EP2336509B1 - Couvre culasse pour moteurs à combustion interne - Google Patents

Couvre culasse pour moteurs à combustion interne Download PDF

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Publication number
EP2336509B1
EP2336509B1 EP10012552.5A EP10012552A EP2336509B1 EP 2336509 B1 EP2336509 B1 EP 2336509B1 EP 10012552 A EP10012552 A EP 10012552A EP 2336509 B1 EP2336509 B1 EP 2336509B1
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EP
European Patent Office
Prior art keywords
cylinder head
flow
head cover
duct
zone
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.)
Active
Application number
EP10012552.5A
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German (de)
English (en)
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EP2336509A1 (fr
Inventor
Mario Miljanic
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.)
MAN Truck and Bus SE
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MAN Truck and Bus SE
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Publication of EP2336509A1 publication Critical patent/EP2336509A1/fr
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Classifications

    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0433—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a deflection device, e.g. screen
    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/045—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil using compression or decompression of the gas

Definitions

  • the present invention relates to a cylinder head cover for internal combustion engines with crankcase ventilation according to the preamble of claim 1.
  • a generic ⁇ labscheide worn in a cylinder head cover for an internal combustion engine shows the DE 102 47 175 A1 , in which below the bottom of the cylinder head cover a flow channel is formed, which is connected to a crankcase ventilation. Via the flow channel, lubricating oil particles entrained in the blow-by gases are to be separated from the crankcase of the internal combustion engine as efficiently as possible, which are then fed back to the crankcase via a discharge opening.
  • the flow channel in the cylinder head cover is formed on the one hand by a parallel to the upper side bottom wall extending lower side intermediate wall, which is formed as a separate sheet metal component.
  • an integrally formed on the deviseifige bottom wall of the cylinder head cover partition is provided, which approximately doubles the flow path of the flow channel and causes the oil separation favoring flow deflection.
  • the extension of the flow channel should in particular bring about a flow calming in order to additionally improve the oil separation.
  • the patent application EP 1 837 487 A2 teaches a trough-shaped oil separator for a blow-by gas, which is bolted to the underside of a cylinder head cover and forms a partially enclosed flow channel in conjunction with the cylinder head cover.
  • the bottom of the tub-shaped oil separator forms the bottom of the flow channel.
  • the flow channel is provided with a perpendicular to the bottom partition wall, which divides the flow channel into two opposite flow paths and a, a 180 ° deflection causing deflection zone.
  • the lubricating oil separated from the blow-by-gas is removed via a drain opening which is located in a geodetically lower position relative to the inflow and outflow opening.
  • the object of the invention is to improve the generic cylinder head cover with a ⁇ labscheide Road functionally and manufacturing technology and in particular to reduce the component cost and Verrohrungsaufwand. This object is achieved with the features of the independent claims. Advantageous developments of the invention are the subject of the dependent claims.
  • the flow path upstream of the deflection zone is formed with a cross-sectional constriction or compression zone which increases the flow velocity, to which the deflection zone having a larger flow cross-section together with a discharge channel opening at the deflection zone side, which effects or contributes to the increase in cross-section or volume, acts as Calming and separating zone connects.
  • a plurality of cylinder head covers with an oil separation device combine the outflow openings by means of a line connected there to form a common supply line. By means of the common supply line the outflowing gases are fed to a fine oil separator before their return to the clean air side of the internal combustion engine.
  • the drainage channel, in the mounted state of the cylinder head cover is formed by a geodetically sloping down from the deflection zone channel at the lowest point or end of the drain opening for separated lubricating oil is provided back to the crankcase. This will in particular ensures that separated oil is discharged downward and / or does not come into contact with arranged in the cylinder head cover valve actuators or otherwise, moving parts of the engine, is swirled and possibly returned to the vent flow.
  • the drainage channel formed by the side walls and the intermediate wall also opens into the region downstream of the deflection zone into the flow path located downstream of the deflection zone.
  • the outflow channel protrudes downward approximately at a 90 ° angle from the deflection zone or the flow path downstream of the deflection zone.
  • a manufacturing technique and manufacturing technology particularly simple design of the cross-sectional constriction or compression zone can be achieved so that the partition in the plan view of the flow channel is angled or obliquely between the two opposing flow paths, that the first, lying upstream of the deflection flow path in the flow direction of the gases seen reduced, in particular increasingly smaller, which in principle would also be a step-like taper possible.
  • the second flow path from the region of the deflection, starting in the cross section reduced in size, in particular increasingly tapered whereby the flow velocity of the gases in the area after the separation to the discharge opening can be increased again.
  • the flow channel region is an approximately rectangular contour, so that a simple mutual oblique orientation or angling of the partition wall relative to a longitudinal central axis through the flow channel region can achieve a previously described mutual flow path taper, namely once, in the region the first flow path, to the deflection zone and the other, in the region of the second flow path, away from the deflection zone.
  • This ensures that the gas velocity is successively increased gradually to the deflection zone or the gas mixture is compressed, which substantially promotes the separation of the oil particles in the deflection by the subsequent flow calming or relaxation; Thereafter, the flow rate of the gases can increase again up to the outflow opening on the cylinder head cover.
  • the inflow opening to the flow channel is made larger in cross-section than the outflow opening. This promotes a largely turbulence-free, flow-dynamic inflow of blow-by gases into the flow channel with efficient flow rates to an effective crankcase ventilation.
  • An efficient removal of the separated from the blow-by gases oil particles is further achieved by the fact that the flow channel downwardly bounding intermediate wall to the outflow channel increasingly, in particular arcuately drops, so that separated oil particles, for example from the area of the flow channel can drain easily and without further turbulence quickly.
  • a further separation of residual oil particles can finally be achieved if the second flow path located downstream of the deflection zone opens into the outflow opening of the cylinder head cover via an approximately 90 ° deflection.
  • the cylinder head cover with the flow channel, the intermediate wall, the partition and the drainage channel is made in one piece by casting, wherein at least the flow channel with preferably inflow and outflow as far as possible by a preferably single lost core is formed, which is then removed in a conventional manner by shaking, rinsing, etc.
  • This type of production is also claimed separately.
  • the cylinder head cover is used in an internal combustion engine with each cylinder individual cylinder heads and cylinder head covers, the inflow opening and the outlet opening of the flow channel geodetically above and the drain opening are arranged geodetically down and thus flow-favorable positioning of the flow channel with the corresponding openings Ensure supply and discharge of the blow-by gases and the separated oil particles.
  • a cylinder head cover 1 shown preferably made of a light metal alloy, in which an oil separator 2 of a not shown crankcase ventilation of a reciprocating internal combustion engine is integrated with a plurality of individual cylinder heads and corresponding cylinder head covers.
  • a single cylinder head (with the dotted line 3 in the Fig. 3 indicated) of the internal combustion engine patch, in plan view ( Fig. 1 seen approximately rectangular cylinder head cover 1 has side walls 4, 5, 6, 7 and a bottom wall 8 (FIG. Fig. 2 ) on.
  • the cylinder head cover 1 is provided at its lower, planar connecting surface with molded-on slugs 9, through which they pass with the interposition of a circumferential seal 25 (FIG. Fig. 2 ) and is fastened by means of several screws not shown here on the cylinder head.
  • the oil separation device 2 has a flow channel 10, which is formed below the bottom wall 8 of the cylinder head cover 1, and which extends downwards through an at least partially approximately parallel to the bottom wall 8 aligned intermediate wall 11 and laterally bounded by the adjoining the bottom wall 8 side walls 4, 5, 6, 7.
  • the cylinder head cover 1 aligned partition wall 12 is poured, which extends from the upper side wall 6 starting here in about about 2/3 of the length of the cylinder head cover 1 between the bottom wall 8 and the intermediate wall 11 and, as this particular of the Fig. 1 it can be seen, the flow channel 10 in a first flow path 10a, a deflection zone 10b on the free end face of the partition wall 12 and finally divided into a second flow path 10c.
  • the flow channel 10 is designed such that its flow cross-section upstream of the deflection zone 10b is smaller than the cross section of the deflection zone 10b at least in a partial region and the cross section of the section of the second flow path 10c immediately following the deflection zone 10b.
  • the cross-sectional widening or the associated flow calming in the deflection zone 10b is further supported by the volume of the branching outflow channel 13 (compare also Fig. 3 ), so that the velocity of the flowing in the flow channel 10 blow-by gases in the deflection zone 10b and is significantly reduced.
  • the relaxation of the gas molecules effected in the region of the deflection zone 10b is thus assisted by the fact that the gas velocity upstream of the deflection zone 10b initially increases or the gas is compressed.
  • the partition 12 is oriented obliquely or at an angle to a vertical longitudinal center plane of the cylinder head cover 1, that, as in particular the Fig. 1 shows, the clear cross section of the flow path 10a, starting from an inflow opening 14 tapers to the deflection zone 10b and thus a compression zone V is formed.
  • the inflow opening 14, which is formed here by way of example as a downwardly open inflow opening, is formed by the free interspace between the side wall 6 and the intermediate wall 11 ending at a defined distance from the latter.
  • the second flow path 10c is preferably designed in such a way that its light cross section increasingly tapers starting from the deflection zone 10b, in the exemplary case shown here up to the outflow opening 15 arranged in the side wall 5, which, for example, only indicates a line connection 16 may have.
  • the flow channel 10 ends in a further, approximately 90 ° comprehensive flow deflection 10d at the discharge opening 15th
  • the intermediate wall 11 is, as in particular from Fig. 3 can be seen, with respect to a horizontal obliquely sloping executed such that separated from the blow-by gases exhaust gas particles 13a down and finally flow back through the provided at the lower end of the discharge channel 13 drain port 17 via the cylinder head, not shown, back into the crankcase of the internal combustion engine can.
  • the from the drawing of the Fig. 3 apparent slope or angling of the intermediate wall 11 and the bottom 8 of the cylinder head cover 1 results essentially also from the respective installation position of the cylinder head cover 1, For example, due to the opposite to a horizontal oblique terminal surface 3 of the cylinder head in a V-arrangement.
  • the Fig. 3a shows an enlarged plan view of the drain opening 17, which is formed adjacent to a core bearing opening 25 for a lost core 19 described in more detail below and which Kerntagerö Stamm 25 is closed by means of a Kernlochdeckels 26.
  • a drain valve may be used, which can drain accumulating oil, but reliably prevents a short-circuit flow of blow-by gases.
  • a valve can in particular for larger flow rates of blow-by gases be displayed in the crankcase ventilation of the internal combustion engine.
  • Particularly preferred in this context is an embodiment as shown in the Fig. 3b is shown, in which a drain valve 28 is inserted into the core bearing opening 25 and a drain valve 18 with a defined bias in the core bearing opening 25 holding, elastically resilient spring valve holder 27 by means of a retaining screw 28 in the then formed as a threaded hole opening 17 'is used.
  • drain valve 28 as described above, is designed so that it on the one hand allows a drain of separated oil, but on the other hand prevents a short-circuit flow of blow-by gases.
  • the core bearing opening 25 and the opening 17 'or discharge opening 17 can thus, as in the Fig. 3a and 3b be represented, functionalized different and thus allow a flexible, adapted to the particular circumstances use.
  • cylinder head covers 1 In internal combustion engines having a plurality of individual cylinder heads and a plurality of individual cylinder head covers, for example in a V-6 internal combustion engine, only one or only part of the cylinder head covers 1 may be equipped with an oil separation device 2 per cylinder bank or cylinder bank. Particularly useful in several cylinder banks or rows of cylinders then discharged from the cylinder head covers 1 blow-by gases via lines 16 to a common Feinölabscheider 29 and the further separated oil finally fed back to the crankcase of the engine, while the deoiled gases finally ansaugstory the Combustion of the internal combustion engine are admixed. This is only extremely schematic in the Fig.
  • the cylinder head cover 1 with the ⁇ labscheide noisy 2 is preferably made in one piece of a light metal alloy, for example, an Al alloy or a Mg alloy.
  • a lost core 19 defining the flow channel 10 for a die casting tool, which in addition to the form of the flow channel 10 imaging negative mold 20 and the web-shaped recess 21 for the partition wall 12 and core marks 22 for the positioning of the core 19 in a lower box 23 (FIGS. Fig. 5 ) having.
  • the core 19, for example, made of a sand mixture and solidified, is inserted into the core bearing 24 provided in the lower box 23 by recesses.
  • the sub-box 23, not described further, thus defines, in combination with the core 19, the inner contours of the side walls 4, 5, 6, 7 and the bottom 8, as well as the flow channel 10 as such.
  • the inner and outer contours of the cylinder head cover 1 including the flow channel 10 are defined so that the cylinder head cover 1 can be produced by subsequent introduction of the casting melt in sand casting or chill casting or other suitable casting.
  • the lost core 19 is then removed by not shown, provided core holes by shaking, rinsing, etc., so that the flow channel 10 and the drainage channel 13 are exposed throughout.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Claims (11)

  1. Couvre-culasse pour un moteur à combustion interne présentant de préférence un couvre-culasse par culasse, avec un reniflard de carter de vilebrequin qui présente un dispositif séparateur d'huile qui est réalisé sous le fond du couvre-culasse et qui présente une paroi espacée, approximativement parallèle au fond, qui forme avec le fond un canal d'écoulement, le canal d'écoulement présentant en outre une paroi de séparation approximativement perpendiculaire au fond et à la paroi intermédiaire, qui divise le canal d'écoulement en deux sections d'écoulement de sens opposé et une zone de déviation causant de préférence une déviation d'environ 180°, une ouverture d'afflux, et une ouverture d'évacuation avec en outre une ouverture d'écoulement disposée plus bas du point de vue géodésique, pour l'huile de lubrification séparée des gaz contournant le piston, étant prévues respectivement à l'entrée du canal d'écoulement et à son extrémité, en ce que la section d'écoulement (10a) étant réalisée en amont de la zone de déviation (10b) avec un rétrécissement de section transversale ou une zone de compression (V) augmentant la vitesse d'écoulement, au niveau duquel ou de laquelle se raccorde, en tant que zone de stabilisation et de séparation, la zone de déviation (10b) présentant par comparaison une section transversale d'écoulement plus importante conjointement avec un canal de sortie d'écoulement (13) débouchant du côté de la zone de déviation, qui cause l'augmentation de section transversale ou de volume ou qui y contribue, caractérisé en ce que dans le cas de plusieurs couvre-culasses (1) avec un dispositif de séparation d'huile (2), les ouvertures d'évacuation (15) sont réunies pour former une conduite d'amenée commune (30) au moyen d'une conduite s'y raccordant (16), au moyen de laquelle conduite d'amenée les gaz évacués sont acheminés à un séparateur d'huile fin (29) avant leur recirculation vers le côté d'air propre du moteur à combustion interne.
  2. Couvre-culasse selon la revendication 1, caractérisé en ce que le canal de sortie d'écoulement (13), dans l'état monté du couvre-culasse (1), est réalisé sous forme de canal descendant vers le bas du point de vue géodésique au niveau de la zone de déviation (10b), au niveau du point le plus bas duquel ou au niveau de l'extrémité duquel est prévue l'ouverture d'écoulement (17) pour l'huile de lubrification séparée revenant vers le carter de vilebrequin.
  3. Couvre-culasse selon la revendication 2, caractérisé en ce que le canal de sortie d'écoulement (13) formé par des parois latérales (4, 5) et la paroi intermédiaire (11), vu dans la direction d'écoulement, débouche en outre dans la région en aval de la zone de déviation (10b) dans la section d'écoulement (10c) située en aval de la zone de déviation (10b), en particulier le canal de sortie d'écoulement (13) fait saillie vers le bas approximativement suivant un angle de 90° depuis la zone de déviation (10b) et/ou la section d'écoulement (10c) située en aval de la zone de déviation (10b).
  4. Couvre-culasse selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la paroi de séparation (12), en vue de dessus sur le canal d'écoulement (10), s'étend sous forme coudée ou oblique entre les deux sections d'écoulement de sens opposé (10a, 10c), en particulier s'étend sous forme oblique ou coudée par rapport à un axe médian longitudinal de la région de canal d'écoulement de préférence approximativement rectangulaire, en vue de dessus, de telle sorte que la première section d'écoulement (10a) et éventuellement la deuxième section d'écoulement (10c) aient une section transversale se rétrécissant dans la direction d'écoulement des gaz.
  5. Couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce que l'ouverture d'afflux (14) vers le canal d'écoulement (10) est réalisée avec une section transversale supérieure à celle de l'ouverture d'évacuation (15).
  6. Couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce que la paroi intermédiaire (11) limitant vers le bas le canal d'écoulement (10) descend vers le canal de sortie d'écoulement (13), en particulier descend de manière croissante et/ou en forme d'arc.
  7. Couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce que la deuxième section d'écoulement (10c), située en aval de la zone de déviation (10b), débouche dans l'ouverture d'évacuation (15) par le biais d'une déviation (10d) d'environ 90°.
  8. Couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce que le couvre-culasse (1) est fabriqué d'une seule pièce par un procédé de moulage avec le canal d'écoulement (10), la paroi intermédiaire (11), la paroi de séparation (12) et le canal de sortie d'écoulement (13), au moins le canal d'écoulement (10) étant formé avec un noyau perdu (19).
  9. Couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est utilisé dans un moteur à combustion interne ayant des culasses et des couvre-culasses (1) individuels pour chaque cylindre, l'ouverture d'afflux (14) et l'ouverture d'évacuation (15) du canal d'écoulement (10) étant disposées en haut du point de vue géodésique et l'ouverture d'écoulement (17) étant disposée en bas du point de vue géodésique.
  10. Couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce que pour un moteur à combustion interne avec des cylindres disposés en ligne ou en V, pour chaque rangée de cylindres ou chaque banc de cylindres, seulement une partie des couvre-culasses (1) sont réalisés avec un dispositif de séparation d'huile (2) et les autres couvre-culasses sont réalisés sans dispositif de séparation d'huile (2).
  11. Procédé de moulage pour la fabrication d'un couvre-culasse selon l'une quelconque des revendications précédentes, caractérisé en ce que le couvre-culasse (1) est fabriqué d'une seule pièce avec le canal d'écoulement (10), la paroi intermédiaire (11), la paroi de séparation (12) et le canal de sortie d'écoulement (13) ainsi que les ouvertures d'afflux et d'évacuation (14, 15), au moins le canal d'écoulement (10) étant formé par un noyau perdu unique (19).
EP10012552.5A 2009-12-08 2010-09-30 Couvre culasse pour moteurs à combustion interne Active EP2336509B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910057528 DE102009057528A1 (de) 2009-12-08 2009-12-08 Zylinderkopfhaube für Brennkraftmaschine

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EP2336509A1 EP2336509A1 (fr) 2011-06-22
EP2336509B1 true EP2336509B1 (fr) 2016-06-15

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Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE102015205216A1 (de) * 2015-03-23 2016-05-19 Mtu Friedrichshafen Gmbh Abscheideeinrichtung, Kurbelgehäuse-Entlüftung für eine Brennkraftmaschine und Brennkraftmaschine
CN111237029B (zh) * 2020-03-25 2024-05-03 安徽华菱汽车有限公司 一种曲轴箱通风装置
CN113482745B (zh) * 2021-07-27 2023-05-05 东风商用车有限公司 一种发动机的通风系统及控制方法

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Publication number Priority date Publication date Assignee Title
FR2647506B1 (fr) * 1989-05-25 1994-02-18 Lebranchu Sa Procede de fabrication d'un couvre-culasse a decanteur d'huile, et couvre-culasse obtenu par la mise en oeuvre de ce procede
FR2789125B1 (fr) * 1999-01-29 2001-11-09 Renault Dispositif de reaspiration des gaz de carter d'un moteur
DE10247175A1 (de) 2002-10-10 2004-04-22 Daimlerchrysler Ag Entlüftungsvorrichtung für ein Kurbelgehäuse einer Brennkraftmaschine
JP4169763B2 (ja) * 2006-03-20 2008-10-22 小島プレス工業株式会社 ブローバイガス用オイルセパレータ
JP2009013941A (ja) * 2007-07-09 2009-01-22 Honda Motor Co Ltd エンジンのブリーザ装置

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EP2336509A1 (fr) 2011-06-22

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