EP1456519A1 - Support de segment de piston a canal de refroidissement - Google Patents

Support de segment de piston a canal de refroidissement

Info

Publication number
EP1456519A1
EP1456519A1 EP02785004A EP02785004A EP1456519A1 EP 1456519 A1 EP1456519 A1 EP 1456519A1 EP 02785004 A EP02785004 A EP 02785004A EP 02785004 A EP02785004 A EP 02785004A EP 1456519 A1 EP1456519 A1 EP 1456519A1
Authority
EP
European Patent Office
Prior art keywords
ring
piston
cast
cooling channel
carrier according
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.)
Withdrawn
Application number
EP02785004A
Other languages
German (de)
English (en)
Inventor
Karl Merz
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1456519A1 publication Critical patent/EP1456519A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons pistons
    • 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
    • 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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/22—Rings for preventing wear of grooves or like seatings

Definitions

  • the present invention relates to a piston ring carrier with a cooling channel for casting into a light metal cast piston for an internal combustion engine, the piston ring carrier comprising a casting ring and the cooling channel being delimited by at least one first annular element made of sheet metal material and carried by the casting ring.
  • Pistons with cooled piston rings and corresponding piston ring carriers with a cooling channel through which a coolant circulates are increasingly required in the course of the striking increase in injection and compression pressure in modern internal combustion engines.
  • a first known piston ring carrier of the type mentioned two ring elements are formed as partial shells from a stainless steel sheet material, each with an inward into the cooling channel, i.e. thus provided in a ring plane bent collar and with this collar in abutment against each other, the welding is carried out by laser technology along the gap between the collars in the splitting plane.
  • the connection of the partial shells with the cast ring is made along its inner edges by micro plasma welding with material application.
  • the cooling channel is formed by the cast ring and a one-piece, in cross section approximately U-shaped or C-shaped ring element made of stainless steel sheet welded into the casting ring, the free edges of the ring element being sharp
  • BESTATIGUNGSKOPIE trained grooves are bent along the inner edges of the casting and are fixed therein by welding and / or soldering technology.
  • a piston ring carrier known from US-A-6, 105,540 is of similar design, but in which a one-piece, approximately u-shaped or c-shaped ring element made of stainless steel sheet is reduced in diameter under pressure and is thus pressed into the cast ring before it is welded to it.
  • the known piston ring carriers are alfinized before being poured into the pistons in order to produce an alfin layer on their surface, with which the cast material of the aluminum-based pistons can adequately bond. Alfining takes place at approx. 760 ° C in a liquid alfin bath. The parts are previously annealed at approx. 230 ° C and their oxide layer is removed by corundum blasting.
  • the cooling channel which is initially self-contained, must also be drilled from the interior of the piston after it has been poured into the piston in order to establish a connection between the piston interior and the cooling channel for the flow of a coolant. It can happen that the connection between the casting material of the piston and the cooling channel is torn off around the borehole, which in turn is not tolerable and leads to rejects.
  • types of light metal cast pistons which are provided with a piston ring carrier, but which are not directly connected to a cooling channel. Rather, a cooling channel is arranged at a distance from the piston ring carrier in the casting piston, and in this respect is essentially completely embedded in the casting material.
  • a cooling channel is arranged at a distance from the piston ring carrier in the casting piston, and in this respect is essentially completely embedded in the casting material.
  • the present invention has in particular the object of specifying a piston ring carrier with a cooling channel of the type mentioned at the outset, which is simpler, more efficient, faster and with significantly less waste and thereby is generally less expensive to produce.
  • This object is achieved according to the invention by a piston ring carrier with a cooling channel as defined in claim 1.
  • the piston ring carrier according to the invention is accordingly characterized in that the outer ring of the first ring element overlaps the inner radius of the cast ring and in this overlap area with the cast ring by resistance welding connected is.
  • This welding process results in a good and possibly also tight weld connection between the parts which cannot be welded well to one another.
  • the welding process is extremely fast and, for example, only takes about 40 milliseconds.
  • the cooling channel is delimited, apart from the first, at least also by a second ring element made of sheet metal material, the two ring elements, each with an inner collar oriented essentially in the axial direction, overlapping one another and essentially in the axial direction along one of these inner collars Laser welding are interconnected.
  • the welding in the axial direction is technically much easier to carry out than the welding mentioned perpendicular to it in a ring plane. If the same material is used for both ring elements, the laser welding can also be carried out very quickly in the course of only about one second, with a reproducibly tight weld seam being produced.
  • the cooling channel is delimited not only by the two ring elements but also by the cast ring and that the two ring elements with their outer radius each overlap the inner radius of the cast ring and are connected to the cast ring in each of these overlap regions by resistance pressure welding.
  • the cast ring is simply inserted between the two partial shells during manufacture before they are welded together in the axial direction by laser welding along the free edge of the inner collar.
  • the two partial shells are very easy to produce in terms of stamping and forming, and they only have to be machined from one direction, namely their axial direction.
  • the inner collar formed on them does not have to be very high.
  • their outside diameter and thus the mutual overlap with the cast ring can be chosen as large as desired.
  • the problematic connection between the stainless steel sheet metal parts and the cast ring in the prior art can also be produced easily and reproducibly by the resistance pressure welding, the mutual overlap of the stainless steel partial shells with the cast ring, which can be chosen as desired, being an additional advantage for the resistance welding.
  • the welding process is also extremely fast and, for example, only takes about 40 milliseconds.
  • the cooling duct is arranged at a distance from the cast ring, which is not limited to the cooling duct itself, but is at least connected to the cooling duct via the first ring element.
  • the casting ring and cooling channel thus form a unit which, as such, can be introduced into the casting mold during the production of the casting pistons. The use and complex additional placement of individual salt rings or the like is eliminated.
  • the cast ring is connected exclusively to the first ring element.
  • the first ring element could in principle be designed such that it limits the cooling channel alone.
  • first ring element can be provided between the cast ring and the cooling channel.
  • first ring element can be designed conically between the cast ring and the cooling channel.
  • At least one hollow nipple is formed on the first or a further ring element, which, after the piston ring carrier has been poured into the cast piston, facilitates the production of a connecting channel for the coolant between the cooling channel and the interior of the piston.
  • drilling the cooling channel itself and, if necessary, loosening its connection to the surrounding casting material it is sufficient to drill the hollow nipple, which is much less critical if the hollow nipple is placed alone because of the shallower drilling depth, especially if the hollow nipple is on it free end with a round cap is provided.
  • the hollow nipple can also be made so long that it protrudes into the interior of the piston.
  • the hollow nipple only has to be shortened, for example in terms of cutting technology, and there is no need to drill out the connecting channel.
  • an opening can also be provided in the free end of the hollow nipple, which allows air to escape from the cooling channel during the finishing.
  • the cross section of the opening may only be so large that, conversely, due to its surface tension, the liquid alfin cannot penetrate the cooling channel.
  • the opening in the cooling channel provides the air in the cooling channel with a defined escape option, so that no excess pressure can occur in the cooling channel even under the high temperatures in the Alfin bath. As a result, the welded connections are not stressed and it can certainly be avoided that air escapes at another point.
  • the local oxidation around the opening associated with the air outlet through the opening on the hollow nipple is harmless because the corresponding area of the hollow nipple is anyway removed again after being poured into the piston by drilling or shortening.
  • Fig. 1 shows an embodiment of a piston ring carrier with a directly connected
  • Cooling channel according to the invention in section, wherein the individual elements are not yet fully welded together;
  • FIG. 2 shows the piston ring carrier of FIG. 1 between two welding tongs of a resistance welding device
  • FIG. 3 shows a section of a finished piston ring carrier with a cooling channel according to the invention cast in a light metal cast piston, the right part of the figure additionally showing a connecting channel for the coolant flow between an interior of the piston and the cooling channel;
  • Fig. 4 on a ring element of the cooling channel of the inventive
  • Piston ring carrier the formation of a mounting lug and the placement of a hollow nipple thereon;
  • FIG. 5 shows the use of such a hollow nipple for producing the connecting channel between the piston interior and the cooling channel in a representation according to the right part of FIG. 3;
  • Fig. 7 in a representation according to the right part of Fig. 3, the use of a long hollow nipple for producing the connecting channel between the piston interior and the cooling channel, the hollow nipple extending into the piston interior.
  • Fig. 8 shows an embodiment of a piston ring carrier with a spaced cooling channel according to the invention in section
  • Cast-in light alloy cast iron Cast-in light alloy cast iron.
  • 1 denotes a cast ring of a piston ring carrier, a groove for the piston ring not being inserted here.
  • the cast ring 1 is inserted between two likewise ring-shaped elements 2 and 3 made of a thin stainless steel sheet, each of which is provided along its inner radius with an inner collar 2.1 or 3.1 formed in the axial direction, ie perpendicular to the ring plane.
  • the inner radii of the two ring elements 2 and 3 are matched to one another so that the ring elements 2 and 3 with their inner collars 2.1 and 3.1 can be inserted into one another in close mutual contact.
  • Fig. 1 shows the two ring elements inserted in such a way, with their inner collars 2.1 and 3.1 overlap each other to a certain extent.
  • the cast ring 1 also overlaps the two Ring elements 2 and 3 in that its inner radius is smaller than the outer radii of the ring elements.
  • the three parts described i.e. the cast ring 1 and the ring elements 2 and 3 together form a circumferential cooling duct 4. Accordingly, the two ring elements 2 and 3 each form partial shells of the cooling duct 4.
  • a circumferential weld seam 5 is produced between the two ring elements 2 and 3 along the free edge of the inner collar 2.1, which is smaller in diameter, by laser welding in the axial direction AR, which is shown in the right part of FIG.
  • the ring elements 2 and 3 are connected in their overlap area with the cast ring 1 by resistance pressure welding in a corresponding resistance pressure welding device with welding electrodes 6 and 7.
  • the two inner collars could also be arranged at a certain angle with respect to the axial direction and the laser welding could also only be carried out essentially in the axial direction.
  • the only decisive factor is that the weld seam can be carried out with a laser welding head arranged outside the ring plane and without deflecting the laser beam into the ring plane.
  • FIG. 3 shows a finished piston ring carrier 1 with a cooling channel 4 according to the invention already cast into a light metal cast piston 10, wherein the groove 11 for the piston ring has already been inserted into the cast ring.
  • the piston 10 is only partially shown. However, a depression 12 can be seen in its end face towards the combustion chamber and a hollow or interior space 13 which is open to the connecting rod and thus to the oil pan of the engine.
  • a plurality of connecting channels between the cooling channel 4 and the piston interior 13 are provided over the circumference of the cooling channel 4.
  • such a connecting channel 14 is shown, as can be produced from interior space 13, for example, by drilling after casting piston 10. Since there is a risk here of loosening the connection between the thin sheet material of the cooling channel and the surrounding cast material of the piston, for example in the area denoted by 15, an alternative for producing the connecting channels is explained below.
  • Fig. 4 shows in a detail e.g. the ring element or the cooling channel partial shell 2, on which a fastening lug 16 is formed. This can simply be produced by punching and / or drawing technology when punching out the ring element 2 and / or pulling out the inner collar 2.1.
  • a tubular hollow nipple 17 is welded on, this not necessarily vertically but also at an oblique angle.
  • the hollow nipple 17 is closed at its free end and provided with a round cap.
  • FIG. 5 now shows piston 10 with a piston ring carrier 1 according to the invention cast therein, with cooling channel 4, on which a hollow nipple 17 according to FIG. 4 is formed.
  • the hollow nipple 17 serves here as a section of the connecting channel 14, for the production of which it is sufficient to drill and drill only the free end of the hollow nipple.
  • the rounded end cap of the nipple makes drilling even easier.
  • a small opening 18 could also be provided at the free end of the hollow nipple 17, through which air can escape from the cooling channel during the finishing, as shown in FIG. 6.
  • the nipple 17 could also be made so long that it protrudes into the piston interior 13 and therefore not at all needs to be drilled, as shown in FIG. 7. In this case, to open the connecting channel 14, it is sufficient to remove the end projecting into the interior 13 by cutting.
  • the opening of the cooling channel from the piston interior 13 could also be carried out by eroding, with or without a hollow nipple.
  • FIG. 8 shows an embodiment of a piston ring carrier according to the invention with a cast ring 21 and a cooling channel 24 spaced therefrom.
  • the cooling channel 24 is delimited by a first ring element 22 and by a second ring element 23, both of which consist of a stainless steel sheet.
  • first ring element 22 is here in connection with the cast ring 21 and overlaps this or its inner radius with a larger outer radius.
  • the parts, i.e. the cast ring and the first ring element are joined together by resistance pressure welding.
  • the corresponding weld seam is preferably all-round.
  • the first ring element 22 initially has a conical section 22.1, in which a plurality of windows 22.2 are punched out over the circumference, in its overlap region with the cast ring 21. Further inward, the first ring element 22 is followed by a groove 22.3 which is approximately U-shaped in cross section and which in turn has an inner collar 22.4 oriented in the axial direction.
  • the channel 22.3 is closed by forming the cooling channel 24 by the second ring element 23, which is also provided at least on the inside with an inner collar 23.1 oriented in the axial direction.
  • the two ring elements 22 and 23 are inserted into one another in such a way that their two inner collars are in close mutual contact and are connected to one another by means of a circumferential laser welding which is carried out in the axial direction or essentially in the axial direction.
  • a corresponding laser weld seam is present in a second overlap region of the two ring elements 22 and 23 which is further out.
  • the second ring element 23 lies with an outer collar 23.2 on the conical section 22.2 of the first ring element 22 and is welded to the first ring element 22 along this outer collar 23.2.
  • the outer collar 23.3 could also be oriented the other way round and point into the cooling channel 24.
  • the two ring elements can also be produced very easily by deformation in only one direction (axial direction). The joining and connecting of the individual parts only requires operations in this direction, which is a decisive advantage especially for large-scale production.
  • FIG. 9 shows the piston ring carrier of FIG. 8 cast in a light metal cast piston 30, it being particularly clear in this illustration how the cooling channel 24 is spaced from the cast ring 21 and, moreover, is not in the same plane as this.
  • a section A of FIG. 9 also shows how the cooling channel 24 could also be produced in one piece from a single ring element 22.
  • This section A also shows that a hollow nipple 17 could also be formed on the cooling channel 24 spaced from the cast ring.
  • a hollow nipple 17 could of course also be provided on a multi-part cooling duct 24 and be designed in accordance with each of the above-described configurations.

Landscapes

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

Abstract

L'invention concerne un support de segment de piston à canal de refroidissement, destiné à être coulé dans un piston coulé en métal léger monté dans un moteur à combustion interne. Ce support de segment de piston comporte un anneau coulé (1). Le canal de refroidissement (4) est délimité par au moins un premier élément annulaire (2) en tôle et supporté par l'anneau coulé (1). Le rayon extérieur du premier élément annulaire (2) chevauche le rayon intérieur de l'anneau coulé (1). Dans cette zone de chevauchement, le premier élément annulaire est relié à l'anneau coulé (1) par soudage par résistance. De préférence, le canal de refroidissement (4) est délimité par deux éléments annulaires (2, 3) en tôle d'acier spécial qui se chevauchent dans le sens axial et sont reliés par soudage au laser dans le sens axial. Le canal de refroidissement (4) peut être directement adjacent à l'anneau coulé (1) ou bien être situé à distance de ce dernier.
EP02785004A 2001-12-21 2002-12-23 Support de segment de piston a canal de refroidissement Withdrawn EP1456519A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CH23502001 2001-12-21
CH235001 2001-12-21
CH3432002 2002-02-27
CH3432002 2002-02-27
PCT/CH2002/000723 WO2003054371A1 (fr) 2001-12-21 2002-12-23 Support de segment de piston a canal de refroidissement

Publications (1)

Publication Number Publication Date
EP1456519A1 true EP1456519A1 (fr) 2004-09-15

Family

ID=25736916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02785004A Withdrawn EP1456519A1 (fr) 2001-12-21 2002-12-23 Support de segment de piston a canal de refroidissement

Country Status (3)

Country Link
EP (1) EP1456519A1 (fr)
AU (1) AU2002350364A1 (fr)
WO (1) WO2003054371A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006031094A1 (de) * 2006-07-05 2008-01-10 Ks Kolbenschmidt Gmbh Kühlmediumübertritt im Kolben mit kleiner Kompressionshöhe
FR3112375B1 (fr) * 2020-07-10 2022-12-02 Renault Sas Porte-segment pour piston.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7617370U1 (de) * 1976-05-31 1976-10-07 Alcan Aluminiumwerk Nuernberg Gmbh, 6000 Frankfurt Kolben, insbesondere fuer brennkraftmaschinen
DE2624412C3 (de) * 1976-05-31 1983-12-01 Alcan Aluminiumwerk Nürnberg GmbH, 6000 Frankfurt Verfahren zur Herstellung von Kolben mit einem Ringkanal
US4907545A (en) * 1988-12-28 1990-03-13 Caterpillar Inc. Liquid cooled piston ring carrier assembly and piston using same
JP2670388B2 (ja) * 1991-03-27 1997-10-29 日野自動車工業株式会社 エンジン用ピストンの中空耐摩環
DE19750021A1 (de) 1997-11-12 1999-05-20 Mahle Gmbh Gekühlter Ringträger
DE10011155A1 (de) * 2000-03-07 2001-09-13 Mahle Gmbh Kolben für Verbrennungsmotoren mit einer Ringträger-Kühlkanal-Kombination

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03054371A1 *

Also Published As

Publication number Publication date
AU2002350364A1 (en) 2003-07-09
WO2003054371A1 (fr) 2003-07-03

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