EP0189767B1 - Piston à plusieurs parties, refroidi par de l'huile, pour moteurs à combustion interne à piston alternatif - Google Patents

Piston à plusieurs parties, refroidi par de l'huile, pour moteurs à combustion interne à piston alternatif Download PDF

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Publication number
EP0189767B1
EP0189767B1 EP86100309A EP86100309A EP0189767B1 EP 0189767 B1 EP0189767 B1 EP 0189767B1 EP 86100309 A EP86100309 A EP 86100309A EP 86100309 A EP86100309 A EP 86100309A EP 0189767 B1 EP0189767 B1 EP 0189767B1
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EP
European Patent Office
Prior art keywords
piston
oil
wall
piston part
dome
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
EP86100309A
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German (de)
English (en)
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EP0189767A3 (en
EP0189767A2 (fr
Inventor
Horst Lindner
Jordan Gentscheff
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.)
MAN B&W Diesel GmbH
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MAN B&W Diesel GmbH
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Filing date
Publication date
Application filed by MAN B&W Diesel GmbH filed Critical MAN B&W Diesel GmbH
Publication of EP0189767A2 publication Critical patent/EP0189767A2/fr
Publication of EP0189767A3 publication Critical patent/EP0189767A3/de
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Publication of EP0189767B1 publication Critical patent/EP0189767B1/fr
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 
    • F02F3/16—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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins
    • 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
    • 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 an oil-cooled, multi-part plunger for reciprocating internal combustion engines with features as specified in the preamble of claim 1.
  • Such an oil-cooled plunger is known from DE-A-1 526 598.
  • the lower piston part is made of aluminum, while the upper piston part is made of a steel material.
  • Such a piston is particularly unsuitable for very high ignition pressures because of the aluminum lower piston part, because the deformation of the lower piston part becomes very large under the acting ignition pressures, which could cause piston seizures.
  • This disadvantage could be remedied by producing the lower piston part with a corresponding ovality and crowning so that it can absorb the deformation resulting from the action of the ignition pressures.
  • the piston to be created should be designed to provide more favorable cooling oil guidance for the best effect of the cooling oil to be passed through, in particular with a view to reducing the amount of oil to be carried out; furthermore, the piston to be created, while avoiding a large number of lubricating oil scraper rings at a given low lubricating oil consumption, should enable such favorable lubricating oil regulation that the oil present is in any case so distributable that in places of the piston circumferential area where lubricating oil is absolutely necessary, e.g. B. on the cylinder surface in the area of the pressure and counter-pressure side of the piston, lubricated more intensely than at other circumferential locations of the piston.
  • the upper piston part is made of nodular cast iron or steel material
  • the lower part of the piston is made of gray cast iron or nodular cast iron
  • the material can also be used to take account of extremely high loads that will occur later in operation.
  • the ignition pressures acting on the plunger during operation are also taken into account by the dome-like design of the piston-bolt carrying chair according to the invention, the special support of the upper piston part on the lower piston part and the likewise dome-like limitation of the internal cooling space.
  • the cooling oil guide according to the invention in the piston not only achieves a very favorable cooling effect; by appropriate distribution of the transfer bores between the inner and outer cooling space, in particular by different distances between them with a corresponding clustering and size and inclination dimensioning, the uneven temperature distribution acting in the upper piston part can be influenced so favorably that uneven deformations of the piston crown in the radial direction can be avoided.
  • the latter in conjunction with the support of the piston upper part according to the invention in the region of its bending-neutral zone, contributes to the fact that its outer wall remains largely cylindrical even under the action of the thermal and mechanical load.
  • the inventive design of the lower edge of the lower piston part also advantageously achieves that effect that there is always sufficient lubricating oil on the cylinder wall on the pressure side of the plunger and its counter-pressure side, while in the remaining circumferential regions of the plunger, in which no such heavy lubrication is required is that the lubricating oil is largely stripped off the cylinder running surface when the plunger moves downward.
  • the oil-cooled plunger shown in the drawing consists of a piston lower part, generally designated 1, and an upper piston section, generally designated 2.
  • the one-piece upper piston part 2 comprises a piston crown 3 and an outer wall 4 with a cylindrical outer surface 5 and a plurality of ring grooves, into which piston rings 6 are inserted.
  • the outer wall 4 of the piston upper part 2 is composed of a wall section 7 of large cross-section adjoining the piston crown 3 and a wall section 9 of smaller diameter adjoining its lower edge 8.
  • an undercut 10 with a circular-cylindrical centering surface 11 and a contact surface 12 perpendicular to the piston axis is formed in the cross-sectional wall part 7 of the outer wall 4.
  • the upper piston part 2 is supported on the outer end face 13 of a support collar 14, which is formed on the upper side of a piston bolt support chair designated by 15 and forming part of the lower piston part 1.
  • the piston upper part 2 in relation to the piston lower part 1, is centered on the circular cylindrical centering surface 11 on a circular cylindrical centering surface 16 formed thereon on the supporting collar 4.
  • an axially projecting support collar 17 is formed on the inside of the piston crown 3 and has a contact surface 18 at the bottom which is transverse to the piston longitudinal axis. With this contact surface 18, this upper piston part 2 is supported on the end face 13 of the support collar 14.
  • this upper piston part 2 is supported via the lower edge 19 of its outer wall 4 on the upper edge 20 of the outer wall of the lower piston part 1, generally designated 21.
  • This upper piston part 2 is centered here by a circular cylindrical outer surface 22, which is arranged coaxially to the longitudinal axis of the piston, of a centering collar 23 projecting above the upper edge 20 and against which the outer wall 4 of this upper piston part 2 lies with its inner cylindrical surface 24 in the lower region.
  • the upper piston part 2 is fastened to the lower piston part 1 generally by means of a plurality of clamping screws 25, which are only indicated by dash-dotted lines in the drawing.
  • a piston pin is designated, which is anchored in a bearing bore 27 which penetrates the piston piston support frame 15 in the lower piston part 1.
  • a bearing sleeve 28 sits on this piston pin 26, the position of which is fixed between fixing surfaces 29, 30 and 31, 32 parallel to the longitudinal axis of the piston.
  • the plunger is articulated via the piston pin 26 and the bearing sleeve 28 seated thereon to a connecting rod 33 connected to the crankshaft (not shown) of a reciprocating piston internal combustion engine in the region of the connecting rod head 34, this connection being produced via a receiving bore 35 which penetrates the connecting rod head 34 transversely and encompasses the bearing sleeve 28 is.
  • a projection is designated, which is arranged on the upper side 37 of the piston bolt support chair 15 and either - as shown in Figures 1 to 3 - formed in one piece with the latter or - as shown in Figure 4 - only in one piece with the lower part Piston-bolt support chair 15 can be formed, in which case the upper section is realized by a tubular attachment piece 38.
  • This projection 36, 38 like the piston-piston carrying chair 15, is penetrated overall by a central cooling-oil passage hole 39 arranged coaxially to the piston longitudinal axis.
  • the projection 36, 38 generally protrudes into the area of the piston upper part 2 and, with its upper edge 40, limits the cooling oil fill level of an inner cooling space, which is designated overall by 41.
  • the latter is delimited in its lower region by the inner surface 42 of the support collar 14, furthermore the upper side 37 of the piston bolt support chair 15 and the outer surface 43 of the projection 36, 38 and in its upper region by a recess in the upper piston part 2.
  • This inner cooling space 41 is connected via inclined transfer holes 44 formed in the upper piston part 2 to an outer cooling space, designated overall by 45, which extends both in the upper piston part 2 and in the lower piston part 1, there around the supporting collar 14.
  • the upper piston part 2 is made in one piece from nodular cast iron or steel material, while the lower piston part 1 is also made in one piece from gray cast iron or nodular cast iron.
  • the plunger is designed for a special type of shaker cooling; the cooling oil is supplied from the connecting rod 33 through a feed bore 46, an annular channel 47 1 1 m, the bearing sleeve 28 and a spray bore 48 in the connecting rod head 34 through the cooling oil passage hole 39 into the inner cooling space 41. From there, the cooling oil, as a result of the piston movements during operation, passes through the transfer bores 44 into the outer cooling chamber 45 and from there via outlet openings 49 arranged in its lower region back into the engine room of the reciprocating piston internal combustion engine.
  • the inner cooling space 41 is provided by a dome-like cavity, which is radially on the outside by a correspondingly curved shape of the inner wall 42 of the support collar 14, and then by a correspondingly continuously curved shape in the case of the plunger of FIGS. 1 to 3 of the inner surface 50 of the cross-sectional wall part 7 the outer wall 4 of the piston upper part 2 or, in the case of the plunger of FIG. 4, the inner surface 51 of the support collar 17 and then subsequently formed by a correspondingly continued curvature of the inner surface 52 of the piston crown 3.
  • an elevation 53 is provided on the inner surface 52 of the piston crown 3, which contributes to a favorable introduction and distribution of the cooling oil in the inner cooling space 41.
  • blind holes 54 which are distributed in the periphery and are slightly obliquely with respect to the longitudinal axis of the piston, from the lower edge 8 of the cross-sectional wall part 7 of the outer wall 4, and on the other hand through an annular space 55 is formed, into which the blind holes 54 open.
  • a transition bore 44 opens into each blind hole 54, which branches off from the inner cooling space 41 in the region of the inner surface 50 of the wall section 7 with a large cross-section and opens obliquely upwards into the associated blind hole 54 near its closed end.
  • the space 55 is delimited radially on the outside by the inner surface 56 of the lower-walled lower wall part 9 of the outer wall 4 of the piston upper part 2 and radially on the inside by the outer surface 57 of the support collar 14 and at the top by the lower edge 8 of the cross-sectional wall part 7 of the outer wall 4 of the upper piston part 2.
  • the outer cooling space 45 continues downward within the lower piston part 1 through an annular space 58 which extends down to the piston-piston carrying chair 15.
  • the outer cooling space 45 in the area of the piston upper part 2 is formed by an annular upper cooling space part 59, which is delimited on the outside by the inner surface 24 of the outer wall 4 of the upper piston part 2, on the inside by the outer surface 60 of the support collar 17 and downwards a lower cooling chamber part 61 present in the piston lower part 1 is open, which, as in the exemplary embodiment according to FIGS. 1 to 3, extends down to the piston-piston carrying chair 15.
  • the piston pin support chair 15 is generally dome-like, like the boundary wall of the inner cooling space 41, that is to say designed in the manner of a hollow spherical section-shaped dome, in such a way that it surrounds the connecting rod head 34, which has an essentially round outer contour 62 within the lower piston part 1, with a small clearance.
  • this dome-shaped piston pin supporting chair 15 has bearing eyes 63 and 64 on both sides of the connecting rod head 34, as can be seen in FIG. 2, which are penetrated by the bearing bore 27 and serve to receive the piston pin ends projecting on both sides of the connecting rod head 34.
  • the outer wall 21 of the piston lower part 1 is interrupted in each case by an opening 65 or 66 through which the piston pin 26 is assembled.
  • the dome-shaped piston pin support chair 15 preferably has a wall thickness that is essentially the same everywhere, so that the part of the outer cooling space 45 present in the piston lower part 1 partially extends down to the level of the piston pin 26, as can be seen in FIG. 1.
  • a plurality of stiffening beads 67 are arranged on the top 37 of the dome-like piston pin support chair 15 and are distributed around the circumference.
  • the annular support collar 14 has at its upper end such a diameter that it supports the piston upper part 2 resting on its annular contact surface 13 in its bending-neutral zone.
  • those peripheral areas of the lower edge 68 of the piston lower part 1 are generally formed as oil-scraper edges 69 in the area axially below the two openings 65 and 66 in the outer wall 21, as can be seen in FIG. 2, while the remaining areas in the area of the pressure and the circumferential regions of the lower edge 68 of the lower piston part 1 lying on the counterpressure side of the plunger are chamfered or rounded as oil delivery surfaces 70.
  • the radius of the outer boundary surface 72 adjacent to the outer contour 62 of the connecting rod head 34 is preferably - as can be seen in FIG. 1 - somewhat larger than the radius of the outer contour 62 of the connecting rod head 34.
  • the entry area of the cooling oil passage hole 39 is conical to the connecting rod head 34 expanded. This ensures a perfect transfer of the cooling oil leaving the spray bore 48 in the connecting rod head 26 into the cooling oil passage hole 39 and a favorable transfer of the cooling oil through the latter into the inner cooling space 41.
  • the outer wall 4 on the upper piston part 2 and the outer wall 21 on the lower piston part 1 in the plunger piston according to FIGS. 1 to 3 are preferably matched in their height so that after connecting the upper piston part 2 and lower piston part 1 between the flat lower edge 73 of the outer wall 4 of the upper piston part 2 and the flat upper edge 74 of the outer wall 21 of the lower piston part 1, an annular gap 75 remains free, through which oil from the cylinder wall, which is stripped off the upper piston part 2 and from the cylinder wall, can enter the outer cooling space 45.
  • the dome-shaped piston-piston carrying chair 15 is - as can be seen from FIG. 1 - connected to the outer wall 21 of the piston lower part 1 approximately at the level of a piston transverse plane containing the piston pin longitudinal axis.
  • the features according to the invention and in particular their combinatorial combination in a plunger ensure that the plunger can function properly even at the highest ignition pressures of the order of 180 bar, for example.
  • the piston upper part 2 in a bending-neutral zone in connection with the dome-like design of the piston-bolt carrying chair 15 and the dome-like limitation of the inner cooling space 41, it is ensured that the ignition pressures acting on the plunger in machine operation in the best possible way via the support collar 14 and the piston pin 76 can be introduced into the connecting rod 33 so that the cylindricity and coaxiality of the outer wall 4 of the upper piston part 2 and the outer wall 21 of the lower piston part 1 are largely preserved.
  • the type of cooling oil guide according to the invention in particular in the piston upper part 2, also ensures intensive cooling of the same. Negative influences from the temperatures prevailing in machine operation on the shape of the piston upper part 2 can therefore also be largely avoided by the type of coolant guidance in the piston upper part.

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  • 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 (9)

1. Piston plongeur refroidi par huile, qui se compose d'une partie inférieure monobloc (1) et d'une partie supérieure monobloc (2), réalisée en un matériau aciéré et comportant un fond de piston (3) et une partie extérieure (4) pourvue de gorges dans lesquelles sont logés des segments de piston (6), le piston étant articulé sur une bielle (33), reliée au vilebrequin d'un moteur à combustion interne à pistons alternatifs, par l'intermediaire d'un pivot (26), qui est engagé par ses extrémités dans des oeillets d'appui (63, 64) prévus dans un support de pivot (15) de la partie inférieure (1) du piston, de façon à passer dans un alésage de palier (27) traversant le support, la partie supérieure (2) du piston est soutenue, au moyen d'une surface d'appui (12) se trouvant sur le côté frontal d'un seul collet d'appui (7, 17), décalé par rapport au fond (3) du piston et séparé de la paroi extérieure (4) par un volume extérieur de refroidissement (45) du piston, contre la surface frontale (13) d'un collet.porteur (14) de forme annulaire qui est placé en haut sur le support de pivot de piston (15) et étant centrée, par l'intermédiaire d'une surface de centrage de forme cylindrique circulaire (11) par rapport à la partie inférieure (1) du piston au moyen d'une surface de centrage (16) prévue en cet endroit et étant reliée à celle-ci au moyen de plusieurs vis de serrage (25), tandis qu'il est en outre prévu sur le côté supérieur du support de pivot de piston (15) une saillie (36, 38) traversée comme ce dernier par un trou (39) de passage d'huile de refroidissement, disposé de façon centrée et coaxialement par rapport à l'axe longitudinal du piston, ladite saillie pénétrant dans la zone de la partie supérieure de piston (2) et délimitant par son bord supérieur (40) le niveau de remplissage en huile de refroidissement d'un volume intérieur de refroidissement (41), qui est délimité comme une cavité en forme de dôme dans sa zone inférieure par la surface intérieure incurvée (42) du collet porteur (14), le côté supérieur (37) du support de pivot de piston (15) et la surface extérieure (43) de la saillie (36, 38 ), ainsi que dans sa zone supérieure par une surface intérieure incurvée (50, 51) de la partie supérieure de piston (2) et par une zone incurvée, placée à la suite de ladite surface, de la surface intérieure (52) du fond de piston (3), et qui est en outre relié, par l'intermédiaire de trous inclinés de communication (44) ménagés dans la partie supérieure de piston (2), avec le volume extérieur de refroidissement (45), qui s'étend d'une part dans la partie supérieure de piston (2) et d'autre part dans la partie inférieure de piston (1), en entourant dans celle-ci le collet porteur (14), caractérisé en ce que:
- la partie supérieure de piston (2) est réalisée en fonte à graphite sphéroïdal ou en un matériau aciéré et la partie inférieure de piston (1) est réalisée en fonte grise ou en fonte à graphite sphéroïdal,
- le piston plongeur est conçu pour un système de refroidissement de type Shaker, comportant une arrivée d'huile de refroidissement dans la bielle (33) de façon que l'huile pénètre par le trou de passage d'huile de refroidissement (39) dans le volume intérieur de refroidissement (41), l'huile parvenant ensuite par l'intermédiaire des trous de communication (44) dans le volume extérieur de refroidissement (45) et revenant ensuite par l'intermédiaire d'orifices de sortie (49) dans le carter du moteur,
- le support de pivot de piston (15) prévu dans la partie inférieure (1) du piston est profilé également en forme de dôme à peu près à la manière d'une coupole en forme de partie de sphère creuse et il entoure à une légère distance à l'intérieur de la partie inférieure (1) du piston une tête de bielle (34) ayant un contour extérieur (62) sensiblement circulaire,
- le collet porteur (14) de forme annulaire qui est disposé en haut sur le support de pivot de piston (15) en forme de dôme soutient la partie supérieure (2) du piston, s'appuyant contre sa surface frontale (13) par sa surface d'appui (12, 18) de forme annulaire, dans sa zone neutre en flexion,
- la saillie centrale (36) et le collet porteur de forme annulaire (14), qui sont tous deux formés sur le côté supérieur du support de pivot de piston (15) en forme de dôme, ont chacun une hauteur correspondant à peu près au diamètre du pivot de piston (26),
- chacune des zones périphériques du bord inférieur (68) de la partie inférieure (1) du piston, qui sont situées dans une zone placée axialement en dessous d'évidements (65, 66) de la paroi extérieure (21) permettant le montage du pivot de piston (26), sont réalisées avec des arêtes vives comme des arêtes de raclage d'huile (69) tandis que les zones périphériques restantes du bord inférieur (68) de la partie inférieure (1) du piston, qui sont situées du côté en pression et du côté en contre-pression du piston plongeur, sont biseautées ou arrondies comme des surfaces de refoulement d'huile (70).
2. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce que le rayon de la surface extérieure (72), adjacente au contour extérieur (62) de la tête de bielle (34), du support de pivot de piston (15) en forme de dôme est un peu plus grand que le rayon du contour extérieur (62) de la tête de bielle (34).
3. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce que le support de pivot de piston (15) en forme de dôme est relié, à peu près à la hauteur d'un plan transversal du piston passant par l'axe longitudinal du pivot de piston, avec la paroi extérieure (21) de la partie inférieure (1) du piston.
4. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce que le support de pivot de piston (15) en forme de dôme a une épaisseur de paroi qui est dans l'essentiel la même partout.
5. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce qu'il est prévu plusieurs bourrelets de renforcement (67) qui s'étendent entre la surface extérieure (43) de la saillie centrale (36), la surface intérieure (42) du collet porteur (14) et le côté supérieur (37) du support de pivot de piston (15) en forme de dôme.
6. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce que la zone d'entrée du trou (39) de passage d'huile de refroidissement, traversant la saillie centrale (36) et la paroi du support de pivot de piston (15) en forme de dôme, est élargie avec un profil conique en direction de la tête de bielle (26).
7. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce que le volume extérieur de refroidissement (45) est constitué dans la zone de la partie supérieure (2) du piston d'une part par plusieurs trous borgnes (54) répartis sur la périphérie, s'étendant légèrement en oblique par rapport à l'axe longitudinal du piston et formés à partir du bas dans une portion (7), renforcée en section droite, de la paroi extérieure (4) de la partie supérieure (2) du piston et dans chacun desquels débouche un des trous de communication (44), et d'autre part par un volume (55) de forme annulaire dans lequel débouchent les trous borgnes (54) et qui est délimité extérieurement par la surface intérieure (56) d'une partie inférieure (9), de section affaiblie, de la paroi extérieure (4) et intérieurement par la paroi extérieure (57) du collet porteur (14), et en outre en haut par le bord inférieur (8) de la partie de paroi (7) de section renforcée.
8. Piston plongeur refroidi par huile selon les revendications 1 et 7, caractérisé en ce que, après liaison de la partie supérieure (2) avec la partie inférieure (1) du piston, il subsiste entre le bord inférieur plan (73) de la paroi extérieure (4) de la partie supérieure de piston (2) et le bord supérieur plan (74) de la paroi extérieure (21) de la partie inférieure de piston (1), un intervalle annulaire (75) par lequel de l'huile, qui a été raclée à partir de la paroi supérieure par le segment de piston (6) qui est placé complètement en bas sur la partie supérieure de piston (2), peut pénétrer dans le volume extérieur de refroidissement (45).
9. Piston plongeur refroidi par huile selon la revendication 1, caractérisé en ce que le volume extérieur de refroidissement (45) est constitué, dans une zone de la partie supérieure (2) du piston, par une portion supérieure de volume de refroidissement (59) de forme annulaire, qui est délimitée extérieurement par la surface intérieure (24) de la paroi extérieure (4) de la partie supérieure de piston (2), et intérieurement par la surface extérieure (60) d'un collet d'appui (17) de forme annulaire, comportant en bas la surface d'appui (18), et qui est ouvert vers le bas en direction d'une portion inférieure de volume de refroidissement (61) existant dans la partie inférieure (1) du piston, et en ce que dans ce cas la partie supérieure (2) du piston est soutenue non seulement par l'intermédiaire de la surface d'appui (13), existant en bas sur le collet d'appui (17), sur le collet porteur (14) mais également en outre, par l'intermédiaire du bord inférieur (19) de la paroi extérieure (4) de la partie supérieure de piston (2), contre le bord supérieur (20) de la paroi extérieure (21) de la partie inférieure de piston (1) et est centrée dans cette zone, au moyen d'une surface de centrage (22) de forme cylindrique circulaire, par rapport à cette dernière.
EP86100309A 1985-01-26 1986-01-11 Piston à plusieurs parties, refroidi par de l'huile, pour moteurs à combustion interne à piston alternatif Expired EP0189767B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502644 DE3502644A1 (de) 1985-01-26 1985-01-26 Oelgekuehlter, mehrteiliger tauchkolben fuer hubkolbenbrennkraftmaschinen
DE3502644 1985-01-26

Publications (3)

Publication Number Publication Date
EP0189767A2 EP0189767A2 (fr) 1986-08-06
EP0189767A3 EP0189767A3 (en) 1987-04-01
EP0189767B1 true EP0189767B1 (fr) 1988-08-10

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ID=6260869

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Application Number Title Priority Date Filing Date
EP86100309A Expired EP0189767B1 (fr) 1985-01-26 1986-01-11 Piston à plusieurs parties, refroidi par de l'huile, pour moteurs à combustion interne à piston alternatif

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Country Link
EP (1) EP0189767B1 (fr)
JP (1) JP2540493B2 (fr)
DE (2) DE3502644A1 (fr)
FI (1) FI79888B (fr)
NO (1) NO163153C (fr)

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EP1222364B2 (fr) † 1999-10-08 2018-03-28 Federal-Mogul Corporation Pistons a deux evidements

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DE102005048981B4 (de) 2005-10-13 2010-04-29 Man B & W Diesel A/S Kolben für einen Kreuzkopfmotor
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US9127618B2 (en) 2012-09-27 2015-09-08 Federal-Mogul Corporation Reduced compression height piston and piston assembly therewith and methods of construction thereof
DE102013002232B4 (de) * 2013-02-11 2022-11-17 Man Energy Solutions Se Kolben einer Brennkraftmaschine
US10184422B2 (en) 2014-12-30 2019-01-22 Tenneco Inc. Reduced compression height dual gallery piston, piston assembly therewith and methods of construction thereof
US10294887B2 (en) 2015-11-18 2019-05-21 Tenneco Inc. Piston providing for reduced heat loss using cooling media
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DE102017201137A1 (de) 2017-01-25 2018-07-26 Volkswagen Aktiengesellschaft Kolben für einen Verbrennungsmotor
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1222364B2 (fr) † 1999-10-08 2018-03-28 Federal-Mogul Corporation Pistons a deux evidements

Also Published As

Publication number Publication date
DE3660506D1 (en) 1988-09-15
FI79888B (fi) 1989-11-30
JPS61175256A (ja) 1986-08-06
EP0189767A3 (en) 1987-04-01
NO163153B (no) 1990-01-02
NO860264L (no) 1986-07-28
JP2540493B2 (ja) 1996-10-02
FI854870A0 (fi) 1985-12-10
NO163153C (no) 1990-04-11
DE3502644A1 (de) 1986-07-31
EP0189767A2 (fr) 1986-08-06
FI854870A (fi) 1986-07-27

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