EP1198667B1 - Liquid-cooled piston - Google Patents
Liquid-cooled piston Download PDFInfo
- Publication number
- EP1198667B1 EP1198667B1 EP00949192A EP00949192A EP1198667B1 EP 1198667 B1 EP1198667 B1 EP 1198667B1 EP 00949192 A EP00949192 A EP 00949192A EP 00949192 A EP00949192 A EP 00949192A EP 1198667 B1 EP1198667 B1 EP 1198667B1
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- European Patent Office
- Prior art keywords
- piston
- cooling channel
- cooling
- wave
- channel
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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
- F02F3/16—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
Definitions
- the invention relates to a liquid-cooled piston according to the preamble of claim 1.
- the pistons of internal combustion engines are subjected to high thermal loads due to the combustion occurring in the combustion chamber.
- a piston according to the preamble of claim 1 is known from DE-OS 30 19 953.
- This piston has an annular channel adjacent to a hole open towards the crankcase, through which the cooling oil can flow.
- the oil flows in these known pistons through an outlet bore, which is provided approximately in the center of the piston (seen in plan view).
- the annular channel is completely at a certain height of the piston. This will be a useful cooling of the land section, so the area located behind the piston rings, as well as the area reached below the combustion bowl.
- the particularly highly loaded in high-speed diesel engines pin bosses and the surrounding area are insufficiently cooled.
- the star-shaped cooling channels are designed so that they cool in particular the area behind the rings and the area of the combustion bowl. A satisfactory cooling of the pin boss area can only be ensured by the provision of complicated casting cores, which can be removed from the finished piston only with great effort.
- cooling channels of the piston according to DE 196 18 625 C1 are comparatively simple in design, they are so far away from the region of the pin boss that sufficient cooling does not take place in this zone.
- DE 197 36 135 C1 discloses a liquid-cooled piston with a cooling channel, which extends with two separate legs, starting from a radial edge region to the middle obliquely upward and then obliquely downward to the opposite radial edge region. Seen in plan view, the two legs form an overall X-shaped configuration. As a result, an improved cooling of the piston crown is to be achieved.
- the invention has for its object to provide an easy-to-manufacture liquid-cooled piston, which has a good cooling of both the annular region and the pin boss area, wherein the demands placed on the piston strength requirements should continue to be met.
- the cooling channel of the piston according to the invention which is seen in total as a whole in plan view is substantially annular or consists of a plurality of ring segments, formed wave-shaped in the direction of the piston axis.
- the cross section of the cooling channel remains substantially the same over the entire course of the cooling channel, so that, for example, in contrast to the piston according to DE-PS 17 51 342 no unnecessary complication of the shape of the cooling channel is required.
- the cooling channel extends with a substantially constant cross-section seen in a side view of the piston wave-shaped, so that it reaches from the area behind the piston rings in each case partially closer to the pin boss area, as is the case with the known pistons.
- a reliable cooling of both of these areas can be achieved.
- Due to the undulating shape there is also the advantage that the cooling channel becomes longer overall, so that it has a cooling surface which is larger than that of conventional cooling channels, and the cooling capacity is increased.
- the wave-shaped course of the cooling channel allows a smaller distance between the cooling channel and the ring carrier, since in the troughs each sufficient material remains behind the ring carrier, and thus a total of the strength requirements is satisfied.
- the wave-shaped course of the cooling channel also causes the cooling oil, unlike in known at a level remaining cooling channels, not directly flows through it, but with a longer residence time remains in the cooling channel, and thus can absorb more heat.
- the cooling of the areas surrounding the cooling channel is not only from a single side. In a sense, the cooling channel cools the adjacent areas not only from the cooling channel, but when considering a wave trough cooling takes place both from the wave trough, as well as from the two adjacent wave crests in the direction of Corrugation. Also by this mode of operation, the cooling performance can be improved.
- a shape of the cooling channel has proved to be particularly advantageous, in which the distance between wave trough and wave crest is more than 1.5 times the cooling channel cross-section.
- the distance measured in the direction of the piston axis from the lowest point of a wave trough to the highest point of a wave crest is at least 1.5 times the distance between the lowest point of a wave trough and the highest point of the cooling channel in the trough, which corresponds to the cooling channel cross section ,
- the measures according to the invention make it possible for the wall thickness between the cooling channel and ring carriers to be reduced to 0-10 mm, preferably 0-5 mm, in particular 0-2 mm.
- the wall thickness between the cooling channel and ring carriers can be reduced to 0-10 mm, preferably 0-5 mm, in particular 0-2 mm.
- the shape of the wave-shaped cooling channel is preferred that it has an odd number of complete waves in one half of its annular course.
- an odd number of To detect wave crests so that there is a wave crest in the area above the pin eye.
- a trough would be located here, so that in certain situations insufficient material strength remains between the trough and the pin eye.
- undesirable weakening of the piston can be reliably avoided if the number of waves is odd, so that above the pin bore a wave crest is that adapts particularly favorable in terms of its shape to the course of the upper half of the pin eye.
- an oval shape has proven to be particularly advantageous, wherein it is preferred for it to be oriented outwardly inclined.
- the upper portion of the oval-shaped cooling passage is closer to the outer wall of the piston than the lower portion.
- the piston 10 of the invention is shown in a side view in the direction of the pin boss 12.
- the piston 10 shown schematically has a ring carrier 14.
- the region of the ring carrier 14, as well as the region in the vicinity of the pin boss 12, is to be cooled particularly reliably.
- a (seen in plan view) largely annular, parallel to the circumference of the piston extending cooling channel 16 is provided.
- the cooling channel 16 extends in the form of a wave in the direction of the piston axis 18 such that it extends between these regions.
- a wave crest 20 is provided in a particularly advantageous manner above the pin boss 12, which ensures reliable cooling of the area with the ring carrier 14 together with the other crests.
- a comparatively small wall thickness remains between the wave crests 20 and the ring carrier 14, the overall strength is ensured since in the region of the wave troughs 22 the wall thickness behind the ring carrier 14 is not reduced so much.
- the cooling channel 16 extends in these sections particularly close to the pin boss 12, so that their surroundings can also be cooled well. 1, the preferred embodiment according to which the number of complete wave crests in one half of the cooling channel is odd, is located in the example shown in FIG. 1 above the pin boss 12, a wave crest, so that also in this area sufficient wall thickness remains.
- This area is different in the embodiment shown in more detail in FIG. 2.
- a suitable design of the wave-shaped cooling channel 16 By means of a suitable design of the wave-shaped cooling channel 16, however, a sufficient material thickness can also be achieved in this embodiment in the area above the bolt eye 12.
- a ring carrier 14 can be seen in detail, to which the cooling channel 16 in the region of the wave crests reaches comparatively close. 2
- the cooling channel 16 is designed in the example shown with an oval extending in the direction of the piston axis 18, wherein this is inclined slightly outwards.
- the distance from the lowest point of a wave trough 22 to the highest point of a wave crest 20 is approximately twice the cooling channel cross section, as can be seen in the side view of FIG. 2.
- FIG. 3 the interior of the cooling channel 16 is shown in a perspective view.
- a casting core which is introduced during the casting of the piston 10 according to the invention would have approximately the shape shown in FIG. 3.
- the illustration shows that the cooling channel 16 in the example shown has two diametrically opposite inflow points.
- the cooling channel 16 is formed overall by two ring-segment-shaped sections as seen in plan view, each of which almost corresponds to the drainage region Have the shape of a semicircle. In this way, together with the inlet or outlet regions 26, a generally largely annular shape of the cooling channel 16 results.
- the cooling channel first extends as far as a first wave crest 20a in the direction of the piston crown.
- the other half of the overall annular cooling channel 16 is designed in a similar manner.
- the odd number of five complete waves in the half of the cooling channel 16 explained above causes a wave crest, designated 20c in the shown case, to be located above the pin eye.
- the required wall thickness can be ensured in all areas, with reliable cooling of the area in the vicinity of the pin eye being achieved, in particular, by the adjacent wave troughs 22b and 22c.
- the cooling channel extends with the interior shown in Fig. 3 particularly close to the ring carrier of the piston, so that this area is reliably cooled. Furthermore, there is a larger inner surface of the Cooling channel, compared with a course of the cooling channel, which remains at a certain level, as well as a longer residence time of the cooling oil, so that the cooling capacity can be increased overall. As can be seen from Fig. 3, results for the shape of the interior of the cooling channel 16 a total of a "crown-like" shape.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
Die Erfindung betrifft einen flüssigkeitsgekühlten Kolben gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a liquid-cooled piston according to the preamble of claim 1.
Die Kolben von Verbrennungsmotoren sind aufgrund der in dem Brennraum stattfindenden Verbrennungen hohen thermischen Belastungen unterworfen. Hierbei ist es insbesondere bei Dieselmotoren und aufgeladenen Motoren zweckmäßig, die Kühlung der Kolben durch die Zuführung von Kühlmittel zu Hohlräumen in dem Kolben zu gewährleisten.The pistons of internal combustion engines are subjected to high thermal loads due to the combustion occurring in the combustion chamber. In this case, it is expedient in particular for diesel engines and supercharged engines to ensure the cooling of the pistons by the supply of coolant to cavities in the piston.
Ein Kolben gemäß dem Oberbegriff des Anspruchs 1 ist aus der DE-OS 30 19 953 bekannt. Dieser Kolben weist einen ringförmigen Kanal auf, an den eine zum Kurbelraum hin offene Bohrung angrenzt, durch die das Kühlöl einströmen kann. Das Öl fließt bei diesen bekannten Kolben durch eine Auslassbohrung aus, die in etwa im Zentrum des Kolbens (in der Draufsicht gesehen) vorgesehen ist. Ebenso ist es denkbar, den Kühlmittelabfluss an einer dem Zufluss diametral gegenüberliegenden Stelle vorzusehen. Bei dem bekannten Kolben befindet sich der ringförmige Kanal vollständig auf einer bestimmten Höhe des Kolbens. Hierdurch wird eine brauchbare Kühlung des Feuerstegbereichs, also des Bereichs, der sich hinter den Kolbenringen befindet, sowie des Bereichs unterhalb der Brennraummulde erreicht. Die insbesondere bei schnellaufenden Dieselmotoren besonders hoch belasteten Bolzenaugen und der diese umgebende Bereich werden jedoch nur unzureichend gekühlt.A piston according to the preamble of claim 1 is known from DE-OS 30 19 953. This piston has an annular channel adjacent to a hole open towards the crankcase, through which the cooling oil can flow. The oil flows in these known pistons through an outlet bore, which is provided approximately in the center of the piston (seen in plan view). Likewise, it is conceivable to provide the coolant outflow at a location diametrically opposite the inflow. In the known piston, the annular channel is completely at a certain height of the piston. This will be a useful cooling of the land section, so the area located behind the piston rings, as well as the area reached below the combustion bowl. However, the particularly highly loaded in high-speed diesel engines pin bosses and the surrounding area are insufficiently cooled.
Dieser Nachteil gilt auch für den Kolben gemäß der DE 195 22 756 A1, bei dem durch Bohrungen, die weitgehend in Richtung der Kolbenachse verlaufen, eine Kühlung des Bereichs hinter den Kolbenringen erreicht wird.This disadvantage also applies to the piston according to DE 195 22 756 A1, in which a cooling of the area behind the piston rings is achieved by bores which extend largely in the direction of the piston axis.
Auch beim Kolben gemäß der DE 34 44 661 A1 sind die sternförmig angeordneten Kühlkanäle so ausgebildet, dass sie insbesondere den Bereich hinter den Ringen sowie den Bereich der Brennraummulde kühlen. Eine zufriedenstellende Kühlung des Bolzennabenbereichs kann nur durch das Vorsehen komplizierter Gießkerne gewährleistet werden, die von dem fertigen Kolben nur mit großem Aufwand zu entfernen sind.Also in the piston according to DE 34 44 661 A1, the star-shaped cooling channels are designed so that they cool in particular the area behind the rings and the area of the combustion bowl. A satisfactory cooling of the pin boss area can only be ensured by the provision of complicated casting cores, which can be removed from the finished piston only with great effort.
Die Kühlkanäle des Kolbens gemäß der DE 196 18 625 C1 sind zwar vergleichsweise einfach gestaltet, sie liegen jedoch von dem Bereich der Bolzennabe so weit entfernt, dass in dieser Zone keine hinreichende Kühlung erfolgt.Although the cooling channels of the piston according to DE 196 18 625 C1 are comparatively simple in design, they are so far away from the region of the pin boss that sufficient cooling does not take place in this zone.
Aus der nicht vorveröffentlichten DE 198 10 937 C1 ist ein Kolben bekannt, der einen ringförmigen Kühlkanal aufweist, dessen Oberseite asymmetrische Rampen, und dessen Unterseite dazu in Umfangsrichtung versetzte Mulden aufweist. Hierdurch soll eine gute Förderung des Öls durch den Kühlkanal erreicht werden.From the non-prepublished DE 198 10 937 C1, a piston is known, which has an annular cooling channel, the upper side asymmetric ramps, and the underside of which has circumferentially offset troughs. As a result, a good promotion of the oil to be achieved through the cooling channel.
Die DE 197 36 135 C1 offenbart einen flüssigkeitsgekühlten Kolben mit einem Kühlkanal, der mit zwei getrennten Schenkeln ausgehend von einem radialen Randbereich bis zur Mitte schräg nach oben und anschließend bis zu dem gegenüber liegenden radialen Randbereich schräg nach unten verläuft. Die beiden Schenkel bilden in der Draufsicht gesehen insgesamt eine X-förmige Gestalt aus. Hierdurch soll eine verbesserte Kühlung des Kolbenbodens erreicht werden.DE 197 36 135 C1 discloses a liquid-cooled piston with a cooling channel, which extends with two separate legs, starting from a radial edge region to the middle obliquely upward and then obliquely downward to the opposite radial edge region. Seen in plan view, the two legs form an overall X-shaped configuration. As a result, an improved cooling of the piston crown is to be achieved.
Schließlich ist aus der DE-PS 17 51 342 ein Kolben für Brennkraftmaschinen mit schräg- oder horizontalliegendem Zylinder bekannt, bei dem an den Innenwänden des Kühlkanals gegeneinander versetzte Stufen vorgesehen sind, um eine zuverlässige Förderung und Durchströmung des Kühlkanals auch bei schrägliegendem Kolben zu erreichen. Auch in diesem Fall ist der Kühlkanal jedoch zu weit von dem Bolzennabenbereich entfernt, um in dieser Zone bei modernen, schnellaufenden Dieselmotoren und aufgeladenen Motoren eine zuverlässige Kühlung sicherzustellen. Ferner erfordert auch diese aufwendige innere Gestaltung des Kühlkanals aufwendige Gießkerne.Finally, from DE-PS 17 51 342 a piston for internal combustion engines with obliquely or horizontalliegendem cylinder is known in which staggered steps are provided on the inner walls of the cooling channel to achieve a reliable delivery and flow through the cooling channel even at oblique piston. However, in this case as well, the cooling channel is too far away from the pin boss area to ensure reliable cooling in this zone in modern, high-speed diesel engines and turbocharged engines. Furthermore, this complex internal design of the cooling channel requires elaborate casting cores.
Der Erfindung liegt die Aufgabe zugrunde, einen leicht zu fertigenden flüssigkeitsgekühlten Kolben zu schaffen, der eine gute Kühlung sowohl des Ringbereichs als auch des Bolzennabenbereichs aufweist, wobei die an den Kolben gestellten Festigkeitsanforderungen weiterhin erfüllt bleiben sollen.The invention has for its object to provide an easy-to-manufacture liquid-cooled piston, which has a good cooling of both the annular region and the pin boss area, wherein the demands placed on the piston strength requirements should continue to be met.
Die Lösung dieser Aufgabe erfolgt durch die Merkmale des Patentanspruchs 1.The solution of this object is achieved by the features of patent claim 1.
Demzufolge ist der Kühlkanal des erfindungsgemäßen Kolbens, der insgesamt in der Draufsicht gesehen weitgehend ringförmig ist oder aus mehreren Ringsegmenten besteht, in Richtung der Kolbenachse wellenförmig ausgebildet. Hierbei bleibt der Querschnitt des Kühlkanals im wesentlichen über den gesamten Verlauf des Kühlkanals gleich, so dass beispielsweise im Gegensatz zu dem Kolben gemäß der DE-PS 17 51 342 keine unnötige Verkomplizierung der Gestalt des Kühlkanals erforderlich ist.Accordingly, the cooling channel of the piston according to the invention, which is seen in total as a whole in plan view is substantially annular or consists of a plurality of ring segments, formed wave-shaped in the direction of the piston axis. Here, the cross section of the cooling channel remains substantially the same over the entire course of the cooling channel, so that, for example, in contrast to the piston according to DE-PS 17 51 342 no unnecessary complication of the shape of the cooling channel is required.
Vielmehr verläuft der Kühlkanal mit weitgehend gleichbleibendem Querschnitt in einer Seitenansicht des Kolbens gesehen wellenförmig, so dass er von dem Bereich hinter den Kolbenringen jeweils abschnittsweise näher an den Bolzennabenbereich heranreicht, als dies bei den bekannten Kolben der Fall ist. Hierdurch kann eine zuverlässige Kühlung beider dieser Bereiche erreicht werden. Durch die wellenförmige Gestalt ergibt sich darüber hinaus der Vorteil, dass der Kühlkanal insgesamt länger wird, so dass er eine gegenüber herkömmlichen Kühlkanälen vergrößerte Kühloberfläche aufweist, und die Kühlleistung erhöht wird. Außerdem ermöglicht der wellenförmige Verlauf des Kühlkanals einen geringeren Abstand zwischen dem Kühlkanal und dem Ringträger, da in den Wellentälern jeweils genügend Material hinter dem Ringträger verbleibt, und somit insgesamt den Festigkeitsanforderungen genügt wird.Rather, the cooling channel extends with a substantially constant cross-section seen in a side view of the piston wave-shaped, so that it reaches from the area behind the piston rings in each case partially closer to the pin boss area, as is the case with the known pistons. As a result, a reliable cooling of both of these areas can be achieved. Due to the undulating shape, there is also the advantage that the cooling channel becomes longer overall, so that it has a cooling surface which is larger than that of conventional cooling channels, and the cooling capacity is increased. In addition, the wave-shaped course of the cooling channel allows a smaller distance between the cooling channel and the ring carrier, since in the troughs each sufficient material remains behind the ring carrier, and thus a total of the strength requirements is satisfied.
Der wellenförmige Verlauf des Kühlkanals bewirkt außerdem, dass das Kühlöl, anders als bei bekannten, auf einem Niveau verbleibenden Kühlkanälen, nicht direkt durch diese hindurchströmt, sondern mit längerer Verweildauer in dem Kühlkanal verbleibt, und somit mehr Wärme aufnehmen kann. Schließlich erfolgt die Kühlung der den Kühlkanal umgebenden Bereiche anders als bei herkömmlichen Kühlkanälen nicht nur von einer einzigen Seite aus. Gewissermaßen kühlt der Kühlkanal die anliegenden Bereiche nicht nur von dem Kühlkanal ausgehend, sondern bei Betrachtung eines Wellentals erfolgt die Kühlung sowohl von dem Wellental ausgehend, als auch von den beiden benachbarten Wellenbergen in Richtung des Wellentals. Auch durch diese Wirkungsweise kann die Kühlleistung verbessert werden.The wave-shaped course of the cooling channel also causes the cooling oil, unlike in known at a level remaining cooling channels, not directly flows through it, but with a longer residence time remains in the cooling channel, and thus can absorb more heat. Finally, unlike conventional cooling channels, the cooling of the areas surrounding the cooling channel is not only from a single side. In a sense, the cooling channel cools the adjacent areas not only from the cooling channel, but when considering a wave trough cooling takes place both from the wave trough, as well as from the two adjacent wave crests in the direction of Corrugation. Also by this mode of operation, the cooling performance can be improved.
Bevorzugte Weiterbildungen der Erfindung sind in den weiteren Ansprüchen beschrieben.Preferred developments of the invention are described in the further claims.
Bei Versuchen hat sich eine Gestalt des Kühlkanals als besonders vorteilhaft erwiesen, bei welcher der Abstand zwischen Wellental und Wellenberg mehr als das 1,5-fache des Kühlkanalquerschnitts beträgt. Mit anderen Worten beträgt der in Richtung der Kolbenachse gemessene Abstand vom tiefsten Punkt eines Wellentales zum höchsten Punkt eines Wellenberges mindestens das 1,5-fache des Abstands zwischen dem tiefsten Punkt eines Wellentales und dem höchsten Punkt des Kühlkanals in dem Wellental, was dem Kühlkanalquerschnitt entspricht.In experiments, a shape of the cooling channel has proved to be particularly advantageous, in which the distance between wave trough and wave crest is more than 1.5 times the cooling channel cross-section. In other words, the distance measured in the direction of the piston axis from the lowest point of a wave trough to the highest point of a wave crest is at least 1.5 times the distance between the lowest point of a wave trough and the highest point of the cooling channel in the trough, which corresponds to the cooling channel cross section ,
In besonders vorteilhafter Weise ermöglichen es die erfindungsgemäßen Maßnahmen, dass die Wanddicke zwischen Kühlkanal und Ringträgern auf 0-10 mm, vorzugsweise 0-5 mm, insbesondere 0-2 mm verringert ist. Hierdurch kann zur Verbesserung der Kühlung der Kühlkanal besonders nah an den Ringträger herangeführt werden und diesen sogar berühren, so dass stellenweise die innenseitige Oberfläche des Ringträgers den Kühlkanal begrenzt. Hierbei verbleibt durch den wellenartigen Verlauf im Bereich der Wellentäler eine ausreichende Wanddicke, um insgesamt für eine ausreichende Festigkeit zu sorgen.In a particularly advantageous manner, the measures according to the invention make it possible for the wall thickness between the cooling channel and ring carriers to be reduced to 0-10 mm, preferably 0-5 mm, in particular 0-2 mm. As a result, to improve the cooling of the cooling channel can be brought very close to the ring carrier and even touch it, so that in places the inside surface of the ring carrier limits the cooling channel. This remains due to the wave-like course in the troughs a sufficient wall thickness to provide overall sufficient strength.
Für die Gestalt des wellenförmigen Kühlkanals wird bevorzugt, dass dieser in einer Hälfte seines ringförmigen Verlaufs eine ungerade Anzahl von vollständigen Wellen aufweist. Mit anderen Worten sind bei einer gedachten, durch den Kühlkanal geführten seitlichen Schnittansicht eine ungerade Anzahl von Wellenbergen zu erkennen, so dass sich im Bereich oberhalb des Bolzenauges ein Wellenberg befindet. Im Fall einer geraden Anzahl würde sich hier ein Wellental befinden, so dass in bestimmten Situationen eine nicht ausreichende Materialstärke zwischen dem Wellental und dem Bolzenauge verbleibt. Eine derartige, nicht erwünschte Schwächung des Kolbens kann zuverlässig vermieden werden, wenn die Anzahl der Wellen ungerade ist, so dass sich oberhalb der Bolzenbohrung ein Wellenberg befindet, der sich hinsichtlich seiner Form besonders günstig an den Verlauf der oberen Hälfte des Bolzenauges anpasst.For the shape of the wave-shaped cooling channel is preferred that it has an odd number of complete waves in one half of its annular course. In other words, in an imaginary, guided through the cooling channel lateral sectional view an odd number of To detect wave crests so that there is a wave crest in the area above the pin eye. In the case of an even number, a trough would be located here, so that in certain situations insufficient material strength remains between the trough and the pin eye. Such, undesirable weakening of the piston can be reliably avoided if the number of waves is odd, so that above the pin bore a wave crest is that adapts particularly favorable in terms of its shape to the course of the upper half of the pin eye.
Schließlich hat sich hinsichtlich der Querschnittsform des Kühlkanals eine ovale Gestalt als besonders vorteilhaft erwiesen, wobei für diese bevorzugt wird, dass sie nach außen geneigt ausgerichtet ist. Mit anderen Worten befindet sich in einer Schnittansicht gesehen der obere Bereich des oval gestalteten Kühlkanals näher an der Außenwand des Kolbens als der untere Bereich.Finally, with regard to the cross-sectional shape of the cooling channel, an oval shape has proven to be particularly advantageous, wherein it is preferred for it to be oriented outwardly inclined. In other words, in a sectional view, the upper portion of the oval-shaped cooling passage is closer to the outer wall of the piston than the lower portion.
Nachfolgend wird eine beispielhaft in den Zeichnungen dargestellte Ausführungsform der Erfindung näher erläutert.
Es zeigen:
- Fig. 1
- eine schematische Seitenansicht des erfindungsgemäßen Kolbens;
- Fig. 2
- eine Seitenansicht des erfindungsgemäßen Kolbens mit Teilschnitt; und
- Fig. 3
- eine perspektivische Ansicht des Innenraums des Kühlkanals des erfindungsgemäßen Kolbens.
Show it:
- Fig. 1
- a schematic side view of the piston according to the invention;
- Fig. 2
- a side view of the piston according to the invention with a partial section; and
- Fig. 3
- a perspective view of the interior of the cooling passage of the piston according to the invention.
In Fig. 1 ist der erfindungsgemäße Kolben 10 in einer Seitenansicht in Richtung der Bolzennabe 12 gesehen dargestellt. In seinem oberen Bereich weist der schematisch gezeigte Kolben 10 einen Ringträger 14 auf. Der Bereich des Ringträgers 14 ist ebenso wie der Bereich in der Umgebung der Bolzennabe 12 besonders zuverlässig zu kühlen. Zu diesem Zweck ist ein (in der Draufsicht gesehen) weitgehend ringförmig, parallel zu dem Umfang des Kolbens verlaufender Kühlkanal 16 vorgesehen.In Fig. 1, the
Um eine zuverlässige Kühlung des Bereichs des Ringträgers 14 und der Zonen in der Umgebung der Bolzennabe 12 miteinander zu kombinieren, verläuft der Kühlkanal 16 erfindungsgemäß derart in Richtung der Kolbenachse 18 wellenförmig, dass er sich zwischen diesen Bereichen erstreckt. Bei dem gezeigten Ausführungsbeispiel ist in besonders vorteilhafter Weise oberhalb der Bolzennabe 12 ein Wellenberg 20 vorgesehen, der zusammen mit den weiteren Wellenbergen eine zuverlässige Kühlung des Bereichs mit dem Ringträger 14 sicherstellt. Wenngleich zwischen den Wellenbergen 20 und dem Ringträger 14 eine vergleichsweise geringe Wanddicke verbleibt, ist die Festigkeit insgesamt sichergestellt, da im Bereich der Wellentäler 22 die Wanddicke hinter dem Ringträger 14 nicht so stark verringert ist.In order to combine a reliable cooling of the region of the
Durch die Wellentäler 22 reicht der Kühlkanal 16 in diesen Abschnitten besonders nah an die Bolzennabe 12 heran, so dass auch deren Umgebung gut gekühlt werden kann. Durch die in Fig. 1 zu erkennende, bevorzugte Maßnahme, wonach die Zahl der vollständigen Wellenberge in einer Hälfte des Kühlkanals ungerade ist, befindet sich bei dem in Fig. 1 gezeigten Beispiel oberhalb der Bolzennabe 12 ein Wellenberg, so dass auch in diesem Bereich eine hinreichende Wanddicke verbleibt.Due to the
Dieser Bereich ist bei dem in Fig. 2 in detaillierterer Art und Weise dargestellten Ausführungsbeispiel anders gestaltet. Durch eine geeignete Gestaltung des wellenförmigen Kühlkanals 16 kann jedoch auch bei dieser Ausführungsform in dem Bereich oberhalb des Bolzenauges 12 eine hinreichende Materialstärke erreicht werden. In der Schnittdarstellung im linken Bereich von Fig. 2 ist im einzelnen ein Ringträger 14 zu erkennen, an den der Kühlkanal 16 im Bereich der Wellenberge vergleichsweise nah heranreicht. Wie sich aus der Schnittdarstellung von Fig. 2 ergänzend ergibt, ist der Kühlkanal 16 bei dem gezeigten Beispiel mit einem in Richtung der Kolbenachse 18 verlaufenden Oval gestaltet, wobei dieses ein wenig nach außen geneigt ist. Wie in Fig. 2 ebenfalls zu erkennen ist, beträgt der Abstand vom tiefsten Punkt eines Wellentales 22 zum höchsten Punkt eines Wellenberges 20 in etwa das Doppelte des Kühlkanalquerschnitts, wie er in der Seitenansicht von Fig. 2 zu erkennen ist.This area is different in the embodiment shown in more detail in FIG. 2. By means of a suitable design of the wave-shaped
In Fig. 3 ist in einer perspektivischen Ansicht der Innenraum des Kühlkanals 16 dargestellt. Gewissermaßen hätte ein Gießkern, der beim Gießen des erfindungsgemäßen Kolbens 10 eingebracht wird, in etwa die in Fig. 3 gezeigte Gestalt. Aus der Darstellung ergibt sich, dass der Kühlkanal 16 bei dem gezeigten Beispiel zwei diametral gegenüberliegende Einström- bzw. Ablassbereiche 26 aufweist, deren Querschnitt in etwa doppelt so groß ist wie die Querschnittsfläche des Kühlkanals 16. Ausgehend von dem jeweiligen Eintritts- bzw. Ablassbereich 26 wird der Kühlkanal 16 insgesamt durch zwei in der Draufsicht gesehen ringsegmentförmige Abschnitte gebildet, die jeweils nahezu die Form eines Halbkreises aufweisen. Hierdurch ergibt sich zusammen mit den Eintritts- bzw. Ablassbereichen 26 eine insgesamt weitgehend ringförmige Gestalt des Kühlkanals 16. Ausgehend von dem jeweiligen Eintritts- bzw. Ablassbereich 26 verläuft der Kühlkanal zunächst bis zu einem ersten Wellenberg 20a in Richtung des Kolbenbodens. An diesen ersten Wellenberg 20a schließt sich ein Wellental 22a sowie drei vollständige Wellenberge 20b, 20c, 20d an, bevor der Kühlkanal über einen letzten Wellenberg 20e in den gegenüberliegenden Eintritts- bzw. Ablassbereich 26 mündet. Die andere Hälfte des insgesamt ringförmigen Kühlkanals 16 ist in ähnlicher Weise gestaltet.In Fig. 3, the interior of the cooling
Wie bereits unter Bezugnahme auf die Fig. 1 angedeutet, bewirkt die ungerade Anzahl von in dem gezeigten Fall fünf vollständigen Wellen in der oben erläuterten Hälfte des Kühlkanals 16, dass sich oberhalb des Bolzenauges ein Wellenberg, in dem gezeigten Fall mit 20c bezeichnet, befindet. Hierdurch kann, wie erwähnt, in sämtlichen Bereichen die erforderliche Wanddicke sichergestellt werden, wobei insbesondere durch die benachbarten Wellentäler 22b und 22c eine zuverlässige Kühlung des Bereichs in der Umgebung des Bolzenauges erreicht wird.As already indicated with reference to FIG. 1, the odd number of five complete waves in the half of the cooling
Mit den Wellenbergen 20 reicht der Kühlkanal mit dem in Fig. 3 dargestellten Innenraum besonders nah an den Ringträger des Kolbens heran, so dass auch dieser Bereich zuverlässig gekühlt wird. Ferner ergibt sich eine größere Innenfläche des Kühlkanals, verglichen mit einem Verlauf des Kühlkanals, der auf einem bestimmten Niveau verbleibt, sowie eine längere Verweildauer des Kühlöls, so dass die Kühlleistung insgesamt erhöht werden kann. Wie aus Fig. 3 zu erkennen ist, ergibt sich für die Gestalt des Innenraums des Kühlkanals 16 insgesamt eine "kronenartige" Form.With the wave crests 20, the cooling channel extends with the interior shown in Fig. 3 particularly close to the ring carrier of the piston, so that this area is reliably cooled. Furthermore, there is a larger inner surface of the Cooling channel, compared with a course of the cooling channel, which remains at a certain level, as well as a longer residence time of the cooling oil, so that the cooling capacity can be increased overall. As can be seen from Fig. 3, results for the shape of the interior of the cooling channel 16 a total of a "crown-like" shape.
Claims (4)
- Liquid-cooled piston (10) for internal combustion engines with an annular cooling channel (16), or one consisting of several ring segments, having a cross-section which largely remains identical over its course, characterised in that the channel (16) runs at least in sections in waves in the direction of the axis (18) of the piston and in that the distance from the wave trough (22) to the wave crest amounts to more than 1.5 times the dimension of the cooling channel in the direction of the axis (18) of the piston.
- Piston according to claim 1, characterised in that the wall thickness between the cooling channel (16) and ring carriers (14) has been reduced to 0-10 mm, preferably 0-5 mm, in particular 0-2 mm.
- Piston according to claim 1 or 2, characterised in that the number of complete waves in one half of the cooling channel (16) is uneven, so there is a wave crest (20c) above the bolt eye (12).
- Piston according to at least one of the preceding claims, characterised in that the cross-section of the cooling channel (16) is substantially oval and preferably directed inclined towards the outside.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19930630 | 1999-07-02 | ||
| DE19930630A DE19930630C1 (en) | 1999-07-02 | 1999-07-02 | Liquid-cooled piston for I.C. engines has an annular cooling channel that runs in an undulating fashion in the direction of the piston axis |
| PCT/EP2000/005633 WO2001002713A1 (en) | 1999-07-02 | 2000-06-19 | Liquid-cooled piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1198667A1 EP1198667A1 (en) | 2002-04-24 |
| EP1198667B1 true EP1198667B1 (en) | 2006-02-08 |
Family
ID=7913478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00949192A Expired - Lifetime EP1198667B1 (en) | 1999-07-02 | 2000-06-19 | Liquid-cooled piston |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6499386B2 (en) |
| EP (1) | EP1198667B1 (en) |
| JP (1) | JP2003526755A (en) |
| AT (1) | ATE317497T1 (en) |
| BR (1) | BR0011981B1 (en) |
| DE (2) | DE19930630C1 (en) |
| ES (1) | ES2256023T3 (en) |
| PL (1) | PL198900B1 (en) |
| WO (1) | WO2001002713A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016004699A1 (en) | 2016-04-16 | 2016-12-22 | Daimler Ag | Piston for a reciprocating engine |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10106435A1 (en) * | 2001-02-13 | 2002-08-14 | Bayerische Motoren Werke Ag | Pistons, in particular for an internal combustion engine |
| DE10126359B4 (en) * | 2001-05-30 | 2004-07-22 | Federal-Mogul Nürnberg GmbH | Pistons for an internal combustion engine |
| DE10158607B4 (en) * | 2001-11-29 | 2005-10-06 | Federal-Mogul Nürnberg GmbH | Liquid-cooled piston for internal combustion engine |
| DE10218999B4 (en) * | 2002-04-27 | 2005-03-03 | Ks Kolbenschmidt Gmbh | Piston with ring carrier and mold cooling channel |
| DE10244513A1 (en) * | 2002-09-25 | 2004-04-08 | Mahle Gmbh | Multi-part cooled piston for an internal combustion engine and method for its production |
| DE102004043720A1 (en) * | 2004-09-09 | 2006-03-30 | Federal-Mogul Nürnberg GmbH | Piston for an internal combustion engine and internal combustion engine |
| DE102004056870A1 (en) * | 2004-11-25 | 2006-06-01 | Mahle International Gmbh | Piston having a cooling passage for an internal combustion engine and method of manufacturing the piston |
| DE102006056012A1 (en) | 2006-11-28 | 2008-05-29 | Ks Kolbenschmidt Gmbh | Variable design cooling channel for one piston |
| DE202006020280U1 (en) * | 2006-11-28 | 2008-02-21 | Ks Kolbenschmidt Gmbh | Cooling channel piston |
| DE102006056011A1 (en) * | 2006-11-28 | 2008-05-29 | Ks Kolbenschmidt Gmbh | Liquid-cooled piston for e.g. diesel internal-combustion engine, has medium in free jet of nozzles entering into openings, where jet is directed parallel to longitudinal axis of piston, and lower side loaded with medium by jet |
| DE102008002571A1 (en) * | 2008-06-20 | 2009-12-31 | Federal-Mogul Nürnberg GmbH | Piston for an internal combustion engine |
| DE102009001888C5 (en) * | 2009-03-26 | 2019-12-24 | Federal-Mogul Nürnberg GmbH | Pistons for an internal combustion engine |
| US9970384B2 (en) | 2009-11-06 | 2018-05-15 | Federal-Mogul Llc | Steel piston with cooling gallery and method of construction thereof |
| US8807109B2 (en) * | 2009-11-06 | 2014-08-19 | Federal-Mogul Corporation | Steel piston with cooling gallery and method of construction thereof |
| DE102010020227B4 (en) | 2010-05-11 | 2023-10-26 | Ks Kolbenschmidt Gmbh | Method for generating an arbitrarily designed geometry on pistons of internal combustion engines and a device for carrying out the method |
| DE102010051033A1 (en) | 2010-11-11 | 2012-05-16 | Daimler Ag | Liquid-cooled piston of an internal combustion engine |
| US8863381B2 (en) * | 2010-12-22 | 2014-10-21 | GM Global Technology Operations LLC | Method of making a piston oil gallery using a hollow metallic core |
| DE102011076455A1 (en) * | 2011-05-25 | 2012-11-29 | Mahle International Gmbh | Casting core for forming a cooling channel in a piston |
| JP2014185522A (en) * | 2013-03-21 | 2014-10-02 | Hitachi Automotive Systems Ltd | Piston of internal combustion engine |
| DE102015213689A1 (en) * | 2015-07-21 | 2017-01-26 | Federal-Mogul Nürnberg GmbH | Piston for an internal combustion engine |
| EP3452712A1 (en) | 2016-05-04 | 2019-03-13 | KS Kolbenschmidt GmbH | Piston |
| CN108999717A (en) * | 2018-08-15 | 2018-12-14 | 全椒县全动机械有限公司 | A kind of diesel engine piston structure |
| GB2578803B (en) * | 2019-04-04 | 2020-12-16 | Cox Powertrain Ltd | Marine outboard motor with piston cooling gallery |
| CN110513182A (en) * | 2019-09-25 | 2019-11-29 | 深圳臻宇新能源动力科技有限公司 | Piston looling system |
| DE102020000321A1 (en) | 2020-01-21 | 2021-07-22 | Ford Global Technologies, Llc | Internal combustion engine with cooled piston and method for producing an associated piston |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1751342B1 (en) * | 1968-05-14 | 1970-06-18 | Alcan Aluminiumwerke | Piston with ring-shaped cooling channel arranged in the piston head |
| US4180027A (en) * | 1977-07-20 | 1979-12-25 | Mack Trucks, Inc. | Two-piece oil-cooled piston |
| IT1118774B (en) * | 1979-06-12 | 1986-03-03 | Ass Eng Italia | IMPROVEMENT RELATED TO MUFFLERS IN DIESEL ENGINES |
| JPS6114603Y2 (en) * | 1979-11-22 | 1986-05-07 | ||
| JPS56122751U (en) * | 1980-02-18 | 1981-09-18 | ||
| DE3444661A1 (en) * | 1984-12-07 | 1986-06-12 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Liquid-cooled piston |
| US4867119A (en) * | 1988-10-21 | 1989-09-19 | Caterpillar Inc. | Engine piston assembly and forged piston member therefor having a cooling recess |
| DE19522756A1 (en) * | 1995-06-27 | 1997-01-02 | Kolbenschmidt Ag | Reciprocating piston for IC engine |
| DE19618625C1 (en) | 1996-05-09 | 1997-10-23 | Daimler Benz Ag | Liquid-cooled pistons for internal combustion engines |
| DE19736135C1 (en) * | 1997-08-20 | 1998-10-29 | Daimler Benz Ag | Liquid cooled piston for internal combustion engine |
| DE19810937C1 (en) | 1998-03-13 | 1999-11-25 | Daimler Chrysler Ag | Pistons for an internal combustion engine |
-
1999
- 1999-07-02 DE DE19930630A patent/DE19930630C1/en not_active Expired - Fee Related
-
2000
- 2000-06-19 BR BRPI0011981-4A patent/BR0011981B1/en not_active IP Right Cessation
- 2000-06-19 EP EP00949192A patent/EP1198667B1/en not_active Expired - Lifetime
- 2000-06-19 ES ES00949192T patent/ES2256023T3/en not_active Expired - Lifetime
- 2000-06-19 WO PCT/EP2000/005633 patent/WO2001002713A1/en active IP Right Grant
- 2000-06-19 DE DE50012199T patent/DE50012199D1/en not_active Expired - Lifetime
- 2000-06-19 JP JP2001507923A patent/JP2003526755A/en active Pending
- 2000-06-19 AT AT00949192T patent/ATE317497T1/en not_active IP Right Cessation
- 2000-06-19 PL PL353177A patent/PL198900B1/en not_active IP Right Cessation
-
2001
- 2001-12-27 US US10/032,527 patent/US6499386B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016004699A1 (en) | 2016-04-16 | 2016-12-22 | Daimler Ag | Piston for a reciprocating engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19930630C1 (en) | 2000-10-26 |
| DE50012199D1 (en) | 2006-04-20 |
| BR0011981A (en) | 2002-03-19 |
| ES2256023T3 (en) | 2006-07-16 |
| WO2001002713A1 (en) | 2001-01-11 |
| ATE317497T1 (en) | 2006-02-15 |
| EP1198667A1 (en) | 2002-04-24 |
| PL198900B1 (en) | 2008-07-31 |
| US20020162448A1 (en) | 2002-11-07 |
| PL353177A1 (en) | 2003-11-03 |
| US6499386B2 (en) | 2002-12-31 |
| JP2003526755A (en) | 2003-09-09 |
| BR0011981B1 (en) | 2010-07-27 |
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