EP0902180A2 - Leichtmetallkolben für Brennkraftmaschinen - Google Patents
Leichtmetallkolben für Brennkraftmaschinen Download PDFInfo
- Publication number
- EP0902180A2 EP0902180A2 EP98117145A EP98117145A EP0902180A2 EP 0902180 A2 EP0902180 A2 EP 0902180A2 EP 98117145 A EP98117145 A EP 98117145A EP 98117145 A EP98117145 A EP 98117145A EP 0902180 A2 EP0902180 A2 EP 0902180A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- light metal
- hubs
- metal piston
- piston 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.)
- Granted
Links
Images
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 one especially asymmetrical Combustion chamber trough.
- Such a piston is known.
- the piston crown faces two flat piston crown surfaces inclined towards each other, the over a common ridge line that runs parallel to the Piston pin axis runs, merge and hereby form the roof shape, so that in Looking at the piston pin direction results in a gable shape.
- Firing bowl shape affects the top heaviness due to the material accumulation in the head area due to the shape of the roof as disadvantageous, in particular 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 the head heaviness 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.
- This task is carried out with a piston of the type mentioned solved according to the invention in that the hubs in Pin axis direction are reset so that the outer hub distance 60 to 65% of the piston diameter or is less, and that above the outer surfaces of the recessed hubs an angle ⁇ in the circumferential direction open cavity enclosing between 45 and 60 ° is provided, which is in the direction of the piston crown extends the area behind the ring field, and that the hub inner surfaces trapezoidal or stepped are offset, and the shaft length 35 to 40% of the piston diameter is.
- the top-heavyness of the piston is reduced.
- the hub will reset radially outside of the Outside surface of the hubs space for the formation of the weight-reducing cavities above the hubs created. It has been shown that through a trapezoidal or step-shaped formation of the Inner hub surfaces due to hub reset deteriorated power transmission to the piston pin can be compensated by at least in the upper Area of the hub a sufficient wing between the hub and bolts is available.
- Hub inner surfaces have proven to be advantageous if this is at an angle of 10 to 15 ° to the The longitudinal axis of the piston is inclined.
- the stretched in the area behind the ring field Cavities preferably extend at least to over the plane of the groove upper flank delimiting the upper ring groove. If the design of the combustion chamber trough permits, the cavity also extends deeper into the piston crown stretch in to the beneficial weight reduction effect even more effectively. It has been shown that at an extension of the cavity in the circumferential direction of less than 60 °, preferably 50-55 °, a weakening or a distortion of the piston crown and the ring field due to tensile and compressive stresses does not adversely notice if the Cavity up to the named level of the top ring groove delimiting groove flank extends.
- One of the roof shapes has proven to be particularly advantageous appropriately optimized design of the cavity proved that the depth of the cavity from the formed by the piston pin axis and the piston longitudinal axis Level in the circumferential direction in both directions decreases, d. H. that the depth of the cavity is analogous to that Roof shape runs and, preferably the slope of the Roof shape correspondingly, decreases towards the sides.
- 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 the tilting movements of the piston impact impulses transmitted to the cylinder wall. Thereby the noise occurring during operation is reduced and it is a reduction in the risk of feeding through reduced Frictional forces on the sliding surfaces even under unfavorable ones Load states in motor operation causes.
- the figures show a light metal piston with a roof-shaped piston head 2 with a combustion chamber trough 4.
- An the piston crown 2 encloses the ring field 6 forming circumferential section 8.
- the one-piece piston comprises two sliding wall sections 10 forming shaft wall sections 12 that form on the section 8 forming the ring field 6 connect and form a total of 14 pin hubs 16 connecting wall sections in FIG Merge circumferentially into one another.
- 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 alloy, preferably with a heat-resistant aluminum alloy especially 11-13% by weight Si, 3.3-4.2% by weight Cu, 1.8- 2.5 wt.% Ni produced.
- a heat-resistant aluminum alloy especially 11-13% by weight Si, 3.3-4.2% by weight Cu, 1.8- 2.5 wt.% Ni produced.
Abstract
Description
- 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.
Claims (10)
- Leichtmetallkolben für Brennkraftmaschinen mit einem dachförmigen Kolbenboden (2) mit einer Brennraummulde (4), dadurch gekennzeichnet, dass die Naben (14) in Bolzenachsenrichtung (x) derart zurückgesetzt sind, dass der äußere Nabenabstand 60 - 65 % des Kolbendurchmessers (Dk) oder weniger beträgt, und dass oberhalb der Außenflächen (18) der zurückgesetzten Naben (14) ein in Umfangsrichtung einen Winkel (α) zwischen 45 und 60° einschließender offener Hohlraum (22) vorgesehen ist, der sich in Richtung auf den Kolbenboden (2) in den Bereich hinter dem Ringfeld (6) hineinerstreckt, und dass die Nabeninnenflächen (20) trapezförmig oder stufenförmig abgesetzt ausgebildet sind, und die Schaftlänge (Ls) 40 - 45 % des Kolbendurchmessers (Dk) beträgt.
- Leichtmetallkolben nach Anspruch 1, dadurch gekennzeichnet, dass die Innenflächen (20) der Naben (14) unter einem Winkel von 10 - 15° zur Kolbenlängsachse geneigt verlaufen.
- Leichtmetallkolben nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich die Hohlräume (22) bis über die Ebene (26) der die obere Ringnut begrenzenden Nutoberflanke (28) erstrecken.
- Leichtmetallkolben nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass die Tiefe der Hohlräume (22) ausgehend von der durch Kolbenbolzenachse und Kolbenlängsachse gebildeten Ebene in Umfangsrichtung nach beiden Richtungen hin abnimmt.
- Leichtmetallkolben nach Anspruch 4, dadurch gekennzeichnet, dass die Tiefe der Hohlräume (22) entsprechend der Neigung der Dachform des Kolbenbodens (2) abnimmt.
- Leichtmetallkolben nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Außenflächen (18) der Naben bündig in den Hohlraum (22) begrenzende Wandflächen (24) übergehen.
- Leichtmetallkolben nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Außenflächen (18) der Naben (14) in Richtung auf den Kolbenboden (2) hinterschneidungsfrei in den Hohlraum (22) begrenzende Wandflächen (24) übergehen.
- Leichtmetallkolben nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass Gleitflächen (10) bildende Abschnitte (12) des Kolbenschafts eine die tribologischen Eigenschaften verbessernde Beschichtung (30) aufweisen.
- Leichtmetallkolben nach einem der vorstehenden Ansprüche dadurch gekennzeichnet, dass er aus einer Aluminiumlegierung mit 11 - 13 Gew.% Si, 3,3 - 4,2 Gew.% Cu und 1,8 - 2,5 Gew.% Ni gegossen ist.
- Leichtmetallkolben nach Anspruch 9, dadurch gekennzeichnet, dass er im Kokillengießverfahren hergestellt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19740065A DE19740065A1 (de) | 1997-09-12 | 1997-09-12 | Leichtmetallkolben für Brennkraftmaschinen |
DE19740065 | 1997-09-12 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0902180A2 true EP0902180A2 (de) | 1999-03-17 |
EP0902180A3 EP0902180A3 (de) | 1999-12-15 |
EP0902180B1 EP0902180B1 (de) | 2002-11-13 |
Family
ID=7842099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98117145A Expired - Lifetime EP0902180B1 (de) | 1997-09-12 | 1998-09-10 | Leichtmetallkolben für Brennkraftmaschinen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0902180B1 (de) |
DE (2) | DE19740065A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1236874A2 (de) * | 2001-02-28 | 2002-09-04 | Honda Giken Kogyo Kabushiki Kaisha | Brennkraftmaschine |
DE10145589A1 (de) * | 2001-09-15 | 2003-04-24 | Ks Kolbenschmidt Gmbh | Kolben für eine Brennkraftmaschine |
EP1338782A1 (de) * | 2002-02-22 | 2003-08-27 | General Motors Corporation | Brennkammer für fremdgezündeten Motor mit Direkteinspritzung und vertikalem Drall |
EP1561938A1 (de) * | 2004-02-06 | 2005-08-10 | Yamaha Hatsudoki Kabushiki Kaisha | Kolben für eine Brennkraftmaschine |
JP2009506259A (ja) * | 2005-08-29 | 2009-02-12 | カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング | 軽量ピストン |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013009415A1 (de) * | 2013-06-05 | 2014-12-11 | Man Diesel & Turbo Se | Kolben einer Brennkraftmaschine |
DE102016114957A1 (de) | 2015-08-11 | 2017-02-16 | Ks Kolbenschmidt Gmbh | Kolben für eine Brennkraftmaschine |
US10865734B2 (en) | 2017-12-06 | 2020-12-15 | Ai Alpine Us Bidco Inc | Piston assembly with offset tight land profile |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2295199A (en) * | 1941-12-27 | 1942-09-08 | Wright Aeronautical Corp | Piston |
DE3723005A1 (de) * | 1987-07-11 | 1989-01-19 | Mahle Gmbh | Tauchkolben fuer verbrennungsmotoren |
DE4110306A1 (de) * | 1990-09-20 | 1992-03-26 | Mahle Gmbh | Tauchkolben aus leichtmetall fuer ottomotoren |
DE4210056A1 (de) * | 1992-03-27 | 1993-09-30 | Mahle Gmbh | Hubkolben eines Verbrennungsmotors |
DE4229071A1 (de) * | 1992-09-01 | 1994-03-03 | Kolbenschmidt Ag | Leichtmetallkolben für Brennkraftmaschinen |
US5562074A (en) * | 1994-09-30 | 1996-10-08 | Dr.Ing. H.C.F. Porsche Ag | Piston for internal-combustion engines |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19510050A1 (de) * | 1995-03-20 | 1996-09-26 | Mahle Gmbh | Leichter, gegossener Kolben für Verbrennungsmotoren |
DE19530631B4 (de) * | 1995-08-21 | 2005-09-22 | Mahle Gmbh | Tauchkolben für Verbrennungsmotoren mit einem geteilten Kolbenbolzen |
DE19537028A1 (de) * | 1995-10-05 | 1997-04-10 | Iav Gmbh | Walzenförmiger Brennraum, vorzugsweise für Dieselmotoren |
-
1997
- 1997-09-12 DE DE19740065A patent/DE19740065A1/de not_active Withdrawn
-
1998
- 1998-09-10 EP EP98117145A patent/EP0902180B1/de not_active Expired - Lifetime
- 1998-09-10 DE DE59806259T patent/DE59806259D1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2295199A (en) * | 1941-12-27 | 1942-09-08 | Wright Aeronautical Corp | Piston |
DE3723005A1 (de) * | 1987-07-11 | 1989-01-19 | Mahle Gmbh | Tauchkolben fuer verbrennungsmotoren |
DE4110306A1 (de) * | 1990-09-20 | 1992-03-26 | Mahle Gmbh | Tauchkolben aus leichtmetall fuer ottomotoren |
DE4210056A1 (de) * | 1992-03-27 | 1993-09-30 | Mahle Gmbh | Hubkolben eines Verbrennungsmotors |
DE4229071A1 (de) * | 1992-09-01 | 1994-03-03 | Kolbenschmidt Ag | Leichtmetallkolben für Brennkraftmaschinen |
US5562074A (en) * | 1994-09-30 | 1996-10-08 | Dr.Ing. H.C.F. Porsche Ag | Piston for internal-combustion engines |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1236874A2 (de) * | 2001-02-28 | 2002-09-04 | Honda Giken Kogyo Kabushiki Kaisha | Brennkraftmaschine |
EP1236874B1 (de) * | 2001-02-28 | 2007-06-06 | Honda Giken Kogyo Kabushiki Kaisha | Brennkraftmaschine |
DE10145589A1 (de) * | 2001-09-15 | 2003-04-24 | Ks Kolbenschmidt Gmbh | Kolben für eine Brennkraftmaschine |
DE10145589B4 (de) * | 2001-09-15 | 2006-09-14 | Ks Kolbenschmidt Gmbh | Kolben für eine Brennkraftmaschine |
EP1338782A1 (de) * | 2002-02-22 | 2003-08-27 | General Motors Corporation | Brennkammer für fremdgezündeten Motor mit Direkteinspritzung und vertikalem Drall |
US6745745B2 (en) | 2002-02-22 | 2004-06-08 | General Motors Corporation | Combustion chamber for reverse tumble spark ignition direct injection engine |
EP1561938A1 (de) * | 2004-02-06 | 2005-08-10 | Yamaha Hatsudoki Kabushiki Kaisha | Kolben für eine Brennkraftmaschine |
JP2009506259A (ja) * | 2005-08-29 | 2009-02-12 | カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング | 軽量ピストン |
Also Published As
Publication number | Publication date |
---|---|
EP0902180A3 (de) | 1999-12-15 |
DE59806259D1 (de) | 2002-12-19 |
DE19740065A1 (de) | 1999-03-18 |
EP0902180B1 (de) | 2002-11-13 |
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