EP3371443B1 - Optimized hub support - Google Patents

Optimized hub support Download PDF

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Publication number
EP3371443B1
EP3371443B1 EP16790990.2A EP16790990A EP3371443B1 EP 3371443 B1 EP3371443 B1 EP 3371443B1 EP 16790990 A EP16790990 A EP 16790990A EP 3371443 B1 EP3371443 B1 EP 3371443B1
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EP
European Patent Office
Prior art keywords
recess
piston
web
inner region
pin bore
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EP16790990.2A
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German (de)
French (fr)
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EP3371443A1 (en
Inventor
Matthias Laqua
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KS Kolbenschmidt GmbH
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KS Kolbenschmidt GmbH
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Publication of EP3371443A1 publication Critical patent/EP3371443A1/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

Definitions

  • the invention relates to a piston, assembled from an upper part having a cooling channel and a lower part having a bolt bore, wherein the upper part and the lower part have contact surfaces facing each other and the two parts are held together by means of at least one screw connection, according to the features of the preamble of patent claim 1.
  • Such assembled pistons also referred to as large pistons, are known.
  • An upper part of such a piston is manufactured separately from a lower part of the piston using the same or different processes and from the same or different materials, and the two parts are brought together via their mutually facing contact surfaces, with the permanent connection of both parts being achieved by means of at least one screw connection.
  • pistons are used in internal combustion engines, for example for locomotives, ships and the like, and have very large dimensions compared to pistons for internal combustion engines in passenger cars, for example. Accordingly, not only is the load high, but also the weight due to the size of the piston.
  • a piston is made of DE102006055251 known.
  • the invention is therefore based on the object of providing a piston, in particular a large piston, for internal combustion engines, in which the weight is reduced while maintaining the necessary strength to meet the requirements in the internal combustion engine.
  • the lower part has a recess directed towards an outer circumference, starting from its inner region above an apex of the pin bore, and at least one web, also pointing towards the outer circumference, above the pin bore, starting from an outer region.
  • material is deliberately removed from a particular location in the inner region of this piston in order to save weight. This removal of material takes place at locations where the loads on the piston are reduced during operation of the internal combustion engine as a result of the combustion pressures.
  • material is removed from the inner region of the piston in pistons where the upper part has a support surface for the lower part and the lower part has a corresponding support surface for the upper part.
  • the invention further provides that a web is also provided in the direction of the outer circumference above the pin bore. This at least one web, which runs parallel to the piston stroke axis, directly supports the underside of the upper part.
  • the lower part is provided with a circumferential web on its upper edge, to which the web arranged above the apex of the pin bore is arranged perpendicularly.
  • the weight is thus reduced by reducing the material by realizing the recess in the inner region of the lower part of the piston and at the same time the strength is increased by a web on the outside above the pin bore.
  • At least one recess is made in the lower part in addition to the at least one web.
  • Such a further recess has the advantage that material is removed at points around the bolt hole (bolt hub) that do not weaken the strength of the lower part or do not weaken it significantly.
  • the combination of web and recess next to the web means that further material can be reduced while maintaining the required strength.
  • the recess in the inner region of the piston extends over a rounded area into the inner region of the lower part. This effectively prevents sharp-edged transitions from the inner region into the recess, so that cracks in these areas are also effectively prevented when the piston is operating in the internal combustion engine.
  • a single web is provided above the apex of the pin bore. While it is alternatively conceivable to provide, for example, two webs running parallel to one another and spaced apart, a single web is particularly advantageous because, on the one hand, it ensures the required support of the upper part precisely in the area in which its greatest deformation occurs and, in addition, does not increase the additional weight compared to a piston without such a web in order to achieve the weight reduction through the recess in the inner area of the lower part of the piston.
  • the upper part has a through-opening in its interior above the recess in the direction of an inner region located inside the upper part. Cooling oil can be injected into this inner region inside the upper part through this through-opening. It is also conceivable that a connection to this inner region inside the upper part is created from the cooling channel in order to create an exchange of cooling oil between the circumferential ring-shaped cooling channel located behind a ring field and the inner region inside the upper part.
  • the recess in the inner area of the lower part merges into this passage opening, preferably in a rounded manner, in order to further save material and avoid cracking.
  • the piston 1 has an upper part 2 and a lower part 3.
  • the upper part 2 is designed in a manner known per se and has at least one ring field (here with three ring grooves), as well as, for example, a combustion chamber bowl, valve pockets and the like.
  • a cooling channel 4 is created, for which the two parts 2, 3 have corresponding ring-shaped recesses that are open at the bottom and at the top.
  • 5 designates an inner region that is also created by assembling the two parts 2, 3.
  • the lower part 3 has a pin bore 6 (with a pin hub surrounding it, not designated in more detail).
  • a piston stroke axis 7 runs through the pin axis of the pin bore 6 (not designated in more detail), with 8 designating an upper vertex of the pin bore 6. Furthermore, the lower part 3 has a passage opening 9 directed in the direction of the inner region 5, as well as a piston shaft and further, known elements for realizing the function of the lower part 3 of the piston 1.
  • the lower part 3 has a recess 10 in its inner area, which is arranged above the apex 8 of the bolt hole 6.
  • the recess 10 extends from the inner region of the lower part 3 in the direction of the outer circumference of the piston 1, without creating an opening in the direction of the outer circumference.
  • the recess 10 has the advantageously shown shape, wherein the edge regions of the recess 10 merge into the inner region of the lower part 3 via a rounded transition 11.
  • the upper part 2 is connected (screwed) to the lower part 3 by means of a screw connection 12.
  • the screw connection 12 in Figure 4 is only indicated for the sake of completeness, so that although not shown, there is a passage opening in the lower part 3 for a screw, which is passed through this opening from below and is screwed into a corresponding thread in the upper part 2.
  • This Screw connection 12 is present multiple times, at least twice, distributed around the circumference.
  • a web 13 corresponding to the recess 10 can be seen, which is also arranged above the apex 8 of the bolt hole +6.
  • This web 13 stands out from the surface of the bolt hub around the bolt hole 6.
  • a recess 14 is provided next to the web 13 (either only to the right or only to the left of it or on both sides).
  • the web 13 is rounded and merges into the base of the recess 14 or into the corresponding areas of the bolt hub.
  • the upper end of the web 13 can either be supported directly on the underside of the upper part 2, whereby in Figure 5
  • the lower part 3 has an arcuate web section at its upper end between the two side edges of the piston skirt, which is supported by the web 13. This arcuate web section between the two side edges of the piston skirts results in improved force introduction and force distribution from the upper part 2 into the lower part 3 via the at least one web 13.
  • FIG. 7 to 9 A first embodiment of the shape of the recess 10 is shown.
  • the position of the recess 10 in the lower part 3 is also clearly visible.
  • Figure 8 from which it can be seen that the recess 10 extends from the inner region of the lower part 3 towards the outer circumference of the piston 1 (when looking at the Figure 8 the right end of the hatched area).
  • a further embodiment of the recess 10 is shown in the Figures 10 to 12 shown.
  • the recess 10 merges into the inner area of the lower part 3 via a rounded transition 11.
  • a rounded transition 11 is also provided in the recess 10 according to Figure 7 to 9 intended.
  • Figure 14 shows the lower part 3 again in a three-dimensional representation, whereby in the upper part of this Figure 14 It is clearly visible that the lower part 3 has a shoulder which forms a support surface for the upper part 2.
  • pin bore is understood to mean a bore in the lower part 3, in each of which one end of a piston pin is arranged and the intermediate area accommodates the small connecting rod eye.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)

Description

Die Erfindung betrifft einen Kolben, zusammengebaut aus einem einen Kühlkanal aufweisenden Oberteil und einem eine Bolzenbohrung aufweisendes Unterteil, wobei das Oberteil und das Unterteil einander zugewandte Auflageflächen aufweisen und die beiden Teile mittels zumindest einer Schraubverbindung zusammengehalten werden, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a piston, assembled from an upper part having a cooling channel and a lower part having a bolt bore, wherein the upper part and the lower part have contact surfaces facing each other and the two parts are held together by means of at least one screw connection, according to the features of the preamble of patent claim 1.

Solche gebauten Kolben, auch als Großkolben bezeichnet, sind bekannt. Ein Oberteil eines solchen Kolbens wird separat von einem Unterteil des Kolbens ihm gleichen oder unterschiedlichen Verfahren sowie aus gleichen oder unterschiedlichen Materialien hergestellt und die beiden Teile über ihre einander zugewandten Auflageflächen zusammengebracht, wobei die dauerhafte Verbindung beider Teile mittels zumindest einer Schraubverbindung erfolgt.Such assembled pistons, also referred to as large pistons, are known. An upper part of such a piston is manufactured separately from a lower part of the piston using the same or different processes and from the same or different materials, and the two parts are brought together via their mutually facing contact surfaces, with the permanent connection of both parts being achieved by means of at least one screw connection.

Diese Kolben werden eingesetzt in Brennkraftmaschinen beispielsweise für Lokomotiven, Schiffe und dergleichen und weisen gegenüber Kolben beispielswiese für Brennkraftmaschinen von Personenkraftwagen sehr große Dimensionen auf. Dementsprechend hoch ist nicht nur die Belastung, sondern aufgrund der Größe des Kolbens auch das Gewicht. Ein solcher Kolben ist aus DE102006055251 bekannt.These pistons are used in internal combustion engines, for example for locomotives, ships and the like, and have very large dimensions compared to pistons for internal combustion engines in passenger cars, for example. Accordingly, not only is the load high, but also the weight due to the size of the piston. Such a piston is made of DE102006055251 known.

Der Erfindung liegt daher die Aufgabe zu Grunde, einen Kolben, insbesondere einen Großkolben, für Brennkraftmaschinen bereitzustellen, bei dem unter Beibehaltung der erforderlichen Festigkeit zur Erzielung der Anforderungen in der Brennkraftmaschine das Gewicht reduziert ist.The invention is therefore based on the object of providing a piston, in particular a large piston, for internal combustion engines, in which the weight is reduced while maintaining the necessary strength to meet the requirements in the internal combustion engine.

Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst.This problem is solved by the features of patent claim 1.

Erfindungsgemäß ist vorgesehen, dass das Unterteil ausgehend von seinem Innenbereich oberhalb eines Scheitelpunktes der Bolzenbohrung eine in Richtung eines Außenumfanges gerichtete Ausnehmung und ausgehend von einem Außenbereich zumindest einen ebenfalls in Richtung des Außenumfanges weisenden Steg oberhalb der Bolzenbohrung aufweist. Nach der Erfindung wird bei diesem Kolben in seinem Innenbereich gezielt an einer besonderen Stelle Material weggenommen, um Gewicht zu sparen. Diese Wegnahme von Material erfolgt an solchen Stellen, an denen die Belastungen des Kolbens im Betrieb der Brennkraftmaschine infolge der Verbrennungsdrücke herabgesetzt ist. Insbesondere erfolgt die Wegnahme von Material in dem Innenbereich des Kolbens bei Kolben, bei denen das Oberteil eine Auflagefläche für das Unterteil und das Unterteil eine korrespondierende Auflagefläche für das Oberteil aufweist. Es ist allerdings auch denkbar, dass mehr als eine, insbesondere umlaufende Auflagefläche vorhanden ist. Da das Unterteil infolge der Verformung des Oberteiles aufgrund der Verbrennungsdrücke durch die Ausnehmung (Wegnahme von Material) geschwächt wird, ist es nach der Erfindung weiterhin vorgesehen, dass ebenfalls in Richtung des Außenumfanges oberhalb der Bolzenbohrung ein Steg vorgesehen ist. Dieser parallel zu der Kolbenhubachse verlaufende zumindest eine Steg stützt die Unterseite des Oberteiles direkt ab. Alternativ dazu ist vorgesehen, dass Unterteil an seiner oberen Kante einen umlaufenden Steg aufweist, zu dem der oberhalb des Scheitelpunktes der Bolzenbohrung angeordnete Steg senkrecht dazu angeordnet ist.According to the invention, the lower part has a recess directed towards an outer circumference, starting from its inner region above an apex of the pin bore, and at least one web, also pointing towards the outer circumference, above the pin bore, starting from an outer region. According to the invention, material is deliberately removed from a particular location in the inner region of this piston in order to save weight. This removal of material takes place at locations where the loads on the piston are reduced during operation of the internal combustion engine as a result of the combustion pressures. In particular, material is removed from the inner region of the piston in pistons where the upper part has a support surface for the lower part and the lower part has a corresponding support surface for the upper part. However, it is also conceivable that there is more than one support surface, in particular a circumferential support surface. Since the lower part is weakened by the recess (removal of material) as a result of the deformation of the upper part due to the combustion pressures, the invention further provides that a web is also provided in the direction of the outer circumference above the pin bore. This at least one web, which runs parallel to the piston stroke axis, directly supports the underside of the upper part. Alternatively, the lower part is provided with a circumferential web on its upper edge, to which the web arranged above the apex of the pin bore is arranged perpendicularly.

Nach der Erfindung wird somit das Gewicht durch Reduzierung des Materials durch Realisierung der Ausnehmung in dem Innenbereich des Unterteiles des Kolbens reduziert und gleichzeitig die Festigkeit durch einen Steg auf der Außenseite oberhalb der Bolzenbohrung gesteigert.According to the invention, the weight is thus reduced by reducing the material by realizing the recess in the inner region of the lower part of the piston and at the same time the strength is increased by a web on the outside above the pin bore.

Erfindungsgemäß ist neben den zumindest einen Steg zumindest eine Ausnehmung in dem Unterteil eingebracht. Eine solche weitere Ausnehmung hat den Vorteil, dass an solchen Stellen um die Bolzenbohrung herum (Bolzennabe) Material weggenommen wird, durch die die Festigkeit des Unterteiles nicht oder nicht wesentlich geschwächt wird. Durch die Kombination von Steg und Ausnehmung neben dem Steg kann somit unter Beibehaltung der erforderlichen Festigkeit weiter Material reduziert werden.According to the invention, at least one recess is made in the lower part in addition to the at least one web. Such a further recess has the advantage that material is removed at points around the bolt hole (bolt hub) that do not weaken the strength of the lower part or do not weaken it significantly. The combination of web and recess next to the web means that further material can be reduced while maintaining the required strength.

Erfindungsgemäß geht die Ausnehmung in dem Innenbereich des Kolbens über einen gerundeten Bereich in den Innenbereich des Unterteiles über. Dadurch werden scharfkantige Übergänge von dem Innenbereich in die Ausnehmung wirksam vermieden, sodass dadurch auch Rissbildungen in diesen Bereichen im Betrieb des Kolbens in der Brennkraftmaschine wirksam vermieden werden.According to the invention, the recess in the inner region of the piston extends over a rounded area into the inner region of the lower part. This effectively prevents sharp-edged transitions from the inner region into the recess, so that cracks in these areas are also effectively prevented when the piston is operating in the internal combustion engine.

In Weiterbildung der Erfindung ist ein einziger Steg oberhalb des Scheitelpunktes der Bolzenbohrung vorgesehen. Während es alternativ dazu denkbar ist, beispielweise auch zwei parallel zueinander verlaufende und beabstandete Stege vorzusehen, ist ein einziger Steg von besonderem Vorteil, weil er zum Einen die erforderliche Abstützung des Oberteiles genau in dem Bereich, in dem seine größte Verformung erfolgt, gewährleistet und außerdem das zusätzliche Gewicht gegenüber einem Kolben ohne einen solchen Steg nicht erhöht, um die Gewichtsreduzierung durch die Ausnehmung in dem Innenbereich des Unterteiles des Kolbens zu erzielen.In a further development of the invention, a single web is provided above the apex of the pin bore. While it is alternatively conceivable to provide, for example, two webs running parallel to one another and spaced apart, a single web is particularly advantageous because, on the one hand, it ensures the required support of the upper part precisely in the area in which its greatest deformation occurs and, in addition, does not increase the additional weight compared to a piston without such a web in order to achieve the weight reduction through the recess in the inner area of the lower part of the piston.

In Weiterbildung der Erfindung weist das Oberteil oberhalb der Ausnehmung in seinem Inneberich eine Durchtrittsöffnung in Richtung eines Innerhalb des Oberteiles liegenden Innenbereiches auf. Durch diese Durchtrittsöffnung kann beispielsweise Kühlöl in diesen Innenbereich innerhalb des Oberteiles eingespritzt werden. Außerdem ist es denkbar, dass von dem Kühlkanal aus eine Verbindung zu diesem Innenbereich innerhalb des Oberteiles geschaffen ist, um einen Austausch von Kühlöl zwischen dem hinter einem Ringfeld liegenden umlaufenden ringförmigen Kühlkanal und dem Innenbereich innerhalb des Oberteiles zu schaffen. Auch hier ist es von Vorteil, wenn die Ausnehmung in dem Innenbereich des Unterteiles in diese Durchtrittsöffnung vorzugsweise gerundet übergeht, um weiterhin Material zu sparen und Rissbildungen zu vermeiden.In a further development of the invention, the upper part has a through-opening in its interior above the recess in the direction of an inner region located inside the upper part. Cooling oil can be injected into this inner region inside the upper part through this through-opening. It is also conceivable that a connection to this inner region inside the upper part is created from the cooling channel in order to create an exchange of cooling oil between the circumferential ring-shaped cooling channel located behind a ring field and the inner region inside the upper part. Here too, It is advantageous if the recess in the inner area of the lower part merges into this passage opening, preferably in a rounded manner, in order to further save material and avoid cracking.

Im Folgenden wird die Erfindung anhand der Figuren näher erläutert und weiter beschrieben.In the following, the invention is explained and described in more detail with reference to the figures.

In den Figuren 1 bis 6 ist ein Ausführungsbeispiel eines Kolbens 1 in verschiedenen Ansichten und Darstellungen (Strichdarstellung und dreidimensionale Darstellung) gezeigt. Der Kolben 1 weist ein Oberteil 2 und ein Unterteil 3 auf. Das Oberteil 2 ist in an sich bekannter Weise gestaltet und weist mindestens ein Ringfeld (hier mit drei Ringnuten) auf, genauso wie beispielsweise eine Brennraummulde, Ventiltaschen und dergleichen. Durch den Zusammenbau des Oberteiles 2 mit dem Unterteil 3 wird ein Kühlkanal 4 geschaffen, wozu die beiden Teile 2, 3 entsprechende ringförmige nach unten bzw. oben offene Ausnehmungen aufweisen. Mit 5 ist ein Innenbereich bezeichnet, der ebenfalls durch den Zusammenbau der beiden Teile 2, 3 entsteht. Das Unterteil 3 weist eine Bolzenbohrung 6 (mit darumliegender Bolzennabe, nicht näher bezeichnet) auf. Durch die nicht näher bezeichnete Bolzenachse der Bolzenbohrung 6 verläuft eine Kolbenhubachse 7, wobei mit 8 ein obenliegender Scheitelpunkt der Bolzenbohrung 6 bezeichnet ist. Weiterhin weist das Unterteil 3 eine in Richtung des Innenbereiches 5 gerichtete Durchtrittsöffnung 9 auf, genauso wie einen Kolbenschaft und weitere, an sich bekannte Elemente zur Realisierung der Funktion des Unterteiles 3 des Kolbens 1.In the Figures 1 to 6 an embodiment of a piston 1 is shown in various views and representations (line representation and three-dimensional representation). The piston 1 has an upper part 2 and a lower part 3. The upper part 2 is designed in a manner known per se and has at least one ring field (here with three ring grooves), as well as, for example, a combustion chamber bowl, valve pockets and the like. By assembling the upper part 2 with the lower part 3, a cooling channel 4 is created, for which the two parts 2, 3 have corresponding ring-shaped recesses that are open at the bottom and at the top. 5 designates an inner region that is also created by assembling the two parts 2, 3. The lower part 3 has a pin bore 6 (with a pin hub surrounding it, not designated in more detail). A piston stroke axis 7 runs through the pin axis of the pin bore 6 (not designated in more detail), with 8 designating an upper vertex of the pin bore 6. Furthermore, the lower part 3 has a passage opening 9 directed in the direction of the inner region 5, as well as a piston shaft and further, known elements for realizing the function of the lower part 3 of the piston 1.

Nach der Erfindung weist das Unterteil 3 in seinem Innenbereich eine Ausnehmung 10 auf, die oberhalb des Scheitelpunktes 8 der Bolzenbohrung 6 angeordnet ist. Wie in den Figuren 1 bis 4 sehr gut erkennbar ist, geht die Ausnehmung 10 ausgehend von dem Innenbereich des Unterteiles 3 in Richtung des Außenumfanges des Kolbens 1 aus, ohne eine Öffnung in Richtung des Außenumfanges zu schaffen. Bei dem Ausführungsbeispiel gemäß der Figuren 1 bis 6 weist die Ausnehmung 10 die in vorteilhafter Weise gezeigte Formgebung auf, wobei die Randbereiche der Ausnehmung 10 über einen gerundeten Übergang 11 in den Innenbereich des Unterteiles 3 übergehen.According to the invention, the lower part 3 has a recess 10 in its inner area, which is arranged above the apex 8 of the bolt hole 6. As shown in the Figures 1 to 4 As can be clearly seen, the recess 10 extends from the inner region of the lower part 3 in the direction of the outer circumference of the piston 1, without creating an opening in the direction of the outer circumference. In the embodiment according to the Figures 1 to 6 the recess 10 has the advantageously shown shape, wherein the edge regions of the recess 10 merge into the inner region of the lower part 3 via a rounded transition 11.

Mit Bezug auf Figur 4 ist noch darauf hinzuweisen, dass das Oberteil 2 mittels einer Schraubverbindung 12 mit dem Unterteil 3 verbunden (verschraubt) ist. Die Schraubverbindung 12 in Figur 4 ist der Vollständigkeit halber nur angedeutet, sodass zwar nicht gezeigt, aber vorhanden ist, eine Durchtrittsöffnung in dem Unterteil 3 für eine Schraube, die durch diese Öffnung von unten durchgeführt wird und in ein entsprechendes Gewinde in dem Oberteil 2 eingeschraubt wird. Diese Schraubverbindung 12 ist über den Umfang verteilt mehrfach, mindestens zweifach vorhanden.Regarding Figure 4 It should also be noted that the upper part 2 is connected (screwed) to the lower part 3 by means of a screw connection 12. The screw connection 12 in Figure 4 is only indicated for the sake of completeness, so that although not shown, there is a passage opening in the lower part 3 for a screw, which is passed through this opening from below and is screwed into a corresponding thread in the upper part 2. This Screw connection 12 is present multiple times, at least twice, distributed around the circumference.

In Figur 5 ist ein mit der Ausnehmung 10 korrespondierender Steg 13 erkennbar, der ebenfalls oberhalb des Scheitelpunktes 8 der Bolzenbohrung +6 angeordnet ist. Dieser Steg 13 hebt sich von der Oberfläche der Bolzennabe um die Bolzenbohrung 6 herum ab. Zur weiteren Gewichtsreduzierung ist neben dem Steg 13 (entweder nur rechts oder nur links davon oder beidseitig) eine Ausnehmung 14 vorgesehen. Zur Vermeidung von Rissbildungen geht der Steg 13 wiederum gerundet in den Grund der Ausnehmung 14 bzw. in die entsprechenden Bereiche der Bolzennabe über. Das obere Ende des Steges 13 kann sich entweder direkt auf der Unterseite des Oberteiles 2 abstützen, wobei in Figur 5 erkennbar ist, dass das Unterteil 3 an seinem oberen Ende zwischen den beiden seitenkanten des Kolbenschaftes einen bogenförmigen Stegabschnitt aufweist, der von dem Steg 13 unterstützt wird. Durch diesen bogenförmigen Stegabschnitt zwischen den beiden Seitenkanten der Kolbenschäfte erfolgt eine verbesserte Krafteinleitung und Kraftverteilung des Oberteiles 2 in das Unterteil 3 über den zumindest eine Steg 13.In Figure 5 a web 13 corresponding to the recess 10 can be seen, which is also arranged above the apex 8 of the bolt hole +6. This web 13 stands out from the surface of the bolt hub around the bolt hole 6. To further reduce weight, a recess 14 is provided next to the web 13 (either only to the right or only to the left of it or on both sides). To avoid cracks, the web 13 is rounded and merges into the base of the recess 14 or into the corresponding areas of the bolt hub. The upper end of the web 13 can either be supported directly on the underside of the upper part 2, whereby in Figure 5 It can be seen that the lower part 3 has an arcuate web section at its upper end between the two side edges of the piston skirt, which is supported by the web 13. This arcuate web section between the two side edges of the piston skirts results in improved force introduction and force distribution from the upper part 2 into the lower part 3 via the at least one web 13.

In den Figuren 7 bis 9 ist ein erstes Ausführungsbeispiel für die Form der Ausnehmung 10 gezeigt. Sehr gut ist dabei auch die Lage der Ausnehmung 10 in dem Unterteil 3 erkennbar. Insbesondere wird auf Figur 8 hingewiesen, aus der erkennbar ist, dass sich die Ausnehmung 10 von dem Innenbereich der Unterteiles 3 in Richtung des Außenumfanges des Kolbens 1 (bei Betrachtung der Figur 8 das rechte Ende des schraffierten Bereiches) erstreckt.In the Figures 7 to 9 A first embodiment of the shape of the recess 10 is shown. The position of the recess 10 in the lower part 3 is also clearly visible. In particular, Figure 8 from which it can be seen that the recess 10 extends from the inner region of the lower part 3 towards the outer circumference of the piston 1 (when looking at the Figure 8 the right end of the hatched area).

Eine weitere Ausgestaltung der Ausnehmung 10 ist in den Figuren 10 bis 12 gezeigt.A further embodiment of the recess 10 is shown in the Figures 10 to 12 shown.

Hier ist vor allen Dingen erkennbar, dass die Ausnehmung 10 über einen gerundeten Übergang 11 in den Innenbereich des Unterteiles 3 übergeht.Here it is particularly noticeable that the recess 10 merges into the inner area of the lower part 3 via a rounded transition 11.

Selbstverständlich sind auch andere Formen der Ausnehmung 10, als wie sie beispielsweise in den Figuren 7 und 10 gezeigt sind, denkbar.Of course, other shapes of the recess 10 are also possible, as for example in the Figures 7 and 10 shown are conceivable.

Erfindungsgemäß ist ein gerundeter Übergang 11 auch bei der Ausnehmung 10 gemäß Figur 7 bis 9 vorgesehen.According to the invention, a rounded transition 11 is also provided in the recess 10 according to Figure 7 to 9 intended.

In den Figuren 13 und 14 ist das Zusammenspiel der Ausnehmung 10 und des Steges 13 sehr gut erkennbar. Insbesondere mit Blick auf Figur 13 wird deutlich, dass das Unterteil 3 ausgehend von seinem Innenbereich oberhalb des Scheitelpunktes 8 der Bolzenbohrung 6 die in Richtung eines Außenumfanges 15 gerichtete Ausnehmung 10 und ausgehend von einem Außenbereich (oberer Bereich der Bolzennabe) zumindest den ebenfalls in Richtung des Außenumfanges 15 weisenden Steg 13 oberhalb der Bolzenbohrung 6 aufweist. Ebenso ist sehr gut erkennbar, dass um den Steg herum 13 jeweils wieder eine Ausnehmung 14 vorgesehen ist.In the Figures 13 and 14 the interaction of the recess 10 and the web 13 is clearly visible. Especially with regard to Figure 13 it becomes clear that the lower part 3, starting from its inner region above the apex 8 of the bolt bore 6, has the recess 10 directed in the direction of an outer circumference 15 and, starting from an outer region (upper region of the bolt hub), at least the web 13 above the bolt bore 6, which also points in the direction of the outer circumference 15. It is also very clearly visible that a recess 14 is provided around the web 13.

Figur 14 zeigt noch einmal das Unterteil 3 in einer dreidimensionalen Darstellung, wobei in dem oberen Teil dieser Figur 14 sehr gut erkennbar ist, dass das Unterteil 3 einen Absatz aufweist, der eine Auflagefläche für das Oberteil 2 bildet. Figure 14 shows the lower part 3 again in a three-dimensional representation, whereby in the upper part of this Figure 14 It is clearly visible that the lower part 3 has a shoulder which forms a support surface for the upper part 2.

Der Vollständigkeit halber wird darauf hingewiesen, dass aufgrund der rotationssymmetrischen Gestaltung des Kolbens 1 die Ausnehmung 10 und der damit korrelierende Steg 13 nach der Erfindung (wie beispielsweise in Figur 13 dargestellt) jeweils spiegelbildlich auf beiden Seiten der Kolbenhubachse 7, d.h. zu jeder Bolzenbohrung 6, vorhanden ist. Das bedeutet, dass unter dem Begriff "Bolzenbohrung" jeweils eine Bohrung in dem Unterteil 3 verstanden wird, in die jeweils ein Ende eines Kolbenbolzens angeordnet wird und der Zwischenbereich das kleine Pleuelauge aufnimmt.For the sake of completeness, it is pointed out that due to the rotationally symmetrical design of the piston 1, the recess 10 and the web 13 corresponding thereto according to the invention (as for example in Figure 13 shown) is present in mirror image on both sides of the piston stroke axis 7, ie to each pin bore 6. This means that the term "pin bore" is understood to mean a bore in the lower part 3, in each of which one end of a piston pin is arranged and the intermediate area accommodates the small connecting rod eye.

BezugszeichenlisteList of reference symbols

  1. 1. Kolben1. Piston
  2. 2. Oberteil2. Top
  3. 3. Unterteil3. Lower part
  4. 4. Kühlkanal4. Cooling channel
  5. 5. Innenbereich5. Interior
  6. 6. Bolzenbohrung6. Bolt hole
  7. 7. Kolbenhubachse7. Piston stroke axis
  8. 8. Scheitelpunkt8. Vertex
  9. 9. Durchtrittsöffnung9. Passage opening
  10. 10. Ausnehmung10. Recess
  11. 11. Gerundeter Übergang11. Rounded transition
  12. 12. Schraubverbindung12. Screw connection
  13. 13. Steg13. Bridge
  14. 14. Ausnehmung14. Recess
  15. 15. Außenumfang15. Outer circumference

Claims (5)

  1. Piston (1), assembled from an upper part (2) comprising a cooling channel (4) and a lower part (3) comprising a pin bore (6), wherein the upper part (2) and the lower part (3) comprise bearing surfaces facing one another and the two parts (2, 3) are held together by means of at least one screw connection (12), wherein the lower part (3), starting from its inner region above an apex (8) of the pin bore (6), comprises a recess (10) directed in the direction of an outer circumference (15) and, starting from an outer region, comprises at least one web (13) above the pin bore (6), which at least one web (13) also points in the direction of the outer circumference (15), characterized in that the recess (10) merges into the inner region of the lower part (3) via a rounded transition (11).
  2. Piston (1) according to claim 1, characterized in that a single web (13) is provided above the apex (8) of the pin bore (6).
  3. Piston (1) according to claim 1 or 2, characterized in that at least one recess (14) is provided in the lower part (3) next to the at least one web (13).
  4. Piston (1) according to one of the preceding claims, characterized in that the lower part (3) comprises a passage opening (9) above the recess (10) in the direction of an inner region (5) located inside the upper part (2).
  5. Piston (1) according to claim 4, characterized in that the recess (10) is rounded into the passage opening (9).
EP16790990.2A 2015-11-02 2016-11-02 Optimized hub support Active EP3371443B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015221370 2015-11-02
PCT/EP2016/076458 WO2017076920A1 (en) 2015-11-02 2016-11-02 Optimized hub support

Publications (2)

Publication Number Publication Date
EP3371443A1 EP3371443A1 (en) 2018-09-12
EP3371443B1 true EP3371443B1 (en) 2024-04-10

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EP16790990.2A Active EP3371443B1 (en) 2015-11-02 2016-11-02 Optimized hub support

Country Status (8)

Country Link
US (1) US10871125B2 (en)
EP (1) EP3371443B1 (en)
JP (1) JP6692424B2 (en)
KR (1) KR20180078251A (en)
CN (1) CN108271404B (en)
DE (1) DE102016120907A1 (en)
FI (1) FI3371443T3 (en)
WO (1) WO2017076920A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112019021016A2 (en) 2017-04-19 2020-05-05 Ks Kolbenschmidt Gmbh piston in structural construction
CN111512036A (en) 2017-11-14 2020-08-07 Ks科尔本施密特有限公司 Optimally designed steel piston

Citations (1)

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GB268399A (en) * 1925-10-07 1927-04-07 Adolph Lincoln Nelson Pistons

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DE2307347A1 (en) 1973-02-15 1974-08-22 Maschf Augsburg Nuernberg Ag MULTI-PIECE PLUNGER FOR FOUR-STROKE COMBUSTION MACHINES, IN PARTICULAR LARGE DIESEL ENGINES
DE2919638A1 (en) * 1979-05-16 1980-11-20 Schmidt Gmbh Karl PISTON FOR INTERNAL COMBUSTION ENGINES
JPS59168556U (en) 1983-04-27 1984-11-12 ヤンマーディーゼル株式会社 Combination piston structure
DE3842321A1 (en) * 1988-12-16 1990-06-21 Kolbenschmidt Ag PISTON WITH OIL COOLING FOR INTERNAL COMBUSTION ENGINES
ES2266011T3 (en) * 1999-10-08 2007-03-01 Federal-Mogul Corporation PISTON WITH DOUBLE GALLERY.
EP1242759B1 (en) * 1999-12-30 2008-12-17 Federal-Mogul Corporation Piston having uncoupled skirt
GB2366607B (en) * 2000-09-06 2004-06-09 Federal Mogul Bradford Ltd Piston for internal combustion engine
US6840155B2 (en) * 2000-10-18 2005-01-11 Federal-Mogul World Wide, Inc. Multi-axially forged piston
US7104183B2 (en) * 2004-07-07 2006-09-12 Karl Schmidt Unisia, Inc. One-piece steel piston
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DE102006055251A1 (en) * 2006-11-23 2008-05-29 Mahle International Gmbh Two-piece piston for an internal combustion engine
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Also Published As

Publication number Publication date
WO2017076920A1 (en) 2017-05-11
CN108271404A (en) 2018-07-10
US20180313293A1 (en) 2018-11-01
DE102016120907A1 (en) 2017-05-04
JP2018534470A (en) 2018-11-22
KR20180078251A (en) 2018-07-09
FI3371443T3 (en) 2024-07-17
JP6692424B2 (en) 2020-05-13
US10871125B2 (en) 2020-12-22
CN108271404B (en) 2021-07-20
EP3371443A1 (en) 2018-09-12

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