EP0902180B1 - Lightweight metal piston for an internal combustion engine - Google Patents
Lightweight metal piston for an internal combustion engine Download PDFInfo
- Publication number
- EP0902180B1 EP0902180B1 EP98117145A EP98117145A EP0902180B1 EP 0902180 B1 EP0902180 B1 EP 0902180B1 EP 98117145 A EP98117145 A EP 98117145A EP 98117145 A EP98117145 A EP 98117145A EP 0902180 B1 EP0902180 B1 EP 0902180B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- light metal
- hubs
- faces
- cavity
- 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.)
- Expired - Lifetime
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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
-
- 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
- F02F3/26—Pistons having combustion chamber in piston head
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Definitions
- the invention relates to a light metal piston for Internal combustion engines with a roof-shaped piston crown a particularly asymmetrical combustion chamber bowl.
- the piston crown has two flat piston crown surfaces inclined towards each other, which over a common ridge line that runs parallel to the piston pin axis runs, merge and thereby the roof shape form, so that viewed in the piston pin direction Gable shape results.
- DE-A-41 10 306 describes a non-roof-shaped piston with a very flat combustion chamber bowl known, the outer Hub distance is 0.4 to 0.7 of the piston diameter, and each above the outer surfaces of the recessed hubs an open cavity is provided which extends towards the piston crown in the area behind the ring field stretched in, and the hub inner surfaces are trapezoidal or are stepped.
- the shaft length is 0.30 - 0.50 on the pressure side of the piston Piston diameter and on the counter pressure side 0.15 - 0.30 des Piston diameter.
- Firing bowl shape affects the top heaviness due to Material accumulation in the head area due to the roof shape as disadvantageous, especially prepares the Piston noise in operation problems and there must be one relatively long shaft length can be used to the To guide pistons in the cylinder and as a result of Evenly absorb head-heavy forces and to be able to derive.
- the object of the invention is to a piston of the type described above improve that the problems mentioned do not occur.
- the top-heavyness of the piston is reduced.
- the Reset of the hubs is done radially outside the outer surface the hub space for training the weight-reducing Cavities created above the hubs. It has shown, that by a trapezoidal or step-like formation of the inner hub surfaces due to the hub reset deteriorated power transmission to the piston pin again can be compensated by at least in the upper range the hub has a sufficient wing between the hub and the bolt is available.
- the cavities extending into the area behind the ring field preferably extend at least to the level of groove upper flank delimiting the upper ring groove. If it is If the combustion chamber trough is allowed to form, the cavity can become also extend deeper into the piston crown to get the to bring about advantageous weight reduction even more effectively. It has been shown that when the cavity extends circumferentially less than 60 °, preferably 50 - 55 °, a weakening or twisting of the piston crown and of the ring field as a result of tensile and compressive stresses not even in a disadvantageous way if the cavity extends up to the named level of the top Extending annular groove flank edge.
- One of the roof shapes has proven to be particularly advantageous appropriately optimized design of the cavity has been proven, after which the depth of the cavity starting from the through Piston pin axis and piston longitudinal axis plane formed in Circumferential direction decreases in both directions, d. H. that the depth of the cavity is analogous to the shape of the roof and, preferably according to the slope of the roof shape Sides decreases.
- In a very particularly preferred embodiment of the Invention go the outer surfaces of the hubs flush in the Wall areas delimiting the cavity. This will be a high coolant exchange during piston operation favors and the manufacture of the piston in the casting process simplified. They go in a particularly advantageous manner Outer surfaces of the hubs towards the piston crown Wall surfaces delimiting the cavity without any undercuts over, whereby the manufacture in the chill casting process under Use of an undercut-free die casting tool is possible.
- Piston shank By improving the tribological properties Coating of sections forming the sliding surfaces Piston shank can be the clearance of the piston in the cylinder be kept small.
- the coating in the form of a Lubricating varnish reduces that due to the tilting movements of the piston the impact pulses transmitted to the cylinder wall. This will the noise occurring during operation is reduced and it becomes a Reduced risk of seizure due to reduced friction the sliding surfaces even under unfavorable load conditions in motor operation causes.
- the figures show a light metal piston with a roof-shaped piston head 2 with a combustion chamber trough 4. At the Piston plate 2 closes a ring field 6 forming Circumferential section 8.
- the one-piece piston comprises two Shaft wall sections 12 which form sliding surfaces 10 and which adhere connect the section 8 forming the ring field 6 and over Bolt hubs 14 forming a total of 16 provided connecting wall sections in the circumferential direction merge.
- the hubs 14 are set back in such a way that the distance of the outer hub surfaces 18 from one another is 65% of the piston diameter D k .
- the inner hub surfaces 20 are trapezoidal, so that the hubs taper in the direction of the free shaft end.
- the hub outer surfaces 18 merge without undercuts and flush into the wall surfaces 24 delimiting the cavities 22.
- the height or depth of the cavities 22 measured in the longitudinal direction of the piston is such that they extend to the plane indicated by reference numeral 26 in FIG. 1, which is defined by the groove flank 28 delimiting the upper annular groove.
- the shaft length L s is 42% of the piston diameter D k .
- the piston is made of a light metal alloy, preferably a heat-resistant aluminum alloy with 11 - 13% by weight Si, 3.3 - 4.2% by weight Cu, 1.8 - 2.5% by weight Ni manufactured. Due to the shape described above the top heaviness of the piston can be provided by the Reduce voids 22 so that it is relatively short Shaft length can be chosen without being distracting Running noises occur or as a result of increased Tilting movements the lateral forces on the cylinder wall and thus the wear is increased. Forming on the sliding surfaces 10 Shaft wall sections 12 is also a tribological one Properties-improving coating 30 applied.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Die Erfindung betrifft einen Leichtmetallkolben für Brennkraftmaschinen mit einem dachförmigen Kolbenboden mit einer insbesondere asymmetrisch ausgebildeten Brennraummulde.The invention relates to a light metal piston for Internal combustion engines with a roof-shaped piston crown a particularly asymmetrical combustion chamber bowl.
Ein derartiger Kolben ist bekannt. Der Kolbenboden weist zwei gegeneinander geneigte ebene Kolbenbodenflächen auf, die über eine gemeinsame Firstlinie, die parallel zur Kolbenbolzenachse verläuft, ineinander übergehen und hierdurch die Dachform bilden, so dass sich in Kolbenbolzenrichtung betrachtet eine Giebelform ergibt. Such a piston is known. The piston crown has two flat piston crown surfaces inclined towards each other, which over a common ridge line that runs parallel to the piston pin axis runs, merge and thereby the roof shape form, so that viewed in the piston pin direction Gable shape results.
Aus DE-A-41 10 306 ist ein nichtdachförmiger Kolben mit einer sehr flachen Brennraummulde bekannt, wobei der äußere Nabenabstand 0,4 bis 0,7 des Kolbendurchmessers beträgt, und jeweils oberhalb der Außenflächen der zurückgesetzten Naben ein offener Hohlraum vorgesehen ist, der sich in Richtung auf den Kolbenboden in den Bereich hinter dem Ringfeld hineinerstreckt, und wobei die Nabeninnenflächen trapezförmig oder stufenförmig abgesetzt ausgebildet sind. Die Schaftlänge beträgt auf der Druckseite des Kolbens 0,30 - 0,50 des Kolbendurchmessers und auf der Gegendruckseite 0,15 - 0,30 des Kolbendurchmessers.DE-A-41 10 306 describes a non-roof-shaped piston with a very flat combustion chamber bowl known, the outer Hub distance is 0.4 to 0.7 of the piston diameter, and each above the outer surfaces of the recessed hubs an open cavity is provided which extends towards the piston crown in the area behind the ring field stretched in, and the hub inner surfaces are trapezoidal or are stepped. The shaft length is 0.30 - 0.50 on the pressure side of the piston Piston diameter and on the counter pressure side 0.15 - 0.30 des Piston diameter.
Aus DE-A-42 10 056 ist ein weiterer nichtdachförmiger Kolben bekannt, wobei der äußere Nabenabstand soweit aus der Zeichnung entnehmbar etwa 55 % des Kolbendurchmessers beträgt, und wobei jeweils oberhalb der Außenflächen der zurückgesetzten Naben ein offener Hohlraum vorgesehen ist, der sich in Richtung auf den Kolbenboden in den Bereich hinter dem Ringfeld bis zu der Ebene der die obere Ringnut begrenzenden Nutoberflanke hineinerstreckt.Another non-roof-shaped piston is known from DE-A-42 10 056 known, the outer hub distance as far from the Removable drawing is about 55% of the piston diameter, and each above the outer surfaces of the recessed hubs an open cavity is provided which towards the piston crown in the area behind the Ring field up to the level of the upper ring groove Grooved upper flank.
Bei dachförmigen Kolben mit einer im Hinblick auf das spezielle Verbrennungsverfahren optimierten Brennraummuldenform wirkt sich die Kopflastigkeit aufgrund der Materialanhäufung im Kopfbereich infolge der Dachform als nachteilig aus, insbesondere bereitet die Kolbengeräuschbildung im Betrieb Probleme, und es muss eine verhältnismäßig lange Schaftlänge verwendet werden, um den Kolben im Zylinder zu führen und die infolge der Kopflastigkeit auftretenden Kräfte gleichmäßig aufnehmen und ableiten zu können.With roof-shaped pistons with a view to that optimized special combustion processes Firing bowl shape affects the top heaviness due to Material accumulation in the head area due to the roof shape as disadvantageous, especially prepares the Piston noise in operation problems and there must be one relatively long shaft length can be used to the To guide pistons in the cylinder and as a result of Evenly absorb head-heavy forces and to be able to derive.
Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, einen Kolben der eingangs beschriebenen Art dahingehend zu verbessern, dass die erwähnten Probleme nicht auftreten.Proceeding from this, the object of the invention is to a piston of the type described above improve that the problems mentioned do not occur.
Diese Aufgabe wird bei einem Kolben der genannten Art erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This task is carried out with a piston of the type mentioned solved according to the invention by the features of claim 1.
Mit den vorstehend genannten Merkmalen wird erfindungsgemäß die Kopflastigkeit des Kolben reduziert. Durch die Zurücksetzung der Naben wird radial außerhalb der Außenfläche der Naben Raum für die Ausbildung der gewichtsreduzierenden Hohlräume oberhalb der Naben geschaffen. Es hat sich gezeigt, dass durch eine trapezförmige oder stufenförmige Ausbildung der Nabeninnenflächen die infolge der Nabenzurücksetzung verschlechterte Kraftübertragung auf den Kolbenbolzen wieder ausgeglichen werden kann, indem zumindest im oberen Bereich der Nabe eine hinreichende Tragfläche zwischen Nabe und Bolzen zur Verfügung steht.With the features mentioned above, the invention the top-heavyness of the piston is reduced. Through the Reset of the hubs is done radially outside the outer surface the hub space for training the weight-reducing Cavities created above the hubs. It has shown, that by a trapezoidal or step-like formation of the inner hub surfaces due to the hub reset deteriorated power transmission to the piston pin again can be compensated by at least in the upper range the hub has a sufficient wing between the hub and the bolt is available.
Es hat sich gezeigt, dass sich ein erfindungsgemäßer Kolben besonders für den Einsatz mit direkter Kraftstoffeinspritzung bei einem Otto-Motor eignet. It has been shown that a piston according to the invention especially for use with direct fuel injection suitable for an Otto engine.
Bei einer trapezförmigen Ausgestaltung der Nabeninnenflächen hat es sich als vorteilhaft erwiesen, wenn diese unter einem Winkel von 10 bis 15° zur Kolbenlängsachse geneigt verlaufen.With a trapezoidal design of the inner hub surfaces it has proven to be advantageous if this under one Angles of 10 to 15 ° to the longitudinal axis of the piston are inclined.
Die in den Bereich hinter dem Ringfeld erstreckten Hohlräume erstrecken sich vorzugsweise wenigstens bis über die Ebene der die obere Ringnut begrenzenden Nutoberflanke. Sofern es die Ausbildung der Brennraummulde zulässt, kann sich der Hohlraum auch tiefer in den Kolbenboden hineinerstrecken, um die vorteilhafte Gewichtsreduzierung noch effektiver zu bewirken. Es hat sich gezeigt, dass bei einer Erstreckung des Hohlraums in Umfangsrichtung von weniger als 60°, vorzugsweise von 50 - 55°, eine Schwächung bzw. eine Verwindung des Kolbenbodens und des Ringfelds infolge auftretender Zug- und Druckspannungen auch dann nicht in nachteiliger Weise bemerkbar macht, wenn sich der Hohlraum bis zu der genannten Ebene der die obere Ringnut begrenzenden Nutflanke erstreckt.The cavities extending into the area behind the ring field preferably extend at least to the level of groove upper flank delimiting the upper ring groove. If it is If the combustion chamber trough is allowed to form, the cavity can become also extend deeper into the piston crown to get the to bring about advantageous weight reduction even more effectively. It has been shown that when the cavity extends circumferentially less than 60 °, preferably 50 - 55 °, a weakening or twisting of the piston crown and of the ring field as a result of tensile and compressive stresses not even in a disadvantageous way if the cavity extends up to the named level of the top Extending annular groove flank edge.
Als ganz besonders vorteilhaft hat sich eine der Dachform entsprechend optimierte Ausgestaltung des Hohlraums erwiesen, wonach die Tiefe des Hohlraums ausgehend von der durch Kolbenbolzenachse und Kolbenlängsachse gebildeten Ebene in Umfangsrichtung nach beiden Richtungen hin abnimmt, d. h. dass die Tiefe des Hohlraums analog der Dachform verläuft und, vorzugsweise der Neigung der Dachform entsprechend, zu den Seiten hin abnimmt. One of the roof shapes has proven to be particularly advantageous appropriately optimized design of the cavity has been proven, after which the depth of the cavity starting from the through Piston pin axis and piston longitudinal axis plane formed in Circumferential direction decreases in both directions, d. H. that the depth of the cavity is analogous to the shape of the roof and, preferably according to the slope of the roof shape Sides decreases.
Bei einer ganz besonders bevorzugten Ausführungsform der Erfindung gehen die Außenflächen der Naben bündig in den Hohlraum begrenzende Wandflächen über. Hierdurch wird ein hoher Kühlmittelaustausch im Betrieb des Kolbens begünstigt und die Herstellung des Kolbens im Gießprozess wird vereinfacht. In ganz besonders vorteilhafter Weise gehen die Außenflächen der Naben in Richtung auf den Kolbenboden hinterschneidungsfrei in den Hohlraum begrenzende Wandflächen über, wodurch die Herstellung im Kokillengießverfahren unter Verwendung eines hinterschneidungsfreien Kokillengießwerkzeugs möglich ist.In a very particularly preferred embodiment of the Invention go the outer surfaces of the hubs flush in the Wall areas delimiting the cavity. This will be a high coolant exchange during piston operation favors and the manufacture of the piston in the casting process simplified. They go in a particularly advantageous manner Outer surfaces of the hubs towards the piston crown Wall surfaces delimiting the cavity without any undercuts over, whereby the manufacture in the chill casting process under Use of an undercut-free die casting tool is possible.
Durch eine die tribologischen Eigenschaften verbessernde Beschichtung von Gleitflächen bildenden Abschnitten des Kolbenschafts kann das Einbauspiel des Kolbens im Zylinder klein gehalten werden. Die Beschichtung in Form eines Gleitlacks vermindert die durch Kippbewegungen des Kolbens an die Zylinderwand übertragenen Aufschlagimpulse. Dadurch wird das im Betrieb auftretende Geräusch reduziert und es wird eine Verminderung der Fressgefahr durch herabgesetzte Reibkräfte an den Gleitflächen auch unter ungünstigen Lastzuständen im motorischen Betrieb bewirkt.By improving the tribological properties Coating of sections forming the sliding surfaces Piston shank can be the clearance of the piston in the cylinder be kept small. The coating in the form of a Lubricating varnish reduces that due to the tilting movements of the piston the impact pulses transmitted to the cylinder wall. This will the noise occurring during operation is reduced and it becomes a Reduced risk of seizure due to reduced friction the sliding surfaces even under unfavorable load conditions in motor operation causes.
Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Ansprüchen und der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform des erfindungsgemäßen Kolbens.
- Figur 1
- zeigt einen Längsschnitt durch die von Kolbenlängsachse und Kolbenbolzenachse gebildete Ebene; und
Figur 2- zeigt eine Ansicht auf die Ebene II-II in Figur 1; und
- Figur 3
- eine Seitenansicht des Kolbens in Richtung der Kolbenbolzenachse.
- Figure 1
- shows a longitudinal section through the plane formed by the longitudinal piston axis and piston pin axis; and
- Figure 2
- shows a view of the plane II-II in Figure 1; and
- Figure 3
- a side view of the piston in the direction of the piston pin axis.
Die Figuren zeigen einen Leichtmetallkolben mit einem
dachförmigen Kolbenboden 2 mit einer Brennraummulde 4. An den
Kolbenboden 2 schließt sich ein das Ringfeld 6 bildender
Umfangsabschnitt 8 an. Der einteilige Kolben umfasst zwei
Gleitflächen 10 bildende Schaftwandabschnitte 12, die sich an
den das Ringfeld 6 bildenden Abschnitt 8 anschließen und über
Bolzennaben 14 bildende insgesamt mit dem Bezugszeichen 16
versehene Verbindungswandabschnitte in Umfangsrichtung
ineinander übergehen.The figures show a light metal piston with a
roof-
Die Naben 14 sind derart zurückgesetzt, dass der Abstand der
Nabenaußenflächen 18 voneinander 65 % des Kolbendurchmessers Dk
aufweist. Wie aus der Figur 1 ersichtlich verlaufen die
Nabeninnenflächen 20 trapezförmig, so dass sich die Naben in
Richtung auf das freie Schaftende verjüngen. Durch die
Zurücksetzung der Naben 14 bzw. der Nabenaußenflächen 18
entstehen in Umfangsrichtung auf Breite der Naben und
senkrecht zur Kolbenbolzenachse x Freiräume für die Ausbildung
eines im Wesentlichen senkrecht zur Kolbenbolzenachse x in
Richtung auf den Kolbenboden 2 erstreckten Hohlraums 22. Die
Hohlräume 22 überspannen in Umfangsrichtung ein
Kreisbogensegment von 55°. Sie sind zur Kolbenbolzenlängsachse
x symmetrisch ausgebildet. Die Nabenaußenflächen 18 gehen
hinterschneidungsfrei und bündig in die Hohlräume 22
begrenzende Wandflächen 24 über. Die Höhe bzw. Tiefe der
Hohlräume 22 in Kolbenlängsrichtung gemessen ist derart, dass
sie sich bis zu der mit dem Bezugszeichen 26 in der Figur 1
angedeuteten Ebene erstrecken, welche durch die die obere
Ringnut begrenzende Nutflanke 28 definiert ist.The
Die Schaftlänge Ls beträgt 42 % des Kolbendurchmessers Dk.The shaft length L s is 42% of the piston diameter D k .
Der Kolben ist aus einer Leichtmetalllegierung, vorzugsweise
einer hochwarmfesten Aluminiumlegierung mit insbesondere 11 -
13 Gew.% Si, 3,3 - 4,2 Gew.% Cu, 1,8 - 2,5 Gew.% Ni
hergestellt. Durch die vorstehend beschriebene Formgebung
lässt sich die Kopflastigkeit des Kolbens durch Vorsehen der
Hohlräume 22 reduzieren, so dass eine verhältnismäßig kurze
Schaftlänge gewählt werden kann, ohne dass störende
Laufgeräusche auftreten oder infolge verstärkter
Kippbewegungen die Seitenkräfte auf die Zylinderwand und damit
der Verschleiß erhöht wird. Auf die Geitflächen 10 bildenden
Schaftwandabschnitte 12 ist zusätzlich eine die tribologischen
Eigenschaften verbessernde Beschichtung 30 aufgebracht.The piston is made of a light metal alloy, preferably
a heat-resistant aluminum alloy with 11 -
13% by weight Si, 3.3 - 4.2% by weight Cu, 1.8 - 2.5% by weight Ni
manufactured. Due to the shape described above
the top heaviness of the piston can be provided by the
Claims (8)
- Light metal piston for internal-combustion engines with a roof-shaped piston head (2) with two flat piston head faces inclined toward one another and forming the roof shape, and with a combustion chamber hollow (4), wherein the hubs (14) are set back in the pin axis direction (x) in such a way that the outer hub spacing is 60 to 65% of the piston diameter (Dk) or less and in that above the respective outer faces (18) of the set-back hubs (14) an open cavity (22) enclosing an angle (α) between 45 and 60° in the peripheral direction is provided, extending in the direction of the piston head (2) into the region behind the annular field (6) at least up to the plane (26) of the upper groove flank (28) delimiting the upper annular groove, and the depth of the cavity (22) starting from the plane formed by the piston pin axis and longitudinal axis of the piston decreases in the peripheral direction to both sides and wherein the internal faces of the hubs (20) are designed to be trapezoidal or offset in a step-like manner and the shaft length (Ls) amounts to 40 to 45% of the piston diameter (Dk).
- Light metal piston according to claim 1, characterised in that the internal faces (20) of the hubs (14) extend inclined at an angle of 10 to 15° to the longitudinal axis of the piston.
- Light metal piston according to claim 1 or 2, characterised in that the depth of the cavities (22) decreases according to the inclination of the roof shape of the piston head (2).
- Light metal piston according to any one of the preceding claims, characterised in that the external faces (18) of the hubs pass flush into the wall faces (24) delimiting the cavity (22).
- Light metal piston according to any one of the preceding claims, characterised in that the external faces (18) of the hubs (14) pass without an undercut into the wall faces (24) delimiting the cavity (22) in the direction of the piston head (2).
- Light metal piston according to any one of the preceding claims, characterised in that portions (12) of the piston shaft forming sliding faces (10) have a coating (30) improving the tribological characteristics.
- Light metal piston according to any one of the preceding claims, characterised in that it is cast from an aluminium alloy with 11 to 13% by weight Si, 3.3 to 4.2% by weight Cu and 1.8 to 2.5% by weight Ni.
- Light metal piston according to claim 7, characterised in that it is produced by the chill casting method.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19740065A DE19740065A1 (en) | 1997-09-12 | 1997-09-12 | Light alloy pistons for internal combustion engines |
| DE19740065 | 1997-09-12 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0902180A2 EP0902180A2 (en) | 1999-03-17 |
| EP0902180A3 EP0902180A3 (en) | 1999-12-15 |
| EP0902180B1 true EP0902180B1 (en) | 2002-11-13 |
Family
ID=7842099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98117145A Expired - Lifetime EP0902180B1 (en) | 1997-09-12 | 1998-09-10 | Lightweight metal piston for an internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0902180B1 (en) |
| DE (2) | DE19740065A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10865734B2 (en) | 2017-12-06 | 2020-12-15 | Ai Alpine Us Bidco Inc | Piston assembly with offset tight land profile |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002327624A (en) * | 2001-02-28 | 2002-11-15 | Honda Motor Co Ltd | Internal combustion engine |
| DE10145589B4 (en) * | 2001-09-15 | 2006-09-14 | Ks Kolbenschmidt Gmbh | Piston for an internal combustion engine |
| US6745745B2 (en) * | 2002-02-22 | 2004-06-08 | General Motors Corporation | Combustion chamber for reverse tumble spark ignition direct injection engine |
| JP2005248949A (en) * | 2004-02-06 | 2005-09-15 | Yamaha Motor Co Ltd | Internal combustion engine |
| KR20080063269A (en) * | 2005-08-29 | 2008-07-03 | 카에스 콜벤슈미트 게엠베하 | Lightweight piston |
| DE102013009415A1 (en) * | 2013-06-05 | 2014-12-11 | Man Diesel & Turbo Se | Piston of an internal combustion engine |
| WO2017025608A1 (en) | 2015-08-11 | 2017-02-16 | Ks Kolbenschmidt Gmbh | Piston for an internal combustion engine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2295199A (en) * | 1941-12-27 | 1942-09-08 | Wright Aeronautical Corp | Piston |
| DE3723005C2 (en) * | 1987-07-11 | 1996-12-05 | Eberhard Fezer | Plunger pistons for internal combustion engines |
| DE4110306A1 (en) * | 1990-09-20 | 1992-03-26 | Mahle Gmbh | SUBMERSIBLE ALLOY PISTON FOR OTTO ENGINES |
| DE4210056A1 (en) * | 1992-03-27 | 1993-09-30 | Mahle Gmbh | Reciprocating piston of an internal combustion engine |
| DE4229071A1 (en) * | 1992-09-01 | 1994-03-03 | Kolbenschmidt Ag | Light alloy piston, for internal combustion engines - comprises insert made of pressed, sintered chips of metallic material |
| DE4434994C2 (en) * | 1994-09-30 | 1998-02-19 | Porsche Ag | Pistons for internal combustion engines |
| DE19510050A1 (en) * | 1995-03-20 | 1996-09-26 | Mahle Gmbh | Lightweight, cast piston for IC engine |
| DE19530631B4 (en) * | 1995-08-21 | 2005-09-22 | Mahle Gmbh | Piston for internal combustion engines with a split piston pin |
| DE19537028A1 (en) * | 1995-10-05 | 1997-04-10 | Iav Gmbh | Roll-shaped combustion cavity for diesel engine |
-
1997
- 1997-09-12 DE DE19740065A patent/DE19740065A1/en not_active Withdrawn
-
1998
- 1998-09-10 DE DE59806259T patent/DE59806259D1/en not_active Expired - Lifetime
- 1998-09-10 EP EP98117145A patent/EP0902180B1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10865734B2 (en) | 2017-12-06 | 2020-12-15 | Ai Alpine Us Bidco Inc | Piston assembly with offset tight land profile |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19740065A1 (en) | 1999-03-18 |
| DE59806259D1 (en) | 2002-12-19 |
| EP0902180A3 (en) | 1999-12-15 |
| EP0902180A2 (en) | 1999-03-17 |
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