EP0385390A1 - Erleichteter Kolben - Google Patents

Erleichteter Kolben Download PDF

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Publication number
EP0385390A1
EP0385390A1 EP90103785A EP90103785A EP0385390A1 EP 0385390 A1 EP0385390 A1 EP 0385390A1 EP 90103785 A EP90103785 A EP 90103785A EP 90103785 A EP90103785 A EP 90103785A EP 0385390 A1 EP0385390 A1 EP 0385390A1
Authority
EP
European Patent Office
Prior art keywords
piston
ribs
skirt
portions
supports
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Withdrawn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
EP90103785A
Other languages
English (en)
French (fr)
Inventor
Umberto Panzeri
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.)
Dott Vittorio Gilardoni SpA
Original Assignee
Dott Vittorio Gilardoni SpA
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 Dott Vittorio Gilardoni SpA filed Critical Dott Vittorio Gilardoni SpA
Publication of EP0385390A1 publication Critical patent/EP0385390A1/de
Withdrawn legal-status Critical Current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 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • 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 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • 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 present invention concerns a lightened piston for internal combustion reciprocating engines of the so-called "H" type, namely of the type in which a portion of the skirt is missing, and therefore only two opposed portions of skirt with limited circumferential extension are present.
  • Said two remaining portions of skirt act as guide shoe and, due to the fact that during engine operation they must mate the cylindrical shape of the barrel, in rest cold conditions their shape does not exactly match the cylindrical barrel, but they are shaped in a way as to allow some clearance with respect to said barrel.
  • the value of said clearance is exactly calculated during designing, in order to take into consideration the thermal expansion of the material at the engine operative temperature and thus to obtain, at said temperature, perfect adhesion of said skirt portions to the cylinder walls.
  • H-shaped pistons are generally provided with reinforcing or stiffening members, or ribs, which join to each other the opposed portions of the skirt. Said ribs have a rectilinear configuration and extend between the corresponding ends of the opposed portions of skirt, being at the same time joined to piston the pin supports.
  • the ribs as well are subject to thermal expansion and the effects of said expansion have to be summed to those resulting from the thermal expansion of the skirt portions.
  • the ribs because of their rectilinear structure, when they are submitted to thermal expansion, the ribs press on the skirt portions which are then pushed outwards to a much greater extent than it occurs for the thermal expansion of the skirt portions only.
  • the union point between ribs and pin supports, in the vicinity of the center line of the supports, results to be offset with respect to the actual point of highest stress experienced by the piston pin supports, which point results to be located in correspondence to the area near the internal face of each support.
  • An object of the present invention is therefore to solve the abovesaid problems providing an "H" piston which may assure optimal adhesion between skirt and cylinder walls in a wide range of temperatures around the operative temperature.
  • Another object of the present invention is to provide an "H" piston with ribs forming a not extremely rigid structure and joined to the piston pin supports in correspondence to the point of maximum stress.
  • the invention concerns a piston for internal combustion reciprocating engines, of the so-­called "H" type, namely of the type in which two opposed portions of skirt are provided, with limited circumferential extension, connected by a couple of reinforcing members, or ribs, characterized in that said ribs have a curvilinear and/or broken configuration, at least two sections of which present extensions forming an angle between each other.
  • the present invention allows to provide a piston having lower sensitivity to temperature deviations from the design temperature, a less rigid structure and better absorption of the stresses localized on the piston pin supports.
  • the piston according to the invention when the piston according to the invention is in the vicinity of the Bottom Dead Center, it is possible to have a wider surface for the passage of the transfer flow between crankcase and combustion chamber, in that to the space for the main transfers provided in the cylinder, the space allowed by the particular configuration of the ribs is added.
  • the piston 1, of the so-called "H" type is provided without the skirt areas placed in correspondence to the pin supports 6, and only presents two opposed portions of skirt 3, 3′, joined by a couple of reinforcing members, or ribs, 4.
  • the ribs 4 have a curvilinear and/or broken configuration, and at least two sections of said ribs have such directions as to form an angle between each other.
  • each rib portion 4 comprised between each skirt portion 3, 3′ and the corresponding side of the piston pin support 6 presents a point of direction change of the rib itself.
  • each portion 4 presents at least a point in which the rib changes direction and forms two sections positioned according two directions forming an angle between each other. As better described later on, said sections can be either rectilinear or curvilinear.
  • the ribs 4 connect the ends of the two opposed portions of skirt with relevant supports specularly between each other and according to a "leaf spring" configuration. Namely, the ribs 4, starting from the ends 7 of a skirt portion 3, first of all bend towards the inside joining with the more internal side of the supports 6 and then go towards the other skirt portion 3′ in a way as to form a second curve, specular to the first one, extending as far as the ends 8 of the skirt portion 3′.
  • flex points are present, namely four points of change of inclination located between each support 6 and each skirt portion 3, 3′, but it is obvious that any curvilinear or broken configuration may be used which may allow to reduce the effects of the temperature deviation from the design temperture in the abovedescribed way and which at the same time reduces the stiffness of the skirt-ribs structure in comparison with the traditional "H" pistons.
  • Figures 3 to 6 show alternative embodiments of a piston according to the invention.
  • the rib presents a configuration which follows a broken line formed by three rectilinear portions 9, 9′ and 10, one of which, namely portion 10, lies in correspondence to the pin supports 6 and is essentially perpendicular to their axis.
  • Said portion 10 of the ribs 4 is also present in the embodiment of figure 4, where however the remaining sections of the rib, namely portions 11 and 12′ (corresponding to the portions 9 and 9′ of figure 3) have a curvilinear configuration so as to give the rib a mixed-­line configuration.
  • the ribs may be even not symmetrical (or specular) to the axis AA of the supports 6, as shown in figure 5.
  • the rib sections 12 and 13 provided in one half of the piston must not necessarily be specular to similar sections 12′ and 13′ provided in the other half of the piston with respect to the section B-B.
  • Figure 7 shows a piston according to the invention, housed in a cylinder 14 for two-stroke engines. As it can be noticed, it allows to add to the space due to transfers 15 a further space which, in the vicinity of the Bottom Dead Center, assures a wider surface for the passage of the transfer flow between crankcase and combustion chamber.
  • the piston according to the present invention is preferably manufactured in light alloy.

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)
EP90103785A 1989-03-03 1990-02-27 Erleichteter Kolben Withdrawn EP0385390A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1964989 1989-03-03
IT8919649A IT1228961B (it) 1989-03-03 1989-03-03 Pistone alleggerito.

Publications (1)

Publication Number Publication Date
EP0385390A1 true EP0385390A1 (de) 1990-09-05

Family

ID=11160073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103785A Withdrawn EP0385390A1 (de) 1989-03-03 1990-02-27 Erleichteter Kolben

Country Status (2)

Country Link
EP (1) EP0385390A1 (de)
IT (1) IT1228961B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109160A1 (de) * 1991-03-20 1992-09-24 Alcan Gmbh Kolben fuer brennkraftmaschinen
EP0705968A1 (de) * 1994-09-30 1996-04-10 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Kolben für Brennkraftmaschinen
EP0838587A1 (de) 1996-10-23 1998-04-29 Alcan Deutschland Gmbh Leichtbaukolben
EP1348859A3 (de) * 2002-03-25 2003-11-26 Bombardier-Rotax GmbH & Co. KG Kolben
WO2007031188A1 (de) * 2005-09-14 2007-03-22 Gm Global Technology Operations, Inc. Kolben für eine brennkraftmaschine
US7441958B2 (en) 2000-09-29 2008-10-28 Federal-Mogul Wiesbaden Gmbh & Co. Welded collar bearing method for producing welded collar bearings and a device for carrying out said method
DE102007020447A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102009019688A1 (de) 2009-04-30 2010-11-11 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
WO2013020882A1 (de) * 2011-08-11 2013-02-14 Mahle International Gmbh Kolben
CN103233828A (zh) * 2013-04-28 2013-08-07 石家庄金刚凯源动力科技有限公司 用于潍柴wp10系列柴油机的活塞
JP2015132248A (ja) * 2014-01-16 2015-07-23 日立オートモティブシステムズ株式会社 内燃機関のピストン
WO2017045991A1 (de) * 2015-09-18 2017-03-23 Mahle International Gmbh Kolben für eine brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH109750A (de) * 1924-04-23 1925-04-16 Nova Werke A G Kolben für Verbrennungsmotoren.
US2066613A (en) * 1926-03-01 1937-01-05 Ray E Day Piston
FR1046729A (fr) * 1950-07-25 1953-12-08 Nu Strut Flexible Piston Compa Perfectionnements aux pistons
US3319535A (en) * 1965-08-19 1967-05-16 Trw Inc Piston with undulated skirt
FR2182572A5 (de) * 1972-04-28 1973-12-07 Paterson Howard

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH109750A (de) * 1924-04-23 1925-04-16 Nova Werke A G Kolben für Verbrennungsmotoren.
US2066613A (en) * 1926-03-01 1937-01-05 Ray E Day Piston
FR1046729A (fr) * 1950-07-25 1953-12-08 Nu Strut Flexible Piston Compa Perfectionnements aux pistons
US3319535A (en) * 1965-08-19 1967-05-16 Trw Inc Piston with undulated skirt
FR2182572A5 (de) * 1972-04-28 1973-12-07 Paterson Howard

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109160A1 (de) * 1991-03-20 1992-09-24 Alcan Gmbh Kolben fuer brennkraftmaschinen
DE4109160C2 (de) * 1991-03-20 1993-06-17 Alcan Deutschland Gmbh, 3400 Goettingen, De
US5299490A (en) * 1991-03-20 1994-04-05 Alcan Deutschland Gmbh Piston with flush connecting wall sections at pin boss surface
DE4109160C3 (de) * 1991-03-20 2000-11-30 Federal Mogul Nuernberg Gmbh Kolben für Brennkraftmaschinen
DE4434994C2 (de) * 1994-09-30 1998-02-19 Porsche Ag Kolben für Brennkraftmaschinen
US5562074A (en) * 1994-09-30 1996-10-08 Dr.Ing. H.C.F. Porsche Ag Piston for internal-combustion engines
DE4434994A1 (de) * 1994-09-30 1996-04-11 Porsche Ag Kolben für Brennkraftmaschinen
EP0705968A1 (de) * 1994-09-30 1996-04-10 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Kolben für Brennkraftmaschinen
EP0838587A1 (de) 1996-10-23 1998-04-29 Alcan Deutschland Gmbh Leichtbaukolben
DE19643778A1 (de) * 1996-10-23 1998-05-07 Alcan Gmbh Leichtbaukolben
DE19643778C2 (de) * 1996-10-23 2000-04-13 Alcan Gmbh Leichtbaukolben
US6152017A (en) * 1996-10-23 2000-11-28 Alcan Deutschland Gmbh Lightweight piston
EP0838587B1 (de) * 1996-10-23 2001-04-04 Federal-Mogul Nürnberg GmbH Leichtbaukolben
US7441958B2 (en) 2000-09-29 2008-10-28 Federal-Mogul Wiesbaden Gmbh & Co. Welded collar bearing method for producing welded collar bearings and a device for carrying out said method
US6862977B2 (en) 2002-03-25 2005-03-08 Erp-Rotax Gmbh & Co. Kg Piston
EP1348859A3 (de) * 2002-03-25 2003-11-26 Bombardier-Rotax GmbH & Co. KG Kolben
US8286606B2 (en) 2005-09-14 2012-10-16 GM Global Technology Operations LLC Piston for an internal combustion engine
DE102005043747A1 (de) * 2005-09-14 2007-03-22 GM Global Technology Operations, Inc., Detroit Kolben für eine Brennkraftmaschine
WO2007031188A1 (de) * 2005-09-14 2007-03-22 Gm Global Technology Operations, Inc. Kolben für eine brennkraftmaschine
CN100582465C (zh) * 2005-09-14 2010-01-20 Gm全球科技运作股份有限公司 用于内燃机的活塞
DE102007020447A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102009019688A1 (de) 2009-04-30 2010-11-11 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
WO2013020882A1 (de) * 2011-08-11 2013-02-14 Mahle International Gmbh Kolben
US8752521B2 (en) 2011-08-11 2014-06-17 Mahle International Gmbh Piston
CN103233828A (zh) * 2013-04-28 2013-08-07 石家庄金刚凯源动力科技有限公司 用于潍柴wp10系列柴油机的活塞
CN103233828B (zh) * 2013-04-28 2015-06-03 石家庄金刚凯源动力科技有限公司 用于潍柴wp10系列柴油机的活塞
JP2015132248A (ja) * 2014-01-16 2015-07-23 日立オートモティブシステムズ株式会社 内燃機関のピストン
WO2017045991A1 (de) * 2015-09-18 2017-03-23 Mahle International Gmbh Kolben für eine brennkraftmaschine
US10711896B2 (en) 2015-09-18 2020-07-14 Mahle International Gmbh Piston for an internal combustion engine

Also Published As

Publication number Publication date
IT8919649A0 (it) 1989-03-03
IT1228961B (it) 1991-07-11

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