EP3132134A1 - Fuel injection pump having a component for blocking rotation and lubricating the plunger - Google Patents

Fuel injection pump having a component for blocking rotation and lubricating the plunger

Info

Publication number
EP3132134A1
EP3132134A1 EP15725722.1A EP15725722A EP3132134A1 EP 3132134 A1 EP3132134 A1 EP 3132134A1 EP 15725722 A EP15725722 A EP 15725722A EP 3132134 A1 EP3132134 A1 EP 3132134A1
Authority
EP
European Patent Office
Prior art keywords
pusher
injection pump
guiding
pusher body
cavity
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Withdrawn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
EP15725722.1A
Other languages
German (de)
French (fr)
Inventor
Xavier Durand
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP3132134A1 publication Critical patent/EP3132134A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip

Definitions

  • the invention relates to a fuel injection pump, particularly at high pressure, in the context of application related to an internal combustion engine, in particular for a motor vehicle engine.
  • the injection pump comprises on the one hand a pusher including a pusher body and a roller rotatably mounted on the pusher body and adapted to cooperate with a cam integral with a rotary shaft of the motor to induce a translational movement of the pusher, on the other hand a guiding casing guiding the pusher body during the translational movement of the pusher intended to be induced by the cam.
  • the invention also relates to a system, in particular an internal combustion engine or a motor vehicle, including such an injection pump.
  • the cam is integral with a camshaft or a crankshaft, or any other rotary shaft intended to ensure, among other things, an actuating function of the fuel pump. injection for the strategy of implementation and control of the fuel injection necessary for the operation of the internal combustion engine.
  • the guiding casing is formed by the cylinder block of the engine block or by a pump body attached to the engine block.
  • the fuel to be injected may in particular be gas oil, for example for use in the field of motor vehicles.
  • the pusher comprises at one end the roller, while its opposite end, in the direction in which the translational movement of the pusher back and forth, comprises elements dedicated to the pressurization of the fuel.
  • the rotational speed of the roller is important and it is necessary to provide effective lubrication of the bearing disposed between the roller and its mounting axis relative to the pusher body.
  • the injection pump must also include lubrication elements ensuring effective lubrication of the sliding contact between the guide housing and the pusher body and the mechanical contact between the cam and the roller.
  • it must comprise locking elements in rotation of the pusher body relative to the guide housing.
  • the object of the present invention is to provide an injection pump which overcomes the disadvantages listed above.
  • an object of the invention is to provide a fuel injection pump which is simple and compact, while being effective and robust. This object can be achieved by means of a fuel injection pump, in particular at high pressure, for an internal combustion engine, in particular an internal combustion engine of a motor vehicle, comprising on the one hand a pusher including a pusher body and a roller.
  • a guide housing guiding the pusher body during the translational movement a pusher intended to be induced by the cam, comprising a feed part of the inside of the guide casing in a lubricating fluid, said part being able to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the axis of translation according to which the displacement in translation of the pusher is practiced.
  • the piece blocks the pusher body in rotation regardless of the position occupied by the pusher during its movement in translation relative to the guide housing.
  • the part may comprise a first portion locally traversing the thickness of a wall of the guide casing to ensure fluid communication of the outside of the guide casing towards the inside of the guide casing for the lubricating fluid and a second part arranged. protruding from the guiding casing inside the guiding casing and penetrating at least partially into a cavity in the pusher body.
  • the cavity in the pusher body may be in the form of a groove or groove directed parallel to said translation axis.
  • the first part and the second part of the part internally delimit preferably a supply duct for the lubricating fluid opening towards the outside of the guiding casing and opening, at the level of the second part of the part, towards the inside of the the cavity formed in the pusher body, for ejecting the lubricating fluid supplied by the supply conduit at least partially in the cavity formed in the pusher body.
  • the cavity may be formed in an outer face for guiding the pusher body cooperating by sliding contact with an inner face for guiding the guide housing, the second part of the part being projecting with respect to the internal guiding face of the housing of guiding, so that the lubricant fluid supplied by the workpiece at least partially lubricates said internal and external guiding faces during their relative sliding.
  • the cavity in the pusher body may open into a chamber in which the pusher roll is disposed.
  • the injection pump may comprise feed elements making it possible to at least partially drive the lubricating fluid supplied inside the guide casing by the piece to an outer face of the roller intended to cooperate with the cam.
  • the feed elements may comprise a distribution channel pierced in the pusher body, opening into the cavity provided in the pusher body and opening at a contact interface between the outer face of the roller and the pusher body.
  • a system in particular an internal combustion engine or a motor vehicle, may then include such an injection pump.
  • FIG. 1 is a sectional view along the sectional plane A-A of FIG. 2 of an exemplary fuel injection pump according to the invention
  • FIG. 2 is a sectional view of the injection pump of Figure 1, along a cutting plane passing through the axis of translation of the pusher relative to the guide housing. Description of preferred modes of the invention
  • the injection pump comprises a pusher including a pusher body 10 and a roller 1 1 rotatably mounted on the pusher body, for example by means of an axis of rotation 12.
  • the roller 1 1 is adapted to cooperate with a cam (not shown) integral with a rotary shaft of the motor to induce a displacement in translation of the pusher.
  • the displacement of the pusher is of the round-trip type along a translation axis marked X along which the translational movement of the pusher is practiced.
  • the injection pump also comprises a guide casing 13 guiding the translation of the pusher body 10 during the displacement in translation of the pusher intended to be induced by the cam.
  • the axis of rotation 12 provides a degree of freedom in rotation of the roll 1 1 with respect to the pusher body 10 oriented perpendicularly to the translation axis X.
  • the invention also relates to any system including such an injection pump, this system may be in particular an internal combustion engine or a motor vehicle.
  • the displacement of the pusher resulting from the application of a force by the cam on the roller 1 1 is practiced in opposition to a return force oriented along the X axis applied by a spring 14 disposed in the guide housing 13, disposed the opposite side to the roller 1 1 relative to the pusher body 10 along the axis X.
  • the pusher thus comprises at a first end the roller 1 1, while its second end opposite the first end, along the translation axis X, comprises elements configured to ensure a pressure of the fuel (not shown) under the effect of displacement of the pusher.
  • high pressure preferably means in this document that the injection pressure of the fuel, which may in particular be gas oil, is for example of the order of 2000 bar.
  • the effort between the roll 1 1 and the cam is for example of the order of 10 KN for the case of a motor speed of 4000tr / min.
  • the cam is integral with a camshaft or a crankshaft, or any other rotary shaft intended to ensure, among other things, an actuating function of the injection pump for the implementation and control strategy of the injecting the fuel necessary for the operation of the internal combustion engine.
  • the fuel injection pump comprises a feed member from the interior of the guide housing 13 into a lubricating fluid.
  • This part 15 is adapted to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the translation axis X in which the translational movement of the pusher is practiced.
  • the piece 15 thus simultaneously provides the function of supplying the inside of the guiding casing 13 with lubricating fluid and the blocking function of the pusher body 10 in rotation with respect to the guiding casing 13 to eliminate the degree of freedom. in rotation of the pusher around the translation axis X.
  • the piece 15 may for example be in the form of a peg pierced from one side, a through cannula or any other equivalent form or at least adapted to the desired function. For attachment, it can in particular be fitted into the guide housing 13, although any other fastening means can be used.
  • the part 15 has the advantage of providing the two rotational locking and lubrication functions on the pusher in an integrated manner on the guide casing 13, which can be either a cylinder block of the engine block either a pump body in the case where the pump body is separate element of the engine block.
  • the piece 15 blocks the pusher body 10 in rotation regardless of the position occupied by the pusher during its movement in translation relative to the guide housing 13. This allows to mount and simplify the mounting of the pusher body 10 relative to the guide housing 13, only providing the part 15 for the rotational locking function.
  • the part 15 may comprise a first part locally traversing the thickness of a wall of the guide casing 13 to ensure fluid communication of the outside of the guide casing towards the inside of the guide casing for the lubricating fluid and a second a portion protruding from the guide casing 13 inside the guide casing 13 and penetrating at least partially into a cavity 16 formed in the pusher body 10.
  • the part 15 may also comprise a third portion disposed outside the guiding casing 13, especially in the extension of the first and second parts.
  • the first and second parts of the part 15 are offset relative to each other in a direction substantially or exactly perpendicular to the translation axis X, allowing an efficient supply of lubricating fluid from the inside of the guiding casing .
  • the cavity 16 makes it possible to form a lubrication gallery both for the sliding contact between the guiding casing 13 and the pusher body 10 and for the mechanical contact between the cam and the roller 11.
  • the cavity 16 formed in the pusher body 10 is in particular in the form of a groove or directed groove parallel to said translation axis X.
  • the cavity 16 may take any other form.
  • the first part and the second part mentioned above of the part 15 internally delimit a supply duct 17 for the lubricating fluid opening towards the outside of the guiding casing 13 and opening, at the level of the second part of the part 15, towards the inside of the cavity 16 formed in the pusher body 10.
  • the supply marked F of the supply duct 17 with lubricant fluid outside the guiding casing 13 can be obtained by any means and provides no application limitation.
  • the cavity 16 may be formed in an outer face for guiding the pusher body 10 cooperating by sliding contact with an inner face for guiding the guide casing 13, the second part of the part 15 projecting from the inner face of the guiding the guide casing 13, so that the lubricating fluid supplied by the part 15 at least partially lubricates these internal and external guiding faces during their relative sliding. This makes it possible to confer a lubrication function on the sliding contact zone between the pusher body 10 and the guide casing 13.
  • the cavity 16 formed in the pusher body 10 can also open into a chamber 18 in which the roller 1 1 of the pusher is arranged, in order to facilitate the distribution of lubricant fluid to the contact zone between the cam and the roller January 1.
  • the injection pump also comprises feed elements making it possible to at least partially drive the lubricant fluid supplied inside the guiding casing 13 by the component 15 to an outer face of the roller 1 1 designed to cooperate with the cam.
  • the feed elements may comprise a single distribution channel 19 pierced in the pusher body 10 so as to open on one side into the cavity 16 formed in the pusher body 10 and on the other side at a contact interface between the outer face of the roller 1 1 and the pusher body 10. This contributes to the distribution of lubricant fluid to the contact area between the cam and the roller 1 1.
  • the injection pump thus has the advantage of being simple, compact, efficient and robust.

Abstract

The fuel injection pump, notably a high-pressure fuel injection pump for an internal combustion engine, notably a motor vehicle internal combustion engine, comprises on the one hand, a plunger including a plunger body (10) and a roller (11) mounted to rotate on the plunger body (10) and able to collaborate with a cam secured to a rotary shaft of the engine so as to bring about a translational movement of the plunger, and on the other hand a guide housing (13) guiding the plunger body (10) during the translational movement of the plunger intended to be imparted by the cam. The pump comprises a component (15) for supplying the inside of the guide housing (13) with lubricant. The component (15) is able to collaborate with the plunger body in order to remove the degree of freedom of the plunger to rotate about the axis of translation (X) along which the translational movement of the plunger is effected.

Description

POMPE D'INJECTION DE CARBURANT A PIECE DE BLOCAGE EN ROTATION ET DE LUBRIFICATION DU POUSSOIR  FUEL INJECTION PUMP WITH ROTATION BLOCKING PIECE AND PUSH LUBRICATION
Domaine technique de l'invention Technical field of the invention
L'invention concerne une pompe d'injection de carburant, notamment à haute pression, dans le cadre d'application lié à un moteur à combustion interne, notamment pour un moteur de véhicule automobile. La pompe d'injection comprend d'une part un poussoir incluant un corps de poussoir et un rouleau monté à rotation sur le corps de poussoir et apte à coopérer avec une came solidaire d'un arbre rotatif du moteur pour induire un déplacement en translation du poussoir, d'autre part un carter de guidage guidant le corps de poussoir durant le déplacement en translation du poussoir destiné à être induit par la came. The invention relates to a fuel injection pump, particularly at high pressure, in the context of application related to an internal combustion engine, in particular for a motor vehicle engine. The injection pump comprises on the one hand a pusher including a pusher body and a roller rotatably mounted on the pusher body and adapted to cooperate with a cam integral with a rotary shaft of the motor to induce a translational movement of the pusher, on the other hand a guiding casing guiding the pusher body during the translational movement of the pusher intended to be induced by the cam.
L'invention a pour objet également un système, notamment un moteur à combustion interne ou un véhicule automobile, incluant une telle pompe d'injection. The invention also relates to a system, in particular an internal combustion engine or a motor vehicle, including such an injection pump.
État de la technique State of the art
Dans le domaine de telles pompes d'injection de carburant, la came est solidaire d'un arbre à came ou d'un vilebrequin, ou tout autre axe rotatif destiné à assurer, entre autres, une fonction d'actionnement de la pompe d'injection pour la stratégie de mise en œuvre et de pilotage de l'injection du carburant nécessaire au fonctionnement du moteur à combustion interne. Le carter de guidage est quant à lui formé par le carter cylindre du bloc moteur ou par un corps de pompe rapporté au bloc moteur. Le carburant à injecter peut notamment être du gasoil, par exemple à des fins d'utilisation dans le cadre du domaine des véhicules automobiles. In the field of such fuel injection pumps, the cam is integral with a camshaft or a crankshaft, or any other rotary shaft intended to ensure, among other things, an actuating function of the fuel pump. injection for the strategy of implementation and control of the fuel injection necessary for the operation of the internal combustion engine. The guiding casing is formed by the cylinder block of the engine block or by a pump body attached to the engine block. The fuel to be injected may in particular be gas oil, for example for use in the field of motor vehicles.
Le poussoir comprend à une première extrémité le rouleau, tandis que son extrémité opposée, suivant la direction dans laquelle se pratique le déplacement de translation aller-retour du poussoir, comprend des éléments dédiés à la mise en pression du carburant. The pusher comprises at one end the roller, while its opposite end, in the direction in which the translational movement of the pusher back and forth, comprises elements dedicated to the pressurization of the fuel.
La vitesse de rotation du rouleau est importante et il est nécessaire de prévoir une lubrification efficace du palier disposé entre le rouleau et son axe de montage relativement au corps de poussoir. Pour son fonctionnement, la pompe d'injection doit aussi comprendre des éléments de lubrification assurant une lubrification efficace du contact glissant entre le carter de guidage et le corps de poussoir et du contact mécanique entre la came et le rouleau. D'autre part, elle doit comprendre des éléments de blocage en rotation du corps de poussoir par rapport au carter de guidage. The rotational speed of the roller is important and it is necessary to provide effective lubrication of the bearing disposed between the roller and its mounting axis relative to the pusher body. For its operation, the injection pump must also include lubrication elements ensuring effective lubrication of the sliding contact between the guide housing and the pusher body and the mechanical contact between the cam and the roller. On the other hand, it must comprise locking elements in rotation of the pusher body relative to the guide housing.
Le document US20061 10273 décrit une solution dans laquelle la fonction de blocage en rotation du poussoir et la fonction de lubrification de ces deux zones nécessitent la mise en œuvre d'usinages spécifiques qui occupent un encombrement global important. The document US20061 10273 describes a solution in which the rotational locking function of the pusher and the lubrication function of these two areas require the implementation of specific machining which occupy a large overall footprint.
Objet de l'invention Object of the invention
Le but de la présente invention est de proposer une pompe d'injection qui remédie aux inconvénients listés ci-dessus. Notamment, un objet de l'invention est de fournir une pompe d'injection de carburant qui soit simple et peu encombrante, tout en étant efficace et robuste. Cet objet peut être atteint grâce à une pompe d'injection de carburant, notamment à haute pression, pour moteur à combustion interne, notamment moteur à combustion interne de véhicule automobile, comprenant d'une part un poussoir incluant un corps de poussoir et un rouleau monté à rotation sur le corps de poussoir et apte à coopérer avec une came solidaire d'un arbre rotatif du moteur pour induire un déplacement en translation du poussoir, d'autre part un carter de guidage guidant le corps de poussoir durant le déplacement en translation du poussoir destiné à être induit par la came, comprenant une pièce d'alimentation de l'intérieur du carter de guidage en un fluide lubrifiant, ladite pièce étant apte à coopérer avec le corps du poussoir pour supprimer le degré de liberté en rotation du poussoir autour de l'axe de translation suivant lequel le déplacement en translation du poussoir se pratique. Préférentiellement, la pièce bloque le corps de poussoir en rotation quelle que soit la position occupée par le poussoir durant son déplacement en translation par rapport au carter de guidage. The object of the present invention is to provide an injection pump which overcomes the disadvantages listed above. In particular, an object of the invention is to provide a fuel injection pump which is simple and compact, while being effective and robust. This object can be achieved by means of a fuel injection pump, in particular at high pressure, for an internal combustion engine, in particular an internal combustion engine of a motor vehicle, comprising on the one hand a pusher including a pusher body and a roller. rotatably mounted on the pusher body and adapted to cooperate with a cam integral with a rotary shaft of the motor to induce a displacement in translation of the pusher, on the other hand a guide housing guiding the pusher body during the translational movement a pusher intended to be induced by the cam, comprising a feed part of the inside of the guide casing in a lubricating fluid, said part being able to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the axis of translation according to which the displacement in translation of the pusher is practiced. Preferably, the piece blocks the pusher body in rotation regardless of the position occupied by the pusher during its movement in translation relative to the guide housing.
La pièce peut comprendre une première partie traversant localement l'épaisseur d'une paroi du carter de guidage pour assurer une communication fluidique de l'extérieur du carter de guidage vers l'intérieur du carter de guidage pour le fluide lubrifiant et une deuxième partie disposée en saillie du carter de guidage à l'intérieur du carter de guidage et pénétrant au moins partiellement dans une cavité ménagée dans le corps de poussoir. La cavité ménagée dans le corps de poussoir peut se présenter sous la forme d'une rainure ou d'une gorge dirigée parallèlement audit axe de translation. La première partie et la deuxième partie de la pièce délimitent intérieurement de préférence un conduit d'alimentation pour le fluide lubrifiant débouchant vers l'extérieur du carter de guidage et débouchant, au niveau de la deuxième partie de la pièce, vers l'intérieur de la cavité ménagée dans le corps de poussoir, permettant d'éjecter le fluide lubrifiant amené par le conduit d'alimentation au moins partiellement dans la cavité ménagée dans le corps de poussoir. The part may comprise a first portion locally traversing the thickness of a wall of the guide casing to ensure fluid communication of the outside of the guide casing towards the inside of the guide casing for the lubricating fluid and a second part arranged. protruding from the guiding casing inside the guiding casing and penetrating at least partially into a cavity in the pusher body. The cavity in the pusher body may be in the form of a groove or groove directed parallel to said translation axis. The first part and the second part of the part internally delimit preferably a supply duct for the lubricating fluid opening towards the outside of the guiding casing and opening, at the level of the second part of the part, towards the inside of the the cavity formed in the pusher body, for ejecting the lubricating fluid supplied by the supply conduit at least partially in the cavity formed in the pusher body.
La cavité peut être ménagée dans une face externe de guidage du corps de poussoir coopérant par contact glissant avec une face interne de guidage du carter de guidage, la deuxième partie de la pièce étant en saillie par rapport à la face interne de guidage du carter de guidage, de sorte que le fluide lubrifiant alimenté par la pièce lubrifie au moins partiellement lesdites faces interne et externe de guidage durant leur glissement relatif. The cavity may be formed in an outer face for guiding the pusher body cooperating by sliding contact with an inner face for guiding the guide housing, the second part of the part being projecting with respect to the internal guiding face of the housing of guiding, so that the lubricant fluid supplied by the workpiece at least partially lubricates said internal and external guiding faces during their relative sliding.
La cavité ménagée dans le corps de poussoir peut déboucher dans une chambre dans laquelle le rouleau du poussoir est disposé. The cavity in the pusher body may open into a chamber in which the pusher roll is disposed.
La pompe d'injection peut comprendre des éléments d'amenée permettant de conduire au moins partiellement le fluide lubrifiant alimenté à l'intérieur du carter de guidage par la pièce jusqu'à une face extérieure du rouleau destinée à coopérer avec la came. The injection pump may comprise feed elements making it possible to at least partially drive the lubricating fluid supplied inside the guide casing by the piece to an outer face of the roller intended to cooperate with the cam.
Les éléments d'amenée peuvent comprendre un canal de distribution percé dans le corps de poussoir, débouchant dans la cavité ménagée dans le corps de poussoir et débouchant au niveau d'une interface de contact entre la face extérieure du rouleau et le corps de poussoir. The feed elements may comprise a distribution channel pierced in the pusher body, opening into the cavity provided in the pusher body and opening at a contact interface between the outer face of the roller and the pusher body.
Un système, notamment un moteur à combustion interne ou un véhicule automobile, pourra ensuite inclure une telle pompe d'injection. A system, in particular an internal combustion engine or a motor vehicle, may then include such an injection pump.
Description sommaire des dessins Brief description of the drawings
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés sur les dessins annexés, dans lesquels : Other advantages and features will emerge more clearly from the following description of particular embodiments of the invention given as non-restrictive examples and shown in the accompanying drawings, in which:
- la figure 1 est une vue en coupe, suivant le plan de coupe A-A de la figure 2, d'un exemple de pompe d'injection de carburant selon l'invention,  FIG. 1 is a sectional view along the sectional plane A-A of FIG. 2 of an exemplary fuel injection pump according to the invention,
- la figure 2 est une vue en coupe de la pompe d'injection de la figure 1 , suivant un plan de coupe passant par l'axe de translation du poussoir par rapport au carter de guidage. Description de modes préférentiels de l'invention  - Figure 2 is a sectional view of the injection pump of Figure 1, along a cutting plane passing through the axis of translation of the pusher relative to the guide housing. Description of preferred modes of the invention
En référence aux figures 1 et 2 annexées, l'invention qui va être décrite ci-dessous concerne une pompe d'injection de carburant représentée partiellement. Il s'agit notamment d'une pompe d'injection dite « à haute pression ». Elle est destinée à être utilisée dans le cadre de l'alimentation en carburant d'un moteur à combustion interne, notamment d'un moteur à combustion interne de véhicule automobile. With reference to Figures 1 and 2 attached, the invention will be described below relates to a fuel injection pump partially shown. These include an injection pump called "high pressure". It is intended for use in the fuel supply of an internal combustion engine, including an internal combustion engine of a motor vehicle.
La pompe d'injection comprend un poussoir incluant un corps de poussoir 10 et un rouleau 1 1 monté à rotation sur le corps de poussoir, par exemple par l'intermédiaire d'un axe de rotation 12. Le rouleau 1 1 est apte à coopérer avec une came (non représentée) solidaire d'un arbre rotatif du moteur pour induire un déplacement en translation du poussoir. Le déplacement du poussoir est de type aller-retour le long d'un axe de translation noté X suivant lequel le déplacement en translation du poussoir se pratique. La pompe d'injection comprend aussi un carter de guidage 13 guidant la translation du corps de poussoir 10 durant le déplacement en translation du poussoir destiné à être induit par la came. L'axe de rotation 12 assure un degré de liberté en rotation du rouleau 1 1 par rapport au corps de poussoir 10 orienté perpendiculairement à l'axe de translation X. The injection pump comprises a pusher including a pusher body 10 and a roller 1 1 rotatably mounted on the pusher body, for example by means of an axis of rotation 12. The roller 1 1 is adapted to cooperate with a cam (not shown) integral with a rotary shaft of the motor to induce a displacement in translation of the pusher. The displacement of the pusher is of the round-trip type along a translation axis marked X along which the translational movement of the pusher is practiced. The injection pump also comprises a guide casing 13 guiding the translation of the pusher body 10 during the displacement in translation of the pusher intended to be induced by the cam. The axis of rotation 12 provides a degree of freedom in rotation of the roll 1 1 with respect to the pusher body 10 oriented perpendicularly to the translation axis X.
L'invention concerne aussi tout système incluant une telle pompe d'injection, ce système pouvant être notamment un moteur à combustion interne ou un véhicule automobile. The invention also relates to any system including such an injection pump, this system may be in particular an internal combustion engine or a motor vehicle.
Le déplacement du poussoir résultant de l'application d'un effort par la came sur le rouleau 1 1 se pratique en opposition à un effort de rappel orienté selon l'axe X appliqué par un ressort 14 disposé dans le carter de guidage 13, disposé du côté opposé au rouleau 1 1 par rapport au corps de poussoir 10 selon l'axe X. The displacement of the pusher resulting from the application of a force by the cam on the roller 1 1 is practiced in opposition to a return force oriented along the X axis applied by a spring 14 disposed in the guide housing 13, disposed the opposite side to the roller 1 1 relative to the pusher body 10 along the axis X.
Le poussoir comprend donc à une première extrémité le rouleau 1 1 , tandis que sa deuxième extrémité opposée à la première extrémité, suivant l'axe de translation X, comprend des éléments configurés pour assurer une mise en pression du carburant (non représentés) sous l'effet de déplacement du poussoir. The pusher thus comprises at a first end the roller 1 1, while its second end opposite the first end, along the translation axis X, comprises elements configured to ensure a pressure of the fuel (not shown) under the effect of displacement of the pusher.
Le terme « haute pression » signifie de préférence dans ce document que la pression d'injection du carburant, qui peut notamment être du gasoil, est par exemple de l'ordre 2000 bars. L'effort entre le rouleau 1 1 et la came est par exemple de l'ordre de 10 KN pour le cas d'un régime moteur de 4000tr/min. The term "high pressure" preferably means in this document that the injection pressure of the fuel, which may in particular be gas oil, is for example of the order of 2000 bar. The effort between the roll 1 1 and the cam is for example of the order of 10 KN for the case of a motor speed of 4000tr / min.
La came est solidaire d'un arbre à came ou d'un vilebrequin, ou tout autre axe rotatif destiné à assurer, entre autres, une fonction d'actionnement de la pompe d'injection pour la stratégie de mise en œuvre et de pilotage de l'injection du carburant nécessaire au fonctionnement du moteur à combustion interne. De manière essentielle, la pompe d'injection de carburant comprend une pièce 15 d'alimentation de l'intérieur du carter de guidage 13 en un fluide lubrifiant. Cette pièce 15 est apte à coopérer avec le corps du poussoir pour supprimer le degré de liberté en rotation du poussoir autour de l'axe de translation X suivant lequel le déplacement en translation du poussoir se pratique. La pièce 15 assure donc en même temps la fonction d'alimentation de l'intérieur du carter de guidage 13 en fluide lubrifiant et la fonction de blocage du corps de poussoir 10 en rotation par rapport au carter de guidage 13 pour supprimer le degré de liberté en rotation du poussoir autour de l'axe de translation X. The cam is integral with a camshaft or a crankshaft, or any other rotary shaft intended to ensure, among other things, an actuating function of the injection pump for the implementation and control strategy of the injecting the fuel necessary for the operation of the internal combustion engine. Essentially, the fuel injection pump comprises a feed member from the interior of the guide housing 13 into a lubricating fluid. This part 15 is adapted to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the translation axis X in which the translational movement of the pusher is practiced. The piece 15 thus simultaneously provides the function of supplying the inside of the guiding casing 13 with lubricating fluid and the blocking function of the pusher body 10 in rotation with respect to the guiding casing 13 to eliminate the degree of freedom. in rotation of the pusher around the translation axis X.
La pièce 15 peut par exemple se présenter sous la forme d'un pion percé de part en part, d'une canule traversante ou de toute autre forme équivalente ou pour le moins adaptée à la fonction recherchée. Pour sa fixation, elle peut notamment être emmanchée dans le carter de guidage 13, bien que tout autre moyen de fixation puisse être utilisé. The piece 15 may for example be in the form of a peg pierced from one side, a through cannula or any other equivalent form or at least adapted to the desired function. For attachment, it can in particular be fitted into the guide housing 13, although any other fastening means can be used.
Dans tous les cas, la pièce 15 présente l'avantage d'apporter les deux fonctions de blocage en rotation et de lubrification sur le poussoir d'une manière intégrée sur le carter de guidage 13, qui peut être soit un carter cylindre du bloc moteur soit un corps de pompe dans le cas où le corps de pompe est élément séparé du bloc moteur. De préférence, la pièce 15 bloque le corps de poussoir 10 en rotation quelle que soit la position occupée par le poussoir durant son déplacement en translation par rapport au carter de guidage 13. Ceci permet de monter et de simplifier le montage du corps de poussoir 10 par rapport au carter de guidage 13, en ne prévoyant que la pièce 15 pour la fonction de blocage en rotation. In any case, the part 15 has the advantage of providing the two rotational locking and lubrication functions on the pusher in an integrated manner on the guide casing 13, which can be either a cylinder block of the engine block either a pump body in the case where the pump body is separate element of the engine block. Preferably, the piece 15 blocks the pusher body 10 in rotation regardless of the position occupied by the pusher during its movement in translation relative to the guide housing 13. This allows to mount and simplify the mounting of the pusher body 10 relative to the guide housing 13, only providing the part 15 for the rotational locking function.
La pièce 15 peut comprendre une première partie traversant localement l'épaisseur d'une paroi du carter de guidage 13 pour assurer une communication fluidique de l'extérieur du carter de guidage vers l'intérieur du carter de guidage pour le fluide lubrifiant et une deuxième partie disposée en saillie du carter de guidage 13 à l'intérieur du carter de guidage 13 et pénétrant au moins partiellement dans une cavité 16 ménagée dans le corps de poussoir 10. La pièce 15 peut aussi comprendre une troisième partie disposée à l'extérieur du carter de guidage 13, notamment dans le prolongement des première et deuxième parties. Les première et deuxième parties de la pièce 15 sont décalées l'une par rapport à l'autre suivant une direction sensiblement ou exactement perpendiculaire à l'axe de translation X, permettant une alimentation efficace en fluide lubrifiant de l'intérieur du carter de guidage. II résulte des dispositions précédentes que la cavité 16 permet de former une galerie de lubrification à la fois pour le contact glissant entre le carter de guidage 13 et le corps de poussoir 10 et pour le contact mécanique entre la came et le rouleau 1 1 . La cavité 16 ménagée dans le corps de poussoir 10 se présente notamment sous la forme d'une rainure ou d'une gorge dirigée parallèlement audit axe de translation X. Toutefois, la cavité 16 peut prendre toute autre forme. The part 15 may comprise a first part locally traversing the thickness of a wall of the guide casing 13 to ensure fluid communication of the outside of the guide casing towards the inside of the guide casing for the lubricating fluid and a second a portion protruding from the guide casing 13 inside the guide casing 13 and penetrating at least partially into a cavity 16 formed in the pusher body 10. The part 15 may also comprise a third portion disposed outside the guiding casing 13, especially in the extension of the first and second parts. The first and second parts of the part 15 are offset relative to each other in a direction substantially or exactly perpendicular to the translation axis X, allowing an efficient supply of lubricating fluid from the inside of the guiding casing . As a result of the preceding provisions, the cavity 16 makes it possible to form a lubrication gallery both for the sliding contact between the guiding casing 13 and the pusher body 10 and for the mechanical contact between the cam and the roller 11. The cavity 16 formed in the pusher body 10 is in particular in the form of a groove or directed groove parallel to said translation axis X. However, the cavity 16 may take any other form.
Préférentiellement, la première partie et la deuxième partie mentionnées ci-dessus de la pièce 15 délimitent intérieurement un conduit d'alimentation 17 pour le fluide lubrifiant débouchant vers l'extérieur du carter de guidage 13 et débouchant, au niveau de la deuxième partie de la pièce 15, vers l'intérieur de la cavité 16 ménagée dans le corps de poussoir 10. Ceci permet d'éjecter le fluide lubrifiant amené par le conduit d'alimentation 17 au moins partiellement dans la cavité 16 ménagée dans le corps de poussoir 10. Preferably, the first part and the second part mentioned above of the part 15 internally delimit a supply duct 17 for the lubricating fluid opening towards the outside of the guiding casing 13 and opening, at the level of the second part of the part 15, towards the inside of the cavity 16 formed in the pusher body 10. This makes it possible to eject the lubricating fluid brought by the supply conduit 17 at least partially into the cavity 16 formed in the pusher body 10.
L'alimentation notée F du conduit d'alimentation 17 en fluide lubrifiant à l'extérieur du carter de guidage 13 peut être obtenue par tout moyen et n'apporte aucune limitation d'application. The supply marked F of the supply duct 17 with lubricant fluid outside the guiding casing 13 can be obtained by any means and provides no application limitation.
La cavité 16 peut être ménagée dans une face externe de guidage du corps de poussoir 10 coopérant par contact glissant avec une face interne de guidage du carter de guidage 13, la deuxième partie de la pièce 15 étant en saillie par rapport à la face interne de guidage du carter de guidage 13, de sorte que le fluide lubrifiant alimenté par la pièce 15 lubrifie au moins partiellement ces faces interne et externe de guidage durant leur glissement relatif. Ceci permet de conférer une fonction de lubrification de la zone de contact glissant entre le corps de poussoir 10 et le carter de guidage 13. The cavity 16 may be formed in an outer face for guiding the pusher body 10 cooperating by sliding contact with an inner face for guiding the guide casing 13, the second part of the part 15 projecting from the inner face of the guiding the guide casing 13, so that the lubricating fluid supplied by the part 15 at least partially lubricates these internal and external guiding faces during their relative sliding. This makes it possible to confer a lubrication function on the sliding contact zone between the pusher body 10 and the guide casing 13.
La cavité 16 ménagée dans le corps de poussoir 10 peut aussi déboucher dans une chambre 18 dans laquelle le rouleau 1 1 du poussoir est disposé, afin de faciliter la distribution en fluide lubrifiant vers la zone de contact entre la came et le rouleau 1 1 . Préférentiellement, la pompe d'injection comprend également des éléments d'amenée permettant de conduire au moins partiellement le fluide lubrifiant alimenté à l'intérieur du carter de guidage 13 par la pièce 15 jusqu'à une face extérieure du rouleau 1 1 destinée à coopérer avec la came. Les éléments d'amenée dont la nature peut être quelconque peuvent comprendre un simple canal de distribution 19 percé dans le corps de poussoir 10 de sorte à déboucher d'un côté dans la cavité 16 ménagée dans le corps de poussoir 10 et de l'autre côté au niveau d'une interface de contact entre la face extérieure du rouleau 1 1 et le corps de poussoir 10. Cela contribue à la distribution en fluide lubrifiant vers la zone de contact entre la came et le rouleau 1 1 . The cavity 16 formed in the pusher body 10 can also open into a chamber 18 in which the roller 1 1 of the pusher is arranged, in order to facilitate the distribution of lubricant fluid to the contact zone between the cam and the roller January 1. Preferably, the injection pump also comprises feed elements making it possible to at least partially drive the lubricant fluid supplied inside the guiding casing 13 by the component 15 to an outer face of the roller 1 1 designed to cooperate with the cam. The feed elements, the nature of which may be arbitrary, may comprise a single distribution channel 19 pierced in the pusher body 10 so as to open on one side into the cavity 16 formed in the pusher body 10 and on the other side at a contact interface between the outer face of the roller 1 1 and the pusher body 10. This contributes to the distribution of lubricant fluid to the contact area between the cam and the roller 1 1.
La pompe d'injection présente donc l'avantage d'être simple, peu encombrante, efficace et robuste. The injection pump thus has the advantage of being simple, compact, efficient and robust.

Claims

REVENDICATIONS
1 . Pompe d'injection de carburant, notamment à haute pression, pour moteur à combustion interne, notamment moteur à combustion interne de véhicule automobile, comprenant d'une part un poussoir incluant un corps de poussoir (10) et un rouleau (1 1 ) monté à rotation sur le corps de poussoir (10) et apte à coopérer avec une came solidaire d'un arbre rotatif du moteur pour induire un déplacement en translation du poussoir, d'autre part un carter de guidage (13) guidant le corps de poussoir (10) durant le déplacement en translation du poussoir destiné à être induit par la came, caractérisée en ce qu'elle comprend une pièce (15) d'alimentation de l'intérieur du carter de guidage (13) en un fluide lubrifiant, ladite pièce (15) étant apte à coopérer avec le corps du poussoir pour supprimer le degré de liberté en rotation du poussoir autour de l'axe de translation (X) suivant lequel le déplacement en translation du poussoir se pratique. 1. Fuel injection pump, in particular at high pressure, for an internal combustion engine, especially an internal combustion engine of a motor vehicle, comprising on the one hand a pusher including a pusher body (10) and a roller (1 1) mounted with rotation on the pusher body (10) and adapted to cooperate with a cam integral with a rotary shaft of the motor to induce a displacement in translation of the pusher, on the other hand a guide casing (13) guiding the pusher body (10) during the displacement in translation of the pusher intended to be induced by the cam, characterized in that it comprises a part (15) for supplying the inside of the guiding casing (13) with a lubricating fluid, said piece (15) being adapted to cooperate with the body of the pusher to eliminate the degree of freedom in rotation of the pusher around the translation axis (X) in which the translational movement of the pusher is practiced.
2. Pompe d'injection selon la revendication 1 , caractérisée en ce que la pièce (15) bloque le corps de poussoir (10) en rotation quelle que soit la position occupée par le poussoir durant son déplacement en translation par rapport au carter de guidage (13). 2. Injection pump according to claim 1, characterized in that the piece (15) blocks the pusher body (10) in rotation regardless of the position occupied by the pusher during its displacement in translation relative to the guide housing (13).
3. Pompe d'injection selon l'une des revendications 1 ou 2, caractérisée en ce que la pièce (15) comprend une première partie traversant localement l'épaisseur d'une paroi du carter de guidage (13) pour assurer une communication fluidique de l'extérieur du carter de guidage (13) vers l'intérieur du carter de guidage (13) pour le fluide lubrifiant et une deuxième partie disposée en saillie du carter de guidage (13) à l'intérieur du carter de guidage (13) et pénétrant au moins partiellement dans une cavité (16) ménagée dans le corps de poussoir (10). 3. Injection pump according to one of claims 1 or 2, characterized in that the part (15) comprises a first part locally passing through the thickness of a wall of the guide housing (13) to ensure fluid communication from outside the guiding casing (13) towards the inside of the guiding casing (13) for the lubricating fluid and a second part protruding from the guiding casing (13) inside the guiding casing (13). ) and penetrating at least partially in a cavity (16) formed in the pusher body (10).
4. Pompe d'injection selon la revendication 3, caractérisée en ce que la cavité (16) ménagée dans le corps de poussoir (10) se présente sous la forme d'une rainure ou d'une gorge dirigée parallèlement audit axe de translation (X). Injection pump according to claim 3, characterized in that the cavity (16) formed in the pusher body (10) is in the form of a groove or groove directed parallel to said translation axis ( X).
5. Pompe d'injection selon l'une des revendications 3 ou 4, caractérisée en ce que la première partie et la deuxième partie de la pièce (15) délimitent intérieurement un conduit d'alimentation (17) pour le fluide lubrifiant débouchant vers l'extérieur du carter de guidage (13) et débouchant, au niveau de la deuxième partie de la pièce (15), vers l'intérieur de la cavité (16) ménagée dans le corps de poussoir (10), permettant d'éjecter le fluide lubrifiant amené par le conduit d'alimentation (17) au moins partiellement dans la cavité (16) ménagée dans le corps de poussoir (10). 5. Injection pump according to one of claims 3 or 4, characterized in that the first portion and the second portion of the piece (15) internally delimit a supply duct (17) for the lubricant fluid opening to the outside the guiding casing (13) and opening, at the level of the second part of the part (15), towards the inside of the cavity (16) formed in the pusher body (10), making it possible to eject the lubricant fluid supplied by the supply conduit (17) at least partially into the cavity (16) in the pusher body (10).
6. Pompe d'injection selon l'une des revendications 3 à 5, caractérisée en ce que la cavité (16) est ménagée dans une face externe de guidage du corps de poussoir (10) coopérant par contact glissant avec une face interne de guidage du carter de guidage (13), la deuxième partie de la pièce (15) étant en saillie par rapport à la face interne de guidage du carter de guidage (15), de sorte que le fluide lubrifiant alimenté par la pièce (15) lubrifie au moins partiellement lesdites faces interne et externe de guidage durant leur glissement relatif. 6. Injection pump according to one of claims 3 to 5, characterized in that the cavity (16) is formed in an outer face for guiding the pusher body (10) cooperating by sliding contact with an inner guide face. the guiding casing (13), the second part of the piece (15) projecting from the inner guiding surface of the guiding casing (15), so that the lubricating fluid supplied by the piece (15) lubricates at least partially said inner and outer guiding faces during their relative sliding.
7. Pompe d'injection selon l'une des revendications 3 à 6, caractérisée en ce que la cavité (16) ménagée dans le corps de poussoir (10) débouche dans une chambre (18) dans laquelle le rouleau (1 1 ) du poussoir est disposé. Injection pump according to one of claims 3 to 6, characterized in that the cavity (16) formed in the pusher body (10) opens into a chamber (18) in which the roller (1 1) of the pusher is disposed.
8. Pompe d'injection selon l'une des revendications 1 à 7, caractérisée en ce qu'elle comprend des éléments d'amenée permettant de conduire au moins partiellement le fluide lubrifiant alimenté à l'intérieur du carter de guidage (13) par la pièce (15) jusqu'à une face extérieure du rouleau (1 1 ) destinée à coopérer avec la came. 8. Injection pump according to one of claims 1 to 7, characterized in that it comprises feed elements for driving at least partially the lubricant fluid supplied to the inside of the guide housing (13) by the piece (15) to an outer face of the roller (1 1) intended to cooperate with the cam.
9. Pompe d'injection selon la revendication 8 et l'une des revendications 3 à 7, caractérisée en ce que les éléments d'amenée comprennent un canal de distribution (19) percé dans le corps de poussoir (10), débouchant dans la cavité (16) ménagée dans le corps de poussoir (10) et débouchant au niveau d'une interface de contact entre la face extérieure du rouleau (1 1 ) et le corps de poussoir (10). 9. Injection pump according to claim 8 and one of claims 3 to 7, characterized in that the feed elements comprise a distribution channel (19) pierced in the pusher body (10), opening into the cavity (16) formed in the pusher body (10) and opening at a contact interface between the outer face of the roller (1 1) and the pusher body (10).
10. Système, notamment moteur à combustion interne ou véhicule automobile, incluant une pompe d'injection selon l'une des revendications précédentes. 10. System, in particular an internal combustion engine or a motor vehicle, including an injection pump according to one of the preceding claims.
EP15725722.1A 2014-04-18 2015-04-09 Fuel injection pump having a component for blocking rotation and lubricating the plunger Withdrawn EP3132134A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1453549A FR3020095B1 (en) 2014-04-18 2014-04-18 FUEL INJECTION PUMP WITH ROTATION BLOCKING PIECE AND PUSH LUBRICATION
PCT/FR2015/050944 WO2015158994A1 (en) 2014-04-18 2015-04-09 Fuel injection pump having a component for blocking rotation and lubricating the plunger

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FR3134150A1 (en) * 2022-03-29 2023-10-06 Renault S.A.S Method for lubricating an interface between a piston of a pump and a shaft and system implementing such a method

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