EP0403767B1 - 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
EP0403767B1
EP0403767B1 EP90108027A EP90108027A EP0403767B1 EP 0403767 B1 EP0403767 B1 EP 0403767B1 EP 90108027 A EP90108027 A EP 90108027A EP 90108027 A EP90108027 A EP 90108027A EP 0403767 B1 EP0403767 B1 EP 0403767B1
Authority
EP
European Patent Office
Prior art keywords
cooling
piston
cooling chamber
chamber
oil
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 - Lifetime
Application number
EP90108027A
Other languages
German (de)
English (en)
Other versions
EP0403767A3 (fr
EP0403767A2 (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
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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
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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.
  • a piston is known from DE 38 30 033 A1.
  • 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, sets 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 generating 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.
  • the cooling oil is transferred from the cooling ring channel 4 into the central cooling chamber 5 via blind hole bores 6, which flow out of 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 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 8 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 structural design of the cooling oil guide means 4, 6, 7 and 5 including the cooling oil supply and discharge lines is coordinated with one another together with the set cooling oil flow rate in such a way that, during engine operation, the oil inside the cooling ring channel 4 and the blind holes 6 opening into it can shake freely.
  • 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 chamber 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 ensures an optimal shaker effect.
  • oil can flow radially inward 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 totalized 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)

Claims (3)

  1. Piston pour moteurs à combustion interne avec un courant d'huile de refroidissement dans la tête de piston, sur lequel les moyens de guidage d'huile de refroidissement se composent d'un conduit annulaire de refroidissement (4), fermé dans le sens radial externe, dans lequel débouchent, à partir de la tête de piston, des trous borgnes (6) essentiellement parallèles à l'axe longitudinal de ce dernier, et d'un espace de refroidissement central (5), relié par l'intermédiaire d'alésages transversaux radiaux (7), dans une zone supérieure de l'espace de refroidissement dirigée en direction de la tête de piston, à certains des trous borgnes (6) du moins, dans une zone distante de l'extrémité ouverte du trou borgne (6) respectif, l'huile de refroidissement étant envoyée dans les moyens de guidage d'huile, par un conduit d'arrivée fermé notamment, par l'intermédiaire de l'espace de refroidissement central (5), dans le sens radial interne, ou par l'intermédiaire du conduit annulaire de refroidissement (4) externe, dans le sens radial externe, et ne remplissant totalement les moyens de guidage d'huile de refroidissement dans aucun état de fonctionnement du piston, en vue de permettre un mouvement de secousses de l'huile, caractérisé en ce que, dans une zone inférieure de l'espace de refroidissement respectif (conduit annulaire de refroidissement (4) ou espace de refroidissement central (5)), dans lequel l'huile de refroidissement est d'abord envoyée, distante de la tête de piston par rapport à la zone supérieure de l'espace de refroidissement, un conduit de décharge (8) au moins débouche dans un espace en liaison gazeuse avec le carter-moteur, la section d'écoulement de ce conduit et/ou la section d'écoulement totalisée de ces conduits étant essentiellement inférieure à celle de la totalité des alésages transversaux radiaux (7), prévus entre les trous borgnes (6) et l'espace de refroidissement central (5).
  2. Piston suivant la revendication 1, caractérisé en ce que le conduit de décharge, au moins, débouche dans l'espace de refroidissement concerné (conduit annulaire de refroidissement (4) ou espace de refroidissement (5)) essentiellement dans le sens radial et à distance du fond de l'espace de refroidissement respectif.
  3. Piston suivant la revendication 2, caractérisé en ce que les conduits de décharge (8) relient l'espace annulaire de refroidissement externe (4) à l'espace de refroidissement central (5), les conduits de décharge débouchant dans l'espace de refroidissement central au-dessous des alésages transversaux (7), dans le sens axial.
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
DE3919872 1989-06-19
DE3919872A DE3919872A1 (de) 1989-06-19 1989-06-19 Tauchkolben fuer verbrennungsmotoren mit einem kuehloeldurchfluteten kolbenkopf

Publications (3)

Publication Number Publication Date
EP0403767A2 EP0403767A2 (fr) 1990-12-27
EP0403767A3 EP0403767A3 (fr) 1991-03-13
EP0403767B1 true 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111868367A (zh) * 2018-02-01 2020-10-30 大众汽车股份公司 用于往复活塞式内燃机的往复活塞以及往复活塞在往复活塞式内燃机中的用途

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4120850A1 (de) * 1991-06-25 1993-01-07 Kolbenschmidt Ag Gebauter, oelgekuehlter kolben fuer dieselmotoren
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
GB9909034D0 (en) * 1999-04-19 1999-06-16 Seneca Tech Ltd Piston coolant path
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
GB201217067D0 (en) * 2012-09-25 2012-11-07 British American Tobacco Co Heating smokable material

Family Cites Families (4)

* 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
DE3518721C3 (de) * 1985-05-24 1997-09-04 Man B & W Diesel Ag Ölgekühlter, mehrteiliger Tauchkolben einer Brennkraftmaschine
DE3643039A1 (de) * 1986-12-17 1988-06-30 Mahle Gmbh Kuehlbarer tauchkolben fuer verbrennungsmotoren
DE3830033C2 (de) * 1987-11-30 1998-05-07 Mahle Gmbh Gebauter, ölgekühlter Tauchkolben für Verbrennungsmotoren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111868367A (zh) * 2018-02-01 2020-10-30 大众汽车股份公司 用于往复活塞式内燃机的往复活塞以及往复活塞在往复活塞式内燃机中的用途

Also Published As

Publication number Publication date
JP2911549B2 (ja) 1999-06-23
EP0403767A3 (fr) 1991-03-13
DE3919872A1 (de) 1990-12-20
JPH0331566A (ja) 1991-02-12
EP0403767A2 (fr) 1990-12-27
DE59004281D1 (de) 1994-03-03

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