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WO2008148425A1 - Piston composite destiné à des moteurs à combustion interne comportant un canal de refroidissement entièrement fermé - Google Patents

Piston composite destiné à des moteurs à combustion interne comportant un canal de refroidissement entièrement fermé Download PDF

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Publication number
WO2008148425A1
WO2008148425A1 PCT/EP2007/055581 EP2007055581W WO2008148425A1 WO 2008148425 A1 WO2008148425 A1 WO 2008148425A1 EP 2007055581 W EP2007055581 W EP 2007055581W WO 2008148425 A1 WO2008148425 A1 WO 2008148425A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
component
joining
contour
outer component
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.)
Ceased
Application number
PCT/EP2007/055581
Other languages
German (de)
English (en)
Inventor
Matthias Prussak
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.)
CDP Bharat Forge GmbH
Original Assignee
CDP Bharat Forge 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 CDP Bharat Forge GmbH filed Critical CDP Bharat Forge GmbH
Priority to PCT/EP2007/055581 priority Critical patent/WO2008148425A1/fr
Publication of WO2008148425A1 publication Critical patent/WO2008148425A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • 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
    • F02F3/18—Pistons  having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston

Definitions

  • the invention relates to a composite piston for internal combustion engines with completely closed Kuhlkanal and a method for its preparation.
  • Combustion temperatures can be realized ("clean combustion").
  • Blacksmith materials have indisputable advantages over the cast materials with regard to the properties that can be achieved, in particular fatigue strength at elevated temperatures.
  • degrees of freedom compared to the casting are limited, especially with regard to the formation of the undercut Kuhlkanals.
  • the structural height of the piston is greater than in two-part, built solutions, as a minimum height for the axial gap of the cooling channel can not be fallen below in order to make the Kuhlkanal the mechanical processing accessible.
  • Closed Kuhlkanal means in this context not only a purely mechanical closing ("Zudeckein") of an open Kuhlkanals with a spring plate but also the assumption of forces in the direct power flow through mechanical and constructive connection of the piston lower part (combustion trough / piston head) circumferentially bearing and shirt area (Piston shaft).
  • a one-piece forged piston design with a closed coolant channel is known from EP 1 611 975 A1.
  • a closed coolant channel is formed by circumferential "closing" of the flange and wearing of the piston head against the piston shaft.
  • a closed connection between the shaft region and the piston head can be achieved and the flexural rigidity of the piston can be increased.
  • a very compact construction height is possible because the inner contour of the cooling channel is easily accessible due to the selected production technology of a processing. Again, however, the material for the entire component must always meet the highest of all possible loads, which leads to higher material costs. The manufacturing costs are further increased, since the radial flange must be trimmed by a special bending technology circumferentially against the shaft and thus is not classified as "schmiedeLER".
  • one-piece pistons with closed coolant channel can be produced by forging technology, this is only possible possible under high material and manufacturing costs. This is why increasingly built or assembled pistons are moving into the focus of the developers.
  • the built piston also has the advantage that the designer can combine different materials adapted to the respective tasks.
  • high-temperature steel grades are preferably used, whereas aluminum is also used as a material in the shaft area for reasons of weight.
  • WO 00/53913 A1 An example of a built-up piston is described in WO 00/53913 A1, in which the piston head and the piston shaft are screwed axially by means of expansion screws.
  • the optimal materials for piston head and piston skirt can be combined depending on the main load and undercut contours or closed cavities (cooling channel) can be realized relatively easily.
  • the now possible closed connection between the shaft area and piston head increases the bending stiffness of the piston.
  • the screw height increases the height of the piston and compared to one-piece solutions, an additional installation effort is necessary.
  • the expansion bolts as a link also represent a weak point, especially when the system is subjected to cyclic loads (in this case thermally and mechanically) constantly alternating strains.
  • Friction welds also a certain risk, since on the one hand represent weak points in terms of strength and on the other hand, the introduction of residual scale in the cooling channel can never be definitely excluded. Also, the free choice of materials for the individual components is already limited again, since due to the selected connection technology, the weldability of the components must be given.
  • a piston according to the invention for internal combustion engines has a compact inner component, which forms the interior of the piston bearing and the piston head, and a sleeve-shaped outer component, which forms the outer contour of the piston head with Brennmulde and Ringaniwitz and the piston shaft with tread and Pleuelbolzenbohrung.
  • the interior of the piston skirt is in this case that structure which serves for the construction of the connecting rod bore on the connecting rod side and serves to form one or more cooling channels on the combustion chamber side.
  • the inner component of the piston has at least one radial rib with a dimension (D) that substantially corresponds to the inner diameter of the outer component.
  • the dimension of the at least one radial rib is to be understood here as the distance between the respective outermost points of the rib (s) at the point at which the inner diameter of the outer component is measured.
  • the inner and outer components form a liquid or gas-tight cavity, which is suitable for receiving cooling media.
  • This cavity represents the closed cooling channel, wherein the shape of the cooling channel can be freely adapted to the requirements by known processing methods.
  • the inner component is supported on the inner contour of the outer component via the at least one rib in the axial and radial direction and via one or more shoulders in the region of the combustion trough in the axially opposite direction.
  • the at least one radial rib is formed as a circumferential flange contour whose dimension is given by its outer diameter.
  • the at least one radial rib or the flange may have a symmetry corresponding to the mechanical and thermal requirements, it is preferred that the at least one radial rib or the flange of the piston according to the invention is rotationally symmetrical. This form provides optimal support for most applications and thus power and heat transfer between the outer and inner components.
  • At least one additional cavity is formed between the upper side of the inner component and the inner contour of the outer component, which can be used for additional cooling of the piston head.
  • one or more additional cavities lying directly under the combustion trough are advantageous, since usually the highest temperatures in the combustion trough arise during the combustion and therefore an efficient cooling is of particular importance with regard to material life.
  • the inner component and the outer component consist of different materials.
  • the materials may be selected depending on the load case, strength or weight ratio and other required properties.
  • An inventive method for producing a piston for internal combustion engines comprises first inserting a compact inner component, which will form the interior of the piston skirt and the piston head, into a sleeve-shaped outer component, which the outer contour of the piston head with Brennmulde and Ringani Scheme and the piston shaft with tread and Pleuelbolzenbohrung will form, wherein the inner component has at least one radial rib with a dimension D, which corresponds substantially to the inner diameter of the outer component, and form the inner and outer components already in the initial state before the subsequent joining a cavity.
  • the following step is the joining of the outer component in the axial and radial direction via the at least one radial rib and in the axially opposite direction via one or more shoulders in the region of the combustion trough on the outer contour of the inner component, so that the cavity liquid or gas tight is closed.
  • the at least one radial rib is formed as a circumferential flange contour whose dimension is given by its outer diameter.
  • the joining of the outer component to the inner component is performed such that no axial displacement between inner component and outer component is possible.
  • This is particularly advantageous for applications in which a particularly high flexural rigidity is required, which absorbs both thermal and mechanical loads.
  • the mechanical loads that occur in the axial direction for example, due to particularly high mass or other mechanical forces are generally higher than the thermal loads that occur in the radial direction, so also thermal loads in the radial direction can be cleanly absorbed and derived ,
  • the joining of the outer component to the inner component is carried out such that an axial displacement between inner component and outer component is possible to compensate for thermally induced expansion differences. It can be so targeted tolerances between the two components are introduced, for example, between the shoulder (s) of the inner component and the combustion chamber trough corresponding inner contour of the outer component.
  • the joining is preferably a defined circumferential bending, flanging, folding, pressing or clamping process. These joining methods are inexpensive to carry out and easily achieve the necessary joining forces. Depending on the desired properties of the finished piston may be advantageous that the joining takes place in the cold, semi-warm or warm state. In this way, an optimal joining process and thus an optimal mechanical and thermal connection of the piston components can be ensured in function of the selected materials of the respective components.
  • bias voltages can specifically increase the strength of the connection between the components and improve the mechanical power transmission and the thermal conductivity of the piston.
  • the life of the piston can be positively influenced.
  • additional joining elements that are positive, positive or material fit can preferably be used, thereby reinforcing the bond between the inner and outer components.
  • the annular grooves are introduced into the outer component and / or the Pleuelbolzenbohrung in the inner and outer components after joining. In this way, damage to the grooves or holes during joining are avoided.
  • the inner component is drilled prior to joining and the outer component is pressed by the joining in the bore of the inner component, so that additional force or positive connection is formed.
  • Fig. 1 is a sectional view of a first embodiment of the invention showing in the left half a piston according to the invention before joining and in the right half after joining, wherein no connecting rod hole was drilled prior to joining;
  • Fig. 2 is a sectional view similar to Fig. 1, in which the connecting rod hole was drilled prior to joining.
  • FIG. 1 is a sectional view of a first embodiment of a composite piston in which the left half of the figure shows the initial state of the piston before joining and the right half of the figure shows the joined state of the piston.
  • FIG. 1 also illustrates a first embodiment of the method according to the invention for producing a piston for internal combustion engines, in which no connecting rod bore is introduced before the joining step.
  • the inner component 1 of the piston in the initial state, before joining, is inserted into the outer component 2, the inner diameter D of the flange 5 of the inner component 1 substantially corresponding to the inner diameter of the outer component 2.
  • the diameter D of the flange 5 is equal to the inner diameter of the outer component 2, except for manufacturing-related tolerances or specifically introduced clearance.
  • the diameter D must also be chosen so that a easy insertion of the inner to the outer component is possible.
  • the inner component 1 has at its combustion chamber end end end a circumferential shoulder 6 and a central shoulder 7, which face the inner contour of the combustion bowl of the outer component 2.
  • a circumferential cavity 3 is formed, which is adapted to receive a Kuhlstoffs such. Ol, will serve.
  • a further cavity 4 is formed, in which also Kuhlfluid can circulate.
  • the cavities 3, 4 are supplied by Kuhlfluid not shown here channels in the inner component 1.
  • the annular grooves and Pleuelbolzenbohrung are introduced only after the joints, so that in particular the annular grooves can not be damaged by the joints.
  • the connecting rod bore 8 is introduced into the inner component 1 before the joints.
  • the shaft wall of the outer component 2 in the in pressed in the inner component 1 Pleuelbolzenbohrung.
  • the pushing in can however also be carried out by a special procedure, eg by means of a punch. In this way, an additional support is provided by the depressed into the connecting rod bore 8 bore flanges 9 of the outer component 2 and increases the mechanical strength of the positive and / or non-positive connection of the piston components 1 and 2.

Landscapes

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

Abstract

L'invention concerne un piston destiné à des moteurs à combustion interne, comportant un composant intérieur compact (1) formant l'intérieur de la tige de piston et de la tête de piston, et un composant extérieur (2) en forme de manchon, formant le contour extérieur de la tête de piston avec cavité de combustion et zone support annulaire, et de la tige de piston avec surface de roulement et perçage d'axe de bielle. Le composant intérieur (1) présente au moins une nervure radiale (5) de dimension (D) correspondant essentiellement au diamètre intérieur du composant extérieur (2). Les composants (1, 2) forment un espace creux (3) étanche aux liquides et aux gaz, destiné à contenir des fluides de refroidissement, et le composant intérieur (1) s'appuie au moyen du rebord (5) en direction axiale et radiale, et au moyen d'un ou plusieurs épaulements (6, 7) dans la zone de la cavité de la chambre de combustion dans la direction axialement opposée, sur le contour intérieur du composant extérieur (2). Selon le procédé, un composant intérieur (1) formant l'intérieur de la tige de piston et de la tête de piston, est inséré dans un composant extérieur (2) en forme de manchon, formant le contour extérieur de la tête de piston avec cavité de combustion et zone support annulaire, et de la tige de piston avec surface de roulement et perçage d'axe de bielle, le composant intérieur (1) présentant au moins une nervure radiale (5) de dimension (D) correspondant essentiellement au diamètre intérieur du composant extérieur (2), et les composants (1, 2) formant un espace creux (3). Le composant extérieur (2) est ensuite logé dans les directions axiale et radiale sur le contour de rebord (5), et dans la direction axialement opposée, au moyen d'un ou plusieurs épaulements (6, 7) dans la zone de la cavité de la chambre de combustion, sur le contour extérieur du composant intérieur (2), de telle manière que l'espace creux (3) est fermé de façon étanche aux liquides et aux gaz.
PCT/EP2007/055581 2007-06-06 2007-06-06 Piston composite destiné à des moteurs à combustion interne comportant un canal de refroidissement entièrement fermé Ceased WO2008148425A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/055581 WO2008148425A1 (fr) 2007-06-06 2007-06-06 Piston composite destiné à des moteurs à combustion interne comportant un canal de refroidissement entièrement fermé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/055581 WO2008148425A1 (fr) 2007-06-06 2007-06-06 Piston composite destiné à des moteurs à combustion interne comportant un canal de refroidissement entièrement fermé

Publications (1)

Publication Number Publication Date
WO2008148425A1 true WO2008148425A1 (fr) 2008-12-11

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ID=39217975

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/055581 Ceased WO2008148425A1 (fr) 2007-06-06 2007-06-06 Piston composite destiné à des moteurs à combustion interne comportant un canal de refroidissement entièrement fermé

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Country Link
WO (1) WO2008148425A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016204859B3 (de) * 2016-03-23 2017-06-29 Hirschvogel Umformtechnik Gmbh Mehrteiliger Kolben für Verbrennungsmotor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB674367A (en) * 1950-02-28 1952-06-25 Napier & Son Ltd Improvements in or relating to fluid cooling of reciprocating pistons
US2855253A (en) * 1955-07-01 1958-10-07 Carrier Corp Fabricated piston
DE2021781A1 (de) * 1970-05-04 1971-11-25 Caterpillar Tractor Co Kolben mit Waermesperreinrichtung
DE2348870A1 (de) * 1973-09-28 1975-04-10 Maschf Augsburg Nuernberg Ag Mehrteiliger kolben fuer brennkraftmaschinen, insbesondere grossdieselmotoren
EP1611975A1 (fr) * 2004-06-30 2006-01-04 KS Kolbenschmidt GmbH Procédé de fabrication d'un piston à canal de refroidissement pour un moteur à combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB674367A (en) * 1950-02-28 1952-06-25 Napier & Son Ltd Improvements in or relating to fluid cooling of reciprocating pistons
US2855253A (en) * 1955-07-01 1958-10-07 Carrier Corp Fabricated piston
DE2021781A1 (de) * 1970-05-04 1971-11-25 Caterpillar Tractor Co Kolben mit Waermesperreinrichtung
DE2348870A1 (de) * 1973-09-28 1975-04-10 Maschf Augsburg Nuernberg Ag Mehrteiliger kolben fuer brennkraftmaschinen, insbesondere grossdieselmotoren
EP1611975A1 (fr) * 2004-06-30 2006-01-04 KS Kolbenschmidt GmbH Procédé de fabrication d'un piston à canal de refroidissement pour un moteur à combustion interne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016204859B3 (de) * 2016-03-23 2017-06-29 Hirschvogel Umformtechnik Gmbh Mehrteiliger Kolben für Verbrennungsmotor

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