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DE3331664A1 - Cylinder for a reciprocating piston internal combustion engine, especially a two-stroke internal combustion engine - Google Patents

Cylinder for a reciprocating piston internal combustion engine, especially a two-stroke internal combustion engine

Info

Publication number
DE3331664A1
DE3331664A1 DE19833331664 DE3331664A DE3331664A1 DE 3331664 A1 DE3331664 A1 DE 3331664A1 DE 19833331664 DE19833331664 DE 19833331664 DE 3331664 A DE3331664 A DE 3331664A DE 3331664 A1 DE3331664 A1 DE 3331664A1
Authority
DE
Germany
Prior art keywords
core
cylinder
loose
internal combustion
cast
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.)
Granted
Application number
DE19833331664
Other languages
German (de)
Other versions
DE3331664C2 (en
Inventor
Robert 8717 Mainbernheim Wurm
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.)
ZF Friedrichshafen AG
Original Assignee
Fichtel and Sachs 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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Priority to DE19833331664 priority Critical patent/DE3331664A1/en
Publication of DE3331664A1 publication Critical patent/DE3331664A1/en
Application granted granted Critical
Publication of DE3331664C2 publication Critical patent/DE3331664C2/de
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads 
    • F02F1/18Other cylinders
    • F02F1/22Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/02Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00Manufacturing
    • F02F2200/06Casting

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a cylinder with cast-on cylinder head and cast-in cylinder liner for two-stroke internal combustion engines. The cylinder is manufactured from light alloy by the die-casting method and has closed transfer ports. A split core, the bottom part of which is connected to the core for the cylinder chamber, serves for forming these, whilst for the curved, upper port area a loose steel core is provided, which on the one hand is supported on the bottom core part by means of gudgeons and on the other hand is radially secured in the upper area during the casting process by means of a bearing pin which can be cast in. After the die-casting process the upper, loose core is pressed out of the still warm casting into the cylinder chamber. <IMAGE>

Description

ZYLINDER F0R NUBKOLBEN-BRENNKRAFTMASCHyNE, INSBESONDERE. CYLINDER FOR NUB PISTON ENGINE, IN PARTICULAR.

ZWEITAKT-BRENNKRAFTMASCHINE BESCHREIBUNC Die Erfindung bezieht sich auf einen Zylinder fAr eine Hub kolben-Brennkraftmaschine, insbesondere Zweitakt-Brennkraftmaschine, gemäß dem Oberbegriff des Patentanspruches 15 Es ist bereits hekannt, den Zylinder fur eine Zweitakt-Brennkraftmaschine zu gießen, bei welchem die im wesentlichen parallel zur Zylinderlängsachse verlaufenden Überströmkanäle zur Zylinderlaufbahn hin offen gegossen sind, Bei diesem Zylinder werden die Überströmkanäle zur Zylinderlaufbahn durch strömungsgünstig geformte Einschubbleche verschlossen. Ungünstig ist u. a. bei dieser Ausgestaltung eines Brennkraftmaschinen-Zylinders, daß die Einschubbleche zur Abgrenzung der überströmkanäle in einem gesonderten Vorgang montiert werden müssen (DE-OS 2 143 693) Der Erfindung liegt u. a. die Aufgabe zugrunde, den gattungsgemäßen Brennkraftmaschinen-Zylinder für einen Zweitaktmotor mit beim Gleßen geschlossenen Überströmkanälen im Druckgußverfahren herstellen zu können.TWO-STROKE COMBUSTION ENGINE DESCRIPTION The invention relates to on a cylinder for a reciprocating internal combustion engine, in particular a two-stroke internal combustion engine, according to the preamble of claim 15 It is already known, the cylinder for a two-stroke internal combustion engine, in which the essentially Overflow channels running parallel to the longitudinal axis of the cylinder to the cylinder liner are cast open, with this cylinder, the overflow ducts become the cylinder liner closed by aerodynamically shaped slide-in plates. Unfavorable is inter alia. in this embodiment of an internal combustion engine cylinder that the slide-in plates to delimit the overflow channels in a separate process must (DE-OS 2 143 693) The invention is inter alia. the task is based on the generic Internal combustion engine cylinders for a two-stroke engine with closed during glazing To be able to produce overflow channels in the die-casting process.

Die erfindungsgemäße Lösung dieser Aufgabe ist im kennzeichnenden Teil des Patentanspruches 1 angegeben. - Mit dieser Ausgestaltung läßt sich ein Motorzylinder als Druckgußteil mit einer gegossenen Trennwand zwischen der Zylinderbohrung und jeweils den Oberströmkanälen mit verhältnismäßig geringem Aufwand herstellen. Ein verhältnismäßig aufwendiger Montagevorgang, wie eingangs geschildert, ist nIcht mehr erforderlichn Weitere vorteilhafte Einzelheiten der Erfindung sind genstand der Unteransprüche.The inventive solution to this problem is in the characterizing Part of claim 1 specified. - With this configuration one can Engine cylinder as a die-cast part with a cast partition between the cylinder bore and each produce the upper flow channels with relatively little effort. A relatively complex assembly process, as described above, is not more required Further advantageous details of the invention are the subject of the subclaims.

Die Erfindung wird nachstehend an Hand elnes in der Zeichnung veranschaulichten Ausführungsbeispieles näher erläutert.The invention is illustrated below with reference to the drawing Embodiment explained in more detail.

Die Figur zeigt eine schematisierte Darstellung eines Motorzylinders in erfindungsgemäß ausgestalteter DruckgußausfUhrungY In der Figur ist mit 1 ein Zylinder mit angegossenem Zylinderkopf einer Zweitakt-Hubkolhen-Brennkraftmaschine bezeichnet, welcher luft- oder auch flüssigkeitsgekühlt sein kann Der Zylinder 1 wird im Druckgußverfahren aus einer speziellen Aluminiumlegierung hergestellt, Der Zylinder l ist ohne eingegossene Laufbüchse ausgeführt; die eingegossene Kolbenlauffläche ist mit 2 bezeichnet.The figure shows a schematic representation of an engine cylinder in die-cast design designed according to the invention. In the figure, 1 is a Cylinder with cast cylinder head of a two-stroke reciprocating internal combustion engine denotes, which can be air-cooled or also liquid-cooled. The cylinder 1 is made from a special aluminum alloy using the die-casting process, Der Cylinder 1 is designed without a cast-in liner; the cast-in piston running surface is denoted by 2.

Die für die Verwendung als Zweitakt-Brennkraftmaschine notwendigen Überströmkanäle sind eingegossen und dabei mit einer Trennwand gegenüber dem Zylinderraum la geschlossen ausgebildet. Während der axial untere Bereich jedes Überströmkanales 3 gestreckt und annähernd parallel zur Zylinderlängsachse ausgebildet ist5 weist jeder Überströmkanal im oberen Bereich jeweils eine Krümmung 4 mit Einmündung in den Zylinderraum la auf.The necessary for use as a two-stroke internal combustion engine Overflow channels are cast in and with a partition opposite the cylinder space la closed trained. During the axially lower area of each transfer channel 3 is stretched and formed approximately parallel to the cylinder longitudinal axis5 has each overflow channel in the upper area has a curvature 4 with a confluence in the cylinder space la.

Zur Ausformung des gestreckten Teiles jedes Überströmkanales 3 ist ein Stahlkern 5 vorgesehen, welcher zusammen mit dem Stahlkern 5a für die eingegossene Kolbenlauffläche im selben Schieber untergebracht ist. Für den gekrümmten Bereich 4 des Überströmkanales 3 ist jeweils ein Kern 6 als Losteil vorgesehen5 welcher sich axial auf dem oberen Bereich des Stahlkernes 5 abstützt.To shape the elongated part of each overflow channel 3 is a steel core 5 is provided, which together with the steel core 5a for the cast Piston running surface is housed in the same slide. For the curved area 4 of the overflow channel 3, a core 6 is provided in each case as a loose part5 which is supported axially on the upper area of the steel core 5.

Zur Führung dient dabei ein Zapfen 6a zwis&hen dem losen Kern 6 und dem festen Kernteil 5* Der Zapfen 6a dient dabei zur Abstützung des losen Kernes 6 in seinem unteren Bereich. Pür die Abstützung des losen Kernes 6 in seinem oberen Bereich in radialer Richtung ist ein etwa stiftförmiger Anschlag 7 vorgesehen, welcher beim fertigen Druckgußstück in der Wandung eingegossen verbleibt, wie insbesondere die Figur erkennen läßt. Mit dieser Abstützung mittels des stiftförmigen Anschlages 7 wird der lose Kern 6 gegen Verlagerung während des Einspritzens des Metalles gesichert.A pin 6a between the loose core is used for guidance 6 and the fixed core part 5 * The pin 6a serves to support the loose Core 6 in its lower area. Pür the support of the loose core 6 in his an approximately pin-shaped stop 7 is provided in the upper area in the radial direction, which remains cast in the wall of the finished die-cast piece, such as in particular reveals the figure. With this support by means of the pin-shaped stop 7, the loose core 6 is secured against displacement during the injection of the metal.

Diese stiftförmige Abstützung 7 ist in der bevorzugten Ausführung in der Form eines Niet stiftes mit zum Zylinderinnenraum gerichtetem Kopf etwa in gleicher Materialbeschaffenheit wie der Druckguß-Zylinder ausgebildet, beispielsweise als Aluminium-Niet Es ist aber auch möglich, einen stiftförmigen Anschlag aus Stahl zu verwenden. Die stiftförmige Abstützung 7 für den oberen Bereich des losen Kernes 6 kann nach dem Aus formen an seinem radial herausstehenden Ende abgeschnitten werden; es ist aber ebenso möglich, das zwischen den Kühlrippen befindliche Ende des Anlagestiftes 7 zu belassen.This pin-shaped support 7 is in the preferred embodiment in the form of a rivet pin with the head facing the cylinder interior approximately in the same material properties as the die-cast cylinder, for example As an aluminum rivet, it is also possible to use a pin-shaped stop made of steel to use. The pin-shaped support 7 for the upper area of the loose core 6 can be cut off after the shape at its radially protruding end; but it is also possible that the end of the contact pin located between the cooling fins 7 to leave.

Der vorbeschriebene lose Stahlkern 6 ist so ausgestaltet, daß er nach dem Druckgußvorgang mittels einer entsprechenden Vorrichtung aus dem noch warmen GuRstück in den Zylinderinnenraum hineingedrückt werden kann.The above-described loose steel core 6 is designed so that it after the die-casting process by means of an appropriate device from the still warm GuRstück can be pressed into the cylinder interior.

- Leerseite -- blank page -

Claims (5)

ZYLINDER FR HUBKOLBEN-BRENNKRAFTMASCHNE, INSBESONDERE ZXEITAKT-BRENNKRAFTMASCHINE PATENTANSPRÜCHE Zylinder für Hubkolben-Brennkraftmaschine, insbesondere Zweitakt-Brennkraftmaschineg mit angegossenem Zylinderkopf und eingegossener Kolbenlaufflächeg gekennzeichnet durch folgende Merkmale; a) Der Motorzylinder ist aus Leichtmetall im Druckgußverfahren hergestellt; b) die Uberströmkanäle sind gegenüber dem Zylinderraum geschlossen ausgebildet eingegossen; c) der fUr jeden Überströmkanal erforderliche Kern ist geteilt ausgebildet; d) der Kern jeweils für den unteren Bereich der Uberströmkanäle ist zusammen mit dem Stahlkern für die Kolbenlauffläche in einem Schieber untergebracht; e) der Kern für den oberen3 gekrUmmten Bereich der Überströmkanäle ist jeweils als gesonderter, loser Stahlkern ausgebildet, der in axialer Richtung am Kern für den unteren Bereich des Überströmkanales festgelegt ist; f) für die Festlegung des losen Kernes am Kern fUr den unteren Teil des Überströmkanales ist eine Zapfenverbindung vorgesehen; g) der lose Kern ist radial an einer Kernstütze abgestützt; h) der lose Stahlkern ist in den Zylinderraum hineindrückbar ausgestaltet. CYLINDERS FOR PISTON ENGINE, IN PARTICULAR TWO-STROKE COMBUSTION MACHINE PATENT CLAIMS Cylinders for reciprocating internal combustion engines, especially two-stroke internal combustion engines marked with cast cylinder head and cast piston running surface through the following features; a) The engine cylinder is made of light metal in a die-casting process manufactured; b) the overflow channels are closed with respect to the cylinder space molded molded; c) is the core required for each transfer channel divided trained; d) the core in each case for the lower area of the overflow channels is housed in a slide together with the steel core for the piston running surface; e) the core for the upper3 curved area of the transfer channels is in each case as Separate, loose steel core formed in the axial direction on the core for the the lower area of the overflow channel is set; f) for determining the loose The core on the core for the lower part of the overflow channel is a tenon connection intended; g) the loose core is supported radially on a core support; h) the loose steel core is designed so that it can be pushed into the cylinder space. 2. Zylinder nach Anspruch 1, dadurch gekennzeichnet, daß die Kernstütze C7) für den losen Kern (6) jeweils etwa stiftförmig ausgebildet istq 2. Cylinder according to claim 1, characterized in that the core support C7) is approximately pin-shaped for the loose core (6) 3. Zylinder nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kernstütze (7) für den losen Kern -(6) aus einem Leichtmetall-Niet mit dem Kern zugewandtem Kopf besteht, 3rd cylinder according to claim 1 or 2, characterized in that the core support (7) for the loose Core - (6) consists of a light metal rivet with the head facing the core, 4. Zylinder nach Anspruch 3, dadurch gekennzeichnet, daß die Kernstütze aus einem Aluminium-Niet besteht 4th Cylinder according to Claim 3, characterized in that the core support consists of an aluminum rivet consists 5. Zylinder nach Anspruch 2, dadurch gekennzeichnet, daß die KernstUtze (7) für den losen Kern (6) von einem Stahlstift gebildet ists5. Cylinder according to claim 2, characterized in that the core support (7) for the loose core (6) is formed by a steel pin
DE19833331664 1983-09-02 1983-09-02 Cylinder for a reciprocating piston internal combustion engine, especially a two-stroke internal combustion engine Granted DE3331664A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19833331664 DE3331664A1 (en) 1983-09-02 1983-09-02 Cylinder for a reciprocating piston internal combustion engine, especially a two-stroke internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833331664 DE3331664A1 (en) 1983-09-02 1983-09-02 Cylinder for a reciprocating piston internal combustion engine, especially a two-stroke internal combustion engine

Publications (2)

Publication Number Publication Date
DE3331664A1 true DE3331664A1 (en) 1985-03-21
DE3331664C2 DE3331664C2 (en) 1992-04-16

Family

ID=6208060

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19833331664 Granted DE3331664A1 (en) 1983-09-02 1983-09-02 Cylinder for a reciprocating piston internal combustion engine, especially a two-stroke internal combustion engine

Country Status (1)

Country Link
DE (1) DE3331664A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010026597A1 (en) 2010-07-08 2012-01-12 Mahle International Gmbh Method for producing a cylinder for a two-stroke engine and casting core therefor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2143693A1 (en) * 1971-09-01 1973-03-08 Zuendapp Werke Gmbh COMBUSTION MACHINE CYLINDERS

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2143693A1 (en) * 1971-09-01 1973-03-08 Zuendapp Werke Gmbh COMBUSTION MACHINE CYLINDERS

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010026597A1 (en) 2010-07-08 2012-01-12 Mahle International Gmbh Method for producing a cylinder for a two-stroke engine and casting core therefor
WO2012010144A2 (en) 2010-07-08 2012-01-26 Mahle International Gmbh Method for producing a cylinder for a two-stroke engine and casting core therefor
CN102985675A (en) * 2010-07-08 2013-03-20 马勒国际公司 Method for producing a cylinder for a two-stroke engine and casting core therefor
CN102985675B (en) * 2010-07-08 2016-04-27 马勒国际公司 Method for manufacturing a cylinder for a two-stroke engine and a core for the method

Also Published As

Publication number Publication date
DE3331664C2 (en) 1992-04-16

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Legal Events

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8110 Request for examination paragraph 44
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee