DE3733601A1 - Light alloy piston for internal combustion engines - Google Patents

Light alloy piston for internal combustion engines

Info

Publication number
DE3733601A1
DE3733601A1 DE19873733601 DE3733601A DE3733601A1 DE 3733601 A1 DE3733601 A1 DE 3733601A1 DE 19873733601 DE19873733601 DE 19873733601 DE 3733601 A DE3733601 A DE 3733601A DE 3733601 A1 DE3733601 A1 DE 3733601A1
Authority
DE
Germany
Prior art keywords
piston
internal combustion
combustion engines
reinforcement part
light alloy
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Withdrawn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
DE19873733601
Other languages
German (de)
Inventor
Eberhard Bubeck
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 DE19873733601 priority Critical patent/DE3733601A1/en
Publication of DE3733601A1 publication Critical patent/DE3733601A1/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Withdrawn legal-status Critical Current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 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • F02F3/04—Pistons  having means for accommodating or controlling heat expansion having expansion-controlling inserts
    • F02F3/08—Pistons  having means for accommodating or controlling heat expansion having expansion-controlling inserts the inserts being ring-shaped
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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)

Abstract

In order to be able to make the fire land clearance very small and, in particular, to prevent incipient recess edge cracks in the pin direction on the combustion chamber recess (2) in a light alloy piston for internal combustion engines, especially diesel engines with a combustion chamber recess (2) provided in the piston head (7), a reinforcing part (10) which almost completely covers the fire land (5) and is non-positively connected to the piston (1) is provided on the piston (1). <IMAGE>

Description

Die Erfindung betrifft einen Kolben aus Leichtmetall für Verbrennungsmotoren nach dem Oberbegriff des An­ spruchs 1.The invention relates to a piston made of light metal for internal combustion engines according to the preamble of An saying 1.

Aus der DE-OS 35 27 447 ist ein Kolben aus Leichtme­ tall für Verbrennungsmotoren bekannt, bei dem zur Steuerung der Wärmedehnung im Kolbenkopf eine ge­ schlossene, hülsenförmige Einlage aus einem Metall von geringerer Wärmeausdehnung als das Kolbengrundma­ terial im Vollmaterial des Kolbenkopfes angeordnet ist. Diese Einlage soll in Bereichen senkrecht zur Kolbenbolzen-Richtung - also in Druck-Gegendruckrich­ tung - zum Teil frei nach außen münden, so daß insge­ samt ein Regeleffekt erreicht wird, wie er durch Vor­ sehen von dehnungsregelnden Einlagen im Kolbenschaft vom Kolbenschaft her bekannt ist. Nachteilig an die­ ser Kolbenausführung ist, daß das Kolbenmaterial in den Bereichen, in denen es freigelegt ist, sich unge­ hindert ausdehnen kann, wodurch das Kolbenspiel nicht optimal gewählt werden kann.From DE-OS 35 27 447 a piston from Leichtme tall is known for internal combustion engines, in which a closed, sleeve-shaped insert made of a metal of lower thermal expansion than the piston material is arranged in the solid material of the piston head to control the thermal expansion in the piston head. This insert is intended to perpendicular in areas to the piston pin direction - ie in the pressure-counterpressure Rich tung -, so that IMP EXP achieved together with a regulating effect, as seen by on strain-regulating inserts in the piston stem from the piston shaft is known in part freely open to the outside. A disadvantage of this piston design is that the piston material can expand unhindered in the areas in which it is exposed, which means that the piston play cannot be optimally selected.

Aufgabe der Erfindung ist daher, einen Kolben zu fin­ den, dessen Feuerstegspiel sehr klein zu gestalten ist und bei dem insbesondere Muldenrandanrisse in Bolzenrichtung an der im Kolbenboden vorgesehenen Brennraummulde vermieden werden. The object of the invention is therefore to fin a piston to make his, the top land game very small is and in particular trough edge cracks in Pin direction on the provided in the piston crown Combustion chamber trough can be avoided.  

Gelöst wird diese Aufgabe erfindungsgemäß durch einen Kolben mit den kennzeichnenden Merkmalen des An­ spruchs 1.According to the invention, this object is achieved by a Piston with the characteristic features of the An saying 1.

Weitere Ausgestaltungen der Erfindung sind in den Un­ teransprüchen enthalten. Durch das Vorsehen eines den Feuersteg des Kolbens fast vollständig abdeckenden Bewehrungsteils aus einem Metall von geringerer Wär­ meausdehnung als das Kolbengrundmaterial, das mit dem Kolben kraftschlüssig verbunden ist, wird auf kon­ struktiv einfache Weise ein Kolben erhalten, der im Kolbenkopfbereich durch sein geringeres Ausdehnungs­ verhalten ein sehr kleines Feuerstegspiel erlaubt und bei dem durch Abbau von Spannungen durch Vorspannung in Bolzen-Richtung, insbesondere am Muldenrand, in diesem Bereich auftretende Muldenrandanrisse vermie­ den werden. Außerdem zeigt der für das Bewehrungsteil verwendete Eisen-Werkstoff ein besseres Anlaufverhal­ ten an der Zylinderwand als das für den Kolben übli­ cherweise verwendete Leichtmetall aus einer Al-Legie­ rung.Further refinements of the invention are in the Un claims included. By providing one The piston top land almost completely covering Reinforcement part made of a metal of lower heat expansion as the piston base material, which with the Piston is non-positively connected to con structurally simple way to get a piston that in Piston head area due to its smaller expansion behavior allows a very small top land game and in which by relieving tension by preloading in the direction of the bolt, especially at the edge of the trough, in Avoid trough edge cracks occurring in this area that will. It also shows for the reinforcement part used iron material better starting behavior ten on the cylinder wall than that for the piston Usually used aluminum alloy tion.

Ein Ausführungsbeispiel wird nachfolgend anhand der Zeichnung näher beschrieben.An embodiment is described below with reference to Drawing described in more detail.

Ein Kolben 1 aus einer Aluminium-Legierung für einen Diesel-Direkteinspritzer-Motor weist eine zentrale Brennraummulde 2 auf. Eine Ringnut 3 für einen Ver­ dichtungsring ist durch einen Ringträger 4 bewehrt. Im Feuersteg 5 des Kolbens 1 ist eine Nut 6 vorgese­ hen, die an ihrem dem Kolbenboden 7 zugewandten Ende 8 durch Ausbildung eines Rücksprunges 9 des Feuerste­ ges 5 eine geringere Tiefe aufweist, als an ihrem der Ringnut 3 zugewandten entgegengesetzten Ende. Ein ringförmiges Bewehrungsteil 10 aus Stahl umfaßt den Kolbenkopf im Bereich des Feuerstegs 5 in der Nut 6 liegend unter Vorspannung. Bei der Montage wird das Bewehrungsteil 10 erhitzt und auf den unterkühlten Al-Kolben aufgezogen, so daß es durch Aufschrumpfen in die Nut 6 des Feuersteges 5 mit dem Kolben 1 kraft- und formschlüssig verbunden ist. Der Außen­ durchmesser des Bewehrungsteils 10 ist so gewählt, daß nach Aufschrumpfen das Bewehrungsteil 10 mit dem verbleibenden Feuersteg 5 und dem Ringträger 4 bündig abschließt.A piston 1 made of an aluminum alloy for a diesel direct-injection engine has a central combustion chamber trough 2 . An annular groove 3 for a sealing ring is reinforced by a ring carrier 4 . In the top land 5 of the piston 1 , a groove 6 is provided, which has a smaller depth at its end 8 facing the piston crown 7 by forming a recess 9 of the top part 5 than at its opposite end facing the annular groove 3 . An annular reinforcement part 10 made of steel encompasses the piston head in the area of the top land 5 lying in the groove 6 under prestress. During assembly, the reinforcement part 10 is heated and mounted on the supercooled Al piston, so that it is non-positively and positively connected to the piston 1 by shrinking into the groove 6 of the top land 5 . The outer diameter of the reinforcement part 10 is selected so that after shrinking the reinforcement part 10 is flush with the remaining top land 5 and the ring carrier 4 .

Claims (3)

1. Kolben aus Leichtmetall für Verbrennungsmotoren, insbesondere Dieselmotoren mit einer im Kolbenbo­ den vorgesehenen Brennraummulde, mit einem seine Wärmedehnung steuernden, in sich geschlossenen Bewehrungsteil aus einem Metall von geringerer Wärmeausdehnung als das Kolbengrundmaterial, dadurch gekennzeichnet, daß das Bewehrungsteil (10) den Feuersteg (5) des Kolbens (1) fast vollständig abdeckt und mit dem Kolben (1) kraftschlüssig verbunden ist.1. Piston made of light metal for internal combustion engines, in particular diesel engines with a combustion chamber trough provided in the piston chamber, with a self-contained reinforcement part which controls its thermal expansion and is made of a metal of lower thermal expansion than the piston base material, characterized in that the reinforcement part ( 10 ) supports the top land ( 5 ) of the piston ( 1 ) almost completely covers and is non-positively connected to the piston ( 1 ). 2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß die kraftschlüssige Verbindung durch Auf­ schrumpfen des Bewehrungsteils (10) auf den Kol­ ben (1) erfolgt.2. Piston according to claim 1, characterized in that the positive connection by shrinking on the reinforcement part ( 10 ) on the Kol ben ( 1 ). 3. Kolben nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Bewehrungsteil (10) in einer im Feuersteg (5) vorgesehenen Nut (6) liegend zusätzlich form­ schlüssig mit dem Kolben (1) verbunden ist.3. Piston according to claim 1 or 2, characterized in that the reinforcing part ( 10 ) lying in a groove ( 6 ) provided in the top land ( 5 ) is additionally positively connected to the piston ( 1 ).
DE19873733601 1987-10-05 1987-10-05 Light alloy piston for internal combustion engines Withdrawn DE3733601A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873733601 DE3733601A1 (en) 1987-10-05 1987-10-05 Light alloy piston for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873733601 DE3733601A1 (en) 1987-10-05 1987-10-05 Light alloy piston for internal combustion engines

Publications (1)

Publication Number Publication Date
DE3733601A1 true DE3733601A1 (en) 1989-04-13

Family

ID=6337633

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873733601 Withdrawn DE3733601A1 (en) 1987-10-05 1987-10-05 Light alloy piston for internal combustion engines

Country Status (1)

Country Link
DE (1) DE3733601A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112805463A (en) * 2018-10-08 2021-05-14 辉门汽车零部件有限责任公司 Antiknock piston

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112805463A (en) * 2018-10-08 2021-05-14 辉门汽车零部件有限责任公司 Antiknock piston
CN112805463B (en) * 2018-10-08 2023-10-31 辉门汽车零部件有限责任公司 Antiknock piston

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Legal Events

Date Code Title Description
8141 Disposal/no request for examination