EP0856100B1 - Cast light metal piston for a two-stroke engine - Google Patents
Cast light metal piston for a two-stroke engine Download PDFInfo
- Publication number
- EP0856100B1 EP0856100B1 EP96945490A EP96945490A EP0856100B1 EP 0856100 B1 EP0856100 B1 EP 0856100B1 EP 96945490 A EP96945490 A EP 96945490A EP 96945490 A EP96945490 A EP 96945490A EP 0856100 B1 EP0856100 B1 EP 0856100B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- stroke engine
- light metal
- cast light
- wall part
- 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 - Lifetime
Links
Images
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
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
-
- 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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Definitions
- the invention relates to a cast light metal piston for a 2-stroke engine according to the preamble of the claim.
- Such a light metal piston known from practice is box-type, with the piston skirt in each of the connecting each with the piston pin hub Wall part is provided a window-like recess, so that when flowing through the gas mixture from the inside out piston cooling is achieved through the four windows becomes.
- the disadvantage of such an embodiment is the large one Manufacturing effort when casting the piston, in particular Cold welds in the area of the window-like recesses to avoid.
- the problem of the present invention is to be constructive easy way to find a piston that is casting easy to manufacture the put on a 2-stroke engine Cooling, light weight and mixture flow requirements well fulfilled.
- the invention is based in particular on the knowledge that that with manufacturing and inexpensive one-sided sprue each have a window-like recess in the piston skirt wall part connecting to the piston pin hub
- the sprue side can be easily produced by casting is sufficient on the other hand with regard to cooling the piston is.
- the other part of the wall is closed on the one hand a better heat flow from the piston crown to the Piston shaft reached and on the other hand by the different Mass of the two wall parts on a piston pin hub it is not necessary to unlock the piston pin, which in turn reduces the manufacturing effort becomes.
- the invention is based on a preferred, in the drawing illustrated embodiment explained in more detail.
- a cast light alloy piston 1 in a box design for one 2-stroke engine e.g. as a drive motor for a chainsaw, consists in one piece of a piston head 2 and a Piston shaft 3, piston pin hubs 4 on piston crown 5 molded in one piece and with the piston skirt 3 over straight Wall parts 6, 7 are connected.
- each wall part 6 on the sprue side of the piston 1 is in each case a window-like recess 8 is provided here is easy to manufacture by casting and in particular for cooling, weight reduction and flow through the mixture serves.
- the respective wall part located away from the sprue side 7 is closed up to the piston crown 5 and at its lower, lying at the open shaft end 9 pulled up 10 so that there is a Recess 11 results in the corresponding openings in Cylinder (not shown) interacts to create a targeted To achieve mixture overflow. Because of the different Formation of the two wall parts 6, 7 on a piston pin hub 4 different masses result through the center of the piston pin hub in the piston longitudinal axis extending level, so that regarding noise minimization to an otherwise necessary decaching of the piston pin axis can be dispensed with.
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 gegossenen Leichtmetallkolben für einen 2-Takt-Motor nach dem Oberbegriff des Patentanspruchs.The invention relates to a cast light metal piston for a 2-stroke engine according to the preamble of the claim.
Ein derartiger aus der Praxis bekannter Leichtmetallkolben ist in Kastenbauart ausgeführt, wobei in jedem der den Kolbenschaft jeweils mit der Kolbenbolzennabe verbindenden Wandteil eine fensterartige Aussparung vorgesehen ist, so daß beim Durchströmen des Gasgemisches von innen nach außen durch die vier Fenster eine entsprechende Kolbenkühlung erreicht wird.Such a light metal piston known from practice is box-type, with the piston skirt in each of the connecting each with the piston pin hub Wall part is provided a window-like recess, so that when flowing through the gas mixture from the inside out piston cooling is achieved through the four windows becomes.
Nachteilig an einer derartigen Ausführung ist der große Herstellungsaufwand beim Gießen des Kolbens, um insbesondere Kaltschweißstellen im Bereich der fensterartigen Aussparungen zu vermeiden.The disadvantage of such an embodiment is the large one Manufacturing effort when casting the piston, in particular Cold welds in the area of the window-like recesses to avoid.
Problem der vorliegenden Erfindung ist es, auf konstruktiv einfache Weise einen Kolben zu finden, der gußtechnisch einfach herstellbar die an einen 2-Takt-Motor gestellten Anforderungen bezüglich Kühlung, geringes Gewicht und Gemischüberströmung gut erfüllt.The problem of the present invention is to be constructive easy way to find a piston that is casting easy to manufacture the put on a 2-stroke engine Cooling, light weight and mixture flow requirements well fulfilled.
Gelöst wird dieses Problem mit einem gegossenen Leichtmetallkolben mit den Merkmalen nach dem Kennzeichen des Patentanspruchs. This problem is solved with a cast light alloy piston with the features according to the characterizing part of the patent claim.
Der Erfindung liegt insbesondere die Erkenntnis zugrunde, daß bei herstellungs- und kostengünstigem einseitigen Anguß jeweils eine fensterartige Aussparung in dem den Kolbenschaft mit der Kolbenbolzennabe verbindenden Wandteil auf Angußseite einerseits gießtechnisch problemlos herstellbar ist und andererseits bezüglich Kühlung des Kolbens ausreichend ist. Außerdem ist durch das andere geschlossene Wandteil einerseits ein besserer Wärmefluß vom Kolbenboden zum Kolbenschaft erreicht und andererseits durch die unterschiedliche Masse der beiden Wandteile an einer Kolbenbolzennabe eine Desachsierung des Kolbenbolzens nicht notwendig, wodurch der Herstellungsaufwand wiederum verringert wird. Zusätzlich ist durch das unten hochgezogene geschlossene Wandteil ein größerer Gasdurchsatz erreichbar.The invention is based in particular on the knowledge that that with manufacturing and inexpensive one-sided sprue each have a window-like recess in the piston skirt wall part connecting to the piston pin hub On the one hand, the sprue side can be easily produced by casting is sufficient on the other hand with regard to cooling the piston is. In addition, the other part of the wall is closed on the one hand a better heat flow from the piston crown to the Piston shaft reached and on the other hand by the different Mass of the two wall parts on a piston pin hub it is not necessary to unlock the piston pin, which in turn reduces the manufacturing effort becomes. In addition is closed by the pulled up below Part of the wall achieves a larger gas throughput.
Die Erfindung ist anhand eines bevorzugten, in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention is based on a preferred, in the drawing illustrated embodiment explained in more detail.
Es zeigen
- Fig. 1
- einen erfindungsgemäßen Kolben im Schnitt,
- Fig. 2
- eine Seitenansicht teilweise im Schnitt,
- Fig. 3
- einen Schnitt III-III gem. Fig. 2 und
- Fig. 4
- einen Schnitt IV - IV gem. Fig. 2.
- Fig. 1
- a piston according to the invention in section,
- Fig. 2
- a side view partly in section,
- Fig. 3
- a section III-III acc. Fig. 2 and
- Fig. 4
- a section IV - IV acc. Fig. 2.
Ein gegossener Leichtmetallkolben 1 in Kastenbauart für einen
2-Takt-Motor, z.B. als Antriebsmotor für eine Kettensäge,
besteht einstückig aus einem Kolbenkopf 2 und einem
Kolbenschaft 3, wobei Kolbenbolzennaben 4 am Kolbenboden 5
einstückig angeformt und mit dem Kolbenschaft 3 über gerade
Wandteile 6, 7 verbunden sind.A cast
In jedem Wandteil 6 auf Angußseite des Kolbens 1 ist jeweils
eine fensterartige Aussparung 8 vorgesehen, die hier
gießtechnisch problemlos herstellbar ist und insbesondere
zur Kühlung, Gewichtsreduzierung und Durchströmung des Gemisches
dient.In each
Das jeweilige von der Angußseite entfernt liegende Wandteil
7 ist geschlossen bis zum Kolbenboden 5 ausgeführt und
an seinem unteren, am offenen Schaftende 9 liegenden Bereich
nach oben hochgezogen 10, so daß sich hier eine
Aussparung 11 ergibt, die mit entsprechenden Öffnungen im
Zylinder (nicht gezeichnet) zusammenwirkt, um eine gezielte
Gemischüberströmung zu erreichen. Durch die unterschiedliche
Ausbildung der beiden Wandteile 6, 7 an einer Kolbenbolzennabe
4 ergeben sich unterschiedliche Massen bezüglich
der durch die Mitte der Kolbenbolzennabe in Kolbenlängsachse
sich erstreckende Ebene, so daß bezüglich Geräuschminimierung
auf eine sonst notwendige Desachsierung der Kolbenbolzenachse
verzichtet werden kann.The respective wall part located away from the
Mit einer derartigen Ausführung wird auf konstruktiv einfache Weise ein gegossener Leichtmetallkolben für einen 2-Takt-Motor geschaffen, der durch die Kombination seiner Merkmale einen optimalen Kompromiß bezüglich Gießfähigkeit, Kühlung, Gewichtsreduzierung, Geräuschminderung und Gemischüberströmung darstellt.With such a design is structurally simple A cast light alloy piston for one 2-stroke engine created by combining its Features an optimal compromise regarding castability, Cooling, weight reduction, noise reduction and mixture overflow represents.
Claims (1)
- A cast light metal piston of box-type construction for a 2-stroke engine in which the gudgeon pin bosses are integrally formed on the piston crown and are connected to the piston body via substantially straight wall parts, characterised by the following features:the piston blank has only one deadhead in its region of a piston body side (3),the wall part (6) connecting the piston body (3) to the gudgeon pin boss (4) is provided on the deadhead side with a window-like cut-out (8),the wall part (7) remote from the deadhead side and connecting the piston body (3) to the gudgeon pin boss (4) is of closed construction,in relation to the body length, the closed wall part (7) is extended upwardly from the open body end (9).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19538407A DE19538407A1 (en) | 1995-10-16 | 1995-10-16 | Cast alloy pistons for a 2-stroke engine |
| DE19538407 | 1995-10-16 | ||
| PCT/DE1996/001937 WO1997014880A2 (en) | 1995-10-16 | 1996-10-10 | Cast light metal piston for a two-stroke engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0856100A2 EP0856100A2 (en) | 1998-08-05 |
| EP0856100B1 true EP0856100B1 (en) | 1999-05-06 |
Family
ID=7774935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96945490A Expired - Lifetime EP0856100B1 (en) | 1995-10-16 | 1996-10-10 | Cast light metal piston for a two-stroke engine |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5979391A (en) |
| EP (1) | EP0856100B1 (en) |
| BR (1) | BR9610972A (en) |
| DE (2) | DE19538407A1 (en) |
| ES (1) | ES2134029T3 (en) |
| WO (1) | WO1997014880A2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7406941B2 (en) | 2004-07-21 | 2008-08-05 | Federal - Mogul World Wide, Inc. | One piece cast steel monobloc piston |
| AT505592B1 (en) * | 2007-07-06 | 2009-04-15 | Mahle Kinig Kommanditgesellsch | PISTON |
| US8807109B2 (en) * | 2009-11-06 | 2014-08-19 | Federal-Mogul Corporation | Steel piston with cooling gallery and method of construction thereof |
| DE102010008260B4 (en) * | 2010-02-17 | 2021-08-19 | Andreas Stihl Ag & Co. Kg | Two-stroke engine |
| EP3284938B1 (en) * | 2016-08-19 | 2020-10-07 | Andreas Stihl AG & Co. KG | Piston for a two-stroke engine working with direct injection and two-stroke engine |
| EP3699418B1 (en) | 2016-08-19 | 2022-12-07 | Andreas Stihl AG & Co. KG | Two-stroke engine and piston for a two-stroke engine working with flushing system |
| SE543272C2 (en) | 2019-03-06 | 2020-11-10 | Husqvarna Ab | Engine piston, engine, hand-held tool, and method of manufacturing an engine piston |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1081882A (en) * | 1953-05-09 | 1954-12-23 | Particular device of the gas transfer channels on an internal combustion engine | |
| US3257997A (en) * | 1965-02-04 | 1966-06-28 | Mcculloch Corp | Piston for internal combustion engine |
| DE1301658B (en) * | 1966-02-02 | 1969-08-21 | Mahle Kg | Two-stroke internal combustion engine |
| JPS5840649B2 (en) * | 1972-08-22 | 1983-09-07 | パ−フオ−マンス インダストリイズ インコ−ポレ−テツド | benzouchi |
| US4195600A (en) * | 1976-04-15 | 1980-04-01 | Yamaha Hatsudoki Kabushiki Kaisha | Crankcase chamber compression type two cycle internal combustion engines |
| JPS5788253A (en) * | 1980-11-20 | 1982-06-02 | Yamaha Motor Co Ltd | Shape of piston of two-cycle engine |
| DE3430258A1 (en) * | 1984-08-17 | 1986-02-27 | Mahle Gmbh, 7000 Stuttgart | SUBMERSIBLE PISTON FOR COMBUSTION ENGINES |
| GB8724026D0 (en) * | 1987-10-13 | 1987-11-18 | T & N Technology Ltd | Pistons |
| JP2561798Y2 (en) * | 1989-05-22 | 1998-02-04 | 株式会社ユニシアジェックス | Engine piston |
| DE4342044B4 (en) * | 1993-12-09 | 2006-08-31 | Mahle Gmbh | Piston for an internal combustion engine |
| JPH07293325A (en) * | 1994-04-20 | 1995-11-07 | Aisin Seiki Co Ltd | Piston for internal combustion engine |
| DE4434994C2 (en) * | 1994-09-30 | 1998-02-19 | Porsche Ag | Pistons for internal combustion engines |
| DE4446726A1 (en) * | 1994-12-24 | 1996-06-27 | Mahle Gmbh | Process for producing a one-piece cooling channel piston |
| JPH08211471A (en) * | 1995-02-07 | 1996-08-20 | Olympus Optical Co Ltd | Collapsible barrel type camera |
-
1995
- 1995-10-16 DE DE19538407A patent/DE19538407A1/en not_active Withdrawn
-
1996
- 1996-10-10 ES ES96945490T patent/ES2134029T3/en not_active Expired - Lifetime
- 1996-10-10 BR BR9610972A patent/BR9610972A/en not_active IP Right Cessation
- 1996-10-10 DE DE59601840T patent/DE59601840D1/en not_active Expired - Lifetime
- 1996-10-10 WO PCT/DE1996/001937 patent/WO1997014880A2/en active IP Right Grant
- 1996-10-10 US US09/051,049 patent/US5979391A/en not_active Expired - Lifetime
- 1996-10-10 EP EP96945490A patent/EP0856100B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997014880A2 (en) | 1997-04-24 |
| DE19538407A1 (en) | 1997-04-17 |
| BR9610972A (en) | 1999-03-02 |
| US5979391A (en) | 1999-11-09 |
| DE59601840D1 (en) | 1999-06-10 |
| EP0856100A2 (en) | 1998-08-05 |
| WO1997014880A3 (en) | 1997-06-05 |
| ES2134029T3 (en) | 1999-09-16 |
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