EP0335762A1 - Process and device for cooling a piston crown of an internal-combustion engine - Google Patents

Process and device for cooling a piston crown of an internal-combustion engine Download PDF

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Publication number
EP0335762A1
EP0335762A1 EP89400669A EP89400669A EP0335762A1 EP 0335762 A1 EP0335762 A1 EP 0335762A1 EP 89400669 A EP89400669 A EP 89400669A EP 89400669 A EP89400669 A EP 89400669A EP 0335762 A1 EP0335762 A1 EP 0335762A1
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EP
European Patent Office
Prior art keywords
connecting rod
piston
oil
cooling
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89400669A
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German (de)
French (fr)
Inventor
Jacques Bernard
Gilles Simon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0335762A1 publication Critical patent/EP0335762A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/32—Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
    • 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
    • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
    • 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
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins

Definitions

  • the present invention relates to a method and a device for cooling a piston head for an internal combustion engine. It relates more particularly to a similar method and device which make it possible to eliminate the usual specific circuit of piston cooling oil.
  • the principle of the invention is to use a single pipe pierced in the connecting rod to grease the piston pin in the rod end and in the piston bosses and to cool the piston bottom and in particular in the case of 'a piston said to oil gallery.
  • the invention proposes to guide the connecting rod at the bottom by the piston and not at the head by the crankshaft, to groove the lower half-bearing of the connecting rod head and not the upper half-bearing ( in order not to reduce the bearing capacity of the bearing in compression), to carry out a drilling along the rod body to ensure the rise of the oil along the rod, to groove the rod foot ring, to provide a clearance at the level of the piston pin bosses allowing the passage of the oil, and providing one or two nozzles at the end of the connecting rod (depending on whether the piston bottom is sprayed or a gallery is fed) .
  • the cooling of the piston bottom by a circulation of oil passing through a bore along the connecting rod requires ensuring that there is a sufficient supply flow.
  • the oil is evacuated through two calibrated channels 8, 9 and directed, still under pressure, to 2 ports 10, 11 in the shape of the piston.
  • the traces of the lights 10, 11 in the piston are defined by the displacements of the oil jets materialized by the generators of the apex cones A and B and angularly limited by the maximum obliquities of the connecting rod.
  • the oil thus conveyed is injected into the circu gallery area 12 to cool the piston head, before being discharged through the orifices 13, 14 and falling back into the lower casing.

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

Abstract

Process for cooling a piston head (15) of an internal combustion engine of the forced oil circulation type, according to which: - a connecting rod (16) is guided downward by the piston, - the bottom bearing bush (21) of the big end (17) is grooved, - a hole (4) is made the length of the connecting rod body (16) in order to ensure that oil is taken up along the connecting rod, - a groove is made in the ring (5) on the little end of the connecting rod (19), - and a relief (20) is provided on a level with the piston pin bushings in order to admit the oil. <IMAGE>

Description

La présente invention se rapporte à un procédé et un dispositif de refroidissement d'une tête de piston pour un moteur à com­bustion interne. Elle vise plus particulièrement un procédé et un dispositif semblables qui permettent de supprimer le circuit spécifique habituel d'huile de refroidissement du piston.The present invention relates to a method and a device for cooling a piston head for an internal combustion engine. It relates more particularly to a similar method and device which make it possible to eliminate the usual specific circuit of piston cooling oil.

Le principe de l'invention est de se servir d'une canalisation unique percée dans la bielle pour graisser l'axe de piston dans le pied de bielle et dans les bossages de piston et pour re­froidir le fond de piston et notamment dans le cas d'un piston dit à galerie d'huile.The principle of the invention is to use a single pipe pierced in the connecting rod to grease the piston pin in the rod end and in the piston bosses and to cool the piston bottom and in particular in the case of 'a piston said to oil gallery.

A cet effet, et suivant une particularité essentielle, l'inven­tion propose de guider la bielle en pied par le piston et non en tête par le vilebrequin, de rainurer le demi-coussinet in­férieur de tête de bielle et non le demi-coussinet supérieur (afin de ne pas diminuer la capacité de charge du palier en compression), de réaliser un perçage le long du corps de bielle pour assurer la montée de l'huile le long de la bielle, de rai­nurer la bague de pied de bielle, de prévoir un dégagement au niveau des bossages d'axe de piston permettant le passage de l'huile, et de prévoir en pied de bielle un ou deux gicleurs (suivant que l'on arrose le fond de piston ou que l'on alimente une galerie).To this end, and according to an essential characteristic, the invention proposes to guide the connecting rod at the bottom by the piston and not at the head by the crankshaft, to groove the lower half-bearing of the connecting rod head and not the upper half-bearing ( in order not to reduce the bearing capacity of the bearing in compression), to carry out a drilling along the rod body to ensure the rise of the oil along the rod, to groove the rod foot ring, to provide a clearance at the level of the piston pin bosses allowing the passage of the oil, and providing one or two nozzles at the end of the connecting rod (depending on whether the piston bottom is sprayed or a gallery is fed) .

L'intérêt technique d'une telle réalisation se situe :

  • 1°) dans le guidage de la bielle par le piston qui permet de réduire la largeur de la tête de bielle, d'où un allègement de la masse rotative et la longueur de l'axe de piston, d'où dimi­nution de la masse alternative ;
  • 2°) dans la lubrification de l'axe de piston par un graissage sous pression qui permet d'augmenter la capacité de charge de ce palier donc de diminuer la largeur du pied de bielle et des bossages d'axe. On obtient également un meilleur refroidis­sement au niveau du bossage d'axe ;
  • 3°) dans la suppression du circuit d'huile de refroidissement de piston. Il s'agit d'ordinaire d'un circuit spécifique d'ali­mentation des pissettes servant à arroser le fond de piston ou destinées à alimenter les galeries de refroidissement des pis­tons, d'où simplification du montage moteur et diminution des coûts.
The technical interest of such an achievement is:
  • 1) in guiding the connecting rod by the piston which makes it possible to reduce the width of the connecting rod head, hence a reduction in the rotary mass and the length of the piston pin, hence a reduction in mass alternative;
  • 2) in the lubrication of the piston pin by a pressure lubrication which allows to increase the load capacity of this bearing therefore to decrease the width of the big end and pin bosses. Better cooling is also obtained at the axis boss;
  • 3) in removing the piston cooling oil circuit. Usually this is a specific circuit for supplying the wash bottles which is used to water the piston bottom or intended to supply the cooling galleries of the pistons, hence simplifying the engine mounting and reducing costs.

C'est sur ce troisième point que porte l'essentiel des revendi­cations.It is on this third point that the essence of the claims relates.

D'autres particularités et avantages ressortiront plus claire­ment de la description qui suit d'un mode de réalisation pré­féré, donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels :

  • - la figure 1 représente une vue en coupe transversale d'un at­telage mobile montrant le dispositif de refroidissement reven­diqué,
  • - la figure 2 représente une vue en coupe longitudinale de cet attelage mobile,
  • - et la figure 3 représente une section de la tête de piston suivant le plan 3-3 de la figure 2.
Other particularities and advantages will emerge more clearly from the following description of a preferred embodiment, given by way of nonlimiting example, with reference to the appended drawings in which:
  • FIG. 1 represents a cross-sectional view of a movable coupling showing the claimed cooling device,
  • FIG. 2 represents a view in longitudinal section of this movable coupling,
  • - and Figure 3 shows a section of the piston head along plane 3-3 of Figure 2.

Le refroidissement du fond de piston par une circulation d'huile transitant dans un perçage le long de la bielle néces­site de s'assurer que l'on a un débit d'alimentation suffisant.The cooling of the piston bottom by a circulation of oil passing through a bore along the connecting rod requires ensuring that there is a sufficient supply flow.

Pour cela, il est nécessaire de calculer la contrepression due aux forces d'inertie agissant sur l'huile dans la bielle en mouvement en fonction de l'angle de vilebrequin. On constate que l'alimentation en huile ne peut pas être assurée pendant toute la descente de la bielle. Il n'y aura donc montée de l'huile que sur 180° vilebrequin, ce qui permet de positionner convenablement les orifices d'alimentation.For this, it is necessary to calculate the back pressure due to the inertial forces acting on the oil in the connecting rod in motion as a function of the crankshaft angle. It is noted that the oil supply cannot be ensured during the entire descent of the connecting rod. Oil will therefore only rise on the 180 ° crankshaft, which allows the supply ports to be positioned correctly.

En pied de bielle, dans le cas d'un arrosage simple du fond de piston, un simple gicleur convient.At the end of the connecting rod, in the case of simple watering of the piston bottom, a simple nozzle is suitable.

Par contre, dans le cas où l'on souhaite alimenter une galerie d'huile dans le piston par un perçage le long de la bielle, la solution proposée est détaillée ci-après, en référence aux fi­gures 1, 2 et 3 en décrivant le cheminement de l'huile jusqu'à la galerie du piston.On the other hand, in the case where it is desired to supply an oil gallery in the piston by drilling along the connecting rod, the proposed solution is detailed below, with reference to FIGS. 1, 2 and 3, describing the oil flow to the piston gallery.

L'huile arrive sous pression par un orifice 1 du vilebrequin, passe dans une rainure 2 centrale interne du coussinet infé­rieur 21 de vilebrequin et une rainure 3 centrale externe du coussinet supérieur 18 de vilebrequin, ensuite l'huile s'élève dans un canal central 4 percé dans le corps de bielle pour ar­river dans la bague 5 de pied de bielle et contourner l'axe de piston en passant par les rainures 6, 7.The oil flows under pressure through an orifice 1 of the crankshaft passes through an inner central groove 2 of the lower bushing 21 and a crankshaft 3 External central groove of the upper bearing 18 of the crankshaft, then the oil rises in a central channel 4 drilled in the connecting rod body to reach the connecting rod ring 5 and bypass the piston pin through the grooves 6, 7.

Arrivée au sommet de la bielle, l'huile est évacuée par deux canaux calibrés 8, 9 et dirigée, toujours sous pression, vers 2 lumières 10, 11 en forme dans le piston.Arriving at the top of the connecting rod, the oil is evacuated through two calibrated channels 8, 9 and directed, still under pressure, to 2 ports 10, 11 in the shape of the piston.

Les tracés des lumières 10, 11 dans le piston sont définis par les déplacements des jets d'huile matérialisés par les généra­trices des cônes de sommet A et B et limités angulairement par les obliquités maximales de la bielle.The traces of the lights 10, 11 in the piston are defined by the displacements of the oil jets materialized by the generators of the apex cones A and B and angularly limited by the maximum obliquities of the connecting rod.

L'huile ainsi acheminée est injectée dans la galerie circu­ laire 12 pour refroidir la tête de piston, avant d'être évacuée par les orifices 13, 14 et de retomber dans le carter inférieur.The oil thus conveyed is injected into the circu gallery area 12 to cool the piston head, before being discharged through the orifices 13, 14 and falling back into the lower casing.

Claims (5)

1. Procédé de refroidissement d'une tête de piston (15) pour moteur à combustion interne, du type à circulation d'huile forcée, caractérisé en ce qu'il consiste à :
- guider une bielle (16) en pied par le piston,
- rainurer le demi-coussinet inférieur (21) de la tête de bielle (17),
- réaliser un perçage (4) le long du corps de bielle (16) pour assurer la montée de l'huile le long de la bielle,
- rainurer la bague (5) de pied de bielle (19),
- et prévoir un dégagement (20) au niveau des bossages d'axe de piston pour le passage de l'huile.1. A method of cooling a piston head (15) for an internal combustion engine, of the type with forced oil circulation, characterized in that it consists of:
- guide a connecting rod (16) at the bottom by the piston,
- grooving the lower half-bearing (21) of the big end (17),
- drill a hole (4) along the connecting rod body (16) to ensure the rise of the oil along the connecting rod,
- groove the rod end ring (5) (19),
- And provide a clearance (20) at the level of the piston pin bosses for the passage of oil. 2. Procédé suivant la revendication 1, caractérisé en ce qu'il prévoit, en pied de bielle, un gicleur pour arroser un fond de piston.2. Method according to claim 1, characterized in that it provides, at the end of the connecting rod, a nozzle for watering a piston bottom. 3. Procédé suivant la revendication 1, caractérisé en ce qu'il prévoit en pied de bielle, deux gicleurs (8, 9) pour arroser sous pression une galerie d'huile (12) par l'intermédiaire de deux lumières (10, 11) en forme dans le piston.3. Method according to claim 1, characterized in that it provides at the end of the connecting rod, two nozzles (8, 9) for spraying under pressure an oil gallery (12) via two lights (10, 11 ) shaped in the piston. 4. Dispositif pour la mise en oeuvre du procédé conforme à l'une quelconque des revendications 1, 2 et 3, caractérisé en ce que l'huile arrive sous pression par un orifice (1) de vile­brequin, passe dans une rainure (2) centrale interne du cous­sinet inférieur (21) de vilebrequin, et une rainure (3) cen­trale externe du coussinet supérieur (18) de vilebrequin.4. Device for implementing the method according to any one of claims 1, 2 and 3, characterized in that the oil arrives under pressure through an orifice (1) of the crankshaft, passes through a groove (2) inner center of the lower crankshaft bearing (21), and a groove (3) outer central of the upper crankshaft bearing (18). 5. Dispositif suivant la revendication 4, caractérisé en ce que l'huile s'élève dans un canal central (4) percé dans le corps de bielle (16) pour déboucher dans la bague (5) de pied de bielle et contourner l'axe de piston par des rainures (6) et (7).5. Device according to claim 4, characterized in that the oil rises in a central channel (4) drilled in the connecting rod body (16) to open into the ring (5) of the connecting rod foot and bypass the piston pin by grooves (6) and (7).
EP89400669A 1988-03-29 1989-03-10 Process and device for cooling a piston crown of an internal-combustion engine Withdrawn EP0335762A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804069 1988-03-29
FR8804069A FR2629519A1 (en) 1988-03-29 1988-03-29 METHOD AND DEVICE FOR COOLING A PISTON HEAD FOR AN INTERNAL COMBUSTION ENGINE

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EP0335762A1 true EP0335762A1 (en) 1989-10-04

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EP89400669A Withdrawn EP0335762A1 (en) 1988-03-29 1989-03-10 Process and device for cooling a piston crown of an internal-combustion engine

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FR (1) FR2629519A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029950A1 (en) * 2000-06-26 2002-01-03 Volkswagen Ag connecting rod
WO2013170593A1 (en) * 2012-05-16 2013-11-21 郑凌 Cooling system for internal combustion engine piston
CN104088683A (en) * 2014-06-15 2014-10-08 武汉嗨拓科技有限公司 Piston connecting rod group for internal combustion engine and internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19621894B4 (en) * 1995-06-08 2004-07-15 Deutz Ag Internal combustion engine with piston cooling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1112896A (en) * 1954-10-18 1956-03-20 Semt Method and device for cooling the pistons of an internal combustion engine
EP0113320A1 (en) * 1982-12-30 1984-07-11 Max Heidegger Internal-combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1112896A (en) * 1954-10-18 1956-03-20 Semt Method and device for cooling the pistons of an internal combustion engine
EP0113320A1 (en) * 1982-12-30 1984-07-11 Max Heidegger Internal-combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
C. BOSSAGLIA: "Il motore a due tempi di alte prestazioni", 1968, pages 188-191, Automobile Club D'Italia, L'editrice dell' Automobile, Rome, IT *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10029950A1 (en) * 2000-06-26 2002-01-03 Volkswagen Ag connecting rod
WO2013170593A1 (en) * 2012-05-16 2013-11-21 郑凌 Cooling system for internal combustion engine piston
CN104088683A (en) * 2014-06-15 2014-10-08 武汉嗨拓科技有限公司 Piston connecting rod group for internal combustion engine and internal combustion engine

Also Published As

Publication number Publication date
FR2629519A1 (en) 1989-10-06

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