EP0285205B1 - Piston refroidi par liquide - Google Patents

Piston refroidi par liquide Download PDF

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Publication number
EP0285205B1
EP0285205B1 EP88200507A EP88200507A EP0285205B1 EP 0285205 B1 EP0285205 B1 EP 0285205B1 EP 88200507 A EP88200507 A EP 88200507A EP 88200507 A EP88200507 A EP 88200507A EP 0285205 B1 EP0285205 B1 EP 0285205B1
Authority
EP
European Patent Office
Prior art keywords
piston
division plane
blind holes
ring
cooling chamber
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
EP88200507A
Other languages
German (de)
English (en)
Other versions
EP0285205A1 (fr
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.)
Kolbenschmidt AG
Original Assignee
Kolbenschmidt AG
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 Kolbenschmidt AG filed Critical Kolbenschmidt AG
Publication of EP0285205A1 publication Critical patent/EP0285205A1/fr
Application granted granted Critical
Publication of EP0285205B1 publication Critical patent/EP0285205B1/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 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to a piston with liquid cooling for internal combustion engines according to the preamble of claim 1.
  • two-part pistons consisting of a lower and upper part, which can be manufactured in different material combinations.
  • Cast or forged steel is a suitable material for the upper part, as is nodular cast iron with its strength values similar to those of steel.
  • the lower part can consist of a cast or forged aluminum piston alloy or also of gray cast iron. Both parts are preferably clamped together using expansion screws.
  • these pistons require cooling, preferably by means of a cooling oil.
  • signs of wear can be observed disadvantageously between the upper and lower parts of the pistons on the bearing surfaces of the support collars, which occur particularly in the outer region of the bearing surfaces and around the expansion screws.
  • This wear is caused by radial and axial movements of the bearing surfaces of the two piston components lying opposite one another in the connecting plane. These movements, which are caused by the carding effect caused by the deformation of the upper piston part as a result of temperature and gas pressure, not only produce wear, but also involve the risk of deformation of the lower piston part with subsequent crack formation and material abrasion.
  • Different solutions are already available to avoid these disadvantages, e.g. by DE-PS 27 58 378 and EP-PS 7661 provided.
  • the transition area between the inner surface of the piston crown and that at an angle of 35 to 55 ° is preferred according to a special feature of the piston designed according to the invention 45 °
  • the inner surface of the support collar (9) of the upper part (5), which inclines outwards and slopes towards the parting plane, is rounded with a radius of 30 to 60 mm.
  • FIG. 1 shows a detail of the piston designed according to the invention along the planes including the piston axis and the pin axis direction on the one hand and the piston axis and the direction perpendicular to the pin axis direction on the other hand in an axionometric representation.
  • FIG. 2 shows a half of a section through the upper part of the piston along the plane comprising the piston axis and the pin axis direction.
  • the piston is made of a gray cast iron, the piston pin (1) receiving the lower part (2) and a steel, the central cooling chamber (3) delimiting and the ring section (4) supporting upper part (5) with a flat combustion chamber bowl (6) , which are clamped together via expansion screws, not shown.
  • the lower part (2) is set back on both sides of the horizontal plane enclosing the pin axis direction and on the piston foot side up to the lower end like a sinew against the outer circumference of the lower part (2) and the hubs (7) of the pin eyes are displaced towards the piston axis.
  • the lower part (2) and the upper part (5) are supported against one another by means of annular support surfaces (10, 11) which are mounted on support collars (8, 9) in their plane of separation perpendicular to the piston axis.
  • the expansion screws are led through the support collars (8,9) and the contact surfaces (10,11).
  • the ring section (4) has two ring grooves (15, 16) for compression rings and one ring groove (17) for an oil ring.
  • the advantages achieved by the invention are, in particular, that by a comparatively significant reduction in the compression height and thus the overall height of the piston built significant weight reduction is achieved.
  • this weight reduction shows no adverse effects, since the arrangement of the blind holes achieves optimal cooling of the piston crown and ring section and, on the other hand, the necessary elasticity with good fatigue strength through the arrangement and design of the empty groove in the area of the parting plane and the associated circular and behind the Ring section extending section is reached.
  • By making the blind holes a comparatively large cooling surface is generated.

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)

Claims (5)

1. Piston à refroidissement par un liquide pour des moteurs à combustion interne, notamment pour des moteurs diesel à régime moyen, constitué d'une partie inférieure (2) recevant le tourillon du piston (1) et d'une partie supérieure (5), délimitant une chambre centrale de refroidissement (3) et comportant la zone des segments (4), qui s'appuient l'une contre l'autre par des surfaces d'appui (10, 11) de forme circulaire, qui sont prévues sur des collets d'appui (8, 9) concentriques et dont le plan de séparation est perpendiculaire à l'axe du piston, qui sont bloquées l'une avec l'autre par des vis passant à travers les collets d'appui et les surfaces d'appui, qui comportent dans la région de leur plan de séparation une gorge périphérique vide (13), ménagée à partir de la périphérie extérieure, et qui sont centrées l'une par rapport à l'autre par un rebord annulaire (12) ménagé sur la périphérie extérieure des surfaces de contact de la partie supérieure et s'appliquant sur le côté extérieur radial du collet d'appui de la surface d'appui de la partie inférieure, caractérisé en ce que la zone des segments (4) comporte deux segments de compression et une gorge de segment (15, 16, 17) recevant une bague de graissage, la hauteur de la zone de feu (21) représente de 6 à 10% et la hauteur de compression de 65 à 90% du diamètre du piston, de la gorge vide (13) est dérivée une gorge vide (14) s'étendant derrière la zone des segments, et des trous borgnes (22), s'étendant à partir de la chambre de refroidisborsement (3) parallèlement à l'axe du piston, ainsi que des trous borgnes (20), inclinée vers le haut par rapport au plan de séparation et s'étendant radialement vers l'extérieur, et qui s'étendent jusqu'à la partie derrière la zone de feu et jusqu'au bord de la tête du piston.
2. Piston suivant la revendication 1, caractérisé en ce que le diamètre des trous borgnes (20, 22) est compris entre 10 et 50 mm et de préférence entre 20 et 45 mm.
3. Piston suivant la revendication 1 ou 2, charac- térisé en ce que les trous borgnes (20) issus de la périphérie de la chambre de refroidissement (3) et montant de manière inclinée par rapport au plan de séparation, font un angle de 35 à 55° et de préférence de 45° avec le plan de séparation.
4. Piston suivant l'une des revendications 1 à 3, caractérisé en ce que les trous borgnes (22) qui s'étendent parallèlement à l'axe du piston sont disposés aux sommets d'hexagones réguliers.
5. Piston suivant l'une des revendications 1 à 4, caractérisé en ce que la partie de transition entre la surface intérieure de la tête du piston et la surface intérieure du collet d'appui (9) de la partie supérieure (5), inclinée vers le haut et vers l'extérieur par rapport au plan de séparation selon un angle de 35 à 55° et de préférence de 45°, est arrondie avec un rayon de 30 à 60 mm.
EP88200507A 1987-03-26 1988-03-18 Piston refroidi par liquide Expired - Lifetime EP0285205B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873709969 DE3709969A1 (de) 1987-03-26 1987-03-26 Kolben mit fluessigkeitskuehlung
DE3709969 1987-03-26

Publications (2)

Publication Number Publication Date
EP0285205A1 EP0285205A1 (fr) 1988-10-05
EP0285205B1 true EP0285205B1 (fr) 1990-10-03

Family

ID=6324040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200507A Expired - Lifetime EP0285205B1 (fr) 1987-03-26 1988-03-18 Piston refroidi par liquide

Country Status (3)

Country Link
EP (1) EP0285205B1 (fr)
DE (2) DE3709969A1 (fr)
FI (1) FI880884L (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3842321A1 (de) * 1988-12-16 1990-06-21 Kolbenschmidt Ag Kolben mit oelkuehlung fuer brennkraftmaschinen
DE4007992A1 (de) * 1989-03-20 1990-09-27 Avl Verbrennungskraft Messtech Mehrteiliger kolben fuer brennkraftmaschinen
DE4010062A1 (de) * 1990-03-29 1991-10-02 Mahle Gmbh Gekuehlter tauchkolben fuer verbrennungsmotoren mit voneinander getrenntem kolbenoberteil und kolbenschaft
DE4014703A1 (de) * 1990-05-08 1991-11-14 Mahle Gmbh Gekuehlter tauchkolben fuer verbrennungsmotoren mit voneinander getrenntem kolbenoberteil und kolbenschaft
DE4118400A1 (de) * 1990-06-29 1992-01-02 Kolbenschmidt Ag Gebauter, oelgekuehlter kolben fuer dieselmotoren
DE4120850A1 (de) * 1991-06-25 1993-01-07 Kolbenschmidt Ag Gebauter, oelgekuehlter kolben fuer dieselmotoren
JP2001349246A (ja) * 2000-06-07 2001-12-21 Honda Motor Co Ltd 内燃機関用ピストン
DE10046420B4 (de) 2000-09-20 2009-05-28 Mahle Gmbh Verfahren zur Herstellung einer Muldenrandverrundung
DE10244510A1 (de) * 2002-09-25 2004-04-08 Mahle Gmbh Einteiliger Kühlkanalkolben für einen Verbrennungsmotor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2530736C3 (de) * 1975-07-10 1984-06-28 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Thermisch belastetes Bauteil einer Brennkraftmaschine mit einer heißen Wand
US4286505A (en) * 1979-04-23 1981-09-01 Caterpillar Tractor Co. Oil cooled piston
FR2483521A1 (fr) * 1980-05-30 1981-12-04 Semt Piston de machine a pistons alternatifs, notamment de moteur a combustion interne
US4517930A (en) * 1982-09-28 1985-05-21 Kawasaki Jukogyo Kabushiki Kaisha Piston of combustion engine

Also Published As

Publication number Publication date
DE3709969A1 (de) 1988-10-06
DE3860721D1 (de) 1990-11-08
FI880884A7 (fi) 1988-09-27
FI880884L (fi) 1988-09-27
FI880884A0 (fi) 1988-02-25
EP0285205A1 (fr) 1988-10-05

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