EP0064831B2 - Piston crown for an internal combustion engine - Google Patents

Piston crown for an internal combustion engine Download PDF

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Publication number
EP0064831B2
EP0064831B2 EP19820302122 EP82302122A EP0064831B2 EP 0064831 B2 EP0064831 B2 EP 0064831B2 EP 19820302122 EP19820302122 EP 19820302122 EP 82302122 A EP82302122 A EP 82302122A EP 0064831 B2 EP0064831 B2 EP 0064831B2
Authority
EP
European Patent Office
Prior art keywords
crown
piston
butt
head
support skirt
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
Application number
EP19820302122
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0064831A2 (en
EP0064831B1 (en
EP0064831A3 (en
Inventor
Yukio Terashima
Shinichiro Ban
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=13279113&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0064831(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0064831A2 publication Critical patent/EP0064831A2/en
Publication of EP0064831A3 publication Critical patent/EP0064831A3/en
Publication of EP0064831B1 publication Critical patent/EP0064831B1/en
Application granted granted Critical
Publication of EP0064831B2 publication Critical patent/EP0064831B2/en
Expired 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/10—Cooling by flow of coolant through 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 
    • F02F3/16—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

Definitions

  • the present invention relates to piston crowns for the piston of internal combustion engines.
  • piston crown 01 is formed with an annular support skirt 02, which projects form the inner surface 06 of the top (head) wall 05 said crown, the free edge of the skirt providing an annular butt surface 07 which is supported by the periphery of the upper (head) surface 03a of its associated piston rod 03.
  • the annular skirt 02 holds the crown spaced above the upper surface 03a of the piston rod, and the skirt 02 divides this space into coolant liquid chambers 08 and 09 which are connected by a coolant liquid passageway 04 which extends through said skirt 02.
  • gas pressure exerted upon the piston crown 01 is transmitted via the support skirt 02 to the piston rod 03.
  • An object of the present invention is to provide a piston crown, in which occurrence of fretting on the butt surface of the support skirt and/or the head surface of its associated piston rod can be prevented.
  • a piston crown for an internal combustion engine piston of the kind having an annular support skirt which projects from an inner surface of the top (head) wall of said crown with its free edge providing a flat butt surface which is only axially supported on the flat head surface of its associated piston rod, the annular butt surface and the piston rod being fastened together by means of a plurality of circumferentially spaced bolts, is characterised in that the annular support skirt is angled (or tilted) radially so that the inner and outer diameters of said annular support skirt at a point adjacent the inner surface of said head wall is larger than the inner and outer diameters thereof at a point where its butt surface engages said head surface of the piston rod, the angle is such that the bending moments working on the butt surface caused by the gas pressure exerted upon the outer surface of the crown and the gas pressure exerted upon the side surface of the crown offset each other, whereby uneven surface pressure and relative displacement in the radial direction between the support skirt and head surface is reduced to substantially zero for preventing the
  • the invention provides for the surface pressure on said butt surface to be kept constant against a varying load of gas pressure, so that displacement in the radial direction of said butt surface may be restricted to zero, or at least to a minute value, thereby virtually eliminating wear at this point, and consequently prolonging the life of the crown/piston rod assembly.
  • the present invention can be widely applied to internal combustion engines.
  • the piston crown 01 is basically similar to the known form described in Figure 1 and like parts have the same reference numbers.
  • the annular support skirt 02a is angled (or tilted), radially, as shown, so that its inner diameter 0 1 at the point adjacent the inner surface 06 of the head wall 05 of the crown is larger than its inner diameter D 2 at the point adjacent the head surface 03a of the piston rod 03.
  • the particular shape and dimensions of the above-described annular support skirt 02a for any particular application can be determined by a calculation method, such as a finite element method, or the like.
  • the annular butt surface 07 of the support skirt 02a butts against the peripheral part of the head surface 03a of the piston rod 03, and they are fastened together by means of a plurality of circumferentially spaced bolts 010.
  • piston crown 01 is basically similar to . the first embodiment, except that it is provided with two annular support skirts as shown, although in general any appropriate number of support skirts could be provided.
  • a further support skirt 015 of smaller diameter is provided and is fixed to the piston rod 03 by circumferentially spaced bolts 015.
  • the further skirt 014 divides the chamber 08 into two smaller chambers 08a and 08b and these are connected by a further coolant passageway 4a.
  • the inner diameters 0 1 and D 3 adjacent the surface 06 of the head wall 05 of the crown 01 of the larger diameter support skirt 02a and the smaller diameter support skirt 014, respectively, are formed larger than their respective inner diameters D 2 and D 4 adjacent the head surface 03a of the piston rod 03.
  • the fixing bolts 015 could be omitted, if necessary.

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)
EP19820302122 1981-05-07 1982-04-26 Piston crown for an internal combustion engine Expired EP0064831B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6516981U JPS57178150U (enExample) 1981-05-07 1981-05-07
JP65169/81U 1981-05-07

Publications (4)

Publication Number Publication Date
EP0064831A2 EP0064831A2 (en) 1982-11-17
EP0064831A3 EP0064831A3 (en) 1983-06-29
EP0064831B1 EP0064831B1 (en) 1985-10-23
EP0064831B2 true EP0064831B2 (en) 1990-01-31

Family

ID=13279113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820302122 Expired EP0064831B2 (en) 1981-05-07 1982-04-26 Piston crown for an internal combustion engine

Country Status (4)

Country Link
EP (1) EP0064831B2 (enExample)
JP (1) JPS57178150U (enExample)
DE (1) DE3266992D1 (enExample)
DK (1) DK151144C (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4333693B2 (ja) * 2006-05-22 2009-09-16 トヨタ自動車株式会社 内燃機関用ピストンおよび内燃機関
EP3301284B1 (en) * 2016-09-29 2020-11-25 Caterpillar Energy Solutions GmbH Piston with cooling arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR475903A (fr) * 1913-08-14 1915-06-24 Olav Eskil Jorgensen Piston pour moteurs à combustion interne
DE1949581A1 (de) * 1969-10-01 1971-04-08 Schmidt Gmbh Karl Kolben fuer Verbrennungskraftmaschinen
DE2038022A1 (de) * 1970-07-31 1972-02-03 Arendt, Rosemarie, 3001 Krahenwin kel Kolben fur Verbrennungsmotoren
DE2919638A1 (de) * 1979-05-16 1980-11-20 Schmidt Gmbh Karl Kolben fuer brennkraftmaschinen

Also Published As

Publication number Publication date
DK151144C (da) 1988-09-19
DE3266992D1 (en) 1985-11-28
EP0064831A2 (en) 1982-11-17
DK151144B (da) 1987-11-09
EP0064831B1 (en) 1985-10-23
EP0064831A3 (en) 1983-06-29
DK196482A (da) 1982-11-08
JPS57178150U (enExample) 1982-11-11

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