EP0856100B1 - Piston en metal leger coule pour moteur deux temps - Google Patents

Piston en metal leger coule pour moteur deux temps Download PDF

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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
Application number
EP96945490A
Other languages
German (de)
English (en)
Other versions
EP0856100A2 (fr
Inventor
Reiner Ulrich
Joachim Schmidt
Udo Buschkamp
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
Publication of EP0856100A2 publication Critical patent/EP0856100A2/fr
Application granted granted Critical
Publication of EP0856100B1 publication Critical patent/EP0856100B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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  • 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)

Claims (1)

  1. Piston en métal léger coulé réalisé en construction modulaire pour un moteur à deux temps, sur lequel les moyeux d'axe de piston sont conformés d'une seule pièce sur le fond de piston et sont assemblés avec la tige de piston par l'intermédiaire de parties de paroi à peu près rectilignes, caractérisé par les caractéristiques suivantes :
    l'ébauche de piston ne présente qu'une entrée dans la zone d'un côté de la tige de piston (3),
    la partie de paroi (6), assemblant la tige de piston (3) avec le moyeu d'axe de piston (4), est munie, côté entrée, d'un évidement (8) en forme de fenêtre,
    la partie de paroi (7), assemblant la tige de piston (3) avec le moyeu d'axe de piston (4) et distante du côté entrée, a une réalisation fermée,
    la partie de paroi fermée (7), par rapport à la longueur de tige, est relevée vers le haut (10) à partir de l'extrémité ouverte (9) de la tige.
EP96945490A 1995-10-16 1996-10-10 Piston en metal leger coule pour moteur deux temps Expired - Lifetime EP0856100B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19538407 1995-10-16
DE19538407A DE19538407A1 (de) 1995-10-16 1995-10-16 Gegossener Leichmetallkolben für einen 2-Takt-Motor
PCT/DE1996/001937 WO1997014880A2 (fr) 1995-10-16 1996-10-10 Piston en metal leger coule pour moteur deux temps

Publications (2)

Publication Number Publication Date
EP0856100A2 EP0856100A2 (fr) 1998-08-05
EP0856100B1 true EP0856100B1 (fr) 1999-05-06

Family

ID=7774935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96945490A Expired - Lifetime EP0856100B1 (fr) 1995-10-16 1996-10-10 Piston en metal leger coule pour moteur deux temps

Country Status (6)

Country Link
US (1) US5979391A (fr)
EP (1) EP0856100B1 (fr)
BR (1) BR9610972A (fr)
DE (2) DE19538407A1 (fr)
ES (1) ES2134029T3 (fr)
WO (1) WO1997014880A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
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 (de) * 2007-07-06 2009-04-15 Mahle Kinig Kommanditgesellsch Kolben
US8807109B2 (en) * 2009-11-06 2014-08-19 Federal-Mogul Corporation Steel piston with cooling gallery and method of construction thereof
DE102010008260B4 (de) * 2010-02-17 2021-08-19 Andreas Stihl Ag & Co. Kg Zweitaktmotor
EP3284939B1 (fr) 2016-08-19 2020-07-15 Andreas Stihl AG & Co. KG Piston pour un moteur a deux temps dote d'un pot catalytique et moteur deux temps
EP3284938B1 (fr) * 2016-08-19 2020-10-07 Andreas Stihl AG & Co. KG Piston pour un moteur a deux temps dote d'un pot catalytique et moteur deux temps
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1081882A (fr) * 1953-05-09 1954-12-23 Dispositif particulière des canaux de transfert des gaz sur un moteur à combustioninterne
US3257997A (en) * 1965-02-04 1966-06-28 Mcculloch Corp Piston for internal combustion engine
DE1301658B (de) * 1966-02-02 1969-08-21 Mahle Kg Zweitaktbrennkraftmaschine
JPS5840649B2 (ja) * 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 ベンソウチ
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 (de) * 1984-08-17 1986-02-27 Mahle Gmbh, 7000 Stuttgart Tauchkolben fuer verbrennungsmotoren
GB8724026D0 (en) * 1987-10-13 1987-11-18 T & N Technology Ltd Pistons
JP2561798Y2 (ja) * 1989-05-22 1998-02-04 株式会社ユニシアジェックス エンジン用ピストン
DE4342044B4 (de) * 1993-12-09 2006-08-31 Mahle Gmbh Kolben für einen Verbrennungsmotor
JPH07293325A (ja) * 1994-04-20 1995-11-07 Aisin Seiki Co Ltd 内燃機関のピストン
DE4434994C2 (de) * 1994-09-30 1998-02-19 Porsche Ag Kolben für Brennkraftmaschinen
DE4446726A1 (de) * 1994-12-24 1996-06-27 Mahle Gmbh Verfahren zur Herstellung eines einteiligen Kühlkanalkolbens
JPH08211471A (ja) * 1995-02-07 1996-08-20 Olympus Optical Co Ltd 沈胴式カメラ

Also Published As

Publication number Publication date
DE59601840D1 (de) 1999-06-10
DE19538407A1 (de) 1997-04-17
WO1997014880A3 (fr) 1997-06-05
BR9610972A (pt) 1999-03-02
WO1997014880A2 (fr) 1997-04-24
ES2134029T3 (es) 1999-09-16
EP0856100A2 (fr) 1998-08-05
US5979391A (en) 1999-11-09

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