EP0697513A1 - Composite piston for internal combustion engine - Google Patents

Composite piston for internal combustion engine Download PDF

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Publication number
EP0697513A1
EP0697513A1 EP95109581A EP95109581A EP0697513A1 EP 0697513 A1 EP0697513 A1 EP 0697513A1 EP 95109581 A EP95109581 A EP 95109581A EP 95109581 A EP95109581 A EP 95109581A EP 0697513 A1 EP0697513 A1 EP 0697513A1
Authority
EP
European Patent Office
Prior art keywords
layer
piston
internal combustion
combustion engine
solid lubricant
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.)
Granted
Application number
EP95109581A
Other languages
German (de)
French (fr)
Other versions
EP0697513B1 (en
Inventor
Kurt Maier
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.)
Mahle GmbH
Original Assignee
Mahle 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 Mahle GmbH filed Critical Mahle GmbH
Publication of EP0697513A1 publication Critical patent/EP0697513A1/en
Application granted granted Critical
Publication of EP0697513B1 publication Critical patent/EP0697513B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a piston built for internal combustion engines with the features according to the preamble of the claim.
  • Such a piston built for internal combustion engines is known from DE-PS 36 33 134.
  • this built piston with a piston body made of light metal and a piston head made of an iron material, which is supported with the end face of an annular support collar arranged on the inside on an annular support rib arranged on the upper side of the lower piston part, and which by means of several parallel to the piston axis in the area the ring rib arranged screws is connected to the lower piston part, the supporting surface of the annular rib of the lower piston part is covered by a thin, smooth and hard layer of a highly wear-resistant material.
  • a layer of highly wear-resistant material is intended to effectively protect the softer base material of the lower piston part from material erosion due to fretting corrosion.
  • Such layers are relatively expensive and the application of the layer, such as. B. in detonation spraying or by electrodeposition is very expensive.
  • the present invention is concerned with the problem of finding a resistant layer in a built-in piston for the bearing surface between the upper and lower piston parts, which layer is particularly simple and environmentally friendly to raise and is relatively cheap.
  • Such a layer is known per se as a running layer for a piston from DE-OS 41 33 546.
  • a running layer which is generally known to be soft and abrasion-resistant, for coating the contact surface of the upper and lower piston parts of a built-up piston from different materials, in order to prevent signs of wear from fretting corrosion.
  • a layer of solid lubricant bonded in hardened resin can be used even at very high surface pressures and short glide paths - the amplitudes of the relative movements between the upper and lower piston parts are less than 1 mm - and offers effective wear protection.
  • An upper piston part 1 with an inner annular rib 2 is connected to a lower piston part 4 via screws 3.
  • the screws 3 engage on the ring rib 2 in threaded blind holes 5.
  • a layer 6 of solid lubricant, such as graphite, bonded in hardened resin is applied, for example, by spraying on the ring-rib-like contact surface 7 of the lower piston part 4.
  • the contact surfaces 8 and 9 can also be coated will.
  • the layer can also be applied by simple brushing or using the screen printing method known per se.
  • the layer has a thickness of between 10 and 30 micrometers, the solid lubricant particles being between 1 and 10 micrometers in size and the proportion of solid lubricant particles being between 30 and 60% by weight.
  • Curable polyimide is to be used as the binder.
  • solvent in the material applied to produce the layer for example by screen printing, which can be, for example, N-methyl-pyrrolidone (NMP).
  • NMP N-methyl-pyrrolidone
  • the proportion of the solvent in the layer starting material to be applied is approximately 50% by weight.
  • the temperature for curing is 150 degrees to 220 degrees Celsius, and curing takes between 10 and 30 minutes.
  • a layer for the bearing surface between the upper and lower parts of the piston is surprisingly found in a built piston, which layer is relatively cheap and can be applied with little effort.

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

Abstract

The internal combustion engine piston includes an upper section (1) made of ferrous material, together with a lower section (4) made of light metal or cast iron. The two sections are joined together via axial screws (3) through gilled flat connecting surfaces (2,7). At least one of the connecting surfaces is covered with a coating layer (6) comprising a solid lubricant such as graphite, bonded in hardened resin. The coating layer has a thickness of between 10 and 30 mm. and may be applied by spraying, painting or screen printing.

Description

Die Erfindung betrifft einen gebauten Kolben für Verbrennungsmotoren mit den Merkmalen nach dem Oberbegriff des Patentanspruchs.The invention relates to a piston built for internal combustion engines with the features according to the preamble of the claim.

Ein derartiger gebauter Kolben für Verbrennungsmotoren ist aus der DE-PS 36 33 134 bekannt. Bei diesem gebauten Kolben mit einem aus Leichtmetall bestehenden Kolbenkörper und einem aus einem Eisenwerkstoff bestehenden Kolbenboden, der sich mit der Stirnfläche eines an seiner Innenseite angeordneten ringförmigen Tragbundes auf einer an der Oberseite des Kolbenunterteils angeordneten ringförmigen Tragrippe abstützt und der mittels mehrerer parallel zur Kolbenachse im Bereich der Ringrippe angeordneter Schrauben mit dem Kolbenunterteil verbunden ist, ist die tragende Fläche der Ringrippe des Kolbenunterteils von einer dünnen, glatten und harten Schicht aus einem hochverschleißfesten Material bedeckt. Durch eine solche Schicht aus hochverschleißfestem Material soll der weichere Grundwerkstoff des Kolbenunterteils wirksam vor einem Materialabtrag durch Reibkorrosion geschützt werden.Such a piston built for internal combustion engines is known from DE-PS 36 33 134. In this built piston with a piston body made of light metal and a piston head made of an iron material, which is supported with the end face of an annular support collar arranged on the inside on an annular support rib arranged on the upper side of the lower piston part, and which by means of several parallel to the piston axis in the area the ring rib arranged screws is connected to the lower piston part, the supporting surface of the annular rib of the lower piston part is covered by a thin, smooth and hard layer of a highly wear-resistant material. Such a layer of highly wear-resistant material is intended to effectively protect the softer base material of the lower piston part from material erosion due to fretting corrosion.

Derartige Schichten sind relativ teuer und das Aufbringen der Schicht, wie z. B. im Detonationsspritzverfahren oder durch galvanische Abscheidung, ist sehr aufwendig.Such layers are relatively expensive and the application of the layer, such as. B. in detonation spraying or by electrodeposition is very expensive.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, bei einem gebauten Kolben für die Auflagefläche zwischen Kolbenober- und Kolbenunterteil eine widerstandsfähige Schicht zu finden, die insbesondere einfach und umweltfreundlich aufzubringen und relativ billig ist.The present invention is concerned with the problem of finding a resistant layer in a built-in piston for the bearing surface between the upper and lower piston parts, which layer is particularly simple and environmentally friendly to raise and is relatively cheap.

Gelöst wird dieses Problem mit einer Schicht mit den Merkmalen nach dem Kennzeichen des Patentanspruchs.This problem is solved with a layer with the features according to the characterizing part of the patent claim.

Eine derartige Schicht ist an sich als Laufschicht für einen Kolben aus der DE-OS 41 33 546 bekannt. Es hat jedoch nicht nahegelegen, eine an sich gemeinhin als weich und abriebfreudig bekannte Laufschicht für eine Beschichtung der Anlagefläche von Kolbenober- und Kolbenunterteil eines gebauten Kolbens aus unterschiedlichen Werkstoffen zu verwenden, um dort Verschleißerscheinungen durch Reibkorrosion zu verhindern. Überraschenderweise wurde nun gefunden, daß eine derartige Schicht aus in ausgehärtetem Harz gebundenem Festschmierstoff auch bei sehr hohen Flächenpressungen und kurzen Gleitwegen - die Amplituden der Relativbewegungen zwischen Kolbenober- und Kolbenunterteil sind kleiner als 1 mm - einsatzfähig ist und wirksamen Verschleißschutz bietet.Such a layer is known per se as a running layer for a piston from DE-OS 41 33 546. However, it was not obvious to use a running layer, which is generally known to be soft and abrasion-resistant, for coating the contact surface of the upper and lower piston parts of a built-up piston from different materials, in order to prevent signs of wear from fretting corrosion. Surprisingly, it has now been found that such a layer of solid lubricant bonded in hardened resin can be used even at very high surface pressures and short glide paths - the amplitudes of the relative movements between the upper and lower piston parts are less than 1 mm - and offers effective wear protection.

Die Erfindung ist nachstehend anhand eines bevorzugten, in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert, das einen erfindungsgemäßen Kolben in Seitenansicht im Schnitt zeigt.The invention is explained below with reference to a preferred embodiment shown in the drawing, which shows a piston according to the invention in side view in section.

Ein Kolbenoberteil 1 mit einer inneren Ringrippe 2 ist über Schrauben 3 mit einem Kolbenunterteil 4 verbunden. Die Schrauben 3 greifen an der Ringrippe 2 jeweils in Gewindesacklochbohrungen 5 ein. Eine Schicht 6 aus in ausgehärtetem Harz gebundenem Festschmierstoff, wie z.B. Graphit, ist beispielsweise durch Spritzen auf der ringrippenartigen Auflagefläche 7 des Kolbenunterteils 4 aufgebracht. Zusätzlich können auch die Kontaktflächen 8 und 9 beschichtet werden.An upper piston part 1 with an inner annular rib 2 is connected to a lower piston part 4 via screws 3. The screws 3 engage on the ring rib 2 in threaded blind holes 5. A layer 6 of solid lubricant, such as graphite, bonded in hardened resin is applied, for example, by spraying on the ring-rib-like contact surface 7 of the lower piston part 4. In addition, the contact surfaces 8 and 9 can also be coated will.

Das Aufbringen der Schicht kann auch durch einfaches Pinseln oder mit dem an sich bekannten Siebdruckverfahren erfolgen.The layer can also be applied by simple brushing or using the screen printing method known per se.

Die Schicht besitzt eine Dicke zwischen 10 und 30 Mymeter, wobei die Festschmierstoff-Partikel in einer Größe zwischen 1 und 10 Mymeter liegen und der Anteil der Festschmierstoff-Partikel zwischen 30 und 60 Gewichts-% betragen soll. Als Bindemittel soll aushärtbares Polyimid verwendet werden.The layer has a thickness of between 10 and 30 micrometers, the solid lubricant particles being between 1 and 10 micrometers in size and the proportion of solid lubricant particles being between 30 and 60% by weight. Curable polyimide is to be used as the binder.

In dem zur Erzeugung der Schicht beispielsweise im Siebdruckverfahren aufgetragenen Material befindet sich ein Lösemittel, das beispielsweise N-Methyl-Pyrrolidon (NMP) sein kann. Der Anteil des Lösemittels im aufzutragenden Schichtausgangsmaterial liegt bei etwa 50 Gewichts-%.There is a solvent in the material applied to produce the layer, for example by screen printing, which can be, for example, N-methyl-pyrrolidone (NMP). The proportion of the solvent in the layer starting material to be applied is approximately 50% by weight.

Die Temperatur für das Aushärten beträgt 150 Grad bis 220 Grad Celsius, und das Aushärten erfolgt in einer Zeit zwischen 10 und 30 Minuten.The temperature for curing is 150 degrees to 220 degrees Celsius, and curing takes between 10 and 30 minutes.

Mit einer derartigen Ausführung wird bei einem gebauten Kolben überraschenderweise eine Schicht für die Auflagefläche zwischen Kolbenober- und Kolbenunterteil gefunden, die relativ billig ist und ohne großen Aufwand aufgebracht werden kann.With an embodiment of this type, a layer for the bearing surface between the upper and lower parts of the piston is surprisingly found in a built piston, which layer is relatively cheap and can be applied with little effort.

Claims (2)

Gebauter Kolben für Verbrennungsmotoren mit einem aus einem Eisenwerkstoff bestehenden Kolbenoberteil und einem aus Leichtmetall oder Gußeisen bestehenden Kolbenunterteil, die über ringrippenartige Auflageflächen aneinander anliegend axial miteinander verschraubt sind, wobei mindestens eine der Auflageflächen mit einer Schicht überzogen ist,
dadurch gekennzeichnet,
daß die Schicht (6) aus in ausgehärtetem Harz gebundenem Festschmierstoff besteht.Built pistons for internal combustion engines with a piston upper part made of an iron material and a piston lower part made of light metal or cast iron, which are screwed axially to one another via ring-rib-like bearing surfaces, at least one of the bearing surfaces being coated with a layer,
characterized by
that the layer (6) consists of solid lubricant bound in hardened resin. Gebauter Kolben nach Anspruch 1,
dadurch gekennzeichnet,
daß als Festschmierstoff Graphit verwendet wird.Built piston according to claim 1,
characterized by
that graphite is used as the solid lubricant.
EP95109581A 1994-08-19 1995-06-21 Composite piston for internal combustion engine Expired - Lifetime EP0697513B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4429489A DE4429489A1 (en) 1994-08-19 1994-08-19 Built pistons for internal combustion engines
DE4429489 1994-08-19

Publications (2)

Publication Number Publication Date
EP0697513A1 true EP0697513A1 (en) 1996-02-21
EP0697513B1 EP0697513B1 (en) 1998-09-23

Family

ID=6526118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95109581A Expired - Lifetime EP0697513B1 (en) 1994-08-19 1995-06-21 Composite piston for internal combustion engine

Country Status (3)

Country Link
EP (1) EP0697513B1 (en)
JP (1) JP3723608B2 (en)
DE (2) DE4429489A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343933A (en) * 1998-11-19 2000-05-24 Wecometal Oy Combustion engine piston
WO2001017695A2 (en) * 1999-09-04 2001-03-15 Federal-Mogul Technology Limited Applying a low friction and low wear coating
DE19943945A1 (en) * 1999-09-14 2001-03-22 Federal Mogul Wiesbaden Gmbh Piston head
WO2005121537A1 (en) * 2004-06-08 2005-12-22 Mahle Gmbh Constructed piston and method for preventing damage to abutting surfaces of the upper and lower sections of said piston
EP2094961A2 (en) * 2006-11-23 2009-09-02 MAHLE International GmbH Two-part piston for an internal combustion engine

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19642109A1 (en) * 1996-10-12 1998-04-16 Mahle Gmbh Built piston
DE19855134A1 (en) * 1998-11-30 2000-05-31 Mahle Gmbh Composite piston has thrust pieces with spherical contact faces located approx. on the level of the hub zenith
DE19910582A1 (en) * 1999-03-10 2000-09-28 Mahle Gmbh Built piston
DE19919725A1 (en) * 1999-04-30 2000-11-02 Mahle Gmbh Piston engine with a cylinder made of light metal
DE10015352C1 (en) * 2000-03-28 2001-07-19 Peter Rong Oil-cooled piston for light-weight i.c. engine, e.g. for light aircraft, has closed cooling space defined between piston base, piston crown and welded piston lower part fitted with base plate
DE10210570A1 (en) * 2002-03-09 2003-09-18 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
CN111102095B (en) * 2019-12-20 2021-05-28 中国北方发动机研究所(天津) Low heat dissipation composite structure piston

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7925700U1 (en) * 1979-09-11 1986-02-06 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen Pistons for an internal combustion engine
US5029562A (en) * 1989-12-05 1991-07-09 Adiabatics, Inc. Hybrid piston for high temperature engine
DE4029315A1 (en) * 1990-09-15 1992-03-19 Mahle Gmbh Attachment of piston crown to its skirt - involves bolts engaging tapped holes with slots near holes to prevent cracks in crown
DE3633134C2 (en) 1986-09-30 1992-07-30 Man B & W Diesel Ag, 8900 Augsburg, De
DE4133546A1 (en) 1991-10-10 1993-04-15 Mahle Gmbh PISTON CYLINDER ARRANGEMENT OF A COMBUSTION ENGINE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3240224A1 (en) * 1982-09-08 1984-03-08 Alcan Aluminiumwerk Nürnberg GmbH, 6000 Frankfurt Piston for internal combustion engines
DE3347292C2 (en) * 1983-12-28 1986-06-19 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Oil-cooled, built-in piston for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7925700U1 (en) * 1979-09-11 1986-02-06 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen Pistons for an internal combustion engine
DE3633134C2 (en) 1986-09-30 1992-07-30 Man B & W Diesel Ag, 8900 Augsburg, De
US5029562A (en) * 1989-12-05 1991-07-09 Adiabatics, Inc. Hybrid piston for high temperature engine
DE4029315A1 (en) * 1990-09-15 1992-03-19 Mahle Gmbh Attachment of piston crown to its skirt - involves bolts engaging tapped holes with slots near holes to prevent cracks in crown
DE4133546A1 (en) 1991-10-10 1993-04-15 Mahle Gmbh PISTON CYLINDER ARRANGEMENT OF A COMBUSTION ENGINE

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2343933A (en) * 1998-11-19 2000-05-24 Wecometal Oy Combustion engine piston
GB2343933B (en) * 1998-11-19 2002-10-09 Wecometal Oy Combustion engine piston
WO2001017695A2 (en) * 1999-09-04 2001-03-15 Federal-Mogul Technology Limited Applying a low friction and low wear coating
WO2001017695A3 (en) * 1999-09-04 2001-11-15 Federal Mogul Technology Ltd Applying a low friction and low wear coating
DE19943945A1 (en) * 1999-09-14 2001-03-22 Federal Mogul Wiesbaden Gmbh Piston head
US6435077B1 (en) 1999-09-14 2002-08-20 Federal-Mogul Wiesbaden Gmbh Piston head
WO2005121537A1 (en) * 2004-06-08 2005-12-22 Mahle Gmbh Constructed piston and method for preventing damage to abutting surfaces of the upper and lower sections of said piston
EP2094961A2 (en) * 2006-11-23 2009-09-02 MAHLE International GmbH Two-part piston for an internal combustion engine

Also Published As

Publication number Publication date
JPH0868358A (en) 1996-03-12
DE59503675D1 (en) 1998-10-29
DE4429489A1 (en) 1996-02-22
JP3723608B2 (en) 2005-12-07
EP0697513B1 (en) 1998-09-23

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