EP2783096A1 - Piston for an internal combustion engine - Google Patents

Piston for an internal combustion engine

Info

Publication number
EP2783096A1
EP2783096A1 EP12778205.0A EP12778205A EP2783096A1 EP 2783096 A1 EP2783096 A1 EP 2783096A1 EP 12778205 A EP12778205 A EP 12778205A EP 2783096 A1 EP2783096 A1 EP 2783096A1
Authority
EP
European Patent Office
Prior art keywords
piston
ratio
shaft
shaft elements
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12778205.0A
Other languages
German (de)
French (fr)
Inventor
Markus Alexander HIRSCH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2783096A1 publication Critical patent/EP2783096A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02F3/0069—Multi-part pistons the crown and skirt being interconnected by the gudgeon pin
    • 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 
    • 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 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion

Definitions

  • the invention relates to a piston for an internal combustion engine with a piston head, to which a ring section and a piston shaft connect radially outside, wherein the piston shaft consists of two opposing shaft elements which adjoin pin hubs, each with a pin bore.
  • a piston of the type mentioned is known from the published patent application DE 4326978.
  • the disadvantage here is that the shaft elements are formed very solid in the region of the ring part, so that arise at a temperature-related, radial expansion of the piston between the cylinder wall and piston shaft stresses that increase the pressure of the shaft elements on the cylinder inner wall, thus increasing the friction losses and as a result of which increase the CO2 emission of the engine equipped with the known piston.
  • the shaft elements have inner surfaces which define radially inwardly those regions of the shaft elements in which the shaft elements are thinner than 7% of the piston diameter "D", that the shaft elements have outer surfaces that those areas of the shaft elements bounded radially outwardly, which lie in the circumferential direction outside of both sides of the pin bore axis lying angular ranges, the angular ranges of the pin bore axis and perpendicular to the piston axis and the pin bore axis intersecting straight lines, which are viewed in the circumferential direction on both sides of the pin bore axis, and each make an angle of more than 40 ° with the pin bore axis, and that the ratio of the contents of the inner surfaces to the ratio of the contents of the outer surfaces is more than 60%.
  • FIG. 1 is a perspective view of a piston for a diesel engine according to the invention
  • Fig. 2 is a section through the piston of FIG. 1 along a plane which
  • Fig. 3 is a side view of the piston with a representation of the outer surface
  • Fig. 4 is an interior view of the shaft member.
  • Fig. 1 and Fig. 2 show a piston 1 for a diesel engine made of aluminum, in the piston head 2, a combustion bowl 3 and four valve pockets 4, 4 ', 4 ", 4"' are formed. Radially outside close to the piston head 2, a top land 5, a ring section 6 and a piston shaft 7 at.
  • the piston skirt 7 consists of two opposite shaft elements 8 and 9 which adjoin pin bosses 10, 11, each with a pin bore 12, 13. Can be seen in Fig. 1, the outer surface 14 of the shaft member. 8
  • FIG. 1 Shown in FIG. 1 are lines 21, 21 'serving as auxiliary lines, which are perpendicular to the piston axis 16 and intersect the pin bore axis 15, which are arranged on both sides of the pin bore axis 15 in the circumferential direction. and the angular regions 20 lying on both sides of the pin bore axis 15,
  • FIG. 2 shows the piston 1 in section along a plane which is perpendicular to the pin bore axis 15 and on the piston axis 16.
  • the shaft elements 8, 9, which are shown in section, have a cross-section whose radial diameter decreases towards the lower end facing away from the piston bottom.
  • the thickness "S” is the shaft members 8 and 9
  • the maximum thickness "S" of the shaft elements 8, 9 in the area of the inner surfaces 17, 18 must be less than 7% of the piston diameter "D".
  • a side view of the piston 1 shows the outer surface 14 of the shaft member 8, while Fig. 4 shows the inner surface 17 of the shaft member 8, wherein the surface 17 is equivalent to the region of the shaft member 8, in which the shaft member Thinner than 7% of the piston diameter "D.”
  • the ratio of the content of the surface 17 to the content of the surface 14 is more than 60%, preferably between 65% and 78%, which also means the ratio of the content of the inner surface 18 to the content
  • the size ratio of the inner surface 17, 18 to the outer surface 14, 19 of the shaft elements according to the invention is accordingly to be found in the shaft element of the pressure side and in the shaft element of the counter pressure side or in both shaft elements.
  • the outer surfaces 14, 19 of the shaft elements 8, 9 on the wall of a cylinder liner of an internal combustion engine which in the engine operation due to the greater radial thermal expansion of the piston 1 with respect to the opposite lower, radial thermal expansion of a ferrous material existing cylinder bushing in the shaft elements 8, 9 give contact forces, so that the shaft elements 8, 9 with increasing heating be pressed with increasing force on their outer surfaces 14, 19 on the inner surface of the cylinder liner, which increases the friction losses of the piston 1 in engine operation and thus the CO 2 emissions of the engine.
  • the shaft elements are dimensioned as described above, which causes the shaft elements are designed to be more elastic, so that they give way at the temperature-induced expansion of the piston, whereby the force, with the press the shaft elements on the cylinder inner surface, so that the friction losses in engine operation and thus ultimately the CO 2 emissions of the engine can be reduced.
  • the piston shape is designed so that the hard shaft part, whose thickness is greater than 7% of the piston diameter, so much clearance is given that this game is sufficient so that this area of the hard shaft part experiences no direct compressive stresses on the contact between the piston and cylinder when the piston expands due to temperature.
  • the soft shaft part must be at least 60% of the entire shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention relates to a piston (1) for an internal combustion engine having shaft elements (8, 9) which have inner surfaces (17, 18) that correspond to those regions of the shaft elements (8, 9) in which the shaft elements (8, 9) are thinner than 7% of the piston diameter "D", and have outer surfaces (14, 19) that define in a radially outward direction those regions of the shaft elements (8, 9) which, viewed in the circumferential direction, lie outside angle ranges (20, 20') of more than 40° on both sides of the pin bore axis (15). In this connection, the ratio of the content of the inner surface (17, 18) to the ratio of the content of the outer surface (14, 19) is more than 60%. The shaft elements hereby become elastically compliant, which upon a temperature-induced radial expansion of the piston shaft reduces the pressure that the shaft elements exert on the cylindrical inner wall, whereby the friction losses of the piston, and hence the CO2 emission of the engine fitted with the piston according to the invention, are reduced.

Description

Kolben für einen Verbrennungsmotor  Piston for an internal combustion engine
Die Erfindung betrifft einen Kolben für einen Verbrennungsmotor mit einem Kolbenboden, an den sich radial außen eine Ringpartie und ein Kolbenschaft anschließen, wobei der Kolbenschaft aus zwei einander gegenüberliegenden Schaftelementen besteht, die an Bolzennaben mit je einer Bolzenbohrung angrenzen. The invention relates to a piston for an internal combustion engine with a piston head, to which a ring section and a piston shaft connect radially outside, wherein the piston shaft consists of two opposing shaft elements which adjoin pin hubs, each with a pin bore.
Ein Kolben der eingangs genannten Art ist aus der Offenlegungsschrift DE 4326978 bekannt. Nachteilig ist hierbei, dass die Schaftelemente in Bereich der Ringpartie sehr massiv ausgebildet sind, sodass sich bei einer temperaturbedingten, radialen Ausdehnung des Kolbens zwischen Zylinderwand und Kolbenschaft Spannungen ergeben, die den Druck der Schaftelemente auf die Zylinderinnenwand erhöhen, damit die Reibleistungsverluste vergrößern und als Folge davon den CO2-Ausstoß des mit dem bekannten Kolben ausgerüsteten Motors vergrößern. A piston of the type mentioned is known from the published patent application DE 4326978. The disadvantage here is that the shaft elements are formed very solid in the region of the ring part, so that arise at a temperature-related, radial expansion of the piston between the cylinder wall and piston shaft stresses that increase the pressure of the shaft elements on the cylinder inner wall, thus increasing the friction losses and as a result of which increase the CO2 emission of the engine equipped with the known piston.
Diese Nachteile des Standes der Technik zu vermeiden und einen Kolben mit verringertem CO2-Ausstoß zu schaffen, ist Aufgabe der Erfindung. To avoid these disadvantages of the prior art and to provide a piston with reduced CO2 emissions, is an object of the invention.
Gelöst wird die Aufgabe dadurch, dass die Schaftelemente innere Flächen aufweisen, die diejenigen Bereiche der Schaftelemente nach radial innen begrenzen, in denen die Schaftelemente dünner als 7 % des Kolbendurchmessers„D" sind, dass die Schaftelemente äußere Flächen aufweisen, die diejenigen Bereiche der Schaftelemente nach radial außen begrenzen, die in Umfangsrichtung betrachtet außerhalb von beidseitig der Bolzenbohrungsachse liegenden Winkelbereichen liegen, wobei die Winkelbereiche von der Bolzenbohrungsachse und von senkrecht auf der Kolbenachse stehenden und die Bolzenbohrungsachse schneidenden Geraden begrenzt werden, die in Umfangsrichtung betrachtet beidseitig der Bolzenbohrungsachse liegen, und die jeweils einen Winkel von mehr als 40° mit der Bolzenbohrungsachse bilden, und dass das Verhältnis der Inhalte der inneren Flächen zum Verhältnis der Inhalte der äußeren Flächen mehr als 60 % beträgt. Hierdurch wird erreicht, dass die Schaftelemente insoweit elastisch nachgiebig ausgebildet sind, dass sie bei einer temperaturbedingten, radialen Ausdehnung des Kolbens nachgeben, wodurch der Druck der Schaftelemente auf die Zylinderinnenwand, die Reibleistungsverluste im Motorbetrieb und damit auch der CO2-Ausstoß des mit dem erfindungsgemäßen Kolbens ausgerüsteten Motors abnehmen. The object is achieved in that the shaft elements have inner surfaces which define radially inwardly those regions of the shaft elements in which the shaft elements are thinner than 7% of the piston diameter "D", that the shaft elements have outer surfaces that those areas of the shaft elements bounded radially outwardly, which lie in the circumferential direction outside of both sides of the pin bore axis lying angular ranges, the angular ranges of the pin bore axis and perpendicular to the piston axis and the pin bore axis intersecting straight lines, which are viewed in the circumferential direction on both sides of the pin bore axis, and each make an angle of more than 40 ° with the pin bore axis, and that the ratio of the contents of the inner surfaces to the ratio of the contents of the outer surfaces is more than 60%. This ensures that the shaft elements are so far elastically yielding that they yield at a temperature-induced radial expansion of the piston, whereby the pressure of the shaft elements on the cylinder inner wall, the friction losses in engine operation and thus the CO2 emissions of the piston according to the invention remove the equipped engine.
Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche. Advantageous embodiments of the invention are the subject of the dependent claims.
Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1 die perspektivische Darstellung eines Kolben für einen Dieselmotor gemäß der Erfindung, 1 is a perspective view of a piston for a diesel engine according to the invention,
Fig. 2 einen Schnitt durch den Kolben gemäß Fig. 1 entlang einer Ebene, die Fig. 2 is a section through the piston of FIG. 1 along a plane which
senkrecht zur der Bolzenbohrungsachse und auf der Kolbenachse liegt,  is perpendicular to the pin bore axis and on the piston axis,
Fig. 3 eine Seitenansicht des Kolbens mit einer Darstellung der äußeren Fläche Fig. 3 is a side view of the piston with a representation of the outer surface
eines Schaftelements und  a shaft member and
Fig. 4 eine Innenansicht des Schaftelements. Fig. 4 is an interior view of the shaft member.
Fig. 1 und Fig. 2 zeigen einen Kolben 1 für einen Dieselmotor aus Aluminium, in dessen Kolbenboden 2 eine Verbrennungsmulde 3 und vier Ventiltaschen 4, 4', 4", 4"' eingeformt sind. Radial außen schließen sich an den Kolbenboden 2 ein Feuersteg 5, eine Ringpartie 6 und ein Kolbenschaft 7 an. Der Kolbenschaft 7 besteht aus zwei einander gegenüberliegenden Schaftelementen 8 und 9, die an Bolzennaben 10, 11 mit je einer Bolzenbohrungen 12, 13 angrenzen. Gut erkennbar ist in Fig. 1 die äußere Fläche 14 des Schaftelements 8. Fig. 1 and Fig. 2 show a piston 1 for a diesel engine made of aluminum, in the piston head 2, a combustion bowl 3 and four valve pockets 4, 4 ', 4 ", 4"' are formed. Radially outside close to the piston head 2, a top land 5, a ring section 6 and a piston shaft 7 at. The piston skirt 7 consists of two opposite shaft elements 8 and 9 which adjoin pin bosses 10, 11, each with a pin bore 12, 13. Can be seen in Fig. 1, the outer surface 14 of the shaft member. 8
Eingezeichnet sind in Fig. 1 als Hilfslinien dienende Geraden 21 , 21', die senkrecht auf der Kolbenachse 16 stehen und die Bolzenbohrungsachse 15 schneiden, die in Umfangrichtung betrachtet beidseitig der Bolzenbohrungsachse 15 angeordnet sind, und die beidseitig der Bolzenbohrungsachse 15 liegende Winkelbereiche 20,Shown in FIG. 1 are lines 21, 21 'serving as auxiliary lines, which are perpendicular to the piston axis 16 and intersect the pin bore axis 15, which are arranged on both sides of the pin bore axis 15 in the circumferential direction. and the angular regions 20 lying on both sides of the pin bore axis 15,
20' begrenzen, die größer als 40 ° sind und den Bereichen der Bolzennaben 10, 11 entsprechen, die außerhalb der Schaftelemente 14, 19 liegen. Limit 20 ', which are greater than 40 ° and the areas of the pin bosses 10, 11, which lie outside the shaft members 14, 19.
Fig. 2 zeigt den Kolben 1 im Schnitt entlang einer Ebene, die senkrecht zur Bolzenbohrungsachse 15 und auf der Kolbenachse 16 liegt. Die im Schnitt dargestellten Schaftelemente 8, 9 weisen einen Querschnitt auf, dessen radialer Durchmesser zum unteren, kolbenbodenabgewandten Ende hin abnimmt. Am oberen Ende der inneren Flächen 17, 18 mit der Länge„H" der Schaftelemente 8 und 9, die der maximalen axialen Länge der inneren Flächen 17, 18 entspricht (siehe Fig. 4), beträgt die Dicke„S" der Schaftelemente 8 und 9 7% vom Kolbendurchmesser „D" und nimmt nach unten stetig ab. Die maximale Dicke„S" der Schaftelemente 8, 9 im Bereich der inneren Flächen 17, 18 muss hierbei kleiner als 7 % vom Kolbendurchmesser„D" sein. FIG. 2 shows the piston 1 in section along a plane which is perpendicular to the pin bore axis 15 and on the piston axis 16. The shaft elements 8, 9, which are shown in section, have a cross-section whose radial diameter decreases towards the lower end facing away from the piston bottom. At the upper end of the inner surfaces 17, 18 of length "H" of the shaft members 8 and 9 corresponding to the maximum axial length of the inner surfaces 17, 18 (see FIG. 4), the thickness "S" is the shaft members 8 and 9 The maximum thickness "S" of the shaft elements 8, 9 in the area of the inner surfaces 17, 18 must be less than 7% of the piston diameter "D".
Fig. 3, eine Seitenansicht des Kolbens 1 , zeigt die äußere Fläche 14 des Schaftelements 8, während Fig. 4 die innere Fläche 17 des Schaftelements 8 zeigt, wobei die Fläche 17 gleichbedeutend mit dem Bereich des Schaftelements 8 ist, in dem das Schaftelement 8 dünner als 7 % vom Kolbendurchmesser„D" ist. Das Verhältnis des Inhalts der Fläche 17 zum Inhalt der Fläche 14 liegt bei mehr als 60 % vorzugsweise zwischen 65 % und 78% , was auch für das Verhältnis des Inhalts der inneren Fläche 18 zum Inhalt der äußeren Fläche 19 des Schaftelements 9 gilt. Das erfindungsgemäße Größenverhältnis der inneren Fläche 17, 18 zur äußeren Fläche 14, 19 der Schaftelemente ist demzufolge beim Schaftelement der Druckseite als auch beim Schaftelement der Gegendruckseite beziehungsweise bei beiden Schaftelementen vorzufinden. Fig. 3, a side view of the piston 1, shows the outer surface 14 of the shaft member 8, while Fig. 4 shows the inner surface 17 of the shaft member 8, wherein the surface 17 is equivalent to the region of the shaft member 8, in which the shaft member Thinner than 7% of the piston diameter "D." The ratio of the content of the surface 17 to the content of the surface 14 is more than 60%, preferably between 65% and 78%, which also means the ratio of the content of the inner surface 18 to the content The size ratio of the inner surface 17, 18 to the outer surface 14, 19 of the shaft elements according to the invention is accordingly to be found in the shaft element of the pressure side and in the shaft element of the counter pressure side or in both shaft elements.
Im Motorbetrieb liegen insbesondere die äußeren Flächen 14, 19 der Schaftelemente 8, 9 an der Wand einer Zylinderbuchse eines Verbrennungsmotors an, wobei sich im Motorbetrieb wegen der größeren radialen, thermischen Ausdehnung des Kolbens 1 gegenüber der demgegenüber geringeren, radialen thermischen Ausdehnung der aus einem Eisenwerkstoff bestehenden Zylinderbuchse in den Schaftelementen 8, 9 Kontaktkräfte ergeben, sodass die Schaftelemente 8, 9 bei zunehmender Erwärmung mit wachsender Kraft über ihre äußeren Flächen 14, 19 auf die Innenfläche der Zylinderbuchse gepresst werden, was die Reibleistungsverluste des Kolbens 1 im Motorbetrieb und damit auch den CO2 -Ausstoß des Motors vergrößert. In engine operation, in particular, the outer surfaces 14, 19 of the shaft elements 8, 9 on the wall of a cylinder liner of an internal combustion engine, which in the engine operation due to the greater radial thermal expansion of the piston 1 with respect to the opposite lower, radial thermal expansion of a ferrous material existing cylinder bushing in the shaft elements 8, 9 give contact forces, so that the shaft elements 8, 9 with increasing heating be pressed with increasing force on their outer surfaces 14, 19 on the inner surface of the cylinder liner, which increases the friction losses of the piston 1 in engine operation and thus the CO 2 emissions of the engine.
Um diese Kraft und damit die Reibleistungsverluste und den CO2 -Ausstoß des Motors zu reduzieren, sind die Schaftelemente wie oben beschrieben dimensioniert, was bewirkt, dass die Schaftelemente elastischer gestaltet sind, sodass sie bei der temperaturbedingten Ausdehnung des Kolbens nachgeben, wodurch die Kraft, mit der die Schaftelemente auf die Zylinderinnenfläche drücken, damit die Reibleistungsverluste im Motorbetrieb und damit letztlich auch der CO2-Ausstoß des Verbrennungsmotors reduziert werden. To reduce this force and thus the friction losses and the CO 2 emissions of the engine, the shaft elements are dimensioned as described above, which causes the shaft elements are designed to be more elastic, so that they give way at the temperature-induced expansion of the piston, whereby the force, with the press the shaft elements on the cylinder inner surface, so that the friction losses in engine operation and thus ultimately the CO 2 emissions of the engine can be reduced.
Hierbei ist darauf zu achten, dass die Führung des Kolbens im Zylinder nicht in Mitleidenschaft gezogen wird, weshalb die auf der Basis der oben beschriebenen Bemessungsgrundlage geschaffenen, elastisch nachgiebigen Bereiche der Schaftelemente nicht zu groß sind. It is important to ensure that the leadership of the piston in the cylinder is not affected, which is why the created on the basis of the basis described above, elastically yielding areas of the shaft elements are not too large.
Allgemein wird die Kolbenform so gestaltet, dass dem harten Schaftteil, dessen Dicke größer als 7 % des Kolbendurchmessers ist, so viel Spiel eingeräumt wird, dass dieses Spiel ausreicht, damit dieser Bereich des harten Schaftteils keine direkten Druckspannungen über den Kontakt zwischen Kolbens und Zylinder erfährt, wenn sich der Kolben temperaturbedingt ausdehnt. Generally, the piston shape is designed so that the hard shaft part, whose thickness is greater than 7% of the piston diameter, so much clearance is given that this game is sufficient so that this area of the hard shaft part experiences no direct compressive stresses on the contact between the piston and cylinder when the piston expands due to temperature.
Um darüber hinaus die Führung des Kolbens im Zylinder zu gewährleisten, muss der weiche Schaftteil mindestens 60 % des gesamten Schaftes betragen. In addition, to ensure the guidance of the piston in the cylinder, the soft shaft part must be at least 60% of the entire shaft.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
H, D, S Maß  H, D, S measure
1 Kolben  1 piston
2 Kolbenboden  2 piston bottom
3 Verbrennungsmulde  3 combustion bowl
4, 4', 4", 4"' Ventiltasche 4, 4 ', 4 ", 4"' valve bag
5 Feuersteg  5 lancet
6 Ringpartie  6 ring lot
7 Kolbenschaft  7 piston shaft
8, 9 Schaftelement 8, 9 shaft element
10, 11 Bolzennabe 10, 11 pin hub
12, 13 Bolzenbohrung 12, 13 Bolt hole
14 äußere Fläche des Schaftelements 8 14 outer surface of the shaft member. 8
15 Bolzenbohrungsachse 15 Bolt hole axis
16 Kolbenachse  16 piston axis
17 innere Fläche des Schaftelements 8 17 inner surface of the shaft member. 8
18 innere Fläche des Schaftelements 918 inner surface of the shaft element 9
19 äußere Fläche des Schaftelements 919 outer surface of the shaft member 9
20, 20' Winkelbereich 20, 20 'angle range
21 , 21' Gerade  21, 21 'Straight

Claims

Patentansprüche claims
1. Kolben (1 ) für einen Verbrennungsmotor mit einem Kolbenboden (2), an den sich radial außen eine Ringpartie (6) und ein Kolbenschaft (7) anschließen, wobei der Kolbenschaft (7) aus zwei einander gegenüberliegenden Schaftelementen (8, 9) besteht, die an Bolzennaben (10, 11) mit je einer Bolzenbohrung (12, 13) angrenzen, 1. Piston (1) for an internal combustion engine with a piston head (2), to which a ring section (6) and a piston shaft (7) adjoin radially on the outside, the piston shaft (7) consisting of two mutually opposite shaft elements (8, 9) consists of pin bosses (10, 11) each with a pin bore (12, 13) adjacent,
dadurch gekennzeichnet, dass die Schaftelemente (8, 9) innere Flächen (17, characterized in that the shaft elements (8, 9) have inner surfaces (17,
18) aufweisen, die diejenigen Bereiche der Schaftelemente (8, 9) nach radial innen begrenzen, in denen die Schaftelemente (8, 9) dünner als 7 % des Kolbendurchmessers„D" sind, dass die Schaftelemente (8, 9) äußere Flächen (14,18) which radially inwardly delimit those regions of the shaft elements (8, 9) in which the shaft elements (8, 9) are thinner than 7% of the piston diameter "D" in that the shaft elements (8, 9) have outer surfaces (FIGS. 14
19) aufweisen, die diejenigen Bereiche der Schaftelemente (8, 9) nach radial außen begrenzen, die in Umfangsrichtung betrachtet außerhalb von beidseitig der Bolzenbohrungsachse (15) liegenden Winkelbereichen (20, 20') liegen, wobei die Winkelbereiche (20, 20') von der Bolzenbohrungsachse (15) und von senkrecht auf der Kolbenachse (16) stehenden und die Bolzenbohrungsachse (15) schneidenden Geraden (21 , 21') begrenzt werden, die in Umfangsrichtung betrachtet beidseitig der Bolzenbohrungsachse (15) liegen, und die jeweils einen Winkel von mehr als 40° mit der Bolzenbohrungsachse (15) bilden, und dass das Verhältnis der Inhalte der inneren Flächen (17, 18) zum Verhältnis der Inhalte der äußeren Flächen (14, 19) mehr als 60 % beträgt. 19) which radially outwardly delimit those areas of the shaft elements (8, 9) which, viewed in the circumferential direction, lie outside of angular areas (20, 20 ') located on both sides of the pin bore axis (15), the angular areas (20, 20') being of the pin bore axis (15) and perpendicular to the piston axis (16) standing and the pin bore axis (15) intersecting straight lines (21, 21 ') are limited, which viewed in the circumferential direction on both sides of the pin bore axis (15), and each having an angle of more than 40 ° with the pin bore axis (15), and that the ratio of the contents of the inner surfaces (17, 18) to the ratio of the contents of the outer surfaces (14, 19) is more than 60%.
2. Kolben (1) für einen Verbrennungsmotor nach Anspruch 1 , dadurch gekennzeichnet, dass das Verhältnis des Inhalts der inneren Flächen (17, 18) zum Verhältnis des Inhalts der äußeren Flächen (14, 19) mehr als 65 % beträgt. A piston (1) for an internal combustion engine according to claim 1, characterized in that the ratio of the contents of the inner surfaces (17, 18) to the ratio of the contents of the outer surfaces (14, 19) is more than 65%.
3. Kolben (1) für einen Verbrennungsmotor nach Anspruch 1 , dadurch gekennzeichnet, dass das Verhältnis des Inhalts der inneren Flächen (17, 18) zum Verhältnis des Inhalts der äußeren Flächen (14, 19) mehr als 72 % beträgt. A piston (1) for an internal combustion engine according to claim 1, characterized in that the ratio of the contents of the inner surfaces (17, 18) to the ratio of the contents of the outer surfaces (14, 19) is more than 72%.
4. Kolben (1 ) für einen Verbrennungsmotor nach Anspruch 1 , dadurch gekennzeichnet, dass das Verhältnis des Inhalts der inneren Flächen (17, 18) zum Verhältnis des Inhalts der äußeren Flächen (14, 19) mehr als 78 % beträgt. 4. A piston (1) for an internal combustion engine according to claim 1, characterized in that the ratio of the content of the inner surfaces (17, 18) to the ratio of the content of the outer surfaces (14, 19) is more than 78%.
5. Kolben (1) für einen Verbrennungsmotor nach einem der vorhergehenden5. piston (1) for an internal combustion engine according to one of the preceding
Ansprüche, dadurch gekennzeichnet, dass der Kolben (1) aus Aluminium besteht. Claims, characterized in that the piston (1) consists of aluminum.
6. Verwendung des Kolbens (1) nach einem der vorhergehenden Ansprüche in einem Dieselmotor, wobei das Verhältnis des Durchmessers des Kolbenbolzens zum Durchmesser des Zylinders größer als 0,25 ist, und wobei das Verhältnis der Kompressionshöhe zum Durchmesser des Zylinders zwischen 0,45 und 0,7 liegt. 6. The use of the piston (1) according to one of the preceding claims in a diesel engine, wherein the ratio of the diameter of the piston pin to the diameter of the cylinder is greater than 0.25, and wherein the ratio of the compression height to the diameter of the cylinder between 0.45 and 0.7 is.
EP12778205.0A 2011-09-28 2012-09-14 Piston for an internal combustion engine Withdrawn EP2783096A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011115639A DE102011115639A1 (en) 2011-09-28 2011-09-28 Piston for an internal combustion engine
PCT/DE2012/000920 WO2013044897A1 (en) 2011-09-28 2012-09-14 Piston for an internal combustion engine

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EP2783096A1 true EP2783096A1 (en) 2014-10-01

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EP12778205.0A Withdrawn EP2783096A1 (en) 2011-09-28 2012-09-14 Piston for an internal combustion engine

Country Status (7)

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US (1) US9243583B2 (en)
EP (1) EP2783096A1 (en)
JP (1) JP2014532137A (en)
CN (1) CN103890362A (en)
BR (1) BR112014007441A2 (en)
DE (1) DE102011115639A1 (en)
WO (1) WO2013044897A1 (en)

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Also Published As

Publication number Publication date
JP2014532137A (en) 2014-12-04
DE102011115639A1 (en) 2013-03-28
BR112014007441A2 (en) 2017-04-04
US9243583B2 (en) 2016-01-26
CN103890362A (en) 2014-06-25
WO2013044897A1 (en) 2013-04-04
US20140238333A1 (en) 2014-08-28

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