EP1678418B1 - One-piece piston for an internal combustion engine - Google Patents

One-piece piston for an internal combustion engine Download PDF

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Publication number
EP1678418B1
EP1678418B1 EP04789925.7A EP04789925A EP1678418B1 EP 1678418 B1 EP1678418 B1 EP 1678418B1 EP 04789925 A EP04789925 A EP 04789925A EP 1678418 B1 EP1678418 B1 EP 1678418B1
Authority
EP
European Patent Office
Prior art keywords
piston
ring
combustion engine
internal combustion
feed pipe
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.)
Ceased
Application number
EP04789925.7A
Other languages
German (de)
French (fr)
Other versions
EP1678418A1 (en
Inventor
Rainer Scharp
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 GmbH
Original Assignee
Mahle 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 GmbH filed Critical Mahle GmbH
Publication of EP1678418A1 publication Critical patent/EP1678418A1/en
Application granted granted Critical
Publication of EP1678418B1 publication Critical patent/EP1678418B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • 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 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons

Definitions

  • the invention relates to a one-piece piston for an internal combustion engine according to the preamble of claim 1.
  • the invention is based on the problem to provide an easy to install cooling duct cover for a one-piece piston of an internal combustion engine.
  • FIG. 1 shows a one-piece piston 1 for an internal combustion engine in a sectional view, which consists of two halves, of which the left half of a section of the piston 1 along a longitudinal axis 2 of a hub bore 3 and the right half offset by 90 ° thereto longitudinal section of the piston first represents.
  • the piston 1 is made of steel and has a combustion bowl 5 in the region of the piston head 4.
  • an annular circumferential cooling channel 6 is arranged, the radially outer boundary of an integrally formed on the piston head 4 ring wall 7 and its radially inner boundary part of an annular rib 8, partly from a hub support 9, 9 'and partly be formed by a shank connection 10, 10 '.
  • the annular wall 7 serves as a piston ring carrier.
  • a circumferential, nose-shaped projection 17 is mounted, the purpose of which is to serve as an abutment for a substantially cylindrical, one-piece ring 18, of which Cooling channel 6 is closed.
  • the ring 18 may be made of plastic or metal.
  • the annular wall 7 On the piston longitudinal axis 13 facing inner side 28, the annular wall 7 has a circumferential groove 19, in which a likewise circumferential and piston crown side integrally formed on the outside of the ring 18 collar 20 is inserted, whereby the ring 18 on the inside of the annular wall 7 can be fastened.
  • the ring 18 has a gap 22.
  • the assembly of the ring 18 can be done in a simple manner in that it is bent and in the region of the piston 1 between the annular wall 7 and shaft elements 14, 14 'is inserted. Following this, the ring 18 is compressed, so that its radius is reduced, wherein the shank side, lower edge of the ring 18 comes to rest on the projection 17. The fact that the piston bottom side, upper edge of the ring 18 is pressed a little more inward, it is then possible to insert the ring from below into the cooling channel 6 so far until the fixation of the ring 18 whose collar 20 into the groove 19 on the inside 28 of the annular wall 7 engages.
  • an oil feed tube 35 is inserted, which consists of a funnel 21 with a tubular upper part 27, and which spreads the ring 18 during insertion. This is how esp.
  • the FIGS. 4 and 5 show, with certainty ensured that the collar 20 of the ring 18 remains even with faster reciprocating movements of the piston 1 in the groove 19 on the inside of the annular wall 7.
  • the oil supply pipe 35 may be made of plastic or metal.
  • the oil supply pipe 35 becomes, as in Fig. 3 is attached to the piston 1 by a mounted on the upper part 27 nose 23 on the upper edge of a near the shaft 14, 14 'introduced opening 24 comes to rest after the Oil supply pipe 35 is inserted into the opening 24.
  • the upper part 27, like the Fig. 4, 5 and 7 show, on its the piston crown outer side facing a circumferential groove 25, in which when inserting the oil supply pipe 35 in the opening 24 on the inside of the ring 18 at its joints 29 and 30 integrally molded projections 26, 26 ', whereby the oil supply pipe 35 at Ring 18 is attached.

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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)

Description

Die Erfindung betrifft einen einteiligen Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1.The invention relates to a one-piece piston for an internal combustion engine according to the preamble of claim 1.

Aus der Offenlegungsschrift DE 40 39 751 A1 ist ein mehrteiliger gekühlter Kolben mit einen im Randbereich des Kolbenbodens angeordneten Kühlkanal bekannt, der mit einem im Wesentlichen tellerfederartig ausgebildeten Blechring abgedeckt ist. Dieser Blechring ist einteilig ausgebildet und kann nur deshalb problemlos an den Kolben montiert werden, weil der Kolben zweiteilig aufgebaut ist. Hierbei ist es erforderlich, erst den Blechring an das Kolbenoberteil zu montieren, bevor dieses mit dem Kolbenunterteil verbunden wird.From the publication DE 40 39 751 A1 is a multi-part cooled piston with a arranged in the edge region of the piston crown cooling channel is known, which is covered with a substantially plate spring-like design metal ring. This metal ring is formed in one piece and can be easily mounted on the piston only because the piston is constructed in two parts. In this case, it is necessary first to mount the sheet metal ring on the upper piston part before it is connected to the lower piston part.

Aus der Europäischen Patentschrift EP 0 799 373 B1 ist einteiliger Kühlkanalkolben mit einem im Randbereich des Kolbenbodens angeordneten Kühlkanal bekannt, der ebenfalls mit einem tellerfederartig ausgebildeten Abdeckring verschlossen ist. Nachteilig ist hierbei, dass dieser Abdeckring zweiteilig ausgebildet sein muss, um montiert werden zu können. Bei der Montage wird jede der beiden halbkreisförmigen Ringhälften einzeln in vorgespanntem Zustand in entsprechende Auflager am Kolbenkopf eingebracht.From the European patent EP 0 799 373 B1 is one-piece cooling channel piston with a arranged in the edge region of the piston crown cooling channel is known, which is also closed with a plate spring-like design cover ring. The disadvantage here is that this cover must be made in two parts to be able to be mounted. During assembly, each of the two semicircular ring halves is introduced individually in the prestressed state in corresponding supports on the piston head.

Ein ähnlicher Kolben mit einem einteiligen Abdeckring ist aus EP1185775 bekannt.A similar piston with a one-piece cover ring is off EP1185775 known.

Hiervon ausgehend liegt der Erfindung das Problem zugrunde, eine einfach zu montierende Kühlkanalabdeckung für einen einteiligen Kolben eines Verbrennungsmotors zu schaffen.On this basis, the invention is based on the problem to provide an easy to install cooling duct cover for a one-piece piston of an internal combustion engine.

Gelöst wird das Problem mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.The problem is solved with the features in the characterizing part of the main claim. 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

Fig. 1
einen Kolben für einen Verbrennungsmotor mit einem Kühlkanal, der gemäß der Erfindung von einem im Wesentlichen zylinderförmigen Ring verschlossen ist, dargestellt in einem aus zwei Hälften bestehenden Schnittbild, das zwei um 90° versetzte Längsschnitte des Kolbens zeigt,
Fig. 2
einen Schnitt des Kolbens entlang der Linie A-A in Fig. 1,
Fig. 3
einen Teilschnitt des Kolbens entlang der Linie C-C in Fig. 2, der ein Ölzuführungsrohr zum Einleiten von Kühlöl in den Kühlkanal zeigt,
Fig. 4
einen Teilschnitt des Kolbens entlang der Linie B-B in Fig.2, der das mit dem Ring verrasteten Ölzuführungsrohr zeigt,
Fig. 5
eine vergrößerte Darstellung des Bereiches "X" in Fig. 4, der die Rastverbindung zwischen dem Ring und dem Ölzuführungsrohr zeigt,
Fig. 6
eine Draufsicht des Ringes mit dem Ölzuführungsrohr und
Fig. 7
eine perspektivische Darstellung des Ringes mit dem Ölzuführungsrohr.
An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1
a piston for an internal combustion engine with a cooling channel, which is closed according to the invention by a substantially cylindrical ring, shown in a two-half sectional image showing two offset by 90 ° longitudinal sections of the piston,
Fig. 2
a section of the piston along the line AA in Fig. 1 .
Fig. 3
a partial section of the piston along the line CC in Fig. 2 showing an oil supply pipe for introducing cooling oil into the cooling passage,
Fig. 4
a partial section of the piston along the line BB in Fig.2 showing the oil supply pipe locked to the ring,
Fig. 5
an enlarged view of the area "X" in Fig. 4 showing the locking connection between the ring and the oil feed pipe,
Fig. 6
a plan view of the ring with the oil supply pipe and
Fig. 7
a perspective view of the ring with the oil supply pipe.

Figur 1 zeigt einen einteilig ausgebildeten Kolben 1 für einen Verbrennungsmotor in einem Schnittbild, das aus zwei Hälften besteht, von denen die linke Hälfte einen Schnitt des Kolbens 1 entlang einer Längsachse 2 einer Nabenbohrung 3 und die rechte Hälfte einen um 90° dazu versetzten Längsschnitt des Kolbens 1 darstellt. Der Kolben 1 ist aus Stahl hergestellt und weist im Bereich des Kolbenbodens 4 eine Brennraummulde 5 auf. Im radial außen liegenden Bereich des Kolbenbodens 4 ist ein ringförmig umlaufender Kühlkanal 6 angeordnet, dessen radial äußere Begrenzung von einer an den Kolbenboden 4 angeformten Ringwand 7 und dessen radial innere Begrenzung teils von einer Ringrippe 8, teils von einer Nabenabstützung 9, 9' und teils von einer Schaftanbindung 10, 10' gebildet werden. Die Ringwand 7 dient hierbei als Kolbenringträger. FIG. 1 shows a one-piece piston 1 for an internal combustion engine in a sectional view, which consists of two halves, of which the left half of a section of the piston 1 along a longitudinal axis 2 of a hub bore 3 and the right half offset by 90 ° thereto longitudinal section of the piston first represents. The piston 1 is made of steel and has a combustion bowl 5 in the region of the piston head 4. In the radially outer region of the piston head 4, an annular circumferential cooling channel 6 is arranged, the radially outer boundary of an integrally formed on the piston head 4 ring wall 7 and its radially inner boundary part of an annular rib 8, partly from a hub support 9, 9 'and partly be formed by a shank connection 10, 10 '. The annular wall 7 serves as a piston ring carrier.

Über die Nabenabstützungen 9, 9' sind an den Kolbenboden 4 je eine Bolzennabe 11, 11' mit jeweils einer Nabenbohrung 3, 3' angeformt. Die Stirnflächen 12 der Bolzennaben 11, 11' sind gegenüber der Ringwand 7 in Richtung der Kolbenlängsachse 13 zurückgesetzt angeordnet. Die Bolzennaben 11, 11' sind über Schaftelemente 14, 14' miteinander verbunden, die über je eine Schaftanbindung 10, 10' an den Kolbenboden 4 angeformt sind. Zwischen den Schaftelementen 14, 14' und dem kolbenbodenseitigen Bereich 15 des Kolbens 1 weist dieser Ausnehmungen 16 auf.About the hub supports 9, 9 'are each a pin boss 11, 11', each with a hub bore 3, 3 'integrally formed on the piston head 4. The end faces 12 of the pin bosses 11, 11 'are arranged opposite to the annular wall 7 in the direction of the piston longitudinal axis 13 reset. The pin hubs 11, 11 'are connected to each other via shaft elements 14, 14', which each have a shank connection 10, 10 'to the piston head 4 are formed. Between the shaft elements 14, 14 'and the piston bottom side region 15 of the piston 1 has these recesses 16.

An der Bolzennabe 11, 11' bzw. an der Schaftanbindung 10, 10' des Kolbens 1 ist ein umlaufender, nasenförmiger Vorsprung 17 angebracht, dessen Zweck darin besteht, als Anlage für einen im Wesentlichen zylinderförmigen, einteiligen Ring 18 zu dienen, von dem der Kühlkanal 6 verschlossen wird. Der Ring 18 kann aus Kunststoff oder aus Metall bestehen. Auf der der Kolbenlängsachse 13 zugewandten Innenseite 28 weist die Ringwand 7 eine umlaufende Nut 19 auf, in die ein ebenfalls umlaufender und kolbenbodenseitig an die Außenseite des Ringes 18 angeformter Kragen 20 einsetzbar ist, wodurch der Ring 18 an der Innenseite der Ringwand 7 befestigbar ist. Wie insb. die Figuren 6 und 7 zeigen, weist der Ring 18 einen Spalt 22 auf.At the pin boss 11, 11 'or at the shaft connection 10, 10' of the piston 1, a circumferential, nose-shaped projection 17 is mounted, the purpose of which is to serve as an abutment for a substantially cylindrical, one-piece ring 18, of which Cooling channel 6 is closed. The ring 18 may be made of plastic or metal. On the piston longitudinal axis 13 facing inner side 28, the annular wall 7 has a circumferential groove 19, in which a likewise circumferential and piston crown side integrally formed on the outside of the ring 18 collar 20 is inserted, whereby the ring 18 on the inside of the annular wall 7 can be fastened. As esp. The FIGS. 6 and 7 show, the ring 18 has a gap 22.

Die Montage des Ringes 18 kann auf einfache Weise dadurch geschehen, dass er aufgebogen und in den Bereich des Kolbens 1 zwischen Ringwand 7 und Schaftelemente 14, 14' eingelegt wird. Im Anschluss daran wird der Ring 18 zusammengedrück, sodass sich sein Radius verkleinert, wobei der schaftseitige, untere Rand des Ringes 18 auf dem Vorsprung 17 zur Anlage gelangt. Dadurch dass der kolbenbodenseitige, obere Rand des Ringes 18 noch ein wenig mehr nach innen gedrückt wird, ist es im Anschluss daran möglich, den Ring von unten in den Kühlkanal 6 so weit einzuschieben, bis zur Fixierung des Ringes 18 dessen Kragen 20 in die Nut 19 auf der Innenseite 28 der Ringwand 7 einrastet.The assembly of the ring 18 can be done in a simple manner in that it is bent and in the region of the piston 1 between the annular wall 7 and shaft elements 14, 14 'is inserted. Following this, the ring 18 is compressed, so that its radius is reduced, wherein the shank side, lower edge of the ring 18 comes to rest on the projection 17. The fact that the piston bottom side, upper edge of the ring 18 is pressed a little more inward, it is then possible to insert the ring from below into the cooling channel 6 so far until the fixation of the ring 18 whose collar 20 into the groove 19 on the inside 28 of the annular wall 7 engages.

In den Spalt 22 ist ein Ölzuführungsrohr 35 einführbar, das aus einem Trichter 21 mit einem rohrförmigen Oberteil 27 besteht, und das beim Einführen den Ring 18 spreizt. Damit ist, wie insb. die Figuren 4 und 5 zeigen, mit Sicherheit dafür gesorgt, dass der Kragen 20 des Ringes 18 auch bei schnelleren Hin- und Herbewegungen des Kolbens 1 in der Nut 19 auf der Innenseite der Ringwand 7 verbleibt. Das Ölzuführungsrohr 35 kann aus Kunststoff oder aus Metall bestehen.In the gap 22, an oil feed tube 35 is inserted, which consists of a funnel 21 with a tubular upper part 27, and which spreads the ring 18 during insertion. This is how esp. The FIGS. 4 and 5 show, with certainty ensured that the collar 20 of the ring 18 remains even with faster reciprocating movements of the piston 1 in the groove 19 on the inside of the annular wall 7. The oil supply pipe 35 may be made of plastic or metal.

Das Ölzuführungsrohr 35 wird, wie in Fig. 3 dargestellt ist, am Kolben 1 befestigt, indem eine am Oberteil 27 angebrachten Nase 23 auf dem oberen Rand einer nahe dem Schaft 14, 14' eingebrachten Öffnung 24 zur Auflage gelangt, nachdem das Ölzuführungsrohr 35 in die Öffnung 24 eingeführt ist. Zudem weist das Oberteil 27, wie die Fig. 4, 5 und 7 zeigen, auf seiner dem Kolbenboden zugewandten Außenseite eine umlaufende Nut 25 auf, in die beim Einführen des Ölzuführungsrohres 35 in die Öffnung 24 auf der Innenseite des Ringes 18 an seinen Stoßstellen 29 und 30 angeformte Vorsprünge 26, 26' einklipsen, wodurch das Ölzuführungsrohr 35 am Ring 18 befestigt wird.The oil supply pipe 35 becomes, as in Fig. 3 is attached to the piston 1 by a mounted on the upper part 27 nose 23 on the upper edge of a near the shaft 14, 14 'introduced opening 24 comes to rest after the Oil supply pipe 35 is inserted into the opening 24. In addition, the upper part 27, like the Fig. 4, 5 and 7 show, on its the piston crown outer side facing a circumferential groove 25, in which when inserting the oil supply pipe 35 in the opening 24 on the inside of the ring 18 at its joints 29 and 30 integrally molded projections 26, 26 ', whereby the oil supply pipe 35 at Ring 18 is attached.

Hierbei weist die Nut 25 einen bestimmten Abstand von der kolbenbodenseitigen Stirnfläche 33 des Oberteiles 27 auf, der ausreicht, dass sich, wie in den Figuren 5 und 7 dargestellt ist, ein Überstand 34 des Oberteiles 27 ergibt, damit das in den Kühlkanal 6 eingeleitete Öl nicht sofort wieder durch das Oberteil 27 aus dem Kühlkanal 6 abfließt und stattdessen um den Überstand 34 herum in den tiefer gelegenen Bereich des Kühlkanals 6 geleitet wird. Über eine seitlich im Ring 18 angebrachte Öffnung 36 (Fig. 7) kann das Kühlöl dann abfließen.Here, the groove 25 at a certain distance from the piston bottom side end face 33 of the upper part 27, which is sufficient that, as in the Figures 5 and 7 is shown, a projection 34 of the upper part 27 results, so that the introduced into the cooling channel 6 oil does not flow immediately through the upper part 27 from the cooling channel 6 and instead is passed to the supernatant 34 in the lower region of the cooling channel 6. Via a laterally mounted in the ring 18 opening 36 (FIG. Fig. 7 ), the cooling oil can then drain.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kolbenpiston
22
Längsachselongitudinal axis
3, 3'3, 3 '
Nabenbohrunghub bore
44
Kolbenbodenpiston crown
55
BrennraummuldeCombustion bowl
66
Kühlkanalcooling channel
77
Ringwandring wall
88th
Ringrippeannular rib
9, 9'9, 9 '
Nabenabstützungboss support
10, 10'10, 10 '
Schaftanbindungskirt connection
11, 11'11, 11 '
Bolzennabepin boss
1212
Stirnfläche der Bolzennabe 11, 11'End face of the pin boss 11, 11 '
1313
Kolbenlängsachsepiston longitudinal axis
14, 14'14, 14 '
Schaftelementshaft element
1515
kolbenbodenseitiger Bereich des Kolbens 1piston bottom side portion of the piston. 1
1616
Ausnehmungrecess
1717
Vorsprunghead Start
1818
Ringring
1919
Nutgroove
2020
Kragencollar
2121
Trichterfunnel
2222
Spaltgap
2323
Nasenose
2424
Öffnungopening
2525
Nutgroove
26, 26'26, 26 '
Vorsprunghead Start
2727
Oberteil des Ölzuführungsrohres 35Upper part of the oil supply pipe 35
2828
Innenseite der Ringwand 7Inside the annular wall. 7
29, 3029, 30
Stoßstellen des Ringes 18Butt joints of the ring 18
3333
Stirnfläche des Oberteiles 27End face of the upper part 27
3434
Überstand des Oberteiles 27Overhang of the upper part 27
3535
ÖlzuführungsrohrOil supply pipe
3636
Öffnung der Ringes 18Opening of the ring 18

Claims (8)

  1. A one-part piston (1) for an internal combustion engine, comprising:
    - a piston crown (4);
    - two pin boss supports (9, 9'), integrally formed on the piston crown (4), for a respective pin boss (11, 11'), wherein the pin boss supports (9, 9') and the end faces (12) of the pin bosses (11, 11') are recessed with respect to the radially outer edge of the piston crown (4) in the direction of the piston longitudinal axis (13);
    - two skirt elements (14, 14') that connect the pin bosses (11, 11') and that are connected to the piston crown (4) by way of a respective skirt connection (10, 10'), wherein recesses (16) are formed into the shaft connections (10, 10') between the skirt elements (14, 14') and the piston crown (4);
    an annular cooling channel (6), which is disposed in the edge region of the piston crown (4) and the radially outer delimitation of which is formed by a ring wall (7) integrally formed on the piston crown (4), and the radially inner delimitation of which is formed partly by the pin boss supports (9, 9') and partly by the skirt connections (10, 10'); and
    - a peripheral projection (17) that is partly integrally formed on the pin boss supports (9, 9') and partly on the skirt connections (10, 10') and has a nose-shaped cross-section,
    characterized in that
    - the cooling channel (6) is closed by a substantially cylindrical, one-part ring (18) having an axially oriented continuous gap (22) and a peripheral collar (20) disposed on the outside thereof, the collar forming a detent connection together with a peripheral groove (19) formed into the inside (28) of the ring wall (7), the ring (18) being seated on the projection (17),
    - wherein an axially oriented borehole (24) is introduced into one of the skirt connections (14, 14'), into the borehole (24) an oil feed pipe (35) being insertible, which with the upper part thereof (27) opens into the cooling channel (6) in the region of the ring (18), and the ring ends (29, 30) of the ring (18) being seated on the upper part (27) of the oil feed pipe (35).
  2. The one-part piston (1) for an internal combustion engine according to claim 1, characterized in that the upper part (27) has a peripheral groove (25) on outside thereof, close to the end face (33) on the piston crown side, projections (26, 26') that are provided on the ring ends (29, 30) of the ring (18) forming detent connections together with this groove after the oil feed pipe (35) has been inserted into the borehole (24).
  3. The one-part piston (1) for an internal combustion engine, according to claim 2, characterized in that the groove (25) is disposed at a distance from the end face (33) of the upper part (27), resulting in an overhang (34) of the upper part (27) beyond the ring (18).
  4. The one-part piston (1) for an internal combustion engine according to claims 1 to 3, characterized in that the upper part (27) in the center region of the outside thereof has a nose (23), which rests on the upper edge of the borehole (24) after the oil feed pipe (35) has been inserted into the borehole (24).
  5. The one-part piston (1) for an internal combustion engine according to any one of claims 1 to 4, characterized in that the oil feed pipe (35) is made of metal.
  6. The one-part piston (1) for an internal combustion engine according to any one of claims 1 to 4, characterized in that the oil feed pipe (35) is made of a heat-resistant plastic material.
  7. The one-part piston (1) for an internal combustion engine according to any one of the preceding claims, characterized in that the ring (18) is made of metal.
  8. The one-part piston (1) for an internal combustion engine according to any one of the preceding claims, characterized in that the ring (18) is made of a heat-resistant plastic material.
EP04789925.7A 2003-10-06 2004-10-04 One-piece piston for an internal combustion engine Ceased EP1678418B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10346819A DE10346819A1 (en) 2003-10-06 2003-10-06 One-piece piston for an internal combustion engine
PCT/DE2004/002214 WO2005035961A1 (en) 2003-10-06 2004-10-04 One-piece piston for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1678418A1 EP1678418A1 (en) 2006-07-12
EP1678418B1 true EP1678418B1 (en) 2016-12-14

Family

ID=34353355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04789925.7A Ceased EP1678418B1 (en) 2003-10-06 2004-10-04 One-piece piston for an internal combustion engine

Country Status (8)

Country Link
US (1) US7409903B2 (en)
EP (1) EP1678418B1 (en)
JP (1) JP4518426B2 (en)
KR (1) KR101205647B1 (en)
CN (1) CN100591909C (en)
BR (1) BRPI0415301A (en)
DE (1) DE10346819A1 (en)
WO (1) WO2005035961A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102021133609B3 (en) 2021-12-17 2023-02-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Pistons with function-optimized piston cooling

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DE102007027162A1 (en) * 2007-06-13 2008-12-18 Mahle International Gmbh Two-piece piston for an internal combustion engine
US9238283B2 (en) 2008-07-24 2016-01-19 Ks Kolbenschmidt Gmbh Friction welded steel piston having optimized cooling channel
DE102008034430B4 (en) * 2008-07-24 2015-02-19 Ks Kolbenschmidt Gmbh Friction welded steel piston with optimized cooling channel
DE102008055848A1 (en) 2008-11-04 2010-05-06 Ks Kolbenschmidt Gmbh Cooling channel piston of an internal combustion engine with a closure element which closes the cooling channel
US8776670B2 (en) * 2010-02-17 2014-07-15 Mahle International Gmbh Piston assembly
DE102011106379A1 (en) * 2011-07-04 2013-01-10 Mahle International Gmbh Piston for an internal combustion engine
DE102013002232B4 (en) * 2013-02-11 2022-11-17 Man Energy Solutions Se Pistons of an internal combustion engine
DE102015206375A1 (en) * 2014-04-09 2015-10-15 Ks Kolbenschmidt Gmbh Extended cooling channel inlet for cooling channel pistons and method for its operation
DE102014015946A1 (en) * 2014-10-30 2016-05-19 Mahle International Gmbh Cooling duct cover and piston provided with a cooling channel cover
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DE10346819A1 (en) 2005-04-21
EP1678418A1 (en) 2006-07-12
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US7409903B2 (en) 2008-08-12
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US20070039460A1 (en) 2007-02-22
BRPI0415301A (en) 2006-12-05

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