EP3379066B1 - Integration of the drive cam of the hp pump on the flywheel - Google Patents

Integration of the drive cam of the hp pump on the flywheel Download PDF

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Publication number
EP3379066B1
EP3379066B1 EP18160571.8A EP18160571A EP3379066B1 EP 3379066 B1 EP3379066 B1 EP 3379066B1 EP 18160571 A EP18160571 A EP 18160571A EP 3379066 B1 EP3379066 B1 EP 3379066B1
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EP
European Patent Office
Prior art keywords
cam
crankshaft
flywheel
arrangement
actuating cam
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EP18160571.8A
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German (de)
French (fr)
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EP3379066A1 (en
Inventor
Jean-Pierre Millon
Ludovic TESSIER
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Renault SAS
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Renault SAS
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Publication of EP3379066A1 publication Critical patent/EP3379066A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/0068—Adaptations for other accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0046—Shape of casings adapted to facilitate fitting or dismantling of engine parts
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams

Definitions

  • the present invention relates to the field of motor vehicles and relates to a high pressure fuel supply pump.
  • the invention relates more particularly to an arrangement of an activation cam for the high pressure pump, integral in rotation with a crankshaft movable in rotation inside an internal chamber of a heat engine of a motor vehicle.
  • the invention relates to an internal combustion engine of a motor vehicle comprising a crankshaft movable in rotation about a longitudinal axis of the engine. Fuel is supplied to the engine by a high pressure pump which replaces a carburetor and which is actuated by the rotation of the crankshaft.
  • the document FR2 984 965 - A1 proposes an arrangement of a fuel pump at one end of a camshaft, said pump has a sliding axis coaxial with the axis of the camshaft.
  • the document WO2013 / 160106 discloses an arrangement of a fuel pump at one end of a crankshaft facing a flywheel.
  • the document FR2997133 describes a flywheel comprising a tubular protuberance surrounding the end of a crankshaft facing said flywheel.
  • the object of the invention is to remedy these problems and one of the objects of the invention is a particular arrangement of the actuating cam of a high pressure fuel supply pump at one end of the crankshaft.
  • the object of the invention relates to an arrangement of an actuating cam for the fuel pump at one end of the crankshaft facing the flywheel of the engine while minimizing the size of the engine.
  • the object of the invention relates more particularly to an arrangement of a cam for actuating a fuel pump at one end of the crankshaft facing the flywheel of the engine according to claim 1.
  • the actuating cam is fixed integral in rotation with the flywheel which is itself fixed integral in rotation with the crankshaft.
  • the arrangement of said cam integral with the flywheel also allows a rotational connection of the cam with the crankshaft when said Flywheel is mounted at one end of the crankshaft in a space-saving location and therefore with minimal impact on the engine size.
  • the integral connection of the cam with the flywheel also allows a simplified assembly of the actuating cam.
  • the actuating cam carries an annular seal to control the size of the arrangement.
  • the following description can take into account three spatial axes which are the longitudinal direction X of the engine, the transverse direction Y coplanar with the longitudinal direction X along a horizontal plane of the vehicle passing for example through the axles of the wheels of the vehicle and a direction Z vertical directed towards the top of the vehicle.
  • the longitudinal direction X is relative to the heat engine and therefore is orthogonal to the longitudinal direction of the vehicle for an engine mounted transversely.
  • an accessory face of the engine can be distinguished from which opens a first accessory end of the crankshaft around which is mounted at least one wheel (not shown) for rotating the axes of the accessory elements (not shown). of the engine such as the water pump, and a coupling face from which opens the coupling end of the crankshaft diametrically opposite to the first end and connected with a flywheel and a gearbox (not shown).
  • a heat engine 10 or internal combustion of a motor vehicle comprises a cylinder block 11 comprising at least one cylinder 12 in which a piston (not shown) is able to slide in a reciprocating movement along the vertical axis Z of said cylinder and a cylinder head (not shown) covering the upper part of the cylinder block facing an engine hood of the vehicle.
  • the movements of the piston are driven by a variation of a combustion chamber delimited by the wall 13 of the at least one cylinder, said piston and the cylinder head.
  • the piston is linked to a crankshaft 14 arranged along an axis X that is substantially horizontal and orthogonal to the vertical axis Z.
  • the reciprocating sliding movements of the piston cause a rotational movement of the crankshaft.
  • the sliding movements of the piston are not, however, carried out in a regular manner and produce acyclisms which have repercussions on the transmission elements connected to said engine 10 and particularly to the crankshaft.
  • a flywheel 15 is connected to the crankshaft driven by the pistons to absorb irregularities in engine torque and reduce acyclisms.
  • the flywheel 15 is arranged in a known manner fixed to the coupling end 16 of the crankshaft and connected with the gearbox.
  • the face of the motor facing the flywheel is referred to as the coupling face 17.
  • the invention relates to an arrangement of the high pressure fuel supply pump actuated by means of an actuating cam 20 disposed at the coupling end of the crankshaft facing a coupling face 17 of the engine and connected to it. a flywheel 15.
  • said fuel pump is arranged radially to the axis of the cam and comprises a piston bearing against the peripheral surface of said cam.
  • Said fuel feed pump is arranged according to the invention orthogonally to the X axis of the crankshaft and to the coupling end 17 'of said crankshaft 14.
  • the flywheel 15 carries the actuating cam 20, said cam is arranged opposite the crankshaft, that is to say that said cam is mounted fixed integral with the rotating flywheel. and in translation, on the side of said flywheel facing the crankshaft 14.
  • the figures 2 to 5 represent embodiments of the invention.
  • the shape of said cross section may however be different.
  • the actuating cam 20 has a substantially cylindrical longitudinal orifice 21 coaxial with the X axis of the cam which is adapted to surround the coupling end 17 'of the crankshaft. Said opening is extended along the X axis by a through orifice 22 which allows the passage of a fixing screw to secure the flywheel 15 with the crankshaft 14.
  • Said cam 20 is fixed integral with the flywheel 15.
  • said cam comprises threaded orifices obtained for example by drilling parallel to the cam axis X.
  • the flywheel also has through holes in vis-à-vis the threaded holes of the cam to allow fixing of the cam with the flywheel by means of fixing screws.
  • the flywheel 15 is fixed in a known manner to the coupling end 17 'of the crankshaft so that the cam 20 is turned towards the crankshaft 14.
  • the rotation of the crankshaft 14 then causes the rotation of the cam 20 which is suitable for actuating the piston of the fuel pump.
  • the cylinder block 11 comprises a wall 23 delimiting a reception chamber 24 for housing the actuation cam; said wall extends the cylinder block along the longitudinal axis X and it comprises a radial opening passing through (not shown) along a radial axis orthogonal to the longitudinal axis X for the passage of the substantially cylindrical body of the fuel pump.
  • Said reception chamber 24 is sealed by means of seals 25. Said seals are arranged on both sides along the longitudinal axis X of the actuating cam.
  • the flywheel 15 is mounted fixed integral with the coupling end 17 'of the crankshaft 14.
  • the longitudinal orifice 21 of the cam 20 surrounds the coupling end 17 'of the crankshaft 14 except for the mounting clearance.
  • the cam is fixed by threaded connections to the flywheel 14 or to a disc forming said flywheel.
  • the cam is mounted housed in the reception chamber 24.
  • the fuel pump can be fixed to the wall 23 of the cylinder block so that its axis is substantially orthogonal to the axis X of the crankshaft 14, the body of the cylinder. the pump passes through the radial opening made in the wall 23 of the reception chamber 24.
  • the flywheel has a tubular protuberance 29 which is mounted around the coupling end 17 'of the crankshaft.
  • Said protuberance 29 has a substantially cylindrical recess 30 complementary to the coupling end 17 'of the crankshaft except for the mounting clearance.
  • the protuberance carries the actuating cam 20 mounted in such a way that its axis of rotation coincides with the axis of the flywheel.
  • the cam is preferably mounted by hooping or by welding surrounding the tubular protuberance 29.
  • the actuating cam 20 and the tubular protrusion 29 are turned towards the crankshaft 14 such that the coupling end 17 'of the crankshaft is pressed into the recess 30 of said protuberance 29, the cam 20 then surrounds said coupling end 17 'of the crankshaft.
  • the flywheel 15 is fixed to the end of the crankshaft by means of the threaded connection.
  • the actuating cam 20 carried by the tubular protuberance 29 of the flywheel is housed directly in a chamber of connecting rods 34 in which are also housed at least one crank pin 31 and at least a journal 32 forming the crankshaft 19.
  • the retaining bearing 27 of the crankshaft in this case surrounds the tubular protuberance 29 of the flywheel 15.
  • the actuating cam 20 housed in the connecting rod chamber 34 then benefits from an oil mist invading said connecting rod chamber during of the operation of the engine, which can make it possible to avoid the creation of a duct for supplying lubricating liquid to the contact surface of the actuating cam 20 with the piston of the fuel pump.
  • the fuel pump arrangement according to the invention has little impact on the size of the heat engine.
  • the invention is not limited to the sole embodiments of this socket, described above by way of examples, it embraces on the contrary all the variants thereof.
  • the actuating cam can be integrated into the flywheel or part of said flywheel, without thereby departing from the scope of the invention.

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention se rapporte au domaine des véhicules automobiles et concerne une pompe haute pression d'alimentation en carburant.The present invention relates to the field of motor vehicles and relates to a high pressure fuel supply pump.

L'invention concerne plus particulièrement un agencement d'une came d'activation de la pompe haute pression, solidaire en rotation d'un vilebrequin mobile en rotation à l'intérieur d'une chambre intérieure d'un moteur thermique de véhicule automobile.The invention relates more particularly to an arrangement of an activation cam for the high pressure pump, integral in rotation with a crankshaft movable in rotation inside an internal chamber of a heat engine of a motor vehicle.

L'invention concerne également un moteur à combustion interne de véhicule automobile comportant un carter-cylindres entourant un vilebrequin comportant une came d'activation de pompe à carburant haute pression fixée sur un volant d'inertie qui est connecté à une extrémité d'accouplement du vilebrequin.The invention also relates to a motor vehicle internal combustion engine comprising a cylinder block surrounding a crankshaft comprising a high pressure fuel pump activation cam fixed to a flywheel which is connected to a coupling end of the. crankshaft.

Etat de la techniqueState of the art

L'invention concerne un moteur à combustion interne de véhicule automobile comportant un vilebrequin mobile en rotation autour d'un axe longitudinal du moteur. L'alimentation en carburant du moteur est effectuée grâce à une pompe haute pression qui remplace un carburateur et qui est actionnée par la rotation du vilebrequin.The invention relates to an internal combustion engine of a motor vehicle comprising a crankshaft movable in rotation about a longitudinal axis of the engine. Fuel is supplied to the engine by a high pressure pump which replaces a carburetor and which is actuated by the rotation of the crankshaft.

Différents agencements de pompes haute pression fixés à un moteur thermique sont connus.Different arrangements of high pressure pumps attached to a heat engine are known.

Selon une manière connue, une pompe haute pression est fixée extérieure au moteur et peut être entraînée indirectement par le vilebrequin par l'intermédiaire d'un système de transmission de mouvement, comprenant des poulies et au moins une bande de transmission qui peut être une chaîne ou une courroie. Par exemple, la pompe haute pression est actionnée par une came fixée à un arbre mobile en rotation autour d'un axe parallèle à l'axe du vilebrequin, ledit arbre est entrainé en rotation par le vilebrequin grâce à un dispositif de transmission comprenant des roues d'entrainement sensiblement coplanaires et fixées à l'extrémité du vilebrequin et de l'arbre mobile et une courroie entourant lesdites roues.According to a known manner, a high pressure pump is fixed outside the engine and can be driven indirectly by the crankshaft via a motion transmission system, comprising pulleys and at least one transmission band which can be a chain. or a belt. For example, the high pressure pump is actuated by a cam fixed to a movable shaft in rotation about an axis parallel to the axis of the crankshaft, said shaft is driven in rotation by the crankshaft by means of a transmission device comprising drive wheels that are substantially coplanar and fixed to the end of the crankshaft and of the movable shaft and a belt surrounding said wheels.

La pompe est conventionnellement une pompe à plateau qui comporte un arbre d'entrée entraînant en rotation un plateau qui est incliné par rapport à l'axe et qui est susceptible de solliciter des pistons axiaux montés mobiles dans des chambres dans lesquelles est admis puis éjecté le carburant.The pump is conventionally a plate pump which comprises an input shaft driving in rotation a plate which is inclined with respect to the axis and which is capable of stressing the axial pistons mounted to move in chambers into which is admitted and then ejected. fuel.

Il est aussi connu de l'état de la technique, et notamment du document DE102011107291 un moteur comportant une pompe comportant un piston unique, dont le corps est fixé au bloc et dont le piston est entraîné alternativement par un poussoir dont l'extrémité comporte d'un galet qui est susceptible d'être sollicité par une came portée par un arbre interne au bloc du moteur, ledit arbre étant parallèle au vilebrequin et étant entraîné par ledit vilebrequin par l'intermédiaire d'un engrenage.It is also known from the state of the art, and in particular from the document DE102011107291 an engine comprising a pump comprising a single piston, the body of which is fixed to the block and the piston of which is driven alternately by a pusher, the end of which comprises a roller which is capable of being biased by a cam carried by a shaft internal to the engine block, said shaft being parallel to the crankshaft and being driven by said crankshaft via a gear.

Une telle conception présente l'avantage d'être plus compacte que la conception conventionnelle, mais elle présente néanmoins l'inconvénient de nécessiter un bloc moteur pouvant accueillir un arbre supplémentaire, avec ce que cela implique en termes de complexité de moulage et d'usinages supplémentaires dudit bloc.Such a design has the advantage of being more compact than the conventional design, but it nevertheless has the drawback of requiring an engine block that can accommodate an additional shaft, with what this implies in terms of complexity of molding and machining. of said block.

La publication FR3011588-A1 divulgue une came montée mobile en rotation autour d'un axe confondu avec l'axe d'un vilebrequin de moteur thermique de véhicule automobile pour actionner une pompe haute pression d'alimentation en carburant de moteur thermique. Ladite came est disposée entre deux bras dudit vilebrequin.The publication FR3011588-A1 discloses a cam mounted to be movable in rotation around an axis coincident with the axis of a motor vehicle heat engine crankshaft to actuate a high pressure heat engine fuel feed pump. Said cam is arranged between two arms of said crankshaft.

Un inconvénient est que cet agencement nécessite de repousser l'espace entre les deux bras ce qui peut être impactant pour l'architecture du moteur et augmente sensiblement l'encombrement dudit moteur.One drawback is that this arrangement requires the space between the two arms to be pushed back, which can have an impact on the architecture of the engine and significantly increases the size of said engine.

Le document FR2 984 965 - A1 propose un agencement d'une pompe à carburant à une extrémité d'un arbre à cames, ladite pompe présente un axe de coulissement coaxial avec l'axe de l'arbre à cames.The document FR2 984 965 - A1 proposes an arrangement of a fuel pump at one end of a camshaft, said pump has a sliding axis coaxial with the axis of the camshaft.

Le document WO2013/160106 décrit un agencement d'une pompe à carburant à une extrémité d'un vilebrequin tournée vers un volant d'inertie. Le document FR2997133 décrit un volant d'inertie comportant une protubérance tubulaire entourant l'extrémité d'un vilebrequin tournée vers ledit volant d'inertie.The document WO2013 / 160106 discloses an arrangement of a fuel pump at one end of a crankshaft facing a flywheel. The document FR2997133 describes a flywheel comprising a tubular protuberance surrounding the end of a crankshaft facing said flywheel.

L'inconvénient de ce type d'agencement est un accroissement sensible de la dimension longitudinale du moteur ce qui est contraignant pour des véhicules comportant un compartiment moteur avec des dimensions réduites.The drawback of this type of arrangement is a significant increase in the longitudinal dimension of the engine, which is restrictive for vehicles comprising an engine compartment with reduced dimensions.

Le but de l'invention est de remédier à ces problèmes et un des objets de l'invention est un agencement particulier de la came d'actionnement d'une pompe haute pression d'alimentation de carburant à une extrémité du vilebrequin.The object of the invention is to remedy these problems and one of the objects of the invention is a particular arrangement of the actuating cam of a high pressure fuel supply pump at one end of the crankshaft.

Bref résumé de l'inventionBrief summary of the invention

L'objet de l'invention concerne un agencement d'une came d'actionnement de la pompe à carburant à une extrémité du vilebrequin tournée vers le volant d'inertie du moteur en minimisant l'encombrement du moteur.The object of the invention relates to an arrangement of an actuating cam for the fuel pump at one end of the crankshaft facing the flywheel of the engine while minimizing the size of the engine.

L'objet de l'invention concerne plus particulièrement un agencement d'une came d'actionnement d'une pompe à carburant à une extrémité du vilebrequin tournée vers le volant d'inertie du moteur selon la revendication 1.The object of the invention relates more particularly to an arrangement of a cam for actuating a fuel pump at one end of the crankshaft facing the flywheel of the engine according to claim 1.

De manière avantageuse, la came d'actionnement est fixée solidaire en rotation au volant d'inertie qui est lui-même fixé solidaire en rotation avec le vilebrequin. L'agencement de ladite came solidaire du volant moteur permet également une liaison en rotation de la came avec le vilebrequin lorsque ledit volant moteur est monté à une extrémité du vilebrequin à un emplacement peu encombré et donc avec un impact minime sur l'encombrement du moteur. La liaison solidaire de la came avec le volant d'inertie permet également un montage simplifié de la came d'actionnement.Advantageously, the actuating cam is fixed integral in rotation with the flywheel which is itself fixed integral in rotation with the crankshaft. The arrangement of said cam integral with the flywheel also allows a rotational connection of the cam with the crankshaft when said Flywheel is mounted at one end of the crankshaft in a space-saving location and therefore with minimal impact on the engine size. The integral connection of the cam with the flywheel also allows a simplified assembly of the actuating cam.

Selon d'autres caractéristiques de l'invention :

  • la came est montée entourant l'extrémité du vilebrequin.
According to other characteristics of the invention:
  • the cam is mounted around the end of the crankshaft.

De manière avantageuse, l'agencement de la came entourant l'extrémité du vilebrequin permet une optimisation de l'encombrement du moteur notamment en minimisant la longueur du moteur selon l'axe longitudinal.

  • la protubérance tubulaire porte la came d'actionnement.
Advantageously, the arrangement of the cam surrounding the end of the crankshaft allows optimization of the size of the engine, in particular by minimizing the length of the engine along the longitudinal axis.
  • the tubular protuberance carries the actuating cam.

Selon l'invention, la came d'actionnement de la pompe à carburant est portée par la protubérance tubulaire du volant moteur pénétrant dans la chambre intérieure du moteur par un orifice creusé dans le carter-cylindres en regard avec une extrémité du vilebrequin, ledit orifice étant traversé par la protubérance tubulaire, ce qui permet un montage simple de la came autour de l'extrémité du vilebrequin.

  • la came est montée entourant la protubérance par frettage ou soudure.
According to the invention, the fuel pump actuating cam is carried by the tubular protuberance of the flywheel penetrating into the internal chamber of the engine via an orifice hollowed out in the cylinder block facing one end of the crankshaft, said orifice being crossed by the tubular protuberance, which allows simple mounting of the cam around the end of the crankshaft.
  • the cam is mounted surrounding the protuberance by shrinking or welding.

De manière avantageuse, la came est montée autour de la protubérance tubulaire par frettage ou soudure, ce qui permet un positionnement précis de la came par rapport au vilebrequin.

  • la came d'actionnement est entourée par la paroi du carter-cylindres.
Advantageously, the cam is mounted around the tubular protuberance by shrinking or welding, which allows precise positioning of the cam relative to the crankshaft.
  • the actuating cam is surrounded by the wall of the cylinder block.

De manière avantageuse, la came d'actionnement ainsi que la pompe à carburant sont entourées par la paroi du carter-cylindres ce qui permet d'assurer une étanchéité de l'ensemble à moindre coût.

  • le carter-cylindres comporte un évidement prolongé radialement à l'axe du vilebrequin par un orifice, pour loger la pompe à carburant.
Advantageously, the actuating cam as well as the fuel pump are surrounded by the wall of the cylinder block, which makes it possible to seal the assembly at a lower cost.
  • the cylinder block has a recess extended radially to the axis of the crankshaft by an orifice, to house the fuel pump.

De manière avantageuse, un évidement est ménagé dans le carter cylindres à une extrémité longitudinale dudit carter en vis-à-vis du volant moteur pour former une chambre d'accueil destiné à loger la pompe à carburant.

  • la came est logée dans la chambre de bielles.
Advantageously, a recess is made in the cylinder block at a longitudinal end of said housing facing the engine flywheel to form a receiving chamber intended to house the fuel pump.
  • the cam is housed in the connecting rod chamber.

De manière avantageuse, la came est logée directement dans la chambre de bielles et bénéficie de la circulation d'huile dans ladite chambre pour la lubrification des contacts entre la came et le piston de la pompe à carburant. De ce fait, l'agencement de came à l'intérieur de la chambre de bielles peut permettre d'éviter la définition d'un conduit de lubrification.

  • le carter cylindres comporte une chambre d'accueil séparée de la chambre de bielles selon l'axe longitudinal du carter-cylindres pour loger la came d'actionnement.
Advantageously, the cam is housed directly in the connecting rod chamber and benefits from the circulation of oil in said chamber for lubricating the contacts between the cam and the piston of the fuel pump. Therefore, the cam arrangement inside the connecting rod chamber can avoid the definition of a lubrication duct.
  • the cylinder block has a receiving chamber separate from the connecting rod chamber along the longitudinal axis of the cylinder block to house the actuating cam.

De manière avantageuse, le carter-cylindres comporte une chambre d'accueil pour loger la came d'actionnement ainsi que la pompe à carburant, ladite chambre étant séparée de la chambre de bielles.

  • la chambre d'accueil est fermée de façon étanche par des joints annulaires.
Advantageously, the cylinder block comprises a receiving chamber for housing the actuating cam as well as the fuel pump, said chamber being separate from the connecting rod chamber.
  • the reception chamber is sealed by annular seals.

De manière avantageuse, la chambre d'accueil où est logée la came et la pompe à carburant est isolée de façon étanche de la chambre de bielles pour la fiabilité de fonctionnement de la pompe.

  • la came porte un joint d'étanchéité.
Advantageously, the reception chamber where the cam and the fuel pump are housed is sealed off from the connecting rod chamber for the reliability of operation of the pump.
  • the cam has a seal.

De manière avantageuse, la came d'actionnement porte un joint d'étanchéité annulaire pour maitriser l'encombrement de l'agencement.Advantageously, the actuating cam carries an annular seal to control the size of the arrangement.

Brève description des figuresBrief description of the figures

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 schématique de coupe longitudinale d'un moteur.
  • la figure 2 est une vue schématique de coupe longitudinale d'une extrémité du moteur côté accouplement du moteur avec un agencement d'une came d'actionnement selon un mode de réalisation de l'invention.
  • la figure 3 est une vue schématique du volant d'inertie avec une came d'actionnement selon un mode de réalisation de l'invention.
  • la figure 4 est une vue schématique de coupe longitudinale d'une extrémité du moteur côté accouplement du moteur avec un agencement d'une came d'actionnement selon un autre mode de réalisation de l'invention.
  • la figure 5 est une vue schématique de coupe longitudinale d'une extrémité du moteur côté accouplement du moteur avec un agencement d'une came d'actionnement selon un autre mode de réalisation de l'invention.
Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows, for the understanding of which reference is made to the appended drawings in which:
  • the figure 1 is a schematic longitudinal sectional view of an engine.
  • the figure 2 is a schematic longitudinal sectional view of one end of the motor on the motor coupling side with an arrangement of an actuating cam according to an embodiment of the invention.
  • the figure 3 is a schematic view of the flywheel with an actuating cam according to one embodiment of the invention.
  • the figure 4 is a schematic longitudinal sectional view of one end of the motor on the motor coupling side with an arrangement of an actuating cam according to another embodiment of the invention.
  • the figure 5 is a schematic longitudinal sectional view of one end of the motor on the motor coupling side with an arrangement of an actuating cam according to another embodiment of the invention.

Description détaillée des figuresDetailed description of figures

Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the description which follows, identical reference numerals denote identical parts or having similar functions.

La description qui suit peut prendre en compte trois axes spatiaux qui sont la direction longitudinale X du moteur, la direction transversale Y coplanaire avec la direction longitudinale X selon un plan horizontal du véhicule passant par exemple par les essieux des roues du véhicule et une direction Z verticale dirigée vers le haut du véhicule. Il faut noter que la direction longitudinale X est par rapport au moteur thermique et de ce fait est orthogonale à la direction longitudinale du véhicule pour un moteur monté transversalement.The following description can take into account three spatial axes which are the longitudinal direction X of the engine, the transverse direction Y coplanar with the longitudinal direction X along a horizontal plane of the vehicle passing for example through the axles of the wheels of the vehicle and a direction Z vertical directed towards the top of the vehicle. It should be noted that the longitudinal direction X is relative to the heat engine and therefore is orthogonal to the longitudinal direction of the vehicle for an engine mounted transversely.

Dans la description qui suit, on distingue une face accessoires du moteur de laquelle débouche une première extrémité d'accessoires du vilebrequin autour de laquelle est montée au moins une roue (non représentée) pour entrainer en rotation des axes des éléments accessoires (non représentés) du moteur tels que la pompe à eau, et une face d'accouplement de laquelle débouche l'extrémité d'accouplement du vilebrequin diamétralement opposée à la première extrémité et connectée avec un volant d'inertie et une boite de vitesses (non représentée).In the following description, an accessory face of the engine can be distinguished from which opens a first accessory end of the crankshaft around which is mounted at least one wheel (not shown) for rotating the axes of the accessory elements (not shown). of the engine such as the water pump, and a coupling face from which opens the coupling end of the crankshaft diametrically opposite to the first end and connected with a flywheel and a gearbox (not shown).

De manière connue, selon la figure 1, un moteur thermique 10 ou à combustion interne de véhicule automobile comprend un carter-cylindres 11 comportant au moins un cylindre 12 dans lequel un piston (non représenté) est apte à coulisser en un mouvement de va-et-vient selon l'axe vertical Z dudit cylindre et une culasse (non représentée) recouvrant la partie supérieure du carter-cylindres tournée vers un capot de moteur du véhicule. Les mouvements du piston sont entrainés par une variation d'une chambre à combustion délimitée par la paroi 13 du au-moins un cylindre, ledit piston et la culasse. Le piston est lié à un vilebrequin 14 agencé selon un axe X sensiblement horizontal et orthogonal à l'axe vertical Z. Les mouvements de coulissement en va-et-vient du piston entraine un mouvement en rotation du vilebrequin. Les déplacements en coulissement du piston ne sont cependant pas effectués de manière régulière et produisent des acyclismes qui se répercutent sur des éléments de transmission reliés audit moteur 10 et particulièrement au vilebrequin.In known manner, according to figure 1 , a heat engine 10 or internal combustion of a motor vehicle comprises a cylinder block 11 comprising at least one cylinder 12 in which a piston (not shown) is able to slide in a reciprocating movement along the vertical axis Z of said cylinder and a cylinder head (not shown) covering the upper part of the cylinder block facing an engine hood of the vehicle. The movements of the piston are driven by a variation of a combustion chamber delimited by the wall 13 of the at least one cylinder, said piston and the cylinder head. The piston is linked to a crankshaft 14 arranged along an axis X that is substantially horizontal and orthogonal to the vertical axis Z. The reciprocating sliding movements of the piston cause a rotational movement of the crankshaft. The sliding movements of the piston are not, however, carried out in a regular manner and produce acyclisms which have repercussions on the transmission elements connected to said engine 10 and particularly to the crankshaft.

De ce fait un volant d'inertie 15 est connecté au vilebrequin entraîné par les pistons pour absorber les irrégularités du couple moteur et de réduire les acyclismes. Le volant d'inertie 15 est agencé de manière connue fixé à l'extrémité d'accouplement 16 du vilebrequin et connecté avec la boite de vitesses. La face du moteur tournée vers le volant d'inertie est dénommée face accouplement 17.Because of this a flywheel 15 is connected to the crankshaft driven by the pistons to absorb irregularities in engine torque and reduce acyclisms. The flywheel 15 is arranged in a known manner fixed to the coupling end 16 of the crankshaft and connected with the gearbox. The face of the motor facing the flywheel is referred to as the coupling face 17.

Une pompe à carburant (non représentée) est associée au moteur 10 pour injecter dans la chambre à combustion du carburant via des injecteurs par exemple. Cette pompe peut être une pompe haute pression comportant une tige tenant à une extrémité libre un galet d'entrainement en appui sur une surface d'entrainement, ladite surface présente des ondulations et est mobile, liée à la rotation du vilebrequin. Cette surface d'entrainement 19 est par exemple une surface périphérique d'une came 20 de forme sensiblement oblongue qui est fixée solidaire en rotation au vilebrequin autour de son axe de rotation qui est orthogonal au plan de la came et confondu avec l'axe du vilebrequin.A fuel pump (not shown) is associated with the engine 10 to inject fuel into the combustion chamber via injectors, for example. This pump may be a high pressure pump comprising a rod holding at a free end a drive roller resting on a drive surface, said surface has undulations and is mobile, linked to the rotation of the crankshaft. This drive surface 19 is for example a peripheral surface of a cam 20 of substantially oblong shape which is fixed in rotation to the crankshaft about its axis of rotation which is orthogonal to the plane of the cam and coincides with the axis of the crankshaft.

L'invention concerne un agencement de la pompe haute pression d'alimentation de carburant actionnée à l'aide d'une came d'actionnement 20 disposée à l'extrémité d'accouplement du vilebrequin tournée vers une face accouplement 17 du moteur et connectée à un volant d'inertie 15. Dans le reste de la description sans représentation de la pompe à carburant, ladite pompe à carburant est agencée radialement à l'axe de la came et comporte un piston en appui avec la surface périphérique de ladite came.The invention relates to an arrangement of the high pressure fuel supply pump actuated by means of an actuating cam 20 disposed at the coupling end of the crankshaft facing a coupling face 17 of the engine and connected to it. a flywheel 15. In the remainder of the description without representation of the fuel pump, said fuel pump is arranged radially to the axis of the cam and comprises a piston bearing against the peripheral surface of said cam.

Ladite pompe d'alimentation de carburant est agencée selon l'invention de manière orthogonale à l'axe X du vilebrequin et à l'extrémité d'accouplement 17' dudit vilebrequin 14.Said fuel feed pump is arranged according to the invention orthogonally to the X axis of the crankshaft and to the coupling end 17 'of said crankshaft 14.

Selon l'invention, le volant d'inertie 15 porte la came d'actionnement 20, ladite came est disposée en regard avec le vilebrequin c'est-à-dire que ladite came est montée fixée solidaire avec le volant d'inertie en rotation et en translation, du côté dudit volant tourné vers le vilebrequin 14.According to the invention, the flywheel 15 carries the actuating cam 20, said cam is arranged opposite the crankshaft, that is to say that said cam is mounted fixed integral with the rotating flywheel. and in translation, on the side of said flywheel facing the crankshaft 14.

Les figures 2 à 5 représentent des modes de réalisation de l'invention. On peut voir la came d'actionnement 20 de forme sensiblement tubulaire et présentant une section transversale sensiblement oblongue. La forme de ladite section transversale peut cependant être différente.The figures 2 to 5 represent embodiments of the invention. One can see the actuating cam 20 of substantially tubular shape and having a substantially oblong cross section. The shape of said cross section may however be different.

La came d'actionnement 20 comporte un orifice longitudinal sensiblement cylindrique 21 coaxial avec l'axe X de la came qui est adapté pour entourer l'extrémité d'accouplement 17' du vilebrequin. Ladite ouverture est prolongée selon l'axe X par un orifice traversant 22 qui permet le passage d'une vis de fixation pour solidariser le volant d'inertie 15 avec le vilebrequin 14.The actuating cam 20 has a substantially cylindrical longitudinal orifice 21 coaxial with the X axis of the cam which is adapted to surround the coupling end 17 'of the crankshaft. Said opening is extended along the X axis by a through orifice 22 which allows the passage of a fixing screw to secure the flywheel 15 with the crankshaft 14.

Ladite came 20 est fixée solidaire du volant d'inertie 15. Pour ce faire, ladite came comporte des orifices filetés obtenus par exemple par perçage parallèlement à l'axe X de came. Le volant comporte également des orifices traversant en vis-à-vis avec les orifices filetés de la came pour permettre une fixation de la came avec le volant grâce à des vis de fixation.Said cam 20 is fixed integral with the flywheel 15. To do this, said cam comprises threaded orifices obtained for example by drilling parallel to the cam axis X. The flywheel also has through holes in vis-à-vis the threaded holes of the cam to allow fixing of the cam with the flywheel by means of fixing screws.

Le volant d'inertie 15 est fixé de façon connue à l'extrémité d'accouplement 17' du vilebrequin de telle façon que la came 20 soit tournée vers le vilebrequin 14. La rotation du vilebrequin 14 entraine alors la rotation de la came 20 qui est apte à actionner le piston de la pompe à carburant.The flywheel 15 is fixed in a known manner to the coupling end 17 'of the crankshaft so that the cam 20 is turned towards the crankshaft 14. The rotation of the crankshaft 14 then causes the rotation of the cam 20 which is suitable for actuating the piston of the fuel pump.

Selon ce mode de réalisation, le carter-cylindres 11 comprend une paroi 23 délimitant une chambre d'accueil 24 pour loger la came d'actionnement ; ladite paroi prolonge le carter cylindre selon l'axe longitudinal X et elle comprend une ouverture radiale traversant (non représentée) selon un axe radial orthogonal à l'axe longitudinal X pour le passage du corps sensiblement cylindrique de la pompe à carburant. Ladite chambre d'accueil 24 est fermée de façon étanche grâce à des joints d'étanchéité 25. Lesdits joints d'étanchéités sont agencés des deux côtés selon l'axe longitudinal X de la came d'actionnement.According to this embodiment, the cylinder block 11 comprises a wall 23 delimiting a reception chamber 24 for housing the actuation cam; said wall extends the cylinder block along the longitudinal axis X and it comprises a radial opening passing through (not shown) along a radial axis orthogonal to the longitudinal axis X for the passage of the substantially cylindrical body of the fuel pump. Said reception chamber 24 is sealed by means of seals 25. Said seals are arranged on both sides along the longitudinal axis X of the actuating cam.

Le volant d'inertie 15 est monté fixé solidaire de l'extrémité d'accouplement 17' du vilebrequin 14. Selon les figures 2 et 3, l'orifice longitudinal 21 de la came 20 entoure l'extrémité d'accouplement 17' du vilebrequin 14 au jeu de montage près. La came est fixée par des liaisons filetées au volant d'inertie 14 ou à un disque formant ledit volant. La came est montée logée dans la chambre d'accueil 24. La pompe à carburant peut être fixée à la paroi 23 du carter-cylindres de manière à ce que son axe soit sensiblement orthogonal à l'axe X du vilebrequin 14, le corps de la pompe traverse l'ouverture radiale pratiquée dans la paroi 23 de la chambre d'accueil 24.The flywheel 15 is mounted fixed integral with the coupling end 17 'of the crankshaft 14. According to the figures 2 and 3 , the longitudinal orifice 21 of the cam 20 surrounds the coupling end 17 'of the crankshaft 14 except for the mounting clearance. The cam is fixed by threaded connections to the flywheel 14 or to a disc forming said flywheel. The cam is mounted housed in the reception chamber 24. The fuel pump can be fixed to the wall 23 of the cylinder block so that its axis is substantially orthogonal to the axis X of the crankshaft 14, the body of the cylinder. the pump passes through the radial opening made in the wall 23 of the reception chamber 24.

La chambre d'accueil 24 est délimitée par des joints d'étanchéité. Un premier joint 26 est disposé au niveau d'un palier de maintien 27 du vilebrequin et un second joint 28 sensiblement annulaire est agencé entre la paroi 23 du carter et la came de préférence à une extrémité longitudinale de la came en contact avec le volant d'inertie. Un conduit d'amenée (non représenté) de liquide de lubrification peut être creusé dans la paroi 23 du carter pour amener du liquide de lubrification vers la surface de contact de la came avec le piston de la pompe à carburant.The reception chamber 24 is delimited by seals. A first seal 26 is disposed at a retaining bearing 27 of the crankshaft and a second substantially annular seal 28 is arranged between the wall 23 of the housing and the cam preferably at a longitudinal end of the cam in contact with the flywheel. 'inertia. A supply duct (not shown) for lubricating liquid can be hollowed out in the wall 23 of the crankcase to bring lubricating liquid to the contact surface of the cam with the piston of the fuel pump.

Selon les figures 5 et 6, le volant d'inertie comporte une protubérance tubulaire 29 qui est montée entourant l'extrémité d'accouplement 17' du vilebrequin. Ladite protubérance 29 présente un évidement 30 sensiblement cylindrique complémentaire à l'extrémité d'accouplement 17' du vilebrequin au jeu de montage près. La protubérance porte la came d'actionnement 20 montée de telle façon que son axe de rotation soit confondu avec l'axe du volant. La came est montée de manière préférentielle par frettage ou par soudure entourant la protubérance tubulaire 29.According to figures 5 and 6, the flywheel has a tubular protuberance 29 which is mounted around the coupling end 17 'of the crankshaft. Said protuberance 29 has a substantially cylindrical recess 30 complementary to the coupling end 17 'of the crankshaft except for the mounting clearance. The protuberance carries the actuating cam 20 mounted in such a way that its axis of rotation coincides with the axis of the flywheel. The cam is preferably mounted by hooping or by welding surrounding the tubular protuberance 29.

La came d'actionnement 20 et la protubérance tubulaire 29 sont tournées vers le vilebrequin 14 de telle façon que l'extrémité d'accouplement 17' du vilebrequin soit enfoncée dans l'évidement 30 de ladite protubérance 29, la came 20 entoure alors ladite extrémité d'accouplement 17' du vilebrequin. Le volant d'inertie 15 est fixé à l'extrémité du vilebrequin grâce à la liaison filetée.The actuating cam 20 and the tubular protrusion 29 are turned towards the crankshaft 14 such that the coupling end 17 'of the crankshaft is pressed into the recess 30 of said protuberance 29, the cam 20 then surrounds said coupling end 17 'of the crankshaft. The flywheel 15 is fixed to the end of the crankshaft by means of the threaded connection.

Comme le mode de réalisation précédent, un premier joint 26 est disposé au niveau d'un palier de maintien 27 du vilebrequin et un second joint 28 sensiblement annulaire est agencé entre la paroi 23 du carter et une extrémité longitudinale de la came 20 en contact avec le volant d'inertie ou entre la paroi 23 et une extrémité longitudinale de la protubérance tubulaire à proximité d'un disque formant le volant d'inertie.Like the previous embodiment, a first seal 26 is arranged at a crankshaft retaining bearing 27 and a second substantially annular seal 28 is arranged between the wall 23 of the housing and a longitudinal end of the cam 20 in contact with it. the flywheel or between the wall 23 and a longitudinal end of the tubular protuberance near a disc forming the flywheel.

Selon un autre mode de réalisation selon la figure 6, la came d'actionnement 20 portée par la protubérance tubulaire 29 du volant d'inertie est logée directement dans une chambre de bielles 34 dans laquelle sont logés également au moins un maneton 31 et au moins un tourillon 32 formant le vilebrequin19. Le palier de maintien 27 du vilebrequin entoure dans ce cas la protubérance tubulaire 29 du volant d'inertie 15. La came d'actionnement 20 logée dans la chambre de bielles 34 bénéficie alors d'un brouillard d'huile envahissant ladite chambre de bielles lors du fonctionnement du moteur ce qui peut permettre d'éviter la création d'un conduit d'amenée de liquide de lubrification vers la surface de contact de la came d'actionnement 20 avec le piston de la pompe à carburant.According to another embodiment according to FIG. 6, the actuating cam 20 carried by the tubular protuberance 29 of the flywheel is housed directly in a chamber of connecting rods 34 in which are also housed at least one crank pin 31 and at least a journal 32 forming the crankshaft 19. The retaining bearing 27 of the crankshaft in this case surrounds the tubular protuberance 29 of the flywheel 15. The actuating cam 20 housed in the connecting rod chamber 34 then benefits from an oil mist invading said connecting rod chamber during of the operation of the engine, which can make it possible to avoid the creation of a duct for supplying lubricating liquid to the contact surface of the actuating cam 20 with the piston of the fuel pump.

L'objet de l'invention est atteint : l'agencement de pompe à carburant selon l'invention est peu impactant en encombrement du moteur thermique.The object of the invention has been achieved: the fuel pump arrangement according to the invention has little impact on the size of the heat engine.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cette prise, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes. C'est ainsi notamment que la came d'actionnement peut être intégrée au volant d'inertie ou partie dudit volant, sans que l'on sorte pour autant du cadre de l'invention.As goes without saying, the invention is not limited to the sole embodiments of this socket, described above by way of examples, it embraces on the contrary all the variants thereof. Thus, in particular, the actuating cam can be integrated into the flywheel or part of said flywheel, without thereby departing from the scope of the invention.

Claims (10)

  1. Arrangement of an actuating cam for a fuel pump at a coupling end (17') of the crankshaft (12) that faces the flywheel of an engine which comprises
    - a crankcase (10) comprising a crank chamber (11) delimited by a wall (15) having an orifice (16) surrounding the end (17') of a crankshaft (12) housed in said chamber,
    - and the flywheel (20) fixed in a rotationally locked manner with said end and arranged outside said chamber, said flywheel (20) comprising a tubular protuberance (29) designed to surround the end (17') of the crankshaft, said protuberance (29) of the flywheel leaving inside the chamber (11) through the circular orifice (16),
    characterized in that the actuating cam is borne by the tubular protuberance (29) and fixed to the flywheel.
  2. Arrangement according to Claim 1, characterized in that the cam is mounted surrounding the end of the crankshaft.
  3. Arrangement according to Claim 1 or 2, characterized in that the cam is mounted surrounding the protuberance by shrink-fitting or welding.
  4. Arrangement of an actuating cam according to any one of Claims 1 to 3, characterized in that the actuating cam is surrounded by the wall of the crankcase.
  5. Arrangement of an actuating cam according to any one of Claims 1 to 4, characterized in that the crankcase comprises a cavity extended radially to the axis of the crankshaft via an orifice, to house the fuel pump.
  6. Arrangement of an actuating cam according to any one of Claims 1 to 5, characterized in that the cam is housed in the crank chamber.
  7. Arrangement of an actuating cam according to any one of Claims 1 to 5, characterized in that the crankcase comprises a reception chamber separated from the crank chamber along the longitudinal axis of the crankcase to house the actuating cam.
  8. Arrangement of an actuating cam according to Claim 7, characterized in that the reception chamber is closed in a sealed manner by annular seals.
  9. Arrangement of an actuating cam according to Claim 8, characterized in that the cam bears a tightener seal.
  10. Motor vehicle combustion engine comprising a fuel pump arranged on the coupling side and actuated by an actuating cam arranged according to any one of Claims 1 to 9.
EP18160571.8A 2017-03-13 2018-03-07 Integration of the drive cam of the hp pump on the flywheel Active EP3379066B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1752025A FR3063773B1 (en) 2017-03-13 2017-03-13 INTEGRATION OF THE HP PUMP DRIVE CAM ON THE INERTIA FLYWHEEL

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EP3379066A1 EP3379066A1 (en) 2018-09-26
EP3379066B1 true EP3379066B1 (en) 2021-01-13

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EP18160571.8A Active EP3379066B1 (en) 2017-03-13 2018-03-07 Integration of the drive cam of the hp pump on the flywheel

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AP3411A (en) * 2008-09-29 2015-09-30 Tvs Motor Co Ltd System for driving a fuel pump
GB201207235D0 (en) * 2012-04-25 2012-06-06 Delphi Tech Holding Sarl Fuel pump assembly
FR2997133B1 (en) * 2012-10-24 2018-03-23 Renault S.A.S. CRANKSHAFT CONNECTION - CARTER-CYLINDERS
GB2540584A (en) * 2015-07-22 2017-01-25 Gm Global Tech Operations Llc Internal combustion engine comprising a fuel unit pump actuated by the crankshaft

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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FR3063773A1 (en) 2018-09-14
EP3379066A1 (en) 2018-09-26
FR3063773B1 (en) 2021-11-12

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