EP1431524A1 - Pump arrangement for a combustion engine - Google Patents

Pump arrangement for a combustion engine Download PDF

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Publication number
EP1431524A1
EP1431524A1 EP03293206A EP03293206A EP1431524A1 EP 1431524 A1 EP1431524 A1 EP 1431524A1 EP 03293206 A EP03293206 A EP 03293206A EP 03293206 A EP03293206 A EP 03293206A EP 1431524 A1 EP1431524 A1 EP 1431524A1
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EP
European Patent Office
Prior art keywords
camshaft
stator
rotor
pump
cylinder head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03293206A
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German (de)
French (fr)
Inventor
Bernard Pitaud
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1431524A1 publication Critical patent/EP1431524A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/06—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0253—Pressure lubrication using lubricating pumps characterised by the pump driving means
    • F01M2001/0261—Pressure lubrication using lubricating pumps characterised by the pump driving means driven by the camshaft

Definitions

  • the invention relates to an arrangement of a pump on an internal combustion engine.
  • the invention relates more particularly to an arrangement of a pump on an internal combustion engine, the pump being intended to supply a determined pressure to a fluid contained in a circuit.
  • motor vehicles can include consumers connected to at least one circuit in which circulates, for example, a fluid having a positive pressure or negative.
  • the automotive vehicles include circuits powered by rotary pumps driven by a rotating axis, such as a camshaft in the case of internal combustion engines.
  • vacuum pump generally includes a rotor, a stator and at minus a free pallet sliding in a groove of the rotor.
  • the axis of rotation of the rotor can be mounted eccentric relative to an axis of symmetry of the stator of the pump.
  • the rotor rotation movement is traditionally transmitted by the camshaft of the internal combustion engine, via a Oldham joint type coupling means, for example.
  • An object of the present invention is to provide a arrangement of a pump on an internal combustion engine, the engine comprising a cylinder head containing at least one shaft with rotary cam, the pump comprising a stator, a rotor linked in rotation with the camshaft and a means of suction and discharge of a fluid in a circuit capable of being actuated by the rotor, overcoming all or part of the drawbacks of art earlier noted above.
  • the arrangement according to the invention is essentially characterized in that at least part of the rotor is formed by one end of the shaft with cams.
  • the end of the camshaft makes advantageously protruding from the cylinder head of the engine, so that the pump stator is mounted on the end of the shaft to cams, the stator being fixed to the cylinder head.
  • the stator is fixed to the cylinder head by means of fastening means of the clamping screw type cooperating with machined bores in the cylinder head of the engine.
  • the invention comprises an annular seal interposed between the stator of the pump and the cylinder head of the engine to ensure a quality seal.
  • the invention comprises a pump integrated in a circuit, the pornpe being a vacuum pump and the circuit being a vacuum circuit connected to a braking device of a vehicle.
  • a fluid circuit 7 complementary to circuit 70 main brake, in which a fluid circulates.
  • This circuit 7 complementary contains a negative pressure fluid, that is to say in depression, in order to assist the support on a brake pedal 80 for braking assistance.
  • Circuit 7 can include at least one branch 71 allowing, if necessary, to feed at least one other consumer 72 empty.
  • the vacuum pump 1, supplying the circuit 7, is positioned on a cylinder head 3 of a combustion engine 2 internal.
  • the cylinder head 3 of the engine 2 incorporates at least one shaft 4 cam for rotating a rotor 5 of the pump 1, visible in particular in FIG. 2.
  • the vacuum pump 1 comprises a stator 6, a rotor 5 and a means 9 for suction and discharge.
  • the stator 6 is of substantially cylindrical shape and defines in its interior volume V a surface S substantially cylindrical.
  • the means 9 for suction and delivery includes a pallet 9 of substantially rectangular shape (see FIG. 2 and 4).
  • the rotor 5 comprises at least one groove 8 in which the pallet 9 is housed.
  • the pallet 9 is therefore linked in rotor rotation 5.
  • the rotor 5 and the pallet 9 are thus mounted in this interior volume V so that the axis A2 of symmetry longitudinal of stator 6 is offset from axis A1 of rotation of rotor 5 (See FIG. 3).
  • the stator 6 comprises at least one input 11 and at least an output 12.
  • Input 11 being connected to circuit 7 in which the fluid circulates under vacuum, is preferably located on the periphery of stator 6, that is to say on a cylindrical wall of the stator 6.
  • the outlet 12 is, in turn, a machined opening through the cylinder head 3 and opening in the interior volume V of the stator 6.
  • Pallet 9 has dimensions corresponding to the diameter inside of the stator 6.
  • one end 5 of the camshaft 4 constitutes the rotor of the pump 1.
  • this end 5 of the camshaft 4 cooperates directly with the pallet 9 in order to generate the suction and discharge of fluid circulating in circuit 7.
  • the end 5 of the camshaft 4 projects out of the cylinder head 3, through a passage 16 provided for this purpose and visible in Figure 4.
  • the camshaft 4 therefore has a length chosen higher than that of the cylinder head 3.
  • the stator 6 of the pump 1 is then directly mounted around the end 5 from the camshaft 4.
  • the cylinder head 3 consists of 2 parts, an upper part 3a and a lower part 3b (see FIG. 4).
  • the two parts 3a and 3b of the cylinder head each have an opening 16a, 16b, which are substantially semi-circular in shape.
  • the two openings 16a and 16b describe a passage 16 of shape cylindrical through the cylinder head 3.
  • the passage 16 forms a landing for the camshaft 4. This helps to remove misalignment issues from the camshaft 4. So, this better alignment of the shaft 4 to cams reduces the operating noise of the vacuum generation function, by comparison with prior art devices.
  • the end 5 of the camshaft 4 has a diameter greater than the diameter of the rest of camshaft 4.
  • the seal between the end 5 of the camshaft 4 and the cylinder head 3 is preferably ensured without adding an additional sealing element.
  • an additional sealing element could, for example, be disposed at the opening 16 of the cylinder head 3.
  • the side of the stator 6 bearing on the cylinder head 3 has a seal 13 annular, of the elastomer O-ring type for example.
  • the gasket 13 is placed in a housing 17 of revolution formed in stator 6.
  • the annular seal 13 undergoes deformation during mounting the stator 6 on the cylinder head 3.
  • the gasket 13 is then taken sandwiched between the stator body 6 and the cylinder head 3. This deformation, guaranteeing a perfect seal, is maintained by the means 14 for attaching the stator 6 to the cylinder head 3.
  • These means for attaching the stator 6 to the cylinder head 3 are consist, for example, of at least two clamping screws 14 cooperating with threaded bores 15 formed in the cylinder head 3 (See FIG. 2 to 4).
  • the invention advantageously solves the problems space present in the prior art. Indeed, the invention overcomes a mounting flange traditionally interposed between the stator 6 and the cylinder head 3. It is therefore easy to see that the invention allows a reduction significant size associated with the generation function of empty.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The i.c. engine (2) comprises a cylinder head (3) containing a rotating camshaft (4). The pump (1) comprises a stator (6) and a rotor (5) connected to rotate with the camshaft and a fluid suction and flow back means in a circuit (7) able to be activated by the rotor. A part of the rotor is constituted by one end of the camshaft.

Description

L'invention se rapporte à un agencement d'une pompe sur un moteur à combustion interne.The invention relates to an arrangement of a pump on an internal combustion engine.

L'invention concerne plus particulièrement un agencement d'une pompe sur un moteur à combustion interne, la pompe étant destinée à fournir une pression déterminée à un fluide contenu dans un circuit.The invention relates more particularly to an arrangement of a pump on an internal combustion engine, the pump being intended to supply a determined pressure to a fluid contained in a circuit.

Afin d'assurer le fonctionnement de certains dispositifs présents dans un véhicule automobile, il est nécessaire de leur fournir une énergie. Par conséquent, il est d'usage de nommer ces dispositifs des « consommateurs ».To ensure the operation of certain devices present in a motor vehicle, it is necessary to provide energy. Therefore, it is customary to name these "consumer" devices.

Ainsi, les véhicules automobiles peuvent comporter des consommateurs reliés à au moins un circuit dans lequel circule, par exemple, un fluide ayant une pression positive ou négative. Afin de subvenir à des besoins en pression, les véhicules automobies comprennent des circuits alimentés par des pompes rotatives entraínées par un axe tournant, tel un arbre à cames dans le cas des moteurs à combustion interne.Thus, motor vehicles can include consumers connected to at least one circuit in which circulates, for example, a fluid having a positive pressure or negative. In order to meet pressure requirements, the automotive vehicles include circuits powered by rotary pumps driven by a rotating axis, such as a camshaft in the case of internal combustion engines.

Il est donc connu des pompes destinées à générer une dépression pour des systèmes de servofrein et/ou pour d'autres systèmes consommateurs de vide dans les véhicules automobiles. Ce type de pompe, habituellement nommée pompe à vide, comporte généralement un rotor, un stator et au moins une palette libre en coulissement dans une rainure du rotor. L'axe de rotation du rotor peut être monté excentrique par rapport à un axe de symétrie du stator de la pompe. Le mouvement de rotation du rotor est traditionnellement transmis par l'arbre à cames du moteur à combustion interne, via un moyen d'accouplement du type joint d'Oldham, par exemple. It is therefore known to pumps intended to generate a vacuum for brake booster systems and / or for other vacuum systems in vehicles automobiles. This type of pump, usually named vacuum pump, generally includes a rotor, a stator and at minus a free pallet sliding in a groove of the rotor. The axis of rotation of the rotor can be mounted eccentric relative to an axis of symmetry of the stator of the pump. The rotor rotation movement is traditionally transmitted by the camshaft of the internal combustion engine, via a Oldham joint type coupling means, for example.

La demanderesse a constaté que l'utilisation de ce type de pompe dans un moteur à combustion interne engendre certains cas de rupture du moyen d'accouplement. En particulier, on a constaté que le fonctionnement acyclique du moteur génère une usure par fatigue du moyen d'accouplement.The Applicant has found that the use of this type pump in an internal combustion engine generates certain cases of rupture of the coupling means. In particular, it was found that the acyclic functioning of the engine generates wear by means fatigue coupling.

Il a également été constaté une augmentation des besoins en vide qui se traduit par une sollicitation mécanique toujours plus importante du moyen d'accouplement. En effet, les augmentations du besoin en vide engendrent une augmentation du couple transmis au rotor de la pompe par l'arbre à cames, via le moyen d'accouplement. Seul un redimensionnement du moyen d'accouplement permet de s'affranchir d'un risque de rupture de celui-ci. Ce redimensionnement engendre toutefois une augmentation de l'encombrement du dispositif de génération de vide, néfaste à l'installation de cette fonction sur des véhicules dont l'encombrement du moteur doit être optimisé.There has also been an increase in needs vacuum which results in mechanical stress always most important of the coupling means. Indeed, the increases in vacuum requirement generate a increase in torque transmitted to the pump rotor by the camshaft, via the coupling means. Only one resizing the coupling means allows get rid of a risk of rupture of it. This resizing generates an increase of the size of the vacuum generating device, harmful to the installation of this function on vehicles whose the size of the motor must be optimized.

Un but de la présente invention est de proposer un agencement d'une pompe sur un moteur à combustion interne, le moteur comportant une culasse contenant au moins un arbre à cames rotatif, la pompe comportant un stator, un rotor lié en rotation avec l'arbre à cames et un moyen d'aspiration et de refoulement d'un fluide dans un circuit apte à être actionné par le rotor, palliant tout ou partie des inconvénients de l'art antérieur relevés ci-dessus.An object of the present invention is to provide a arrangement of a pump on an internal combustion engine, the engine comprising a cylinder head containing at least one shaft with rotary cam, the pump comprising a stator, a rotor linked in rotation with the camshaft and a means of suction and discharge of a fluid in a circuit capable of being actuated by the rotor, overcoming all or part of the drawbacks of art earlier noted above.

A cette fin, l'agencement selon l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est essentiellement caractérisé en ce qu'au moins une partie du rotor est constituée par une extrémité de l'arbre à cames.To this end, the arrangement according to the invention, moreover conforms to the generic definition given in the preamble above, is essentially characterized in that at least part of the rotor is formed by one end of the shaft with cams.

Par ailleurs, l'invention peut comporter l'une ou plusieurs des caractéristiques suivantes :

  • une extrémité de l'arbre à cames constitue l'intégralité du rotor de la pompe,
  • l'arbre à cames et le rotor forment une seule pièce monobloc réalisée suivant un procédé de moulage et/ou d'usinage,
  • le moyen d'aspiration et de refoulement comprend une palette liée en rotation au rotor et dont le déplacement dans un volume intérieur du stator, génère une dépression entre une entrée et une sortie de la pompe, la palette comprenant deux extrémités destinées à coopérer en glissement avec une surface du volume intérieur de stator,
  • la palette est une plaque sensiblement rectangulaire, logée dans une rainure ménagée dans l'extrémité de l'arbre à cames,
  • l'axe de rotation de l'extrémité de l'arbre à cames est excentré par rapport à l'axe de symétrie du stator de la pompe de sorte que, lors de la rotation de l'arbre à cames, la palette coulisse dans la rainure de l'extrémité suivant un mouvement alternatif et perpendiculaire à l'axe de rotation du rotor.
Furthermore, the invention may include one or more of the following characteristics:
  • one end of the camshaft constitutes the entire pump rotor,
  • the camshaft and the rotor form a single integral piece produced according to a molding and / or machining process,
  • the suction and discharge means comprises a pallet linked in rotation to the rotor and whose displacement in an interior volume of the stator, generates a vacuum between an inlet and an outlet of the pump, the pallet comprising two ends intended to cooperate in sliding with a surface of the internal stator volume,
  • the pallet is a substantially rectangular plate, housed in a groove formed in the end of the camshaft,
  • the axis of rotation of the end of the camshaft is eccentric with respect to the axis of symmetry of the stator of the pump so that, during the rotation of the camshaft, the vane slides in the groove of the end in an alternating movement and perpendicular to the axis of rotation of the rotor.

Selon l'invention, l'extrémité de l'arbre à cames fait avantageusement saillie hors de la culasse du moteur, de sorte que le stator de la pompe est monté sur l'extrémité de l'arbre à cames, le stator étant fixé à la culasse.According to the invention, the end of the camshaft makes advantageously protruding from the cylinder head of the engine, so that the pump stator is mounted on the end of the shaft to cams, the stator being fixed to the cylinder head.

Selon l'invention, le stator est fixé à la culasse par le biais des moyens de fixations du type vis de serrage coopérant avec des alésages usinés dans la culasse du moteur.According to the invention, the stator is fixed to the cylinder head by means of fastening means of the clamping screw type cooperating with machined bores in the cylinder head of the engine.

Avantageusement, l'invention comprend un joint annulaire interposé entre le stator de la pompe et la culasse du moteur afin d'assurer une étanchéité de qualité.Advantageously, the invention comprises an annular seal interposed between the stator of the pump and the cylinder head of the engine to ensure a quality seal.

Avantageusement, l'invention comprend une pompe intégrée dans un circuit, la pornpe étant une pompe à vide et le circuit étant un circuit de vide relié à un dispositif de freinage d'un véhicule.Advantageously, the invention comprises a pump integrated in a circuit, the pornpe being a vacuum pump and the circuit being a vacuum circuit connected to a braking device of a vehicle.

D'autres particularités et avantages apparaítront à la lecture de la description ci-après faite en référence aux figures dans lesquelles :

  • la figure 1 est une représentation schématique simplifiée d'un circuit de fluide muni d'une pompe agencée sur un moteur à combustion interne, selon l'invention,
  • la figure 2 est une vue en perspective et en coupe d'un détail de l'agencement de la pompe de la figure 1, selon la ligne A-A,
  • la figure 3 est une vue en coupe de la pompe, suivant la ligne B-B de la figure 2,
  • la figure 4 est une vue en perspective éclatée d'une partie de l'agencement de la figure 1.
Other features and advantages will appear on reading the description below made with reference to the figures in which:
  • FIG. 1 is a simplified schematic representation of a fluid circuit provided with a pump arranged on an internal combustion engine, according to the invention,
  • FIG. 2 is a perspective view in section of a detail of the arrangement of the pump in FIG. 1, along the line AA,
  • FIG. 3 is a sectional view of the pump, along line BB of FIG. 2,
  • FIG. 4 is an exploded perspective view of part of the arrangement of FIG. 1.

L'invention va être décrite ci-après dans un mode de réalisation préféré et non limitatif, en référence aux figures 1 à 4.The invention will be described below in a mode of preferred and non-limiting embodiment, with reference to Figures 1 to 4.

Parmi les consommateurs connus, il existe des consommateurs en vide pour lesquels la fonction génération de vide s'effectue par le biais d'une pompe, telle une pompe 1 à vide, visible à la figure 1.Among known consumers, there are empty consumers for whom the generation function of vacuum is effected by means of a pump, such as a pump 1 to empty, visible in Figure 1.

En terme de sécurité active, il est connu d'ajouter sur les véhicules automobiles des fonctions, comme l'assistance au freinage d'urgence, par exemple. Pour cette fonction, on fait appel à un circuit 7 de fluide, complémentaire du circuit 70 principale de freinage, dans lequel circule un fluide. Ce circuit 7 complémentaire contient un fluide en pression négative, c'est-à-dire en dépression, afin d'assister l'appui sur une pédale 80 de frein au titre d'assistance au freinage.In terms of active safety, it is known to add on the motor vehicles functions, such as assistance to emergency braking, for example. For this function, we do call for a fluid circuit 7, complementary to circuit 70 main brake, in which a fluid circulates. This circuit 7 complementary contains a negative pressure fluid, that is to say in depression, in order to assist the support on a brake pedal 80 for braking assistance.

Afin d'obtenir une dépression du fluide contenu dans le circuit 7, il est connu d'utiliser la pompe 1 à vide.In order to obtain a vacuum of the fluid contained in the circuit 7, it is known to use pump 1 vacuum.

Le circuit 7 peut comprendre au moins une dérivation 71 permettant, si nécessaire, d'alimenter au moins un autre consommateur 72 en vide. Circuit 7 can include at least one branch 71 allowing, if necessary, to feed at least one other consumer 72 empty.

Classiquement, la pompe 1 à vide, alimentant le circuit 7, est positionnée sur une culasse 3 d'un moteur 2 à combustion interne. La culasse 3 du moteur 2 intègre au moins un arbre 4 à cames destiné à entraíner en rotation un rotor 5 de la pompe 1, visible notamment en figure 2.Conventionally, the vacuum pump 1, supplying the circuit 7, is positioned on a cylinder head 3 of a combustion engine 2 internal. The cylinder head 3 of the engine 2 incorporates at least one shaft 4 cam for rotating a rotor 5 of the pump 1, visible in particular in FIG. 2.

La pompe 1 à vide, selon l'invention, comprend un stator 6, un rotor 5 et un moyen 9 d'aspiration et de refoulement.The vacuum pump 1 according to the invention comprises a stator 6, a rotor 5 and a means 9 for suction and discharge.

Le stator 6 est de forme sensiblement cylindrique et définit dans son volume V intérieur une surface S sensiblement cylindrique.The stator 6 is of substantially cylindrical shape and defines in its interior volume V a surface S substantially cylindrical.

Le moyen 9 d'aspiration et de refoulement comporte une palette 9 de forme sensiblement rectangulaire (Cf. FIG. 2 et 4).The means 9 for suction and delivery includes a pallet 9 of substantially rectangular shape (see FIG. 2 and 4).

Le rotor 5 comprend au moins une rainure 8 dans laquelle est logée la palette 9. La palette 9 est par conséquent liée en rotation au rotor 5.The rotor 5 comprises at least one groove 8 in which the pallet 9 is housed. The pallet 9 is therefore linked in rotor rotation 5.

Le rotor 5 et la palette 9 sont ainsi montés dans ce volume V intérieur de manière à ce que l'axe A2 de symétrie longitudinale du stator 6 soit excentré par rapport à l'axe A1 de rotation du rotor 5 (Cf. FIG. 3).The rotor 5 and the pallet 9 are thus mounted in this interior volume V so that the axis A2 of symmetry longitudinal of stator 6 is offset from axis A1 of rotation of rotor 5 (See FIG. 3).

Le stator 6 comprend au moins une entrée 11 et au moins une sortie 12. L'entrée 11, étant reliée au circuit 7 complémentaire dans lequel circule le fluide en dépression, est située de préférence en périphérie du stator 6, c'est-à-dire sur une paroi cylindrique du stator 6. La sortie 12 est, quant à elle, une ouverture usinée au travers de la culasse 3 et débouchant dans le volume V intérieur du stator 6.The stator 6 comprises at least one input 11 and at least an output 12. Input 11, being connected to circuit 7 in which the fluid circulates under vacuum, is preferably located on the periphery of stator 6, that is to say on a cylindrical wall of the stator 6. The outlet 12 is, in turn, a machined opening through the cylinder head 3 and opening in the interior volume V of the stator 6.

La palette 9 a des dimensions correspondant au diamètre intérieur du stator 6. La palette 9, dont les extrémités 9a et 9b coulissent sur la surface S du volume V intérieur du stator 6, se déplace d'une zone d'aspiration à une zone de refoulement définies par le volume V intérieur du stator 6 et par l'entrée 11 et la sortie 12 de la pompe 1. Pallet 9 has dimensions corresponding to the diameter inside of the stator 6. The pallet 9, the ends of which 9a and 9b slide on the surface S of the interior volume V of the stator 6, moves from a suction zone to a discharge zone defined by the interior volume V of the stator 6 and by the input 11 and the output 12 of the pump 1.

La rainure 8, ménagée dans le rotor 5 suivant une direction sensiblement perpendiculaire à l'axe A1 de rotation du rotor 5, permet à la palette 9 de coulisser suivant un mouvement alternatif sur le rotor 5.The groove 8, formed in the rotor 5 according to a direction substantially perpendicular to the axis A1 of rotation of the rotor 5, allows the pallet 9 to slide along a reciprocating movement on the rotor 5.

Selon l'invention, une extrémité 5 de l'arbre 4 à cames constitue le rotor de la pompe 1. Ainsi, cette extrémité 5 de l'arbre 4 à cames coopère directement avec la palette 9 afin de générer l'aspiration et le refoulement de fluide circulant dans le circuit 7.According to the invention, one end 5 of the camshaft 4 constitutes the rotor of the pump 1. Thus, this end 5 of the camshaft 4 cooperates directly with the pallet 9 in order to generate the suction and discharge of fluid circulating in circuit 7.

L'extrémité 5 de l'arbre 4 à cames fait saillie hors de la culasse 3, au travers d'un passage 16 prévu à cet effet et visible à la figure 4. L'arbre 4 à cames a donc une longueur choisie supérieure à celle de la culasse 3. Le stator 6 de la pompe 1 est alors directement monté autour de l'extrémité 5 de l'arbre 4 à cames.The end 5 of the camshaft 4 projects out of the cylinder head 3, through a passage 16 provided for this purpose and visible in Figure 4. The camshaft 4 therefore has a length chosen higher than that of the cylinder head 3. The stator 6 of the pump 1 is then directly mounted around the end 5 from the camshaft 4.

Ainsi, du fait que l'extrémité 5 de l'arbre 4 à cames constitue le rotor de la pompe 1 à vide, cette pièce unique et monobloc peut être réalisée par un procédé de moulage, par exemple. L'invention permet de simplifier l'agencement d'une pompe à vide sur un moteur et de s'affranchir des risques de rupture de la liaison mécanique habituellement utilisée dans l'art antérieur.Thus, the fact that the end 5 of the camshaft 4 constitutes the rotor of the vacuum pump 1, this unique part and monobloc can be produced by a molding process, by example. The invention simplifies the arrangement of a vacuum pump on an engine and get rid of the risks of break in the mechanical connection usually used in prior art.

Selon un mode de réalisation préféré de l'invention, la culasse 3 est constituée de 2 parties, une partie 3a supérieure et une partie 3b inférieure (Cf. FIG. 4). Les deux parties 3a et 3b de la culasse comportent chacune une ouverture 16a, 16b, lesquelles sont sensiblement de forme en demi-cercle. Disposées jointivement lors du montage de la culasse 3, les deux ouvertures 16a et 16b décrivent un passage 16 de forme cylindrique au travers de la culasse 3.According to a preferred embodiment of the invention, the cylinder head 3 consists of 2 parts, an upper part 3a and a lower part 3b (see FIG. 4). The two parts 3a and 3b of the cylinder head each have an opening 16a, 16b, which are substantially semi-circular in shape. Arranged contiguously during the mounting of the cylinder head 3, the two openings 16a and 16b describe a passage 16 of shape cylindrical through the cylinder head 3.

Suivant un mode de réalisation préféré de l'invention, le passage 16 forme un pallier pour l'arbre 4 à cames. Ceci permet de supprimer des problèmes de mauvais alignement de l'arbre 4 à cames. Ainsi, ce meilleur alignement de l'arbre 4 à cames permet de diminuer le bruit de fonctionnement de la fonction génération de vide, par comparaison avec les dispositifs de l'art antérieur.According to a preferred embodiment of the invention, the passage 16 forms a landing for the camshaft 4. This helps to remove misalignment issues from the camshaft 4. So, this better alignment of the shaft 4 to cams reduces the operating noise of the vacuum generation function, by comparison with prior art devices.

Comme mis en évidence sur les figures 3 et 4, l'extrémité 5 de l'arbre 4 à cames a un diamètre supérieur au diamètre du reste de l'arbre 4 à cames. L'étanchéité entre l'extrémité 5 de l'arbre 4 à cames et la culasse 3 est de préférence assurée sans l'ajout d'un élément d'étanchéité supplémentaire. Cependant, un élément d'étanchéité supplémentaire pourrait, par exemple, être disposé au niveau de l'ouverture 16 de la culasse 3.As highlighted in Figures 3 and 4, the end 5 of the camshaft 4 has a diameter greater than the diameter of the rest of camshaft 4. The seal between the end 5 of the camshaft 4 and the cylinder head 3 is preferably ensured without adding an additional sealing element. However, an additional sealing element could, for example, be disposed at the opening 16 of the cylinder head 3.

Pour obtenir un niveau d'étanchéité satisfaisant entre le volume V intérieur du stator 6 et l'environnement extérieur, le côté du stator 6 en appui sur la culasse 3 comporte un joint 13 annulaire, de type joint torique en élastomère par exemple. Le joint 13 est disposé dans un logement 17 de révolution formé dans le stator 6.To obtain a satisfactory level of tightness between the internal volume V of the stator 6 and the external environment, the side of the stator 6 bearing on the cylinder head 3 has a seal 13 annular, of the elastomer O-ring type for example. The gasket 13 is placed in a housing 17 of revolution formed in stator 6.

Le joint 13 annulaire subit une déformation lors du montage du stator 6 sur la culasse 3. Le joint 13 est pris alors en sandwich entre le corps du stator 6 et la culasse 3. Cette déformation, garante d'une parfaite étanchéité, est maintenue par les moyens 14 de fixation du stator 6 sur la culasse 3.The annular seal 13 undergoes deformation during mounting the stator 6 on the cylinder head 3. The gasket 13 is then taken sandwiched between the stator body 6 and the cylinder head 3. This deformation, guaranteeing a perfect seal, is maintained by the means 14 for attaching the stator 6 to the cylinder head 3.

Ces moyens de fixation du stator 6 sur la culasse 3 se composent, par exemple, d'au moins deux vis 14 de serrage coopérant avec des alésages 15 taraudés formés dans la culasse 3 (Cf. FIG. 2 à 4).These means for attaching the stator 6 to the cylinder head 3 are consist, for example, of at least two clamping screws 14 cooperating with threaded bores 15 formed in the cylinder head 3 (See FIG. 2 to 4).

De par le montage du stator 6 directement sur l'arbre 4 à cames, l'invention résout avantageusement les problèmes d'encombrement présent dans l'art antérieur. En effet, l'invention permet de s'affranchir d'une bride de montage intercalée traditionnellement entre le stator 6 et la culasse 3. On conçoit donc aisément que l'invention permet une réduction notable de l'encombrement associé à la fonction génération de vide.By mounting the stator 6 directly on the shaft 4 to cams, the invention advantageously solves the problems space present in the prior art. Indeed, the invention overcomes a mounting flange traditionally interposed between the stator 6 and the cylinder head 3. It is therefore easy to see that the invention allows a reduction significant size associated with the generation function of empty.

Claims (10)

Agencement d'une pompe (1) sur un moteur (2) à combustion interne, le moteur comportant une culasse (3) contenant au moins un arbre (4) à cames rotatif, la pompe (1) comportant un stator (6), un rotor (5) lié en rotation avec l'arbre (4) à cames et un moyen (9) d'aspiration et de refoulement d'un fluide dans un circuit (7) apte à être actionné par le rotor (5), caractérisé en ce qu'au moins une partie du rotor est constituée par une extrémité (5) de l'arbre (4) à cames.Arrangement of a pump (1) on an internal combustion engine (2), the engine comprising a cylinder head (3) containing at least one rotary camshaft (4), the pump (1) comprising a stator (6), a rotor (5) linked in rotation with the camshaft (4) and means (9) for suction and delivery of a fluid in a circuit (7) capable of being actuated by the rotor (5), characterized in that at least part of the rotor is formed by one end (5) of the camshaft (4). Agencement selon la revendication 1 caractérisé en ce qu'une extrémité (5) de l'arbre (4) à cames constitue l'intégralité du rotor de la pompe (1).Arrangement according to Claim 1, characterized in that one end (5) of the camshaft (4) constitutes the entire rotor of the pump (1). Agencement selon la revendication 1 ou 2 caractérisé en ce que l'arbre (4) à cames et le rotor (5) forment une seule pièce monobloc réalisée suivant un procédé de moulage et/ou d'usinage.Arrangement according to claim 1 or 2 characterized in that the camshaft (4) and the rotor (5) form a single integral piece produced according to a molding and / or machining process. Agencement selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le moyen (9) d'aspiration et de refoulement comprend au moins une palette (9) liée en rotation au rotor (5) et dont le déplacement dans un volume (V) intérieur du stator (6), génère une dépression entre une entrée (11) et une sortie (12) de la pompe (1), la palette (9) comprenant deux extrémités (9a, 9b) destinée à coopérer en glissement avec une surface (S) du volume (V) intérieur du stator (6).Arrangement according to any one of claims 1 to 3, characterized in that the suction and delivery means (9) comprise at least one pallet (9) linked in rotation to the rotor (5) and whose displacement in a volume (V) inside the stator (6), generates a vacuum between an inlet (11) and an outlet (12) of the pump (1), the vane (9) comprising two ends (9a, 9b) intended to cooperate in sliding with a surface (S) of the interior volume (V) of the stator (6). Agencement selon la revendication 4 caractérisé en ce que la palette (9) est une plaque sensiblement rectangulaire, logée dans une rainure (8) ménagée dans l'extrémité (5) de l'arbre (4) à cames. Arrangement according to claim 4 characterized in that the pallet (9) is a substantially rectangular plate, housed in a groove (8) formed in the end (5) of the camshaft (4). Agencement selon la revendication 4 ou 5, caractérisé en ce que l'axe (A1) de rotation de l'arbre (4) à cames est excentré par rapport de l'axe (A2) de symétrie du stator (6) de la pompe (1) de sorte que, lors de la rotation de l'arbre (4) à cames, la palette (9) coulisse dans la rainure (8) de l'extrémité (5) suivant un mouvement alternatif et perpendiculaire à l'axe (A1 ) de rotation du rotor.Arrangement according to claim 4 or 5, characterized in that the axis (A1) of rotation of the camshaft (4) is eccentric relative to the axis (A2) of symmetry of the stator (6) of the pump (1) so that, during the rotation of the camshaft (4), the pallet (9) slides in the groove (8) of the end (5) in an alternating movement and perpendicular to the axis (A1) rotation of the rotor. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'extrémité (5) de l'arbre (4) à cames fait saillie hors de la culasse (3) du moteur (2) et en ce que le stator (6) est monté sur cette extrémité (5) et est fixé sur la culasse (3).Arrangement according to any one of the preceding claims, characterized in that the end (5) of the camshaft (4) projects from the cylinder head (3) of the engine (2) and in that the stator ( 6) is mounted on this end (5) and is fixed to the cylinder head (3). Agencement selon la revendication 7, caractérisé en ce qu'un joint (13) annulaire est interposé entre le stator (6) et la culasse (3) du moteur (2).Arrangement according to claim 7, characterized in that an annular seal (13) is interposed between the stator (6) and the cylinder head (3) of the engine (2). Agencement selon la revendication 7 ou 8, caractérisé en ce que le stator (6) est fixé à la culasse (3) par le biais des moyens de fixation du type vis (14) de serrage coopérant avec des alésages (15) usinés dans la culasse (3).Arrangement according to claim 7 or 8, characterized in that the stator (6) is fixed to the cylinder head (3) by means of fixing means of the screw type (14) clamping cooperating with bores (15) machined in the cylinder head (3). Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce que la pompe (1) est une pompe à vide et en ce que le circuit (7) est un circuit de vide relié à un dispositif de freinage d'un véhicule.Arrangement according to any one of the preceding claims, characterized in that the pump (1) is a vacuum pump and in that the circuit (7) is a vacuum circuit connected to a braking device of a vehicle.
EP03293206A 2002-12-18 2003-12-18 Pump arrangement for a combustion engine Withdrawn EP1431524A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0216100A FR2849109B1 (en) 2002-12-18 2002-12-18 ARRANGEMENT OF A PUMP ON AN INTERNAL COMBUSTION ENGINE
FR0216100 2002-12-18

Publications (1)

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EP1431524A1 true EP1431524A1 (en) 2004-06-23

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EP03293206A Withdrawn EP1431524A1 (en) 2002-12-18 2003-12-18 Pump arrangement for a combustion engine

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EP (1) EP1431524A1 (en)
FR (1) FR2849109B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004054089A1 (en) * 2004-11-09 2006-05-11 Volkswagen Ag Motor vehicle`s e.g. passenger motor car, motor drive unit and hydraulic unit arrangement, has hydraulic unit provided with mechanically driven pressure generator, which is coupled with drive chain and is driven by chain
FR2885174A1 (en) * 2005-04-28 2006-11-03 Renault Sas Internal combustion engine for e.g. motorizing motor vehicle, has vacuum pump integrated, using recess, in assembly formed by cylinder head and valve mechanism casing, cover placed at outer end of recess
CN104405500A (en) * 2014-09-29 2015-03-11 长城汽车股份有限公司 Engine and vehicle having same

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Publication number Priority date Publication date Assignee Title
US4458641A (en) * 1982-11-13 1984-07-10 Ford Motor Company Internal combustion engine
US4662320A (en) * 1984-05-10 1987-05-05 Honda Giken Kogyo Kabushiki Kaisha Water pump system for water-cooled internal combustion engine
EP0376352A2 (en) * 1988-12-30 1990-07-04 Yamaha Motor Co., Ltd. Air-liquid cooled engine
US5497735A (en) * 1992-06-11 1996-03-12 Generac Corporation Internal combustion engine for portable power generating equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458641A (en) * 1982-11-13 1984-07-10 Ford Motor Company Internal combustion engine
US4662320A (en) * 1984-05-10 1987-05-05 Honda Giken Kogyo Kabushiki Kaisha Water pump system for water-cooled internal combustion engine
EP0376352A2 (en) * 1988-12-30 1990-07-04 Yamaha Motor Co., Ltd. Air-liquid cooled engine
US5497735A (en) * 1992-06-11 1996-03-12 Generac Corporation Internal combustion engine for portable power generating equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004054089A1 (en) * 2004-11-09 2006-05-11 Volkswagen Ag Motor vehicle`s e.g. passenger motor car, motor drive unit and hydraulic unit arrangement, has hydraulic unit provided with mechanically driven pressure generator, which is coupled with drive chain and is driven by chain
FR2885174A1 (en) * 2005-04-28 2006-11-03 Renault Sas Internal combustion engine for e.g. motorizing motor vehicle, has vacuum pump integrated, using recess, in assembly formed by cylinder head and valve mechanism casing, cover placed at outer end of recess
CN104405500A (en) * 2014-09-29 2015-03-11 长城汽车股份有限公司 Engine and vehicle having same

Also Published As

Publication number Publication date
FR2849109B1 (en) 2005-02-11
FR2849109A1 (en) 2004-06-25

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