EP0682175A1 - Spray nozzle for piston cooling for an internal combustion engine - Google Patents

Spray nozzle for piston cooling for an internal combustion engine Download PDF

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Publication number
EP0682175A1
EP0682175A1 EP95420120A EP95420120A EP0682175A1 EP 0682175 A1 EP0682175 A1 EP 0682175A1 EP 95420120 A EP95420120 A EP 95420120A EP 95420120 A EP95420120 A EP 95420120A EP 0682175 A1 EP0682175 A1 EP 0682175A1
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EP
European Patent Office
Prior art keywords
ring
nozzle body
transverse
nozzle
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP95420120A
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German (de)
French (fr)
Inventor
Yves Bontaz
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Bontaz Centre SA
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Bontaz Centre SA
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Publication date
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Publication of EP0682175A1 publication Critical patent/EP0682175A1/en
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Classifications

    • 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

Definitions

  • the piston cooling nozzles for an internal combustion engine are used to spray a cooling fluid such as oil against the piston bottom, that is to say against the piston face external to the explosion chamber. .
  • the piston cooling nozzles usually used are attachments, fixed to the crankcase and communicating with a coolant supply orifice.
  • the position of the nozzle must be precisely determined, to precisely determine the impact of the jet of coolant on the piston bottom.
  • a known technique consists in providing a one-piece nozzle body, limited by a bearing face and by an opposite fixing face, provided with an axial bore intended to be crossed by a screw for the fluid supply and fixing valve.
  • the axial hole communicates with a transverse hole connected to a coolant outlet injection pipe.
  • the valve screw is shaped and adapted to hold the nozzle body in abutment by its bearing face against the peripheral zone of a fluid supply orifice formed in the wall of the crankcase, and to transmit the coolant. at the entrance of the transverse hole.
  • the screw valve is screwed into a threaded end portion of a cooling pipe opening out through the fluid supply orifice.
  • Centering and rotation locking means make it possible to position the nozzle body in the engine cylinder.
  • these centering and locking means comprise a ball engaged in corresponding housings of the casing and of the nozzle body.
  • Such a one-piece cooling nozzle body is metallic, and can be produced by machining a metal block, or by molding followed by repeat machining. In all cases, it is a complex form of part, leading to a high production cost. In addition, the precision of the cooling fluid jet turns out to be insufficient, the fluid jet obtained being relatively divergent.
  • Also known from document DE-A-34 16 076 is a piston cooling nozzle in which the nozzle body is held by a fixing plate fixed by screws passing through two holes in the plate.
  • the fixing plate has a central projection penetrating inside the nozzle body. This method of attachment is very different from a screw-valve, and requires additional machining in the crankcase wall.
  • the problem proposed by the present invention is to design a new structure of a screw-valve sprinkler for piston cooling which can be produced by a less expensive method than the machining of a block of metal of complex shape, while filling the '' all centering and rotation blocking functions for precise positioning of the nozzle in the engine cylinder, while increasing the precision and concentration of the coolant jet projected on the piston bottom.
  • the piston cooling nozzle body has a complex shape intended to perform multiple functions: certain shaped parts are intended to fulfill the functions of centering and blocking the rotation of the nozzle body in the engine cylinder; other shaped parts are intended to fulfill the function of conduction of the coolant and the seal function between the nozzle body and the crankcase wall, as well as the function of formation and direction of the jet of coolant cooling.
  • the idea is to produce separately, on the one hand, the form portions intended to fulfill the functions of centering and rotation blocking, on the other hand, the form portions ensuring the functions of fluid conduction and sealing, and optionally the shaped portions ensuring the function of formation and direction of the cooling fluid jet.
  • a piston cooling nozzle for an internal combustion engine comprises a nozzle body bounded by a bearing face and by an opposite fixing face and provided with an axial bore intended to be traversed by a screw for fluid supply and fixing valve, the axial bore communicating with a transverse bore connected to a fluid outlet injection pipe of cooling, the screw-valve being shaped and adapted to hold the nozzle body in abutment by its bearing face against the peripheral zone of a port for supplying fluid to the wall of the cylinder casing and to transmit the coolant at the entrance to the transverse hole, with centering and rotation locking means for positioning the nozzle body in the engine cylinder;
  • the nozzle body is produced by integral assembly of a generally cylindrical ring comprising the axial bore and the transverse bore, and of a transverse plate comprising the means for centering and locking in rotation the transverse plate comprises a circular fixing hole s '' fitting by fitting onto a corresponding circular bearing surface of the ring.
  • the transverse plate can be brazed on the circular ring surface.
  • the thickness of the plate can then be less than the height of the circular surface between the bearing face and the shoulder, so that the nozzle body is in abutment against the cylinder block wall by a body portion nozzle in the form of an annular lip ensuring a reinforced seal around the fluid supply orifice.
  • the coolant outlet injection duct is advantageously a curved tube, one end of which is attached in the transverse bore of the ring, and possibly brazed in the transverse bore of Ring. It appears that the jet precision obtained by bending a tube is much better than the precision obtained by machining a metal block. This improvement probably results from the fact that, in the bent tube, the fluid flow remains laminar.
  • a piston cooling nozzle 1 is an attached piece on the cylinder crankcase wall 2, inside the engine, configured to take coolant circulating in a cooling pipe 3 and to project the cooling fluid into the engine cylinder against the bottom 4 of the piston 5, that is to say against the face of the piston which is external to the explosion chamber 6.
  • the nozzle 1 comprises a nozzle body 7, limited by a bearing face 8 and by a fixing face 9 opposite the bearing face.
  • the nozzle body 7 is provided with an axial bore 10 communicating with a transverse bore 11 connected to a coolant outlet injection pipe 12.
  • a screw-valve 13, comprising a threaded rod 14 and a head 15, holds the nozzle body 7.
  • the threaded rod 14 of the screw-valve 13 passes through the axial bore 10 of the nozzle body 7, and is screwed in a portion tapped end of the cooling pipe 3 opening through a fluid supply orifice 16 formed in the wall of the cylinder casing 2.
  • the head 15 of the valve screw 13 comes to bear against the fixing face 9 of the nozzle body 7, to hold the nozzle body 7 in abutment by its bearing face 8 against the peripheral zone of the fluid supply orifice 16 of the cylinder casing wall 2.
  • the screw-valve 13 has an axial bore 17 in which is housed a pressure-sensitive shutter valve, suitable for transmitting the coolant when its pressure in the coolant pipe 3 is greater than a predetermined value, and for closing off the axial bore 17 when the coolant pressure is lower than said predetermined pressure.
  • a pressure-sensitive shutter valve suitable for transmitting the coolant when its pressure in the coolant pipe 3 is greater than a predetermined value, and for closing off the axial bore 17 when the coolant pressure is lower than said predetermined pressure.
  • the cooling fluid escapes radially from the axial bore 17 through lateral holes such as the hole 18, to penetrate into the nozzle body 7 and exit through the axial bore 10 and the injection pipe. output 12.
  • the coolant outlet injection pipe 12 is a curved tube, one end 19 of which is fitted into the transverse bore 11 of the nozzle body 7, and the other end of which is directed towards the piston 5.
  • the piston 5 is shown in its two extreme operating positions, and the cooling fluid jet is illustrated by the dashed line 21.
  • the nozzle body 7 is produced by integral assembly of a generally cylindrical ring 22, comprising the axial bore 10 and the transverse bore 11, and a transverse plate 23 comprising the means of centering and locking in rotation.
  • the end 19 of the curved tube forming the outlet injection duct 12 is attached in the transverse bore 11 of the ring 22, and can advantageously be brazed in this transverse bore 11.
  • the transverse plate 23 has a circular fixing hole 24 fitting by fitting onto a corresponding circular surface 25 of the ring 22.
  • the transverse plate 23 can advantageously be brazed on the circular surface 25 of the ring, or secured by any other means.
  • the circular bearing surface 25 of the ring is limited by a shoulder 26 forming a stop against which the transverse plate 23 comes to bear.
  • the thickness E of the transverse plate 23 is advantageously less than the height H of the circular bearing 25 between the bearing face 8 and the shoulder 26.
  • the axial bore 10 of the ring 22 advantageously comprises a part with a larger cross section 28 and a part with a reduced section 29.
  • the part with a larger cross section 28 forms a coolant distribution chamber around the valve screw 13 , opposite the transverse bore 11 of the ring 22 and opposite the lateral holes 18 of the screw-valve 13.
  • the reduced-section part 29 has guide faces to form a transverse support between the screw-valve 13 and the ring 22 .
  • the means for centering and blocking in rotation the nozzle body 7 on the wall of cylinder housing 2 are formed by the peripheral surface 30 of the transverse plate 23
  • the transverse plate 23 is shaped according to a contour suitably adapted to the corresponding contour of a housing 31 formed in the wall of cylinder housing 2 and in which is inserted the transverse plate 23.
  • the transverse plate 23 bears on the lateral faces of the housing 31 by the two facets 32 and 33.
  • the means for centering and blocking the rotation of the nozzle body 7 further comprise an off-center axial pin 34, protruding from one face of the transverse plate 23, and coming from 'Engage in a corresponding hole 35 in the cylinder block wall 2.
  • FIG. 2 a particular embodiment of the piston 5, comprising a gallery 36 for the passage of cooling fluid inside the piston 5 itself. It is also understood, in this embodiment, the advantage to provide a particularly precise and concentrated coolant jet, allowing injecting all of the cooling fluid inside the gallery 36, even when the piston is distant from the injection pipe 12.
  • An internal combustion engine can thus advantageously comprise cooling nozzles 1 according to the invention, as described above, fixed in the piston chamber or chambers and adapted to each project the cooling fluid in a concentrated jet on the bottom 4 d '' a piston 5.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The nozzle consists of a body (7) bounded by a thrust surface (8) and a fixing surface, and has an aperture (10) to receive a valve. The aperture is also connected to a feed pipe (12) for injecting a cooling fluid, while the valve is designed to hold the body of the nozzle by its thrust surface (8) against the periphery of a fluid feed orifice in the engine crankcase wall. The body of the nozzle is made by assembling a cylindrical ring (22) which is centred and locked by a transverse plate (23). The plate has a circular aperture (24) designed to receive a matching circular projection (25), or else the two components can be welded together. The thickness of the plate is less than the height of the ring's projection, so that the edge of the ring projects above the plate for fastening to the crankcase. <IMAGE>

Description

Les gicleurs de refroidissement de piston pour moteur à combustion interne sont 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 piston cooling nozzles for an internal combustion engine are used to spray a cooling fluid such as oil against the piston bottom, that is to say against the piston face external to the 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 attachments, fixed to the crankcase and communicating with a coolant supply orifice. The position of the nozzle must be precisely determined, to precisely determine the impact of the jet of coolant on the piston bottom.

Une technique connue, décrite par exemple dans le document DE-A-19 57 499, consiste à prévoir un corps de gicleur monobloc, limité par une face d'appui et par une face de fixation opposée, muni d'un perçage axial destiné à être traversé par une vis-clapet d'amenée de fluide et de fixation. Le perçage axial communique avec un perçage transversal raccordé à un conduit d'injection de sortie de fluide de refroidissement. La vis-clapet est conformée et adaptée pour maintenir le corps de gicleur en appui par sa face d'appui contre la zone périphérique d'un orifice d'amenée de fluide ménagé dans la paroi de carter moteur, et pour transmettre le fluide de refroidissement à l'entrée du perçage transversal. La vis-clapet se visse dans une portion d'extrémité taraudée d'une canalisation de refroidissement débouchant par l'orifice d'amenée de fluide. Des moyens de centrage et de blocage en rotation permettent de positionner le corps de gicleur dans le cylindre moteur. Dans ce document, ces moyens de centrage et de blocage comprennent une bille engagée dans des logements correspondants du carter et du corps de gicleur.A known technique, described for example in document DE-A-19 57 499, consists in providing a one-piece nozzle body, limited by a bearing face and by an opposite fixing face, provided with an axial bore intended to be crossed by a screw for the fluid supply and fixing valve. The axial hole communicates with a transverse hole connected to a coolant outlet injection pipe. The valve screw is shaped and adapted to hold the nozzle body in abutment by its bearing face against the peripheral zone of a fluid supply orifice formed in the wall of the crankcase, and to transmit the coolant. at the entrance of the transverse hole. The screw valve is screwed into a threaded end portion of a cooling pipe opening out through the fluid supply orifice. Centering and rotation locking means make it possible to position the nozzle body in the engine cylinder. In this document, these centering and locking means comprise a ball engaged in corresponding housings of the casing and of the nozzle body.

Un tel corps monobloc de gicleur de refroidissement est métallique, et peut être réalisé par usinage d'un bloc de métal, ou par moulage suivi d'un usinage en reprise. Dans tous les cas, il s'agit d'une forme de pièce complexe, conduisant à un coût de production élevé. De plus, la précision du jet de fluide de refroidissement s'avère insuffisante, le jet de fluide obtenu étant relativement divergent.Such a one-piece cooling nozzle body is metallic, and can be produced by machining a metal block, or by molding followed by repeat machining. In all cases, it is a complex form of part, leading to a high production cost. In addition, the precision of the cooling fluid jet turns out to be insufficient, the fluid jet obtained being relatively divergent.

On a pu constater en outre certains défauts d'étanchéité entre le corps de gicleur et la paroi de carter moteur, de sorte qu'une portion du fluide de refroidissement s'échappe directement entre le corps de gicleur et la paroi du carter moteur, et ne parvient pas au piston.It has also been observed certain leaks between the nozzle body and the crankcase wall, so that a portion coolant escapes directly between the nozzle body and the crankcase wall, and does not reach the piston.

On connaît aussi, du document DE-A-34 16 076, un gicleur de refroidissement de piston dans lequel le corps de gicleur est tenu par une plaque de fixation fixée par des vis traversant deux trous de la plaque. La plaque de fixation comporte une excroissance centrale pénétrant à l'intérieur du corps de gicleur. Ce mode de fixation est très différent d'une vis-clapet, et nécessite des usinages supplémentaires dans la paroi de carter moteur.Also known from document DE-A-34 16 076 is a piston cooling nozzle in which the nozzle body is held by a fixing plate fixed by screws passing through two holes in the plate. The fixing plate has a central projection penetrating inside the nozzle body. This method of attachment is very different from a screw-valve, and requires additional machining in the crankcase wall.

Le problème proposé par la présente invention est de concevoir une nouvelle structure de gicleur à vis-clapet pour refroidissement de piston qui puisse être réalisée par un procédé moins onéreux que l'usinage d'un bloc de métal de forme complexe, tout en remplissant l'ensemble des fonctions de centrage et de blocage en rotation pour un positionnement précis du gicleur dans le cylindre moteur, et tout en augmentant la précision et la concentration du jet de fluide de refroidissement projeté sur le fond de piston.The problem proposed by the present invention is to design a new structure of a screw-valve sprinkler for piston cooling which can be produced by a less expensive method than the machining of a block of metal of complex shape, while filling the '' all centering and rotation blocking functions for precise positioning of the nozzle in the engine cylinder, while increasing the precision and concentration of the coolant jet projected on the piston bottom.

La présente invention résulte de l'observation selon laquelle le corps de gicleur de refroidissement de piston présente une forme complexe destinée à remplir des fonctions multiples : certaines parties de forme sont destinées à remplir les fonctions de centrage et de blocage en rotation du corps de gicleur dans le cylindre moteur ; d'autres parties de forme sont destinées à remplir la fonction de conduction du fluide de refroidissement et la fonction d'étanchéité entre le corps de gicleur et la paroi de carter moteur, ainsi que la fonction de formation et de direction du jet de fluide de refroidissement. L'idée est de réaliser de manière séparée d'une part les portions de forme destinées à remplir les fonctions de centrage et de blocage en rotation, d'autre part les portions de forme assurant les fonctions de conduction de fluide et d'étanchéité, et éventuellement les portions de forme assurant la fonction de formation et de direction du jet de fluide de refroidissement.The present invention results from the observation that the piston cooling nozzle body has a complex shape intended to perform multiple functions: certain shaped parts are intended to fulfill the functions of centering and blocking the rotation of the nozzle body in the engine cylinder; other shaped parts are intended to fulfill the function of conduction of the coolant and the seal function between the nozzle body and the crankcase wall, as well as the function of formation and direction of the jet of coolant cooling. The idea is to produce separately, on the one hand, the form portions intended to fulfill the functions of centering and rotation blocking, on the other hand, the form portions ensuring the functions of fluid conduction and sealing, and optionally the shaped portions ensuring the function of formation and direction of the cooling fluid jet.

Pour cela, un gicleur de refroidissement de piston pour moteur à combustion interne selon l'invention comprend un corps de gicleur limité par une face d'appui et par une face de fixation opposées et muni d'un perçage axial destiné à être traversé par une vis-clapet d'amenée de fluide et de fixation, le perçage axial communiquant avec un perçage transversal raccordé à un conduit d'injection de sortie de fluide de refroidissement, la vis-clapet étant conformée et adaptée pour maintenir le corps de gicleur en appui par sa face d'appui contre la zone périphérique d'un orifice d'amenée de fluide de paroi de carter de cylindre et pour transmettre le fluide de refroidissement à l'entrée du perçage transversal, avec des moyens de centrage et de blocage en rotation pour positionner le corps de gicleur dans le cylindre moteur ; le corps de gicleur est réalisé par assemblage solidaire d'une bague généralement cylindrique comportant le perçage axial et le perçage transversal, et d'une plaque transversale comportant les moyens de centrage et de blocage en rotation la plaque transversale comporte un trou circulaire de fixation s'adaptant par emmanchement sur une portée circulaire correspondante de la bague.For this, a piston cooling nozzle for an internal combustion engine according to the invention comprises a nozzle body bounded by a bearing face and by an opposite fixing face and provided with an axial bore intended to be traversed by a screw for fluid supply and fixing valve, the axial bore communicating with a transverse bore connected to a fluid outlet injection pipe of cooling, the screw-valve being shaped and adapted to hold the nozzle body in abutment by its bearing face against the peripheral zone of a port for supplying fluid to the wall of the cylinder casing and to transmit the coolant at the entrance to the transverse hole, with centering and rotation locking means for positioning the nozzle body in the engine cylinder; the nozzle body is produced by integral assembly of a generally cylindrical ring comprising the axial bore and the transverse bore, and of a transverse plate comprising the means for centering and locking in rotation the transverse plate comprises a circular fixing hole s '' fitting by fitting onto a corresponding circular bearing surface of the ring.

Selon un mode de réalisation avantageux, la plaque transversale peut être brasée sur la portée circulaire de bague.According to an advantageous embodiment, the transverse plate can be brazed on the circular ring surface.

Pour augmenter l'étanchéité, on peut avantageusement prévoir un épaulement, limitant la portée circulaire de bague, et formant butée contre laquelle vient porter la plaque. L'épaisseur de la plaque peut alors être inférieure à la hauteur de la portée circulaire entre la face d'appui et l'épaulement, de sorte que le corps de gicleur est en appui contre la paroi de carter de cylindre par une portion de corps de gicleur en forme de lèvre annulaire assurant une étanchéité renforcée autour de l'orifice d'amenée de fluide.To increase the seal, it is advantageous to provide a shoulder, limiting the circular bearing surface of the ring, and forming a stop against which the plate comes to bear. The thickness of the plate can then be less than the height of the circular surface between the bearing face and the shoulder, so that the nozzle body is in abutment against the cylinder block wall by a body portion nozzle in the form of an annular lip ensuring a reinforced seal around the fluid supply orifice.

Pour améliorer la concentration du jet de fluide de refroidissement, le conduit d'injection de sortie de fluide de refroidissement est avantageusement un tube cintré dont une extrémité est rapportée dans l'alésage transversal de la bague, et éventuellement brasée dans l'alésage transversal de bague. Il apparaît en effet que la précision de jet obtenue par cintrage d'un tube est nettement meilleure que la précision obtenue par usinage d'un bloc de métal. Cette amélioration résulte vraisemblablement du fait que, dans le tube cintré, l'écoulement de fluide reste laminaire.To improve the concentration of the coolant jet, the coolant outlet injection duct is advantageously a curved tube, one end of which is attached in the transverse bore of the ring, and possibly brazed in the transverse bore of Ring. It appears that the jet precision obtained by bending a tube is much better than the precision obtained by machining a metal block. This improvement probably results from the fact that, in the bent tube, the fluid flow remains laminar.

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 est une demi-vue de côté en coupe montrant un gicleur de refroidissement selon l'invention associé à un cylindre moteur dans un premier mode de réalisation de piston ;
  • la figure 2 est une demi-vue de côté en coupe montrant un gicleur de refroidissement selon l'invention associé à un cylindre moteur dans un second mode de réalisation de piston, et dans un second mode de réalisation du corps de gicleur selon l'invention ;
  • la figure 3 est une vue de dessous de l'ensemble de la figure 1, dans un premier mode de réalisation du corps de gicleur selon l'invention ;
  • la figure 4 est une vue de dessous de l'ensemble de la figure 2 dans un second mode de réalisation du corps de gicleur selon la présente invention ;
  • la figure 5 est une vue de dessous du corps de gicleur de la figure 3 ; et
  • la figure 6 est une vue de face en coupe transversale selon le plan A-A de la figure 5.
Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, given in relation to the attached figures, among which:
  • Figure 1 is a half side view in section showing a cooling nozzle according to the invention associated with a driving cylinder in a first embodiment of the piston;
  • Figure 2 is a half side view in section showing a cooling nozzle according to the invention associated with a driving cylinder in a second embodiment of piston, and in a second embodiment of the nozzle body according to the invention ;
  • Figure 3 is a bottom view of the assembly of Figure 1, in a first embodiment of the nozzle body according to the invention;
  • Figure 4 is a bottom view of the assembly of Figure 2 in a second embodiment of the nozzle body according to the present invention;
  • Figure 5 is a bottom view of the nozzle body of Figure 3; and
  • FIG. 6 is a front view in cross section along the plane AA of FIG. 5.

Comme illustré sur les figures 1 et 2, un gicleur 1 de refroidissement de piston est une pièce rapportée sur la paroi de carter de cylindre 2, à l'intérieur du moteur, conformée pour prélever du fluide de refroidissement circulant dans une canalisation de refroidissement 3 et pour projeter le fluide de refroidissement dans le cylindre moteur contre le fond 4 du piston 5 c'est-à-dire contre la face de piston qui est extérieure à la chambre d'explosion 6.As illustrated in FIGS. 1 and 2, a piston cooling nozzle 1 is an attached piece on the cylinder crankcase wall 2, inside the engine, configured to take coolant circulating in a cooling pipe 3 and to project the cooling fluid into the engine cylinder against the bottom 4 of the piston 5, that is to say against the face of the piston which is external to the explosion chamber 6.

Le gicleur 1 comprend un corps de gicleur 7, limité par une face d'appui 8 et par une face de fixation 9 opposée à la face d'appui. Le corps de gicleur 7 est muni d'un perçage axial 10 communiquant avec un perçage transversal 11 raccordé à un conduit d'injection de sortie de fluide de refroidissement 12.The nozzle 1 comprises a nozzle body 7, limited by a bearing face 8 and by a fixing face 9 opposite the bearing face. The nozzle body 7 is provided with an axial bore 10 communicating with a transverse bore 11 connected to a coolant outlet injection pipe 12.

Une vis-clapet 13, comportant une tige filetée 14 et une tête 15, maintient le corps de gicleur 7. La tige filetée 14 de la vis-clapet 13 traverse le perçage axial 10 du corps de gicleur 7, et se visse dans une portion d'extrémité taraudée de la canalisation de refroidissement 3 débouchant par un orifice d'amenée de fluide 16 ménagé dans la paroi de carter de cylindre 2. La tête 15 de vis-clapet 13 vient porter contre la face de fixation 9 du corps de gicleur 7, pour maintenir le corps de gicleur 7 en appui par sa face d'appui 8 contre la zone périphérique de l'orifice d'amenée de fluide 16 de paroi de carter de cylindre 2.A screw-valve 13, comprising a threaded rod 14 and a head 15, holds the nozzle body 7. The threaded rod 14 of the screw-valve 13 passes through the axial bore 10 of the nozzle body 7, and is screwed in a portion tapped end of the cooling pipe 3 opening through a fluid supply orifice 16 formed in the wall of the cylinder casing 2. The head 15 of the valve screw 13 comes to bear against the fixing face 9 of the nozzle body 7, to hold the nozzle body 7 in abutment by its bearing face 8 against the peripheral zone of the fluid supply orifice 16 of the cylinder casing wall 2.

La vis-clapet 13 comporte un alésage axial 17 dans lequel est logé un clapet d'obturation sensible à la pression, adapté pour transmettre le fluide de refroidissement lorsque sa pression dans la canalisation de refroidissement 3 est supérieure à une valeur prédéterminée, et pour obturer l'alésage axial 17 lorsque la pression de fluide de refroidissement est inférieure à ladite pression prédéterminée. En sortie du clapet, le fluide de refroidissement s'échappe radialement de l'alésage axial 17 par des trous latéraux tels que le trou 18, pour pénétrer dans le corps de gicleur 7 et sortir par le perçage axial 10 et le conduit d'injection de sortie 12.The screw-valve 13 has an axial bore 17 in which is housed a pressure-sensitive shutter valve, suitable for transmitting the coolant when its pressure in the coolant pipe 3 is greater than a predetermined value, and for closing off the axial bore 17 when the coolant pressure is lower than said predetermined pressure. At the outlet of the valve, the cooling fluid escapes radially from the axial bore 17 through lateral holes such as the hole 18, to penetrate into the nozzle body 7 and exit through the axial bore 10 and the injection pipe. output 12.

Le conduit d'injection de sortie 12 de fluide de refroidissement est un tube cintré dont une extrémité 19 est rapportée dans le perçage transversal 11 du corps de gicleur 7, et dont l'autre extrémité 20 est dirigée vers le piston 5. Sur les figures 1 et 2, le piston 5 est représenté dans ses deux positions extrêmes de fonctionnement, et le jet de fluide de refroidissement est illustré par le trait mixte 21. On comprend l'intérêt d'une bonne précision d'orientation et de concentration du jet 21 de fluide de refroidissement, pour frapper le piston 5 en une zone appropriée favorisant la répartition du fluide de refroidissement sur le fond 4 de piston, quelle que soit la position du piston 5 le long de sa course.The coolant outlet injection pipe 12 is a curved tube, one end 19 of which is fitted into the transverse bore 11 of the nozzle body 7, and the other end of which is directed towards the piston 5. In the figures 1 and 2, the piston 5 is shown in its two extreme operating positions, and the cooling fluid jet is illustrated by the dashed line 21. We understand the advantage of good orientation accuracy and concentration of the jet 21 of coolant, to strike the piston 5 in a suitable zone favoring the distribution of the coolant on the bottom 4 of the piston, whatever the position of the piston 5 along its stroke.

Il est pour cela nécessaire de prévoir des moyens de centrage et de blocage en rotation du corps de gicleur 7 sur la paroi de carter de cylindre 2.For this it is necessary to provide means for centering and blocking in rotation the nozzle body 7 on the wall of the cylinder casing 2.

Selon l'invention, comme illustré plus en détail sur les figures 5 et 6, le corps de gicleur 7 est réalisé par assemblage solidaire d'une bague 22 généralement cylindrique, comportant le perçage axial 10 et le perçage transversal 11, et d'une plaque transversale 23 comportant les moyens de centrage et de blocage en rotation. L'extrémité 19 du tube cintré formant le conduit d'injection de sortie 12 est rapportée dans le perçage transversal 11 de la bague 22, et peut avantageusement être brasée dans ce perçage transversal 11.According to the invention, as illustrated in more detail in FIGS. 5 and 6, the nozzle body 7 is produced by integral assembly of a generally cylindrical ring 22, comprising the axial bore 10 and the transverse bore 11, and a transverse plate 23 comprising the means of centering and locking in rotation. The end 19 of the curved tube forming the outlet injection duct 12 is attached in the transverse bore 11 of the ring 22, and can advantageously be brazed in this transverse bore 11.

La plaque transversale 23 comporte un trou circulaire 24 de fixation s'adaptant par emmanchement sur une portée circulaire 25 correspondante de la bague 22. La plaque transversale 23 peut avantageusement être brasée sur la portée circulaire 25 de bague, ou solidarisée par tout autre moyen.The transverse plate 23 has a circular fixing hole 24 fitting by fitting onto a corresponding circular surface 25 of the ring 22. The transverse plate 23 can advantageously be brazed on the circular surface 25 of the ring, or secured by any other means.

Dans le mode de réalisation représenté, la portée circulaire 25 de bague est limitée par un épaulement 26 formant butée contre laquelle vient porter la plaque transversale 23. L'épaisseur E de la plaque transversale 23 est avantageusement inférieure à la hauteur H de la portée circulaire 25 entre la face d'appui 8 et l'épaulement 26. De cette façon, le corps de gicleur 7 vient en appui contre la paroi de carter de cylindre 2 par une portion de corps de gicleur 7 en forme de lèvre annulaire 27, assurant une étanchéité renforcée autour de l'orifice d'amenée de fluide 16.In the embodiment shown, the circular bearing surface 25 of the ring is limited by a shoulder 26 forming a stop against which the transverse plate 23 comes to bear. The thickness E of the transverse plate 23 is advantageously less than the height H of the circular bearing 25 between the bearing face 8 and the shoulder 26. In this way, the nozzle body 7 comes to bear against the cylinder casing wall 2 by a portion of nozzle body 7 in the form of an annular lip 27, ensuring a reinforced seal around the fluid supply orifice 16.

Le perçage axial 10 de la bague 22 comprend avantageusement une partie à plus grande section transversale 28 et une partie à section réduite 29. La partie à plus grande section transversale 28 forme une chambre de répartition de fluide de refroidissement autour de la vis-clapet 13, en regard du perçage transversal 11 de bague 22 et en regard des trous latéraux 18 de la vis-clapet 13. La partie à section réduite 29 comporte des faces de guidage pour constituer un appui transversal entre la vis-clapet 13 et la bague 22.The axial bore 10 of the ring 22 advantageously comprises a part with a larger cross section 28 and a part with a reduced section 29. The part with a larger cross section 28 forms a coolant distribution chamber around the valve screw 13 , opposite the transverse bore 11 of the ring 22 and opposite the lateral holes 18 of the screw-valve 13. The reduced-section part 29 has guide faces to form a transverse support between the screw-valve 13 and the ring 22 .

Dans le mode de réalisation illustré sur les figures 1, 3, et 6, les moyens de centrage et de blocage en rotation du corps de gicleur 7 sur la paroi de carter de cylindre 2 sont formés par la surface périphérique 30 de la plaque transversale 23. Pour cela, la plaque transversale 23 est conformée selon un contour s'adaptant de façon appropriée au contour correspondant d'un logement 31 ménagé dans la paroi de carter de cylindre 2 et dans lequel est insérée la plaque transversale 23. Dans la réalisation représentée, la plaque transversale 23 porte sur les faces latérales du logement 31 par les deux facettes 32 et 33.In the embodiment illustrated in FIGS. 1, 3, and 6, the means for centering and blocking in rotation the nozzle body 7 on the wall of cylinder housing 2 are formed by the peripheral surface 30 of the transverse plate 23 For this, the transverse plate 23 is shaped according to a contour suitably adapted to the corresponding contour of a housing 31 formed in the wall of cylinder housing 2 and in which is inserted the transverse plate 23. In the embodiment shown , the transverse plate 23 bears on the lateral faces of the housing 31 by the two facets 32 and 33.

Dans le mode de réalisation illustré sur les figures 2 et 4, les moyens de centrage et de blocage en rotation du corps de gicleur 7 comprennent en outre une goupille axiale 34 décentrée, dépassant d'une face de la plaque transversale 23, et venant s'engager dans un trou correspondant 35 de la paroi de carter de cylindre 2.In the embodiment illustrated in FIGS. 2 and 4, the means for centering and blocking the rotation of the nozzle body 7 further comprise an off-center axial pin 34, protruding from one face of the transverse plate 23, and coming from 'Engage in a corresponding hole 35 in the cylinder block wall 2.

On remarquera, sur la figure 2, un mode de réalisation particulier du piston 5, comportant une galerie 36 pour le passage de fluide de refroidissement à l'intérieur même du piston 5. On comprend également, dans ce mode de réalisation, l'intérêt de prévoir un jet de fluide de refroidissement particulièrement précis et concentré, permettant d'injecter la totalité du fluide de refroidissement à l'intérieur de la galerie 36, même lorsque le piston est éloigné du conduit d'injection 12.It will be noted, in FIG. 2, a particular embodiment of the piston 5, comprising a gallery 36 for the passage of cooling fluid inside the piston 5 itself. It is also understood, in this embodiment, the advantage to provide a particularly precise and concentrated coolant jet, allowing injecting all of the cooling fluid inside the gallery 36, even when the piston is distant from the injection pipe 12.

Un moteur à combustion interne peut ainsi comprendre avantageusement des gicleurs de refroidissement 1 selon l'invention, tels que décrits précédemment, fixés dans la ou les chambres de piston et adaptés pour projeter chacun le fluide de refroidissement en un jet concentré sur le fond 4 d'un piston 5.An internal combustion engine can thus advantageously comprise cooling nozzles 1 according to the invention, as described above, fixed in the piston chamber or chambers and adapted to each project the cooling fluid in a concentrated jet on the bottom 4 d '' a piston 5.

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 contained in the field of claims below.

Claims (10)

1 - Gicleur (1) de refroidissement de piston (5) pour moteur à combustion interne, comprenant un corps de gicleur (7) limité par une face d'appui (8) et par une face de fixation (9) opposées et muni d'un perçage axial (10) destiné à être traversé par une vis-clapet (13) d'amenée de fluide et de fixation, le perçage axial (10) communiquant avec un perçage transversal (11) raccordé à un conduit d'injection de sortie de fluide de refroidissement (12), la vis-clapet (13) étant conformée et adaptée pour maintenir le corps de gicleur (7) en appui par sa face d'appui (8) contre la zone périphérique d'un orifice d'amenée de fluide (16) de paroi de carter de cylindre (2) et pour transmettre le fluide de refroidissement à l'entrée du perçage transversal (11), avec des moyens de centrage et de blocage en rotation pour positionner le corps de gicleur (7) dans le cylindre moteur, caractérisé en ce que : - le corps de gicleur (7) est réalisé par assemblage solidaire d'une bague (22) généralement cylindrique comportant le perçage axial (10) et le perçage transversal (11), et d'une plaque transversale (23) comportant les moyens de centrage et de blocage en rotation, - la plaque transversale (23) comporte un trou circulaire (24) de fixation s'adaptant par emmanchement sur une portée circulaire (25) correspondante de la bague (22). 1 - Nozzle (1) for cooling the piston (5) for an internal combustion engine, comprising a nozzle body (7) bounded by a support face (8) and by a fixing face (9) opposite and provided with '' an axial bore (10) intended to be traversed by a screw-valve (13) for supplying fluid and fixing, the axial bore (10) communicating with a transverse bore (11) connected to an injection pipe of coolant outlet (12), the valve screw (13) being shaped and adapted to keep the nozzle body (7) in abutment by its bearing face (8) against the peripheral zone of an orifice fluid supply (16) from the cylinder block wall (2) and for transmitting the coolant to the inlet of the transverse bore (11), with means for centering and locking in rotation for positioning the nozzle body ( 7) in the engine cylinder, characterized in that: - The nozzle body (7) is produced by integral assembly of a generally cylindrical ring (22) comprising the axial bore (10) and the transverse bore (11), and of a transverse plate (23) comprising the means of centering and locking in rotation, - The transverse plate (23) has a circular hole (24) for fixing fitting by fitting onto a circular surface (25) corresponding to the ring (22). 2 - Gicleur selon la revendication 1, caractérisé en ce que la plaque transversale (23) est en outre brasée sur la portée circulaire (25) de bague. 2 - Sprinkler according to claim 1, characterized in that the transverse plate (23) is also brazed on the circular bearing surface (25) of the ring. 3 - Gicleur selon l'une des revendications 1 ou 2, caractérisé en ce que la portée circulaire (25) de bague est limitée par un épaulement (26) formant butée contre laquelle vient porter la plaque transversale (23). 3 - Sprinkler according to one of claims 1 or 2, characterized in that the circular bearing surface (25) of the ring is limited by a shoulder (26) forming a stop against which comes to bear the transverse plate (23). 4 - Gicleur selon la revendication 3, caractérisé en ce que l'épaisseur (E) de la plaque transversale (23) est inférieure à la hauteur (H) de la portée circulaire (25) entre la face d'appui (8) et l'épaulement (26), de sorte que le corps de gicleur (7) vient en appui contre la paroi de carter de cylindre (2) par une portion de corps de gicleur en forme de lèvre annulaire (27), assurant une étanchéité renforcée autour de l'orifice d'amenée de fluide (16). 4 - Sprinkler according to claim 3, characterized in that the thickness (E) of the transverse plate (23) is less than the height (H) of the circular surface (25) between the bearing face (8) and the shoulder (26), so that the nozzle body (7) bears against the cylinder casing wall (2) by a portion of the nozzle body in the form of an annular lip (27), ensuring a reinforced seal around the fluid supply orifice (16). 5 - Gicleur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le conduit d'injection de sortie de fluide de refroidissement (12) est un tube cintré dont une extrémité (19) est rapportée dans le perçage transversal (11) de la bague (22). 5 - Nozzle according to any one of claims 1 to 4, characterized in that the fluid outlet injection pipe of cooling (12) is a curved tube, one end (19) of which is added in the transverse bore (11) of the ring (22). 6 - Gicleur selon la revendication 5, caractérisé en ce que l'extrémité rapportée (19) du conduit d'injection de sortie de fluide de refroidissement (12) est en outre brasée dans le perçage transversal (11) de bague. 6 - Nozzle according to claim 5, characterized in that the attached end (19) of the cooling fluid outlet injection duct (12) is also brazed in the transverse bore (11) of the ring. 7 - Gicleur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le perçage axial (10) de bague (22) comprend : - une partie à plus grande section transversale (28), formant une chambre de répartition de fluide de refroidissement autour de la vis-clapet (13) et en regard du perçage transversal (11), - une partie à section réduite (29) comportant des faces de guidage pour constituer un appui transversal entre la vis-clapet (13) et la bague (22). 7 - Sprinkler according to any one of claims 1 to 6, characterized in that the axial bore (10) of the ring (22) comprises: a part with a larger cross section (28), forming a coolant distribution chamber around the screw-valve (13) and facing the transverse bore (11), - A section of reduced section (29) comprising guide faces to constitute a transverse support between the screw-valve (13) and the ring (22). 8 - Gicleur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les moyens de centrage et de blocage en rotation du corps de gicleur (7) sont formés par la surface périphérique (30) de la plaque transversale (23). 8 - nozzle according to any one of claims 1 to 7, characterized in that the means for centering and blocking the rotation of the nozzle body (7) are formed by the peripheral surface (30) of the transverse plate (23) . 9 - Gicleur selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les moyens de centrage et de blocage en rotation du corps de gicleur (7) comprennent une goupille axiale (34) décentrée dépassant d'une face de la plaque transversale (23) et venant s'engager dans un trou correspondant (35) de la paroi de carter de cylindre (2). 9 - Sprinkler according to any one of claims 1 to 8, characterized in that the means for centering and blocking the rotation of the sprinkler body (7) comprise an axial pin (34) which is off-center projecting from one face of the plate transverse (23) and coming to engage in a corresponding hole (35) in the cylinder block wall (2). 10 - Moteur à combustion interne comprenant des gicleurs de refroidissement (1) selon l'une quelconque des revendications 1 à 9, fixés dans la ou les chambres de piston et adaptés pour projeter chacun le fluide de refroidissement en un jet concentré sur le fond (4) d'un piston ( 5). 10 - Internal combustion engine comprising cooling jets (1) according to any one of claims 1 to 9, fixed in the piston chamber or chambers and adapted to each project the cooling fluid in a concentrated jet on the bottom ( 4) a piston (5).
EP95420120A 1994-05-10 1995-05-05 Spray nozzle for piston cooling for an internal combustion engine Withdrawn EP0682175A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9405916 1994-05-10
FR9405916A FR2719868B1 (en) 1994-05-10 1994-05-10 Piston cooling nozzle for internal combustion engine.

Publications (1)

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EP0682175A1 true EP0682175A1 (en) 1995-11-15

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EP95420120A Withdrawn EP0682175A1 (en) 1994-05-10 1995-05-05 Spray nozzle for piston cooling for an internal combustion engine

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EP (1) EP0682175A1 (en)
FR (1) FR2719868B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340578A (en) * 1998-08-13 2000-02-23 Cummins Engine Co Ltd Mounting a nozzle on an engine block to direct cooling oil at the underside of a reciprocating piston
EP1273774A1 (en) * 2001-07-04 2003-01-08 Bontaz Centre Nozzle for piston cooling
EP1394376A1 (en) * 2002-09-02 2004-03-03 Bontaz Centre Spray nozzle with multiple jets for cooling an internal combustion engine and engine with such nozzle
FR2861804A1 (en) * 2003-11-04 2005-05-06 Bontaz Centre Sa PISTON COOLING JET WITH REDUCED AXIS
CN101865015A (en) * 2010-06-02 2010-10-20 奇瑞汽车股份有限公司 Piston cooling nozzle
WO2013150827A1 (en) * 2012-04-04 2013-10-10 トヨタ自動車株式会社 Oil jet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3067770B1 (en) * 2017-06-16 2020-08-14 Bontaz Centre R & D CAPTIVE SCREW JET

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DE1957499A1 (en) * 1969-11-15 1971-05-27 Maschf Augsburg Nuernberg Ag Fixation of machine parts against twisting
DE3416076A1 (en) * 1983-06-22 1985-01-10 Tatra N.P., Kop&rcaron;ivnice Injection nozzle for spraying a piston with oil
EP0346264A2 (en) * 1988-06-07 1989-12-13 Stanadyne Automotive Corp. Spray nozzle assembly for piston cooling
JPH0275717A (en) * 1988-09-09 1990-03-15 Honda Motor Co Ltd Cooling device for piston
EP0423830A1 (en) * 1989-10-20 1991-04-24 Cummins Engine Company, Inc. Piston cooling nozzle

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DE1957499A1 (en) * 1969-11-15 1971-05-27 Maschf Augsburg Nuernberg Ag Fixation of machine parts against twisting
DE3416076A1 (en) * 1983-06-22 1985-01-10 Tatra N.P., Kop&rcaron;ivnice Injection nozzle for spraying a piston with oil
EP0346264A2 (en) * 1988-06-07 1989-12-13 Stanadyne Automotive Corp. Spray nozzle assembly for piston cooling
JPH0275717A (en) * 1988-09-09 1990-03-15 Honda Motor Co Ltd Cooling device for piston
EP0423830A1 (en) * 1989-10-20 1991-04-24 Cummins Engine Company, Inc. Piston cooling nozzle

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340578A (en) * 1998-08-13 2000-02-23 Cummins Engine Co Ltd Mounting a nozzle on an engine block to direct cooling oil at the underside of a reciprocating piston
EP1273774A1 (en) * 2001-07-04 2003-01-08 Bontaz Centre Nozzle for piston cooling
FR2827009A1 (en) * 2001-07-04 2003-01-10 Bontaz Centre Sa COOLING JET WITH PISTON
US6672262B2 (en) 2001-07-04 2004-01-06 Bontaz Centre Piston cooling nozzle
CN100404812C (en) * 2001-07-04 2008-07-23 邦塔兹中心股份有限公司 Piston cooling nozzle
EP1394376A1 (en) * 2002-09-02 2004-03-03 Bontaz Centre Spray nozzle with multiple jets for cooling an internal combustion engine and engine with such nozzle
WO2004020800A1 (en) * 2002-09-02 2004-03-11 Bontaz Centre Multi-jet nozzle for engine cooling and engines equipped with such nozzles
US7104225B2 (en) 2003-11-04 2006-09-12 Bontaz Centre Piston cooling nozzle with small distance between axes
EP1529935A1 (en) * 2003-11-04 2005-05-11 Bontaz Centre Jet for piston cooling with reduced inter-axle
AU2004226948B2 (en) * 2003-11-04 2007-05-10 Bontaz Centre Piston cooling nozzle with small distance between axes
FR2861804A1 (en) * 2003-11-04 2005-05-06 Bontaz Centre Sa PISTON COOLING JET WITH REDUCED AXIS
CN101865015A (en) * 2010-06-02 2010-10-20 奇瑞汽车股份有限公司 Piston cooling nozzle
WO2013150827A1 (en) * 2012-04-04 2013-10-10 トヨタ自動車株式会社 Oil jet
EP2754862A1 (en) * 2012-04-04 2014-07-16 Toyota Jidosha Kabushiki Kaisha Oil jet
EP2754862A4 (en) * 2012-04-04 2015-01-14 Toyota Motor Co Ltd Oil jet
US9121334B2 (en) 2012-04-04 2015-09-01 Toyota Jidosha Kabushiki Kaisha Oil jet

Also Published As

Publication number Publication date
FR2719868A1 (en) 1995-11-17
FR2719868B1 (en) 1996-06-21

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