EP1963655A1 - Piston for an internal combustion engine and method of producing it - Google Patents

Piston for an internal combustion engine and method of producing it

Info

Publication number
EP1963655A1
EP1963655A1 EP06828686A EP06828686A EP1963655A1 EP 1963655 A1 EP1963655 A1 EP 1963655A1 EP 06828686 A EP06828686 A EP 06828686A EP 06828686 A EP06828686 A EP 06828686A EP 1963655 A1 EP1963655 A1 EP 1963655A1
Authority
EP
European Patent Office
Prior art keywords
piston
cooling channel
cooling
salt core
projections
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Withdrawn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
EP06828686A
Other languages
German (de)
French (fr)
Inventor
Arnold Benz
Helmut Kollotzek
Markus Leitl
Sven Schilling
Ernst Limbach
Josip Zvonkovic
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 EP1963655A1 publication Critical patent/EP1963655A1/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Withdrawn legal-status Critical Current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 
    • F02F3/16—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/002—Removing cores by leaching, washing or dissolving
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/06—Casting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49252—Multi-element piston making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49274—Piston ring or piston packing making

Definitions

  • the invention relates to a piston for an internal combustion engine according to the preamble of claim 1 and a method for its production according to claim 6.
  • US Pat. No. 4,662,319 discloses a built-up piston for an internal combustion engine which comprises a piston main body with pin bosses and a piston upper part connected thereto.
  • the piston base body On the piston bottom side, the piston base body has an annular bearing surface on which the piston upper part rests, and which is connected to the pin bosses via conically shaped wall elements.
  • the wall elements form an annular space approaching the pin bosses, which is covered on the piston bottom side by a ring element which has openings through which cooling oil is introduced into the annular space with which the pin bosses are cooled.
  • the ring member further includes a radially outwardly formed in the underside of the piston upper part recess, so that there is a closed, annular cooling channel for cooling the annular grooves.
  • the disadvantage here is the complicated structure of the known from the US patent piston, whereby the production of the piston is complicated and expensive.
  • Show it 1 shows a section through a piston shown in perspective with a circumferential cooling channel, each having a Nabenk ⁇ hl- channel in the region of the pin bosses,
  • FIG. 2 shows a section through the piston shown in perspective with a cooling channel according to FIG. 2, which has a plurality of hump-shaped and piston-bottom-side arranged cross-sectional widenings, FIG.
  • FIG 3 shows a section through the piston, which is shown in perspective, with a hub cooling channel, which is connected to the cooling channel only via an oil inlet opening, and
  • Fig. 4 shows a section through the piston shown in perspective with a cooling channel having in the region of the pin bosses depending on a radially inwardly directed, surface-shaped Nabenkühlkanal.
  • Fig. 1 shows a perspective view of a piston 1 for an internal combustion engine in section with a combustion bowl 2 in the piston head 3.
  • the radial outer surface of the piston 1 has an adjacent to the piston crown 3 land land 4 and adjacent to a ring section 5, followed by a rotating shaft 6 connects.
  • On opposite sides of the shaft 6 are each a pin hub 7, each with a hub bore 8 is held.
  • the piston 1 in the piston crown radially outside an annular, circumferential cooling channel 9, is introduced into the cooling oil via an opening into the piston interior 14 oil supply passage 10, and from the cooling oil via a in the Figures not shown, discharged into the piston interior 14 ⁇ lab Concretekanal is discharged again.
  • the cooling channel 9 is connected to one in the areas T of the two pin bosses 7 arranged Nabenkühlkanal 13, wherein the two Nabenkühlkanäle 13 via one oil inlet opening 11 and one each Oil drain opening 12 are connected to the cooling channel 9.
  • the two Nabenkühlkanäle 13 also each have an opening into the piston interior 14 oil drain channel 15.
  • a salt core is initially formed, which has the shape of the cooling channel 9 with the hub cooling channels 13 formed thereon, each with an oil drain channel 15.
  • the salt core is then placed in a mold and encapsulated with the piston material, i.e., with aluminum or with cast iron.
  • the oil supply channel 10 and the ⁇ lab Industrieskanal is drilled into the piston 1, through which the salt of the salt core is washed out of the piston blank.
  • the piston is completed by means of a machining process.
  • FIG. 2 an embodiment of a cooling channel 9 1 is shown, distributed over the entire circumference, piston bottom side arranged humpy cross-sectional extensions 16 whose purpose is to improve the cooling of the thermally highly loaded edge of the combustion bowl 2 in that the cooling channel 9 'in the areas of the cross-sectional widenings 16 comes closer to the edge of the combustion chamber trough 2, so that the cooling oil can get closer to the trough edge.
  • Fig. 3 an embodiment of the Nabenkühlkanals 13 'is shown, which is connected exclusively via the oil drain passage 15 with the piston interior 14, so that the entire through the Nabenkühlkanal 13' flowing oil is fed into the piston interior 14.
  • the design of the cooling channel 9 "according to FIG. 4 has in each case a radially inwardly directed, in plan view flat surface-shaped hub cooling channel 17 in the piston bottom side regions T of the pin bosses 7, from which cooling oil is conducted via the oil drain channel 15 into the piston interior 14 area-wide - A -
  • Th Nabenkühlkanals 17 is a relatively large area of the pin bosses 7 covered with cooling surface, which comes into contact with cooling oil, so that in this way a very good cooling of the areas T of the pin bosses 7 is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

A piston (1) for an internal combustion engine is proposed, comprising an annular cooling passage (9) arranged in the vicinity of the piston crown and radially on the outside, which, in those regions (71) of the pin bosses (7) which lie close to the boss holes (8), has boss cooling passages (13) which are connected to the cooling passage (9) and are intended for improved cooling of the pin bosses (7).

Description

Kolben für einen Verbrennungsmotor und Verfahren zu dessen Herstellung Piston for an internal combustion engine and method for its production
Die Erfindung betrifft einen Kolben für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1 und ein Verfahren zu dessen Herstellung nach Anspruch 6.The invention relates to a piston for an internal combustion engine according to the preamble of claim 1 and a method for its production according to claim 6.
Aus der US-Patentschrift mit der Nummer US 4 662 319 ist ein gebauter Kolben für einen Verbrennungsmotor bekannt, der aus einem Kolbengrundkörper mit Bolzennaben und einem damit verbundenen Kolbenoberteil besteht. Der Kolbengrundkörper weist kolbenbodenseitig eine ringförmige Auflagefläche auf, auf der das Kolbenoberteil aufliegt, und die über konisch geformte Wandelemente mit den Bolzennaben verbunden ist. Die Wandelemente bilden einen an die Bolzennaben heranreichenden Ringraum, der kolbenbodenseitig von einem Ringelement abgedeckt wird, das Öffnungen aufweist, über die Kühlöl in den Ringraum eingeleitet wird, mit dem die Bolzennaben gekühlt werden. Das Ringelement schließt darüber hinaus eine radial außen in die Unterseite des Kolbenoberteils eingeformte Ausnehmung ab, sodass sich ein geschlossener, ringförmiger Kühlkanal zur Kühlung der Ringnuten ergibt. Nachteilig ist hierbei der komplizierte Aufbau des aus der US-Patentschrift bekannten Kolbens, wodurch die Herstellung des Kolbens aufwendig und teuer wird.US Pat. No. 4,662,319 discloses a built-up piston for an internal combustion engine which comprises a piston main body with pin bosses and a piston upper part connected thereto. On the piston bottom side, the piston base body has an annular bearing surface on which the piston upper part rests, and which is connected to the pin bosses via conically shaped wall elements. The wall elements form an annular space approaching the pin bosses, which is covered on the piston bottom side by a ring element which has openings through which cooling oil is introduced into the annular space with which the pin bosses are cooled. The ring member further includes a radially outwardly formed in the underside of the piston upper part recess, so that there is a closed, annular cooling channel for cooling the annular grooves. The disadvantage here is the complicated structure of the known from the US patent piston, whereby the production of the piston is complicated and expensive.
Diesen Nachteil des Standes der Technik zu vermeiden, ist Aufgabe der Erfindung. Gelöst wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen und mit den Merkmalen des Verfahrensanspruches 6. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.To avoid this disadvantage of the prior art is an object of the invention. This object is achieved with the features in the characterizing part of the main claim and with the features of the method claim 6. Expedient embodiments of the invention are the subject of the dependent claims.
Einige Ausführungsbeispiele der Erfindung werden im Folgenden anhand der Zeichnungen beschrieben. Es zeigen Fig. 1 einen Schnitt durch einen perspektivisch dargestellten Kolben mit einem umlaufenden Kühlkanal, der im Bereich der Bolzennaben je einen Nabenkϋhl- kanal aufweist,Some embodiments of the invention will be described below with reference to the drawings. Show it 1 shows a section through a piston shown in perspective with a circumferential cooling channel, each having a Nabenkϋhl- channel in the region of the pin bosses,
Fig. 2 einen Schnitt durch den perspektivisch dargestellten Kolben mit einem Kühlkanal gemäß Fig. 2, der mehrere, höckerartige und kolbenbodenseitig angeordnete Querschnittserweiterungen aufweist,2 shows a section through the piston shown in perspective with a cooling channel according to FIG. 2, which has a plurality of hump-shaped and piston-bottom-side arranged cross-sectional widenings, FIG.
Fig. 3 einen Schnitt durch den perspektivisch dargestellten Kolben mit einem Na- benkühlkanal, der lediglich über eine Ölzulauföffnung mit dem Kühlkanal verbunden ist, und3 shows a section through the piston, which is shown in perspective, with a hub cooling channel, which is connected to the cooling channel only via an oil inlet opening, and
Fig. 4 einen Schnitt durch den perspektivisch dargestellten Kolben mit einem Kühlkanal, der im Bereich der Bolzennaben je einen nach radial innen gerichteten, flächig ausgebildeten Nabenkühlkanal aufweist.Fig. 4 shows a section through the piston shown in perspective with a cooling channel having in the region of the pin bosses depending on a radially inwardly directed, surface-shaped Nabenkühlkanal.
Fig. 1 zeigt einen perspektivisch dargestellten Kolben 1 für einen Verbrennungsmotor im Schnitt mit einer Brennraummulde 2 im Kolbenboden 3. Die radiale Außenfläche des Kolbens 1 weist einen an den Kolbenboden 3 angrenzenden Feuersteg 4 und daran angrenzend eine Ringpartie 5 auf, woran sich ein umlaufender Schaft 6 anschließt. Auf einander gegenüberliegenden Seiten werden vom Schaft 6 je eine Bolzennabe 7 mit je einer Nabenbohrung 8 gehalten.Fig. 1 shows a perspective view of a piston 1 for an internal combustion engine in section with a combustion bowl 2 in the piston head 3. The radial outer surface of the piston 1 has an adjacent to the piston crown 3 land land 4 and adjacent to a ring section 5, followed by a rotating shaft 6 connects. On opposite sides of the shaft 6 are each a pin hub 7, each with a hub bore 8 is held.
Zur Kühlung der Brennraummulde 2 und der Ringpartie 5 weist der Kolben 1 in Kolbenbodennähe, radial außen einen ringförmigen, umlaufenden Kühlkanal 9 auf, in den Kühlöl über einen in den Kolbeninnenraum 14 mündenden Ölzuführkanal 10 eingeleitet wird, und aus dem das Kühlöl über einen in den Figuren nicht dargestellten, in den Kolbeninnenraum 14 mündenden Ölabführkanal wieder ausgeleitet wird.To cool the combustion bowl 2 and the ring section 5, the piston 1 in the piston crown, radially outside an annular, circumferential cooling channel 9, is introduced into the cooling oil via an opening into the piston interior 14 oil supply passage 10, and from the cooling oil via a in the Figures not shown, discharged into the piston interior 14 Ölabführkanal is discharged again.
Zur Kühlung der nahe den Nabenbohrungen 8 liegenden kolbenbodenseitigen Bereiche T der beiden einander gegenüberliegenden Bolzennaben 7 ist der Kühlkanal 9 mit je einem in den Bereichen T der beiden Bolzennaben 7 angeordneten Nabenkühlkanal 13 verbunden, wobei die beiden Nabenkühlkanäle 13 über je eine Ölzulauföffnung 11 und je eine Ölablauföffnung 12 an den Kühlkanal 9 angeschlossen sind. Die beiden Nabenkühlkanäle 13 weisen zudem je einen in den Kolbeninnenraum 14 mündenden Ölablaufkanal 15 auf. Hierbei wird ein Teil des über den Ölzuführkanal 10 in den Kühlkanal 9 eingespritzten Kühlöles über die Ölzulauföffnungen 11 in der Nabenkühlkanäle 13 eingeleitet und nach Kühlung der kolbenbodenseitigen Bereiche T der Bolzennaben 7 teils über die Ölablaufkanäle 15 in den Kolbeninnenraum 14 abgeleitet und teils über die Ölzulauföffnungen 12 in den Kühlkanal 9 zurückgeführt.For cooling the near the hub bores 8 lying piston bottom side portions T of the two opposing pin bosses 7, the cooling channel 9 is connected to one in the areas T of the two pin bosses 7 arranged Nabenkühlkanal 13, wherein the two Nabenkühlkanäle 13 via one oil inlet opening 11 and one each Oil drain opening 12 are connected to the cooling channel 9. The two Nabenkühlkanäle 13 also each have an opening into the piston interior 14 oil drain channel 15. Here, a portion of the injected via the oil supply 10 in the cooling channel 9 cooling oil via the oil inlet openings 11 in the Nabenkühlkanäle 13 is introduced and derived after cooling the piston bottom side portions T of the pin bosses 7 partly via the oil drain channels 15 in the piston interior 14 and partly via the oil inlet openings 12th returned to the cooling channel 9.
Zur Herstellung des Kolbens 1 mit dem erfindungsgemäßen Kühlkanalsystem wird zunächst ein Salzkern geformt, der die Form des Kühlkanals 9 mit den daran angeformten Nabenkühlkanälen 13 mit je einem Ölablaufkanal 15 aufweist. Der Salzkern wird dann in eine Gießform eingelegt und mit dem Kolbenmaterial, d.h., mit Aluminium oder mit Gusseisen, umgössen. Anschließend wird der Ölzuführkanal 10 und der Ölabführkanal in den Kolben 1 eingebohrt, über die das Salz des Salzkernes aus dem Kolbenrohling ausgewaschen wird. Letztlich wird der Kolben mittels eines spanabhebenden Fertigungsverfahrens fertiggestellt.To produce the piston 1 with the cooling channel system according to the invention, a salt core is initially formed, which has the shape of the cooling channel 9 with the hub cooling channels 13 formed thereon, each with an oil drain channel 15. The salt core is then placed in a mold and encapsulated with the piston material, i.e., with aluminum or with cast iron. Subsequently, the oil supply channel 10 and the Ölabführkanal is drilled into the piston 1, through which the salt of the salt core is washed out of the piston blank. Finally, the piston is completed by means of a machining process.
In Fig. 2 ist eine Ausgestaltung eines Kühlkanals 91 dargestellt, die über den gesamten Umfang verteilte, kolbenbodenseitig angeordnete, höckerartige Querschnittserweiterungen 16 aufweist, deren Zweck darin besteht, die Kühlung des thermisch hoch belasteten Randes der Brennraummulde 2 dadurch zu verbessern, dass der Kühlkanal 9' in den Bereichen der Querschnittserweiterungen 16 näher an den Rand der Brennraummulde 2 heranreicht, sodass auch das Kühlöl näher an den Muldenrand gelangen kann.In Fig. 2, an embodiment of a cooling channel 9 1 is shown, distributed over the entire circumference, piston bottom side arranged humpy cross-sectional extensions 16 whose purpose is to improve the cooling of the thermally highly loaded edge of the combustion bowl 2 in that the cooling channel 9 'in the areas of the cross-sectional widenings 16 comes closer to the edge of the combustion chamber trough 2, so that the cooling oil can get closer to the trough edge.
In Fig. 3 ist eine Ausgestaltung des Nabenkühlkanals 13' gezeigt, der ausschließlich über den Ölablaufkanal 15 mit dem Kolbeninnenraum 14 verbunden ist, sodass das gesamte durch den Nabenkühlkanal 13' fließende Öl in den Kolbeninnenraum 14 geleitet wird.In Fig. 3, an embodiment of the Nabenkühlkanals 13 'is shown, which is connected exclusively via the oil drain passage 15 with the piston interior 14, so that the entire through the Nabenkühlkanal 13' flowing oil is fed into the piston interior 14.
Die Ausgestaltung des Kühlkanals 9" gemäß Fig. 4 weist in den kolbenbodenseitigen Bereichen T der Bolzennaben 7 je einen nach radial innen ausgerichteten, in Draufsicht flächenförmig ausgebildeten Nabenkühlkanal 17 auf, aus dem Kühlöl über den Ölablaufkanal 15 in das Kolbeninnere 14 geleitet wird. Mittels des flächig ausgebilde- - A -The design of the cooling channel 9 "according to FIG. 4 has in each case a radially inwardly directed, in plan view flat surface-shaped hub cooling channel 17 in the piston bottom side regions T of the pin bosses 7, from which cooling oil is conducted via the oil drain channel 15 into the piston interior 14 area-wide - A -
ten Nabenkühlkanals 17 ist ein relativ großer Bereich der Bolzennaben 7 mit Kühlfläche überdeckt, die mit Kühlöl in Kontakt kommt, sodass hierdurch eine sehr gute Kühlung der Bereiche T der Bolzennaben 7 erreicht wird. Th Nabenkühlkanals 17 is a relatively large area of the pin bosses 7 covered with cooling surface, which comes into contact with cooling oil, so that in this way a very good cooling of the areas T of the pin bosses 7 is achieved.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Kolben1 piston
2 Brennraummulde2 combustion bowl
3 Kolbenboden3 piston bottom
4 Feuersteg4 lancet
5 Ringpartie5 ring game
6 Schaft6 shaft
7 Bolzennabe7 pin hub
T BolzennabenbereichT pin hub area
8 Nabenbohrung 9, 9', 9" Kühlkanal8 hub bore 9, 9 ', 9 "cooling channel
10 Ölzuführkanal10 oil supply channel
11 Ölzulauföffnung11 oil inlet opening
12 Ölablauföffnung 13, 13' Nabenkühlkanal12 oil drain opening 13, 13 'hub cooling channel
14 Kolbeninnenraum14 piston interior
15 Ölablaufkanal15 oil drainage channel
16 Querschnittserweiterung16 cross-sectional enlargement
17 Nabenkühlkanal 17 Hub cooling channel

Claims

Patentansprüche claims
1. Kolbens (1 ) für einen Verbrennungsmotor1st piston (1) for an internal combustion engine
- mit einer auf der radialen Außenfläche des Kolbens (1) in Kolbenbodennähe angeordneten Ringpartie (5),with a ring part (5) arranged on the radial outer surface of the piston (1) near the piston bottom,
- mit einem sich an die Ringpartie (5) in kolbenbodenabgewandte Richtung anschließenden Schaft (6),with a shank (6) adjoining the ring part (5) in the direction away from the piston crown,
- mit zwei einander gegenüberliegenden und vom Schaft (6) gehaltenen Bolzennaben (7) mit je einer Nabenbohrung (8),- With two opposite and by the shaft (6) held pin bosses (7), each with a hub bore (8),
- mit einem ringförmigen, in Kolbenbodennähe und radial außen angeordneten Kühlkanal (9, 9\ 9") zur Kühlung der Ringpartie (5), der über einen Ölzuführ- kanal (10) und einen Ölabführkanal mit dem Kolbeninnenraum (14) verbunden ist, und- With an annular, near the piston bottom and radially outward cooling channel (9, 9 \ 9 ") for cooling the ring part (5), which is connected via an oil feed (10) and a Ölabführkanal with the piston interior (14), and
- mit mindestens einen Nabenkühlkanal (13, 13', 17) zur Kühlung der Bolzennaben (7), dadurch gekennzeichnet, dass in den nahe dem Kolbenboden (3) liegenden Bereichen (71) der Bolzennaben (7) jeweils ein mit dem Kühlkanal (9, 9\ 9") in Verbindung stehender Nabenkühlkanal (13, 13', 17) angeordnet ist.- With at least one Nabenkühlkanal (13, 13 ', 17) for cooling the pin bosses (7), characterized in that in the near the piston head (3) lying areas (7 1 ) of the pin bosses (7) each one with the cooling channel ( 9, 9 \ 9 ") in connection hub cooling channel (13, 13 ', 17) is arranged.
2. Kolben nach Anspruch 1, dadurch gekennzeichnet, dass die Nabenkühlkanä- Ie (13, 13', 17) über je eine Ölzulauföffnung (11) an den Kühlkanal (9) angeschlossen sind und über je einen Ölablaufkanal (15) mit dem Kolbeninnenraum (14) in Verbindung stehen.2. Piston according to claim 1, characterized in that the Nabenkühlkanä- Ie (13, 13 ', 17) via one oil inlet opening (11) to the cooling channel (9) are connected and via an oil drain passage (15) with the piston interior ( 14).
3. Kolben nach Anspruch 2, dadurch gekennzeichnet, dass die Nabenkühlkanä- Ie (13) über je eine Ölablauföffnung (12) an den Kühlkanal (9) angeschlossen sind.3. Piston according to claim 2, characterized in that the Nabenkühlkanä- Ie (13) via a respective oil drain opening (12) to the cooling channel (9) are connected.
4. Kolben nach Anspruch 1, dadurch gekennzeichnet, dass die Nabenkühlkanä- Ie (17) nach radial innen ausgerichtet sind, in Draufsicht flächenförmig ausgebildete sind und sich über die kolbenbodenseitigen Bereiche (71) der Bolzennaben (7) erstrecken. 4. Piston according to claim 1, characterized in that the Nabenkühlkanä- Ie (17) are aligned radially inwardly, are planar in plan view formed and extending over the piston bottom side portions (7 1 ) of the pin bosses (7).
5. Kolben nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kühlkanal (91) über den Umfang verteilte, kolbenbodenseitig angeordnete, höckerartig ausgebildete Querschnittserweiterungen (16) aufweist.5. Piston according to one of claims 1 to 4, characterized in that the cooling channel (9 1 ) distributed over the circumference, piston bottom side arranged, hump-shaped cross-sectional extensions (16).
6. Verfahren zur Herstellung eines Kolbens (1 ) für einen Verbrennungsmotor gekennzeichnet durch die folgenden Verfahrensschritte-.6. A method for producing a piston (1) for an internal combustion engine characterized by the following Verfahrensschritte-.
- Herstellen eines Salzkemes in Form eines ringförmigen Kühlkanals (9, 9\ 9") mit zwei auf einander gegenüberliegenden Seiten des Salzkernes angeordneten und nach radial innen ausgerichteten Anformungen in Form von Na- benkühlkanälen (13, 13', 17),- Preparation of a salt core in the form of an annular cooling channel (9, 9 \ 9 ") with two on opposite sides of the salt core arranged and radially inwardly oriented projections in the form of hub benkankanchen channels (13, 13 ', 17),
- Bereitstellen einer Gießform für den Kolben (1) mit zwei zu den Bolzennaben (7) komplementären, einander gegenüberliegenden Anformungen und mit zwei, einander gegenüberliegenden, in radialer Richtung in die Gießform einschiebbaren Schiebern für zwei in den Bolzennaben (7) angeordneten Nabenbohrung (8),- Providing a mold for the piston (1) with two to the pin bosses (7) complementary, opposite projections and with two opposite, radially insertable into the mold slides for two in the pin bosses (7) arranged hub bore (8 )
- Einlegen und Befestigen des Salzkernes in der Gießform derart, dass die Anformungen für die Nabenkühlkanäle (13, 13', 17) auf der kolbenbodenzuge- wandten Seite der für die Bolzennaben (7) vorgesehenen Anformungen zu liegen kommen,Inserting and fixing the salt core in the casting mold in such a way that the projections for the hub cooling channels (13, 13 ', 17) come to lie on the piston-head-facing side of the projections intended for the pin bosses (7),
- Einschieben der für die Nabenbohrungen (8) vorgesehenen Schieber,Inserting the slides provided for the hub bores (8),
- Füllen der Gießform mit dem in flüssiger Form vorliegenden Kolbenmaterial, wobei der Salzkern umgössen wird,Filling the casting mold with the piston material in liquid form, wherein the salt core is encapsulated,
- Einführen eines Schiebers für das Ausformen des Kolbeninnenraumes (14),Inserting a slide for forming the piston interior (14),
- Entnehmen des Kolbenrohlings aus der Gießform,Removing the piston blank from the casting mold,
- Bohren mindestens eines in den Kühlkanal (9, 9', 9") mündenden Ölzuführ- kanals (10) und mindestens eines mit dem Kühlkanal (9, 9', 9") in Verbindung stehenden Ölabführkanals,Drilling at least one oil supply channel (10) opening into the cooling channel (9, 9 ', 9 ") and at least one oil discharge channel communicating with the cooling channel (9, 9', 9"),
- Auswaschen des Salzkernes aus dem Kühlkanal (9, 9', 9") über den Ölzu- führkanal (10) und den Ölabführkanal,Washing out the salt core from the cooling channel (9, 9 ', 9 ") via the oil supply channel (10) and the oil discharge channel,
- Fertigstellen des Kolbens (1 ) mit Hilfe eines spanabhebenden Fertigungsverfahrens. - Completion of the piston (1) by means of a machining production process.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass als Kolbenmaterial flüssiges Aluminium in die Gießform gegossen wird.7. The method according to claim 6, characterized in that as a piston material liquid aluminum is poured into the mold.
8. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass als Kolbenmaterial flüssiges Gusseisen in die Gießform gegossen wird.8. The method according to claim 6, characterized in that as a piston material liquid cast iron is poured into the mold.
9. Verfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die beiden an den Salzkern angebrachten und einander gegenüberliegenden Anformungen für die Nabenkühlkanäle (13') jeweils auf einer Seite mit dem Salzkern verbunden sind und jeweils auf der anderen Seite eine weitere Anformungen für einen im Wesentlichen in axiale und kolbenbodenabgewandte Richtung weisenden Ölablaufkanal (15) aufweisen.9. The method according to any one of claims 6 to 8, characterized in that the two attached to the salt core and opposing projections for the Nabenkühlkanäle (13 ') are each connected on one side with the salt core and each on the other side a further projections have an oil drain passage (15) facing substantially in the axial and piston bottom facing away direction.
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass die jeweiligen anderen Seiten der Anformungen in Form der Nabenkühlkanäle (13) mit dem Salzkern verbunden sind.10. The method according to claim 9, characterized in that the respective other sides of the projections in the form of Nabenkühlkanäle (13) are connected to the salt core.
11. Verfahren nach einem der Anprüche 6 bis 8, dadurch gekennzeichnet, dass die an den Salzkern angebrachten Anformungen für die Nabenkühlkanäle (17) in Draufsicht flächig ausgebildet sind. 11. The method according to any one of Anprüche 6 to 8, characterized in that the attached to the salt core projections for the Nabenkühlkanäle (17) are formed flat in plan view.
EP06828686A 2005-12-21 2006-12-15 Piston for an internal combustion engine and method of producing it Withdrawn EP1963655A1 (en)

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DE102005061075A DE102005061075A1 (en) 2005-12-21 2005-12-21 Piston for internal combustion engine has hub cooling channels arranged in bolt hub regions close to bottom of piston and each connected to cooling channel
PCT/DE2006/002255 WO2007073719A1 (en) 2005-12-21 2006-12-15 Piston for an internal combustion engine and method of producing it

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EP (1) EP1963655A1 (en)
JP (1) JP2009520901A (en)
KR (1) KR20080080546A (en)
CN (1) CN101331309B (en)
BR (1) BRPI0620283A2 (en)
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US7921555B2 (en) 2011-04-12
KR20080080546A (en) 2008-09-04
JP2009520901A (en) 2009-05-28
CN101331309B (en) 2010-12-08
BRPI0620283A2 (en) 2011-11-08
WO2007073719A1 (en) 2007-07-05
CN101331309A (en) 2008-12-24
DE102005061075A1 (en) 2007-06-28
US20090025550A1 (en) 2009-01-29

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