EP0403767A2 - Piston pour moteurs à combustion interne avec un courant d'huile de refroidissement dans la tête de piston - Google Patents

Piston pour moteurs à combustion interne avec un courant d'huile de refroidissement dans la tête de piston Download PDF

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Publication number
EP0403767A2
EP0403767A2 EP90108027A EP90108027A EP0403767A2 EP 0403767 A2 EP0403767 A2 EP 0403767A2 EP 90108027 A EP90108027 A EP 90108027A EP 90108027 A EP90108027 A EP 90108027A EP 0403767 A2 EP0403767 A2 EP 0403767A2
Authority
EP
European Patent Office
Prior art keywords
cooling
piston
oil
cooling oil
central
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.)
Granted
Application number
EP90108027A
Other languages
German (de)
English (en)
Other versions
EP0403767B1 (fr
EP0403767A3 (fr
Inventor
Alois Barth
Lothar Wiemann
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 GmbH
Original Assignee
Mahle 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6382976&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0403767(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP0403767A2 publication Critical patent/EP0403767A2/fr
Publication of EP0403767A3 publication Critical patent/EP0403767A3/fr
Application granted granted Critical
Publication of EP0403767B1 publication Critical patent/EP0403767B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02F3/225—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid the liquid being directed into blind holes

Definitions

  • the invention relates to a plunger for internal combustion engines with a piston head flooded with cooling oil according to the preamble of claim 1.
  • the object of the invention is to improve, in a piston with the cooling oil guiding means of the generic type, the cooling effect emanating from the cooling oil shaking in the blind holes on the piston head.
  • the purpose of the at least one proposed overflow channel is, in the case of cooling oil penetrating in the direction of the closed end of the blind bores into the cooling oil, which in this operating state is in the lower region of the cooling space which is supplied with oil from the outside and passes the cooling oil into the blind bores through a negative pressure caused by the To reduce ventilation flow flowing overflow channels.
  • Another effect of the overflow channels is that when the cooling oil flows through the piston into the floor area of the cooling space into which the cooling oil is first introduced, oil can flow out through the overflow channels, thereby creating additional cooling oil-free space in the cooling oil guide means can. It is important, however, that an excessive flow of oil cannot flow through the overflow channels, since this cooling oil practically flows out in a short circuit that is in principle undesirable.
  • the flow cross section of all overflow channel openings must therefore be substantially smaller than the total flow cross section of the cross bores connecting the blind bores with the central cooling space.
  • overflow channels open radially above the floor of the cooling space into which the cooling oil is introduced from the outside, the risk of an excessive short-circuit oil flow is already considerably reduced from the outset.
  • FIG. 1 An embodiment of the invention is shown in the drawing, which shows a longitudinal section through a piston.
  • the piston consists of a lower piston part 1, which is connected to a piston crown via expansion screws (not shown) extending in the longitudinal direction of the piston.
  • cooling ring channel 4 In the area of the piston ring grooves 3, between the lower part 1 and the piston crown 2, there is a cooling ring channel 4, delimited by both parts, into which cooling oil is pumped by the oil supply to the engine and which is passed from there into a central cooling chamber 5 between the piston crown 2 and the lower part 1 . From the central cooling chamber 5, the cooling oil flows back through a central opening to the oil supply source.
  • the transfer of the cooling oil from the cooling ring channel 4 into the central cooling chamber 5 takes place via blind hole bores 6, which flow out from the piston crown 2 into the cooling ring channel 4 approximately in the longitudinal direction of the piston and are distributed over the piston circumference and which are in turn connected to the central cooling chamber 5 via radial transverse bores 7. These transverse bores 7 open into the blind holes 6 approximately in the region of the closed ends thereof.
  • Overflow channels B lead from the lower area of the cooling ring channel 4 into the lower area of the central cooling room 5.
  • the overflow channels can also be formed by radial recesses in the axially superimposed surfaces of the piston crown 2 and the lower part 1 between the cooling ring channel 4 and the central cooling room 5.
  • the design of the cooling oil guide means 4, 6, 7 and 5 including the cooling oil supply and discharge lines is matched to one another together with the set cooling oil flow rate such that the oil within the cooling ring channel 4 and the blind bore holes 6 opening into it can shake freely during engine operation.
  • the overflow channels 8 serve to improve this shaker effect, which is important for intensive cooling of the piston crown part 2. These ensure pressure equalization between the cooling ring channel 4 and the central cooling space 5. When the cooling oil is moved out of the cooling ring channel 4 into the blind holes 6, this pressure equalization causes an inflow of air into the outer ring channel 4. This creates the possibility that that part of the oil in the blind holes 6 which has not passed through the transverse holes 7 to the central cooling chamber 5 can be thrown back into the outer cooling ring channel 4. This achieves an optimal shaker effect.
  • oil can flow radially inwards through the overflow channels 8 in this operating state and thereby create additional oil-free space within the cooling ring channel 4 and the blind holes 6 opening into it.
  • the flow cross section created by the overflow channels 8 is substantially smaller than that which is formed by the sum of the flow cross sections of the cross bores 7. It has proven to be advantageous to make the flow cross-section, which is formed by the overflow channels 8 distributed over the circumference, more than ten times smaller than the corresponding flow cross-section of the cross bores 7. In a specific exemplary embodiment, excellent cooling results were achieved with a cross-sectional ratio of the bores mentioned of 15: 1 achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP90108027A 1989-06-19 1990-04-27 Piston pour moteurs à combustion interne avec un courant d'huile de refroidissement dans la tête de piston Expired - Lifetime EP0403767B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3919872A DE3919872A1 (de) 1989-06-19 1989-06-19 Tauchkolben fuer verbrennungsmotoren mit einem kuehloeldurchfluteten kolbenkopf
DE3919872 1989-06-19

Publications (3)

Publication Number Publication Date
EP0403767A2 true EP0403767A2 (fr) 1990-12-27
EP0403767A3 EP0403767A3 (fr) 1991-03-13
EP0403767B1 EP0403767B1 (fr) 1994-01-19

Family

ID=6382976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108027A Expired - Lifetime EP0403767B1 (fr) 1989-06-19 1990-04-27 Piston pour moteurs à combustion interne avec un courant d'huile de refroidissement dans la tête de piston

Country Status (3)

Country Link
EP (1) EP0403767B1 (fr)
JP (1) JP2911549B2 (fr)
DE (2) DE3919872A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0520536A1 (fr) * 1991-06-25 1992-12-30 KOLBENSCHMIDT Aktiengesellschaft Piston assemblé refroidi par huile pour moteur Diesel
GB2349195A (en) * 1999-04-19 2000-10-25 Seneca Tech Ltd Piston with integral coolant ring gallery
RU2660005C2 (ru) * 2012-09-25 2018-07-04 Бритиш Америкэн Тобэкко (Инвестментс) Лимитед Нагревание курительного материала

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221240C2 (de) * 1992-06-27 2003-01-30 Mahle Gmbh Gekühlter zweiteiliger Kolben
DE4410141B4 (de) * 1994-03-24 2008-05-08 Mahle Gmbh Verschließen von herstellungsbedingten Bohrungen bei Kolben mit Kühlkanal
FI106396B (fi) * 1998-11-19 2001-01-31 Wecometal Oy Polttomoottorin mäntä
JP4965522B2 (ja) * 2008-07-09 2012-07-04 トヨタ自動車株式会社 ピストン用耐摩環
MD4134C1 (ro) * 2010-02-15 2012-05-31 Ион РАССОХИН Piston al motorului cu ardere internă
DE102018201556A1 (de) * 2018-02-01 2019-08-01 Volkswagen Aktiengesellschaft Hubkolben für eine Hubkolbenbrennkraftmaschine und Verwendung eines Hubkolbens in einer Hubkolbenbrennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407429A (en) * 1944-05-19 1946-09-10 Fairbanks Morse & Co Wrist pin assembly
FR2582351A1 (fr) * 1985-05-24 1986-11-28 Man B & W Diesel Gmbh Piston en plusieurs pieces, a refroidissement par l'huile, pour moteurs a combustion interne
DE3830033A1 (de) * 1987-11-30 1989-06-08 Mahle Gmbh Gebauter, oelgekuehlter kolben fuer verbrennungsmotoren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3643039A1 (de) * 1986-12-17 1988-06-30 Mahle Gmbh Kuehlbarer tauchkolben fuer verbrennungsmotoren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407429A (en) * 1944-05-19 1946-09-10 Fairbanks Morse & Co Wrist pin assembly
FR2582351A1 (fr) * 1985-05-24 1986-11-28 Man B & W Diesel Gmbh Piston en plusieurs pieces, a refroidissement par l'huile, pour moteurs a combustion interne
DE3830033A1 (de) * 1987-11-30 1989-06-08 Mahle Gmbh Gebauter, oelgekuehlter kolben fuer verbrennungsmotoren

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0520536A1 (fr) * 1991-06-25 1992-12-30 KOLBENSCHMIDT Aktiengesellschaft Piston assemblé refroidi par huile pour moteur Diesel
GB2349195A (en) * 1999-04-19 2000-10-25 Seneca Tech Ltd Piston with integral coolant ring gallery
GB2349195B (en) * 1999-04-19 2001-03-07 Seneca Tech Ltd Piston coolant gallery
US7281466B1 (en) 1999-04-19 2007-10-16 Seneca Technology, Ltd. Piston coolant gallery
RU2660005C2 (ru) * 2012-09-25 2018-07-04 Бритиш Америкэн Тобэкко (Инвестментс) Лимитед Нагревание курительного материала

Also Published As

Publication number Publication date
DE3919872A1 (de) 1990-12-20
EP0403767B1 (fr) 1994-01-19
JP2911549B2 (ja) 1999-06-23
EP0403767A3 (fr) 1991-03-13
JPH0331566A (ja) 1991-02-12
DE59004281D1 (de) 1994-03-03

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