EP2783096A1 - Piston pour moteur à combustion interne - Google Patents

Piston pour moteur à combustion interne

Info

Publication number
EP2783096A1
EP2783096A1 EP12778205.0A EP12778205A EP2783096A1 EP 2783096 A1 EP2783096 A1 EP 2783096A1 EP 12778205 A EP12778205 A EP 12778205A EP 2783096 A1 EP2783096 A1 EP 2783096A1
Authority
EP
European Patent Office
Prior art keywords
piston
ratio
shaft
shaft elements
internal combustion
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Withdrawn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
EP12778205.0A
Other languages
German (de)
English (en)
Inventor
Markus Alexander HIRSCH
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 International GmbH
Original Assignee
Mahle International 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 International GmbH filed Critical Mahle International GmbH
Publication of EP2783096A1 publication Critical patent/EP2783096A1/fr
Withdrawn legal-status Critical Current

Links

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 
    • F02F3/0015—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
    • 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 
    • 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

Definitions

  • the invention relates to a piston for an internal combustion engine with a piston head, to which a ring section and a piston shaft connect radially outside, wherein the piston shaft consists of two opposing shaft elements which adjoin pin hubs, each with a pin bore.
  • a piston of the type mentioned is known from the published patent application DE 4326978.
  • the disadvantage here is that the shaft elements are formed very solid in the region of the ring part, so that arise at a temperature-related, radial expansion of the piston between the cylinder wall and piston shaft stresses that increase the pressure of the shaft elements on the cylinder inner wall, thus increasing the friction losses and as a result of which increase the CO2 emission of the engine equipped with the known piston.
  • the shaft elements have inner surfaces which define radially inwardly those regions of the shaft elements in which the shaft elements are thinner than 7% of the piston diameter "D", that the shaft elements have outer surfaces that those areas of the shaft elements bounded radially outwardly, which lie in the circumferential direction outside of both sides of the pin bore axis lying angular ranges, the angular ranges of the pin bore axis and perpendicular to the piston axis and the pin bore axis intersecting straight lines, which are viewed in the circumferential direction on both sides of the pin bore axis, and each make an angle of more than 40 ° with the pin bore axis, and that the ratio of the contents of the inner surfaces to the ratio of the contents of the outer surfaces is more than 60%.
  • FIG. 1 is a perspective view of a piston for a diesel engine according to the invention
  • Fig. 2 is a section through the piston of FIG. 1 along a plane which
  • Fig. 3 is a side view of the piston with a representation of the outer surface
  • Fig. 4 is an interior view of the shaft member.
  • Fig. 1 and Fig. 2 show a piston 1 for a diesel engine made of aluminum, in the piston head 2, a combustion bowl 3 and four valve pockets 4, 4 ', 4 ", 4"' are formed. Radially outside close to the piston head 2, a top land 5, a ring section 6 and a piston shaft 7 at.
  • the piston skirt 7 consists of two opposite shaft elements 8 and 9 which adjoin pin bosses 10, 11, each with a pin bore 12, 13. Can be seen in Fig. 1, the outer surface 14 of the shaft member. 8
  • FIG. 1 Shown in FIG. 1 are lines 21, 21 'serving as auxiliary lines, which are perpendicular to the piston axis 16 and intersect the pin bore axis 15, which are arranged on both sides of the pin bore axis 15 in the circumferential direction. and the angular regions 20 lying on both sides of the pin bore axis 15,
  • FIG. 2 shows the piston 1 in section along a plane which is perpendicular to the pin bore axis 15 and on the piston axis 16.
  • the shaft elements 8, 9, which are shown in section, have a cross-section whose radial diameter decreases towards the lower end facing away from the piston bottom.
  • the thickness "S” is the shaft members 8 and 9
  • the maximum thickness "S" of the shaft elements 8, 9 in the area of the inner surfaces 17, 18 must be less than 7% of the piston diameter "D".
  • a side view of the piston 1 shows the outer surface 14 of the shaft member 8, while Fig. 4 shows the inner surface 17 of the shaft member 8, wherein the surface 17 is equivalent to the region of the shaft member 8, in which the shaft member Thinner than 7% of the piston diameter "D.”
  • the ratio of the content of the surface 17 to the content of the surface 14 is more than 60%, preferably between 65% and 78%, which also means the ratio of the content of the inner surface 18 to the content
  • the size ratio of the inner surface 17, 18 to the outer surface 14, 19 of the shaft elements according to the invention is accordingly to be found in the shaft element of the pressure side and in the shaft element of the counter pressure side or in both shaft elements.
  • the outer surfaces 14, 19 of the shaft elements 8, 9 on the wall of a cylinder liner of an internal combustion engine which in the engine operation due to the greater radial thermal expansion of the piston 1 with respect to the opposite lower, radial thermal expansion of a ferrous material existing cylinder bushing in the shaft elements 8, 9 give contact forces, so that the shaft elements 8, 9 with increasing heating be pressed with increasing force on their outer surfaces 14, 19 on the inner surface of the cylinder liner, which increases the friction losses of the piston 1 in engine operation and thus the CO 2 emissions of the engine.
  • the shaft elements are dimensioned as described above, which causes the shaft elements are designed to be more elastic, so that they give way at the temperature-induced expansion of the piston, whereby the force, with the press the shaft elements on the cylinder inner surface, so that the friction losses in engine operation and thus ultimately the CO 2 emissions of the engine can be reduced.
  • the piston shape is designed so that the hard shaft part, whose thickness is greater than 7% of the piston diameter, so much clearance is given that this game is sufficient so that this area of the hard shaft part experiences no direct compressive stresses on the contact between the piston and cylinder when the piston expands due to temperature.
  • the soft shaft part must be at least 60% of the entire shaft.

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)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

L'invention concerne un piston (1) pour un moteur à combustion interne doté d'éléments de tige (8, 9) comprenant d'une part des surfaces intérieures (17, 18) correspondant aux zones des éléments de tige (8, 9) dans lesquelles l'épaisseur des éléments de tige (8, 9) est inférieure à 7 % du diamètre du piston « D », et comprenant d'autre part des surfaces extérieures (14, 19) délimitant radialement vers l'extérieur les zones des éléments de tige (8, 9) qui, vues dans le sens périphérique sont situées en dehors de secteurs angulaires (20, 20') supérieurs à 40°, situés de part et d'autre de l'axe d'alésage de boulon (15). Le rapport du contenu de la surface intérieure (17, 18) au rapport du contenu de la surface extérieure (14, 19) est supérieur à 60 %. Pour cette raison, les éléments de tige sont élastiques, ce qui réduit la pression exercée par les éléments de tige sur la paroi intérieure cylindrique, en cas de dilatation radiale de la tige de piston provoquée par la température, les pertes par frottement du piston et donc l'émission de C02 du moteur équipé des pistons selon l'invention étant réduites.
EP12778205.0A 2011-09-28 2012-09-14 Piston pour moteur à combustion interne Withdrawn EP2783096A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011115639A DE102011115639A1 (de) 2011-09-28 2011-09-28 Kolben für einen Verbrennungsmotor
PCT/DE2012/000920 WO2013044897A1 (fr) 2011-09-28 2012-09-14 Piston pour moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2783096A1 true EP2783096A1 (fr) 2014-10-01

Family

ID=47075981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12778205.0A Withdrawn EP2783096A1 (fr) 2011-09-28 2012-09-14 Piston pour moteur à combustion interne

Country Status (7)

Country Link
US (1) US9243583B2 (fr)
EP (1) EP2783096A1 (fr)
JP (1) JP2014532137A (fr)
CN (1) CN103890362A (fr)
BR (1) BR112014007441A2 (fr)
DE (1) DE102011115639A1 (fr)
WO (1) WO2013044897A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013214738A1 (de) * 2013-07-29 2015-01-29 Federal-Mogul Nürnberg GmbH Leichtbau eines Dieselkolbens
KR20160083067A (ko) * 2013-11-07 2016-07-11 페더럴-모걸 코오포레이숀 모놀리식 갤러리리스 피스톤 및 그 제작 방법
USD792469S1 (en) * 2015-03-26 2017-07-18 Cummins Inc. Combustion bowl
US10233865B2 (en) 2016-09-30 2019-03-19 Mahle International Gmbh Piston crown having conical valve pocket
USD897373S1 (en) * 2018-09-22 2020-09-29 Chaoming Li Piston
GB2580905B (en) * 2019-01-25 2021-08-11 Jaguar Land Rover Ltd Piston for an internal combustion engine
GB2580694B (en) * 2019-01-25 2022-01-05 Jaguar Land Rover Ltd Piston for an internal combustion engine
USD1009938S1 (en) * 2022-05-24 2024-01-02 Reme, Llc Elliptical piston for a rotary steerable tool

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070095202A1 (en) * 2005-11-03 2007-05-03 Donahue Richard J Piston

Family Cites Families (24)

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US1788668A (en) * 1924-05-31 1931-01-13 Ford Motor Co Piston for internal-combustion engine
JPS6327080Y2 (fr) * 1980-06-23 1988-07-22
EP0050257A1 (fr) * 1980-10-17 1982-04-28 Mahle Gmbh Piston léger pour moteurs à combustion interne
JPS58180353U (ja) 1982-05-27 1983-12-02 日産自動車株式会社 内燃機関のピストン
DE3885765T2 (de) * 1988-10-21 1994-06-09 Caterpillar Inc., Peoria, Ill. Brennkraftmaschine mit einem kolben, versehen mit einer hoch angeordneten ringnut.
US5076225A (en) * 1989-12-28 1991-12-31 Toyota Jidosha Kabushiki Kaisha Piston for an internal combustion engine
JPH06346787A (ja) * 1993-06-10 1994-12-20 Toyota Motor Corp 内燃機関のピストン
DE4326978A1 (de) * 1993-08-11 1995-02-16 Alcan Gmbh Kolben für Brennkraftmaschinen, insbesondere für Dieselmotoren
JP3541511B2 (ja) * 1995-07-07 2004-07-14 いすゞ自動車株式会社 ピストン
DE19643778C2 (de) * 1996-10-23 2000-04-13 Alcan Gmbh Leichtbaukolben
JP2000008948A (ja) * 1998-04-21 2000-01-11 Nissan Motor Co Ltd 内燃機関のピストン
US6164261A (en) * 1999-02-10 2000-12-26 Caterpillar Inc. Internal combustion engine piston assembly and method
CN1331384A (zh) * 2000-06-22 2002-01-16 刘俊明 往复式活塞与气缸无隙配合技术及无隙配合活塞
DE10063568A1 (de) * 2000-12-20 2002-07-04 Mahle Gmbh Kühlkanalkolben für einen Dieselmotor mit Direkteinspritzung mit einem Kolbendurchmesser von 100 mm
JP2002332912A (ja) * 2001-04-30 2002-11-22 Honda Motor Co Ltd 内燃機関用ピストン
US6526871B1 (en) 2001-08-24 2003-03-04 Federal-Mogul World Wide, Inc. Monobloc piston for diesel engines
CN2527726Y (zh) * 2001-12-21 2002-12-25 周芝山 一种汽油机活塞
DE102005042857A1 (de) 2005-09-08 2007-03-22 Ks Kolbenschmidt Gmbh Kolben für eine Brennkraftmaschine
US7302884B2 (en) * 2005-11-03 2007-12-04 Dresser, Inc. Piston
DE102006029040A1 (de) * 2006-06-24 2008-01-03 Schaeffler Kg Kolben, insbesondere für eine Brennkraftmaschine
CN201025151Y (zh) * 2007-05-22 2008-02-20 郑庆和 活塞
DE102007031581A1 (de) * 2007-07-06 2009-01-08 Ks Kolbenschmidt Gmbh Kolben einer Brennkraftmaschine mit einer erhöhten Schrägstellung der Kastenwände des Kolbens
DE102008006854A1 (de) * 2008-01-31 2009-08-06 Bayerische Motoren Werke Aktiengesellschaft Kolben mit Drahtkissenkörper
KR20120062831A (ko) * 2009-08-27 2012-06-14 페더럴-모걸 코오포레이숀 저마찰 스커트를 가진 일체주조의 피스톤

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070095202A1 (en) * 2005-11-03 2007-05-03 Donahue Richard J Piston

Also Published As

Publication number Publication date
JP2014532137A (ja) 2014-12-04
US9243583B2 (en) 2016-01-26
DE102011115639A1 (de) 2013-03-28
US20140238333A1 (en) 2014-08-28
WO2013044897A1 (fr) 2013-04-04
BR112014007441A2 (pt) 2017-04-04
CN103890362A (zh) 2014-06-25

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