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EP0007661B1 - Assembled internal combustion engine piston having liquid cooling means - Google Patents

Assembled internal combustion engine piston having liquid cooling means Download PDF

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Publication number
EP0007661B1
EP0007661B1 EP79200376A EP79200376A EP0007661B1 EP 0007661 B1 EP0007661 B1 EP 0007661B1 EP 79200376 A EP79200376 A EP 79200376A EP 79200376 A EP79200376 A EP 79200376A EP 0007661 B1 EP0007661 B1 EP 0007661B1
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EP
European Patent Office
Prior art keywords
piston
bearing
ring
gripped
rib
Prior art date
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Expired
Application number
EP79200376A
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German (de)
French (fr)
Other versions
EP0007661A1 (en
Inventor
Horst Dr. Ing. Moebus
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.)
Kolbenschmidt AG
Original Assignee
Kolbenschmidt AG
Karl Schmidt GmbH
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Filing date
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Application filed by Kolbenschmidt AG, Karl Schmidt GmbH filed Critical Kolbenschmidt AG
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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
    • F02F3/18—Pistons  having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
    • 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 
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to a built, liquid-cooled piston for internal combustion engines, in particular for medium-speed diesel engines, the lower part of which consists of a eutectic aluminum-silicon alloy and which is connected to the upper part made of an iron material by means of screws and in which a concentrically extending part on the underside of the upper part , is arranged on an opposite support surface of the lower part via a concentric arranged intermediate ring made of a ferrous support collar such that the support collar and the intermediate ring both the radial inner boundary of the annular cooling channel located in the upper part in the area behind the top land and at least part of the ring section form as well as include a central, upwardly open cooling space connected to the cooling channel via radially arranged coolant bores.
  • Cast or forged steel is a suitable material for the piston head, as is nodular cast iron with its strength values similar to those of steel.
  • the piston lower part which consists of a shaft and a pin hub, can be made of a cast or forged aluminum piston alloy. Both components are connected to each other via tie rods or screws.
  • Such two-part pistons all require cooling, preferably by means of a cooling oil.
  • This object is achieved in that the intermediate ring is clamped between the support surface of the support collar and the opposite support surface of the lower part and in that the mutually opposite support surfaces of the support collar and intermediate ring are designed such that they can be rolled over one another over the entire circumference or the opposite support surfaces with a circular cross section are designed to slide are supported on each other.
  • one or both of the opposing contact surfaces of the support collar and intermediate ring can be hardened, chrome-plated, nitrided or surface-treated in some other way.
  • the intermediate ring In order to center the intermediate ring, it is either inserted in a concentric recess in the lower piston part or provided on its lower inner or outer edge with a circumferential centering lug which rests on a concentric recess in the lower piston part.
  • the intermediate cross section of the intermediate ring can be rectangular, trapezoidal or similar.
  • its axially extending side surfaces can be concave.
  • An internal combustion engine piston in which a cross-sectionally fork-shaped intermediate ring is arranged between the steel upper part and the light metal lower part, the foot part of which is screwed to the lower part and the fork part of which is screwed to the upper part (DE-R-2 230 722 and US-A-3 877 351).
  • this piston is only about a favorable arrangement of the screw elements connecting the individual components.
  • FIG 3 shows a section of a longitudinal section through the upper part of a piston formed from an upper part 10 made of spheroidal graphite cast iron and a lower part 11 made from an aluminum piston alloy.
  • the trapezoidal steel intermediate ring 15 is clamped between the support surface 12 of the support collar 13, which is circular in cross section, and the support surface 14 of the lower part 11, the centering nose 16 arranged on its lower outer edge abutting the recess 17 of the lower piston part 11.
  • the bearing surface 12 of the support collar 13, which is circular in cross-section, is supported in a sliding manner on the opposite bearing surface 18 of the intermediate ring 15, which is in the form of a circular cross section.
  • the cooling channel and the cooling space are connected to one another via the coolant bores 21 and 22, respectively.
  • the advantages achieved by the invention are that no wear and tear can be detected on the bearing surface of the lower piston part even after a comparatively long piston life.

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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 bezieht sich auf einen gebauten, flüssigkeitsgekühlten Kolben für Brennkraftmaschinen, insbesondere für mittelschnellaufende Dieselmotoren, dessen aus einer eutektischen Aluminium-Silizium-Legierung bestehendes Unterteil mit dem aus einem Eisenwerkstoff bestehendes Oberteil über Schrauben verbunden und bei dem auf der Unterseite des Oberteils ein konzentrisch verlaufender, an einer gegenüberliegenden Auflagefläche des Unterteils über einen aus einem Eisenwerkstoff bestehenden konzentrisch angeordneten Zwischenring anliegender Abstützbund derart angeordnet ist, daß der Abstützbund und den Zwischenring sowohl die radiale innere Begrenzung des im Oberteil im Bereich hinter dem Feuersteg und wenigstens einem Teil der Ringpartie befindlichen ringförmigen Kühlkanals bilden als auch einen zentralen, mit dem Kühlkanal über radial angeordnete Kühlmittelbohrungen verbundenen, nach oben offenen Kühlraum einschließen.The invention relates to a built, liquid-cooled piston for internal combustion engines, in particular for medium-speed diesel engines, the lower part of which consists of a eutectic aluminum-silicon alloy and which is connected to the upper part made of an iron material by means of screws and in which a concentrically extending part on the underside of the upper part , is arranged on an opposite support surface of the lower part via a concentric arranged intermediate ring made of a ferrous support collar such that the support collar and the intermediate ring both the radial inner boundary of the annular cooling channel located in the upper part in the area behind the top land and at least part of the ring section form as well as include a central, upwardly open cooling space connected to the cooling channel via radially arranged coolant bores.

Für hohe und höchste Belastung ist ein Einsatz solcher zweiteiliger Kolben unumgänglich, die in verschiedenen Kombinationen herstellbar sind. Als Werkstoff für den Kolbenkopf bietet sich gegossener oder geschmiedeter Stahl an, ebenso Sphäroguß mit seinen dem Stahl ähnlichen Festigkeitswerten. Das aus Schaft und Bolzennabe bestehende Kolbenunterteil kann aus einer gegossenen oder geschmiedeten Aluminium-Kolbenlegierung sein. Beide Bauteile sind über Zuganker oder Schrauben miteinander verbunden. Solche zweiteiligen Kolben verlangen alle eine Kühlung, vorzugsweise mittels eines Kühlöls.For high and highest loads, it is essential to use two-part pistons that can be manufactured in various combinations. Cast or forged steel is a suitable material for the piston head, as is nodular cast iron with its strength values similar to those of steel. The piston lower part, which consists of a shaft and a pin hub, can be made of a cast or forged aluminum piston alloy. Both components are connected to each other via tie rods or screws. Such two-part pistons all require cooling, preferably by means of a cooling oil.

Seit der Verwendung zweiteiliger Kolben, deren Oberteil aus Stahl oder Sphäroguß und deren Unterteil aus einer Aluminium-Kolbenlegierung bestehen, sind zwischen Kolbenoberteil und Kolbenunterteil an der Auflagefläche des Abstützbundes am Kolbenunterteil Verschleißerscheinungen zu beobachten, die insbesondere im Außenbereich der Auflagefläche und um die Spannschrauben herum auftreten. Dieser Verschleiß wird durch radiale und axiale Bewegungen der in der Verbindungsebene gegeneinanderliegenden Auflageflächen der beiden Kolbenbauteile verursacht. Diese Bewegungen, die durch den durch die Deformation des Kolbenoberteils infolge Temperatur und Gasdruck bewirkten Krempeleffekt hervorgerufen werden, bewirken nicht nur einen Verschleiß, sondern beinhalten auch die Gefahr einer plastischen Deformation des Kolbenunterteils mit nachfolgender Rißbildung und Materialabscherung in sich. Darüber hinaus nähern sich bei der plastischen Deformation die Auflageflächen der beiden Kolbenbauteile, wodurch die Verspannung der Schrauben bzw. Zuganker herabgesetzt wird.Since the use of two-part pistons, the upper part of which is made of steel or nodular cast iron and the lower part of which is made of an aluminum piston alloy, signs of wear have been observed between the upper part of the piston and the lower part of the piston on the supporting surface of the support collar on the lower part of the piston, which occur particularly in the outer area of the supporting surface and around the clamping screws . This wear is caused by radial and axial movements of the bearing surfaces of the two piston components lying opposite one another in the connecting plane. These movements, which are caused by the carding effect caused by the deformation of the upper piston part as a result of temperature and gas pressure, not only cause wear, but also involve the risk of plastic deformation of the lower piston part with subsequent cracking and material shearing off. In addition, the contact surfaces of the two piston components approach during the plastic deformation, as a result of which the tensioning of the screws or tie rods is reduced.

Es ist die Aufgabe der vorliegenden Erfindung, den Kolben so zu gestalten, daß auch nach vergleichsweise langen Kolbenlaufzeiten kein merkbarer Verschleiß und/oder eine Deformation im Bereich der Auflagefläche des Kolbenunterteils erkennbar sind.It is the object of the present invention to design the piston in such a way that no noticeable wear and / or deformation in the region of the bearing surface of the lower piston part can be detected even after a comparatively long piston life.

Gelöst ist diese Aufgabe dadurch, daß der Zwischenring zwischen der Auflagefläche des Abstützbundes und der gegenüberliegenden Auflagefläche des Unterteils eingeklemmt ist und daß die einander gegenüberliegenden Auflageflächen von Abstützbund und Zwischenring über den gesamten Umfang aufeinander abwälzbar gestaltet oder die einander gegenüberliegenden, im Querschnitt kreisabschnittförmig gestalteten Auflageflächen gleitend aufeinander abgestützt sind.This object is achieved in that the intermediate ring is clamped between the support surface of the support collar and the opposite support surface of the lower part and in that the mutually opposite support surfaces of the support collar and intermediate ring are designed such that they can be rolled over one another over the entire circumference or the opposite support surfaces with a circular cross section are designed to slide are supported on each other.

Durch diese Maßnahme laufen die durch Temperatur und Gasdruck hervorgerufenen Bewegungen im Bereich der von Abstützbund und Zwischenring gebildeten Verbindungsebene ab, so daß an der Auflagefläche des aus einer Aluminium-Kolbenlegierung bestehenden Kolbenunterteils keine Verschleißerscheinungen bzw. Deformationen verursacht werden können.As a result of this measure, the movements caused by temperature and gas pressure take place in the area of the connecting plane formed by the support collar and the intermediate ring, so that no signs of wear or deformations can be caused on the contact surface of the lower piston part made of an aluminum piston alloy.

Dabei ist es möglich, die Größe der Krümmung der einander gegenüberliegenden Auflageflächen voneinander abweichend zu gestalten, um so bei steigender Belastung weitere Bereiche als wirksame Auflagefläche zu erfassen und damit den Aufbau der spezifischen Flächenpressung zu steuern.It is possible to deviate the size of the curvature of the opposing support surfaces from one another in order to detect further areas as an effective support surface as the load increases and thus to control the build-up of the specific surface pressure.

Als zusätzliche Maßnahme zur Erhöhung des Verschleißwiderstandes können eine oder beide der gegeneinanderliegenden Auflageflächen von Abstützbund und Zwischenring gehärtet, verchromt, nitriert oder in anderer Weise oberflächenbehandelt sein.As an additional measure to increase the wear resistance, one or both of the opposing contact surfaces of the support collar and intermediate ring can be hardened, chrome-plated, nitrided or surface-treated in some other way.

Um den Zwischenring zu zentrieren, ist dieser entweder in einer im Kolbenunterteil angebrachten konzentrischen Eindrehung eingesetzt oder an seiner unteren Innen- bzw. Außenkante mit einer umlaufenden Zentriernase versehen, die an einer konzentrischen Eindrehung des Kolbenunterteils anliegt. Der Zwischenring kann in seinem wesentlichen Querschnitt rechteckig, trapezförmig oder ähnlich gestaltet sein. Zusätzlich können seine axial verlaufenden Seitenflächen konkav sein.In order to center the intermediate ring, it is either inserted in a concentric recess in the lower piston part or provided on its lower inner or outer edge with a circumferential centering lug which rests on a concentric recess in the lower piston part. The intermediate cross section of the intermediate ring can be rectangular, trapezoidal or similar. In addition, its axially extending side surfaces can be concave.

Bekannt ist zwar ein Brennkraftmaschinenkolben, bei dem zwischen dem aus Stahl bestehenden Oberteil und dem aus Leichtmetall bestehenden Unterteil ein im Querschnitt gabelförmiger Zwischenring angeordnet ist, dessen Fußteil mit dem Unterteil und dessen Gabelteil mit dem Oberteil verschraubt sind (DE-R-2 230 722 und US-A-3 877 351). Bei diesem Kolben geht es jedoch nur um eine günstige Anordnung der die einzelnen Bauteile miteinander verbindenden Schraubelemente.An internal combustion engine piston is known in which a cross-sectionally fork-shaped intermediate ring is arranged between the steel upper part and the light metal lower part, the foot part of which is screwed to the lower part and the fork part of which is screwed to the upper part (DE-R-2 230 722 and US-A-3 877 351). However, this piston is only about a favorable arrangement of the screw elements connecting the individual components.

Die Erfindung ist in den nachfolgend erläuterten Zeichnungen beispielhaft dargestellt:

  • Bei dem in Fig. 1 ausschnittsweise dargestellten Längsschnitt durch den oberen Bereich eines aus einem Stahloberteil 1 und einem aus einer Aluminium-Kolbenlegierung bestehenden Unterteil 2 gebildeten Kolbens, ist zwischen der planparallel verlaufenden Auflagefläche 3 des Abstütztbundes 4 und der planparallel verlaufenden Auflagefläche 5 des Unterteils 2 ein über die an seiner unteren Innenkante befindliche, an der Eindrehung 9 anliegende Zentriernase 6 konzentrisch eingesetzter trapezförmiger Zwischenring 7 eingeklemmt. Die der Auflagefläche 3 gegenüberliegende Auflagefläche 8 des Stahlzwischenrings 7 ist ballig gekrümmt und auf der Auflagefläche 3 abwälzbar. Dieser Kolben kann in der Weise abgewandelt sein, daß die einander gegenüberliegenden, im Querschnitt kreisabschnittförmig gestalteten Auflageflächen 3, 8 des Zwischenrings 7 und des Abstützbundes 4 gleitend aufeinander abgestützt sind (Fig. 2).
The invention is illustrated by way of example in the drawings explained below:
  • In the detail shown in Fig. 1 th longitudinal section through the upper region of a piston formed from a steel upper part 1 and a lower part 2 consisting of an aluminum piston alloy, is a between the plane-parallel bearing surface 3 of the support collar 4 and the plane-parallel bearing surface 5 of the lower part 2 over the at its lower inner edge located, located at the recess 9 centering nose 6 concentrically inserted trapezoidal intermediate ring 7. The support surface 8 of the steel intermediate ring 7 opposite the support surface 3 is curved in a crowned manner and can be rolled on the support surface 3. This piston can be modified in such a way that the opposing, cross-sectional bearing surfaces 3, 8 of the intermediate ring 7 and the support collar 4 are slidably supported on each other (Fig. 2).

In Fig. 3 ist ein Ausschnitt eines Längsschnitts durch den oberen Teil eines aus einem aus Gußeisen mit Kugelgraphit bestehenden Oberteils 10 und eines aus einer Aluminium-Kolbenlegierung bestehenden Unterteils 11 gebildeten Kolbens wiedergegeben. Zwischen der im Querschnitt kreisabschnittförmigen Auflagefläche 12 des Abstützbundes 13 und der Auflagefläche 14 des Unterteils 11 ist der trapezförmige Stahlzwischenring 15 eingeklemmt, wobei die an seiner unteren Außenkante angeordnete Zentriernase 16 an der Eindrehung 17 des Kolbenunterteils 11 anliegt. Die im Querschnitt kreisabschnittförmige Auflagefläche 12 des Abstützbundes 13 stützt sich gleitend auf der gegenüberliegenden, im Querschnitt kreisabschnittförmig gestalteten Auflagefläche 18 des Zwischenrings 15 ab. Der Kühlkanal und der Kühlraum sind über die Kühlmittelbohrungen 21 bzw. 22 miteinander verbunden.3 shows a section of a longitudinal section through the upper part of a piston formed from an upper part 10 made of spheroidal graphite cast iron and a lower part 11 made from an aluminum piston alloy. The trapezoidal steel intermediate ring 15 is clamped between the support surface 12 of the support collar 13, which is circular in cross section, and the support surface 14 of the lower part 11, the centering nose 16 arranged on its lower outer edge abutting the recess 17 of the lower piston part 11. The bearing surface 12 of the support collar 13, which is circular in cross-section, is supported in a sliding manner on the opposite bearing surface 18 of the intermediate ring 15, which is in the form of a circular cross section. The cooling channel and the cooling space are connected to one another via the coolant bores 21 and 22, respectively.

Unterschiedlich zu Fig. 3 ist, in Fig. 4 der zwischen dem Abstützbund 13 und dem Unterteil 11 eingeklemmte Zwischenring 19 in eine Eindrehung 20 des Unterteils 11 eingesetzt.Different from FIG. 3, in FIG. 4 the intermediate ring 19 clamped between the support collar 13 and the lower part 11 is inserted into a recess 20 of the lower part 11.

Die mit der Erfindung erzielten Vorteile bestehen darin, daß an der Auflagefläche des Kolbenunterteils keine Verschleißerscheinungen auch nach vergleichsweise langer Kolbenlaufzeit feststellbar sind.The advantages achieved by the invention are that no wear and tear can be detected on the bearing surface of the lower piston part even after a comparatively long piston life.

Claims (6)

1. A liquid-cooled, composite piston für internal-combustion engines, particularly for medium-speed diesel engines, comprising a lower part (2, 11), which consists of an eutectic aluminium-silicon alloy and is connected by screws to an upper part (1, 10) consisting of ferrous material, wherein the upper part (1, 10) is formed on its underside with a concentric bearing rib (4, 13), which bears on the opposite bearing sufrace (5,14) of the lower part (2, 11) by the provision of a ring (7, 15, 19), which consists of ferrous material and is concentrically gripped between the bearing surface (3, 12) of the bearing rib (4, 13) and the opposite bearing surface (5, 14) of the lower part (2, 11) of the piston and is so arranged that the rib (4, 13) and the ring (7, 15, 19) constitutes the radially inner boundary of the annular cooling channel, which is disposed in the upper part (1, 10) behind the top land and behind at least part of the ring-carrying partion and is open to the interfacial plane, and also defines a central cooling chamber, which is disposed in the upper part (1, 10) and which communicates with the cooling channel by radial coolant bores (21, 22) an is open to the interfacial plane, characterized by an arrangement in which the confronting bearing surfaces of the bearing rib (4,13) and the gripped ring (7, 15, 19) are so designed that they can peripherally roll on each other.
2. A piston according to claim 1, characterized in that the bearing surface (8, 18) which faces the outwardly curved bearing surface (3, 12) of the bearing rib (4, 13) or the gripped ring (7, 15, 19) has a corresponding concavity.
3. A piston according to claim 1, characterized in that the curvatures of the two bearing surfaces (3,12, 8,18) differ in size.
4. A piston according to any of claims 1 to 3, characterized in that the gripped ring (7,15,19) is inserted in a concentric turned recess (20) in the lower part (11) of the piston.
5. A piston according to any of claims 1 to 3, characterized in that the gripped ring (7, 15, 19) is provided at its inner or outer, lower edge with a peripheral annular centering nose (6, 16), which engages a concentric turned recess (9,17) of the lower part of the piston.
6. A piston according to any of claims 1 to 5, characterized in that at least one of the confronting bearing surfaces (3, 12, 8, 18) of the bearing rib (4, 13) and the gripped ring (7, 15, 19) has been surface-treated by hardening, chromium-plating, nitriding or the like.
EP79200376A 1978-07-27 1979-07-09 Assembled internal combustion engine piston having liquid cooling means Expired EP0007661B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782832970 DE2832970A1 (en) 1978-07-27 1978-07-27 BUILT LIQUID-COOLED PISTON FOR INTERNAL COMBUSTION ENGINES
DE2832970 1978-07-27

Publications (2)

Publication Number Publication Date
EP0007661A1 EP0007661A1 (en) 1980-02-06
EP0007661B1 true EP0007661B1 (en) 1981-09-23

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EP79200376A Expired EP0007661B1 (en) 1978-07-27 1979-07-09 Assembled internal combustion engine piston having liquid cooling means

Country Status (5)

Country Link
US (1) US4356800A (en)
EP (1) EP0007661B1 (en)
JP (2) JPS5519999A (en)
DE (2) DE2832970A1 (en)
ES (1) ES244842Y (en)

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EP0985739A1 (en) * 1998-09-10 2000-03-15 MMS Marine Motor Service Method of hardening piston crowns and piston crown
DE102006055251A1 (en) * 2006-11-23 2008-05-29 Mahle International Gmbh Two-piece piston for an internal combustion engine

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WO1983002300A1 (en) * 1981-12-28 1983-07-07 Alco Power Inc Prestressed composite piston
DE3303984C1 (en) * 1983-02-05 1984-05-24 Mahle Gmbh, 7000 Stuttgart Multi-part, liquid-cooled piston for internal combustion engines
DE3423559C1 (en) * 1984-06-27 1985-09-26 Mahle Gmbh, 7000 Stuttgart Multi-part plunger for internal combustion engines
DE3540085A1 (en) * 1985-11-12 1987-05-14 Alcan Aluminiumwerke PISTON FOR INTERNAL COMBUSTION ENGINES
DE3633134A1 (en) * 1986-09-30 1988-04-07 Man B & W Diesel Gmbh Built piston for internal combustion engines
GB8714287D0 (en) * 1987-06-18 1987-07-22 Ae Plc Pistons
US5040454A (en) * 1988-10-21 1991-08-20 Caterpillar Inc. Piston assembly and piston member thereof having a predetermined compression height to diameter ratio
BR9005370A (en) * 1990-10-18 1992-06-16 Metal Leve Sa COOLED PUMP MANUFACTURING PROCESS
DE4129746C2 (en) * 1991-09-06 1994-04-14 Man B & W Diesel Ag Built pistons for reciprocating machines
US5499572A (en) * 1993-08-26 1996-03-19 Cobble; Daniel L. Bi-tech piston
DE19846152A1 (en) * 1998-10-07 2000-04-13 Mahle Gmbh Piston with piston base made of forged steel and a cooling channel
DE60028800T3 (en) 1999-10-08 2018-06-21 Federal-Mogul Corp. PISTON WITH TWO COOLANT CHANNELS
DE10028926A1 (en) * 2000-06-10 2001-12-13 Mahle Gmbh Piston, has base with cone shaped or round surface sitting tightly on top of bottom part of piston or intermediate piece
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Also Published As

Publication number Publication date
ES244842U (en) 1979-11-16
ES244842Y (en) 1980-05-16
JPS5756060Y2 (en) 1982-12-03
EP0007661A1 (en) 1980-02-06
JPS6339779B2 (en) 1988-08-08
JPS5519999U (en) 1980-02-07
DE2960891D1 (en) 1981-12-10
DE2832970A1 (en) 1980-02-07
US4356800A (en) 1982-11-02
JPS5519999A (en) 1980-02-13

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