EP3216993A1 - Piston cooling nozzle - Google Patents

Piston cooling nozzle Download PDF

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Publication number
EP3216993A1
EP3216993A1 EP17157524.4A EP17157524A EP3216993A1 EP 3216993 A1 EP3216993 A1 EP 3216993A1 EP 17157524 A EP17157524 A EP 17157524A EP 3216993 A1 EP3216993 A1 EP 3216993A1
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EP
European Patent Office
Prior art keywords
nozzle
fluid
cylindrical chamber
axis
outlet opening
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Granted
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EP17157524.4A
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German (de)
French (fr)
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EP3216993B1 (en
Inventor
Stephane Ruby
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Renault SAS
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Renault SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity

Definitions

  • the present invention relates to internal combustion engines.
  • the present invention relates in particular to piston cooling of an internal combustion engine.
  • the present invention relates more particularly to a cooling nozzle comprising a valve allowing a jet of cooling fluid from a temperature threshold and from a pressure threshold.
  • Internal combustion engines comprise in known manner a cylinder block surmounted by a cylinder head to surround cylindrical barrels in which pistons slide in a reciprocating motion. Said pistons delimit with the wall of the cylindrical shaft and the cylinder head a combustion chamber in which are injected air consisting of fresh air and possibly burnt gases and fuel. The volume of said combustion chamber varies according to the movement of the piston with a reduction causing a compression of the gases contained in said chamber followed by an explosion / combustion to push said piston down the crankcase.
  • the pistons are thus brought to a very high temperature and require cooling by fluid which is generally oil.
  • Piston cooling nozzles for an internal combustion engine are used to project the cooling fluid against the piston bottom, that is to say against the face of a piston vault external to the explosion chamber.
  • the piston cooling nozzles are elements fixed on the crankcase and comprising on the one hand a cooling fluid supply orifice and on the other hand an outlet orifice connected with a jet duct directed towards the engine crankcase. the piston vault.
  • the position of the jet as well as the The shape of the jet duct must be accurately determined to accurately determine the impact of the coolant jet on the piston vault.
  • the piston nozzle permits a jet of coolant towards the piston vault under pressure and temperature conditions of said fluid.
  • the publication FR2866386 discloses a piston cooling nozzle having a cylindrical member slidable in a cylindrical chamber depending on the temperature and the pressure of the cooling fluid pressing a shape memory membrane.
  • Said membrane has particular characteristics that can lead to significant costs in the production of said nozzle.
  • the temperature and pressure thresholds are characteristics of the single membrane, which can make it difficult to focus.
  • the object of the invention is to remedy these problems and one of the objects of the invention is a piston cooling nozzle capable of allowing a jet of said fluid towards a heat engine piston vault according to temperature and temperature thresholds. according to the pressure of said fluid, said temperature and pressure thresholds being independently adjustable.
  • the cooling fluid nozzle comprises a shutter valve of an outlet opening of said fluid, said valve being movable in plane rotation on a plane of rotation orthogonal to the axis of the cylindrical chamber.
  • the rotation can thus be performed simply to release or close the outlet opening according to the temperature level of the cooling fluid.
  • the outlet opening is pierced radially with respect to the cylindrical chamber so that the shut-off valve has a shape that is adjusted and complementary to the wall of the cylindrical chamber to easily seal said fluid outlet opening.
  • the platform carries the shutter valve of the movable outlet opening in rotation around the longitudinal axis of the cylindrical chamber.
  • the adjustment of the operation of the valve according to the pressure is a calibration of the elastic means pushing the platform towards the first receiving part of the cylindrical chamber.
  • a permanent flow of the cooling fluid is maintained in a minimal amount to ensure the operation of the valve on the one hand according to the temperature of the fluid in contact with the elastic element reacting to the temperature and on the other hand according to the pressure said fluid avoiding excessive forces opposing the sliding of the platform.
  • the nozzle comprises the shut-off valve which is capable of performing a first type of displacement as a function of the temperature of said fluid and a second type of displacement as a function of the pressure of the cooling fluid, the second type being different. of the first type, to allow the passage of fluid through said outlet opening from a first temperature threshold and from a second pressure threshold, which simplifies the development of said nozzle.
  • the operation of the nozzle is independent of the characteristics of a single activation element of the valve.
  • the engines of motor vehicles include a cylinder head mounted on a crankcase to surround cylindrical barrels in which slide in a movement back and forth pistons.
  • the piston delimits with the wall of the cylindrical shaft in the crankcase and the cylinder head a combustion chamber in which air is injected with possibly recycled burnt gases and fuel.
  • the volume of said chamber is then reduced by the sliding of the piston towards the cylinder head causing the compression of the gases before an explosion phase or combustion of said gas which has the effect of pushing said piston down the engine in the direction opposite to the cylinder head.
  • Said combustion results in an increase in the temperature of at least the elements surrounding said combustion chamber including the piston.
  • cooling elements are arranged in the engine and one of these elements is a piston nozzle.
  • said nozzle comprises a substantially cylindrical chamber 11 closed in the upper part by an annular washer 13 having an inlet port 12 connected to a ramp (not shown) of cooling fluid which is generally of oil.
  • Said cylindrical chamber 11 comprises an outlet opening 14 pierced substantially radially, said opening is connected to a jet duct 15 in the shape of a nozzle which directs the jet of fluid at the outlet towards the piston or, more exactly, towards the bottom of a vault of piston to cool said piston.
  • the chamber 11 is cylindrical for ease of understanding but it is understood that this chamber is of revolution about a longitudinal axis X.
  • the nozzle 10 comprises a platform 16 of revolution mounted coaxially in the cylindrical chamber 11.
  • the platform 16 is a circular plate 22 whose diameter is equal to or slightly smaller than the diameter of the chamber cylindrical to allow sliding of said platform along the longitudinal axis X of the chamber.
  • the platform 16 thus divides the cylindrical chamber 11 into two parts: a first upper reception part 17 for the cooling fluid and a second lower activation part 18 for the platform 16.
  • the second lower activation part is closed by a wall lower 19 in which is dug a calibrated leakage orifice 20.
  • the diameter of this leakage orifice is small of the order of a few millimeters.
  • the bottom wall 19 is substantially flat or flat and carries an elastic means 21 adapted to push the platform 16 in the opposite direction towards the first receiving portion of the cylindrical chamber 11.
  • Said resilient means housed in the second activation portion is preferentially a helical spring but it can be any other element having an elastic stiffness. Said resilient means is thus disposed between the bottom wall 19 and the platform 16.
  • the initial length of the elastic means is a function of the dimensions of the different elements constituting the nozzle but it is sufficient in one embodiment to allow closure of the opening of the outlet without presence of coolant.
  • the platform 16 comprises at least one guide pin 23 extending radially from the circular edge of the circular plate 22. Said at least one guide pin is preferably received in a longitudinal hollow groove (not shown) in the wall of the cylindrical chamber 11 and along the longitudinal axis X of said chamber. In this way, the platform is guided in its sliding to remain permanently substantially orthogonal to the sliding axis X and the chamber 11.
  • the platform 16 bears on a face turned towards the upper reception part 17 a spiral elastic element 24, a first end of which is fixed to said platform and the second end is secured to a shut-off valve 25.
  • Said elastic element is a list comprising a spiral bimetal.
  • a spiral bimetal is a bimetallic spiral bent.
  • the bimetallic strip comprises for example two metal strips contiguous with metallic materials having different expansion coefficients.
  • said element 24 is a spiral bimetallic having the characteristic of relaxing or winding as a function of the rise in temperature. Thus, as the temperature of the bimetal increases, one of the materials expands more than the other, which has the effect of bending the blades.
  • Said bimetallic strip is thus able to wind on itself or to take place according to the temperature of the bimetallic strip.
  • the spiral shape makes it possible to have a greater length of the blades making up the bimetallic strip, which allows greater elongation of the blades and thus greater displacement of one end of the bimetal with respect to the other.
  • said displacement of the ends of the bimetal is an angular displacement on a plane orthogonal to the axis of rotation which is the longitudinal axis X of the cylindrical chamber 11.
  • the bimetal is housed in the first upper part of receiving 17 of the cylindrical chamber 11 and is in contact with the cooling fluid.
  • the temperature of the bimetallic strip is therefore substantially equal to the temperature of said fluid.
  • the bimetallic strip spiral has the advantage of being able to generate a displacement in rotation of the second end about the longitudinal axis of the cylindrical chamber 11 important depending on the temperature while remaining in a small footprint.
  • the shut-off valve 25 comprises a cylindrical body 26 whose diameter is substantially equal to or slightly smaller than the diameter of the cylindrical chamber 11. Said body has a shape adjusted and complementary to the wall of the cylindrical chamber to easily seal the opening of output 14 of fluid.
  • the cylindrical body 26 is extended longitudinally towards the upper part or towards the inlet washer 13 and on an arc of a circular base of the cylindrical chamber, by a closing sheet 27 whose shape is substantially complementary to the wall of the cylindrical chamber.
  • the angle of the arc may for example be about ten degrees depending on the possible relaxation of the spiral elastic element 24.
  • Said sheet 27 preferably has a width greater than the diameter of the outlet opening 14 .
  • the cylindrical body 26 of the shutter valve comprises a radial orifice 28 whose diameter is equal to or greater than the diameter of the outlet opening 14 of the nozzle.
  • the shut-off valve is fixedly mounted fixed to the second end of the spiral bimetal whose opposite end is fixed to the platform 16, which is placed on an elastic means and can slide in a guided manner by means of a guide pin immersed in a longitudinal groove dug in the wall of the cylindrical chamber 11. Said platform is pushed to an initial position when the receiving portion does not contain coolant by the elastic means. All the elements are mounted such that the shutter 25 closes the outlet opening 14 in the initial position.
  • Cooling fluid enters said upper receiving portion 17 through the inlet port 12.
  • the cooling fluid is then contact with the spiral elastic element fixed to the shut-off valve. Cooling fluid can pass along the wall of the cylindrical chamber 11 between the circular edge of the circular plate 22 of the platform 16 and the wall of the chamber 11 to join the second lower activation portion 18. Pressure is then created between the upper receiving portion 17 and the lower activation portion 18, which has the effect of pushing the shutter shutter to the lower portion 18.
  • the leakage orifice dug in the bottom wall of the activation portion allows the escape of the cooling fluid for example to a fluid casing at the bottom of the engine.
  • the elastic means can then push the platform 16 to the initial position to plug the outlet opening 14.
  • the spiral elastic element will relax or wind on itself and rotate the shut-off valve 25 to bring the leaf 27 of the shutter valve to a position where the outlet opening 14 is disengaged, either to bring the radial orifice 28 facing the outlet opening 14, which allows the passage of the cooling fluid in the jet duct 15 to be then directed towards the piston to be cooled .
  • the different movements in longitudinal and rotation can be simply adjusted to allow the release of the outlet opening 14 according to a pressure threshold and a temperature threshold of the cooling fluid.
  • the invention is not limited to the embodiments of this plug, described above as examples, it encompasses all variants.
  • the guide finger and the groove in the wall of the cylindrical chamber can be replaced by a substantially oval base platform sliding in a chamber whose base is also substantially oval.
  • the nozzle may comprise a shut-off valve capable of sliding solely in rotation about the axis X of the cylindrical chamber as a function of the temperature of the cooling fluid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Temperature-Responsive Valves (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Gicleur de fluide (10) de refroidissement de piston d'un moteur à combustion interne comprenant : - une chambre cylindrique (11), - une ouverture de sortie (14) dudit fluide depuis la chambre cylindrique, caractérisé en ce que ledit gicleur comprend un clapet d'obturation (25) de l'ouverture apte à avoir un premier type de déplacement en fonction de la pression et un second type de déplacement en fonction de la température différent du premier type, pour autoriser le passage de fluide par l'ouverture de sortie à partir d'un seuil de pression et à partir d'un seuil de température.A piston cooling fluid nozzle (10) of an internal combustion engine comprising: a cylindrical chamber (11), an outlet opening (14) of said fluid from the cylindrical chamber, characterized in that said nozzle comprises a shutter valve (25) of the opening adapted to have a first type of displacement as a function of pressure and a second type of displacement as a function of the temperature different from the first type, to allow the passage of fluid through the outlet opening from a pressure threshold and from a temperature threshold.

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne les moteurs à combustion interne.The present invention relates to internal combustion engines.

La présente invention concerne notamment le refroidissement de piston de moteur à combustion interne.The present invention relates in particular to piston cooling of an internal combustion engine.

La présente invention concerne plus particulièrement un gicleur de refroidissement comprenant un clapet autorisant un jet de fluide de refroidissement à partir d'un seuil de température et à partir d'un seuil de pression.The present invention relates more particularly to a cooling nozzle comprising a valve allowing a jet of cooling fluid from a temperature threshold and from a pressure threshold.

Etat de la techniqueState of the art

Les moteurs à combustion interne comprennent de manière connue un carter-cylindres surmonté d'une culasse pour entourer des fûts cylindriques dans lesquels coulissent des pistons selon un mouvement de va-et-vient. Lesdits pistons délimitent avec la paroi du fût cylindrique et la culasse une chambre de combustion dans laquelle sont injectés de l'air composé d'air frais et éventuellement des gaz brulés et du carburant. Le volume de ladite chambre de combustion varie selon le mouvement du piston avec une réduction entrainant une compression des gaz contenus dans ladite chambre suivie d'une explosion/combustion pour repousser ledit piston vers le bas du carter-cylindres. Les pistons sont ainsi portés à très haute température et nécessitent un refroidissement par du fluide qui est généralement de l'huile. Des gicleurs de refroidissement de piston pour moteur à combustion interne sont utilisés pour projeter le fluide de refroidissement contre le fond de piston, c'est-à-dire contre la face d'une voute de piston extérieure à la chambre d'explosion.Internal combustion engines comprise in known manner a cylinder block surmounted by a cylinder head to surround cylindrical barrels in which pistons slide in a reciprocating motion. Said pistons delimit with the wall of the cylindrical shaft and the cylinder head a combustion chamber in which are injected air consisting of fresh air and possibly burnt gases and fuel. The volume of said combustion chamber varies according to the movement of the piston with a reduction causing a compression of the gases contained in said chamber followed by an explosion / combustion to push said piston down the crankcase. The pistons are thus brought to a very high temperature and require cooling by fluid which is generally oil. Piston cooling nozzles for an internal combustion engine are used to project the cooling fluid against the piston bottom, that is to say against the face of a piston vault external to the explosion chamber.

De manière générale, les gicleurs de refroidissement de piston sont des éléments fixés sur le carter moteur et comprenant d'une part un orifice d'amenée de fluide de refroidissement et d'autre part un orifice de sortie connecté avec un conduit de jet dirigé vers la voute de piston. La position du gicleur ainsi que la forme du conduit de jet doivent être déterminées avec précision, pour déterminer de façon précise l'impact du jet de fluide de refroidissement sur la voute de piston.In general, the piston cooling nozzles are elements fixed on the crankcase and comprising on the one hand a cooling fluid supply orifice and on the other hand an outlet orifice connected with a jet duct directed towards the engine crankcase. the piston vault. The position of the jet as well as the The shape of the jet duct must be accurately determined to accurately determine the impact of the coolant jet on the piston vault.

Le gicleur de piston autorise un jet de liquide de refroidissement en direction de la voute de piston sous des conditions de pression et de température dudit fluide. En effet d'une part, il faut un niveau de pression suffisant du fluide de refroidissement pour obtenir un jet efficace et d'autre part, le déclenchement du jet de refroidissement doit être effectué lorsque le moteur et le fluide de refroidissement est à une température nécessitant un refroidissement.The piston nozzle permits a jet of coolant towards the piston vault under pressure and temperature conditions of said fluid. On the one hand, it is necessary to have a sufficient pressure level of the cooling fluid to obtain an effective jet and on the other hand, the triggering of the cooling jet must be performed when the engine and the cooling fluid is at a temperature requiring cooling.

Plusieurs publications ont divulgué des modes de réalisation de gicleur de refroidissement de piston qui sont cependant complexes et difficiles à mettre en oeuvre.Several publications have disclosed piston cooling nozzle embodiments which are however complex and difficult to implement.

Par exemple, la publication FR2866386 divulgue un gicleur de refroidissement de piston comportant un élément cylindrique apte à coulisser dans une chambre cylindrique en fonction de la température et de la pression du fluide de refroidissement appuyant sur une membrane à mémoire de forme.For example, the publication FR2866386 discloses a piston cooling nozzle having a cylindrical member slidable in a cylindrical chamber depending on the temperature and the pressure of the cooling fluid pressing a shape memory membrane.

Ladite membrane présente des caractéristiques particulières pouvant entrainer des coûts importants dans la réalisation dudit gicleur. De plus, les seuils de températures et de pression sont des caractéristiques de la seule membrane, ce qui peut rendre difficile la mise au point.Said membrane has particular characteristics that can lead to significant costs in the production of said nozzle. In addition, the temperature and pressure thresholds are characteristics of the single membrane, which can make it difficult to focus.

Le but de l'invention est de remédier à ces problèmes et un des objets de l'invention est un gicleur de refroidissement de piston apte à autoriser un jet dudit fluide en direction d'une voute de piston de moteur thermique selon des seuils température et selon la pression dudit fluide, lesdits seuils de température et de pression pouvant être réglés de façon indépendante.The object of the invention is to remedy these problems and one of the objects of the invention is a piston cooling nozzle capable of allowing a jet of said fluid towards a heat engine piston vault according to temperature and temperature thresholds. according to the pressure of said fluid, said temperature and pressure thresholds being independently adjustable.

Bref résumé de l'inventionBrief summary of the invention

La présente invention concerne plus particulièrement un gicleur de fluide de refroidissement de piston d'un moteur à combustion interne comprenant :

  • une chambre cylindrique,
  • une ouverture de sortie dudit fluide depuis la chambre cylindrique,
caractérisé en ce que ledit gicleur comprend un clapet d'obturation de l'ouverture de sortie, mobile en rotation plane autour l'axe X de la chambre cylindrique sur un plan de rotation orthogonal audit axe X, pour autoriser le passage de fluide par l'ouverture de sortie à partir d'un seuil de la température du fluide.The present invention more particularly relates to a piston cooling fluid nozzle of an internal combustion engine comprising:
  • a cylindrical chamber,
  • an outlet opening of said fluid from the cylindrical chamber,
characterized in that said nozzle comprises a closure valve of the outlet opening, movable in plane rotation around the axis X of the chamber cylindrical on a plane of rotation orthogonal to said X axis, to allow the passage of fluid through the outlet opening from a threshold of the fluid temperature.

De manière avantageuse, le gicleur de fluide de refroidissement comprend un clapet d'obturation d'une ouverture de sortie dudit fluide, ledit clapet étant mobile en rotation plane sur un plan de rotation orthogonal à l'axe de la chambre cylindrique. La rotation peut ainsi être effectuée simplement pour dégager ou refermer l'ouverture de sortie selon le niveau de température du fluide refroidissement. De manière préférentielle l'ouverture de sortie est percée radialement par rapport à la chambre cylindrique de sorte et le clapet d'obturation présente une forme ajustée et complémentaire à la paroi de la chambre cylindrique pour obturer facilement ladite ouverture de sortie de fluide.Advantageously, the cooling fluid nozzle comprises a shutter valve of an outlet opening of said fluid, said valve being movable in plane rotation on a plane of rotation orthogonal to the axis of the cylindrical chamber. The rotation can thus be performed simply to release or close the outlet opening according to the temperature level of the cooling fluid. Preferably, the outlet opening is pierced radially with respect to the cylindrical chamber so that the shut-off valve has a shape that is adjusted and complementary to the wall of the cylindrical chamber to easily seal said fluid outlet opening.

Selon d'autres caractéristiques de l'invention :

  • le déplacement en rotation du clapet mobile est activé par un élément élastique.
According to other features of the invention:
  • the rotational movement of the movable valve is activated by an elastic element.

De manière avantageuse, le clapet mobile est activé par un élément élastique qui présente un encombrement réduit et qui par simple détente, est apte à mouvoir en rotation le volet d'obturation de l'ouverture de sortie.

  • l'élément élastique est un bilame spiralé.
Advantageously, the movable valve is activated by an elastic element which has a small footprint and which by simple expansion, is able to rotate the shutter flap of the outlet opening.
  • the elastic element is a spiral bimetal.

De manière avantageuse, le moyen élastique est dans une liste comprenant un bilame spiralé. Ledit bilame comporte des propriétés dépendant de la température et il est en contact avec le fluide de refroidissement. Ledit bilame peut donc de dérouler ou s'enrouler sur lui-même en fonction de la température du fluide qui traverse le logement du bilame. Le clapet d'obturation est alors apte à boucher l'ouverture de sortie en fonction de la température du fluide de refroidissement.

  • le clapet d'obturation de l'ouverture est mobile en coulissement selon l'axe X pour autoriser le passage de fluide par l'ouverture de sortie à partir d'un seuil de pression.
Advantageously, the elastic means is in a list comprising a spiral bimetal. The bimetal has temperature dependent properties and is in contact with the cooling fluid. Said bimetallic strip can therefore unwind or wrap around itself depending on the temperature of the fluid passing through the bimetallic housing. The shut-off valve is then able to plug the outlet opening according to the temperature of the cooling fluid.
  • the shutter valve of the opening is movable in sliding along the X axis to allow the passage of fluid through the outlet opening from a pressure threshold.

De manière avantageuse, le clapet d'obturation est mobile en coulissement selon l'axe longitudinal X de la chambre cylindrique, ce qui est simple à réaliser. Ledit coulissement selon l'axe X est fonction de la pression du fluide de refroidissement qui entre dans le gicleur et peut appuyer sur le clapet de refroidissement.

  • le déplacement en rotation plane sur le plan de rotation et le coulissement selon l'axe X sont indépendants l'un de l'autre.
Advantageously, the shutter valve is slidably movable along the longitudinal axis X of the cylindrical chamber, which is simple to perform. Said sliding along the axis X is a function of the pressure of the coolant that enters the nozzle and can press the cooling flap.
  • the displacement in plane rotation on the plane of rotation and the sliding along the X axis are independent of one another.

De manière avantageuse, le premier déplacement en rotation plane sur le plan de rotation est indépendant du second déplacement de coulissement selon l'axe X, ce qui permet un réglage et une mise au point simples du fonctionnement du gicleur.

  • le gicleur comprend une plateforme apte à coulisser selon l'axe de la chambre cylindrique et séparant la chambre en une première partie de réception de fluide et une seconde partie d'activation.
Advantageously, the first plane rotation displacement on the plane of rotation is independent of the second X-axis sliding movement, which allows simple adjustment and focusing of the nozzle operation.
  • the nozzle comprises a platform capable of sliding along the axis of the cylindrical chamber and separating the chamber into a first fluid-receiving portion and a second activation portion.

De manière avantageuse, le gicleur comprend une plateforme sensiblement circulaire apte à coulisser selon l'axe de la chambre cylindrique et séparant ladite chambre cylindrique du gicleur en une première partie de réception de fluide et une seconde parte d'activation. La plateforme présente de manière préférentielle la forme d'un disque monté sensiblement coaxial avec la chambre cylindrique et présentant un diamètre égal ou légèrement inférieur au diamètre de la chambre cylindre pour permettre un coulissement dudit disque mais également une étanchéité entre la première partie de réception et la seconde partie d'activation. L'étanchéité n'est cependant pas parfaite et du fluide de refroidissement en quantité minime doit pouvoir passer entre la paroi du disque et la paroi de la chambre cylindrique pour réduire des efforts s'opposant au coulissement dudit disque selon l'axe longitudinal X de la chambre cylindrique.

  • la seconde partie d'activation contient un moyen élastique apte à repousser la plateforme vers la première partie de réception.
Advantageously, the nozzle comprises a substantially circular platform slidable along the axis of the cylindrical chamber and separating said cylindrical chamber of the nozzle in a first fluid receiving portion and a second activation portion. The platform preferably has the shape of a disk mounted substantially coaxial with the cylindrical chamber and having a diameter equal to or slightly smaller than the diameter of the cylinder chamber to allow sliding of said disk but also a seal between the first receiving portion and the second activation part. However, the seal is not perfect and the cooling fluid in a small quantity must be able to pass between the wall of the disc and the wall of the cylindrical chamber to reduce forces opposing the sliding of said disc along the longitudinal axis X of the cylindrical chamber.
  • the second activation part contains an elastic means able to push the platform towards the first receiving part.

De manière avantageuse, la seconde chambre loge un moyen élastique, de manière préférentielle un ressort hélicoïdal, apte à repousser la plateforme vers la première chambre. La longueur initiale au repos et la raideur dudit moyen élastique permettent une mise au point simple du coulissement de la plateforme. Le fluide de refroidissement remplit la première partie de réception et appuie sur la plateforme et donc sur le moyen élastique pour permettre un coulissement de ladite plateforme entrainant la formation d'un passage par l'ouverture de sortie. Le gicleur peut alors permettre un passage de fluide de refroidissement par l'ouverture de sortie selon la pression dudit fluide. Lorsque la pression du fluide de refroidissement baisse et devient insuffisante, par exemple avec l'arrêt du pompage dudit fluide, le moyen élastique peut repousser la plateforme vers la première partie de réception de la chambre cylindrique et ainsi permettre l'obturation de l'ouverture de sortie.

  • le gicleur comporte un orifice de fuite calibré creusé dans une paroi inférieure de la seconde chambre.
Advantageously, the second chamber houses an elastic means, preferably a helical spring, able to push the platform towards the first chamber. The initial length at rest and the stiffness of said elastic means allow a simple development of the sliding platform. The cooling fluid fills the first receiving part and presses on the platform and thus on the elastic means to allow a sliding of said platform causing the formation of a passage through the outlet opening. The nozzle may then allow a passage of cooling fluid through the outlet opening according to the pressure of said fluid. When the pressure of the cooling fluid decreases and becomes insufficient, for example with the cessation of the pumping of said fluid, the elastic means can push the platform towards the first receiving part of the cylindrical chamber and thus allow the shutter to be closed Release.
  • the nozzle comprises a calibrated leak orifice dug in a lower wall of the second chamber.

De manière avantageuse, le gicleur comporte un orifice de fuite calibré creusé dans une paroi inférieure de la seconde partie d'activation. Ledit orifice de fuite calibré permet une différence de pression entre la première partie de réception et la seconde partie d'activation pour permettre un fonctionnement sensiblement constant du gicleur pour le passage de fluide de refroidissement au travers de l'ouverture de sortie. Le diamètre de l'orifice de fuite est calibré afin de permettre un écoulement de fuite faible du fluide du clapet.

  • la plateforme porte le clapet d'obturation de l'ouverture de sortie mobile en rotation autour de l'axe de la chambre cylindrique.
Advantageously, the nozzle comprises a calibrated leak orifice dug in a bottom wall of the second activation portion. The calibrated leakage port allows a pressure difference between the first receiving portion and the second activating portion to permit substantially constant nozzle operation for the passage of cooling fluid through the exit aperture. The diameter of the leakage orifice is calibrated to allow low leakage flow of the valve fluid.
  • the platform carries the shutter valve of the movable outlet opening in rotation about the axis of the cylindrical chamber.

De manière avantageuse, la plateforme porte le clapet d'obturation de l'ouverture de sortie mobile en rotation autour de l'axe longitudinal de la chambre cylindrique. De cette manière, le réglage du fonctionnement du clapet selon la pression est un étalonnage du moyen élastique repoussant la plateforme vers la première partie de réception de la chambre cylindrique. De manière préférentielle, on ménage un écoulement permanent du fluide de refroidissement en quantité minime pour assurer le fonctionnement du clapet d'une part selon la température du fluide en contact avec l'élément élastique réagissant à la température et d'autre part selon la pression dudit fluide en évitant des efforts trop importants s'opposant au coulissement de la plateforme.Advantageously, the platform carries the shutter valve of the movable outlet opening in rotation around the longitudinal axis of the cylindrical chamber. In this way, the adjustment of the operation of the valve according to the pressure is a calibration of the elastic means pushing the platform towards the first receiving part of the cylindrical chamber. Preferably, a permanent flow of the cooling fluid is maintained in a minimal amount to ensure the operation of the valve on the one hand according to the temperature of the fluid in contact with the elastic element reacting to the temperature and on the other hand according to the pressure said fluid avoiding excessive forces opposing the sliding of the platform.

De manière avantageuse, le gicleur comprend le clapet d'obturation qui est apte à effectuer un premier type de déplacement en fonction de la température dudit fluide et un second type de déplacement en fonction de la pression du fluide de refroidissement, le deuxième type étant différent du premier type, pour autoriser le passage de fluide par ladite ouverture de sortie à partir d'un premier seuil de température et à partir d'un second seuil de pression, ce qui simplifie la mise au point dudit gicleur. En effet, le fonctionnement du gicleur est indépendant des caractéristiques d'un seul élément d'activation du clapet.Advantageously, the nozzle comprises the shut-off valve which is capable of performing a first type of displacement as a function of the temperature of said fluid and a second type of displacement as a function of the pressure of the cooling fluid, the second type being different. of the first type, to allow the passage of fluid through said outlet opening from a first temperature threshold and from a second pressure threshold, which simplifies the development of said nozzle. Indeed, the operation of the nozzle is independent of the characteristics of a single activation element of the valve.

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 représente une vue schématique de coupe transversale du gicleur selon l'invention en une première position fermée,
  • la figure 2 représente une vue schématique de coupe transversale du gicleur selon l'invention en une deuxième position ouverte par la pression,
  • la figure 3 représente une vue schématique de volet d'obturation,
  • la figure 4 représente une vue schématique de volet d'obturation.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which
  • the figure 1 represents a schematic cross-sectional view of the nozzle according to the invention in a first closed position,
  • the figure 2 represents a schematic cross-sectional view of the nozzle according to the invention in a second open position by pressure,
  • the figure 3 represents a schematic view of shutter shutter,
  • the figure 4 represents a schematic view of shutter shutter.

Description détaillée des figuresDetailed description of the figures

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

De manière connue, les moteurs thermiques de véhicules automobiles comprennent une culasse montée sur un carter-cylindres pour entourer des fûts cylindriques dans lesquels coulissent dans un mouvement de va-et-vient des pistons. Le piston délimite avec la paroi du fût cylindrique dans le carter-cylindre et la culasse une chambre à combustion dans laquelle sont injectés de l'air avec éventuellement des gaz brulés recyclés et du carburant. Le volume de ladite chambre est ensuite réduit par le coulissement du piston vers la culasse entrainant la compression des gaz avant une phase d'explosion ou de combustion desdits gaz qui a pour effet de repousser ledit piston vers le bas du moteur en direction opposée à la culasse. Ladite combustion entraine une élévation de la température au moins des éléments entourant ladite chambre de combustion dont le piston. Pour pallier un problème de hautes températures du piston, des éléments de refroidissement sont disposés dans le moteur et un de ces éléments est un gicleur de piston.In a known manner, the engines of motor vehicles include a cylinder head mounted on a crankcase to surround cylindrical barrels in which slide in a movement back and forth pistons. The piston delimits with the wall of the cylindrical shaft in the crankcase and the cylinder head a combustion chamber in which air is injected with possibly recycled burnt gases and fuel. The volume of said chamber is then reduced by the sliding of the piston towards the cylinder head causing the compression of the gases before an explosion phase or combustion of said gas which has the effect of pushing said piston down the engine in the direction opposite to the cylinder head. Said combustion results in an increase in the temperature of at least the elements surrounding said combustion chamber including the piston. To overcome a problem of high temperatures of the piston, cooling elements are arranged in the engine and one of these elements is a piston nozzle.

Selon les figures 1 et 2 représentant de manière schématique un gicleur de piston 10, ledit gicleur comprend une chambre sensiblement cylindrique 11 fermée en partie supérieure par une rondelle annulaire 13 comportant un orifice d'entrée 12 connecté à une rampe (non représentée) de fluide de refroidissement qui est généralement de l'huile. Ladite chambre cylindrique 11 comprend une ouverture de sortie 14 percée sensiblement radialement, ladite ouverture est connectée à un conduit de jet 15 en forme de bec qui dirige le jet de fluide en sortie vers le piston ou plus exactement vers le fond d'une voute de piston afin de refroidir ledit piston. Dans la suite de la description, la chambre 11 est cylindrique pour faciliter la compréhension mais il est entendu que cette chambre est de révolution autour d'un axe longitudinal X.According to Figures 1 and 2 schematically representing a piston nozzle 10, said nozzle comprises a substantially cylindrical chamber 11 closed in the upper part by an annular washer 13 having an inlet port 12 connected to a ramp (not shown) of cooling fluid which is generally of oil. Said cylindrical chamber 11 comprises an outlet opening 14 pierced substantially radially, said opening is connected to a jet duct 15 in the shape of a nozzle which directs the jet of fluid at the outlet towards the piston or, more exactly, towards the bottom of a vault of piston to cool said piston. In the following description, the chamber 11 is cylindrical for ease of understanding but it is understood that this chamber is of revolution about a longitudinal axis X.

Selon un mode de réalisation de l'invention, le gicleur 10 comprend une plateforme 16 de révolution montée de façon coaxiale dans la chambre cylindrique 11. La plateforme 16 est une plaque circulaire 22 dont le diamètre est égal voire légèrement inférieur au diamètre de la chambre cylindrique pour permettre un coulissement de ladite plateforme selon l'axe longitudinal X de la chambre. La plateforme 16 partage ainsi en deux parties la chambre cylindrique 11 : une première partie supérieure de réception 17 du fluide de refroidissement et une seconde partie inférieure d'activation 18 de la plateforme 16. La seconde partie inférieure d'activation est fermée par une paroi inférieure 19 dans laquelle est creusé un orifice de fuite calibré 20. Le diamètre de cet orifice de fuite est petit de l'ordre de quelques millimètres.According to one embodiment of the invention, the nozzle 10 comprises a platform 16 of revolution mounted coaxially in the cylindrical chamber 11. The platform 16 is a circular plate 22 whose diameter is equal to or slightly smaller than the diameter of the chamber cylindrical to allow sliding of said platform along the longitudinal axis X of the chamber. The platform 16 thus divides the cylindrical chamber 11 into two parts: a first upper reception part 17 for the cooling fluid and a second lower activation part 18 for the platform 16. The second lower activation part is closed by a wall lower 19 in which is dug a calibrated leakage orifice 20. The diameter of this leakage orifice is small of the order of a few millimeters.

La paroi inférieure 19 est sensiblement plate ou plane et porte un moyen élastique 21 apte à repousser la plateforme 16 en direction opposée vers la première partie de réception de la chambre cylindrique 11. Ledit moyen élastique logé dans la seconde partie d'activation, est de manière préférentielle un ressort hélicoïdal mais il peut être n'importe quel autre élément présentant une raideur élastique. Ledit moyen élastique est ainsi disposé entre la paroi inférieure 19 et la plateforme 16. La longueur initiale du moyen élastique est fonction des dimensions des différents éléments constituant le gicleur mais elle est suffisante dans un mode de réalisation pour permettre une obturation de l'ouverture de sortie sans présence de fluide de refroidissement.The bottom wall 19 is substantially flat or flat and carries an elastic means 21 adapted to push the platform 16 in the opposite direction towards the first receiving portion of the cylindrical chamber 11. Said resilient means housed in the second activation portion, is preferentially a helical spring but it can be any other element having an elastic stiffness. Said resilient means is thus disposed between the bottom wall 19 and the platform 16. The initial length of the elastic means is a function of the dimensions of the different elements constituting the nozzle but it is sufficient in one embodiment to allow closure of the opening of the outlet without presence of coolant.

La plateforme 16 comprend au moins un doigt de guidage 23 s'étendant radialement depuis la bordure circulaire de la plaque circulaire 22. Ledit au-moins un doigt de guidage est reçu de manière préférentielle dans une rainure longitudinale creusée (non représentée) dans la paroi de la chambre cylindrique 11 et selon l'axe longitudinal X de ladite chambre. De cette façon, la plateforme est guidée dans son coulissement pour rester de façon permanente sensiblement orthogonale à l'axe X de coulissement et de la chambre 11.The platform 16 comprises at least one guide pin 23 extending radially from the circular edge of the circular plate 22. Said at least one guide pin is preferably received in a longitudinal hollow groove (not shown) in the wall of the cylindrical chamber 11 and along the longitudinal axis X of said chamber. In this way, the platform is guided in its sliding to remain permanently substantially orthogonal to the sliding axis X and the chamber 11.

La plateforme 16 porte sur une face tournée vers la partie supérieure de réception 17 un élément élastique spiralé 24 dont une première extrémité est fixée à ladite plateforme et la seconde extrémité est fixée solidaire d'un clapet d'obturation 25. Ledit élément élastique est dans une liste comportant un bilame spiralé. Un bilame spiralé est un bilame enroulé en spirale. Le bilame comprend par exemple deux lames métalliques accolées de matériaux métalliques présentant des coefficients de dilatation différents. Dans le mode de réalisation préféré, ledit élément 24 est un bilame spiralé qui présente la caractéristique de se détendre ou de s'enrouler en fonction de la montée en température. Ainsi lorsque la température du bilame augmente, l'un des matériaux se dilate plus que l'autre, ce qui a pour effet de courber les lames. Ledit bilame est donc apte à s'enrouler sur lui-même ou à se dérouler en fonction de la température du bilame. La forme en spirale permet d'avoir une plus grande longueur des lames composant le bilame, ce qui permet allongement plus important des lames et donc un déplacement plus important d'une extrémité du bilame par rapport à l'autre. Selon le mode de réalisation présenté, ledit déplacement des extrémités du bilame est un déplacement angulaire sur un plan orthogonal à l'axe de rotation qui est l'axe longitudinal X de la chambre cylindrique 11. Le bilame est logé dans la première partie supérieure de réception 17 de la chambre cylindrique 11 et il est en contact avec le fluide de refroidissement. La température du bilame est donc sensiblement égale à la température dudit fluide. Lorsque ledit bilame se détend ou s'enroule par exemple lorsqu'il est chauffé, la seconde extrémité coulisse le long de la paroi de la chambre cylindrique 11 entrainant un mouvement de rotation du clapet d'obturation 25 auquel ladite seconde extrémité est fixée, autour de l'axe longitudinal X de la chambre cylindrique 11. Le bilame spiralé présente l'avantage de pouvoir générer un déplacement en rotation de la seconde extrémité autour de l'axe longitudinal de la chambre cylindrique 11 important en fonction de la température tout en restant dans un encombrement réduit.The platform 16 bears on a face turned towards the upper reception part 17 a spiral elastic element 24, a first end of which is fixed to said platform and the second end is secured to a shut-off valve 25. Said elastic element is a list comprising a spiral bimetal. A spiral bimetal is a bimetallic spiral bent. The bimetallic strip comprises for example two metal strips contiguous with metallic materials having different expansion coefficients. In the preferred embodiment, said element 24 is a spiral bimetallic having the characteristic of relaxing or winding as a function of the rise in temperature. Thus, as the temperature of the bimetal increases, one of the materials expands more than the other, which has the effect of bending the blades. Said bimetallic strip is thus able to wind on itself or to take place according to the temperature of the bimetallic strip. The spiral shape makes it possible to have a greater length of the blades making up the bimetallic strip, which allows greater elongation of the blades and thus greater displacement of one end of the bimetal with respect to the other. According to the embodiment presented, said displacement of the ends of the bimetal is an angular displacement on a plane orthogonal to the axis of rotation which is the longitudinal axis X of the cylindrical chamber 11. The bimetal is housed in the first upper part of receiving 17 of the cylindrical chamber 11 and is in contact with the cooling fluid. The temperature of the bimetallic strip is therefore substantially equal to the temperature of said fluid. When said bimetal bends or coils for example when it is heated, the second end slides along the wall of the cylindrical chamber 11 causing a rotational movement of the shutter valve 25 to which said second end is fixed, around of the longitudinal axis X of the cylindrical chamber 11. The bimetallic strip spiral has the advantage of being able to generate a displacement in rotation of the second end about the longitudinal axis of the cylindrical chamber 11 important depending on the temperature while remaining in a small footprint.

Le clapet d'obturation 25 comporte un corps cylindrique 26 dont le diamètre est sensiblement égal ou légèrement inférieur au diamètre de la chambre cylindrique 11. Ledit corps présente une forme ajustée et complémentaire à la paroi de la chambre cylindrique pour obturer facilement l'ouverture de sortie 14 de fluide.The shut-off valve 25 comprises a cylindrical body 26 whose diameter is substantially equal to or slightly smaller than the diameter of the cylindrical chamber 11. Said body has a shape adjusted and complementary to the wall of the cylindrical chamber to easily seal the opening of output 14 of fluid.

Selon un mode de réalisation représenté en figure 3, le corps cylindrique 26 est prolongé longitudinalement vers la partie supérieure ou vers la rondelle d'entrée 13 et sur un arc d'une base circulaire de la chambre cylindrique, par une feuille de fermeture 27 dont la forme est sensiblement complémentaire à la paroi de la chambre cylindrique. L'angle de l'arc peut être par exemple d'une dizaine de degrés en fonction de la détente possible de l'élément élastique spiralé 24. Ladite feuille 27 présente de manière préférentielle une largeur supérieure au diamètre de l'ouverture de sortie 14.According to an embodiment represented in figure 3 the cylindrical body 26 is extended longitudinally towards the upper part or towards the inlet washer 13 and on an arc of a circular base of the cylindrical chamber, by a closing sheet 27 whose shape is substantially complementary to the wall of the cylindrical chamber. The angle of the arc may for example be about ten degrees depending on the possible relaxation of the spiral elastic element 24. Said sheet 27 preferably has a width greater than the diameter of the outlet opening 14 .

Selon un autre mode de réalisation représenté en figure 4, le corps cylindrique 26 du clapet d'obturation comporte un orifice radial 28 dont le diamètre est égal voire supérieur au diamètre de l'ouverture de sortie 14 du gicleur.According to another embodiment shown in figure 4 , the cylindrical body 26 of the shutter valve comprises a radial orifice 28 whose diameter is equal to or greater than the diameter of the outlet opening 14 of the nozzle.

Le clapet d'obturation est monté fixé solidaire de la seconde extrémité du bilame spiralé dont la première extrémité opposée est fixée à la plateforme 16, laquelle est posée sur un moyen élastique et peut coulisser de manière guidée grâce à un doigt de guidage plongé dans une rainure longitudinale creusé dans la paroi de la chambre cylindrique 11. Ladite plateforme est repoussée vers une position initiale lorsque la partie de réception ne contient pas de fluide de refroidissement par le moyen élastique. Tous les éléments sont montés de telle façon que le volet d'obturation 25 bouche l'ouverture de sortie 14 en position initiale.The shut-off valve is fixedly mounted fixed to the second end of the spiral bimetal whose opposite end is fixed to the platform 16, which is placed on an elastic means and can slide in a guided manner by means of a guide pin immersed in a longitudinal groove dug in the wall of the cylindrical chamber 11. Said platform is pushed to an initial position when the receiving portion does not contain coolant by the elastic means. All the elements are mounted such that the shutter 25 closes the outlet opening 14 in the initial position.

Du fluide de refroidissement pénètre dans ladite partie supérieure de réception 17 par l'orifice d'entrée 12. Le fluide de refroidissement est alors en contact avec l'élément élastique spiralé fixé au clapet d'obturation. Du fluide de refroidissement peut passer le long de la paroi de la chambre cylindrique 11 entre la bordure circulaire de la plaque circulaire 22 de la plateforme 16 et la paroi de la chambre 11 pour rejoindre la seconde partie inférieure d'activation 18. Une différence de pression se créé alors entre la partie supérieure de réception 17 et la partie inférieure d'activation 18, ce qui a pour effet de pousser le volet d'obturation vers la partie inférieure 18. En cas de baisse de pression de fluide refroidissement, l'orifice de fuite creusé dans la paroi inférieure de la partie d'activation permet l'échappement du fluide de refroidissement par exemple vers un carter de fluide en bas du moteur. Le moyen élastique peut alors repousser la plateforme 16 vers la position initiale pour boucher l'ouverture de sortie 14.Cooling fluid enters said upper receiving portion 17 through the inlet port 12. The cooling fluid is then contact with the spiral elastic element fixed to the shut-off valve. Cooling fluid can pass along the wall of the cylindrical chamber 11 between the circular edge of the circular plate 22 of the platform 16 and the wall of the chamber 11 to join the second lower activation portion 18. pressure is then created between the upper receiving portion 17 and the lower activation portion 18, which has the effect of pushing the shutter shutter to the lower portion 18. In case of drop of coolant pressure, the leakage orifice dug in the bottom wall of the activation portion allows the escape of the cooling fluid for example to a fluid casing at the bottom of the engine. The elastic means can then push the platform 16 to the initial position to plug the outlet opening 14.

En fonction de la température du fluide de refroidissement, l'élément élastique spiralé va se détendre ou s'enrouler sur lui-même et faire pivoter le clapet d'obturation 25 pour amener soit la feuille 27 du clapet d'obturation dans une position où l'ouverture de sortie 14 est dégagée, soit pour amener l'orifice radial 28 en regard avec l'ouverture de sortie 14, ce qui autorise le passage du fluide refroidissement dans le conduit de jet 15 pour être dirigé ensuite vers le piston à refroidir.Depending on the temperature of the cooling fluid, the spiral elastic element will relax or wind on itself and rotate the shut-off valve 25 to bring the leaf 27 of the shutter valve to a position where the outlet opening 14 is disengaged, either to bring the radial orifice 28 facing the outlet opening 14, which allows the passage of the cooling fluid in the jet duct 15 to be then directed towards the piston to be cooled .

Les différents déplacements en longitudinal et en rotation peuvent être simplement réglés pour autoriser le dégagement de l'ouverture de sortie 14 selon un seuil de pression et un seuil de température du fluide de refroidissement.The different movements in longitudinal and rotation can be simply adjusted to allow the release of the outlet opening 14 according to a pressure threshold and a temperature threshold of the cooling fluid.

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. Le doigt de guidage ainsi que la rainure dans la paroi de la chambre cylindrique peuvent remplacés par une plateforme de base sensiblement ovale coulissant dans une chambre dont la base est également sensiblement ovale.As goes without saying, the invention is not limited to the embodiments of this plug, described above as examples, it encompasses all variants. The guide finger and the groove in the wall of the cylindrical chamber can be replaced by a substantially oval base platform sliding in a chamber whose base is also substantially oval.

Le gicleur peut comprendre un clapet d'obturation apte à coulisser uniquement en rotation autour l'axe X de la chambre cylindrique en fonction de la température du fluide de refroidissement.The nozzle may comprise a shut-off valve capable of sliding solely in rotation about the axis X of the cylindrical chamber as a function of the temperature of the cooling fluid.

Claims (10)

Gicleur de fluide (10) de refroidissement de piston d'un moteur à combustion interne comprenant : - une chambre cylindrique (11), - une ouverture de sortie (14) dudit fluide depuis la chambre cylindrique, caractérisé en ce que ledit gicleur comprend un clapet d'obturation (25) de l'ouverture cylindrique (14), mobile en rotation plane autour l'axe X de la chambre cylindrique (11) sur un plan de rotation orthogonal audit axe X, pour autoriser le passage de fluide par l'ouverture de sortie à partir d'un seuil de la température du fluide.A piston cooling fluid nozzle (10) of an internal combustion engine comprising: a cylindrical chamber (11), an outlet opening (14) of said fluid from the cylindrical chamber, characterized in that said nozzle comprises a shutter valve (25) of the cylindrical opening (14), movable in plane rotation about the axis X of the cylindrical chamber (11) on a plane of rotation orthogonal to said axis X, to allow the passage of fluid through the outlet opening from a threshold of the fluid temperature. Gicleur (10) selon la revendication 1, caractérisé en ce que le déplacement en rotation du clapet mobile est activé par un moyen élastique (24).Nozzle (10) according to claim 1, characterized in that the rotational displacement of the movable valve is activated by an elastic means (24). Gicleur selon la revendication 1 ou 2, caractérisé en ce que le moyen élastique (24) est un bilame spiralé.Nozzle according to claim 1 or 2, characterized in that the elastic means (24) is a spiral bimetallic. Gicleur selon la revendication 1 à 3, caractérisé en ce que le clapet d'obturation (25) de l'ouverture est mobile en coulissement selon l'axe X pour autoriser le passage de fluide par l'ouverture de sortie à partir d'un seuil de pression.Nozzle according to claim 1 to 3, characterized in that the closure valve (25) of the opening is slidable along the axis X to allow the passage of fluid through the outlet opening from a pressure threshold. Gicleur selon la revendication 4, caractérisé en ce que le coulissement en rotation plane sur le plan de rotation et le coulissement selon l'axe X sont indépendants l'un de l'autre.Nozzle according to claim 4, characterized in that the sliding in plane rotation on the plane of rotation and the sliding along the X axis are independent of one another. Gicleur selon la revendication 4 ou 5, caractérisé en ce que le coulissement selon l'axe X est fonction de la pression du fluide de refroidissement.Nozzle according to claim 4 or 5, characterized in that the sliding along the axis X is a function of the pressure of the cooling fluid. Gicleur (10) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le gicleur comprend une plateforme (16) apte à coulisser selon l'axe X de la chambre cylindrique (11) et séparant ladite chambre en une première partie de réception de fluide (17) et une seconde partie d'activation (18).Nozzle (10) according to any one of claims 1 to 6, characterized in that the nozzle comprises a platform (16) adapted to slide along the axis X of the cylindrical chamber (11) and separating said chamber in a first part receiving fluid (17) and a second activating portion (18). Gicleur (10) selon la revendication 7, caractérisé en ce que la seconde partie d'activation (18) contient un moyen élastique (21) apte à repousser la plateforme vers la première partie de réception (17).Nozzle (10) according to claim 7, characterized in that the second activation portion (18) contains an elastic means (21) adapted to push the platform towards the first receiving portion (17). Gicleur (10) selon l'une quelconque des revendications 7 ou 8, caractérisé en ce que le gicleur comporte un orifice de fuite calibré (20) creusé dans une paroi inférieure de la seconde partie d'activation (18).Nozzle (10) according to any one of claims 7 or 8, characterized in that the nozzle comprises a calibrated leak orifice (20) hollowed in a bottom wall of the second activation portion (18). Gicleur (10) selon l'une quelconque des revendications 7 à 9, caractérisé en ce que la plateforme (16) porte le clapet d'obturation (25) de l'ouverture de sortie mobile en rotation plane autour de l'axe X de la chambre cylindrique (11).Nozzle (10) according to any one of claims 7 to 9, characterized in that the platform (16) carries the shutter valve (25) of the movable outlet opening in plane rotation about the axis X of the cylindrical chamber (11).
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WO2006037515A1 (en) * 2004-09-30 2006-04-13 Daimlerchrysler Ag Device for regulating piston cooling of a reciprocating internal combustion engine
DE102007039109A1 (en) * 2007-08-18 2009-02-19 Bayerische Motoren Werke Aktiengesellschaft Temperature-dependent selectable pressure regulating valve, particularly for use in coolant channel of piston cooling system of internal combustion engine, has temperature-dependent selectable locking element cooperating with locking body
EP2816206A1 (en) * 2013-06-20 2014-12-24 Renault S.A.S. Spray nozzle for ejecting a cooling fluid towards a piston

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5819692A (en) * 1997-05-01 1998-10-13 Schafer; Timothy Vernon Piston cooling oil control valve
EP1076164A1 (en) * 1999-08-12 2001-02-14 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Device and method of regulation of oil pressure in a combustion engine
FR2866386A1 (en) 2004-02-13 2005-08-19 Lc Maitre Ind Valve for jet nozzle, has elastically deformable portion pushing rounded portion, forming valve piece, against annular valve seat to seal passage between channel whose end constitutes seat and distribution channel
WO2006037515A1 (en) * 2004-09-30 2006-04-13 Daimlerchrysler Ag Device for regulating piston cooling of a reciprocating internal combustion engine
DE102007039109A1 (en) * 2007-08-18 2009-02-19 Bayerische Motoren Werke Aktiengesellschaft Temperature-dependent selectable pressure regulating valve, particularly for use in coolant channel of piston cooling system of internal combustion engine, has temperature-dependent selectable locking element cooperating with locking body
EP2816206A1 (en) * 2013-06-20 2014-12-24 Renault S.A.S. Spray nozzle for ejecting a cooling fluid towards a piston

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019101469A1 (en) * 2019-01-22 2020-07-23 Bayerische Motoren Werke Aktiengesellschaft Reciprocating piston internal combustion engine with piston cooling
CN114592963A (en) * 2022-03-17 2022-06-07 潍柴动力股份有限公司 Piston cooling system monitoring method and device and engine

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FR3048452B1 (en) 2020-04-10
FR3048452A1 (en) 2017-09-08
EP3216993B1 (en) 2019-08-28

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