EP0757754B1 - Light-metal piston for internal combustion engines - Google Patents
Light-metal piston for internal combustion engines Download PDFInfo
- Publication number
- EP0757754B1 EP0757754B1 EP95913033A EP95913033A EP0757754B1 EP 0757754 B1 EP0757754 B1 EP 0757754B1 EP 95913033 A EP95913033 A EP 95913033A EP 95913033 A EP95913033 A EP 95913033A EP 0757754 B1 EP0757754 B1 EP 0757754B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- shank
- pressure side
- light metal
- decreases
- 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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
- F02F3/022—Pistons having means for accommodating or controlling heat expansion the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval
Definitions
- the invention relates to a light metal piston for internal combustion engines according to the preamble of claim 1.
- the present invention is therefore concerned with the problem to find a piston in a structurally simple manner, in the area of the pressure and / or counter pressure side of the Piston shaft has a uniform load-bearing behavior over the entire Has shaft height.
- the invention is based on a preferred, in the drawing illustrated embodiment explained in more detail, the one piston according to the invention sketchy in perspective View in section shows.
- a light metal piston 1 for an internal combustion engine in particular for a motor vehicle, consists of one piece Piston plate 2 and piston ring groove section 3 Piston head and a piston skirt 4, being on the piston crown 2 attached piston pin hubs 5 for receiving the piston pin serve (not drawn).
- the wall thickness in the load-bearing area e.g. of the Pressure side 6 of the piston skirt 4 executed so that they on the one hand from the lower edge of the shaft 7 or when present a waistband running around the bottom of the shaft from its upper edge continuously over the entire shaft height decreases, the inner shaft contour 8 conical runs, and on the other hand in the piston longitudinal direction lying, going through the pressure 6 counter pressure side 9 Middle plane starting in the circumferential direction on both sides decreases evenly.
- the length L takes from the center plane decreasing in the circumferential direction Wall thickness from the lower edge of the shaft 7 over the shaft height seen from continuously, so that in half-cut of the piston according to the drawing on the inside of the piston skirt 4 a so-called "triangle covenant" Thickening 10 results in the piston skirt continuously 4 passes.
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
Die Erfindung betrifft einen Leichtmetallkolben für Verbrennungsmotoren nach dem Oberbegriff des Anspruchs 1.The invention relates to a light metal piston for internal combustion engines according to the preamble of claim 1.
Bei derartigen aus der Praxis bekannten Leichtmetallkolben ist - um das Tragverhalten des Kolbenschaftes in Druck-Gegendruckrichtung zu verbessern - schon vorgeschlagen worden, im Bereich des offenen Schaftendes auf der Schaftinnenseite einen ringförmig umlaufenden Bund vorzusehen. Eine derartige Verstärkung kann jedoch den heutigen Anforderungen bezüglich des Tragverhaltens des Kolbenschaftes zur Führung des Kolbens nicht genügen, da insbesondere noch in der oberen Schafthälfte eine zu hohe örtliche Steifigkeit vorhanden ist, die eine erhöhte Freßgefahr darstellt.In such light metal pistons known from practice is - the load-bearing behavior of the piston skirt in the pressure-counter pressure direction to improve - has already been proposed in the area of the open shaft end on the inside of the shaft to provide an annular circumferential collar. A However, such reinforcement can meet today's requirements regarding the load-bearing behavior of the piston skirt Guide of the piston is not sufficient, because in particular still too high local stiffness in the upper half of the shaft is present, which represents an increased risk of eating.
Aus US-A-5054375 ist es bekannt, einen derartig ringförmig
umlaufenden Bund etwas oberhalb der offenen Schaftunterkante
vorzusehen.
Ferner ist aus US-A-1885681 bekannt, als Steifmittel für
den Kolbenschaft umlaufende Rippen anzuordnen.From US-A-5054375 it is known to provide such an annular circumferential collar somewhat above the open bottom edge of the shaft.
It is also known from US-A-1885681 to arrange circumferential ribs as stiffening means for the piston skirt.
Vorliegende Erfindung beschäftigt sich daher mit dem Problem, auf konstruktiv einfache Weise einen Kolben zu finden, der im Bereich der Druck- und/oder Gegendruckseite des Kolbenschaftes ein gleichmäßiges Tragverhalten über die gesamte Schafthöhe aufweist.The present invention is therefore concerned with the problem to find a piston in a structurally simple manner, in the area of the pressure and / or counter pressure side of the Piston shaft has a uniform load-bearing behavior over the entire Has shaft height.
Gelöst wird dieses Problem mit einem Leichtmetallkolben mit den Merkmalen nach dem Kennzeichen des Anspruchs 1.This problem is solved with a light alloy piston the features according to the characterizing part of claim 1.
Vorteilhafte Ausgestaltungen nach der Erfindung sind in den Unteransprüchen enthalten.Advantageous embodiments according to the invention are in the Subclaims included.
Die Erfindung ist anhand eines bevorzugten, in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert, das einen erfindungsgemäßen Kolben skizzenhaft in perspektivischer Ansicht im Schnitt zeigt.The invention is based on a preferred, in the drawing illustrated embodiment explained in more detail, the one piston according to the invention sketchy in perspective View in section shows.
Ein Leichtmetallkolben 1 für einen Verbrennungsmotor, insbesondere
für ein Kraftfahrzeug, besteht einstückig aus einem
Kolbenboden 2 und Kolbenringnutenpartie 3 aufweisenden
Kolbenkopf und einem Kolbenschaft 4, wobei an den Kolbenboden
2 angehängte Kolbenbolzennaben 5 zur Aufnahme des Kolbenbolzens
(nicht gezeichnet) dienen.A light metal piston 1 for an internal combustion engine, in particular
for a motor vehicle, consists of one piece
Piston
Um das Führungsverhalten des Leichtmetallkolbens 1 zu verbessern,
d.h. um ein gleichmäßiges Tragbild auf Druck-
und/oder Gegendruckseite des Kolbenschaftes 4 zu erhalten
(in der Zeichnung nur auf einer Kolbenschaftseite dargestellt),
wird die Wanddicke im tragenden Bereich z.B. der
Druckseite 6 des Kolbenschaftes 4 so ausgeführt, daß sie
einerseits von der Schaftunterkante 7 bzw. bei Vorhandensein
eines am unteren Schaftende innen umlaufenden Bundes
von dessen Oberkante her über die gesamte Schafthöhe kontinuierlich
abnimmt, wobei die Schaftinnenkontur 8 konisch
verläuft, und andererseits von der in Kolbenlängsrichtung
liegenden, durch die Druck-6 Gegendruckseite 9 gehenden
Mittelebene ausgehend in Umfangsrichtung nach beiden Seiten
hin gleichmäßig abnimmt. Außerdem nimmt die Länge L der von
der Mittelebene in Umfangsrichtung ausgehend abnehmenden
Wanddicke von der Schaftunterkante 7 her über die Schafthöhe
gesehen kontinuierlich ab, so daß sich im Halbschnitt
des Kolbens gemäß Zeichnung auf der Innenseite des Kolbenschaftes
4 eine als sogenannten "Dreiecksbund" bezeichnete
Verdickung 10 ergibt die kontinuierlich in den Kolbenschaft
4 übergeht. In order to improve the guidance behavior of the light metal piston 1,
i.e. for a uniform contact pattern on print
and / or to obtain the counter pressure side of the piston skirt 4
(shown in the drawing only on one side of the piston skirt),
is the wall thickness in the load-bearing area e.g. of the
Mit einer derartigen Ausführung wird auf konstruktiv einfache Weise ein Leichtmetallkolben geschaffen, bei dem ein gutes Laufverhalten des Kolbens mit einem ausgezeichneten Tragbild auf Druck- und/oder Gegendruckseite des Kolbenschaftes erreicht wird, wodurch auch die Reibleistung und die Geräuschentwicklung vermindert wird.With such a design is structurally simple Way created a light alloy piston in which a good running behavior of the piston with an excellent Contact pattern on the pressure and / or counter pressure side of the piston skirt is achieved, which also reduces the friction and noise is reduced.
Claims (4)
- Light metal piston (1) for internal-combustion engines, consisting of a piston head which receives the piston base (2) and the piston ring groove portion (3) and of a piston shank (4) moulded integrally thereon, characterized in that the wall thickness of the piston shank (4) decreases substantially continuously in the region of the pressure side (6) and/or counter pressure side (9) from the lower edge (7) of the shank or the upper edge of a flange internally encircling the lower shank end over the shank height, the shank internal contour (8) extending substantially conically.
- Light metal piston according to claim 1, characterized in that the wall thickness of the piston shank (4) decreases peripherally towards both sides in the region of the pressure side (6) and/or counter pressure side (9) from the central plane located in the longitudinal direction of the piston and passing through the pressure/counter pressure side.
- Light metal piston according to claim 2, characterized in that the length L of the wall thickness which decreases peripherally from the central plane decreases continuously from the lower edge of the shank (7) or the upper edge of a flange internally encircling the lower shank end, over the shank height.
- Light metal piston according to one of the preceding claims, characterized in that the thickening (10) in the region of the pressure side (6) and/or counter pressure side (9) passes continuously into the piston shank (4) right round.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4414678A DE4414678A1 (en) | 1994-04-27 | 1994-04-27 | Light alloy pistons for internal combustion engines |
DE4414678 | 1994-04-27 | ||
PCT/DE1995/000370 WO1995029332A1 (en) | 1994-04-27 | 1995-03-16 | Light-metal piston for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0757754A1 EP0757754A1 (en) | 1997-02-12 |
EP0757754B1 true EP0757754B1 (en) | 1998-07-01 |
Family
ID=6516563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95913033A Expired - Lifetime EP0757754B1 (en) | 1994-04-27 | 1995-03-16 | Light-metal piston for internal combustion engines |
Country Status (4)
Country | Link |
---|---|
US (1) | US5701803A (en) |
EP (1) | EP0757754B1 (en) |
DE (2) | DE4414678A1 (en) |
WO (1) | WO1995029332A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19733814C2 (en) * | 1996-08-07 | 2001-03-29 | Cummins Engine Co Inc | Engine pistons |
US5839352A (en) * | 1996-08-07 | 1998-11-24 | Cummins Engine Company, Inc. | Articulated piston |
JPH11303674A (en) | 1998-04-24 | 1999-11-02 | Unisia Jecs Corp | Piston for internal combustion engine |
US6209510B1 (en) | 1998-07-28 | 2001-04-03 | Teledyne Technologies Incorporated | Piston and connecting rod assembly |
DE19908670C2 (en) * | 1999-02-27 | 2001-02-22 | Federal Mogul Burscheid Gmbh | Pistons for internal combustion engines |
US7293497B2 (en) | 2005-11-03 | 2007-11-13 | Dresser, Inc. | Piston |
US7302884B2 (en) | 2005-11-03 | 2007-12-04 | Dresser, Inc. | Piston |
DE102007020447A1 (en) * | 2007-04-27 | 2008-10-30 | Mahle International Gmbh | Piston for an internal combustion engine |
DE102009032379A1 (en) * | 2008-08-13 | 2010-02-18 | Mahle International Gmbh | Piston for an internal combustion engine |
JP5543908B2 (en) * | 2010-12-24 | 2014-07-09 | 本田金属技術株式会社 | Piston for engine |
DE102015209591B4 (en) | 2015-05-26 | 2021-03-11 | Federal-Mogul Nürnberg GmbH | Pistons for an internal combustion engine |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB105312A (en) * | 1900-01-01 | |||
US1885681A (en) * | 1930-02-13 | 1932-11-01 | Newton J Buren | Piston construction |
GB509519A (en) * | 1937-05-25 | 1939-07-18 | Hermann Mahle | Improvements in pistons for internal combustion engines |
US2544775A (en) * | 1948-10-27 | 1951-03-13 | Newton J Buren | Piston construction |
US2660492A (en) * | 1951-07-02 | 1953-11-24 | Harold S Lewis | Piston stabilizer |
GB741466A (en) * | 1952-12-03 | 1955-12-07 | Hermann Mahle | Improvements in or relating to pistons for internal combustion engines |
GB867854A (en) * | 1957-12-19 | 1961-05-10 | Hermann Mahle | Light-metal piston |
GB1145873A (en) * | 1966-04-18 | 1969-03-19 | Tatra Np | Improvements in or relating to pistons for internal combustion engines |
US3463057A (en) * | 1967-03-23 | 1969-08-26 | Int Harvester Co | Arrangement of cylinder and piston in engine |
GB1232990A (en) * | 1967-09-28 | 1971-05-26 | ||
US3533329A (en) * | 1968-01-09 | 1970-10-13 | Ercole Galli | Method for manufacturing light alloy pistons with an insert of a different metal,and pistons manufactured thereby |
JPS6198948A (en) * | 1984-10-22 | 1986-05-17 | Toyota Motor Corp | Piston for internal-combustion engine |
DE3625492A1 (en) * | 1986-07-28 | 1988-02-04 | Kloeckner Humboldt Deutz Ag | MULTI-PIECE PISTON FOR AN INTERNAL COMBUSTION ENGINE |
JPH0750049Y2 (en) * | 1986-11-25 | 1995-11-15 | イズミ工業株式会社 | Strut for thermal expansion suppression piston |
DE3840841A1 (en) * | 1988-12-03 | 1990-06-07 | Kolbenschmidt Ag | Light alloy piston for internal combustion engines |
US4907545A (en) * | 1988-12-28 | 1990-03-13 | Caterpillar Inc. | Liquid cooled piston ring carrier assembly and piston using same |
SU1687830A1 (en) * | 1989-04-04 | 1991-10-30 | Тульский Политехнический Институт | Internal combustiom engine piston |
JP2762575B2 (en) * | 1989-06-19 | 1998-06-04 | アイシン精機株式会社 | piston |
GB8927125D0 (en) * | 1989-11-30 | 1990-01-31 | Hepworth & Grandage Ltd | Pistons |
-
1994
- 1994-04-27 DE DE4414678A patent/DE4414678A1/en not_active Withdrawn
-
1995
- 1995-03-16 WO PCT/DE1995/000370 patent/WO1995029332A1/en active IP Right Grant
- 1995-03-16 DE DE59502689T patent/DE59502689D1/en not_active Expired - Fee Related
- 1995-03-16 US US08/737,252 patent/US5701803A/en not_active Expired - Fee Related
- 1995-03-16 EP EP95913033A patent/EP0757754B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59502689D1 (en) | 1998-08-06 |
WO1995029332A1 (en) | 1995-11-02 |
DE4414678A1 (en) | 1995-11-02 |
EP0757754A1 (en) | 1997-02-12 |
US5701803A (en) | 1997-12-30 |
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