EP0902180B1 - Leichtmetallkolben für Brennkraftmaschinen - Google Patents
Leichtmetallkolben für Brennkraftmaschinen 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
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 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.
Landscapes
- 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
- 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 (8)
- Leichtmetallkolben für Brennkraftmaschinen mit einem dachförmigen Kolbenboden (2) mit zwei gegeneinander geneigten ebenen Kolbenbodenflächen, welche die Dachform bilden, und mit einer Brennraummulde (4), wobei die Naben (14) in Bolzenachsenrichtung (x) derart zurückgesetzt sind, dass der äußere Nabenabstand 60 - 65 % des Kolbendurchmessers (Dk) oder weniger beträgt, und dass jeweils 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) bis wenigstens zu der Ebene (26) der die obere Ringnut begrenzenden Nutoberflanke (28) hineinerstreckt und dessen Tiefe ausgehend von der durch Kolbenbolzenachse und Kolbenlängsachse gebildeten Ebene in Umfangsrichtung nach beiden Seiten hin abnimmt, und wobei 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 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 7, 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 EP0902180A2 (de) | 1999-03-17 |
EP0902180A3 EP0902180A3 (de) | 1999-12-15 |
EP0902180B1 true 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 (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 (ja) * | 2001-02-28 | 2002-11-15 | Honda Motor Co Ltd | 内燃機関 |
DE10145589B4 (de) * | 2001-09-15 | 2006-09-14 | Ks Kolbenschmidt Gmbh | Kolben für eine Brennkraftmaschine |
US6745745B2 (en) | 2002-02-22 | 2004-06-08 | General Motors Corporation | Combustion chamber for reverse tumble spark ignition direct injection engine |
JP2005248949A (ja) * | 2004-02-06 | 2005-09-15 | Yamaha Motor Co Ltd | 内燃機関 |
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 |
DE102013009415A1 (de) * | 2013-06-05 | 2014-12-11 | Man Diesel & Turbo Se | Kolben einer Brennkraftmaschine |
CN108026860A (zh) * | 2015-08-11 | 2018-05-11 | Ks科尔本施密特有限公司 | 用于内燃机的活塞 |
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 (de) * | 1987-07-11 | 1996-12-05 | Eberhard Fezer | Tauchkolben für 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 |
DE4434994C2 (de) * | 1994-09-30 | 1998-02-19 | Porsche Ag | Kolben für Brennkraftmaschinen |
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 DE DE59806259T patent/DE59806259D1/de not_active Expired - Lifetime
- 1998-09-10 EP EP98117145A patent/EP0902180B1/de 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 (de) | 1999-03-18 |
EP0902180A2 (de) | 1999-03-17 |
EP0902180A3 (de) | 1999-12-15 |
DE59806259D1 (de) | 2002-12-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60220925T2 (de) | Einstückiger kolben für dieselmotoren | |
DE69711375T2 (de) | Kolben für eine brennkraftmaschine | |
EP0714479B1 (de) | Kolben für brennkraftmaschinen, insbesondere für dieselmotoren | |
EP0171825B1 (de) | Leichtmetallkolben für Brennkraftmaschinen | |
DE2253868B2 (de) | Einteiliger, mit einer Pleuelstange verbundener Gußeisenkolben | |
DE102007013183A1 (de) | Kühlkanalkolben für eine Brennkraftmaschine | |
EP1483493A1 (de) | Mehrteiliger gekühlter kolben für einen verbrennungsmotor | |
EP0902180B1 (de) | Leichtmetallkolben für Brennkraftmaschinen | |
EP2622195A1 (de) | Brennkraftmaschine mit einem zylindergehäuse aus leichtmetallguss und mit zylinderlaufbuchsen aus rauguss | |
DE19848649C2 (de) | Kohlenstoffkolben für eine Brennkraftmaschine | |
DE19726922A1 (de) | Ausgleichswellen mit minimaler Masse | |
WO2017025608A1 (de) | Kolben für eine brennkraftmaschine | |
DE4010805A1 (de) | Verstaerkter kolben | |
EP2129899A1 (de) | Kolben für einen verbrennungsmotor | |
DE102012008690B4 (de) | Anordnung aus einem Kolben und einem Kolbenbolzen für einen PKW-Dieselmotor | |
WO2010142389A1 (de) | Leichtmetallkolben mit mehrfach-omega-brennraummulde | |
DE10216329A1 (de) | Brennkraftmaschine | |
EP0705968A1 (de) | Kolben für Brennkraftmaschinen | |
DE4441450B4 (de) | Leichtmetallkolben für Brennkraftmaschinen | |
DE19540763C1 (de) | Gehäuse für eine Hubkolben-Brennkraftmaschine | |
DE19908670C2 (de) | Kolben für Brennkraftmaschinen | |
DE60216631T2 (de) | Kolben für verbrennungsmotor | |
DE102009018981A1 (de) | Kolben für eine Hubkolbenmaschine | |
DE102019219378A1 (de) | Zylinderlaufbuchse für eine Brennkraftmaschine | |
DE3243882C2 (de) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
17P | Request for examination filed |
Effective date: 19990917 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
RIC1 | Information provided on ipc code assigned before grant |
Free format text: 6F 02F 3/00 A, 6F 02F 3/26 B |
|
AKX | Designation fees paid |
Free format text: DE FR GB IT |
|
17Q | First examination report despatched |
Effective date: 20010924 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 20021113 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 59806259 Country of ref document: DE Date of ref document: 20021219 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20030221 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20030814 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20060921 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20060922 Year of fee payment: 9 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20070910 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20080531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071001 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070910 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20100922 Year of fee payment: 13 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59806259 Country of ref document: DE Effective date: 20120403 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120403 |