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EP3555451B1 - Canal de refroidissement comprenant une digue et une trémie - Google Patents

Canal de refroidissement comprenant une digue et une trémie Download PDF

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Publication number
EP3555451B1
EP3555451B1 EP17822262.6A EP17822262A EP3555451B1 EP 3555451 B1 EP3555451 B1 EP 3555451B1 EP 17822262 A EP17822262 A EP 17822262A EP 3555451 B1 EP3555451 B1 EP 3555451B1
Authority
EP
European Patent Office
Prior art keywords
cooling channel
piston
dam
shaped
inlet opening
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.)
Active
Application number
EP17822262.6A
Other languages
German (de)
English (en)
Other versions
EP3555451A1 (fr
Inventor
Gerhard Luz
Ingo Roth
Eberhard Weiss
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP3555451A1 publication Critical patent/EP3555451A1/fr
Application granted granted Critical
Publication of EP3555451B1 publication Critical patent/EP3555451B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • B21K1/185—Making machine elements pistons or plungers with cooling channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/10—Cooling by flow of coolant through pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • 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

Definitions

  • the invention relates to a piston, consisting of an upper part and a lower part, which are joined together, with a cooling channel, preferably an annular cooling channel, wherein at least one inlet opening is provided for the supply of cooling oil and at least one outlet opening is provided for the discharge of the cooling oil, according to the features of the preamble of patent claim 1.
  • the above-mentioned inlet or outlet opening extends from an inner area of the piston in the direction of the cooling channel and passes through the lower wall, in particular the lower apex of the cooling channel.
  • the opening is located at the lowest point of the cooling channel, so that cooling oil always flows out of the cooling channel, at least when the piston is at a standstill, and cannot be stored there.
  • a piston for an internal combustion engine with an upper piston part and a lower piston part which has an internal, preferably annular cooling channel for cooling the piston during operation of the internal combustion engine. At least one inlet opening and at least one outlet opening are provided on the lower piston part, via which coolant flows in and out of the cooling channel.
  • the respective opening is surrounded by an annular bead or a ramp-like elevation, which prevents the coolant level from falling below a predefined level.
  • the annular bead or the ramp-like elevation is formed in one piece with the lower piston part.
  • the JP 2003 307153 A describes a piston for an internal combustion engine that is capable of effectively increasing the efficiency of piston cooling by improving the flow of a cooling oil having turbulence in a cooling channel.
  • the DE 10 2012 216 367 A1 shows a method for producing a piston having at least one cooling channel for an internal combustion engine, which piston is produced from at least one upper part and one lower part, wherein the cooling channel of the piston is formed with the aid of the upper part and the lower part and the upper part and the lower part of the piston are each produced with the aid of a forging process.
  • the FR 2 839 116 A1 describes a piston of an internal combustion engine which has an annular cooling channel which runs coaxially to the piston axis and is provided on its lower wall with an inlet opening through which lubricating oil penetrates and an outlet opening through which the lubricating oil exits.
  • the invention is based on the object of providing a piston with a cooling channel which is improved in terms of its cooling effect compared to the known pistons with cooling channels.
  • both a dam-shaped elevation in the area of the inlet and/or outlet opening is formed by a finished forged contour of the lower cooling channel area and the inlet contour of the inlet and/or outlet opening on the inside of the piston is formed by pre-forging.
  • contours that enable a minimum level to be maintained in the cooling channel can be realized directly with the manufacture of the lower part of the piston, which is manufactured independently of the upper part of the piston, in a forging process.
  • Manufacturing by forging has the advantage of a high-strength structure and flow lines that are appropriate to the load, so that a high-strength lower part is formed that already has the necessary contours to realize its function.
  • the pre-forging is funnel-shaped at the inlet opening, whereas it is additionally or alternatively cylindrical on the outlet side (i.e. in the area of the outlet opening).
  • a dam is created (formed) as a dam-shaped elevation, which runs across the width of the cooling channel (i.e. extends radially outwards from the direction of the piston centre point through which the piston stroke axis runs), so that a flow past the dam-shaped elevation (dam) in the cooling channel is largely prevented, whereas in the case of the piston according to the DE 10 2011 007 285 A1 a flow past is possible.
  • the elevation should reach a height of 20% to 80%, preferably 30% to 70% of the total height of the cooling channel.
  • the dam (the dam-shaped elevation) produced transversely to the cooling channel has at least one recess, preferably a plurality of recesses, at the transition between the dam and the wall of the cooling channel.
  • the invention provides that in the upper part of the piston consisting of the upper part and the lower part, the cooling channel is optionally also produced by forging and in the area of the inlet opening a V-shaped element is forged which protrudes into the cooling channel, which ensures that the impinging oil jet is deflected in both directions of the cooling channel in equal or different parts.
  • This V-shaped element thus serves as a jet splitter for the impinging oil jet which is injected through the inlet opening.
  • the measures according to the invention achieve an improved cooling effect for the thermally stressed areas of the piston through the measures on the cooling channel, in which the dam-shaped elevation ensures that a predeterminable coolant level remains in the cooling channel and at the same time does not impede the incoming oil jet by a backflow. Furthermore, the funnel-shaped design of the inlet opening increases the capture rate of the oil effectively entering the cooling channel.
  • the funnel-shaped inlet opening serves to capture the oil volume flows of at least two parallel or mutually inclined oil jets (which are emitted by one or more spray nozzles) over large areas of the piston stroke and to guide the oil into the cooling channel.
  • the funnel-shaped forging can take on any surface shape.
  • the oil provided by the oil spray nozzle can exit from one or more nozzle openings, although not all nozzle openings have to be open at the same time.
  • the design of the opposing contours of the dam and funnel makes it possible to achieve a wall thickness that is as uniform as possible, which has a positive effect on the manufacturing process and the weight of the piston.
  • the effectiveness of the production of the piston can be increased even further by also producing the top of the cooling channel using a forging process in the upper part of the piston, thus largely or completely eliminating the need for machining or post-processing.
  • the invention offers an improvement in the cooling effect through contours that are integrally formed on the piston without additional elements. This results in more efficient production of the piston and simplifies the processes. In addition, such a piston can be exposed to higher thermal loads while simultaneously reducing the need for cooling oil.
  • a piston 1 is shown in a section, which consists of a lower part 2 and an upper part 3.
  • the two parts 2, 3 are manufactured separately from each other and joined together in a suitable manner.
  • the piston 1 has, in a manner known per se, an outer circumferential ring field 4 and can, but does not have to, contain a combustion chamber bowl.
  • the lower part 3 forms a piston skirt 5 and a pin bore 6.
  • the two parts 2, 3 are permanently and inseparably connected to one another by means of a suitable joining process in order to form a one-piece, functional piston 1.
  • the joining process takes place in at least one joining plane 7.
  • the joining process is a friction welding process.
  • the piston 1 has a cooling channel 8.
  • the cooling channel 8 is formed by partial recesses in both the upper part 2 and the lower part 3. This has the advantage that the partial recesses are accessible before the two parts 2, 3 are joined together and therefore these partial recesses can be optimally manufactured or reworked, since they are no longer accessible after the two parts 2, 3 are joined together.
  • the piston 1 has at least one inlet opening 9 into which a free oil jet, which is emitted by an injection nozzle, is injected in the direction of the cooling channel 8.
  • This inlet opening 9, if it is the only opening, can also serve as an outlet opening for the cooling oil which circulates in the cooling channel 8.
  • a dam-shaped elevation 10 is provided next to the drain opening 9, starting from the lower bottom of the cooling channel 8.
  • This dam-shaped elevation 10 is formed when the lower part 3 is manufactured.
  • the lower part 3 can thus be manufactured, for example, in a casting process and the dam-shaped elevation can be formed in the process.
  • the lower part 3 can be manufactured in a casting process and the dam-shaped elevation 10 can then be formed by a forming process (such as a forging process).
  • both the lower part 3 with its geometries and the dam-shaped elevation 10 are manufactured in a forming process (such as a forging process).
  • this lower part is given an internal geometry 11 with a particularly funnel-shaped inlet contour 12 of the inlet opening 9.
  • the inlet contour 12 can also have a shape other than a funnel shape. It is important to form the inlet contour 12 preferably in a forging process and to give it a shape with which the oil jet injected into the inlet opening 9 is directed in a targeted manner in the direction of the cooling channel 8. It is also important that the dam-shaped elevation 10 next to the inlet opening 9 does not hinder the entry of the injected oil jet, so that the injected oil is directed all the way into the cooling channel 8.
  • Figure 2 shows a top view of the upper side of the lower part 3, which points in the direction of the upper part 2.
  • an inlet opening 9 there is also an outlet opening 13.
  • the cooling channel 8 is not completely circumferential, but is divided into at least two sub-segments, for example. In this case, for example, each sub-segment has its own inlet opening and its own outlet opening.
  • a dam-shaped elevation 10 is present on the lower part 3 on each side in the direction of the cooling channel 8 next to the inlet opening 9 and the outlet opening 13 and is formed in one piece by the latter.
  • the lower part 3 has an outer, circumferential joining surface 14 and an inner, circumferential joining surface 15, which are formed by corresponding webs of the lower part 3.
  • These joining surfaces 14, 15 face corresponding joining surfaces of the upper part 2, which also forms webs, at the end of which the joining surfaces are formed.
  • Figure 3 shows a sectional three-dimensional view of the piston 1, in which the two parts 2, 3 have been permanently and inseparably joined together.
  • the position of the inlet opening 9 with at least one associated dam-shaped elevation 10 as well as the position of the outlet opening 13 (in this case also with an associated dam-shaped elevation 10) can be seen.
  • Figure 4 shows analogous to the representation in Figure 2 in a three-dimensional view the top view of the upper part 3, where, as in Figure 2 recognizable, a portion of the cooling channel 8 is formed by the upper part 3.
  • Figure 5 shows a three-dimensional view of the underside of the upper part 2, which points in the direction of the lower part 3.
  • a dam-shaped elevation 10 in the area of the inlet opening 9) is also formed by the upper part 2.
  • the at least one dam-shaped elevation 10 is not arranged next to the opening, but is located in the extension of the cross section of the opening (inlet opening 9 and/or outlet opening 13), so that this dam-shaped elevation 10 serves as a jet splitter in the partial area of the cooling channel 8 of the upper part 2.
  • this jet splitter the oil jet injected in particular through the at least one inlet opening 9 is divided and can be divided in both directions of the cooling channel 8 in equal or different parts.
  • the dam-shaped elevation 10 produced transversely to the cooling channel 8 has at least one recess 16, preferably several recesses, at the transition between the elevation 10 and the wall of the cooling channel 8, in particular in the apex region of the cooling channel 8. This makes it possible for a portion of the cooling oil which circulates in the cooling channel 8 to always be able to circulate there without being hindered by the dam-shaped elevation 10.
  • FIG. 6 Finally, the internal geometry 11 of the piston 1 is shown, in which the parts 2, 3 described above have been joined together.
  • a dam-shaped elevation 10 serving as a jet splitter is provided in the area of the drain opening 9 on the upper part 2, pointing downwards in the area of the cross section of the drain opening 9, a dam-shaped elevation 10 serving as a jet splitter is provided in the area of the drain opening 9 on the upper part 2, pointing downwards in the area of the cross section of the drain opening 9, a dam-shaped elevation 10 serving as a jet splitter is provided.
  • the orientation of the dam-shaped elevation 10 shown either in the lower part 3 and/or the upper part 2 is exemplary and preferably extends radially from the piston stroke axis. Other radial orientations deviating from this are of course also conceivable.

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

Claims (5)

  1. Piston (1) d'un moteur à combustion interne, constitué d'une partie supérieure (2) et d'une partie inférieure (3) qui sont reliées l'une à l'autre, dans lequel un canal de refroidissement (8) est prévu, lequel comprend au moins une ouverture d'entrée (9) et/ou au moins une ouverture de sortie (13) destinées à un liquide de refroidissement, dans lequel à la fois une élévation en forme de barrage (10) dans la région de l'ouverture d'entrée (9) et/ou de l'ouverture de sortie (13) est formée par un contour forgé fini d'une région de canal de refroidissement inférieure et un contour d'entrée (12) de l'ouverture d'entrée (9) et/ou de l'ouverture de sortie (13) est formé sur un côté intérieur (11) du piston (1) par un forgeage préalable, dans lequel un élément en forme de V, qui fait saillie dans le canal de refroidissement (8), est forgé sur une région de canal de refroidissement supérieure dans la région de l'ouverture d'entrée (9) en tant qu'élévation en forme de barrage supplémentaire (10), et dans lequel l'élévation en forme de barrage (10) produite transversalement au canal de refroidissement (8) sous la forme de l'élément en forme de V comprend au moins un évidement (16) au niveau d'une transition entre l'élévation en forme de barrage (10) sous la forme de l'élément en forme de V et une paroi du canal de refroidissement (8).
  2. Piston (1) selon la revendication 1, caractérisé en ce que le forgeage préalable au niveau de l'ouverture d'entrée (9) a une forme d'entonnoir.
  3. Piston (1) selon la revendication 1 ou la revendication 2, caractérisé en ce que le forgeage préalable est cylindrique au niveau de l'ouverture de sortie (13).
  4. Piston (1) selon la revendication 1, la revendication 2 ou la revendication 3, caractérisé en ce que, après la production de la partie inférieure (3) pendant le forgeage, un barrage est formé en tant qu'élévation en forme de barrage (10) qui s'étend sur la largeur du canal de refroidissement (8).
  5. Piston (1) selon la revendication 4, caractérisé en ce que l'élévation en forme de barrage (10) atteint une hauteur de 20 % à 80 %, de préférence de 30 % à 70 %, de la hauteur totale du canal de refroidissement (8).
EP17822262.6A 2016-12-19 2017-12-19 Canal de refroidissement comprenant une digue et une trémie Active EP3555451B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016124804 2016-12-19
PCT/EP2017/083578 WO2018114969A1 (fr) 2016-12-19 2017-12-19 Canal de refroidissement comprenant une digue et une trémie

Publications (2)

Publication Number Publication Date
EP3555451A1 EP3555451A1 (fr) 2019-10-23
EP3555451B1 true EP3555451B1 (fr) 2024-12-04

Family

ID=60857071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17822262.6A Active EP3555451B1 (fr) 2016-12-19 2017-12-19 Canal de refroidissement comprenant une digue et une trémie

Country Status (7)

Country Link
US (1) US11053885B2 (fr)
EP (1) EP3555451B1 (fr)
CN (1) CN110121590B (fr)
DE (1) DE102017130546A1 (fr)
MX (1) MX2019006067A (fr)
PL (1) PL3555451T3 (fr)
WO (1) WO2018114969A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11326549B2 (en) * 2020-01-21 2022-05-10 Ford Global Technologies, Llc 218-0266 volcano-shaped inlet of piston oil-cooling gallery
DE102021133609B3 (de) 2021-12-17 2023-02-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kolben mit funktionsoptimierten Kolbenkühlung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53154907U (fr) * 1977-05-11 1978-12-05
DE102011007285A1 (de) * 2011-04-13 2012-10-18 Mahle International Gmbh Kolben für eine Brennkraftmaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003307153A (ja) 2002-04-11 2003-10-31 Toyota Industries Corp 内燃機関のピストン
FR2839116B1 (fr) * 2002-04-24 2004-10-15 Renault Sa Piston a galerie de refroidissement pour moteur a combustion interne
US9238283B2 (en) 2008-07-24 2016-01-19 Ks Kolbenschmidt Gmbh Friction welded steel piston having optimized cooling channel
DE102010056220A1 (de) * 2010-12-24 2012-06-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102012216367A1 (de) 2011-09-28 2013-03-28 Ks Kolbenschmidt Gmbh Zweiteiliger Stahlkolben für Brennkraftmaschinen
JP6370394B2 (ja) 2014-02-21 2018-08-08 カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツングＫＳ Ｋｏｌｂｅｎｓｃｈｍｉｄｔ ＧｍｂＨ シリンダ毎に少なくとも１つの冷却オイルノズルを有する内燃機関用の、閉じられたクーリングチャンバなしのピストン、及び当該ピストンを冷却する方法
US9989008B2 (en) * 2014-04-09 2018-06-05 Ks Kolbenschmidt Gmbh Elongate cooling channel inlet for cooling channel pistons and method for operating
CN106337754B (zh) 2015-07-10 2018-11-30 强哲菲 一种水平式活塞及水平对置发动机
DE102016122080A1 (de) 2015-11-19 2017-05-24 Ks Kolbenschmidt Gmbh Gegossene Zu- und Ablauföffnungen bei Stahlguss- und Eisengusskolben

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53154907U (fr) * 1977-05-11 1978-12-05
DE102011007285A1 (de) * 2011-04-13 2012-10-18 Mahle International Gmbh Kolben für eine Brennkraftmaschine

Also Published As

Publication number Publication date
MX2019006067A (es) 2019-08-12
CN110121590B (zh) 2022-06-10
DE102017130546A1 (de) 2018-06-21
EP3555451A1 (fr) 2019-10-23
US11053885B2 (en) 2021-07-06
PL3555451T3 (pl) 2025-04-14
US20190323450A1 (en) 2019-10-24
CN110121590A (zh) 2019-08-13
WO2018114969A1 (fr) 2018-06-28

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