DK161405B - Piston for an internal combustion engine - Google Patents

Piston for an internal combustion engine Download PDF

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Publication number
DK161405B
DK161405B DK232589A DK232589A DK161405B DK 161405 B DK161405 B DK 161405B DK 232589 A DK232589 A DK 232589A DK 232589 A DK232589 A DK 232589A DK 161405 B DK161405 B DK 161405B
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DK
Denmark
Prior art keywords
piston
bores
refrigerant
rib
bore
Prior art date
Application number
DK232589A
Other languages
Danish (da)
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DK161405C (en
DK232589A (en
DK232589D0 (en
Inventor
Erik Crone
Original Assignee
Man B & W Diesel 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
Application filed by Man B & W Diesel Gmbh filed Critical Man B & W Diesel Gmbh
Priority to DK232589A priority Critical patent/DK161405C/en
Publication of DK232589D0 publication Critical patent/DK232589D0/en
Priority to KR1019900006331A priority patent/KR0178034B1/en
Priority to SU904830030A priority patent/RU1808097C/en
Publication of DK232589A publication Critical patent/DK232589A/en
Publication of DK161405B publication Critical patent/DK161405B/en
Application granted granted Critical
Publication of DK161405C publication Critical patent/DK161405C/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

DK 161405 BDK 161405 B

iin

Opfindelsen vedrører et stempel til en forbrændingsmotor, navnlig en stor marinedieselmotor, af den art, der som kraftoverførende element mellem stempel og stempelstang har en ringformet ribbe ud i ét med stem-5 peltoppen, hvor der i et ringformet område mellem den fra stempeltoppen nedadvendende sidevæg af stemplet og ydersiden af den ringformede ribbe er flere i omkredsretningen jævnt fordelte boringer, der hver fra en mod stempeltoppen lukket ende strækker sig i det væsentlige 10 parallelt med stemplets akse og udmunder i et nedre ringformet kammer, og hvor der i ribben er i det væsentlige radiale kanaler, som via boringerne skaber strømningsforbindelse mellem et centralt hulrum inden for ribben og det nedre, ringformede kammer.The invention relates to a piston for an internal combustion engine, in particular a large marine diesel engine, of the kind which, as a power transfer element between piston and piston rod, has an annular rib integrally with the piston top, where in an annular region between the side wall downwards from the piston top of the plunger and the outside of the annular rib are several circumferentially spaced bores, each extending from an end closed to the plunger tip substantially parallel to the axis of the plunger and ending in a lower annular chamber, and in the rib there is substantial radial channels which, via the bores, create flow communication between a central cavity within the rib and the lower annular chamber.

15 Et sådant stempel kendes fra vesttysk patent skrift nr. 37 02 694, hvor kun nogle af boringerne har en tilhørende kanal, mens de resterende boringer ved plaskekøling tilføres kølemedium nedefra fra det ringformede kammer. Når stemplet bevæges op og ned i motor-20 cylinderen, pumpes stempelkølemediet fra det centrale hulrum via kanalerne og boringerne ned i det ringformede kammer, hvor det fordeler sig ud under samtlige boringer. Kanalerne har stort set samme diameter som boringerne og stempelkølemediet vil efter indstrømning 25 i boringen hovedsageligt bevæges på langs heraf.Such a piston is known from West German Patent Specification No. 37 02 694, where only some of the bores have an associated channel, while the remaining bores by splash cooling are supplied with cooling medium from below from the annular chamber. As the piston moves up and down the engine cylinder, the piston refrigerant is pumped from the central cavity via the ducts and bores into the annular chamber where it spreads out under all the bores. The ducts have substantially the same diameter as the bores and the piston refrigerant will move substantially longitudinally after inflow 25 into the bore.

Det er hensigten med opfindelsen at anvise et stempel med forbedret køling.It is an object of the invention to provide a plunger with improved cooling.

Med henblik herpå adskiller stemplet ifølge opfindelsen sig fra det kendte ved, at hver kanal har væ-30 sentlig mindre diameter end den tilhørende boring, og at kanalens akse hovedsageligt er tangent til en tænkt, med boringen koaksial cylinder, hvis diameter er 0,4 -0,6 gange boringens diameter.To this end, the piston according to the invention differs from the known in that each channel has a substantially smaller diameter than the associated bore and that the axis of the channel is mainly tangent to a conceived, with the bore coaxial cylinder, the diameter of which is 0.4 -0.6 times the diameter of the bore.

Som følge af kanalernes lille diameter i forhold 35 til boringerne trænger kølemediet fra det centrale hulrum ind i boringen som en koncentreret stråle med for- 2Due to the small diameter of the ducts in relation to the bores, the refrigerant from the central cavity penetrates into the bore as a concentrated beam of forcing.

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holdsvis stor strømningshastighed, og fordi kanalen er forsat i forhold til boringens akse strømmer kølemediet tangentialt ind i boringen og sættes i en kraftig rotation langs boringens vægge, hvorved der opnås en inten-5 siv varmeoverføring fra disse vægge til kølemediet og dermed en forbedret køling af stemplet.relatively large flow velocity, and because the duct is set relative to the axis of the bore, the refrigerant flows tangentially into the bore and is set in a vigorous rotation along the bore walls, thereby obtaining an intense heat transfer from these walls to the refrigerant, thereby improving cooling of the borehole. piston.

Stemplets køling kan yderligere forbedres gennem en ensartet afkøling af alle boringerne, ved at der i stemplet ifølge opfindelsen hensigtsmæssigt udmunder en 10 kanal i hver boring. Fordi kanalerne har lille diameter, vil stemplet bibeholde en tilstrækkelig mekanisk styrke, selv når den ringformede ribbe er gennembrudt af en kanal til hver boring.The cooling of the piston can be further improved by uniform cooling of all the bores by suitably opening a channel in each bore in the piston according to the invention. Because the channels are small in diameter, the piston will maintain a sufficient mechanical strength even when the annular rib is pierced by a channel for each bore.

Ifølge en foretrukket udførelsesform for opfin-15 delsen udmunder kanalerne i det centrale hulrum i en med stemplet koaksial, konisk flade, der danner overgang mellem stempeltoppens underside og ribbens inderside. Dette letter bearbejdningen af de radiale kanaler og medfører den yderligere fordel, at spændingskon-20 centrationerne i området omkring kanalernes udmunding ved overgangen mellem ribben og stempeltoppen er formindskede .According to a preferred embodiment of the invention, the channels in the central cavity open into a coaxial, tapered conical surface which forms a transition between the underside of the piston top and the inside of the rib. This facilitates machining of the radial channels and provides the additional advantage that the stress concentrations in the area around the channels' mouth at the transition between the rib and the piston top are reduced.

Med en hensigtsmæssig udførelsesform for stemplet ifølge opfindelsen, hvor kanalernes yderender alle 25 er forskudt til samme side for aksen af de tilhørende boringer, er der opnået en ensartet afkøling af stemplet, fordi kanalerne ligger jævnt fordelt i toppen af den ringformede ribbe.With an appropriate embodiment of the piston according to the invention, where the outer ends of the ducts are all displaced to the same side for the axis of the associated bores, uniform cooling of the piston is achieved, because the ducts are evenly distributed at the top of the annular rib.

Opfindelsen vil nu blive forklaret ved hjælp af 30 en udførelses form og med henvisning til tegningen, på hvilken fig. 1 er et længdesnit af et stempel ifølge opfindelsen vist monteret på toppen af en stempelstang, fig. 2 et aksialsnit gennem et stempel som i 35 fig. 1, men hvor overgangen mellem den ringformede ribbe og stempeltoppen er udført som en koniske flade, 3The invention will now be explained by way of an embodiment and with reference to the drawing, in which fig. 1 is a longitudinal section of a piston according to the invention shown mounted on top of a piston rod; FIG. 2 shows an axial section through a piston as in FIG. 1, but where the transition between the annular rib and the piston top is made as a tapered surface, 3

DK 161405 BDK 161405 B

fig. 3 et halvbillede visende stemplet set i retning af pilene ili-m i fig. 2.FIG. 3 is a half view showing the plunger seen in the direction of the arrows ili-m in FIG. 2nd

Det på tegningen viste stempel har en konkavt hvælvet stempeltop 1, som ved sin periferi er ud i ét 5 med en nedadvendende sidevæg 2, hvori der er bearbejdet fire riller 3 for stempelringe. En yderligere rille 4 i sidevæggens topland tæt under stemplets overside tjener til optagelse af et løfteværktøj ved indsætning og udtagning af stemplet i og fra den tilhø-10 rende motorcylinder.The piston shown in the drawing has a concave vaulted piston top 1, which at its periphery is integral to one 5 with a downward-facing side wall 2, in which four grooves 3 for piston rings are worked. An additional groove 4 in the top wall of the sidewall close to the top of the piston serves to receive a lifting tool by inserting and removing the piston in and from the associated engine cylinder.

Ud i ét med stempeltoppen 1 er en nedadvendende, ringformet ribbe 5, hvis middeldiameter i den viste udførelsesform er godt halvdelen af stempeldiameteren, og som langs sin nedadvendende endeflade 6 er 15 fastgjort til en flange 7 på en stempelstang 8 ved hjælp af et antal bolte 9. En separat, ringformet skørtdel 10 er boltet til undersiden af sidevæggen 2 og er langs sin indvendige omkreds tætnet i forhold til flangen 7 ved hjælp af en tætningsring 11 indlagt i 20 et rundtgående spor i flangen.In conjunction with the piston top 1 is a downwardly annular rib 5, whose average diameter in the illustrated embodiment is well over half of the piston diameter and which, along its downwardly facing end surface 6, is secured to a flange 7 on a piston rod 8 by means of a plurality of bolts 9. A separate annular skirt portion 10 is bolted to the underside of the side wall 2 and is sealed along its inner circumference with respect to the flange 7 by means of a sealing ring 11 inserted in a circumferential groove in the flange.

Bolten 9 med frigangshul og gevindhul samt frigangshullet i skørtdelen 10 og gevindhullet i stempelvæggen 2 er for illustrationens skyld vist drejet ind i snittets plan i de respektive figurer.The bolt 9 with release hole and threaded hole as well as the release hole in the skirt part 10 and the threaded hole in the piston wall 2 are shown for illustration purposes turned into the plane of the section in the respective figures.

25 Stemplet har i området mellem sidevæggen 2 og ydersiden af ribben 5 et antal, mod stempeltoppen 1 lukkede boringer 13, der i den bort fra stempeltoppen vendende ende udmunder i det nedre, ringformede kammer 17. Boringerne 13 er i den lukkede ende udformet med 30 en konkavt hvælvet top. Boringerne 13, der i dette tilfælde har med stemplets længdeakse parallelle akser, er beliggende med lige store mellemrum, således at der dannes mellemvægge 12, der virker som forstærkningsribber mellem sidevæggen 2 og den ringformede rib-35 be 5.The piston has in the region between the side wall 2 and the outside of the rib 5 a number of bores 13 closed to the piston top 1, which open at the end facing away from the piston top in the lower annular chamber 17. The bores 13 are formed at the closed end with 30 a concave vaulted top. The bores 13, which in this case have the longitudinal axes parallel to the piston, are spaced equally, so as to form intermediate walls 12 which act as reinforcing ribs between the side wall 2 and the annular rib 35.

Boringens akse kan, i en ikke vist udførelsesform, set i et radialplan danne en vinkel med stempletsThe axis of the bore, in an embodiment not shown, can form, in a radial plane, an angle with the piston

DK 161405 BDK 161405 B

4 længdeakse på 0-5°. Herved opnås, at køleeffekten kan fordeles på ønsket måde mellem stempeltoppen 1 og stemplets sidevæg 2. Lægges f.eks. boringernes akser således, at de skærer stemplets længdeakse under stem-5 peltoppen, opnås en kraftigere køling af området ved stempelringene og af stempeltoppen langs dennes periferi. Skærer boringernes akser derimod stemplets akse over stempeltoppen, kan der opnås en kraftigere køling af stempeltoppens hvælvede del over ribben 5.4 longitudinal axis of 0-5 °. Hereby it is achieved that the cooling effect can be distributed in the desired manner between the piston top 1 and the piston sidewall 2. the axes of the bores such that they intersect the longitudinal axis of the piston below the piston top, a stronger cooling of the area of the piston rings and of the piston top along its periphery is achieved. On the other hand, if the axis of the bores intersects the piston axis over the piston top, a stronger cooling of the vaulted part of the piston top can be obtained over the rib 5.

10 Hver boring 13 er forbundet med det centrale hulrum 15 ved hjælp af en retliniet kanal 14, der forløber fra indersiden af ribben 5, hvor denne går over i stempeltoppen 1 og til et punkt ved nær boringens lukkede ende 16, og kanalens akse er rettet 15 således, at den tangerer en tænkt, med boringen koak-sial cylinder, hvis diameter i det viste tilfælde er 0,5 gange boringens diameter.Each bore 13 is connected to the central cavity 15 by means of a rectilinear channel 14 extending from the inside of the rib 5 where it passes into the piston top 1 and to a point near the closed end 16 of the bore and the axis of the channel is directed. 15 such that it tangles a conical coaxial cylinder, the diameter of which in the case shown is 0.5 times the diameter of the bore.

I fig. 1 er overgangen mellem den ringformede ribbe 5 og stempel toppen 1 vist som en i snit set, 20 jævn runding, hvorimod den tilsvarende overgang i fig.In FIG. 1, the transition between the annular rib 5 and the piston top 1 is shown as a sectional, 20 rounded section, whereas the corresponding transition in FIG.

2 er udformet som en med stemplet koaksial, konisk flade. Ved sidstnævnte udførelsesform opnås, at spændingskoncentrationen omkring kanalerne 14 formindskes, og at bearbejdningen af kanalerne lettes.2 is formed as a coaxial, tapered conical surface. In the latter embodiment, it is achieved that the stress concentration around the ducts 14 is reduced and that the machining of the ducts is facilitated.

25 Stempelstangen 8 har en central boring, der ved hjælp af en rørformet indsats 20 er opdelt i en indvendig strømningspassage 21 og en udvendig, ringformet strømningspassage 19. Den indvendige passage 21 udmunder foroven i det centrale hulrum 15, medens 30 den udvendige passage 19 er lukket foroven af indsatsen 20. Det nedre, ringformede kammer 17, der er i strømningsforbindelse med alle boringer 13, står også i strømningsforbindelse med passagen 19 gennem en eller flere tværgående boringer 18 i flangen 7.The piston rod 8 has a central bore which, by means of a tubular insert 20, is divided into an internal flow passage 21 and an outer annular flow passage 19. The inner passage 21 opens at the top of the central cavity 15, while the outer passage 19 is closed at the top of the insert 20. The lower annular chamber 17, which is in flow communication with all bores 13, is also in flow communication with the passage 19 through one or more transverse bores 18 in the flange 7.

35 Under motorens drift tilføres stempelkølemediet, fortrinsvis køleolie, ved hjælp af en pumpe til passa-35 During the operation of the engine, the piston refrigerant, preferably cooling oil, is supplied by means of a pump for passage.

Claims (4)

5 DK 161405 B gen 21 i stempelstangen 8, og kølemediet returnerer gennem passagen 19. Når stemplet bevæger sig opad med tiltagende acceleration, presses eventuelt kølemedium i stemplet tilbage til stempelstangen, men efterhånden 5 som accelerationen aftager, når stemplet nærmer sig topdødpunktet i sin bevægelse, strømmer kølemediet op gennem passagerne 21 og 19 og videre op i henholdsvis det centrale hulrum 15 og boringerne 13, i sidstnævnte tilfælde via kanalerne 18 og det nedre, ring-10 formede kammer 17. Undersiden af stempeltoppen afkøles således i denne fase af stemplets bevægelse ved plaske-køling. Under stemplets videre bevægelse presses stem-pelkølemediet ind i det centrale hulrum 15 og strømmer derfra gennem kanalerne 14 ud i boringerne, og på 15 grund af den tangentiale indstrømning i boringerne sættes kølemediet i disse i en kraftigt roterende bevægelse. Rotationsbevægelsens impulsmomentvektor er i det væsentlige parallel med stemplets bevægelsesretning, og rotationen af kølemediet forstyrres derfor ikke af 20 stemplets bevægelse. Når stemplet nærmer sig bunddød-punktet, tvinges olien ud af hulrummet 15 og boringerne 13 tilbage i den hule stempelstang, hvorefter forløbet gentages som ovenfor beskrevet. 25 PATENTKRAV5 DK 161405 B gene 21 in the piston rod 8, and the refrigerant returns through the passage 19. As the piston moves upward with increasing acceleration, any refrigerant in the piston is pressed back to the piston rod, but as the acceleration decreases as the piston approaches the top dead center in its movement. , the refrigerant flows up through the passages 21 and 19 and further up into the central cavity 15 and the bores 13, respectively, in the latter case via the channels 18 and the lower annular chamber 17. The underside of the piston top is thus cooled during this phase of the piston's movement. by splash cooling. During the further movement of the piston, the piston refrigerant is pressed into the central cavity 15 and flows therefrom through the channels 14 into the bores, and due to the tangential inflow into the bores, the refrigerant is placed therein in a vigorously rotating motion. The pulse momentum vector of the rotary motion is substantially parallel to the direction of movement of the piston, and therefore the rotation of the refrigerant is not disturbed by the motion of the piston. As the piston approaches the bottom dead point, the oil is forced out of the cavity 15 and the bores 13 back into the hollow piston rod, after which the process is repeated as described above. 25 PATENT REQUIREMENTS 1. Stempel til en forbrændingsmotor, navnlig en stor marinedieselmotor, og af den art, der som kraftoverførende element mellem stempel og stempelstang (8) har en ringformet ribbe (5) ud i ét med stempeltoppen, 30 hvor der i et ringformet område mellem den fra stempeltoppen (1) nedadvendende sidevæg (2) af stemplet og ydersiden af den ringformede ribbe (5) er flere i omkredsretningen jævnt fordelte boringer, der hver fra en mod stempel toppen lukket ende strækker sig i det væ-35 sentlige parallelt med stemplets akse og udmunder i et nedre ringformet kammer (17), og hvor der i ribben (5) DK 161405 B 6 er i det væsentlige radiale kanaler (14), som via boringerne skaber strømningsforbindelse mellem et centralt hulrum (15) inden for ribben (5) og det nedre, ringformede kammer, kendetegnet ved, at hver 5 kanal har væsentlig mindre diameter end den tilhørende ; boring, og at kanalens akse hovedsageligt er tangent til en tænkt, med boringen koaksial cylinder, hvis diameter er 0,4 - 0,6 gange boringens (13) diameter.1. Piston for an internal combustion engine, in particular a large marine diesel engine, and of the kind which, as a power transmitting element between piston and piston rod (8), has an annular rib (5) integral with the piston top, wherein in an annular region between it from the piston top (1) downward sidewall (2) of the piston and the outside of the annular rib (5) are several bores evenly spaced in circumferential direction, each extending from an end closed against the piston substantially parallel to the axis of the piston and ending in a lower annular chamber (17) and wherein in the rib (5) there are substantially radial channels (14) which, through the bores, create flow communication between a central cavity (15) within the rib (5). ) and the lower annular chamber, characterized in that each channel is substantially smaller in diameter than the corresponding one; bore, and that the axis of the channel is essentially tangent to a conceivable, with the bore coaxial cylinder, the diameter of which is 0.4 - 0.6 times the diameter of the bore (13). 2. Stempel ifølge krav l,kendetegnet 10 ved, at der udmunder en kanal i hver boring.Piston according to claim 1, characterized in that a channel is opened in each bore. 3. Stempel ifølge krav 1 eller 2, kendetegnet ved, at kanalerne udmunder i det centrale hulrum (15) i en med stemplet koaksial konisk flade, der danner overgang mellem stempeltoppens inderside og 15 ribbens (5) inderside.Piston according to claim 1 or 2, characterized in that the channels open into the central cavity (15) in a coaxial conical surface with a stamped surface, which forms a transition between the inside of the piston top and the inside of the rib (5). 4. Stempel ifølge et af kravene 1-3, k ende-tegnet ved, at kanalernes (14) yderender alle er forskudt til samme side for aksen af de tilhørende boringer (13).Piston according to one of claims 1-3, characterized in that the outer ends of the ducts (14) are all displaced to the same side for the axis of the associated bores (13).
DK232589A 1989-05-12 1989-05-12 STAMP FOR A COMBUSTION ENGINE DK161405C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DK232589A DK161405C (en) 1989-05-12 1989-05-12 STAMP FOR A COMBUSTION ENGINE
KR1019900006331A KR0178034B1 (en) 1989-05-12 1990-05-04 Piston of internal combustion engine
SU904830030A RU1808097C (en) 1989-05-12 1990-05-11 Piston of internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK232589A DK161405C (en) 1989-05-12 1989-05-12 STAMP FOR A COMBUSTION ENGINE
DK232589 1989-05-12

Publications (4)

Publication Number Publication Date
DK232589D0 DK232589D0 (en) 1989-05-12
DK232589A DK232589A (en) 1990-11-13
DK161405B true DK161405B (en) 1991-07-01
DK161405C DK161405C (en) 1991-12-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
DK232589A DK161405C (en) 1989-05-12 1989-05-12 STAMP FOR A COMBUSTION ENGINE

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KR (1) KR0178034B1 (en)
DK (1) DK161405C (en)
RU (1) RU1808097C (en)

Also Published As

Publication number Publication date
KR0178034B1 (en) 1999-04-15
DK161405C (en) 1991-12-09
RU1808097C (en) 1993-04-07
DK232589A (en) 1990-11-13
DK232589D0 (en) 1989-05-12
KR900018573A (en) 1990-12-21

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