EP2726724B1 - Piston with an undercrown support feature - Google Patents

Piston with an undercrown support feature Download PDF

Info

Publication number
EP2726724B1
EP2726724B1 EP12738286.9A EP12738286A EP2726724B1 EP 2726724 B1 EP2726724 B1 EP 2726724B1 EP 12738286 A EP12738286 A EP 12738286A EP 2726724 B1 EP2726724 B1 EP 2726724B1
Authority
EP
European Patent Office
Prior art keywords
piston
ribs
combustion
set forth
crown portion
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.)
Not-in-force
Application number
EP12738286.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2726724A1 (en
Inventor
Kurt Will
Mark BRANDT
Mike TEBBE
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.)
Federal Mogul LLC
Original Assignee
Federal Mogul LLC
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 Federal Mogul LLC filed Critical Federal Mogul LLC
Publication of EP2726724A1 publication Critical patent/EP2726724A1/en
Application granted granted Critical
Publication of EP2726724B1 publication Critical patent/EP2726724B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 
    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/28—Other pistons with specially-shaped head

Definitions

  • the present invention relates generally to pistons for internal combustion engines in accordance with the preamble of claim 1, to which EP 0 364 810 A2 is related.
  • pistons In order to strengthen their pistons to withstand the increased combustion pressures and temperatures, some piston manufacturers have begun to produce pistons with an increased combustion wall thickness. While such pistons may be resistant to bending under the increased pressures and temperatures, the increased thickness also gives the pistons an increased mass, which may detract from the power and fuel efficiency gains of from the advanced technologies.
  • a piston having a piston body which extends along a longitudinal central axis.
  • the piston body has a crown portion with a combustion wall and a pair of pin bosses which depend from the crown portion.
  • the crown portion includes at least two ribs formed integrally therewith with each rib depending from the combustion wall. One of the ribs depends (or extends) lower along the longitudinal central axis than the other of the ribs.
  • the ribs enhance the strength of the upper crown to resist bending about a pin bore axis without substantially increasing the mass of the piston. Additionally, the ribs act as a heat sink to extract heat away from the combustion wall and cool the piston.
  • the ribs extend between the pin bosses and bow outwardly from the pin bore axis.
  • the length of the ribs is increased without substantially increasing the mass of the piston.
  • a piston including a piston body extending along a longitudinal central axis and having a crown portion with a combustion wall and a pair of pin bosses depending generally from the crown portion.
  • the combustion wall includes at least one combustion bowl formed therein, and the crown portion includes at least one rib formed integrally therewith and depending from the combustion bowl directly beneath the at least one combustion bowl.
  • the at least one rib enhances the strength of the upper crown at the location of the combustion bowl, which often is located at the center of the combustion in the cylinder bore.
  • a piston 20 constructed in accordance with one presently preferred aspect of the invention is generally shown in Figures 1-5 .
  • the piston 20 of the exemplary embodiment is constructed of one integral piece which is preferably cast to a near-final shape then machined to its final dimensions.
  • the piston 20 could alternately be of multiple pieces which could be shaped and joined to one another through any desirable processes.
  • the piston 20 is preferably formed of an aluminum alloy but could alternately be of steel or any desirable metal or alloy thereof.
  • the exemplary one-piece piston 20 has a piston body 22 extending along a longitudinal central axis A 1 and having an upper crown portion 24, a pair of pin bosses 26 and a pair of skirt portions 28.
  • the upper crown portion 24 includes a combustion wall 30 and a plurality of ring grooves 32 spaced axially from the combustion wall 30 for receiving piston 20 rings (not shown).
  • the pin bosses 26 extend downwardly along the longitudinal central axis A 1 from the upper crown portion 24.
  • Each of the pin bosses 26 has a pin bore 34, and the pin bores 34 are aligned with one another along a pin bore axis A 2 (shown in Figure 3 ) for receiving a wrist pin (not shown) to interconnect the piston 20 with the small end of a connecting rod (not shown).
  • the skirt portions 28 are disposed diametrically opposite of one another with each skirt portion 28 extending between and interconnecting the pin bosses 26.
  • the piston body 22 reciprocates along the longitudinal central axis A 1 within a cylinder bore (not shown) of an engine block (not shown) to rotate a crankshaft (not shown) via the connecting rod (not shown).
  • the combustion wall 30 includes a generally planar portion, a raised portion (pop-up) and a combustion bowl 36 formed therein.
  • the combustion bowl 36 is configured asymmetrically relative to the longitudinal central axis A 1 , i.e. the center of the combustion bowl 36 is not disposed along the longitudinal central axis A 1 .
  • the combustion bowl 36 could alternately be disposed symmetrically about the central axis A 1 .
  • combustion of the fuel and gasses in the cylinder bore is often focused around the combustion bowl 36, thereby generating increased pressures and heat at this location.
  • the combustion bowl 36 is typically the highest stressed area on the crown portion 24
  • the exemplary piston 20 has an undercrown support structure for strengthening the upper crown portion 24 to resist these forces.
  • the piston 20 includes a pair of ribs 38, 40 spaced diametrically from one another and extending generally between the pin bosses 26 to reinforce the upper crown portion 24, thereby enhancing the upper crown portion's 24 resistance to bending about the pin bore axis A 2 when the combustion wall 30 is exposed to the increased pressures and temperatures of an engine with direct injection, a turbo-charger and/or a super-charger. This enhanced resistance to bending is achieved without a substantial increase in the mass of the piston 20 .
  • each of the ribs 38, 40 is generally bowed, or arc-shaped, to increase the area of support beneath the combustion wall 30, thereby further enhancing the upper crown's resistance to bending about the pin bore axis A 2 .
  • the arc-shape of the ribs 38, 40 also allows the ribs 38, 40 to generally smoothly mate, or be interconnected with, with the opposite pin bosses 26, thereby avoiding the creation of unwanted stresses at the intersection of these elements.
  • each of the ribs 38, 40 depends from and is integrally formed with the upper crown portion 24 .
  • the ribs 38, 40 may be formed "as cast" with the upper crown with little to no additional cost.
  • the ribs 38, 40 could be formed into the upper crown through any suitable process.
  • the ribs 38, 40 also may function as a heat sink to draw heat away from the combustion wall 30 of the upper crown to cool the combustion wall 30 . This heat-sink effect further enhances the piston's 20 resistance to the increased combustion temperatures.
  • the combustion wall 30 of the exemplary piston 20 is formed with a generally uniform thickness in both the location of the combustion bowl 36 and in the areas surrounding the combustion bowl 36 .
  • One of the ribs 38, 40 hereinafter referred to as a "first rib 38 ", depends from the combustion wall 30 directly beneath the combustion bowl 36 .
  • the first rib 38 is positioned to provide optimal support to the upper crown portion 24 at the location of its highest stresses.
  • the other rib hereinafter referred to as a “second rib 40 ", depends from the combustion wall 30 diametrically opposite of the first rib 38 and is spaced from the combustion bowl 36 .
  • the first rib 38 (which is directly beneath the combustion bowl 36 ) is recessed relative to the second rib 40 , i.e. the first rib 38 extends lower than the second rib 40.
  • the underside of the combustion wall 30 has an asymmetrical appearance as viewed in cross-section.
  • the first rib 38 arcs not only outwardly away from the pin bore axis A 2 but also vertically towards the pin bosses 26 of the piston body 22 .
  • the skirt portions 28 extend generally concentrically with the ribs 38, 40 .
  • the skirt portions 28 have the same or approximately the same radius of curvature as the ribs 38, 40 .
  • the skirt portions 28 do not have to be concentric with the ribs 38, 40 .

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)
EP12738286.9A 2011-06-29 2012-06-28 Piston with an undercrown support feature Not-in-force EP2726724B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161502602P 2011-06-29 2011-06-29
PCT/US2012/044564 WO2013003546A1 (en) 2011-06-29 2012-06-28 Piston with an undercrown support feature

Publications (2)

Publication Number Publication Date
EP2726724A1 EP2726724A1 (en) 2014-05-07
EP2726724B1 true EP2726724B1 (en) 2018-08-22

Family

ID=46551872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12738286.9A Not-in-force EP2726724B1 (en) 2011-06-29 2012-06-28 Piston with an undercrown support feature

Country Status (5)

Country Link
EP (1) EP2726724B1 (ko)
JP (2) JP6226866B2 (ko)
KR (1) KR20140032455A (ko)
CN (2) CN107842437B (ko)
WO (1) WO2013003546A1 (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017207005A1 (de) * 2017-04-26 2018-10-31 Federal-Mogul Nürnberg GmbH Einteiliger, gegossener Kolben für einen Verbrennungsmotor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010236406A (ja) * 2009-03-31 2010-10-21 Honda Motor Co Ltd ピストン

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB140651A (en) * 1919-05-22 1920-04-01 Albert Joseph Rath Improved construction of piston
GB399853A (en) * 1932-03-16 1933-10-16 Roland Claude Cross Improvements relating to pistons, especially applicable for internal combustion engines
JPS613946U (ja) * 1984-06-14 1986-01-11 日産ディーゼル工業株式会社 内燃機関のピストン
GB8824222D0 (en) * 1988-10-15 1988-11-23 Wellworthy Ltd Pistons
JPH08312454A (ja) * 1995-05-17 1996-11-26 Toyota Motor Corp 内燃機関のピストン
JPH09329056A (ja) * 1996-06-11 1997-12-22 Toyota Motor Corp 内燃機関用ピストン
JPH1018908A (ja) * 1996-07-01 1998-01-20 Hidaka Eng:Kk 内燃機関用ピストン
JP2001289117A (ja) * 2000-04-07 2001-10-19 Unisia Jecs Corp 内燃機関用ピストン
DE10244510A1 (de) * 2002-09-25 2004-04-08 Mahle Gmbh Einteiliger Kühlkanalkolben für einen Verbrennungsmotor
DE10244511A1 (de) * 2002-09-25 2004-04-15 Mahle Gmbh Mehrteiliger gekühlter Kolben für einen Verbrennungsmotor
US7406941B2 (en) * 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston
US7895937B2 (en) * 2006-11-08 2011-03-01 Federal-Mogul World Wide, Inc. Piston having twisted skirt panels
US7353797B1 (en) * 2007-02-28 2008-04-08 University Of Washington Combustion chamber for internal combustion engine
US7647911B2 (en) * 2007-08-08 2010-01-19 Federal-Mogul World Wide, Inc. Small end con rod guidance piston
US8042453B2 (en) * 2007-08-13 2011-10-25 Federal-Mogul Corporation Piston with a skirt having oil flow slots
JP2011185214A (ja) * 2010-03-10 2011-09-22 Honda Motor Co Ltd 内燃機関

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010236406A (ja) * 2009-03-31 2010-10-21 Honda Motor Co Ltd ピストン

Also Published As

Publication number Publication date
JP6226866B2 (ja) 2017-11-08
JP6396521B2 (ja) 2018-09-26
JP2014521000A (ja) 2014-08-25
JP2017115894A (ja) 2017-06-29
CN107842437A (zh) 2018-03-27
EP2726724A1 (en) 2014-05-07
WO2013003546A1 (en) 2013-01-03
KR20140032455A (ko) 2014-03-14
CN103748345A (zh) 2014-04-23
CN107842437B (zh) 2020-03-06

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