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EP0787898A1 - Piston articulé en plusieurs parties - Google Patents

Piston articulé en plusieurs parties Download PDF

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Publication number
EP0787898A1
EP0787898A1 EP97101072A EP97101072A EP0787898A1 EP 0787898 A1 EP0787898 A1 EP 0787898A1 EP 97101072 A EP97101072 A EP 97101072A EP 97101072 A EP97101072 A EP 97101072A EP 0787898 A1 EP0787898 A1 EP 0787898A1
Authority
EP
European Patent Office
Prior art keywords
pendulum
piston
piston according
shaft
intermediate component
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Withdrawn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
EP97101072A
Other languages
German (de)
English (en)
Inventor
Arno Kolb
Klaus Griesbach
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.)
Kolbenschmidt AG
Original Assignee
Kolbenschmidt 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 Kolbenschmidt AG filed Critical Kolbenschmidt AG
Publication of EP0787898A1 publication Critical patent/EP0787898A1/fr
Withdrawn legal-status Critical Current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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/0069—Multi-part pistons the crown and skirt being interconnected by the gudgeon pin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • 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
    • 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

Definitions

  • the invention relates to a pendulum-shaft piston, in particular for diesel engines with high supercharging, with an upper part forming the piston crown, the ring section and the top land and a lower part forming the piston skirt, which are connected to one another in an articulated manner by means of a piston pin, which in pin eyes of a pin chair belonging to the upper part and is stored in the pin boss of the lower part.
  • pendulum-shaft pistons with a one-piece forged steel upper part have already become known.
  • a forged steel top stands out against one cast steel upper part is characterized by higher strength values, but it is extremely expensive to manufacture. This means that undercuts cannot be made immediately, but have to be milled or turned afterwards. This is often not possible, since the bolt chair, which is very difficult to form itself with its flap-like design, severely limits access for machining tools.
  • the invention is therefore based on the object of improving a pendulum-shaft piston of the type mentioned at the outset with regard to more economical manufacture, the piston being to be at least equivalent to known piston in terms of load capacity and susceptibility to malfunction.
  • the upper part of the pendulum shaft piston according to the invention which forms the piston crown, the ring section and the top land, can be machined very well, since the accessibility for machining tools is not restricted by the bolt chair.
  • the upper part can also be very advantageously forged from steel, in particular from the tempering steel known under the designation 42 Cr Mo 4 V. Any necessary undercuts can then be cut in a turning process, or holes can be provided.
  • the invention offers the further advantage that the upper part forming the piston crown, the ring section and the top land, which in general is subject to faster wear than the intermediate component when subjected to extreme loads, can be exchanged for a new top. Due to the fact that the two parts can be assembled, it is possible to design a closed cooling space or cooling channel which is accessible and can be cleaned when the piston is overhauled.
  • the intermediate component is made from a cast iron material, in particular from cast iron with spheroidal graphite (GGG).
  • GGG cast iron with spheroidal graphite
  • the piston pin made of steel can run directly against the cast iron surfaces of the pin eyes; the use of a bearing bush is not necessary.
  • the upper part forming the piston crown, the ring section and the top land and the intermediate component are supported on one another via ring-shaped support surfaces and screwed together.
  • a central cooling space is provided between the piston crown and the intermediate component.
  • the intermediate component forms a radially inwardly extending bottom section of this central cooling space, which defines an oil outlet opening.
  • the bottom section can be from the outside be slightly inclined upwards against the horizontal. It is preferably molded onto the inside of a support collar forming the ring-shaped support surfaces.
  • the two-part design of the upper part advantageously allows an annular cooling channel to be defined or limited, the cooling channel being able to be produced by turning the upper part forming the piston crown, the ring section and the top land.
  • the intermediate component advantageously forms a bottom or delimits the cooling channel from below.
  • it has an edge region which forms an annular, rounded groove and is pulled upwards.
  • a cooling duct pendulum-shaft piston of the type mentioned above can be designed for the highest thermal stress by providing cooling bores in the upper part which extend from the inside of the cooling duct and extend behind the top land and which are arranged either parallel to the piston axis or slightly inclined to the outside can.
  • the above-mentioned upwardly drawn edge region of the intermediate part can form an outer support or support surface for the upper part.
  • the piston crown in the outer areas of the combustion bowl is relieved, so that there is the possibility, instead of the cooling bores, of expanding the cooling channel upwards behind the top land without the risk of piston crown breaks under heavy use.
  • the pendulum-shaft piston can also be designed in such a way that external support in the manner described only takes place under increased thermal loads, while in the cold state a gap is formed between the mentioned outer support surfaces of the intermediate part and the lower region of the ring section of the upper part of the piston.
  • An oscillating piston shown in FIG. 1 and designated overall by reference number 2 comprises an upper part 6 forming the piston crown 4, an intermediate component 10 forming the bolt seat 8 and a lower part 14 forming the piston skirt 12.
  • the upper part 6 and the intermediate component 10 to be assigned to it are as can be seen from the illustration on the right, screwed together using DIN screws 16, and the structural unit thus obtained is articulatedly connected to the lower part 14 via a piston pin, not shown, wherein in the intermediate component 10 or in the bolt chair 8 bolt eyes 18 for the Storage of the piston pin are formed.
  • the upper part 6 is preferably made of forged steel and is made from a steel disk blank.
  • the intermediate component 10 is preferably made of a cast iron material, such as spheroidal graphite cast iron (GGG).
  • the use of bushings for the piston pin is not necessary because the steel surface of the piston pin is good compared to cast iron "running".
  • the lower part 14 can consist of an aluminum alloy or of a cast iron material.
  • the intermediate component 10 has an annular disk-shaped support collar 20 which runs transversely to the piston axis, against which the upper part 6 rests with a complementary support surface 22 and is screwed together by means of the screws 16 mentioned.
  • the support surface 22 merges inwards into an annular collar 24 angled by 90 °, which engages in the support collar 20 and serves to center the upper part 6 with respect to the intermediate component 10.
  • the piston crown 4 of the upper part 6 delimits a central cooling space 26 which opens downwards from the upper part 6 and is therefore easy to manufacture.
  • This cooling space 26 is further delimited by a radially inwardly extending bottom section 28 of the intermediate component 10, as a result of which a central oil outlet opening 29 to the crankcase is defined.
  • the bottom section 28 of the intermediate component is molded onto the inside of the support collar 20. On its outside, the support collar 20 merges into an upwardly curved edge region 30 which, when the intermediate component is viewed from above, forms an annular groove in the piston axis direction which forms the base for an outer cooling channel 32.
  • the cooling channel 32 extends in the form of a likewise annular recess in the upper part 6, which was produced by turning, up to behind the top land 34. It can therefore be a very effective one Cooling of the piston crown 4 and the top land 34 and the ring section 36 can be achieved.
  • the cooling channel 32 is closed except for a very narrow gap 38 running in the horizontal direction between the upper part 6 and the intermediate component 10.
  • the oil supply takes place via a bore 40 which leads from the pin eye 18 to the cooling channel 32.
  • the central cooling chamber 26 does not have to be supplied by its own direct coolant supply channel, as in known pendulum-shaft pistons, but it is sufficient due to the extensive sealing of the cooling channel 32 to provide an overflow bore 42 between the cooling channel 32 and the central cooling chamber 26 in the upper part 6.
  • the embodiment of the pendulum-shaft piston according to the invention shown in FIG. 2 in two views differs from the embodiment described above in that instead of a continuously ring-shaped cooling bores 44 extending upward behind the top land in the piston axis direction, from the inside 45 of the cooling channel 46, there are provided cooling bores are.
  • the piston crown 48 of the upper part 50 is stiffened by the more or less strong webs remaining between the cooling bores 44, so that there is no risk of piston crown fractures in the outer region of the combustion chamber trough.
  • FIG. 3 shows two representations corresponding to FIGS. 1 and 2 of a further embodiment of the pendulum-shaft piston according to the invention, which differs from the pendulum-shaft piston shown in FIG. 1 in that the upper part 52 and the intermediate component 54 are supported internally and externally.
  • the inner support is designed as described in the embodiment according to FIG. 1, and the outer support takes place between the free end 56 of the upwardly extending edge area 60 of the intermediate component 54 and the cooling channel 58 and the lower end 63 of the ring section 64 facing away from the top land 62
  • the piston crown 66 in the outer region 67 of the combustion bowl 68 is relieved even under the highest thermal loads.
  • a stiffening by the arrangement of cooling bores and webs located between them is not required, but the cooling channel 58 can be extended to behind the ring section 64 and the top land 62.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP97101072A 1996-02-01 1997-01-24 Piston articulé en plusieurs parties Withdrawn EP0787898A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996103589 DE19603589A1 (de) 1996-02-01 1996-02-01 Pendelschaftkolben
DE19603589 1996-02-01

Publications (1)

Publication Number Publication Date
EP0787898A1 true EP0787898A1 (fr) 1997-08-06

Family

ID=7784238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101072A Withdrawn EP0787898A1 (fr) 1996-02-01 1997-01-24 Piston articulé en plusieurs parties

Country Status (2)

Country Link
EP (1) EP0787898A1 (fr)
DE (1) DE19603589A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002050414A1 (fr) * 2000-12-20 2002-06-27 Mahle Gmbh Piston a canal de refroidissement pour moteur diesel a injection directe
DE10218477A1 (de) * 2002-04-25 2003-11-20 Mahle Gmbh Gekühlter zweiteiliger Kolben
EP1097300B1 (fr) * 1998-07-16 2004-06-09 Federal-Mogul Corporation Piston dote d'un tuyau destine a fournir de l'huile de refroidissement a une tete
EP2028357A1 (fr) 2007-08-24 2009-02-25 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Piston pour moteur à combustion interne et procédé de fabrication d'un piston de ce type
WO2012062405A1 (fr) * 2010-11-11 2012-05-18 Daimler Ag Piston refroidi par liquide pour un moteur à combustion interne
US8973484B2 (en) 2011-07-01 2015-03-10 Mahle Industries Inc. Piston with cooling gallery
US9856820B2 (en) 2010-10-05 2018-01-02 Mahle International Gmbh Piston assembly
CN109519298A (zh) * 2017-09-19 2019-03-26 强莉莉 一种组合式活塞
WO2025003549A1 (fr) * 2023-06-27 2025-01-02 Wärtsilä Finland Oy Piston pour moteur à piston à combustion interne alternatif, moteur à combustion interne alternatif et utilisation dudit piston

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19739449A1 (de) * 1997-09-09 1999-03-11 Mahle Gmbh Dreiteiliger gebauter Kolben
US6279455B1 (en) * 1998-10-06 2001-08-28 Caterpillar Inc. Method and apparatus for making a two piece unitary piston
DE19855368C1 (de) * 1998-12-01 2000-07-06 Man B & W Diesel Ag Kolben für eine Verbrennungskraftmaschine
DE10117932A1 (de) * 2001-04-10 2002-10-17 Mahle Gmbh Kolben für Verbrennungsmotoren
DE102010015568A1 (de) 2010-04-19 2011-10-20 Ks Kolbenschmidt Gmbh Kolbenoberteil eines gebauten oder geschweißten Kolbens mit erweiterten Kühlräumen
DE102011013067A1 (de) 2011-03-04 2012-09-06 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor
DE102011013141A1 (de) 2011-03-04 2012-09-06 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor
DE102016120907A1 (de) 2015-11-02 2017-05-04 Ks Kolbenschmidt Gmbh Optimierte Nabenabstützung
DE102019215959A1 (de) * 2019-10-16 2021-04-22 Volkswagen Aktiengesellschaft Hubkolben für eine Hubkolbenbrennkraftmaschine sowie Verfahren zur Herstellung eines solchen Hubkolbens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528737A1 (fr) * 1982-06-16 1983-12-23 Berchem & Schaberg Gmbh Procede pour la fabrication d'une tete de piston pour un piston assemble
EP0185352A1 (fr) * 1984-12-20 1986-06-25 Societe D'etudes De Machines Thermiques S.E.M.T. Piston à structure allégée, notamment pour un moteur à combustion interne
EP0189767A2 (fr) * 1985-01-26 1986-08-06 M.A.N. - B&W Diesel GmbH Piston à plusieurs parties, refroidi par de l'huile, pour moteurs à combustion interne à piston alternatif
EP0330005A2 (fr) * 1988-02-26 1989-08-30 Wellworthy Limited Pistons
DE4010062A1 (de) * 1990-03-29 1991-10-02 Mahle Gmbh Gekuehlter tauchkolben fuer verbrennungsmotoren mit voneinander getrenntem kolbenoberteil und kolbenschaft
EP0464626A1 (fr) * 1990-06-29 1992-01-08 KOLBENSCHMIDT Aktiengesellschaft Piston assemblé refroidi par huile pour moteur diesel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE380543C (de) * 1914-05-25 1923-09-08 Oliver Edward Barthel Zweiteiliger Kolben
US1409754A (en) * 1920-02-26 1922-03-14 Morgan Edward Piston
US2273986A (en) * 1940-03-25 1942-02-24 C C Saunders Piston
DE2730071A1 (de) * 1977-07-02 1979-01-04 Maschf Augsburg Nuernberg Ag Mehrteiliger kolben fuer brennkraftmaschinen
DE3834852A1 (de) * 1988-10-13 1990-04-19 Mahle Gmbh Gekuehlter zweiteiliger tauchkolben

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2528737A1 (fr) * 1982-06-16 1983-12-23 Berchem & Schaberg Gmbh Procede pour la fabrication d'une tete de piston pour un piston assemble
EP0185352A1 (fr) * 1984-12-20 1986-06-25 Societe D'etudes De Machines Thermiques S.E.M.T. Piston à structure allégée, notamment pour un moteur à combustion interne
EP0189767A2 (fr) * 1985-01-26 1986-08-06 M.A.N. - B&W Diesel GmbH Piston à plusieurs parties, refroidi par de l'huile, pour moteurs à combustion interne à piston alternatif
EP0330005A2 (fr) * 1988-02-26 1989-08-30 Wellworthy Limited Pistons
DE4010062A1 (de) * 1990-03-29 1991-10-02 Mahle Gmbh Gekuehlter tauchkolben fuer verbrennungsmotoren mit voneinander getrenntem kolbenoberteil und kolbenschaft
EP0464626A1 (fr) * 1990-06-29 1992-01-08 KOLBENSCHMIDT Aktiengesellschaft Piston assemblé refroidi par huile pour moteur diesel

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1097300B1 (fr) * 1998-07-16 2004-06-09 Federal-Mogul Corporation Piston dote d'un tuyau destine a fournir de l'huile de refroidissement a une tete
WO2002050414A1 (fr) * 2000-12-20 2002-06-27 Mahle Gmbh Piston a canal de refroidissement pour moteur diesel a injection directe
US6892689B2 (en) 2000-12-20 2005-05-17 Mahle Gmbh Cooling duct piston for a direct-injection diesel engine
KR100762527B1 (ko) * 2000-12-20 2007-10-01 말레 게엠베하 직접 분사식 디젤 엔진용 냉각 채널 피스톤
DE10218477A1 (de) * 2002-04-25 2003-11-20 Mahle Gmbh Gekühlter zweiteiliger Kolben
US7080610B2 (en) 2002-04-25 2006-07-25 Mahle Gmbh Cooled piston consisting of two parts
EP2028357A1 (fr) 2007-08-24 2009-02-25 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Piston pour moteur à combustion interne et procédé de fabrication d'un piston de ce type
WO2009040617A2 (fr) 2007-08-24 2009-04-02 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Piston pour moteur à combustion interne et procédé de fabrication d'un piston de ce type
US9856820B2 (en) 2010-10-05 2018-01-02 Mahle International Gmbh Piston assembly
WO2012062405A1 (fr) * 2010-11-11 2012-05-18 Daimler Ag Piston refroidi par liquide pour un moteur à combustion interne
US8973484B2 (en) 2011-07-01 2015-03-10 Mahle Industries Inc. Piston with cooling gallery
CN109519298A (zh) * 2017-09-19 2019-03-26 强莉莉 一种组合式活塞
WO2025003549A1 (fr) * 2023-06-27 2025-01-02 Wärtsilä Finland Oy Piston pour moteur à piston à combustion interne alternatif, moteur à combustion interne alternatif et utilisation dudit piston

Also Published As

Publication number Publication date
DE19603589A1 (de) 1997-08-07

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