DE898827C - Oval internal combustion engine piston, in particular light metal piston - Google Patents

Oval internal combustion engine piston, in particular light metal piston

Info

Publication number
DE898827C
DE898827C DEM9802A DEM0009802A DE898827C DE 898827 C DE898827 C DE 898827C DE M9802 A DEM9802 A DE M9802A DE M0009802 A DEM0009802 A DE M0009802A DE 898827 C DE898827 C DE 898827C
Authority
DE
Germany
Prior art keywords
piston
combustion engine
internal combustion
light metal
particular light
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.)
Expired
Application number
DEM9802A
Other languages
German (de)
Inventor
Fritz Hammersdorf
Erhardt Schmitt
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
Priority to DEM9802A priority Critical patent/DE898827C/en
Application granted granted Critical
Publication of DE898827C publication Critical patent/DE898827C/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • 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
    • F02F3/022—Pistons  having means for accommodating or controlling heat expansion the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval

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)

Description

Die Erfindung betrifft einen ovalen, insbesondere aus Leichtmetall bestehenden Brennkraftmaschinenkolben mit längs geschlitzten und durch Querschlitze gegenüber dem Kolbenkopf beweglich gemachten Manteltragflächen sowie mit in dem längs geschlitzten Mantelteil .derart eingebetteten (z. B. eingegossenen) gelenkbildenden Elementen mit kreisrundem Querschnitt, daß - deren Außenfläche sich formschlüssig in den Mantel einfügt.The invention relates to an oval, in particular made of light metal existing internal combustion engine pistons with longitudinally slotted and transverse slits with respect to the piston head made movable lateral support surfaces as well as in the Longitudinally slotted casing part embedded in this way (e.g. cast-in) joint-forming Elements with a circular cross-section that - the outer surface of which is form-fitting inserts into the coat.

Bei einer bekannten derartigen Kolbenausführung bestehen die gelenkbildenden Elemente aus geschlitzten Hülsen, welche als Spreizfedern wirken, die die geschlitzten Mantelteile abstützen und am Einfallen verhindern.In a known piston design of this type, the joint-forming ones exist Elements made of slotted sleeves, which act as expanding springs, which the slotted Support shell parts and prevent them from collapsing.

Der Erfindung liegt die Erkenntnis zugrunde, daß eine elastische Abstützung schon durch die Gelenkwirkung solcher Elemente auch dann gewährleistet ist, wenn die gelenkbildenden Elemente nicht in sich selbst federnd ausgebildet sind.The invention is based on the knowledge that an elastic support the joint action of such elements also guarantees if the joint-forming elements are not inherently resilient.

Es wird daher erfindungsgemäß vorgeschlagen, die formschlüssig in dem längs geschlitzten Mantelteil eines Kolbens der eingangs beschriebenen Art eingefügten Elemente aus einer urigeschlitzten Hülse oder Walze zu bilden.It is therefore proposed according to the invention that the form-fitting in inserted into the longitudinally slotted casing part of a piston of the type described above To form elements from a traditionally slotted sleeve or roller.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes in Fig. i in Ansicht und in Fig. 2 im Querschnitt dargestellt.The drawing shows an embodiment of the subject matter of the invention shown in Fig. i in view and in Fig. 2 in cross section.

Es handelt sich hierbei um einen sogenannten T-iSchlitzkolben, bei dem der Mantel i vom Kopfteil 2 durch zwei Ouerschlitze 3 teilweise abgetrennt ist und bei dem außerdem die eine Tragfläche des Mantels einen Längsschlitz 4 aufweist. Im Bereich dieses Schlitzes 4 ist der Mantel i wulstartig verstärkt, und in den Wulst ist eine zylindrische Hülse 5 eingegossen.This is a so-called T-i slotted flask the jacket i is partially separated from the head part 2 by two Ouerschlitze 3 and in which, in addition, the one supporting surface of the casing has a longitudinal slot 4. In the area of this slot 4, the jacket i is reinforced in the manner of a bead, and in the A cylindrical sleeve 5 is cast in the bead.

Gegen diese Hülse stützen sich die den Längsschlitz begrenzenden Kanten schon bei Zimmertemperatur gegeneinander ab, die Wärmedehnung des Mantels kann also nicht durch entsprechende Schließung des Schlitzes kompensiert werden. Die dem Längsschlitz benachbarten Mantelteile können aber dem Gegendruck der Zylinderlaufbahn gelenkig ausweichen. Die auftretenden Kräfte wirken sich auf dem Kolbenmantel tangential, d. h. in Richtung der Bolzenachse aus und unterstützen dadurch die bei allen quer geschlitzten Kolben schon an sich vorhandene Tendenz zur vorzugsweisen Dehnung in dieser Richtung, in der sie wegen der vorgesehenen Schaftovalität unschädlich ist. Infolgedessen ist es möglich, in der. quer zur Bolzenachse gerichteten Durchmesserebene noch wesentlich kleinere Einbauspiele vorzusehen als bei allen vorbekannten Schlitzmantelkolbenbauarten.The edges delimiting the longitudinal slot are supported against this sleeve already at room temperature against each other, so the thermal expansion of the jacket can cannot be compensated for by closing the slot accordingly. The one in the longitudinal slot adjacent shell parts can, however, be articulated to the counterpressure of the cylinder liner evade. The forces that occur act tangentially on the piston skirt, d. H. in the direction of the bolt axis and thereby support the transversal slotted piston already has a tendency towards preferential elongation in this direction, in which it is harmless due to the intended ovality of the shaft. As a result, it is possible in the. Diameter plane directed transversely to the bolt axis still provide significantly smaller installation clearances than with all known slotted jacket piston designs.

Claims (1)

PATENTANSPRUCH: Ovaler Brennkraftmaschinenkolben, insbesondere Leichtmetallkolben, mit längs geschlitzten und durch Querschlitze gegenüber dem Kolbenkopf beweglich gemachten Manteltragflächen, wobei gelenkbildende Elemente mit kreisrundem Querschnitt, z. B. in Form von zylindrischen Hülsen, in den längs geschlitzten Mantelteil derart eingebettet, z. B. eingegossen sind, daß ihre Außenfläche sich formschlüssig in den Mantel einfügt, dadurch gekennzeichnet, daß das formschlüssig in dem Mantelteil eingebettete Element aus einer urigeschlitzten Hülse oder Walze besteht. Angezogene Druckschriften: USA.-Patentschriften Nr. 2 167 287, :2-218 737; deutsche Patentschrift Nr. 863 273.PATENT CLAIM: Oval internal combustion engine piston, in particular light metal piston, with longitudinally slotted and movable through transverse slits in relation to the piston head made shell wings, with joint-forming elements with a circular cross-section, z. B. in the form of cylindrical sleeves, in the longitudinally slotted shell part in such a way embedded, e.g. B. are poured in that their outer surface is positively locked in inserts the jacket, characterized in that the form-fitting in the jacket part embedded element consists of a rustic slotted sleeve or roller. Dressed References: U.S. Patent Nos. 2,167,287,: 2-218,737; German patent specification No. 863 273.
DEM9802A 1951-06-08 1951-06-08 Oval internal combustion engine piston, in particular light metal piston Expired DE898827C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM9802A DE898827C (en) 1951-06-08 1951-06-08 Oval internal combustion engine piston, in particular light metal piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM9802A DE898827C (en) 1951-06-08 1951-06-08 Oval internal combustion engine piston, in particular light metal piston

Publications (1)

Publication Number Publication Date
DE898827C true DE898827C (en) 1953-12-03

Family

ID=7294854

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM9802A Expired DE898827C (en) 1951-06-08 1951-06-08 Oval internal combustion engine piston, in particular light metal piston

Country Status (1)

Country Link
DE (1) DE898827C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011042264A1 (en) * 2009-10-07 2011-04-14 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine, and internal combustion engine having a piston

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167287A (en) * 1934-02-10 1939-07-25 Leon A Witter Piston skirt expander
US2218737A (en) * 1939-04-03 1940-10-22 Hastings Mfg Co Piston skirt expander
DE863273C (en) * 1951-03-13 1953-01-15 Mahle Kg Internal combustion engine pistons made of light metal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167287A (en) * 1934-02-10 1939-07-25 Leon A Witter Piston skirt expander
US2218737A (en) * 1939-04-03 1940-10-22 Hastings Mfg Co Piston skirt expander
DE863273C (en) * 1951-03-13 1953-01-15 Mahle Kg Internal combustion engine pistons made of light metal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011042264A1 (en) * 2009-10-07 2011-04-14 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine, and internal combustion engine having a piston

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