EP0150542A2 - Assembled liquid-cooled piston for internal combustion engines - Google Patents

Assembled liquid-cooled piston for internal combustion engines Download PDF

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Publication number
EP0150542A2
EP0150542A2 EP84201953A EP84201953A EP0150542A2 EP 0150542 A2 EP0150542 A2 EP 0150542A2 EP 84201953 A EP84201953 A EP 84201953A EP 84201953 A EP84201953 A EP 84201953A EP 0150542 A2 EP0150542 A2 EP 0150542A2
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EP
European Patent Office
Prior art keywords
piston
cooling
cooling channel
tongue
combustion chamber
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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
EP84201953A
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German (de)
French (fr)
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EP0150542A3 (en
Inventor
Horst Dr. Moebus
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Kolbenschmidt AG
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Kolbenschmidt AG
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Publication date
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Publication of EP0150542A2 publication Critical patent/EP0150542A2/en
Publication of EP0150542A3 publication Critical patent/EP0150542A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to a built, liquid-cooled piston for internal combustion engines, in particular diesel engines, the lower part, preferably formed from an aluminum piston alloy, with the upper part, preferably made of iron material, clamped by means of screws and in the case of an annular web running concentrically on the inside of the upper part and a surface of the lower part opposite this, an annular flange provided with a tongue protruding into the outer cooling channel is clamped, the annular web being open both to the radially inner boundary of the connection plane of the two piston components, which is located in the upper part in the area behind the top land and at least part of the ring section Cooling channel forms, as well as a central, connected to the cooling channel via radially arranged coolant bores, open to the connecting plane of the two piston components, internal cooling space and carrying the threaded bores for the screws, and that the cooling channel and cooling space are connected to the coolant circulation system.
  • Such a piston type known from DE-OS 27 23 619 is particularly suitable for use in internal combustion engines machines, preferably medium-speed diesel engines, with the highest engine output and / or heavy oil operation.
  • the cooling takes place by forced or injection cooling, the cooling oil flow being able to take place radially from the outside inwards or vice versa.
  • the design of this piston construction is based on the knowledge that, in the case of built pistons with forced or injection cooling with shaker chambers in a standard design, the highest temperature of the piston crown of over 350 to 400 ° C on the outer oblique edge of the combustion chamber bowl due to the shape of the combustion chamber bowl - due to the design the jet of fuel injected - occurs.
  • Temperatures of 240 to 270 ° C can occur in the area of the inner wall of the outer cooling channel wetted by the cooling oil, which are noticeable by yellow to blue tarnishing on the steel surface of the upper piston part and are already close to or above the flash point of commercially available cooling oils for diesel engines.
  • Experience with such pistons in operation confirms the assumption that the cooling oil cokes very quickly in the area of the outer cooling duct and forms an insulating oil carbon layer, which reduces the cooling effect in such a way that the temperatures of the combustion chamber wall of the cooling duct are substantially increased and so that the strength values of the piston material decrease, the creep resistance is reduced and the thermal deformation is increased. As observed several times, this can lead to permanent deformations.
  • the tongue of the oil guide ring forms a comparatively narrow annular gap with the wall of the cooling channel on the combustion chamber side.
  • the quantity of cooling oil reduced by the throttling leads to a reduced shaker effect and cooling in the area of the ring field, in particular the first piston ring groove, and to an increase in the temperature in this area as a result of heat conduction from the top land downwards, as a result of which a temperature in the piston ring groove from 140 to 160 ° C is achieved.
  • Such temperatures prevent the wet corrosion of the piston and the piston rings even during partial load operation or idling.
  • the tongue can be curved outwards so that its inner side surface forms a comparatively long annular gap with the wall of the cooling channel on the combustion chamber side, as a result of which the absorption of the amount of heat incident is further increased.
  • the tongue can consist of a thermobimetal or with a regulating device of the same type, e.g. a thermostat, so that, depending on the amount of heat to be dissipated, the height of the annular gap between the tongue and the combustion chamber wall of the cooling channel can automatically increase or decrease in order to keep the optimum piston temperature constant regardless of the load in the way a thermostat works.
  • a thermostat works.
  • the piston designed according to the invention is shown as an example in the drawing and explained below.
  • the piston shown in detail in Fig. 1 consists of a eutectic aluminum-silicon alloy or spheroidal graphite cast iron piston lower part 1 and the piston upper part 2 made of steel, which are interconnected via tie rods, not shown.
  • annular flange 9 is clamped between the annular web 4 and the opposite contact surface of the lower piston part 1, on the edge of the cooling channel side of which a tongue 10 protruding into the cooling channel 7, the inner side surface of which forms a comparatively narrow annular gap 11 with the wall of the cooling channel 7 on the combustion chamber side.
  • the cooling oil flows in the cooling chamber 8 and from there via the radial in the annular rib 4 attached to openings 13 into the cooling channel 7.
  • the arrangement of the tongue 10 enters the cooling oil through between the side face of the tongue and the combustion chamber side wall of the cooling channel formed annular gap 11 in the outer part of the cooling channel 7 and flows from there through the drain opening 14.
  • the cooling oil flows via the feed line 15 and the ring flange 17 projecting into the cooling channel 7 into the inner part of the cooling channel 7.
  • the outwardly curved tongue 18 protruding into the cooling channel 7 forms with the inner side surface the combustion chamber-side wall of the cooling channel has an annular gap 19. After emerging from the annular gap 19, the cooling oil flows from the cooling channel 7 via the openings 20 made radially in the annular flange 17 into the cooling chamber 8 and from there via the outlet 21 into the crank chamber.

Abstract

Bei einem gebauten mit einem inneren Kühlraum und einem äußeren Kühlkanal ausgestatteten Kolben für Brennkraftmaschinen ist zwischen einem auf der Innenseite des Oberteils angebrachten Ringsteg und einer diesem gegenüberliegenden Fläche des Unterteils ein Ringflansch eingeklemmt, an dessen kühlkanalseitigem Rand eine in den Kühlkanal hineinragende Zunge angeordnet ist. Um die Temperatur der brennraumseitigen Wand des Kühlkanals soweit wie möglich zu senken und gleichzeitig die Temperatur im Bereich wenigstens der ersten Kolbenringnut auf einem die Naßkorrosion des Kolbens und des Kolbenringes verhindernden Niveau zu halten, bildet die Zunge mit der brennraumseitigen Wand des Kühlkanals einen vergleichsweise engen Ringspalt, der beim Hindurchströmen des Kühlöls einen Drosseleffekt ausübt.In the case of a built-in piston for internal combustion engines equipped with an inner cooling space and an outer cooling duct, an annular flange is clamped between an annular web attached to the inside of the upper part and an opposite surface of the lower part, on the edge of which is arranged in the cooling duct a tongue projecting into the cooling duct. In order to lower the temperature of the wall of the cooling channel on the combustion chamber as much as possible and at the same time to keep the temperature in the area of at least the first piston ring groove at a level which prevents wet corrosion of the piston and the piston ring, the tongue forms a comparatively narrow annular gap with the wall of the cooling channel on the combustion chamber side which has a throttling effect when the cooling oil flows through.

Description

Die Erfindung betrifft einen gebauten, flüssigkeitsgekühlten Kolben für Brennkraftmaschinen, insbesondere Dieselmotoren, dessen Unterteil, vorzugsweise aus einer Aluminium-Kolbenlegierung gebildet, mit dem Oberteil, vorzugsweise aus Eisenwerkstoff bestehend, über Schrauben verspannt und bei dem zwischen einem auf der Innenseite des Oberteils konzentrisch verlaufenden Ringsteg und einer diesem gegenüberliegenden Fläche des Unterteils ein mit einer in den äußeren Kühlkanal ragenden Zunge versehener Ringflansch eingeklemmt ist, wobei der Ringsteg sowohl die radial innere Begrenzung des im Oberteil im Bereich hinter dem Feuersteg und wenigstens einem Teil der Ringpartie befindlichen zur Verbindungsebene der beiden Kolbenbauteile offenen Kühlkanal bildet, als auch einen zentralen, mit dem Kühlkanal über radial angeordnete Kühlmittelbohrungen verbundenen, zur Verbindungsebene der beiden Kolbenbauteile offenen inneren Kühlraum einschließt und die Gewindebohrungen für die Schrauben trägt, und daß Kühlkanal und Kühlraum mit dem Kühlmittelumlaufsystem verbunden sind.The invention relates to a built, liquid-cooled piston for internal combustion engines, in particular diesel engines, the lower part, preferably formed from an aluminum piston alloy, with the upper part, preferably made of iron material, clamped by means of screws and in the case of an annular web running concentrically on the inside of the upper part and a surface of the lower part opposite this, an annular flange provided with a tongue protruding into the outer cooling channel is clamped, the annular web being open both to the radially inner boundary of the connection plane of the two piston components, which is located in the upper part in the area behind the top land and at least part of the ring section Cooling channel forms, as well as a central, connected to the cooling channel via radially arranged coolant bores, open to the connecting plane of the two piston components, internal cooling space and carrying the threaded bores for the screws, and that the cooling channel and cooling space are connected to the coolant circulation system.

Ein solcher aus der DE-OS 27 23 619 bekannter Kolbentyp eignet sich ganz besonders für den Einsatz in Brennkraftmaschinen, vorzugsweise mittelschnellaufenden Dieselmotoren, mit höchster Motorleistung und/oder Schwerölbetrieb. Die Kühlung erfolt durch Zwangs- oder Einspritzkühlung, wobei der Kühlöldurchfluß radial von außen nach innen oder umgekehrt erfolgen kann. Die Gestaltung dieser Kolbenkonstruktion beruht auf der Erkenntnis, daß bei gebauten Kolben mit Zwangs- oder Einspritzkühlung mit Shakerräumen in Standardkonstruktion infolge der Form der Brennraummulde die höchste Temperatur des Kolbenbodens von über 350 bis 400 °C am äußeren schrägen Rand der Brennraummulde - bedingt durch die Ausbildung der Düsenstrahlen des eingespritzten Brennstoffs - auftritt. In dem diesem Bereich gegenüberliegenden Bereich der vom Kühlöl benetzten Innenwand des äußeren Kühlkanals können dabei Temperaturen von 240 bis 270 °C auftreten, die sich durch gelbe bis blaue Anlauffarben auf der Stahloberfläche des Kolbenoberteils bemerkbar machen und bereits in der Nähe bzw. über dem Flammpunkt von handelsüblichen Kühlölen für Dieselmotoren liegen. Die Erfahrung mit solchen im Betrieb befindlichen Kolben bestätigt die Vermutung, daß in dem genannten Bereich des äußeren Kühlkanals das Kühlöl sehr schnell verkokt und eine isolierende Ölkohleschicht bildet, die die Kühlwirkung in der Weise vermindert, daß die Temperaturen der brennraumseitigen Wand des Kühlkanals wesentlich erhöht und damit die Festigkeitswerte des Kolbenwerkstoffs absinken, der Kriechwiderstand verringert und die thermische Deformation erhöht werden. Dies kann, wie verschiedentlich beobachtet, zu bleibenden Verformungen führen. Diese Nachteile lassen sich jedoch durch die Anordnung des aus dem zwischen Ober- und Unterteil des Kolbens eingeklemmten Ringflansches und der damit verbundenen in den äußeren Kühlkanal hineinragenden Zunge bestehenden ölleitrings, durch den das in den Kühlkanal einlaufende Kühlöl entlang der Peripherie des Kühlkanals strömt, vermeiden. Dabei wird infolge der verlängerten Verweildauer des Kühlöls, seiner höheren relativen Geschwindigkeit zur Oberfläche des Kolbenwerkstoffs und durch den Abbau der laminaren Grenzschicht mittels Turbulenz im Kühlkanal eine verbesserte Kühlwirkung erzielt. Es hat sich jedoch gezeigt, daß die vom Kühlöl aufgenommene Wärme in aller Regel nicht ausreicht, um wenigstens den Bereich der ersten Kolbenringnut auf einer solchen Temperatur (ca. 150 °C) zu halten, daß auch nach längerer Laufzeit, insbesondere bei Teillastbetrieb oder Leerlauf, die Taupunkttemperatur der schwefligen Säure, die sich bei Kondensation des aus der Verbrennung von hochschwefelhaltigen Kraftstoffen entstehenden S03 bildet, nicht unterschritten wird und dadurch die sogenannte Naßkorrosion des Kolbens und der Kolbenringe unterbleibt.Such a piston type known from DE-OS 27 23 619 is particularly suitable for use in internal combustion engines machines, preferably medium-speed diesel engines, with the highest engine output and / or heavy oil operation. The cooling takes place by forced or injection cooling, the cooling oil flow being able to take place radially from the outside inwards or vice versa. The design of this piston construction is based on the knowledge that, in the case of built pistons with forced or injection cooling with shaker chambers in a standard design, the highest temperature of the piston crown of over 350 to 400 ° C on the outer oblique edge of the combustion chamber bowl due to the shape of the combustion chamber bowl - due to the design the jet of fuel injected - occurs. Temperatures of 240 to 270 ° C can occur in the area of the inner wall of the outer cooling channel wetted by the cooling oil, which are noticeable by yellow to blue tarnishing on the steel surface of the upper piston part and are already close to or above the flash point of commercially available cooling oils for diesel engines. Experience with such pistons in operation confirms the assumption that the cooling oil cokes very quickly in the area of the outer cooling duct and forms an insulating oil carbon layer, which reduces the cooling effect in such a way that the temperatures of the combustion chamber wall of the cooling duct are substantially increased and so that the strength values of the piston material decrease, the creep resistance is reduced and the thermal deformation is increased. As observed several times, this can lead to permanent deformations. However, these disadvantages can be avoided by the arrangement of the oil guide ring, which is clamped between the upper and lower part of the piston and the associated tongue protruding into the outer cooling channel, through which the cooling oil entering the cooling channel flows along the periphery of the cooling channel. Thereby, due to the extended dwell time of the cooling oil, its higher relative speed to the surface of the piston material and the degradation of the laminar boundary layer by means of turbulence in the cooling channel achieves an improved cooling effect. However, it has been shown that the heat absorbed by the cooling oil is generally not sufficient to at least keep the area of the first piston ring groove at such a temperature (approx. 150 ° C.) that even after a long running time, in particular during part-load operation or idling , the dew point temperature of the sulfurous acid, which is formed when the S0 3 resulting from the combustion of fuels containing high sulfur is condensed, is not fallen below, and the so-called wet corrosion of the piston and the piston rings is thereby avoided.

Es ist daher die Aufgabe der vorliegenden Erfindung, den eingangs beschriebenen Kolbentyp so zu gestalten, daß bei möglichst geringem Kühlöldurchsatz die Temperatur der brennraumseitigen Wand des äußeren Kühlkanals auf ein möglichst niedriges Niveau abgesenkt und gleichzeitig die Temperatur, wenigstens im Bereich der ersten Kolbenringnut auf einem solchen Niveau gehalten wird, daß keine Naßkorrosion des Kolbens und der Kolbenringe auftreten kann.It is therefore the object of the present invention to design the piston type described in the introduction in such a way that, with the lowest possible cooling oil throughput, the temperature of the wall of the outer cooling channel on the combustion chamber is reduced to the lowest possible level and, at the same time, the temperature, at least in the region of the first piston ring groove, is reduced to such a level Level is maintained that no wet corrosion of the piston and the piston rings can occur.

Gelöst ist diese Aufgabe dadurch, daß die Zunge des Ölleitrings mit der brennraumseitigen Wand des Kühlkanals einen vergleichsweise engen Ringspalt bildet. Durch den beim Hindurchströmen des Kühlöls durch den Ringspalt entstehenden Drosseleffekt wird der Druck des Kühlöls abgesenkt und dessen Strömungsgeschwindigkeit beträchtlich erhöht, so daß die von der brennraumseitigen Wand des Kühlkanals durch den relativ dünnschichtigen Kühlölfilm pro Zeiteinheit abgeführte Wärmemenge, verglichen mit dem Stand der Technik, deutlich größer und damit die Temperatur in diesem Bereich entsprechend niedriger ist. In der anschließenden Erweiterung hinter dem Ringspalt verwirbelt die Strömung. Die durch die Drosselung verminderte Kühlölmenge führt infolge des vergleichsweise großen Volumens des Kühlkanals zu einer verringerten Shakerwirkung und Kühlung im Bereich des Ringfeldes, insbesondere der ersten Kolbenringnut und zum Anstieg der Temperatur in diesem Bereich infolge Wärmeleitung vom Feuersteg nach unten, wodurch in der Kolbenringnut eine Temperatur von 140 bis 160 °C erzielt wird. Derartige Temperaturen verhindern auch bei Teillastbetrieb oder Leerlauf die Naßkorrosion des Kolbens und der Kolbenringe.This object is achieved in that the tongue of the oil guide ring forms a comparatively narrow annular gap with the wall of the cooling channel on the combustion chamber side. As a result of the throttling effect that occurs when the cooling oil flows through the annular gap, the pressure of the cooling oil is reduced and its flow velocity is increased considerably, so that the amount of heat dissipated per unit of time from the wall of the cooling channel on the combustion chamber side due to the relatively thin-film film of cooling oil compared to the prior art larger and thus the temperature in this area is correspondingly lower. Swirled behind the ring gap in the subsequent expansion the flow. Due to the comparatively large volume of the cooling channel, the quantity of cooling oil reduced by the throttling leads to a reduced shaker effect and cooling in the area of the ring field, in particular the first piston ring groove, and to an increase in the temperature in this area as a result of heat conduction from the top land downwards, as a result of which a temperature in the piston ring groove from 140 to 160 ° C is achieved. Such temperatures prevent the wet corrosion of the piston and the piston rings even during partial load operation or idling.

Die Zunge kann im Rahmen der Weiterbildung der Erfindung nach außen gekrümmt sein, so daß ihre innere Seitenfläche mit der brennraumseitigen Wand des Kühlkanals einen vergleichsweise langen Ringspalt bildet, wodurch die Aufnahme der einfallenden Wärmemenge weiter erhöht wird.As part of the development of the invention, the tongue can be curved outwards so that its inner side surface forms a comparatively long annular gap with the wall of the cooling channel on the combustion chamber side, as a result of which the absorption of the amount of heat incident is further increased.

Es besteht ferner die Möglichkeit, den Ringflansch und die Zunge aus unterschiedlichen Werkstoffen anzufertigen, insbesondere kann die Zunge aus einem Thermobimetall bestehen oder mit einer gleichartig wirkenden Regelvorrichtung, wie z.B. einem Thermostaten, versehen sein, so daß sich je nach abzuführender Wärmemenge die Höhe des zwischen Zunge und brennraumseitiger Wand des Kühlkanals bestehenden Ringspaltes selbsttätig vergrößern bzw. verkleinern kann, um in der Wirkungsweise eines Thermostaten die optimalen Kolbentemperatur lastunabhängig konstant zu halten. Im Leerlauf und bei niedrigen Kolbentemperaturen kann der Kühlöldurchlauf bis auf Pilotübertritte völlig abgesperrt werden.There is also the possibility of making the ring flange and the tongue from different materials, in particular the tongue can consist of a thermobimetal or with a regulating device of the same type, e.g. a thermostat, so that, depending on the amount of heat to be dissipated, the height of the annular gap between the tongue and the combustion chamber wall of the cooling channel can automatically increase or decrease in order to keep the optimum piston temperature constant regardless of the load in the way a thermostat works. When idling and at low piston temperatures, the cooling oil flow can be completely shut off, except for pilot transfers.

Der erfindungsgemäß gestaltete Kolben ist in der Zeichnung beispielhaft dargestellt und nachfolgend erläutert.The piston designed according to the invention is shown as an example in the drawing and explained below.

Der in Fig. 1 ausschnittsweise gezeigte Kolben besteht aus dem aus einer eutektischen Aluminium-Silizium-Legierung oder Sphäroguß hergestellten Kolbenunterteil 1 und dem aus Stahl bestehenden Kolbenoberteil 2, die über nicht dargestellte Zuganker miteinanderverbunden sind. Auf der Innenseite des Kolbens 3 befindet sich ein konzentrisch angeordneter Ringsteg 4, dessen radiale Außenwand die radiale innere Begrenzung des hinter dem Feuersteg 5 und der Ringpartie 6 angebrachten äußeren Kühlkanals 7 bildet und der den zentrisch angeordneten Kühlraum 8 einschließt. Zwischen dem Ringsteg 4 und der gegenüberliegenden Auflagefläche des Kolbenunterteils 1 ist ein Ringflansch 9 eingeklemmt, an dessen kühlkanalseitigem Rand eine in den Kühlkanal 7 hineinragende Zunge 10, deren innere Seitenfläche mit der brennraumseitigen Wand des Kühlkanals 7 einen vergleichsweise engen Ringspalt 11 bildet, angebracht ist. Über den Kühlmittelzulauf 12 strömt das Kühlöl in den Kühlraum 8 und von dort über die radialen in dem Ringsteg 4 angebrachten Durchbrüche 13 in den Kühlkanal 7. Durch die Anordnung der Zunge 10 tritt das Kühlöl durch den zwischen der Seitenfläche der Zunge und der brennraumseitigen Wand des Kühlkanals gebildeten Ringspalt 11 in den äußeren Teil des Kühlkanals 7 und fließt von dort über die Ablauföffnung 14 ab.The piston shown in detail in Fig. 1 consists of a eutectic aluminum-silicon alloy or spheroidal graphite cast iron piston lower part 1 and the piston upper part 2 made of steel, which are interconnected via tie rods, not shown. On the inside of the piston 3 there is a concentrically arranged ring web 4, the radial outer wall of which forms the radial inner boundary of the outer cooling channel 7 attached behind the top land 5 and the ring section 6 and which encloses the centrally arranged cooling chamber 8. An annular flange 9 is clamped between the annular web 4 and the opposite contact surface of the lower piston part 1, on the edge of the cooling channel side of which a tongue 10 protruding into the cooling channel 7, the inner side surface of which forms a comparatively narrow annular gap 11 with the wall of the cooling channel 7 on the combustion chamber side. Via the K ühlmittelzulauf 12, the cooling oil flows in the cooling chamber 8 and from there via the radial in the annular rib 4 attached to openings 13 into the cooling channel 7. The arrangement of the tongue 10 enters the cooling oil through between the side face of the tongue and the combustion chamber side wall of the cooling channel formed annular gap 11 in the outer part of the cooling channel 7 and flows from there through the drain opening 14.

Bei einer Abwandlung dieses Kolbens gemäß Fig. 2 strömt das Kühlöl über die Zuleitung 15 und den in den Kühlkanal 7 ragenden Ringflansch 17 in den inneren Teil des Kühlkanals 7. Die in den Kühlkanal 7 hineinragende nach außen gekrümmte Zunge 18 bildet mit der inneren Seitenfläche mit der brennraumseitigen Wand des Kühlkanals einen Ringspalt 19. Nach dem Austritt aus dem Ringspalt 19 strömt das Kühlöl aus dem Kühlkanal 7 über die radial im Ringflansch 17 angebrachten Durchbrüche 20 in den Kühlraum 8 und von dort über den Ablauf 21 in den Kurbelraum.2, the cooling oil flows via the feed line 15 and the ring flange 17 projecting into the cooling channel 7 into the inner part of the cooling channel 7. The outwardly curved tongue 18 protruding into the cooling channel 7 forms with the inner side surface the combustion chamber-side wall of the cooling channel has an annular gap 19. After emerging from the annular gap 19, the cooling oil flows from the cooling channel 7 via the openings 20 made radially in the annular flange 17 into the cooling chamber 8 and from there via the outlet 21 into the crank chamber.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß durch entsprechende Gestaltung und/oder Steuerung der mit der brennraumseitigen Wand des Kühlkanals einen Ringspalt bildenden Zunge eine Regelung der für das Oberteil des Kolbens zweckmäßigen Temperaturen möglich ist.The advantages achieved by the invention are, in particular, that by appropriate design and / or Control of the tongue forming an annular gap with the wall of the cooling channel on the combustion chamber allows regulation of the temperatures which are expedient for the upper part of the piston.

Claims (4)

1. Gebauten, flüssigkeitsgekühlten Kolben für Brennkraftmaschinen, insbesondere Dieselmotoren, dessen Unterteil, vorzugsweise aus einer Aluminium-Kolbenlegierung gebildet, mit dem Oberteil, vorzugsweise aus Eisenwerkstoff bestehend, über Schrauben verspannt und bei dem zwischen einem auf der Innenseite des Oberteils konzentrisch verlaufenden Ringsteg und einer diesem gegenüberliegenden Fläche des Unterteils ein mit einer in den äußeren Kühlkanal ragenden Zunge versehener Ringflansch eingeklemmt ist, wobei der Ringsteg sowohl die radial innere Begrenzung des im Oberteil im Bereich hinter dem Feuersteg und wenigstens einem Teil der Ringpartie befindlichen zur Verbindungsebene der beiden Kolbenbauteile offenen Kühlkanal bildet, als auch einen zentralen, mit dem Kühlkanal über radial angeordnete Kühlmittelbohrungen verbundenen, zur Verbindungsebene der beiden Kolbenbauteile offenen inneren Kühlraum einschließt und die Gewindebohrungen für die Schrauben trägt, und daß Kühlkanal und Kühlraum mit dem Kühlmittelumlaufsystem verbunden sind, dadurch gekennzeichnet, daß die Zunge (10, 18) mit der brennraumseitigen Wand des Kühlkanals (7) einen vergleichsweise engen Ringspalt (11, 19) bildet.1.Built, liquid-cooled pistons for internal combustion engines, in particular diesel engines, the lower part, preferably formed from an aluminum piston alloy, with the upper part, preferably made of iron material, braced by screws and in which between a ring web which is concentric on the inside of the upper part and one this opposite surface of the lower part is clamped with an annular flange provided with a tongue projecting into the outer cooling channel, the annular web forming both the radially inner boundary of the cooling channel located in the upper part in the area behind the top land and at least part of the ring section open to the connecting plane of the two piston components , as well as a central inner cooling chamber connected to the cooling channel via radially arranged coolant bores and open to the connecting plane of the two piston components and carrying the threaded bores for the screws, and that cooling channel and cooling chamber are connected to the coolant circulation system, characterized in that the tongue (10, 18) forms a comparatively narrow annular gap (11, 19) with the wall of the cooling channel (7) on the combustion chamber side. 2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß die Zunge (10) nach außen gekrümmt ausgebildet ist und ihre innere Seitenfläche mit der brennraumseitigen Wand des Kühlkanals (7) einen vergleichsweise langen Ringspalt (11, 19) bildet.2. Piston according to claim 1, characterized in that the tongue (10) is curved outward and its inner side surface with the combustion chamber side wall of the cooling channel (7) forms a comparatively long annular gap (11, 19). 3. Kolben nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Zunge (10, 18) aus einem Thermobimetall besteht.3. Piston according to claims 1 and 2, characterized in that the tongue (10, 18) consists of a bimetal. 4. Kolben nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Zunge (10, 18) durch einen Thermostaten steuerbar ist.4. Piston according to claims 1 and 2, characterized in that the tongue (10, 18) can be controlled by a thermostat.
EP84201953A 1984-02-02 1984-12-28 Assembled liquid-cooled piston for internal combustion engines Withdrawn EP0150542A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3403624 1984-02-02
DE19843403624 DE3403624A1 (en) 1984-02-02 1984-02-02 BUILT LIQUID-COOLED PISTON FOR INTERNAL COMBUSTION ENGINES

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EP0150542A2 true EP0150542A2 (en) 1985-08-07
EP0150542A3 EP0150542A3 (en) 1985-08-14

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EP84201953A Withdrawn EP0150542A3 (en) 1984-02-02 1984-12-28 Assembled liquid-cooled piston for internal combustion engines

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US (1) US4587932A (en)
EP (1) EP0150542A3 (en)
JP (1) JPS60182342A (en)
DE (1) DE3403624A1 (en)
DK (1) DK48485A (en)

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Also Published As

Publication number Publication date
JPS60182342A (en) 1985-09-17
US4587932A (en) 1986-05-13
EP0150542A3 (en) 1985-08-14
DE3403624A1 (en) 1985-08-08
DK48485A (en) 1985-08-03
DK48485D0 (en) 1985-02-01

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