DE2248008A1 - LIGHT ALLOY PISTON FOR AIR COMPRESSING INJECTION COMBUSTION MACHINES - Google Patents

LIGHT ALLOY PISTON FOR AIR COMPRESSING INJECTION COMBUSTION MACHINES

Info

Publication number
DE2248008A1
DE2248008A1 DE19722248008 DE2248008A DE2248008A1 DE 2248008 A1 DE2248008 A1 DE 2248008A1 DE 19722248008 DE19722248008 DE 19722248008 DE 2248008 A DE2248008 A DE 2248008A DE 2248008 A1 DE2248008 A1 DE 2248008A1
Authority
DE
Germany
Prior art keywords
piston
plate
arms
shaped insert
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.)
Pending
Application number
DE19722248008
Other languages
German (de)
Inventor
Heinz Dipl-Ing Hoffmann
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE19722248008 priority Critical patent/DE2248008A1/en
Priority to FR7334671A priority patent/FR2203938A1/fr
Publication of DE2248008A1 publication Critical patent/DE2248008A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02B23/0636—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 the combustion space having a substantially flat and horizontal bottom
    • 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
    • F02B23/0603—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • 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
    • 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
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0654—Thermal treatments, e.g. with heating elements or local cooling
    • 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
    • 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
    • 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)
  • Ceramic Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Daimler-Benz Aktiengesellschaft Daip 966k/k Daimler-Benz Aktiengesellschaft Daip 966k / k Stuttgart-Untertürkheim ' . 28.^ARt^ Λ5Π& Stuttgart-Untertürkheim '. 28. ^ ARt ^ Λ5Π &

Leichtmetallkolben für luftverdichtende EinspritzbrennkraftmaschinenLight alloy pistons for air compressing Internal combustion engines

Die Erfindung bezieht sich auf einen Leichtmetallkolben für luftverdichtende Einspritzbrennkraftmaschinen, insbesondere für Vorkammermaschinen mit direkt gegen den Kolben gerichteter Öffnung der Vorkammer, der mit einem plattenförmigen Einsatz im Kolbenboden versehen ist.The invention relates to a light metal piston for air-compressing injection internal combustion engines, in particular For pre-chamber machines with an opening of the pre-chamber which is directed directly towards the piston and which is provided with a plate-shaped insert in the piston crown.

Insbesondere bei Vorkammerraaschinen, bei denen die Vorkammer als sogenannter Einlochbrenner ausgebildet ist und bei denen die Öffnung der Vorkammer verhältnismäßig nahe am Kolbenboden oder nahe einer im Kolbenboden angeordneten Brennrauounülde liegt, ist das Material des Kolben«» im Bereich der Vorkammeröffnung nicht in jedem Falle den auftretenden thermischen Belastungen gewachsen. Zur Abhilfe wurde in eine entsprechende Ausnehmung im Kolbenboden ein plattenförmiger Einsatz aus einem thermisch beständigen Material eingesetzt, der durch einen Schraubenbolzen und Mutter festgehalten würde. An dieser Anordnung machten die unterschiedlichen Ausdehnungskoeffizienten einen festen Sitz der Schraubverbindung problematisch, so daß DichtSchwierigkeiten auftreten. Ein plattenförmiger Einsatz wurde auch schon eingegossen. Trotzdem konnten Rißbildungen im Kolbenboden nicht verhindert werden. Außerdem war eine feste Bindung zwischen dem Einsatz und dem Kolbenmaterial nur unter größerem Aufwand zu erzielen.Especially with pre-chamber machines where the pre-chamber is designed as a so-called single-hole burner and in which the opening of the antechamber is relatively close to the piston crown or near a combustion bowl arranged in the piston crown is, the material of the piston "" in the area of the prechamber opening is not always able to withstand the thermal loads that occur. To remedy this, a corresponding Recess in the piston head, a plate-shaped insert made of a thermally resistant material is used, which is through a Bolt and nut would be held in place. The different expansion coefficients made on this arrangement a tight fit of the screw connection problematic, so that sealing difficulties arise. A plate-shaped insert has already been poured. Nevertheless, cracks in the piston crown could not be prevented. Besides, it was a solid one Bond between the insert and the piston material just below to achieve greater effort.

* -a -4098U/07I2* -a -4098U / 07I2

- 2 - Palm 966»/»- 2 - Palm 966 »/ »

'In überraschender Weise wurde gefunden, daß ein plattenförmiger Einsats aus thermisch beständigem Material durch Eingießen im Kolbenboden sicher festgehalten werden kann, und daß Hißbildungen vermieden werden können, wenn der plattenförmige Einsats erfindungsgemäQ mit mehreren radial abstehenden Armen versehen ist und mit diesen in den Kolben eingegossen ist. Durch die Anordnung der Arme wird eine mechanische Veranke-'Surprisingly, it was found that a plate-shaped Inserts made of thermally resistant material by being poured into the Piston head can be held securely, and that formation of hips can be avoided if the plate-shaped insert according to the invention has a plurality of radially protruding arms is provided and is poured into the piston with these. The arrangement of the arms creates a mechanical anchoring

„ rung erzielt, die hohen Belastungen standhält. Außerdem braucht das Material des Einsatzes nicht im Hinblick auf eine innige Bindung mit dem Kolbenmaterial hin ausgewählt zu werden.“Achievement that can withstand high loads. Also needs the material of the insert not to be selected for an intimate bond with the piston material.

In vorteilhafter Ausgestaltung des Gegenstandes der Erfindung kann der plattenförmige Einsatz mit seinen Armen aus einem Material bestehen, das einen annähernd gleichen Ausdehnungskoeffizienten aufweist wie das Material des Kolbens·In an advantageous embodiment of the subject matter of the invention the plate-shaped insert with its arms can be made of a material that has approximately the same coefficient of expansion as the material of the piston

Sofern der Kolben einen eingegossenen Ringträger aufweist, kann der plattenförmige Einsatz mit den Armen und dem Ringträger besonders vorteilhaft aus einem Stück bestehen.If the piston has a cast-in ring carrier, can the plate-shaped insert with the arms and the ring carrier particularly advantageously consist of one piece.

In der Zeichnung ist der Gegenstand der Erfindung in eines AusfUhrungsbeiapiel dargestellt. Es zeigen!In the drawing, the subject of the invention is in one Implementation example shown. Show it!

Fig. 1 einen Längsschnitt durch einen Leichtmetallkolben undFig. 1 shows a longitudinal section through a light metal piston and

Fig. 2 eine Draufsicht auf den Kolben nach Fig. 1.FIG. 2 is a plan view of the piston according to FIG. 1.

Der Kolben I nach den Fig. 1 und 2 für eine luftverdichtende Einspritzbrennkraftmaschine besteht aus Leichtmetall. In seinem Kolbenboden 2 befindet sich eine Brennraummulde 3t deren Fläche sum Teil von einem plattenförmigen Einsatz k in Scheibenform gebildet ist. Dieser Einsatz k besteht aus einem thermisch hochThe piston I according to FIGS. 1 and 2 for an air-compressing injection internal combustion engine consists of light metal. In its piston crown 2 there is a combustion bowl 3t, the surface of which is partially formed by a plate-shaped insert k in the shape of a disk. This insert k consists of a thermally high

409S14/07S2409S14 / 07S2

belastbarem Material mit ähnlichen Ausdehnungskoeffizienten wie der des Kolbenmaterials und ist in das Kolbenmaterial ein-. gegossen. Um eine sichere Verankerung des Einsatzes mit dem Kolbenmaterial zu erzielen, ist der Einsatz mit radial nach außen.gerichteten Armen 5 versehen, die an einen ebenfalls eingegossenen Ringträger 6 anschließen.resilient material with similar expansion coefficients like that of the piston material and is one in the piston material. poured. To ensure that the insert is securely anchored to the To achieve piston material, the insert is provided with radially outwardly directed arms 5, which are also attached to a Connect the cast ring carrier 6.

Der Einsatz ht die Arme-5 und der Ringträger 6 bilden ein Stück und sind aus gleichem thermisch hoch belastbarem Material.The insert h t the arms 5 and the ring carrier 6 form one piece and are made of the same material that can withstand high thermal loads.

409814/0 752409814/0 752

Claims (3)

Palm Palm 966k/h966k / h AnsprücheExpectations Leichtmetallkolben für luftverdichtende Einspritzbrennkraftmaschinen, insbesondere für Vorkammermaschinen mit direkt gegen den Kolben gerichteter Öffnung der Vorkammer, der mit einem plattenförmigen Einsatz im Kolbenboden versehen ist, dadurch gekennzeichnet, daß der plattenförmige Einsatz (k) mit mehreren radial abstehenden Armen (5) vorsehen ist und mit diesen Armen in den Kolben (1) eingegossen ist.Light metal piston for air-compressing injection internal combustion engines, in particular for pre-chamber machines with an opening of the pre-chamber which is directed directly towards the piston and which is provided with a plate-shaped insert in the piston head, characterized in that the plate-shaped insert (k) is provided with several radially protruding arms (5) and with these arms is cast into the piston (1). 2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß der plattenförinige Einsatz (h) mit seinen Armen (5). aus einem Material bestellt, das einen annähernd gleichen Ausdehnungskoeffizienten aufweist wie das Material des Kolbens (i).2. Piston according to claim 1, characterized in that the plate-shaped insert (h) with its arms (5). ordered from a material that has approximately the same coefficient of expansion as the material of the piston (i). 3. Kolben nach den Ansprüchen 1 und 2, der mit einem eingegossenen Ringträger versehen ist, dadurch gekennzeichnet, daß der plattenförmige Einsatz (k) mit den Armen (5) und dem Ringträger (6) aus einem Stück besteht.3. Piston according to claims 1 and 2, which is provided with a cast ring carrier, characterized in that the plate-shaped insert (k) with the arms (5) and the ring carrier (6) consists of one piece. A0a8U/Ü752A0a8U / Ü752
DE19722248008 1972-09-29 1972-09-29 LIGHT ALLOY PISTON FOR AIR COMPRESSING INJECTION COMBUSTION MACHINES Pending DE2248008A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19722248008 DE2248008A1 (en) 1972-09-29 1972-09-29 LIGHT ALLOY PISTON FOR AIR COMPRESSING INJECTION COMBUSTION MACHINES
FR7334671A FR2203938A1 (en) 1972-09-29 1973-09-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722248008 DE2248008A1 (en) 1972-09-29 1972-09-29 LIGHT ALLOY PISTON FOR AIR COMPRESSING INJECTION COMBUSTION MACHINES

Publications (1)

Publication Number Publication Date
DE2248008A1 true DE2248008A1 (en) 1974-04-04

Family

ID=5857848

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722248008 Pending DE2248008A1 (en) 1972-09-29 1972-09-29 LIGHT ALLOY PISTON FOR AIR COMPRESSING INJECTION COMBUSTION MACHINES

Country Status (2)

Country Link
DE (1) DE2248008A1 (en)
FR (1) FR2203938A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137887A (en) * 1976-06-11 1979-02-06 Perkins Engines Limited Pistons for internal combustion engines
US4140096A (en) * 1976-03-31 1979-02-20 Perkins Engines Limited Pistons for internal combustion engines
DE102008031863A1 (en) * 2008-07-05 2010-01-07 Mahle International Gmbh Insert for a piston of an internal combustion engine and provided with the insert piston or piston head
DE102008031862A1 (en) * 2008-07-05 2010-01-07 Mahle International Gmbh Insert for piston of combustion engine, particularly diesel engines, has circulating fire land, circulating ring portion and circulating cooling duct, where piston head is provided with piston base having combustion recess

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140096A (en) * 1976-03-31 1979-02-20 Perkins Engines Limited Pistons for internal combustion engines
US4137887A (en) * 1976-06-11 1979-02-06 Perkins Engines Limited Pistons for internal combustion engines
DE102008031863A1 (en) * 2008-07-05 2010-01-07 Mahle International Gmbh Insert for a piston of an internal combustion engine and provided with the insert piston or piston head
DE102008031862A1 (en) * 2008-07-05 2010-01-07 Mahle International Gmbh Insert for piston of combustion engine, particularly diesel engines, has circulating fire land, circulating ring portion and circulating cooling duct, where piston head is provided with piston base having combustion recess

Also Published As

Publication number Publication date
FR2203938A1 (en) 1974-05-17

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