EP0299986B1 - Lubricant oil duct - Google Patents

Lubricant oil duct Download PDF

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Publication number
EP0299986B1
EP0299986B1 EP87907575A EP87907575A EP0299986B1 EP 0299986 B1 EP0299986 B1 EP 0299986B1 EP 87907575 A EP87907575 A EP 87907575A EP 87907575 A EP87907575 A EP 87907575A EP 0299986 B1 EP0299986 B1 EP 0299986B1
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EP
European Patent Office
Prior art keywords
lubricating oil
spray nozzle
crankcase
lubricant oil
nozzle holders
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Expired - Lifetime
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EP87907575A
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German (de)
French (fr)
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EP0299986A1 (en
Inventor
Hansjörg HEBERLE
Werner Leicht
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Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
MTU Motoren und Turbinen Union Friedrichshafen GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means

Definitions

  • the invention relates to a lubricating oil channel according to the preamble of claim 1, as is known for example from DE-PS 968 013.
  • DE-PS 968 013 shows an internal combustion engine whose pistons are cooled by spraying with lubricating oil using spray nozzles.
  • the lubricating oil is supplied to the spray nozzles via a lubricating oil channel which passes near the open ends of the cylinder liners which protrude into the crankcase.
  • the spray nozzles are placed on the outer circumference of the tubular lubricating oil channel with the interposition of fitting pieces serving as holders.
  • the lubricating oil duct has circumferential bores so that lubricating oil reaches the nozzle, which connect to passages in the holders.
  • a longitudinal bore obviously serves as a lubricating oil channel in a casting which extends in the longitudinal direction of the engine and which should be cast on the crankcase.
  • the lubricant line is composed of pipe sections and T-shaped connecting pieces.
  • the lubricating oil is not directed to the pistons of the internal combustion engine by means of spray nozzles, but rather via a tight line connection using trombone tubes. An output of each T-shaped connector is therefore connected to a trombone tube. It is not shown how the lubricant line of such composition is guided and fastened in the crankcase. However, since no brackets are shown on the connecting pieces, it can be assumed that the pipe pieces lying between the connecting pieces are held in some way.
  • the invention has for its object to show the design and arrangement of a lubricating oil duct, which can be represented and varied in a simple and cost-effective manner, can be installed in a space-saving manner in the crankcase, is easily accessible and can be dismantled together with spray nozzles, and in particular it can also be ensured that impurities of the lubricating oil duct due to chips or other processing residues.
  • the special design of the spray nozzle holder namely that they can be attached to the transverse walls of the crankcase, that they have passages that connect to the through holes in the transverse walls, and that they also serve to hold the plug-in pipes that complete the lubricating oil channel, enables simple and inexpensive construction of a lubricating oil line in the crankcase.
  • the lubricating oil duct enables the lubricating oil line to be laid anywhere in the crankcase to save space.
  • the lubricant line can be adapted to all special conditions in various crankcase structures, in particular with only minor component changes.
  • the lubricating oil channel is laid just below a boundary wall of a crankcase in order to achieve the lowest possible overall height of the internal combustion engine.
  • the through holes in the transverse walls should be as far as possible from the highly stressed critical transition area between the transverse wall and the upper boundary wall of the crankcase - and for reasons of accessibility, the through holes must be deeper than the other sections of the lubricating oil line with regard to the connecting rod violin and the most space-saving design.
  • the design of the lubricating oil channel allows an adaptation to the spatial conditions in a simple manner, namely by arranging the through hole and plug-in tubes in an offset manner.
  • the offset is produced by a suitably running, molded passage in the spray nozzle holder.
  • the crank chamber of which is shown in a fragmentary cross-sectional view the cylinders are arranged in a V-shape.
  • the area of the crank chamber in which the lower end of a cylinder liner 1 is arranged is shown.
  • the cylinder liner 1 is assigned a spray nozzle 2 with spray nozzle holder 3, the latter being fastened to a transverse wall 4 of the crankcase 5.
  • the transverse wall 4 is connected to an upper boundary wall 13 of the crankcase 5.
  • Crankshaft bearings, not shown, are arranged in the transverse walls 4.
  • the spray nozzle holders 3 are located above the crankshaft bearings in the center line of the internal combustion engine.
  • the lubricating oil channel 12 is thus centrally between the two rows of cylinders of the internal combustion engine.
  • FIG. 2 The attachment of two spray nozzle holders 3 located opposite one another on different sides of a transverse wall 4 is shown in FIG. 2.
  • the spray nozzle holders 3 are arranged rotated by 180 ° relative to one another.
  • the two fastening screws 8 are screwed into the thread in the respective opposite spray nozzle holder 3 from different sides. Since there is a through hole and a blind hole in each spray nozzle holder, the advantage is also achieved that incorrect installation is excluded.
  • the fastening screws 8 are also so long that an additional screw lock can be dispensed with due to sufficient elastic pretension.
  • Passages 7 are formed in the spray nozzle holder 3 and connect to through bores 9 in the transverse walls 4.
  • Plug-in tubes 10 are inserted into the passages 7 of the spray nozzle holder 3 and complete the lubricating oil channel 12.
  • Sealing rings 11, which lie between the plug-in tube 10 and the passage 7, serve for sealing.
  • FIG. 3 which shows a fragmentary longitudinal section of the crankcase in the area between two transverse walls 4, shows a section of a lubricating oil channel 12 composed of plug-in tubes 10, spray nozzle holder 3 and through bores 9. It is clear that the plug-in tubes 10 are held completely on the spray nozzle holders 3.
  • a lubricating oil duct section composed of a plug-in tube 10 and two spray nozzle holders 3 is placed in the crankcase 5 and the fastening screws 8 are screwed in.
  • parts of the oil duct including spray nozzles or the entire oil duct can also be removed and replaced.
  • the outline of the connecting rod violin is shown in broken lines.
  • the arrangement of the lubricating oil channel just below the upper boundary wall 13 allows a compact construction of the engine, in which there is only a narrow space between the upper boundary wall 13 of the crankcase 5 and the engine parts rotating with the crankshaft.
  • the through holes in the transverse walls cannot be too close to the critical transition area between the transverse wall and the upper boundary wall of the crankcase. Due to the design of the lubricating oil channel, the through bores in the transverse walls can be made deeper than the plug-in tubes 10.
  • a corresponding shaping of the passages in the spray nozzle holders 3 following the through bores in transverse walls is then necessary.
  • the passages are shaped so that there is an offset.
  • the passages then run obliquely to the upper boundary wall. In this way, the lubricating oil duct can be constructed in the most space-saving manner without having to accept other disadvantages.

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

Abstract

A lubricant oil duct (12) for conveying lubricant oil to spray nozzles (2) for cooling the pistons of an internal combustion engine. The spray nozzles (2) are linked to holders (3) fixed to transverse walls (4) in the crankcase (5). Passages (7) formed in the spray nozzle holders (3) open into through-holes (9) in the transverse walls (4). Plug-in pipes (10) arranged between the passages (7) of mutually opposite spray nozzle holders (3) fixed to different transverse walls (4) complete the lubricant oil ducts. A simple and economic lubricant oil duct is thus obtained. The fact that the components of the lubricant oil duct are finished before being assembled is particularly advantageous, since impurities due to finishing residues can be eliminated before assembly. The lubricant oil duct occupies a small space in the crankcase (5) and can be dismounted for maintenance purposes.

Description

Die Erfindung betrifft einen Schmierölkanal nach dem Oberbegriff des Anspruchs 1, wie er beispielsweise aus der DE-PS 968 013 als bekannt hervorgeht.The invention relates to a lubricating oil channel according to the preamble of claim 1, as is known for example from DE-PS 968 013.

In der DE-PS 968 013 ist eine Brennkraftmaschine dargestellt, deren Kolben durch Anspritzen mit Schmieröl mittels Spritzdüsen gekühlt werden. Die Zufuhr des Schmieröls zu den Spritzdüsen erfolgt über einen Schmierölkanal, der in der Nähe der in das Kurbelgehäuse hineinragenden offenen Enden der Zylinderlaufbüchsen vorbeiführt. Die Spritzdüsen sind unter Zwischenschaltung von als Halter dienenden Paßstücken auf den Außenumfang des rohrförmig ausgebildeten Schmierölkanals aufgesetzt. Damit Schmieröl zur Düse gelangt, besitzt der Schmierölkanal Umfangsbohrungen, die an Durchgänge in den Haltern anschließen. Als Schmierölkanal dient offensichtlich eine Längsbohrung in einem sich in Motorlängsrichtung erstreckenden Gußstück, das am Kurbelgehäuse angegossen sein dürfte. Die Befestigung der Spritzdüsen am Schmierölkanal erfolgt offenbar mittels jeweils einer Schraube, die von unten her einen Spritzdüsenhalter erfaßt und in ein Gewinde in der Wandung des Schmierölkanals eingedreht wird. Dies macht es erforderlich, die Wandstärke des Schmierölkanals so groß zu halten, daß eine ausreichende Tiefe des Gewindes für ausreichenden Halt der Befestigungsschrauben gegeben ist. Bei eingegossenem Schmierölkanal werden im Kurbelgehäuseraum spanende Bearbeitungsvorgänge erforderlich.DE-PS 968 013 shows an internal combustion engine whose pistons are cooled by spraying with lubricating oil using spray nozzles. The lubricating oil is supplied to the spray nozzles via a lubricating oil channel which passes near the open ends of the cylinder liners which protrude into the crankcase. The spray nozzles are placed on the outer circumference of the tubular lubricating oil channel with the interposition of fitting pieces serving as holders. The lubricating oil duct has circumferential bores so that lubricating oil reaches the nozzle, which connect to passages in the holders. A longitudinal bore obviously serves as a lubricating oil channel in a casting which extends in the longitudinal direction of the engine and which should be cast on the crankcase. The attachment of the spray nozzles to the lubricating oil duct is evidently carried out by means of a screw which engages a spray nozzle holder from below and is screwed into a thread in the wall of the lubricating oil duct. This makes it necessary to keep the wall thickness of the lubricating oil channel so large that there is a sufficient depth of the thread for sufficient retention of the fastening screws. When the lubricating oil channel is cast in, machining operations are required in the crankcase space.

Wegen im Kurbelraum schwierig durchzuführender Kontrollmaßnahmen ist es nicht auszuschließen, daß im Schmierölkanal oder anderswo im Kurbelraum Bearbeitungsrückstände wie Späne verbleiben.Because control measures are difficult to carry out in the crankcase, it cannot be ruled out that processing residues such as chips remain in the lubricating oil duct or elsewhere in the crankcase.

Nach der DE-PS 844 990 ist die Schmiermittelleitung aus Rohrstücken und T-förmigen Verbindungsstücken zusammengesetzt. Zu den Kolben der Brennkraftmaschine wird das Schmieröl nicht mittels Spritzdüsen geleitet, sondern über eine dichte Leitungsverbindung mittels Posaunenrohren. Ein Ausgang jedes T-förmigen Verbindungsstücks steht deshalb mit einem Posaunenrohr in Verbindung. Nicht dargestellt ist, wie die dermaßen zusammengesetzte Schmiermittelleitung im Kurbelgehäuse geführt und befestigt ist. Da an den Verbindungsstücken jedoch keine Halterungen dargestellt sind, ist davon auszugehen, daß die zwischen den Verbindungsstücken liegenden Rohrstücke in irgend einer Weise gehaltert sind.According to DE-PS 844 990, the lubricant line is composed of pipe sections and T-shaped connecting pieces. The lubricating oil is not directed to the pistons of the internal combustion engine by means of spray nozzles, but rather via a tight line connection using trombone tubes. An output of each T-shaped connector is therefore connected to a trombone tube. It is not shown how the lubricant line of such composition is guided and fastened in the crankcase. However, since no brackets are shown on the connecting pieces, it can be assumed that the pipe pieces lying between the connecting pieces are held in some way.

Der Erfindung liegt die Aufgabe zugrunde, Ausbildung und Anordnung eines Schmierölkanals aufzuzeigen, der in einfacher und kostengünstiger Weise darstellbar und variierbar ist, raumsparend im Kurbelgehäuse verlegbar ist, gut zugänglich und samt Spritzdüsen auch wieder ausbaubar ist, und wobei auch insbesondere gewährleistbar ist, daß Verunreinigungen des Schmierölkanals durch Späne oder andere Bearbeitungsrückstände ausgeschlossen sind.The invention has for its object to show the design and arrangement of a lubricating oil duct, which can be represented and varied in a simple and cost-effective manner, can be installed in a space-saving manner in the crankcase, is easily accessible and can be dismantled together with spray nozzles, and in particular it can also be ensured that impurities of the lubricating oil duct due to chips or other processing residues.

Diese Aufgabe wird bei einer gattungsgemäßen Einrichtung durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved in a generic device by the characterizing features of claim 1.

Die besondere Ausbildung der Spritzdüsenhalter, daß sie nämlich an die Querwände des Kurbelgehäuses anbaubar sind, daß sie Durchgänge besitzen, die an die Durchgangsbohrungen in den Querwänden anschließen, und daß sie zugleich zur Halterung der Steckrohre dienen, die den Schmierölkanal vervollständigen, ermöglicht den einfachen und kostengünstigen Aufbau einer Schmierölleitung im Kurbelraum.The special design of the spray nozzle holder, namely that they can be attached to the transverse walls of the crankcase, that they have passages that connect to the through holes in the transverse walls, and that they also serve to hold the plug-in pipes that complete the lubricating oil channel, enables simple and inexpensive construction of a lubricating oil line in the crankcase.

Da die einzelnen Bauteile des Schmierölkanals vor dem Einbau fertig bearbeitet sind und außerhalb des Kurbelraums auf Bearbeitungsrückstände kontrollierbar sind, ist eine Verunreinigung des Schmierölkanals ausgeschlossen. Das Bauprinzip des Schmierölkanals ermöglicht es, die Schmierölleitung raumsparend an beliebiger Stelle im Kurbelgehäuse zu verlegen. Für eine raumsparende Anordnung kann insbesondere mit nur geringfügigen Bauteiländerungen die Schmiermittelleitung allen besonderen Gegebenheiten in verschiedenen Kurbelgehäusestrukturen angepaßt werden. So wird in einer besonderen Ausgestaltung bei einer Brennkraftmaschine mit V-förmig angeordneten Zylindern der Schmierölkanal knapp unterhalb einer Begrenzungswand eines Kurbelgehäuses verlegt, um eine möglichst geringe Bauhöhe der Brennkraftmaschine zu erzielen. Aus Festigkeitsgründen - die Durchgangsbohrungen in den Querwänden sollen möglichstweitab vom hochbelasteten kritischen Übergangsbereich zwischen Querwand und oberer Begrenzungswand des Kurbelgehäuses liegen - und aus Gründen der Zugänglichkeit müssen die Durchgangsbohrungen tiefer liegen, als die anderen Abschnitte der Schmierölleitung mit Rücksicht auf Pleuelgeige und raumsparendste Bauweise liegen können. Die Bauweise des Schmierölkanals erlaubt eine Anpassung an die räumlichen Gegebenheiten in einfacher Weise, indem nämlich Durchgangsbohrung und Steckrohre versetzt angeordnet werden. Der Versatz wird durch einen geeignet verlaufenden, eingeformten Durchgang im Spritzdüsenhalter hergestellt.Since the individual components of the lubricating oil channel are finished before installation and outside of the crank chamber for processing residues can be checked, contamination of the lubricating oil channel is excluded. The construction principle of the lubricating oil duct enables the lubricating oil line to be laid anywhere in the crankcase to save space. For a space-saving arrangement, the lubricant line can be adapted to all special conditions in various crankcase structures, in particular with only minor component changes. For example, in a special embodiment of an internal combustion engine with V-shaped cylinders, the lubricating oil channel is laid just below a boundary wall of a crankcase in order to achieve the lowest possible overall height of the internal combustion engine. For reasons of strength - the through holes in the transverse walls should be as far as possible from the highly stressed critical transition area between the transverse wall and the upper boundary wall of the crankcase - and for reasons of accessibility, the through holes must be deeper than the other sections of the lubricating oil line with regard to the connecting rod violin and the most space-saving design. The design of the lubricating oil channel allows an adaptation to the spatial conditions in a simple manner, namely by arranging the through hole and plug-in tubes in an offset manner. The offset is produced by a suitably running, molded passage in the spray nozzle holder.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher beschrieben; es zeigen:

  • Fig. 1 eine fragmentarische Querschnittsansicht des Kurbelraums einer Brennkraftmaschine im Bereich einer Spritzdüse mit Blick auf eine Querwand des Kurbelgehäuses,
  • Fig. 2 einen Schnitt durch eine Querwand des Kurbelgehäuses im Bereich der Durchgangslöcher und die Befestigung der Spritzdüsenhalter,
  • Fig. 3 den Verlauf eines Abschnitts eines Schmierölkanals im Bereich zwischen zwei Querwänden des Kurbelgehäuses.
An embodiment of the invention is shown in the drawings and will be described in more detail below; show it:
  • 1 is a fragmentary cross-sectional view of the crankcase of an internal combustion engine in the area of a spray nozzle with a view of a transverse wall of the crankcase,
  • 2 shows a section through a transverse wall of the crankcase in the area of the through holes and the attachment of the spray nozzle holder,
  • Fig. 3 shows the course of a section of a lubricating oil channel in the area between two transverse walls of the crankcase.

Bei der Brennkraftmaschine, deren Kurbelraum in einer fragmentarischen Querschnittsansicht dargestellt ist, sind die Zylinder V-förmig angeordnet. Es ist der Bereich des Kurbelraums dargestellt, in dem das untere Ende einer Zylinderbüchse 1 angeordnet ist. Der Zylinderbüchse 1 ist eine Spritzdüse 2 mit Spritzdüsenhalter 3 zugeordnet, wobei letzterer auf einer Querwand 4 des Kurbelgehäuses 5 befestigt ist. Die Querwand 4 ist mit einer oberen Begrenzungswand 13 des Kurbelgehäuses 5 verbunden. In den Querwänden 4 sind nicht dargestellte Kurbelwellenlager angeordnet. Die Spritzdüsenhalter 3 liegen oberhalb der Kurbelwellenlager in der Mittellinie der Brennkraftmaschine. Der Schmierölkanal 12 liegt somit zentral zwischen den zwei Zylinderreihen der Brennkraftmaschine.In the internal combustion engine, the crank chamber of which is shown in a fragmentary cross-sectional view, the cylinders are arranged in a V-shape. The area of the crank chamber in which the lower end of a cylinder liner 1 is arranged is shown. The cylinder liner 1 is assigned a spray nozzle 2 with spray nozzle holder 3, the latter being fastened to a transverse wall 4 of the crankcase 5. The transverse wall 4 is connected to an upper boundary wall 13 of the crankcase 5. Crankshaft bearings, not shown, are arranged in the transverse walls 4. The spray nozzle holders 3 are located above the crankshaft bearings in the center line of the internal combustion engine. The lubricating oil channel 12 is thus centrally between the two rows of cylinders of the internal combustion engine.

Die Befestigung zweier einander auf verschiedenen Seiten einer Querwand 4 gegenüberliegender Spritzdüsenhalter 3 ist in Fig. 2 dargestellt. Um zu vermeiden, daß in die Querwand 4 Gewinde eingeschnitten werden müssen, was insbesondere bei Aluminium-Kurbelgehäusen ungünstig ist, sind die Spritzdüsenhalter 3 um 180° gegeneinander verdreht angeordnet. Die zwei Befestigungsschrauben 8 werden jeweils von verschiedenen Seiten ins Gewinde im jeweilig gegenüberliegenden Spritzdüsenhalter 3 eingedreht. Da in jedem Spritzdüsenhalter ein Durchgangsloch und ein Sackloch bestehen, wird auch der Vorteil erzielt, daß eine Falschmontage ausgeschlossen ist. Die Befestigungsschrauben 8 sind ferner so lang, daß aufgrund ausreichender elastischer Vorspannung auf eine zusätzliche Schraubensicherung verzichtet werden kann. In die Spritzdüsenhalter 3 sind Durchgänge 7 eingeformt, die an Durchgangsbohrungen 9 in den Querwänden 4 anschließen. In die Durchgänge 7 der Spritzdüsenhalter 3 sind Steckrohre 10 eingesetzt, die den Schmierölkanal 12 vervollständigen. Zur Abdichtung dienen Dichtringe 11, die zwischen Steckrohr 10 und Durchgang 7 liegen.The attachment of two spray nozzle holders 3 located opposite one another on different sides of a transverse wall 4 is shown in FIG. 2. In order to avoid that 4 threads have to be cut into the transverse wall, which is particularly disadvantageous in the case of aluminum crankcases, the spray nozzle holders 3 are arranged rotated by 180 ° relative to one another. The two fastening screws 8 are screwed into the thread in the respective opposite spray nozzle holder 3 from different sides. Since there is a through hole and a blind hole in each spray nozzle holder, the advantage is also achieved that incorrect installation is excluded. The fastening screws 8 are also so long that an additional screw lock can be dispensed with due to sufficient elastic pretension. Passages 7 are formed in the spray nozzle holder 3 and connect to through bores 9 in the transverse walls 4. Plug-in tubes 10 are inserted into the passages 7 of the spray nozzle holder 3 and complete the lubricating oil channel 12. Sealing rings 11, which lie between the plug-in tube 10 and the passage 7, serve for sealing.

In Fig. 3, die einen fragmentarischen Längsschnitt des Kurbelgehäuses im Bereich zwischen zwei Querwänden 4 zeigt, ist ein Abschnitt eines aus Steckrohren 10, Spritzdüsenhalter 3 und Durchgangsbohrungen 9 zusammengesetzten Schmierölkanals 12 gezeigt. Es wird deutlich, daß die Steckrohre 10 vollständig an den Spritzdüsenhaltern 3 gehaltert sind. Zum Einbau zwischen den zwei Querwänden 4 wird ein aus Steckrohr 10 und zwei Spritzdüsenhalter 3 zusammengesetzter Schmierölkanal-Abschnitt im Kurbelgehäuse 5 plaziert und die Befestigungsschrauben 8 eingedreht. In ebenso einfacher Weise können beispielsweise bei verschmutzten Spritzdüsen Teile des Ölkanals samt Spritzdüsen oder der gesamte Ölkanal auch wieder ausgebaut und ausgewechselt werden.FIG. 3, which shows a fragmentary longitudinal section of the crankcase in the area between two transverse walls 4, shows a section of a lubricating oil channel 12 composed of plug-in tubes 10, spray nozzle holder 3 and through bores 9. It is clear that the plug-in tubes 10 are held completely on the spray nozzle holders 3. For installation between the two transverse walls 4, a lubricating oil duct section composed of a plug-in tube 10 and two spray nozzle holders 3 is placed in the crankcase 5 and the fastening screws 8 are screwed in. In the same simple way, for example in the case of dirty spray nozzles, parts of the oil duct including spray nozzles or the entire oil duct can also be removed and replaced.

Zwischen den Querwänden 4, die auch Bohrungen enthalten, über die Schmieröl zu den Kurbelwellenlagern gelangt, ist strichpunktiert der Umriß der Pleuelgeige dargestellt. Die Anordnung des Schmierölkanals knapp unterhalb der oberen Begrenzungswand 13 erlaubt eine kompakte Bauweise des Motors, bei der nur ein schmaler Raum zwischen oberer Begrenzungswand 13 des Kurbelgehäuses 5 und den mit der Kurbelwelle umlaufenden Triebwerksteilen besteht. Aus Festigkeitsgründen und Gründen der Zugänglichkeit können die Durchgangsbohrungen in den Querwänden nicht zu knapp am kritischen Übergangsbereich zwischen Querwand und oberer Begrenzungswand des Kurbelgehäuses liegen. Aufgrund der Bauweise des Schmierölkanals lassen sich die Durchgangsbohrungen in den Querwänden tiefer legen als die Steckrohre 10. Es ist dann eine entsprechende Formgebung der an die Durchgangsbohrungen in Querwänden anschließenden Durchgänge in den Spritzdüsenhaltern 3 notwendig. Die Durchgänge sind so geformt, daß sich ein Versatz ergibt. Die Durchgänge verlaufen dann schräg zur oberen Begrenzungswand hin. Auf diese Weise läßt sich der Schmierölkanal in raumsparendster Bauweise ausbilden, ohne daß anderweitige Nachteile hingenommen werden müssen.Between the transverse walls 4, which also contain bores, via which lubricating oil reaches the crankshaft bearings, the outline of the connecting rod violin is shown in broken lines. The arrangement of the lubricating oil channel just below the upper boundary wall 13 allows a compact construction of the engine, in which there is only a narrow space between the upper boundary wall 13 of the crankcase 5 and the engine parts rotating with the crankshaft. For reasons of strength and accessibility, the through holes in the transverse walls cannot be too close to the critical transition area between the transverse wall and the upper boundary wall of the crankcase. Due to the design of the lubricating oil channel, the through bores in the transverse walls can be made deeper than the plug-in tubes 10. A corresponding shaping of the passages in the spray nozzle holders 3 following the through bores in transverse walls is then necessary. The passages are shaped so that there is an offset. The passages then run obliquely to the upper boundary wall. In this way, the lubricating oil duct can be constructed in the most space-saving manner without having to accept other disadvantages.

Claims (3)

1. A lubricating oil channel for feeding lubricating oil to spray nozzles which serve to cool the pistons of an internal-combustion engine, wherein the spray nozzles are connected with spray nozzle holders which are securely mounted in the crankcase, and wherein in each of the spray nozzle holders there is provided a passage for the throughflow of lubricating oil from the lubricating oil channel to the spray nozzle, characterised in that the spray nozzle holders (3) are secured to transverse walls (4) of the crankcase (5) for the crankshaft mounting, and the spray nozzle holders (3) incorporate tubular passages (7) which adjoin through-bores (9) of the transverse walls (4), and in that the passages (7) of two spray nozzle holders (3), mounted on different transverse walls and disposed mutually opposite each other, are connected by plug-in pipes (10).
2. A lubricating oil channel according to Claim 1, characterised in that spray nozzle holders (3) respectively situated on different sides of the same transverse wall (4) are screw-mounted by means of common fastening screws (8) passing through the transverse wall (4).
3. A lubricating oil channel according to Claim 1 or 2, characterised in that the through-bores (9) in the transverse wall (4) are arranged offset with respect to the plug-in pipes (10) and a transition following the offset is incorporated in the passages (7) of the spray nozzle holders (3).
EP87907575A 1987-02-03 1987-11-20 Lubricant oil duct Expired - Lifetime EP0299986B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3703047A DE3703047C1 (en) 1987-02-03 1987-02-03 Lube oil channel
DE3703047 1987-02-03

Publications (2)

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EP0299986A1 EP0299986A1 (en) 1989-01-25
EP0299986B1 true EP0299986B1 (en) 1990-07-11

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EP87907575A Expired - Lifetime EP0299986B1 (en) 1987-02-03 1987-11-20 Lubricant oil duct

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US (1) US4869211A (en)
EP (1) EP0299986B1 (en)
DE (2) DE3703047C1 (en)
WO (1) WO1988005860A1 (en)

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Also Published As

Publication number Publication date
DE3703047C1 (en) 1988-06-23
DE3763669D1 (en) 1990-08-16
EP0299986A1 (en) 1989-01-25
WO1988005860A1 (en) 1988-08-11
US4869211A (en) 1989-09-26

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