, is a compression coil spring, is pressed at one end against a face lower 64 of the lower transverse wall 30 and by its other end against an upper bearing surface 66 of the annular portion 58 of the crown 54.

Comme on peut le voir plus particulièrement sur la figure 4, les crochets 60 de la couronne 54 comportent une première partie 61 qui s'étend verticalement vers le haut depuis la portion annulaire 58 et qui assure un guidage du ressort 62 qui entoure la couronne 54, évitant ainsi tout risque de flambement du ressort 62 qui pourrait apparaître du fait de sa grande longueur.As can be seen more particularly in FIG. 4, the hooks 60 of the crown 54 have a first part 61 which extends vertically upwards from the annular portion 58 and which guides the spring 62 which surrounds the crown 54 , thus avoiding any risk of buckling of the spring 62 which could appear due to its great length.

Les crochets 60 comportent également une seconde partie 63 qui prolonge la première partie, qui est recourbée vers le bas et vers l'intérieur de la couronne 54, et dont l'extrémité libre 65 repose sur une surface d'appui supérieure 56 sensiblement sphérique de l'extrémité inférieure 52 du pied central 46.The hooks 60 also include a second part 63 which extends the first part, which is bent downwards and towards the inside of the crown 54, and whose free end 65 rests on a substantially spherical upper bearing surface 56 of the lower end 52 of the central leg 46.

Pour l'assemblage du clapet 16, l'extrémité inférieure 56 de la tige centrale 46 est introduite axialement par le haut au centre de la couronne 54 dont elle écarte les crochets 60 radialement vers l'extérieur jusqu'à ce que leurs extrémités libres 65 se rabattent élastiquement pour venir en appui contre la surface d'appui supérieure sphérique 52.For the assembly of the valve 16, the lower end 56 of the central rod 46 is introduced axially from above at the center of the crown 54 from which it separates the hooks 60 radially outwards until their free ends 65 fold back elastically to come into abutment against the upper spherical bearing surface 52.

Ainsi, le ressort de surpression 62 pousse la couronne 54 et le corps de clapet 32 axialement vers le bas de manière à plaquer la périphérie externe 40 de la membrane d'étanchéité 38 contre un siège annulaire 68 correspondant formé sur la face supérieure 70 de la paroi transversale inférieure 30.Thus, the overpressure spring 62 pushes the crown 54 and the valve body 32 axially downward so as to press the outer periphery 40 of the sealing membrane 38 against a corresponding annular seat 68 formed on the upper face 70 of the lower transverse wall 30.

De la sorte, et grâce à un joint d'étanchéité inférieur 72 qui est reçu dans une gorge annulaire 74 formée dans la paroi externe 76 du corps de bouchon 22 et qui coopère avec une portée cylindrique 78 agencée sur la paroi latérale interne 24 de l'embase 14, le bouchon 10 délimite de matière étanche dans l'embase 14 une portion inférieure 80 et une portion supérieure 82.In this way, and thanks to a lower seal 72 which is received in an annular groove 74 formed in the outer wall 76 of the plug body 22 and which cooperates with a cylindrical surface 78 arranged on the inner side wall 24 of the base 14, the plug 10 delimits waterproof material in the base 14 a lower portion 80 and an upper portion 82.

La portion supérieure 82 de l'embase 14 est isolée de l'atmosphère par le couvercle 28 et par un joint d'étanchéité supérieur 84, agencé dans une gorge annulaire 86 de la paroi externe 76 du corps de bouchon 12 et qui coopère avec une portée cylindrique 88 formée sur la face latérale interne 24 de l'embase 14.The upper portion 82 of the base 14 is isolated from the atmosphere by the cover 28 and by an upper seal 84, arranged in an annular groove 86 of the external wall 76 of the plug body 12 and which cooperates with a cylindrical bearing surface 88 formed on the internal lateral face 24 of the base 14.

La portion supérieure 82 est formée de deux parties 94, 96, respectivement intérieure et extérieure, qui sont séparées radialement par le corps de bouchon 12 mais qui communiquent grâce à des orifices 90 agencés transversalement dans le corps de bouchon 12 de manière à déboucher d'une part dans une face interne 92 du corps de bouchon 12, au-dessus de la paroi transversale inférieure 30, et, d'autre part, dans sa face externe 76, entre les deux joints 72, 84.The upper portion 82 is formed by two parts 94, 96, respectively inner and outer, which are separated radially by the plug body 12 but which communicate through orifices 90 arranged transversely in the plug body 12 so as to open out on the one hand in an internal face 92 of the plug body 12, above the lower transverse wall 30, and, on the other hand, in its external face 76, between the two seals 72, 84.

Le fonctionnement du bouchon pressostatique selon l'invention va être maintenant décrit en regard des figures 1 à 3.The operation of the pressostatic plug according to the invention will now be described with reference to FIGS. 1 to 3.

Lorsque la pression dans le circuit de refroidissement augmente, qu'elle est supérieure à la pression atmosphérique mais qu'elle reste inférieure à la pression de seuil de déclenchement du clapet, le ressort de tarage 62 maintient la membrane 38 contre le siège annulaire 68 et la périphérie interne libre 42 de la membrane 38 est plaquée par la pression contre la face inférieure 36 du disque transversal 34 du corps de clapet 32 de manière à obturer les trous 35 et ainsi préserver l'étanchéité entre les portions inférieure 80 et supérieure 82 de l'embaseWhen the pressure in the cooling circuit increases, that it is higher than atmospheric pressure but that it remains lower than the threshold trigger pressure of the valve, the calibration spring 62 holds the membrane 38 against the annular seat 68 and the free internal periphery 42 of the membrane 38 is pressed against the underside 36 of the transverse disc 34 of the valve body 32 so as to close the holes 35 and thus preserve the seal between the lower 80 and upper 82 portions of the base

De la sorte, la pression dans le circuit de refroidissement peut augmenter jusqu'à ce qu'elle atteigne une valeur de seuil qui provoque le déplacement vers le haut du corps de clapet 32 qui porte la membrane d'étanchéité 38 et de la couronne 54, de manière à se retrouver dans la configuration représentée à la figure 2. Dans cette position, le ressort de surpression 62 est comprimé axialement et le fluide excédentaire est susceptible d'être évacué vers le réservoir de compensation au travers du perçage central 50 de la paroi transversale inférieure 30, des orifices 90 et du canal 18.In this way, the pressure in the cooling circuit can increase until it reaches a value threshold which causes the upward movement of the valve body 32 which carries the sealing membrane 38 and of the crown 54, so as to be in the configuration shown in FIG. 2. In this position, the overpressure spring 62 is compressed axially and the excess fluid is capable of being evacuated towards the compensation reservoir through the central bore 50 of the lower transverse wall 30, the orifices 90 and the channel 18.

Lorsque la valeur de la surpression dans le circuit de refroidissement redescend en dessous de la valeur de seuil, le ressort de surpression 62 rappelle la membrane d'étanchéité 38 contre son siège 68 de manière à réaliser à nouveau l'étanchéité entre les portions inférieure 80 et supérieure 82 de l'embase 14, et de permettre ainsi au fluide de refroidissement de maintenir une surpression qui permet d'augmenter sa température d'ébullition.When the value of the overpressure in the cooling circuit drops below the threshold value, the overpressure spring 62 recalls the sealing membrane 38 against its seat 68 so as to re-seal between the lower portions 80 and upper 82 of the base 14, and thus allow the cooling fluid to maintain an overpressure which makes it possible to increase its boiling temperature.

Au contraire, par exemple lorsque le fluide de refroidissement voit sa température diminuer, la pression dans le circuit de refroidissement diminue et, afin d'éviter que la pression atmosphérique externe ne provoque des déformations dans le circuit de refroidissement, il est nécessaire d'admettre dans le circuit de refroidissement du fluide en provenance du réservoir de compensation.On the contrary, for example when the cooling fluid decreases in temperature, the pressure in the cooling circuit decreases and, in order to prevent the external atmospheric pressure from causing deformations in the cooling circuit, it is necessary to admit in the cooling circuit of the fluid coming from the compensation tank.

Sous l'effet de la différence de pression régnant entre les portions inférieure 80 et supérieure 82 de l'embase 14, la périphérie interne 42 de la membrane d'étanchéité 38 est décollée de la face inférieure 36 du disque 34 du corps de clapet 32 et elle libère ainsi le passage à travers les trous 35.Under the effect of the pressure difference prevailing between the lower 80 and upper 82 portions of the base 14, the internal periphery 42 of the sealing membrane 38 is detached from the underside 36 of the disc 34 of the valve body 32 and it thus frees the passage through the holes 35.

Le fluide est ainsi susceptible de circuler du réservoir de compensation au circuit de refroidissement en passant par le canal 18, les orifices du corps de bouchon 12, les trous 35 du corps de clapet 16, l'ouverture centrale 48 de la membrane 38 et le perçage central 50 de la paroi transversale 30.The fluid is thus capable of flowing from the compensation tank to the cooling circuit passing through the channel 18, the orifices of the plug body 12, the holes 35 of the valve body 16, the central opening 48 of the membrane 38 and the central bore 50 of the transverse wall 30.

De la sorte, le clapet 16 du bouchon pressostatique 10 assure la régulation en pression du circuit de refroidissement.In this way, the valve 16 of the pressostatic plug 10 regulates the pressure of the cooling circuit.

Un des avantages du bouchon 10 selon l'invention est que la valeur de seuil de déclenchement du clapet à la surpression est indépendante de la fixation du bouchon 10 sur l'embase 14.One of the advantages of the plug 10 according to the invention is that the threshold value for triggering the valve at overpressure is independent of the fixing of the plug 10 on the base 14.

En effet, le clapet 16 et le siège 68 de surpression sont liés au bouchon 10 de sorte que la position relative des deux éléments n'est pas liée à une fermeture plus ou moins précise du bouchon.Indeed, the valve 16 and the overpressure seat 68 are linked to the plug 10 so that the relative position of the two elements is not linked to a more or less precise closure of the plug.

De plus, la disposition du ressort de surpression 62 en dessous de la paroi transversale inférieure 30 permet d'utiliser un ressort de grande longueur sans augmenter la dimension axiale du corps de bouchon 12.In addition, the arrangement of the overpressure spring 62 below the lower transverse wall 30 makes it possible to use a very long spring without increasing the axial dimension of the plug body 12.

L'utilisation d'un ressort 62 de grande longueur permet d'obtenir une plus grande précision de la valeur de seuil et permet également une plus grande stabilité du clapet 16 lors de ses phases d'ouverture.The use of a spring 62 of great length makes it possible to obtain greater precision of the threshold value and also allows greater stability of the valve 16 during its opening phases.

Par ailleurs, il a été vu que le ressort de surpression 62 n'agit pas directement sur le pied central 46 mais sur une couronne 54 qui est montée sur le pied central 32 de manière à pouvoir pivoter. Ainsi, la force exercée par le ressort sur le clapet 16 est parfaitement centrée axialement et on obtient une pression de contact de la membrane 38 sur son siège annulaire de surpression 68 qui est uniformément répartie.Furthermore, it has been seen that the overpressure spring 62 does not act directly on the central leg 46 but on a crown 54 which is mounted on the central leg 32 so as to be able to pivot. Thus, the force exerted by the spring on the valve 16 is perfectly centered axially and a contact pressure of the membrane 38 is obtained on its annular overpressure seat 68 which is uniformly distributed.

L'assemblage d'un bouchon 10 selon l'invention s'effectue de la manière suivante.The assembly of a plug 10 according to the invention is carried out as follows.

La membrane d'étanchéité 38 est fixée sur la face inférieure 36 du corps de clapet 32 qui est alors engagé axialement dans l'extrémité axiale supérieure 26 du corps de bouchon 12 de manière que la tige centrale 46 du corps de clapet 12 passe au travers du passage 50 de la paroi transversale inférieure 30.The sealing membrane 38 is fixed to the underside 36 of the valve body 32 which is then engaged axially in the upper axial end 26 of the plug body 12 so that the central rod 46 of the valve body valve 12 passes through the passage 50 of the lower transverse wall 30.

Le couvercle 28 est alors assemblé de manière étanche par vissage, soudage ou collage sur l'extrémité axiale supérieure 26 du corps de bouchon 12.The cover 28 is then tightly assembled by screwing, welding or bonding to the upper axial end 26 of the plug body 12.

Le ressort 62 est alors introduit axialement par l'extrémité axiale inférieure du corps de bouchon 12, autour du pied central 46 du corps de clapet 16.The spring 62 is then introduced axially through the lower axial end of the plug body 12, around the central foot 46 of the valve body 16.

La couronne 54 est ensuite emboîtée axialement sur l'extrémité inférieure libre 56 de la tige centrale 46 en comprimant le ressort de surpression 62.The crown 54 is then fitted axially on the free lower end 56 of the central rod 46 by compressing the overpressure spring 62.

La bague de fixation 20 est enfin emboîtée élastiquement à force sur l'extrémité supérieure axiale 26 du corps de bouchon 12 pour former le bouchon 10.The fixing ring 20 is finally fitted elastically by force onto the axial upper end 26 of the plug body 12 to form the plug 10.

On décrira maintenant le second mode de réalisation d'un bouchon pressostatique illustré aux figures 5 à 9 sur lesquelles des composants identiques, analogues ou similaires à ceux décrits en référence aux figures 1 à 4 sont désignés par les mêmes chiffres de référence.The second embodiment of a pressostatic plug illustrated in FIGS. 5 to 9 will now be described in which components identical, analogous or similar to those described with reference to FIGS. 1 to 4 are designated by the same reference numbers.

Ce mode de réalisation du bouchon pressostatique se distingue tout d'abord du premier mode de réalisation par la conception en deux parties du pied central 45 du clapet 32 qui est "inversée" géométriquement par rapport à celle décrite précédemment.This embodiment of the pressostatic plug is distinguished first of all from the first embodiment by the design in two parts of the central leg 45 of the valve 32 which is geometrically "inverted" with respect to that described above.

En effet, la partie inférieure du pied central 45 est ici constituée par la partie en forme de tige centrale 46 dont l'extrémité inférieure se prolonge radialement vers l'extérieur pour constituer la zone annulaire périphérique 58 dont la face supérieure 66 sert d'appui à l'extrémité inférieure du ressort 62 de tarage du clapet.In fact, the lower part of the central leg 45 is here constituted by the part in the form of a central rod 46, the lower end of which extends radially outwards to constitute the annular peripheral zone 58 whose upper face 66 serves as a support. at the lower end of the valve calibration spring 62.

L'extrémité supérieure libre 56 de la tige centrale 46 est de forme générale sphérique et sa partie inférieure 52 sert d'appui aux extrémités libres 65 des quatre crochets 60 appartenant à la partie supérieure 54 du pied central 45.The free upper end 56 of the central rod 46 is generally spherical in shape and its lower part 52 serves of support at the free ends 65 of the four hooks 60 belonging to the upper part 54 of the central leg 45.

Dans ce deuxième mode de réalisation, la partie supérieure 54 du pied central 45 se présente sensiblement sous la forme d'une jupe cylindrique annulaire 54 qui est réalisée venue de matière avec le corps de clapet 32 dont elle s'étend axialement vers le bas depuis la face inférieure de ce dernier qui porte la membrane d'étanchéité 38 et au travers du perçage central 50 de la paroi transversale inférieure 30 du corps 22 du bouchon 10.In this second embodiment, the upper part 54 of the central leg 45 is substantially in the form of an annular cylindrical skirt 54 which is made integrally with the valve body 32 of which it extends axially downwards from the underside of the latter which carries the sealing membrane 38 and through the central bore 50 of the lower transverse wall 30 of the body 22 of the plug 10.

La jupe 54 est une jupe ajourée, c'est-à-dire qu'elle comporte une série de fentes 55 d'orientation verticale et réparties angulairement de manière régulière.The skirt 54 is an openwork skirt, that is to say that it comprises a series of slots 55 of vertical orientation and angularly distributed in a regular manner.

La portion inférieure de la partie supérieure en forme de jupe 54 du pied central 45 est reçue dans un logement 100, de forme complémentaire et dans lequel elle est fixée par exemple par thermosoudage ou par collage, appartenant à un manchon 102 de forme générale annulaire cylindrique qui se prolonge radialement vers l'intérieur et axialement vers le haut à l'intérieur de la jupe 54 par quatre crochets 60 dont les extrémités libres supérieures 65 coopèrent avec la partie inférieure sphérique 52 de l'extrémité libre supérieure 56 de la tige centrale 46 de la partie inférieure du pied central 45.The lower portion of the upper skirt-shaped portion 54 of the central leg 45 is received in a housing 100, of complementary shape and in which it is fixed for example by heat-sealing or by gluing, belonging to a sleeve 102 of generally annular cylindrical shape which extends radially inwards and axially upwards inside the skirt 54 by four hooks 60, the upper free ends 65 of which cooperate with the spherical lower part 52 of the upper free end 56 of the central rod 46 of the lower part of the central leg 45.

Comme dans le cas du premier mode de réalisation décrit précédemment, l'assemblage des deux parties supérieure 54 et inférieure 46 du pied central 45 s'effectue par emboîtement élastique de l'extrémité supérieure libre sphérique 56 de la tige centrale 46 entre les crochets 60, avec interposition du ressort de tarage 62.As in the case of the first embodiment described above, the two upper 54 and lower 46 parts of the central leg 45 are assembled by elastic fitting of the free spherical upper end 56 of the central rod 46 between the hooks 60 , with interposition of the calibration spring 62.

La partie supérieure 54 en forme de jupe permet de recevoir, de manière mobile axialement, un obturateur 104 en forme de pot renversé qui est délimité par une jupe annulaire 106 d'orientation axiale et par une paroi transversale supérieure borgne 108 qui s'étend transversalement en regard d'un siège d'étanchéité souple 110 monté dans un orifice 112 qui traverse de part en part la paroi transversale supérieure du corps de clapet 32 pour déboucher dans la zone 94 de la partie supérieure du bouchon 10.The upper part 54 in the form of a skirt makes it possible to receive, axially movably, a shutter 104 in the form of an inverted pot which is delimited by an annular skirt 106 of axial orientation and by a blind upper transverse wall 108 which extends transversely opposite a flexible sealing seat 110 mounted in an orifice 112 which passes right through the upper transverse wall of the valve body 32 for lead into zone 94 of the upper part of the plug 10.

L'obturateur 104 est susceptible de se déplacer axialement entre une position d'ouverture, illustrée à la figure 6, dans laquelle un passage de fluide est possible à travers l'orifice 112, et une position de fermeture illustrée à la figure 5 dans laquelle la paroi transversale supérieure 108 de l'obturateur mobile 104 obture l'orifice 112.The shutter 104 is capable of moving axially between an open position, illustrated in FIG. 6, in which a passage of fluid is possible through the orifice 112, and a closed position illustrated in FIG. 5 in which the upper transverse wall 108 of the movable shutter 104 closes the orifice 112.

Comme on peut le voir sur les figures 5 à 7 et 9, la portion inférieure tubulaire 23 du corps 22 du bouchon 10 est ajourée, c'est-à-dire qu'elle comporte une série de fentes 114 d'orientation axiale et réparties angulairement de manière régulière qui permettent au fluide de passer à l'intérieur de l'espace annulaire délimité latéralement par la partie inférieure tubulaire 23 et par la partie supérieure du pied central 45.As can be seen in Figures 5 to 7 and 9, the tubular lower portion 23 of the body 22 of the plug 10 is perforated, that is to say that it comprises a series of slots 114 of axial orientation and distributed angularly in a regular manner which allow the fluid to pass inside the annular space delimited laterally by the tubular lower part 23 and by the upper part of the central leg 45.

Le corps tubulaire 22 du bouchon 10 est monté de manière tournante par rapport à la partie 20 de ce dernier grâce à l'agencement qui va maintenant être décrit en détails.The tubular body 22 of the plug 10 is mounted so as to rotate relative to the part 20 of the latter thanks to the arrangement which will now be described in detail.

A cet effet, une portion annulaire supérieure 21 du corps tubulaire 22 s'étend axialement vers le haut et elle est reçue à l'intérieur d'une portion tubulaire complémentaire 116 appartenant à un capuchon supérieur 118 du bouchon 10 auquel appartient la paroi transversale supérieure 28.To this end, an upper annular portion 21 of the tubular body 22 extends axially upward and is received inside a complementary tubular portion 116 belonging to an upper cap 118 of the plug 10 to which the upper transverse wall belongs. 28.

Le capuchon 118 présente une forme générale de dôme qui se prolonge transversalement vers l'extérieur par un bord 120 en forme de disque qui prend appui contre une surface annulaire en vis-à-vis 122 de la bague de fixation 20.The cap 118 has a general shape of a dome which is extended transversely towards the outside by an edge 120 in the form of a disc which bears against an annular surface opposite 122 of the fixing ring 20.

La partie 21 est fixée par thermosoudage ou par collage à la partie 116 du capuchon 118, l'ensemble constitué par le capuchon 118 et le corps tubulaire 22 étant ainsi monté à rotation par rapport à la bague de vissage 20, avec interposition d'un joint d'étanchéité à lèvre 123.Part 21 is fixed by heat sealing or by gluing to part 116 of the cap 118, the assembly constituted by the cap 118 and the tubular body 22 thus being mounted for rotation relative to the screw ring 20, with the interposition of a lip seal 123.

Conformément à une autre caractéristique de l'invention, le capuchon 118 comporte une conduite 124 de dégazage, en forme de pipette, qui s'étend ici radialement vers l'extérieur à partir de la partie centrale en forme de dôme de la paroi transversale 28 du capuchon 116.According to another characteristic of the invention, the cap 118 comprises a degassing pipe 124, in the form of a pipette, which here extends radially outward from the central dome-shaped part of the transverse wall 28 cap 116.

La conduite 124 comporte un canal interne de dégazage 18 qui peut ainsi relier, au moyen d'une canalisation souple (non représentée sur les figures), un vase d'expansion à la zone 94 de la partie supérieure du bouchon pressostatique 10, le conduit 18 débouchant latéralement dans cette zone.Line 124 has an internal degassing channel 18 which can thus connect, by means of a flexible pipe (not shown in the figures), an expansion vessel to zone 94 of the upper part of the pressostatic plug 10, the line 18 opening laterally into this zone.

La conduite 124 est réalisée avantageusement venue de matière par moulage avec le capuchon 118 et, du fait de la possibilité de rotation du capuchon 118 par rapport à la bague de vissage 20, l'orientation finale de la conduite 124 par rapport à l'embase est indifférente, c'est-à-dire qu'elle ne dépend pas de la position angulaire finale de serrage de la bague 20 par rapport à l'embase qui reçoit le bouchon 10.The pipe 124 is advantageously produced integrally by molding with the cap 118 and, due to the possibility of rotation of the cap 118 relative to the screw ring 20, the final orientation of the pipe 124 relative to the base is indifferent, that is to say that it does not depend on the final angular position of tightening of the ring 20 relative to the base which receives the plug 10.

En cas de surpression, et comme cela est illustré à la figure 5, le fonctionnement du clapet 32 est analogue à celui qui a été décrit précédemment en référence aux figures 1 à 4.In the event of overpressure, and as illustrated in FIG. 5, the operation of the valve 32 is similar to that which has been described previously with reference to FIGS. 1 to 4.

En effet, la surpression apparaissant à l'intérieur du circuit de refroidissement provoque le soulèvement du corps de clapet 32, à l'encontre de l'effort de rappel qui lui est appliqué par le ressort de tarage 62, pour permettre l'évacuation de la surpression à travers les fentes 114 et 155, puis entre le siège 68 et la membrane annulaire 38, puis enfin à travers le canal 18 de dégazage de la conduite 124 appartenant au capuchon 118 du bouchon 20.Indeed, the overpressure appearing inside the cooling circuit causes the valve body 32 to rise, against the return force applied to it by the setting spring 62, to allow the evacuation of the overpressure through the slots 114 and 155, then between the seat 68 and the annular membrane 38, then finally through the degassing channel 18 of the pipe 124 belonging to the cap 118 of the plug 20.

Cette évacuation de la surpression ne peut pas se faire à travers l'orifice 112 car le liquide en surpression provoque aussi simultanément le soulèvement de l'obturateur mobile 104 qui obture l'orifice 112, un effet de chicane étant ainsi obtenu pour la circulation du fluide en surpression.This evacuation of the overpressure cannot be done through the orifice 112 because the liquid under overpressure also simultaneously causes the lifting of the movable shutter 104 which closes the orifice 112, a chicane effect being thus obtained for the circulation of the overpressure fluid.

Dans le cas d'une dépression, et comme cela est illustré à la figure 6, la pression à l'intérieur du circuit de refroidissement peut être rétablie à la valeur atmosphérique grâce à la présence de l'obturateur mobile 104 qui est sollicité axialement vers le bas lorsque la différence de pression entre la partie supérieure 94 et la partie inférieure en aval de l'orifice 112 et de son siège d'étanchéité 110 est positive, de manière à permettre l'équilibrage des pressions selon le trajet indiqué sur la figure 6.In the case of a vacuum, and as illustrated in FIG. 6, the pressure inside the cooling circuit can be restored to atmospheric value thanks to the presence of the movable shutter 104 which is biased axially towards the bottom when the pressure difference between the upper part 94 and the lower part downstream of the orifice 112 and of its sealing seat 110 is positive, so as to allow pressure balancing along the path indicated in the figure 6.

Selon une variante de réalisation qui n'est pas illustrée aux figures 5 et 6, il est possible de prévoir un petit ressort de tarage de l'obturateur mobile 104 qui sollicite en permanence ce dernier vers la position de fermeture de l'orifice 112 et qui détermine ainsi une valeur de tarage de l'ouverture à la dépression du bouchon pressostatique 110.According to an alternative embodiment which is not illustrated in FIGS. 5 and 6, it is possible to provide a small setting spring for the movable shutter 104 which permanently biases the latter towards the position of closing the orifice 112 and which thus determines a calibration value of the opening at depression of the pressostatic plug 110.

Outre les avantages qui ont été mentionnés précédemment en référence au premier mode de réalisation, la présence des fentes 114 permet de filtrer le flux de liquide en bloquant ainsi les particules polluantes présentes dans le circuit de refroidissement du moteur du véhicule automobile.In addition to the advantages which have been mentioned previously with reference to the first embodiment, the presence of the slots 114 makes it possible to filter the flow of liquid thereby blocking the polluting particles present in the cooling circuit of the engine of the motor vehicle.

La conduite orientable 124 simplifie la réalisation des boîtes à eau du véhicule et elle permet d'optimiser la conception du circuit quel que soit l'implantation du radiateur sur le véhicule.The orientable pipe 124 simplifies the production of the water boxes of the vehicle and it makes it possible to optimize the design of the circuit whatever the location of the radiator on the vehicle.

Claims (14)

Bouchon pour l'obturation d'un circuit de refroidissement de véhicule automobile, du type dans lequel le bouchon (10) est reçu dans une embase (14), sur l'extrémité supérieure(12) de laquelle il est fixé en position fermée, du type dans lequel le bouchon (10) comporte une paroi transversale inférieure (30) qui sépare axialement de manière étanche une portion supérieure (82) d'une portion inférieure (80) de l'embase (14), du type dans lequel le bouchon (10) comporte une paroi transversale supérieure (28) qui isole de manière étanche le circuit de refroidissement de l'atmosphère, du type dans lequel la paroi transversale inférieure (30) comporte un clapet (16) normalement fermé qui s'ouvre au-delà d'un seuil de différence de pression de fluide entre les portions supérieure (82) et inférieure (80) de l'embase 14), du type dans lequel le clapet (16) comporte un corps de clapet (32) monté mobile par rapport au bouchon (10), le corps de clapet (32) comportant un disque transversal (34) sur une face inférieure (36) duquel est fixée une membrane d'étanchéité annulaire (38) destinée à être plaquée contre un siège annulaire (68) de surpression par un ressort (62) de tarage de la surpression, caractérisé en ce que le siège annulaire (68) de surpression est agencé sur une face supérieure (70) de la paroi transversale inférieure (30) du bouchon (10) qui est fixe et qui est munie d'un perçage central (50) de passage du fluide, et en ce que le corps de clapet (32) comporte un pied central (45) en deux parties (46,54) dont la partie supérieure (46, 54) s'étend axialement vers le bas depuis une face inférieure (36) du disque transversal (34) et au travers du perçage central (50) de la paroi transversale inférieure (30) du bouchon (10), et en ce que le ressort de surpression (62) est un ressort de compression agencé entre une face inférieure (64) de la paroi transversale inférieure (30) et une couronne (58) agencée à l'extrémité libre de la partie inférieure (54, 46) du pied central (45).Plug for closing a motor vehicle cooling circuit, of the type in which the plug (10) is received in a base (14), on the upper end (12) of which it is fixed in the closed position, of the type in which the plug (10) has a lower transverse wall (30) which axially leaktightly separates an upper portion (82) from a lower portion (80) of the base (14), of the type in which the plug (10) has an upper transverse wall (28) which sealingly isolates the cooling circuit from the atmosphere, of the type in which the lower transverse wall (30) comprises a normally closed valve (16) which opens to the -beyond a fluid pressure difference threshold between the upper (82) and lower (80) portions of the base 14), of the type in which the valve (16) comprises a valve body (32) mounted to move relative to the plug (10), the valve body (32) comprising a disc e transverse (34) on a lower face (36) of which is fixed an annular sealing membrane (38) intended to be pressed against an annular seat (68) overpressure by a spring (62) for setting the overpressure, characterized in that the annular overpressure seat (68) is arranged on an upper face (70) of the lower transverse wall (30) of the plug (10) which is fixed and which is provided with a central bore (50) for passage fluid, and in that the valve body (32) comprises a central foot (45) in two parts (46,54), the upper part (46, 54) of which extends axially downwards from a lower face ( 36) of the transverse disc (34) and through the central bore (50) of the lower transverse wall (30) of the plug (10), and in that the overpressure spring (62) is a compression spring arranged between a lower face (64) of the lower transverse wall (30) and a crown (58) arranged at the free end of the lower part (54, 46) of the central leg (45). Bouchon selon la revendication 1, caractérisé en ce que la partie inférieure (54, 46) du pied central (45) est articulée par rapport à la partie supérieure (46, 54) du pied central (45) par une articulation du type à rotule de manière à répartir la force de rappel exercée par le ressort (62) de surpression sur toute la surface du siège (68) de surpression.Cap according to claim 1, characterized in that the lower part (54, 46) of the central leg (45) is articulated with respect to the upper part (46, 54) of the central leg (45) by a ball-and-socket joint so as to distribute the restoring force exerted by the overpressure spring (62) over the entire surface of the overpressure seat (68). Bouchon selon la revendication 2, caractérisé en ce que l'extrémité inférieure (56), supérieure, de la partie supérieure (46, 54), inférieure respectivement, du pied central (45) est sensiblement sphérique, et en ce que l'autre partie (54, 46) du pied central (45, 58) comporte une série de crochets (60) dont l'extrémité libre (65) est en appui sur une calotte sphérique (52) supérieure, inférieure respectivement, de ladite extrémité (56) sensiblement sphérique pour permettre l'assemblage par emboîtement élastique des deux parties (46, 54) du pied central (45) et réaliser l'articulation à rotule entre les deux parties du pied central.Cap according to claim 2, characterized in that the lower end (56), upper, of the upper part (46, 54), lower respectively, of the central leg (45) is substantially spherical, and in that the other part (54, 46) of the central leg (45, 58) comprises a series of hooks (60), the free end (65) of which rests on a spherical cap (52) upper, lower respectively, of said end (56 ) substantially spherical to allow the assembly by elastic fitting of the two parts (46, 54) of the central foot (45) and produce the ball joint between the two parts of the central foot. Bouchon selon la revendication précédente, caractérisé en ce que la partie supérieure du pied central (45) est une partie en forme de tige (46) dont l'extrémité inférieure libre (56) est sensiblement sphérique, et en ce que la partie inférieure (54) comporte une zone annulaire périphérique (58) d'appui du ressort (62).Cap according to the preceding claim, characterized in that the upper part of the central leg (45) is a rod-shaped part (46) whose free lower end (56) is substantially spherical, and in that the lower part ( 54) has a peripheral annular zone (58) for supporting the spring (62). Bouchon selon la revendication 4, caractérisé en ce que les crochets (60) comportent chacun une portion (61) de guidage du ressort (62) qui s'étend sensiblement axialement vers le haut depuis la couronne annulaire (58) en direction de la paroi transversale inférieure (30) du bouchon (10) et qui est prolongée par une portion (63) d'accrochage, recourbée vers l'intérieur et vers le bas, dont l'extrémité libre (65) est en appui sur la calotte sphérique supérieure (52) de l'extrémité inférieure (56) de la partie supérieure en forme de tige (46) du pied central (45).Cap according to claim 4, characterized in that the hooks (60) each comprise a portion (61) for guiding the spring (62) which extends substantially axially upwards from the annular ring (58) in the direction of the wall lower transverse (30) of the plug (10) and which is extended by a hooking portion (63), curved inwards and downwards, the free end (65) of which rests on the upper spherical cap (52) of the lower end (56) of the upper rod-shaped part (46) of the central leg (45). Bouchon selon la revendication 3, caractérisé en ce que la partie inférieure (46) du pied central (45) est une partie en forme de tige (46) dont l'extrémité inférieure est prolongée par ladite couronne annulaire périphérique (58) d'appui du ressort (62) et dont l'extrémité supérieure libre (56) est sensiblement sphérique.Cap according to claim 3, characterized in that the lower part (46) of the central leg (45) is a rod-shaped part (46) the lower end of which is extended by said peripheral annular crown (58) of the spring (62) and whose free upper end (56) is substantially spherical. Bouchon selon la revendication précédente, caractérisé en ce que la partie supérieure (54) du pied central (45) est une jupe qui s'étend axialement vers le bas à partir de la face inférieure (36) du disque transversal (34) du corps de clapet (32) et à partir de laquelle les crochets (60) s'étendent axialement à l'intérieur et vers le haut de manière que leurs extrémités libres (65) soient en appui sur la calotte sphérique inférieure (52) de l'extrémité supérieure sphérique (56) de la partie inférieure en forme de tige (46) du pied central (45).Cap according to the preceding claim, characterized in that the upper part (54) of the central leg (45) is a skirt which extends axially downwards from the lower face (36) of the transverse disc (34) of the body valve (32) and from which the hooks (60) extend axially inside and upwards so that their free ends (65) are supported on the lower spherical cap (52) of the spherical upper end (56) of the lower rod-shaped part (46) of the central leg (45). Bouchon selon l'une des revendications 4 ou 5, caractérisé en ce que la membrane annulaire (38) d'étanchéité est fixée sur le disque (34) du corps de clapet (32) par sa périphérie externe (40) qui coopère par ailleurs avec le siège annulaire (68) de surpression, en ce que sa périphérie interne (42) est libre et en ce que le disque (34) comporte au moins un trou (35) qui débouche dans la face inférieure (36) du disque (34), en regard de la périphérie interne (42) de la membrane d'étanchéité (38), de sorte qu'en présence d'un excès de pression de fluide dans la portion inférieure (80) de l'embase (14), la membrane (38) est plaquée contre la face inférieure (36) du disque (34) de manière à obturer le trou (35) de passage, tandis qu'en présence d'un excès de pression dans la portion supérieure (82) de l'embase (14), la périphérie interne (42) de la membrane (38) s'écarte axialement du disque (34) de manière que le fluide puisse s'écouler vers la portion inférieure (80) de l'embase (14) à travers le trou (35) du disque (34) et du perçage central (50) de la paroi transversale inférieure (30) du bouchon (10).Cap according to one of claims 4 or 5, characterized in that the annular sealing membrane (38) is fixed to the disc (34) of the valve body (32) by its external periphery (40) which also cooperates with the annular seat (68) of overpressure, in that its internal periphery (42) is free and in that the disc (34) has at least one hole (35) which opens into the underside (36) of the disc ( 34), facing the internal periphery (42) of the sealing membrane (38), so that in the presence of an excess of fluid pressure in the lower portion (80) of the base (14) , the membrane (38) is pressed against the underside (36) of the disc (34) so as to close the hole (35) of passage, while in the presence of excess pressure in the upper portion (82) of the base (14), the internal periphery (42) of the membrane (38) deviates axially from the disc (34) of so that the fluid can flow towards the lower portion (80) of the base (14) through the hole (35) of the disc (34) and of the central bore (50) of the lower transverse wall (30) of the plug (10). Bouchon selon l'une quelconque des revendications 4, 5 ou 8, caractérisé en ce que les parois transversales supérieure (28) et inférieure (30) délimitent la portion supérieure (82) de l'embase (14) de manière étanche grâce à deux joints annulaires d'étanchéité, supérieur (84) et inférieur (72), qui sont portés par le bouchon (10) et qui coopèrent chacun avec une portée cylindrique (78, 88) agencée dans une paroi latérale interne (24) de l'embase (14), et en ce qu'un canal de dégazage (18) débouche dans la paroi latérale interne (24) de l'embase (14), entre les deux portées de joints (78, 88).Cap according to any one of Claims 4, 5 or 8, characterized in that the upper (28) and lower (30) transverse walls delimit the upper portion (82) of the base (14) in a sealed manner by means of two upper (84) and lower (72) seals, which are carried by the plug (10) and which each cooperate with a cylindrical seat (78, 88) arranged in an internal side wall (24) of the base (14), and in that a degassing channel (18) opens into the internal lateral wall (24) of the base (14), between the two bearing surfaces of seals (78, 88). Bouchon selon la revendication précédente, caractérisé en ce qu'il comporte un corps de bouchon tubulaire (22) à l'intérieur duquel sont agencées les parois transversales supérieure (28) et inférieure (38), en ce que le corps de bouchon (22) porte les deux joints d'étanchéité (72, 84), et en ce que le corps de bouchon (22) comporte au moins un orifice libre (90) de passage du fluide qui débouche, sur sa face externe (76), entre les deux joints d'étanchéité (72, 84) et, sur sa face interne (92), entre les deux parois transversales (28, 30).Plug according to the preceding claim, characterized in that it comprises a tubular plug body (22) inside which the upper (28) and lower (38) transverse walls are arranged, in that the plug body (22 ) carries the two seals (72, 84), and in that the plug body (22) has at least one free orifice (90) for passage of the fluid which opens, on its external face (76), between the two seals (72, 84) and, on its internal face (92), between the two transverse walls (28, 30). Bouchon selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'il comporte un canal de dégazage (18) qui est formé dans une conduite (124), de raccordement du bouchon à un vase d'expansion, qui s'étend vers l'extérieur depuis la paroi transversale supérieure (28) du bouchon.Plug according to any one of claims 1 to 7, characterized in that it comprises a degassing channel (18) which is formed in a pipe (124), for connection from the stopper to an expansion tank, which extends outwards from the upper transverse wall (28) of the stopper. Bouchon selon l'une des revendications 6,7 ou 11, caractérisé en ce que le disque transversal (34) du corps de clapet (32) est percé en son centre d'un orifice (112), et en ce que le corps de clapet reçoit un obturateur (104) mobile axialement qui ferme ledit orifice (112) lorsque la différence de pression entre les portions supérieure et inférieure de l'embase est positive.Plug according to one of claims 6,7 or 11, characterized in that the transverse disc (34) of the valve body (32) is pierced in its center with an orifice (112), and in that the body of valve receives an axially movable shutter (104) which closes said orifice (112) when the pressure difference between the upper and lower portions of the base is positive. Bouchon selon la revendication précédente prise en combinaison avec la revendication 7, caractérisé en ce que l'obturateur (104) est monté mobile axialement à l'intérieure de ladite partie supérieure en forme de jupe (54) du pied central (45).Stopper according to the preceding claim taken in combination with claim 7, characterized in that the shutter (104) is mounted axially movable inside said upper skirt-shaped part (54) of the central leg (45). Bouchon selon la revendication 11, caractérisé en ce que la conduite (118, 124) s'étend radialement et est montée à rotation par rapport à une bague (20) de vissage du bouchon sur l'embase.Plug according to claim 11, characterized in that the pipe (118, 124) extends radially and is mounted for rotation relative to a ring (20) for screwing the plug onto the base.
EP19960402411 1995-11-15 1996-11-12 Cap for a cooling circuit of a motor vehicle Expired - Lifetime EP0774569B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9513619 1995-11-15
FR9513619A FR2741133B1 (en) 1995-11-15 1995-11-15 IMPROVED PLUG FOR A MOTOR VEHICLE COOLING CIRCUIT

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Publication Number Publication Date
EP0774569A1 true EP0774569A1 (en) 1997-05-21
EP0774569B1 EP0774569B1 (en) 2001-10-10

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EP19960402411 Expired - Lifetime EP0774569B1 (en) 1995-11-15 1996-11-12 Cap for a cooling circuit of a motor vehicle

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EP (1) EP0774569B1 (en)
DE (1) DE69615786T2 (en)
ES (1) ES2163601T3 (en)
FR (1) FR2741133B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2851786A1 (en) * 2003-02-27 2004-09-03 Itw Bailly Comte COOLING CIRCUIT FOR MOTOR VEHICLE, AND MOTOR VEHICLE THEREFOR

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US2203801A (en) 1936-11-12 1940-06-11 Eaton Mfg Co Closure device for sealed cooling systems
DE2143324A1 (en) * 1970-06-09 1973-03-08 Blau Kg Kraftfahrzeugtech CAP WITH AUTOMATIC PRESSURE COMPENSATION CONTROLLED BY VALVE PARTS
FR2410129A1 (en) * 1977-11-26 1979-06-22 Sueddeutsche Kuehler Behr Vehicle radiator filling cap - has valve plate working with sealing disc and acting as spring counter bearing
EP0518717A1 (en) * 1991-05-29 1992-12-16 Paul Journee S.A. Motor vehicle radiator cap

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203801A (en) 1936-11-12 1940-06-11 Eaton Mfg Co Closure device for sealed cooling systems
DE2143324A1 (en) * 1970-06-09 1973-03-08 Blau Kg Kraftfahrzeugtech CAP WITH AUTOMATIC PRESSURE COMPENSATION CONTROLLED BY VALVE PARTS
FR2410129A1 (en) * 1977-11-26 1979-06-22 Sueddeutsche Kuehler Behr Vehicle radiator filling cap - has valve plate working with sealing disc and acting as spring counter bearing
EP0518717A1 (en) * 1991-05-29 1992-12-16 Paul Journee S.A. Motor vehicle radiator cap

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2851786A1 (en) * 2003-02-27 2004-09-03 Itw Bailly Comte COOLING CIRCUIT FOR MOTOR VEHICLE, AND MOTOR VEHICLE THEREFOR
WO2004077916A2 (en) * 2003-02-27 2004-09-16 Itw Bailly Comte Cooling circuit for a motor vehicle and corresponding motor vehicle
WO2004077916A3 (en) * 2003-02-27 2004-10-14 Itw Bailly Comte Cooling circuit for a motor vehicle and corresponding motor vehicle
US7441517B2 (en) 2003-02-27 2008-10-28 Itw Bailly Comte Cooling circuit for a motor vehicle and corresponding motor vehicle

Also Published As

Publication number Publication date
DE69615786T2 (en) 2002-08-29
FR2741133A1 (en) 1997-05-16
DE69615786D1 (en) 2001-11-15
EP0774569B1 (en) 2001-10-10
FR2741133B1 (en) 1997-12-12
ES2163601T3 (en) 2002-02-01

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