DE2018174A1 - Pistons for internal combustion engines with valve countersinks - Google Patents

Pistons for internal combustion engines with valve countersinks

Info

Publication number
DE2018174A1
DE2018174A1 DE19702018174 DE2018174A DE2018174A1 DE 2018174 A1 DE2018174 A1 DE 2018174A1 DE 19702018174 DE19702018174 DE 19702018174 DE 2018174 A DE2018174 A DE 2018174A DE 2018174 A1 DE2018174 A1 DE 2018174A1
Authority
DE
Germany
Prior art keywords
valve
piston
pistons
internal combustion
combustion engines
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.)
Pending
Application number
DE19702018174
Other languages
German (de)
Inventor
Werner Dr 7012 Schmiden Danneberg Gerhard 7000 Stuttgart P Harting
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE19702018174 priority Critical patent/DE2018174A1/en
Priority to NL717103917A priority patent/NL144366B/en
Priority to FR7113306A priority patent/FR2089693A5/fr
Priority to GB1297484D priority patent/GB1297484A/en
Publication of DE2018174A1 publication Critical patent/DE2018174A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0636—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space having a substantially flat and horizontal bottom
    • F02B23/0639—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space having a substantially flat and horizontal bottom the combustion space having substantially the shape of a cylinder
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • 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
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Daimler-Benz Aktiengesellschaft Palm 86k7/h Daimler-Benz Aktiengesellschaft Palm 86k7 / h

Stuttgart-Untertürkheim 15. April 1970Stuttgart-Untertürkheim April 15, 1970

Kolben für Brennkraftmaschinen mit VentileinsenkungenPistons for internal combustion engines with valve depressions

Die Erfindung bezieht sich auf einen Kolben für Brennkraftmaschinen, insbesondere auf einen geschmiedeten Aluminium-Kolben, der im Kolbenboden mit Ventileinsenkungen versehen ist und eine Brennraununulde aufweist, welche die Ventileinsenkungen überschneidet.The invention relates to a piston for internal combustion engines, especially on a forged aluminum piston, which is in the piston crown is provided with valve depressions and has a combustion chamber trough which overlaps the valve depressions.

Bei Kolben der beschriebenen Art sind an den Überschneidungsstellen der Ventileinsenkungen mit der Brennraununulde scharfe Ecken vorhanden, die parallel zur Mittellängsachse des Kolbens stehen und deren Höhe der Tiefe der Ventileinsenkungen entspricht. Bei hoch belasteten Brennkraftmaschinen mit solchen Kolben wurde nun beobachtet, daß in den Kolben Risse auftreten, die an den Ecken der Ventileinsenkungen beginnen und sich an der Wandung der Brennraummulde entlang in die Tiefe der Brennraummulde erstrecken.Pistons of the type described are at the points of intersection the valve depressions with the burner depression have sharp corners that are parallel to the central longitudinal axis of the piston and their Height corresponds to the depth of the valve depressions. In highly loaded internal combustion engines with such pistons it has now been observed that cracks appear in the pistons at the corners of the valve depressions begin and extend along the wall of the combustion bowl into the depth of the combustion bowl.

Der Erfindung liegt die Aufgabe zugrunde, einen Kolben mit Ventileinsenkungen derart auszubilden, daß solche Risse nicht mehr auftreten. \ The invention is based on the object of designing a piston with valve depressions in such a way that such cracks no longer occur. \

Die gestellte Aufgabe wird erfindungsgemäß in einfacher Weise dadurch gelöst, daß bei jeder Ventileinsenkung an der Überschneidungsetelle der Ventileinsenkung mit der Brennraununulde die Ecken am Kolbenboden entfernt werden. Durch diese ohne besonderen Aufwand durch-According to the invention, the object set is thereby achieved in a simple manner solved that with each valve countersinking at the point of intersection The corners of the piston crown are removed from the valve recess with the burner depression. Through this without any special effort

209808/0743209808/0743

OHlGlNAL INSPECTED OHlGlNAL INSPECTED

- 2 - . Daim 8647A - 2 -. Daim 8647A

-führbare Maßnahme wird der Anlaß zur Rissebildung beseitigt. Die Kolben erfahren eine hohe Lebensdauer.-feasible measure, the cause of crack formation is eliminated. The pistons have a long service life.

In Ausgestaltung des Erfindungsgedankens kann jede Ecke um ein geringes Maß, z.B. um 1 bis 1,5 mm angefast sein und anschließend an diese Anfasung kann unter Anordnung einer Abrundung eine Schräge vorgesehen sein, die sich von der Tiefe der Ventileinsenkung bis zur Oberfläche des Kolbenbodens erstreckt.In an embodiment of the inventive concept, each corner can be around a little Dimension, e.g. beveled by 1 to 1.5 mm and then on this chamfer can be provided with a rounding arrangement, which extends from the depth of the valve recess extends to the surface of the piston crown.

In vorteilhafter Weise kann die Anfasung mi.t Abrundung und Schräge durch ein rotierendes, mit seiner Mittellängsachse parallel zur Mittellängsachse des Kolbens stehendes Werkzeug, z.B. einen Fräser, an den beiden Enden einer Ventileinsenkung gleichzeitig erzeugt sein.Advantageously, the chamfer can be rounded off and beveled by a rotating tool with its central longitudinal axis parallel to the central longitudinal axis of the piston, e.g. a milling cutter, be generated simultaneously at the two ends of a valve recess.

In der Zeichnung ist der Gegenstand der Erfindung in einem Ausführungsbeispiel dargestellt. Es zeigen:In the drawing, the subject of the invention is in one embodiment shown. Show it:

Fig. 1 eine Draufsicht auf einen Kolben,Fig. 1 is a plan view of a piston,

Fig. 2 einen Schnitt durch den Kolben nach der Linie II - II aus Fig. 1 undFIG. 2 shows a section through the piston along the line II-II from FIG. 1 and

Fig. 3 einen Längsschnitt durch den Kolben.3 shows a longitudinal section through the piston.

Bei einem geschmiedeten Aluminium-Kolben 1 ist nach Fig. 1 der Kolbenboden 2 mit vier Ventileinsenkungen 3 versehen, die durch die zentral im Kolbenboden 2 angeordnete Brennraummulde h überschnitten sind.In a forged aluminum piston 1, the piston head 1 is shown in FIG. Provided with four valve recesses 3 2, which are overlapped h through the centrally disposed in the piston crown 2 combustion chamber trough.

Um die an den Überschneidungsstellen gebildeten Ecken zu vermeiden, ist an jeder Überschneidungsstelle eine Anfasung 5 von etwa 1 bis 1,5 mm vorgesehen, die unter einer aus Fig. 2 ersichtlichen Abrundung 6 in eine Schräge 7 übergeht, die sich von der Tiefe der Ventileinsenkung 3 bis zur Oberfläche des Kolbenbodens 2 erstreckt.To avoid the corners formed at the points of intersection, a chamfer 5 of about 1 to 1.5 mm is provided at each point of intersection, which is rounded off under a rounding that can be seen in FIG 6 merges into a slope 7 which extends from the depth of the valve recess 3 to the surface of the piston head 2.

209808/0743209808/0743

- 3 - Daim 86h7/k - 3 - Daim 86h7 / k

Wie in Fig. 1 mit strichpunktierten Linien angedeutet ist, wird die Anfasung 5, die Abrundung 6 und Erzeugung der Schräge 7 durch ein rotierendes Werkzeug 8, z.B. einen Fräser, vorgenommen, dessen Mittellängsachse 9 parallel zur Mittellängsachse 10 des Kolbens steht. "As indicated in Fig. 1 with dash-dotted lines, is the chamfer 5, the rounding 6 and generation of the bevel 7 by a rotating tool 8, for example a milling cutter, made its Central longitudinal axis 9 parallel to central longitudinal axis 10 of the piston stands. "

Fig. 3 zeigt, daß ~ auf die. Wandung der Brennraummulde 4 gesehen, zwischen zwei Ventileinsenkungen 3 ein etwa dachförmiger Verlauf der Schrägen7 gegeben ist.Fig. 3 shows that ~ on the. Wall of the combustion bowl 4 seen, an approximately roof-shaped course of the slopes 7 is given between two valve depressions 3.

2 09808/07 432 09808/07 43

Claims (3)

- h - Palm &6ki/h - h - Palm & 6ki / h Anspruchclaim Kolben für Brennkraftmaschinen, insbesondere geschmiedeter Aluminiuafi-Kolben, der im Kolbenboden mit Ventileinsenkungen versehen ist und eine Brennraumraulde aufweist, welche die Ventileinsenkungen überschneidet,' dadurch gekennzeichnet, daß bei jeder Ventil einsenkung an der Überschneidungsstelle der Ventileinsenkung mit der Brennraummulde die Ecken am Kolbenboden entfernt sind.Pistons for internal combustion engines, especially forged ones Aluminum piston, the piston crown with valve indentations is provided and has a combustion chamber which the Valve depressions overlap, 'characterized in that with each valve depression at the point of intersection the valve recess with the combustion bowl the corners on Piston crown removed. 2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß Ecke uin ein geringes Maß, z.B. 1 bis 1,5 mm angefast ist und anschließend an diese Anfasung unter Anordnung einer Abrundung eine Schräge vorgesehen ist, die sich von der Tiefe der Ventileinsenkung bis zur Oberfläche des Kolbenbodens erstreckt.2. Piston according to claim 1, characterized in that Corner u is chamfered to a small extent, e.g. 1 to 1.5 mm, and then this chamfer is arranged with a Rounding a slope is provided, which extends from the depth of the valve recess to the surface of the piston crown extends. 3. Kolben nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Anfasung mit Abrundung und Schräge durch ein rotierendes, mit seiner Mittellängsachse parallel zur Mittellängeachse des Kolbens stehendes Werkzeug, z.B. einen Präser, an den beiden Ecken einer Ventileinsenkung gleichseitig erzeugt ist.3. Piston according to claims 1 and 2, characterized in that the chamfer with rounding and slope by a rotating, with its central longitudinal axis parallel to the central longitudinal axis of the piston, e.g. a preseeding tool the two corners of a valve recess is produced on the same side. 209808/0743209808/0743 ORIGINAL INSPECTEDORIGINAL INSPECTED
DE19702018174 1970-04-16 1970-04-16 Pistons for internal combustion engines with valve countersinks Pending DE2018174A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19702018174 DE2018174A1 (en) 1970-04-16 1970-04-16 Pistons for internal combustion engines with valve countersinks
NL717103917A NL144366B (en) 1970-04-16 1971-03-24 PISTON FOR COMBUSTION ENGINE.
FR7113306A FR2089693A5 (en) 1970-04-16 1971-04-15
GB1297484D GB1297484A (en) 1970-04-16 1971-04-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702018174 DE2018174A1 (en) 1970-04-16 1970-04-16 Pistons for internal combustion engines with valve countersinks

Publications (1)

Publication Number Publication Date
DE2018174A1 true DE2018174A1 (en) 1972-02-17

Family

ID=5768213

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702018174 Pending DE2018174A1 (en) 1970-04-16 1970-04-16 Pistons for internal combustion engines with valve countersinks

Country Status (4)

Country Link
DE (1) DE2018174A1 (en)
FR (1) FR2089693A5 (en)
GB (1) GB1297484A (en)
NL (1) NL144366B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002027174A1 (en) * 2000-09-20 2002-04-04 Mahle Gmbh Method for rounding off the edge of a recess on a piston

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5735618Y2 (en) * 1977-11-21 1982-08-06
AT402430B (en) * 1992-04-09 1997-05-26 Avl Verbrennungskraft Messtech DIESEL INTERNAL COMBUSTION ENGINE WITH ONE OR MORE ROTATING PISTON
DE19705464A1 (en) * 1997-02-13 1998-08-20 Mahle Gmbh Plunger pistons for internal combustion engines with a combustion bowl
DE102012103212A1 (en) * 2012-04-13 2013-10-17 Mwm Gmbh Piston of an internal combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002027174A1 (en) * 2000-09-20 2002-04-04 Mahle Gmbh Method for rounding off the edge of a recess on a piston
US7185572B2 (en) 2000-09-20 2007-03-06 Mahle Gmbh Method for rounding off the edge of a recess on a piston
KR100819569B1 (en) * 2000-09-20 2008-04-04 말레 게엠베하 Method for rounding off the edge of a recess on a piston
DE10046420B4 (en) * 2000-09-20 2009-05-28 Mahle Gmbh Method of producing a bowl edge rounding

Also Published As

Publication number Publication date
NL144366B (en) 1974-12-16
NL7103917A (en) 1971-10-19
FR2089693A5 (en) 1972-01-07
GB1297484A (en) 1972-11-22

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