EP1529935B1 - Jet for piston cooling with reduced inter-axle - Google Patents

Jet for piston cooling with reduced inter-axle Download PDF

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Publication number
EP1529935B1
EP1529935B1 EP04356176A EP04356176A EP1529935B1 EP 1529935 B1 EP1529935 B1 EP 1529935B1 EP 04356176 A EP04356176 A EP 04356176A EP 04356176 A EP04356176 A EP 04356176A EP 1529935 B1 EP1529935 B1 EP 1529935B1
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EP
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Prior art keywords
nozzle body
nozzle
peripheral wall
axis
transverse
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EP04356176A
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German (de)
French (fr)
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EP1529935A1 (en
Inventor
Yves Bontaz
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Bontaz Centre SA
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Bontaz Centre SA
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00Liquid cooling
    • F01P3/06Arrangements for cooling pistons
    • F01P3/08Cooling of piston exterior only, e.g. by jets

Definitions

  • the present invention relates to the piston cooling nozzles for an internal combustion engine, used to project a cooling fluid such as oil against the piston bottom, that is to say against the piston face external to the piston. explosion chamber.
  • the piston cooling nozzles usually used are inserts attached to the crankcase and communicating with a coolant supply port.
  • the position of the nozzle must be accurately determined to accurately determine the impact of the coolant jet on the piston bottom.
  • Piston cooling nozzles for an internal combustion engine comprising a generally cylindrical peripheral wall nozzle body surrounding an axial bore containing a valve means.
  • the peripheral wall is traversed by a transverse bore communicating with the axial bore and connected to a tube of cooling fluid outlet conduit.
  • the nozzle body has a cylindrical portion shaped for its introduction into a fluid supply port of the engine cylinder housing.
  • a first solution consists in providing a nozzle having a coaxial screw-valve which is screwed into a threaded end portion of the fluid supply pipe. An attached transverse plate blocks the nozzle in rotation.
  • a second solution usually used for fixing the nozzle on the engine cylinder housing consists in providing a transverse fixing plate, having a first hole in which is fixed the nozzle body, and having a second hole offset laterally opposite the transverse bore, for the passage of a screw fixing the nozzle on the engine cylinder housing.
  • This second solution is simpler to implement, but it has the disadvantage of a sometimes excessive congestion.
  • the peripheral wall of the nozzle body must be sufficiently thick for the axial bore to effectively retain the coolant outlet conduit.
  • the mounting screw must be of sufficient diameter to ensure sufficient clamping of the mounting plate on the engine cylinder housing, avoiding any risk of detachment or vibration.
  • the problem proposed by the present invention is thus to design a new piston cooling nozzle structure, the fixing of which is carried out by a transverse fixing plate, the size of the transverse fixing plate is reduced, and whose between the axis of the fixing screw and the axis of the nozzle body is also reduced.
  • the aim is to make it possible to adapt such nozzles in engines having a reduced space for fixing the cooling nozzle.
  • the object of the invention is, simultaneously, to ensure correct operation and reliability of the piston cooling nozzle, and in particular a correct retention of the cooling fluid outlet duct and of the entire nozzle itself.
  • the external recess in the diametrically opposite portion of the peripheral wall makes it possible to bring the axis of the nozzle body closer to the axis of the fixing screw, while allowing the operation of the fastening screw by a clamping tool such as than a robot arm end.
  • Another advantage is that the outer recess provides relief of the piston cooling nozzle, which is favorable in the current search for engine performance.
  • the inter-axis of the first and second holes of the transverse fixing plate is just sufficient to allow the engagement and rotation of a screwing tool on the fixing screw head without contact with the peripheral wall of the jet body.
  • the external recess is a flat parallel to the axis of the nozzle body.
  • the external recess is a concave cylindrical surface with an axis parallel to the axis of the nozzle body and coaxial with the axis of the fixing screw.
  • This latter embodiment is particularly suitable for a screwing system in which the screwing tool is the end of a robot arm with cylindrical outer contour of revolution and inner contour adapted to grip the screw head.
  • the nozzle comprises a nozzle body 1 with a wall generally cylindrical peripheral axis II and surrounding an axial bore 2 containing a valve means 3.
  • the valve means 3 comprises a fixing screw 3a whose axial rod 3b guides a compression spring 3c which pushes a closure ball 3d against a seat 3e of the nozzle body 1.
  • the ball 3d can close the axial bore 2 as the cooling fluid pressure at the inlet 2a of the axial bore 2 does not exceed a determined threshold corresponding to the thrust force of the spring 3b.
  • the peripheral wall 1a of the nozzle body 1 is traversed by a transverse bore 4 communicating with the axial bore 2 and connected to a cooling fluid outlet duct 5.
  • the nozzle body 1 comprises a cylindrical input portion 1b, coaxial axis I-I, shaped for its introduction into a fluid supply port of the engine cylinder housing.
  • a transverse fixing plate 6 is associated with the nozzle body 1 to ensure its attachment to the engine cylinder housing.
  • the transverse fixing plate 6 comprises a first hole 6a in which is fixed the nozzle body 1, by welding or fitting, and comprises a second hole 6b offset laterally opposite the transverse bore 4, for the passage of a fixing screw 7 of the nozzle on the engine cylinder casing.
  • the inter-axis E1 between the axis II of the nozzle body 1 and the axis II-II of the fixing screw 7 must be sufficient to allow a radial clearance between the nozzle body 1 and a screwing tool that is just engaged on the head of the fastening screw 7. This is the reason why the inter-axis E1 must be wide, which makes it necessary to dimension the plate 6 accordingly.
  • the peripheral wall 1 has a thickness T which is greater than or equal to the diameter D of the transverse bore 4.
  • the cooling fluid outlet duct 5 may be an attached tube, force-fitted by its end in the transverse bore 4, which is sufficient to ensure effective maintenance of the fluid outlet conduit 5.
  • the peripheral wall 1a is thinner due to the presence of an external recess 1d with respect to the second hole 6b of the transverse fixing plate 6.
  • a thickness of the portion 1c of peripheral wall is kept just sufficient for the mechanical stresses to be borne, and the external recess 1d makes it possible to bring the II-II axis of the fixing screw 7.
  • the inter-axis E2 of the first hole 6a and second hole 6b of the transverse fixing plate 6, or between-axis between the nozzle body 1 and the fixing screw 7, is just sufficient to allow the engagement and the rotation of a screwing tool 8 on the head of the fixing screw 7 without contact with the peripheral wall 1a of the nozzle body 1.
  • a functional clearance is left between the screwing tool 8 and the nozzle body 1 which facilitates the movement of the screwing tool 8 during its adaptation and removal relative to the fixing screw 7.
  • the external recess 1d is a concave cylindrical surface of axis parallel to the axis II of the nozzle body 1 and coaxial with the axis II-II of the fixing screw 7.
  • the screwing tool 8 as illustrated is the end of a robot arm with a cylindrical outer contour of revolution and an inner contour adapted to grip the screw head 7.
  • the outer recess 1d is a flat parallel to the axis II of the nozzle body 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The nozzle has a peripheral wall (1a) with thickness greater than or equal to diameter of a transversal hole (4), so that an end of a coolant outlet duct is fixed in the hole. The wall is thin due to the presence of an external recess (1d) opposite to a hole of a transversal fixing plate (6). A nozzle body and a fixing screw have a small axis distance between them which is sufficient to rotate a screwing tool on a screw head. The external recess is in a portion opposite to the hole, and permits to connect axes of the nozzle body and the fixing screw.

Description

La présente invention concerne les gicleurs de refroidissement de piston pour moteur à combustion interne, utilisés pour projeter un fluide de refroidissement tel que de l'huile contre le fond de piston, c'est-à-dire contre la face de piston extérieure à la chambre d'explosion.The present invention relates to the piston cooling nozzles for an internal combustion engine, used to project a cooling fluid such as oil against the piston bottom, that is to say against the piston face external to the piston. explosion chamber.

Les gicleurs de refroidissement de piston habituellement utilisés sont des pièces rapportées fixées sur le carter moteur et communiquant avec un orifice d'amenée de fluide de refroidissement. La position du gicleur doit être déterminée avec précision, pour déterminer de façon précise l'impact du jet de fluide de refroidissement sur le fond de piston.The piston cooling nozzles usually used are inserts attached to the crankcase and communicating with a coolant supply port. The position of the nozzle must be accurately determined to accurately determine the impact of the coolant jet on the piston bottom.

On connaît déjà des gicleurs de refroidissement de piston pour moteur à combustion interne comprenant un corps de gicleur à paroi périphérique généralement cylindrique entourant un perçage axial contenant un moyen de clapet. La paroi périphérique est traversée d'un perçage transversal communiquant avec le perçage axial et raccordé à un conduit de sortie de fluide de refroidissement sous forme de tube. Le corps de gicleur comporte une portion cylindrique conformée pour son introduction dans un orifice d'amenée de fluide du carter de cylindre moteur.Piston cooling nozzles for an internal combustion engine are already known comprising a generally cylindrical peripheral wall nozzle body surrounding an axial bore containing a valve means. The peripheral wall is traversed by a transverse bore communicating with the axial bore and connected to a tube of cooling fluid outlet conduit. The nozzle body has a cylindrical portion shaped for its introduction into a fluid supply port of the engine cylinder housing.

Pour fixer le gicleur au carter de cylindre moteur, une première solution, décrite dans le document EP 0 682 175 A1 , consiste à prévoir un gicleur ayant une vis-clapet coaxiale qui se visse dans une portion d'extrémité taraudée de la canalisation d'amenée de fluide. Une plaque transversale rapportée bloque le gicleur en rotation.To fix the nozzle to the engine cylinder casing, a first solution, described in the document EP 0 682 175 A1 , consists in providing a nozzle having a coaxial screw-valve which is screwed into a threaded end portion of the fluid supply pipe. An attached transverse plate blocks the nozzle in rotation.

Une seconde solution habituellement utilisée pour la fixation du gicleur sur le carter de cylindre moteur, décrite dans les documents DE 29 38 431 A1 ou US 4,995,346 , consiste à prévoir une plaque transversale de fixation, comportant un premier trou dans lequel est fixé le corps de gicleur, et comportant un second trou décalé latéralement à l'opposé du perçage transversal, pour le passage d'une vis de fixation du gicleur sur le carter de cylindre moteur.A second solution usually used for fixing the nozzle on the engine cylinder housing, described in the documents DE 29 38 431 A1 or US 4,995,346 , consists in providing a transverse fixing plate, having a first hole in which is fixed the nozzle body, and having a second hole offset laterally opposite the transverse bore, for the passage of a screw fixing the nozzle on the engine cylinder housing.

Cette seconde solution est plus simple à mettre en oeuvre, mais elle présente l'inconvénient d'un encombrement parfois excessif.This second solution is simpler to implement, but it has the disadvantage of a sometimes excessive congestion.

La paroi périphérique du corps de gicleur doit être suffisamment épaisse pour que le perçage axial retienne efficacement le conduit de sortie de fluide de refroidissement.The peripheral wall of the nozzle body must be sufficiently thick for the axial bore to effectively retain the coolant outlet conduit.

La vis de fixation doit avoir un diamètre suffisant pour assurer un serrage suffisant de la plaque de fixation sur le carter de cylindre moteur, évitant tout risque de détachement ou de vibration.The mounting screw must be of sufficient diameter to ensure sufficient clamping of the mounting plate on the engine cylinder housing, avoiding any risk of detachment or vibration.

Ces deux contraintes obligent à conserver un entre-axe relativement large entre l'axe du corps de gicleur et l'axe de la vis de fixation. Cela conduit à des grandes tailles de plaque transversale de fixation.These two constraints make it necessary to maintain a relatively wide distance between the axis of the nozzle body and the axis of the fastening screw. This leads to large sizes of transverse attachment plate.

Or un besoin existe pour réduire la taille de la plaque transversale de fixation et l'encombrement global du gicleur de refroidissement de piston, afin notamment de permettre leur utilisation dans des moteurs et qui laissent une place réduite pour le positionnement du gicleur de refroidissement de piston.However, there is a need to reduce the size of the transverse fixing plate and the overall size of the piston cooling nozzle, in particular to allow their use in motors and which leave a reduced space for the positioning of the piston cooling nozzle .

Le problème proposé par la présente invention est ainsi de concevoir une nouvelle structure de gicleur de refroidissement de piston, dont la fixation s'effectue par une plaque transversale de fixation, dont la taille de la plaque transversale de fixation est réduite, et dont l'entre-axe entre l'axe de la vis de fixation et l'axe du corps de gicleur est également réduit.The problem proposed by the present invention is thus to design a new piston cooling nozzle structure, the fixing of which is carried out by a transverse fixing plate, the size of the transverse fixing plate is reduced, and whose between the axis of the fixing screw and the axis of the nozzle body is also reduced.

Le but est de permettre d'adapter de tels gicleurs dans des moteurs présentant une place réduite pour la fixation du gicleur de refroidissement.The aim is to make it possible to adapt such nozzles in engines having a reduced space for fixing the cooling nozzle.

L'invention vise, simultanément, à assurer un fonctionnement et une fiabilité corrects du gicleur de refroidissement de piston, et notamment un maintien correct du conduit de sortie de fluide de refroidissement et de l'ensemble du gicleur lui-même.The object of the invention is, simultaneously, to ensure correct operation and reliability of the piston cooling nozzle, and in particular a correct retention of the cooling fluid outlet duct and of the entire nozzle itself.

Pour atteindre ces buts ainsi que d'autres, l'invention propose un gicleur de refroidissement de piston pour moteur à combustion interne, comprenant :

  • un corps de gicleur à paroi périphérique entourant un perçage axial contenant un moyen de clapet, la paroi périphérique étant traversée d'un perçage transversal communiquant avec le perçage axial et raccordé à un conduit de sortie de fluide de refroidissement, le corps de gicleur comportant une portion cylindrique d'entrée conformée pour son introduction dans un orifice d'amenée de fluide du carter de cylindre moteur,
  • une plaque transversale de fixation, comportant un premier trou dans lequel est fixé le corps de gicleur, et comportant un second trou décalé latéralement à l'opposé du perçage transversal, pour le passage d'une vis de fixation du gicleur sur le carter de cylindre moteur ;
selon l'invention :
  • au moins autour du perçage transversal, la paroi périphérique est épaisse, son épaisseur T étant supérieure ou égale au diamètre du perçage transversal,
  • dans sa portion diamétralement opposée au perçage transversal, la paroi périphérique est plus mince du fait de la présence d'un évidement externe en regard du second trou de la plaque transversale de fixation.
To achieve these and other objects, the invention provides a piston cooling nozzle for an internal combustion engine, comprising:
  • a circumferential nozzle body surrounding an axial bore containing a valve means, the peripheral wall having a transverse bore therethrough communicating with the axial bore and connected to a coolant outlet conduit, the nozzle body having a cylindrical input portion shaped for its introduction into a fluid supply port of the engine cylinder housing,
  • a transverse fixing plate, comprising a first hole in which is fixed the nozzle body, and having a second hole offset laterally opposite the transverse bore, for the passage of a nozzle fixing screw on the cylinder housing; engine;
according to the invention:
  • at least around the transverse bore, the peripheral wall is thick, its thickness T being greater than or equal to the diameter of the transverse bore,
  • in its portion diametrically opposed to the transverse bore, the peripheral wall is thinner due to the presence of an external recess facing the second hole of the transverse fixing plate.

Grâce à l'épaisseur suffisante de la paroi périphérique, dans la zone retenant le conduit de sortie de fluide, le maintien du conduit est efficace et satisfaisant.Due to the sufficient thickness of the peripheral wall, in the zone retaining the fluid outlet duct, maintaining the duct is effective and satisfactory.

Simultanément, l'évidement externe dans la portion diamétralement opposée de paroi périphérique permet de rapprocher l'axe du corps de gicleur et l'axe de la vis de fixation, tout en permettant la manoeuvre de la vis de fixation par un outil de serrage tel qu'une extrémité de bras de robot.Simultaneously, the external recess in the diametrically opposite portion of the peripheral wall makes it possible to bring the axis of the nozzle body closer to the axis of the fixing screw, while allowing the operation of the fastening screw by a clamping tool such as than a robot arm end.

Un autre avantage est que l'évidement externe réalise un allégement du gicleur de refroidissement de piston, ce qui est favorable dans la recherche actuelle des performances des moteurs.Another advantage is that the outer recess provides relief of the piston cooling nozzle, which is favorable in the current search for engine performance.

De préférence, l'entre-axe des premier et second trous de la plaque transversale de fixation est juste suffisant pour permettre l'engagement et la rotation d'un outil de vissage sur la tête de vis de fixation sans contact avec la paroi périphérique du corps de gicleur.Preferably, the inter-axis of the first and second holes of the transverse fixing plate is just sufficient to allow the engagement and rotation of a screwing tool on the fixing screw head without contact with the peripheral wall of the jet body.

Selon un premier mode de réalisation, l'évidement externe est un méplat parallèle à l'axe du corps de gicleur.According to a first embodiment, the external recess is a flat parallel to the axis of the nozzle body.

Selon un autre mode de réalisation, l'évidement externe est une surface cylindrique concave d'axe parallèle à l'axe du corps de gicleur et coaxiale à l'axe de la vis de fixation. Ce dernier mode de réalisation est particulièrement adapté à un système de vissage dans lequel l'outil de vissage est l'extrémité d'un bras de robot à contour externe cylindrique de révolution et à contour intérieur adapté pour la prise de la tête de vis.According to another embodiment, the external recess is a concave cylindrical surface with an axis parallel to the axis of the nozzle body and coaxial with the axis of the fixing screw. This latter embodiment is particularly suitable for a screwing system in which the screwing tool is the end of a robot arm with cylindrical outer contour of revolution and inner contour adapted to grip the screw head.

D'autres objets, caractéristiques et avantages de la présente invention ressortiront de la description suivante de modes de réalisation particuliers, faite en relation avec les figures jointes, parmi lesquelles :

  • la figure 1 illustre, en perspective, une structure de gicleur de refroidissement de piston selon l'art antérieur, avec un entre-axe relativement important entre le corps de piston et la vis de fixation ;
  • la figure 2 est une vue en perspective illustrant un gicleur de refroidissement de piston selon un premier mode de réalisation de l'invention, associé à la tête de serrage d'un bras de robot ;
  • la figure 3 illustre en perspective un gicleur de refroidissement de piston selon un second mode de réalisation de l'invention ; et
  • la figure 4 est une coupe longitudinale du gicleur de la figure 3.
Other objects, features and advantages of the present invention will become apparent from the following description of particular embodiments, with reference to the accompanying figures, in which:
  • the figure 1 illustrates, in perspective, a piston cooling nozzle structure according to the prior art, with a relatively large between-axis between the piston body and the fixing screw;
  • the figure 2 is a perspective view illustrating a piston cooling nozzle according to a first embodiment of the invention, associated with the clamping head of a robot arm;
  • the figure 3 illustrates in perspective a piston cooling nozzle according to a second embodiment of the invention; and
  • the figure 4 is a longitudinal section of the nozzle of the figure 3 .

Dans les deux modes de réalisation des figures 2 et 3, ainsi que dans la réalisation connue de la figure 1, le gicleur comprend un corps de gicleur 1 à paroi périphérique généralement cylindrique d'axe I-I et entourant un perçage axial 2 contenant un moyen de clapet 3.In both embodiments of the figures 2 and 3 , as well as in the known realization of the figure 1 the nozzle comprises a nozzle body 1 with a wall generally cylindrical peripheral axis II and surrounding an axial bore 2 containing a valve means 3.

Par exemple, comme illustré sur la figure 4, le moyen de clapet 3 comporte une vis de fixation 3a dont la tige axiale 3b guide un ressort de compression 3c qui repousse une bille de fermeture 3d contre un siège 3e du corps de gicleur 1. Ainsi la bille 3d peut obturer le perçage axial 2 tant que la pression de fluide de refroidissement à l'entrée 2a du perçage axial 2 n'excède pas un seuil déterminé correspondant à la force de poussée du ressort 3b.For example, as shown on the figure 4 , the valve means 3 comprises a fixing screw 3a whose axial rod 3b guides a compression spring 3c which pushes a closure ball 3d against a seat 3e of the nozzle body 1. Thus the ball 3d can close the axial bore 2 as the cooling fluid pressure at the inlet 2a of the axial bore 2 does not exceed a determined threshold corresponding to the thrust force of the spring 3b.

La paroi périphérique 1a du corps de gicleur 1 est traversée d'un perçage transversal 4 communiquant avec le perçage axial 2 et raccordé à un conduit de sortie de fluide de refroidissement 5.The peripheral wall 1a of the nozzle body 1 is traversed by a transverse bore 4 communicating with the axial bore 2 and connected to a cooling fluid outlet duct 5.

Le corps de gicleur 1 comporte une portion cylindrique d'entrée 1b, coaxiale d'axe I-I, conformée pour son introduction dans un orifice d'amenée de fluide du carter de cylindre moteur.The nozzle body 1 comprises a cylindrical input portion 1b, coaxial axis I-I, shaped for its introduction into a fluid supply port of the engine cylinder housing.

Une plaque transversale de fixation 6 est associée au corps de gicleur 1 pour assurer sa fixation sur le carter de cylindre moteur. Pour cela, la plaque transversale de fixation 6 comporte un premier trou 6a dans lequel est fixé le corps de gicleur 1, par soudure ou emmanchement, et comporte un second trou 6b décalé latéralement à l'opposé du perçage transversal 4, pour le passage d'une vis de fixation 7 du gicleur sur le carter de cylindre moteur.A transverse fixing plate 6 is associated with the nozzle body 1 to ensure its attachment to the engine cylinder housing. For this, the transverse fixing plate 6 comprises a first hole 6a in which is fixed the nozzle body 1, by welding or fitting, and comprises a second hole 6b offset laterally opposite the transverse bore 4, for the passage of a fixing screw 7 of the nozzle on the engine cylinder casing.

Comme on le voit sur la figure 1, dans les réalisations connues, l'entre-axe E1 entre l'axe I-I du corps de gicleur 1 et l'axe II-II de la vis de fixation 7 doit être suffisant pour laisser un jeu radial entre le corps de gicleur 1 et un outil de vissage que l'on vient engager sur la tête de la vis de fixation 7. C'est la raison pour laquelle l'entre-axe E1 doit être large, ce qui oblige à dimensionner en conséquence la plaque de fixation 6.As we see on the figure 1 in the known embodiments, the inter-axis E1 between the axis II of the nozzle body 1 and the axis II-II of the fixing screw 7 must be sufficient to allow a radial clearance between the nozzle body 1 and a screwing tool that is just engaged on the head of the fastening screw 7. This is the reason why the inter-axis E1 must be wide, which makes it necessary to dimension the plate 6 accordingly.

En considérant maintenant les figures 2 à 4, montrant l'invention, on voit que l'entre-axe E2 peut être réduit, tout en conservant une épaisseur satisfaisante de la paroi périphérique 1 a dans les zones où cela est nécessaire.Now considering the Figures 2 to 4 showing the invention, it can be seen that the inter-axis E2 can be reduced, while maintaining a satisfactory thickness of the peripheral wall 1a in the areas where it is necessary.

Ainsi, sur la figure 4, on voit que la paroi périphérique 1 a présente une épaisseur T qui est supérieure ou égale au diamètre D du perçage transversal 4. De la sorte, le conduit de sortie de fluide de refroidissement 5 peut être un tube rapporté, emmanché en force par son extrémité dans le perçage transversal 4, ce qui suffit à garantir un maintien efficace du conduit de sortie de fluide 5.So, on the figure 4 it can be seen that the peripheral wall 1 has a thickness T which is greater than or equal to the diameter D of the transverse bore 4. In this way, the cooling fluid outlet duct 5 may be an attached tube, force-fitted by its end in the transverse bore 4, which is sufficient to ensure effective maintenance of the fluid outlet conduit 5.

Simultanément, dans la portion diamétralement opposée de la paroi périphérique 1a, c'est-à-dire dans la portion 1c opposée au perçage transversal 4, la paroi périphérique est plus mince du fait de la présence d'un évidement externe 1d au regard du second trou 6b de la plaque transversale de fixation 6. Dans cette zone, on conserve une épaisseur de la portion 1c de paroi périphérique juste suffisante pour les contraintes mécaniques à supporter, et l'évidement externe 1d permet de rapprocher l'axe II-II de la vis de fixation 7.Simultaneously, in the diametrically opposite portion of the peripheral wall 1a, that is to say in the portion 1c opposite to the transverse bore 4, the peripheral wall is thinner due to the presence of an external recess 1d with respect to the second hole 6b of the transverse fixing plate 6. In this zone, a thickness of the portion 1c of peripheral wall is kept just sufficient for the mechanical stresses to be borne, and the external recess 1d makes it possible to bring the II-II axis of the fixing screw 7.

Comme illustré sur la figure 4, l'entre-axe E2 des premier trou 6a et second trou 6b de la plaque transversale de fixation 6, ou entre-axe entre le corps de gicleur 1 et la vis de fixation 7, est juste suffisant pour permettre l'engagement et la rotation d'un outil de vissage 8 sur la tête de la vis de fixation 7 sans contact avec la paroi périphérique 1a du corps de gicleur 1. On laisse, entre l'outil de vissage 8 et le corps de gicleur 1, un jeu fonctionnel qui facilite le mouvement de l'outil de vissage 8 lors de son adaptation et de son retrait par rapport à la vis de fixation 7.As illustrated on the figure 4 , the inter-axis E2 of the first hole 6a and second hole 6b of the transverse fixing plate 6, or between-axis between the nozzle body 1 and the fixing screw 7, is just sufficient to allow the engagement and the rotation of a screwing tool 8 on the head of the fixing screw 7 without contact with the peripheral wall 1a of the nozzle body 1. A functional clearance is left between the screwing tool 8 and the nozzle body 1 which facilitates the movement of the screwing tool 8 during its adaptation and removal relative to the fixing screw 7.

Dans le mode de réalisation des figures 3 et 4, l'évidement externe 1d est une surface cylindrique concave d'axe parallèle à l'axe I-I du corps de gicleur 1 et coaxiale à l'axe II-II de la vis de fixation 7.In the embodiment of Figures 3 and 4 , the external recess 1d is a concave cylindrical surface of axis parallel to the axis II of the nozzle body 1 and coaxial with the axis II-II of the fixing screw 7.

L'outil de vissage 8 tel qu'illustré est l'extrémité d'un bras de robot à contour externe cylindrique de révolution et à contour intérieur adapté pour la prise de la tête de vis 7.The screwing tool 8 as illustrated is the end of a robot arm with a cylindrical outer contour of revolution and an inner contour adapted to grip the screw head 7.

Dans le mode de réalisation illustré sur la figure 2, l'évidement externe 1d est un méplat parallèle à l'axe I-I du corps de gicleur 1.In the embodiment illustrated on the figure 2 , the outer recess 1d is a flat parallel to the axis II of the nozzle body 1.

La présente invention n'est pas limitée aux modes de réalisation qui ont été explicitement décrits, mais elle en inclut les diverses variantes et généralisations contenues dans le domaine des revendications ci-après.The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof within the scope of the claims below.

Claims (5)

  1. Internal combustion engine piston cooling nozzle comprising :
    - a nozzle body (1) with a peripheral wall (1a) around an axial bore (2) containing valve means (3), a transverse bore (4) communicating with the axial bore (2) passing through the peripheral wall (1 a) and being connected to a cooling fluid outlet duct (5), the nozzle body (1) having a cylindrical inlet portion (1b) conformed to be inserted into a fluid feed orifice of an engine cylinder block,
    - a transverse fixing plate (6) having a first hole (6a) into which the nozzle body (1) is fixed, and having a laterally offset second hole (6b) opposite the transverse bore (4) for a screw (7) for fixing the nozzle to the engine cylinder block to pass through, characterized in that :
    - at least around the transverse bore (4), the peripheral wall (1a) is thick, its thickness T being greater than or equal to the diameter (D) of the transverse bore (4),
    - the peripheral wall (1a) has a thinner portion (1c) diametrally opposite the transverse bore (4) because of the presence of an external recess (1d) facing the second hole (6b) in the transverse fixing plate (6).
  2. Piston cooling nozzle according to claim 1, characterized in that the distance between axes (E2) of the first and second holes (6a, 6b) of the transverse fixing plate (6) is just sufficient to enable the engagement of a screwing tool (8) over a head of the fixing screw (7) and rotation thereof without coming into contact with the peripheral wall (1a) of the nozzle body (1).
  3. Piston cooling nozzle according to claim 2, characterized in that the screwing tool (8) is an end of a robot arm with a circular cylindrical external contour and an internal contour adapted to grasp the head of the screw (7).
  4. Piston cooling nozzle according to any of claims 1 to 3, characterized in that the external recess (1 d) is a flat parallel to an axis (I-I) of the nozzle body (1).
  5. Piston cooling nozzle according to any of claims 1 to 3, characterized in that the external recess (1d) is a concave cylindrical surface having an axis parallel to an axis (I-I) of the nozzle body (1) and coaxial with an axis (II-II) of the fixing screw (7).
EP04356176A 2003-11-04 2004-11-03 Jet for piston cooling with reduced inter-axle Active EP1529935B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0313248A FR2861804B1 (en) 2003-11-04 2003-11-04 PISTON COOLING JET WITH REDUCED AXIS
FR0313248 2003-11-04

Publications (2)

Publication Number Publication Date
EP1529935A1 EP1529935A1 (en) 2005-05-11
EP1529935B1 true EP1529935B1 (en) 2011-06-01

Family

ID=34429976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04356176A Active EP1529935B1 (en) 2003-11-04 2004-11-03 Jet for piston cooling with reduced inter-axle

Country Status (7)

Country Link
US (1) US7104225B2 (en)
EP (1) EP1529935B1 (en)
CN (1) CN1287072C (en)
AT (1) ATE511599T1 (en)
AU (1) AU2004226948B2 (en)
BR (1) BRPI0404650A (en)
FR (1) FR2861804B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9074516B2 (en) 2008-09-09 2015-07-07 Bontaz Centre R&D Device for controlling supply of a system with a fluid

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8397749B2 (en) * 2007-09-07 2013-03-19 Metaldyne Company Llc Piston cooling jet with tracking ball orifice
CN101886570B (en) * 2010-06-02 2012-02-29 奇瑞汽车股份有限公司 Piston cooling spray nozzle structure
FR3004489B1 (en) 2013-04-11 2017-04-28 Bontaz Centre R & D COOLING DEVICE FOR A REDUCED INTERNAL COMBUSTION ENGINE AND METHOD FOR MANUFACTURING SUCH A DEVICE
CN104533588A (en) * 2014-12-26 2015-04-22 山东华源莱动内燃机有限公司 Piston cooling nozzle
GB201519640D0 (en) * 2015-11-06 2015-12-23 Gm Global Tech Operations Inc Piston cooling jet for an internal combustion engine
FR3109608B1 (en) * 2020-04-22 2023-01-13 Bontaz Centre R & D DOUBLE JET PISTON COOLING JET IN PLASTIC MATERIAL

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2938431A1 (en) * 1979-09-22 1981-03-26 Daimler-Benz Aktiengesellschaft, 70567 Stuttgart Supercharged fuel injection IC engine - has pistons cooled by oil injector fixed to flange of crankshaft
US4995346A (en) * 1989-06-28 1991-02-26 Sharon Manufacturing Company Oil jet piston cooler
FR2719868B1 (en) * 1994-05-10 1996-06-21 Bontaz Centre Piston cooling nozzle for internal combustion engine.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9074516B2 (en) 2008-09-09 2015-07-07 Bontaz Centre R&D Device for controlling supply of a system with a fluid

Also Published As

Publication number Publication date
US20050098122A1 (en) 2005-05-12
EP1529935A1 (en) 2005-05-11
CN1287072C (en) 2006-11-29
FR2861804B1 (en) 2006-01-20
US7104225B2 (en) 2006-09-12
CN1614206A (en) 2005-05-11
AU2004226948A1 (en) 2005-05-19
AU2004226948B2 (en) 2007-05-10
ATE511599T1 (en) 2011-06-15
FR2861804A1 (en) 2005-05-06
BRPI0404650A (en) 2005-06-21

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