EP0147330B1 - Membrane pump for the fuel supply of a vehicle engine. - Google Patents

Membrane pump for the fuel supply of a vehicle engine. Download PDF

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Publication number
EP0147330B1
EP0147330B1 EP84402717A EP84402717A EP0147330B1 EP 0147330 B1 EP0147330 B1 EP 0147330B1 EP 84402717 A EP84402717 A EP 84402717A EP 84402717 A EP84402717 A EP 84402717A EP 0147330 B1 EP0147330 B1 EP 0147330B1
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EP
European Patent Office
Prior art keywords
cylindrical
valve
delivery
holder
induction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84402717A
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German (de)
French (fr)
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EP0147330A1 (en
Inventor
Jean Marye
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Rivapompe SA
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Rivapompe SA
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Publication date
Application filed by Rivapompe SA filed Critical Rivapompe SA
Publication of EP0147330A1 publication Critical patent/EP0147330A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/046—Arrangements for driving diaphragm-type pumps

Definitions

  • the present invention relates to a diaphragm type pump, used in particular to supply petrol to the carburetor of a motor car engine.
  • a diaphragm pump of the type described in the classifying part of claim 1 is known.
  • a seal ensures the seal between the suction chamber and discharge chamber.
  • This seal is confined for this purpose in a narrow annular channel defined on the one hand, in the radial direction, between the walls opposite the projecting portion of the valve holder and the first body, and on the other hand, in the direction axial, between shoulders formed on the valve holder and on the first body.
  • the object of the present invention is to remedy these drawbacks by proposing a pump which can be produced in large series with large tolerances and therefore at a relatively low cost price, and which can be assembled automatically.
  • the pump according to the invention conforms to the characterizing part of claim 1.
  • the seal at the joint is not dependent on variations in the dimensions of the valve holder and of the first body, since the projecting part of the valve holder can always be more or less pressed inside the chamber d 'suction, and that the seal has all the space necessary to discharge axially.
  • the pump according to the invention is much more economical than that according to the cited prior art, since on the one hand, the first body is made in one piece for molding a thermoplastic material instead of being made of metal , and on the other hand, because any unnecessary loss of thermoplastic material due to excess thicknesses is avoided, in particular in the zone of tangency between the internal partition and the cylindrical wall of the first body, and finally because it can be manufactured in very large series. It is indeed possible to manufacture a single model of first body for all types of engines, the pipes being then welded to the inlet and outlet ports with the desired orientation, imposed by the particular type of engine.
  • the collar used according to patents US-A-3491 700 and FR-A-2 417 023 for assembling the first and second bodies is initially formed by a cylindrical ring of the same diameter as that of said bodies at their crimping rim, and the two edges of which are then folded inwards so that they pinch said crimping edges.
  • the tightening thus carried out can loosen, in particular in the case where the membrane decreases in thickness as a result of drying out or loss of elasticity due to fatigue. Fuel leaks can then occur at the joint between the two bodies.
  • the initially inclined branch of the flange would still continue to exert an elastic clamping action on said edges, and would make up for any play which would tend to form between the two bodies.
  • the fuel pump 10 essentially comprises an upper body 12 and a lower body 14, both made of a thermoplastic material of good mechanical resistance and having good resistance to the relatively high temperatures which prevail under the hood of the car.
  • the bodies 12 and 14 are constituted by substantially cylindrical containers, open at one end and the respective free edges of which are applied to one another, crushing between them the peripheral edge of a deformable membrane 16, for example made of rubber , and the peripheral edge of a rigid valve holder 18. To this end, the two bodies are secured by means of an annular flange 20 of elastic sheet, which is crimped on annular flanges 22, 24, formed respectively on said edges of the bodies.
  • the flange initially has a section with three branches, the upper branch 26 which is intended to be applied against the horizontal shoulder 28 of the flange 22 of the upper body, is inclined internally from the horizontal by a small angle a.
  • this branch deforms elastically to apply to the shoulder 28 by exerting on the flanges 22, 24 and therefore on the edges of the membrane 16 and of the valve holder 18 an elastic tightening which guarantees a perfect seal between the two bodies.
  • the upper body 12 is divided internally by a substantially cylindrical partition 30 tangentially connecting to the wall of the body 12, in a suction chamber 32 inside said partition and in a discharge chamber 34 outside said partition.
  • the discharge chamber internally has partial partitions, which, drawn in an appropriate manner, make it possible to isolate volumes which act as a damper promoting the flow rates.
  • the valve holder 18 includes a portion which fits into the opening of the suction chamber 32, an O-ring 36 ensuring sealing. Said valve holder portion as well as the remaining portion which is opposite the delivery chamber are respectively provided with orifices, closed in a manner known per se, by valves 38, 40 loaded by springs 41. Upstream of the suction valve 38 is mounted a screen 43 for filtering the gasoline arriving from the tank.
  • the upper body 12 has, on its bottom wall, two orifices 42 and 44, which open respectively into the suction chamber 32 and into the discharge chamber 34.
  • an adjustable suction pipe 46 connected to the vehicle's fuel tank and an adjustable delivery pipe 48 connected to the carburetor.
  • these pipes are welded at the time of assembly, with the orientation desired by the user.
  • the upper body also has in its cylindrical wall an orifice 50 which opens into the delivery chamber and on which is fixed a tube 52 intended to bring the fuel back to the tank in the event of the car.
  • the central portion of the membrane 16 is sandwiched between a support flange 54 and a counter plate 56 to which it is secured by means of a rivet 58.
  • the flange carries an L-shaped arm 60 connected by a free-running link to the 'upper end of a pusher 62 which extends along the axis of the lower body 14.
  • the pusher projects outside the lower body through an orifice formed in the bottom of the latter, a seal 64 ensuring the sealing at this orifice.
  • the membrane-flange and counter-plate assembly is normally biased upwards in FIG. 1 by a compression spring 66 resting on the flange 54 and on the bottom of the lower body.
  • the pusher 62 can be pressed inside the lower body, against the force of a spring 68 of greater hardness than that of the spring 66.
  • the pusher can be actuated either by the eccentric of a motor shaft , or by a tilting lever.
  • the pump is in the state shown in FIG. 1: the pusher 62 is brought into its low position by the return spring 68; the stop 70 of the pusher resting on the arm 60 lowers the assembly of the membrane 16, of the support flange 54 and of the counterplate 56.
  • the cam pushes the pusher, said movable assembly being released, it is pushed upwards in FIG. 1 by the prestressed spring 66.
  • the gasoline which is in the chamber 72 defined between the membrane 16 and the valve holder 18 is discharged through the valve 40 and the manifold. discharge 48 to the carburetor. r.
  • the pump according to the invention is much more efficient, lighter, more economical than the best diaphragm pumps currently known on the market.
  • it can be manufactured fully automatically in large series, since only one model has to be manufactured, the pipes being welded at the time of assembly, with the desired orientation.
  • the pump shown in FIG. 5 differs from that of FIG. 1 only in that the pusher 62 is directly fixed to the membrane 16, flange 54 and counter plate 56 assembly and that the pusher is actuated by a lever. tilting 76.
  • the latter is pivotally mounted about an axis 78 and is urged to bear against a cam 80 of a drive shaft by a spring 82.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)

Description

La présente invention concerne une pompe du type à membrane, servant notamment à alimenter en essence le carburateur d'un moteur de voiture automobile.The present invention relates to a diaphragm type pump, used in particular to supply petrol to the carburetor of a motor car engine.

Par les brevets US-A-3 491 700 et FR-A-2417 023, on connaît une pompe à membrane du type décrit dans la partie classifiante de la revendication 1. Dans ce type de pompe, un joint assure l'étanchéité entre la chambre d'aspiration et la chambre de refoulement. Ce joint est confiné à cet effet dans un étroit canal annulaire défini d'une part, dans le sens radial, entre les parois en regard de la portion saillante du porte-clapets et du premier corps, et d'autre part, dans le sens axial, entre des épaulements formés sur le porte-clapets et sur le premier corps. On est donc tenu de fabriquer ces deux pièces avec des tolérances extrêmement serrées pour éviter que le canal soit surdimensionné et que le joint assure imparfaitement sa fonction d'étanchéité, ou au contraire sous-dimensionné et que le joint tende alors à s'épancher dans le sens axial et à empêcher de ce fait le bord périphérique du porte-clapets de s'appuyer sur le bord du premier corps. Les tolérances de fabrication du porte-clapets et du premier corps peuvent se cumuler surtout lorsque, comme c'est le plus souvent le cas, ces pièces sont fabriquées en grande série et que le fabricant de pompes s'approvisionne chez différents fournisseurs.From patents US-A-3,491,700 and FR-A-2,417,023, a diaphragm pump of the type described in the classifying part of claim 1 is known. In this type of pump, a seal ensures the seal between the suction chamber and discharge chamber. This seal is confined for this purpose in a narrow annular channel defined on the one hand, in the radial direction, between the walls opposite the projecting portion of the valve holder and the first body, and on the other hand, in the direction axial, between shoulders formed on the valve holder and on the first body. We are therefore required to manufacture these two parts with extremely tight tolerances to avoid that the channel is oversized and that the seal imperfectly performs its sealing function, or on the contrary undersized and that the seal then tends to pour out in the axial direction and thereby preventing the peripheral edge of the valve holder from pressing against the edge of the first body. The manufacturing tolerances of the valve holder and the first body can accumulate, especially when, as is most often the case, these parts are mass produced and the pump manufacturer sources from different suppliers.

La présente invention a pour but de remédier à ces inconvénients en proposant une pompe qui peut être fabriquée en grande série avec de larges tolérances et donc à un prix de revient relativement bas, et qui peut être assemblée automatiquement.The object of the present invention is to remedy these drawbacks by proposing a pump which can be produced in large series with large tolerances and therefore at a relatively low cost price, and which can be assembled automatically.

A cet effet, la pompe selon l'invention est conforme à la partie caractérisante de la revendication 1.To this end, the pump according to the invention conforms to the characterizing part of claim 1.

Ainsi, l'étanchéité au niveau du joint n'est pas tributaire des variations des cotes du porte-clapets et du premier corps, puisque la partie saillante du porte-clapets peut toujours être plus ou moins enfoncée à l'intérieur de la chambre d'aspiration, et que le joint a toute la place nécessaire pour s'épancher axialement.Thus, the seal at the joint is not dependent on variations in the dimensions of the valve holder and of the first body, since the projecting part of the valve holder can always be more or less pressed inside the chamber d 'suction, and that the seal has all the space necessary to discharge axially.

De plus, la pompe selon l'invention est bien plus économique que celle selon la technique antérieure citée, puisque d'une part, le premier corps est réalisé en une seule pièce pour moulage d'une matière thermoplastique au lieu d'être en métal, et d'autre part, parce que l'on évite toute perte inutile de matière thermoplastique due à des surépaisseurs, notamment dans la zone de tangence entre la cloison intérieure et la paroi cylindrique du premier corps, et enfin parce qu'elle peut être fabriquée en très grande série. On peut en effet fabriquer un seul modèle de premier corps pour tous les types de moteurs, les tubulures étant ensuite soudées sur les orifices d'admission et de refoulement avec l'orientation voulue, imposée par le type de moteur particulierIn addition, the pump according to the invention is much more economical than that according to the cited prior art, since on the one hand, the first body is made in one piece for molding a thermoplastic material instead of being made of metal , and on the other hand, because any unnecessary loss of thermoplastic material due to excess thicknesses is avoided, in particular in the zone of tangency between the internal partition and the cylindrical wall of the first body, and finally because it can be manufactured in very large series. It is indeed possible to manufacture a single model of first body for all types of engines, the pipes being then welded to the inlet and outlet ports with the desired orientation, imposed by the particular type of engine.

sur lequel la pompe est montée.on which the pump is mounted.

La collerette utilisée selon les brevets US-A-3491 700 et FR-A-2 417 023 pour assembler les premier et second corps est constituée initialement par une bague cylindrique de même diamètre que celui desdits corps au niveau de leur rebord de sertissage, et dont on rabat ensuite les deux bords vers l'intérieur de manière qu'ils viennent pincer lesdits rebords de sertissage.The collar used according to patents US-A-3491 700 and FR-A-2 417 023 for assembling the first and second bodies is initially formed by a cylindrical ring of the same diameter as that of said bodies at their crimping rim, and the two edges of which are then folded inwards so that they pinch said crimping edges.

Toutefois, le serrage ainsi effectué peut se relâcher, notamment dans le cas où la membrane diminue d'épaisseur par suite de dessèchement ou de perte d'élasticité due à la fatigue. Des fuites de carburant peuvent alors se produire à la jointure entre les deux corps.However, the tightening thus carried out can loosen, in particular in the case where the membrane decreases in thickness as a result of drying out or loss of elasticity due to fatigue. Fuel leaks can then occur at the joint between the two bodies.

On remédie à cet inconvénient selon l'invention, grâce à la caractéristique faisant l'objet de la revendication 2.This drawback is remedied according to the invention, thanks to the characteristic which is the subject of claim 2.

Ainsi, si la membrane diminuait d'épaisseur, la branche initialement inclinée de la collerette continuerait encore à exercer une action de serrage élastique sur lesdits rebords, et rattraperait tout jeu qui aurait tendance à se former entre les deux corps.Thus, if the membrane decreased in thickness, the initially inclined branch of the flange would still continue to exert an elastic clamping action on said edges, and would make up for any play which would tend to form between the two bodies.

Deux modes de réalisation préférés de l'invention seront à présent décrits en regard des dessins annexés dans lesquels :

  • La figure 1 est une vue en coupe axiale de la pompe à membrane selon un premier mode de réalisation de l'invention ;
  • La figure 2 est une vue de dessus de la pompe de la figure 1 ;
  • La figure 3 est une vue en plan du corps supérieur, vide des éléments qu'il convient ;
  • La figure 4 montre une section radiale de la collerette avant son sertissage, et
  • La figure 5 montre une vue en coupe axiale d'un autre modèle de pompe à membrane commandée par levier basculant.
Two preferred embodiments of the invention will now be described with reference to the accompanying drawings in which:
  • Figure 1 is an axial sectional view of the diaphragm pump according to a first embodiment of the invention;
  • Figure 2 is a top view of the pump of Figure 1;
  • Figure 3 is a plan view of the upper body, empty of the appropriate elements;
  • FIG. 4 shows a radial section of the flange before it is crimped, and
  • Figure 5 shows an axial sectional view of another model of diaphragm pump controlled by tilting lever.

Avec référence de la figure 1, la pompe à essence 10 comprend essentiellement un corps supérieur 12 et un corps inférieur 14, tous deux réalisés en une matière thermoplastique de bonne résistance mécanique et ayant une bonne tenue aux températures relativement élevées qui règnent sous le capot de la voiture.With reference to FIG. 1, the fuel pump 10 essentially comprises an upper body 12 and a lower body 14, both made of a thermoplastic material of good mechanical resistance and having good resistance to the relatively high temperatures which prevail under the hood of the car.

Les corps 12 et 14 sont constitués par des récipients sensiblement cylindriques, ouverts à une extrémité et dont les bords libres respectifs sont appliqués l'un sur l'autre en écrasant entre eux le bord périphérique d'une membrane déformable 16, par exemple en caoutchouc, et le bord périphérique d'un porte-clapets 18 rigide. A cet effet, les deux corps sont solidarisés au moyen d'une collerette annulaire 20 en tôle élastique, qui est sertie sur des brides annulaires 22, 24, formées respectivement sur lesdits bords des corps.The bodies 12 and 14 are constituted by substantially cylindrical containers, open at one end and the respective free edges of which are applied to one another, crushing between them the peripheral edge of a deformable membrane 16, for example made of rubber , and the peripheral edge of a rigid valve holder 18. To this end, the two bodies are secured by means of an annular flange 20 of elastic sheet, which is crimped on annular flanges 22, 24, formed respectively on said edges of the bodies.

Comme le montre la figure 4, la collerette a initialement une section à trois branches, dont la branche supérieure 26 qui est destinée à s'appliquer contre l'épaulement horizontal 28 de la bride 22 du corps supérieur, est inclinée intérieurement par rapport à l'horizontale d'un faible angle a. Lors du sertissage, cette branche se déforme élastiquement pour s'appliquer sur l'épaulement 28 en exerçant sur les brides 22, 24 et donc sur les bords de la membrane 16 et du porte-clapets 18 un serrage élastique qui garantit une parfaite étanchéité entre les deux corps.As shown in Figure 4, the flange initially has a section with three branches, the upper branch 26 which is intended to be applied against the horizontal shoulder 28 of the flange 22 of the upper body, is inclined internally from the horizontal by a small angle a. During crimping, this branch deforms elastically to apply to the shoulder 28 by exerting on the flanges 22, 24 and therefore on the edges of the membrane 16 and of the valve holder 18 an elastic tightening which guarantees a perfect seal between the two bodies.

Le corps supérieur 12 est divisé intérieurement par une cloison sensiblement cyclindrique 30 se raccordant tangentiellement à la paroi du corps 12, en une chambre d'aspiration 32 intérieure à ladite cloison et en une chambre de refoulement 34 extérieure à ladite cloison. La chambre de refoulement comporte intérieurement des cloisons partielles, qui, dessinées d'une manière appropriée, permettent d'isoler des volumes qui jouent le rôle d'amortisseur favorisant les débits.The upper body 12 is divided internally by a substantially cylindrical partition 30 tangentially connecting to the wall of the body 12, in a suction chamber 32 inside said partition and in a discharge chamber 34 outside said partition. The discharge chamber internally has partial partitions, which, drawn in an appropriate manner, make it possible to isolate volumes which act as a damper promoting the flow rates.

Le porte-clapets 18 comprend une portion qui s'adapte dans l'ouverture de la chambre d'aspiration 32, un joint torique 36 assurant l'étanchéité. Ladite portion de porte-clapets ainsi que la portion restante qui se trouve en regard de la chambre de refoulement sont pourvues respectivement d'orifices, obturés de façon connue en soi, par des clapets 38, 40 chargés par des ressorts 41. En amont du clapet 38 d'aspiration est monté un tamis 43 destiné à filtrer l'essence arrivant du réservoir.The valve holder 18 includes a portion which fits into the opening of the suction chamber 32, an O-ring 36 ensuring sealing. Said valve holder portion as well as the remaining portion which is opposite the delivery chamber are respectively provided with orifices, closed in a manner known per se, by valves 38, 40 loaded by springs 41. Upstream of the suction valve 38 is mounted a screen 43 for filtering the gasoline arriving from the tank.

Le corps supérieur 12 présente, sur sa paroi de fond, deux orifices 42 et 44, qui débouchent respectivement dans la chambre d'aspiration 32 et dans la chambre de refoulement 34.The upper body 12 has, on its bottom wall, two orifices 42 and 44, which open respectively into the suction chamber 32 and into the discharge chamber 34.

Conformément à l'invention, sur ces deux orifices sont respectivement fixées, par exemple par soudure par ultrasons, une tubulure d'aspiration orientable 46 reliée au réservoir d'essence du véhicule et une tubulure de refoulement orientable 48 reliée au carburateur. Comme on l'a déjà précisé, ces tubulures sont soudées au moment de l'assemblage, avec l'orientation souhaitée par l'utilisateur.According to the invention, on these two orifices are respectively fixed, for example by ultrasonic welding, an adjustable suction pipe 46 connected to the vehicle's fuel tank and an adjustable delivery pipe 48 connected to the carburetor. As already specified, these pipes are welded at the time of assembly, with the orientation desired by the user.

Comme le montre la figure 2, le corps supérieur présente également dans sa paroi cylindrique un orifice 50 qui débouche dans la chambre de refoulement et sur lequel est fixée une tubulure 52 destinée à ramener l'essence vers le réservoir en cas d'arrêt de la voiture.As shown in Figure 2, the upper body also has in its cylindrical wall an orifice 50 which opens into the delivery chamber and on which is fixed a tube 52 intended to bring the fuel back to the tank in the event of the car.

La portion centrale de la membrane 16 est enserrée entre un flasque-support 54 et une contre-plaque 56 auxquels elle est solidarisée au moyen d'un rivet 58. Le flasque porte un bras 60 en L relié par une liaison à course libre à l'extrémité supérieure d'un poussoir 62 qui s'étend selon l'axe du corps inférieur 14. Le poussoir fait saillie à l'extérieur du corps inférieur à travers un orifice formé dans le fond de ce dernier, un joint 64 assurant l'étanchéité au niveau de cet orifice.The central portion of the membrane 16 is sandwiched between a support flange 54 and a counter plate 56 to which it is secured by means of a rivet 58. The flange carries an L-shaped arm 60 connected by a free-running link to the 'upper end of a pusher 62 which extends along the axis of the lower body 14. The pusher projects outside the lower body through an orifice formed in the bottom of the latter, a seal 64 ensuring the sealing at this orifice.

L'ensemble membrane-flasque et contre-plaque est normalement sollicité vers le haut sur la figure 1 par un ressort de compression 66 s'appuyant sur le flasque 54 et sur le fond du corps inférieur.The membrane-flange and counter-plate assembly is normally biased upwards in FIG. 1 by a compression spring 66 resting on the flange 54 and on the bottom of the lower body.

Le poussoir 62 peut être enfoncé à l'intérieur du corps inférieur, à l'encontre de la force d'un ressort 68 de dureté supérieure à celle du ressort 66. Le poussoir peut être actionné soit par l'excentrique d'un arbre moteur, soit par un levier basculant.The pusher 62 can be pressed inside the lower body, against the force of a spring 68 of greater hardness than that of the spring 66. The pusher can be actuated either by the eccentric of a motor shaft , or by a tilting lever.

Initialement, la pompe est dans l'état représenté sur la figure 1 : le poussoir 62 est amené dans sa position basse par le ressort de rappel 68 ; la butée 70 du poussoir s'appuyant sur le bras 60 fait descendre l'ensemble de la membrane 16, du flasque-support 54 et de la contre-plaque 56. Lorsque la came enfonce le poussoir, ledit ensemble mobile étant libéré, il est repoussé vers le haut sur la figure 1 par le ressort précontraint 66. Dans ce mouvement, l'essence qui se trouve dans la chambre 72 définie entre la membrane 16 et le porte-clapets 18 est refoulée à travers le clapet 40 et la tubulure de refoulement 48 vers le carburateur. r.Initially, the pump is in the state shown in FIG. 1: the pusher 62 is brought into its low position by the return spring 68; the stop 70 of the pusher resting on the arm 60 lowers the assembly of the membrane 16, of the support flange 54 and of the counterplate 56. When the cam pushes the pusher, said movable assembly being released, it is pushed upwards in FIG. 1 by the prestressed spring 66. In this movement, the gasoline which is in the chamber 72 defined between the membrane 16 and the valve holder 18 is discharged through the valve 40 and the manifold. discharge 48 to the carburetor. r.

Lorsque la came s'efface, le poussoir 62 est rappelé par le ressort 68 vers sa position basse. Le poussoir fait alors descendre la membrane, de sorte que de l'essence est aspirée depuis le réservoir à travers la tubulure d'aspiration 46, le tamis 43 et le clapet 38. Le cycle se reproduit de la même façon à chaque révolution de la came.When the cam disappears, the pusher 62 is returned by the spring 68 to its low position. The pusher then lowers the membrane, so that gasoline is sucked from the tank through the suction pipe 46, the screen 43 and the valve 38. The cycle is repeated in the same way with each revolution of the cam.

En raison de ses nombreuses qualités signalées précédemment, la pompe selon l'invention est bien plus performante, plus légère, plus économique que les meilleures pompes à membrane actuellement connues sur le marché. De plus, elle peut être fabriquée de façon entièrement automatique en grande série, puisqu'il ne faut en fabriquer qu'un unique modèle, les tubulures étant soudées au moment de l'assemblage, avec l'orientation voulue.Because of its many qualities mentioned above, the pump according to the invention is much more efficient, lighter, more economical than the best diaphragm pumps currently known on the market. In addition, it can be manufactured fully automatically in large series, since only one model has to be manufactured, the pipes being welded at the time of assembly, with the desired orientation.

La pompe représentée sur la figure 5 ne se distingue de celle de la figure 1 que par le fait que le poussoir 62 est directement fixé à l'ensemble membrane 16, flasque 54 et contre-plaque 56 et que le poussoir est actionné par un levier basculant 76. Ce dernier est monté pivotant autour d'un axe 78 et est sollicité en appui contre une came 80 d'un arbre moteur par un ressort 82.The pump shown in FIG. 5 differs from that of FIG. 1 only in that the pusher 62 is directly fixed to the membrane 16, flange 54 and counter plate 56 assembly and that the pusher is actuated by a lever. tilting 76. The latter is pivotally mounted about an axis 78 and is urged to bear against a cam 80 of a drive shaft by a spring 82.

Claims (4)

1. Diaphragm pump for supplying petrol to a motor vehicle engine, of the type comprising :
a first cylindrical body 12 closed at one end by a base which has an induction orifice (42) and a delivery orifice (44), the said body being divided internally by a cylindrical partition (30) attached to the said base and defining within it an induction chamber (32) and outside it a delivery chamber (34) into which the said induction and delivery orifices open respectively
a second body (14) in the form of a cup, the said bodies (12, 14) being provided at their open ends with seating flanges (22, 24) ;
a circular, deformable diaphragm (16) ;
a circular valve-holder (18) which is provided with an induction valve (38) and a delivery valve (40) and which has a projecting tubular portion ; and
an elastic collar (20) which clamps the said flanges (22, 24) onto the peripheral edges of the diaphragm and of the valve-holder, the said projecting tubular portion of the valve-holder making a sealed fit within the said cylindrical partition, characterised in that the said cylindrical partition (30) comprises a first cylindrical portion adjacent to the base of the first body and the wall of which blends with the cylindrical wall of the said first body without forming an extra thickness at their common tangent, and the said cylindrical portion being extended by a second coaxial cylindrical portion, with an internal diameter greater than that of the first cylindrical portion, in that the projecting tubular portion of the valve-holder penetrates the said second cylindrical portion of the partition to define with the inside wall of the latter an annular gap in which is fitted an O-ring (36) of such dimensions that it occupies only a fraction of the height of the second cylindrical portion of the partition and of the tubular portion of the valve-holder, in that the said first body is formed in one piece by moulding a thermoplastic material and in that the induction (42) and delivery (44) orifices are provided with nipples (46, 48) welded to the said orifices.
2. Diaphragm pump in accordance with claim 1, characterised in that the annular collar (20) has three branches in section, the two end branches of which are applied respectively to the seating flanges (22, 24), one (26) of the end branches being inclined before being set in position by a small angle (a) beyond the position which it normally occupies when it is applied to the corresponding flange (22), so that after being set in position it applies with the other end branch elastic clamping to the said flanges.
3. Diaphragm pump in accordance with claim 1, characterised in that the said first body includes on its cylindrical side wall a third orifice (50) which opens into the delivery chamber (34) and to which is fixed a nipple (52) to return petrol to the tank.
4. Diaphragm pump in accordance with claim 1, characterised in that the delivery chamber (34) has partial partitions for isolation of volumes which act as dampers to facilitate delivery.
EP84402717A 1983-12-28 1984-12-26 Membrane pump for the fuel supply of a vehicle engine. Expired EP0147330B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320928 1983-12-28
FR8320928A FR2557639B1 (en) 1983-12-28 1983-12-28 MEMBRANE PUMP FOR FUELING A MOTOR VEHICLE ENGINE AND ASSEMBLY METHOD THEREOF

Publications (2)

Publication Number Publication Date
EP0147330A1 EP0147330A1 (en) 1985-07-03
EP0147330B1 true EP0147330B1 (en) 1988-08-17

Family

ID=9295652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402717A Expired EP0147330B1 (en) 1983-12-28 1984-12-26 Membrane pump for the fuel supply of a vehicle engine.

Country Status (5)

Country Link
EP (1) EP0147330B1 (en)
DE (1) DE3473493D1 (en)
ES (1) ES8605614A1 (en)
FR (1) FR2557639B1 (en)
PT (1) PT79753A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2623253B1 (en) * 1987-11-13 1990-04-13 Hunsinger Emile FUEL SUPPLY PUMP FOR A HEAT ENGINE AND MANUFACTURING METHOD THEREOF
FR2608218B1 (en) * 1986-12-16 1989-04-07 Hunsinger Emile MEMBRANE PUMP FOR FUELING A MOTOR VEHICLE ENGINE AND MANUFACTURING METHOD THEREOF
ES2018567B3 (en) * 1986-12-16 1991-04-16 Emile Hunsinger PUMP WITH MEMBRANE FOR THE FEED IN FUEL OF A THERMAL ENGINE AND ITS MANUFACTURING PROCESS
FR2722539B1 (en) 1994-07-12 1996-08-23 Rivapompe Sa MECHANICAL PUMP WITH INCREASED PRESSURE MEMBRANE FOR FUEL SUPPLY OF THERMAL ENGINES, IN PARTICULAR OF INJECTION ENGINE
WO1997030283A1 (en) * 1996-02-14 1997-08-21 Mikuni Adec Corporation Diaphragm-holding synthetic resin assembly
KR101605718B1 (en) * 2014-07-31 2016-03-24 세메스 주식회사 Liquid supplying unit and Apparatus for treating substrate with the unit

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1121507A (en) * 1952-10-29 1956-08-20 Carter Carburetor Corp Fuel pump
US3252424A (en) * 1960-01-15 1966-05-24 Acf Ind Inc Fuel systems
US3198128A (en) * 1961-07-05 1965-08-03 Acf Ind Inc Mechanical pump
US3179055A (en) * 1962-08-31 1965-04-20 Acf Ind Inc Fuel pump
US3491700A (en) * 1967-03-21 1970-01-27 Airtex Prod Fuel pump
DE2159306B2 (en) * 1970-12-17 1978-09-21 Iao Industrie Riunite S.P.A., Turin (Italien) Diaphragm fuel pump for endothermic machines
GB1476898A (en) * 1975-05-05 1977-06-16 Gen Motors France Diaphragm pumps
JPS53106908A (en) * 1977-02-28 1978-09-18 Kyosan Denki Kk Mechanical fuel pump for internal combustion engine
DE2901981A1 (en) * 1978-02-09 1979-08-16 Iao Industrie Riunite Spa DIAPHRAGM PUMP FOR FUEL SUPPLY, IN PARTICULAR FOR COMBUSTION MACHINERY
FR2425555A1 (en) * 1978-05-08 1979-12-07 Pn Sas Negro Et Co Membrane fuel pump for IC engine - has inlet and discharge chambers forming air pockets to reduce pressure fluctuations
BR8004133A (en) * 1979-10-01 1981-04-22 Acf Ind Inc FUEL PUMP
FR2512888A1 (en) * 1981-06-09 1983-03-18 Siette Spa Automobile brake servo pump and oil pump - are assembled with common drive mechanism using crank shaft and rocker
IT8222121V0 (en) * 1982-06-08 1982-06-08 Siette Spa DIAPHRAGM PUMP, ESPECIALLY FOR FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE.

Also Published As

Publication number Publication date
EP0147330A1 (en) 1985-07-03
ES8605614A1 (en) 1986-03-16
FR2557639B1 (en) 1988-06-24
DE3473493D1 (en) 1988-09-22
ES539094A0 (en) 1986-03-16
FR2557639A1 (en) 1985-07-05
PT79753A (en) 1985-01-01

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