DE4131275C2 - Built liquid-cooled piston - Google Patents

Built liquid-cooled piston

Info

Publication number
DE4131275C2
DE4131275C2 DE4131275A DE4131275A DE4131275C2 DE 4131275 C2 DE4131275 C2 DE 4131275C2 DE 4131275 A DE4131275 A DE 4131275A DE 4131275 A DE4131275 A DE 4131275A DE 4131275 C2 DE4131275 C2 DE 4131275C2
Authority
DE
Germany
Prior art keywords
head
piston
shaft
screw
expansion screw
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
Application number
DE4131275A
Other languages
German (de)
Other versions
DE4131275A1 (en
Inventor
Dieter Mesmer
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.)
Mahle GmbH
Original Assignee
Mahle GmbH
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 Mahle GmbH filed Critical Mahle GmbH
Priority to DE4131275A priority Critical patent/DE4131275C2/en
Priority to FR9211183A priority patent/FR2681643B1/en
Publication of DE4131275A1 publication Critical patent/DE4131275A1/en
Application granted granted Critical
Publication of DE4131275C2 publication Critical patent/DE4131275C2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • 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
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel
    • 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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Die Erfindung betrifft einen gebauten flüssigkeitsge­ kühlten Kolben nach dem Oberbegriff des Patentan­ spruchs 1.The invention relates to a built liquid cooled pistons according to the preamble of the patent saying 1.

Ein solcher Kolben ist aus DE 32 49 290 T1 bekannt. Dieser ist im Bereich der Zentralverschraubung so ausgebildet, daß Festigkeitsprobleme zu erwarten sind.Such a piston is known from DE 32 49 290 T1. This is so in the area of the central screw connection trained to expect strength problems are.

Bekannt ist außerdem aus der DE 37 19 469 A1 ein gat­ tungsgemäßer Kolben mit einem Federpaket, gegen das sich der Schraubenkopf der Zentralverschraubung ab­ stützt. Bekannt ist weiterhin aus der DE 29 14 456 A1 ein - nicht flüssigkeitsgekühlter - gebauter Kolben mit Zentralverschraubung, der ebenfalls im Bereich der Anlage des Schraubenkopfes eine festigkeitsmäßig ungünstige Ausbildung aufweist.A gat is also known from DE 37 19 469 A1 proper piston with a spring assembly against which the screw head of the central screw connection supports. It is also known from DE 29 14 456 A1 a - not liquid-cooled - built piston with central screw connection, which is also in the area the installation of the screw head a strength has unfavorable training.

Der Erfindung liegt die Aufgabe zugrunde, bei gattungsgemäßen Kolben die Dauerfestigkeit der Zentralverschraubung zu verbessern.The invention is based on the object in the case of generic pistons, the fatigue strength of the Central screw to improve.

Gelöst wird diese Aufgabe durch eine Ausbildung der Zentralverschraubung nach den kennzeichnenden Merkma­ len des Patentanspruchs 1.This task is solved by training the Central screw connection according to the characteristic len of claim 1.

Dabei ist unter dem Kol­ benkopfschwerkreis der gedachte Kreisdurchmesser zu verstehen, der die in die Ebene projizierte Fläche des Kolbenbodens so in eine innere Kreisfläche und eine äußere Kreisringfläche unterteilt, daß beide Flächen gleich groß sind. Das Durchmesserverhältnis von Kreisring zu Kreis liegt dann bei 1,414.It is under the col  benkopfschwerkreis the imaginary circle diameter understand the area projected into the plane the piston crown into an inner circular area and an outer annulus divides that both Areas are the same size. The diameter ratio from ring to circle is then 1.414.

Zweckmäßige Ausgestaltungen sind Gegenstand der Un­ teransprüche.Appropriate configurations are the subject of the Un claims.

Der wesentliche Vorteil der erfindungsgemäßen Lösung besteht darin, daß die Dehnschraube sich innerhalb des Schaftes an einem Schaftbereich abstützt, der nicht an der Gaskraftübertragung vom Kolbenkopf zu den Naben des Schaftes beteiligt ist. Dadurch ist die Dehnschraube einer geringen Wechsellast im Motorbe­ trieb unterworfen. Dies bedeutet wiederum, daß auf eine Federvorspannung, wie in der Ausführung nach der DE 37 19 469 A1 über Tellerfedern, verzichtet werden kann. Dies ist für die Dauerfestigkeit der Schraub­ verbindung insofern von Bedeutung Hals Tellerfedern unter der im Motorbetrieb herrschenden Temperatur ih­ re Spannkraft allmählich abbauen.The main advantage of the solution according to the invention is that the expansion screw is inside of the shaft is supported on a shaft area which not at the gas power transmission from the piston head too the hubs of the shaft is involved. This is the Expansion screw of a small alternating load in the engine urged subject. This in turn means that on a spring preload, as in the version after the  DE 37 19 469 A1 on disc springs can be dispensed with can. This is for the fatigue strength of the screw connection insofar important neck disc springs under the temperature prevailing in engine operation ih Gradually reduce the tension.

Ein Ausführungsbeispiel ist in der Zeichnung, die ei­ nen gebauten Kolben im Längsschnitt zeigt, darge­ stellt.An embodiment is in the drawing, the egg NEN built piston shows in longitudinal section, Darge poses.

Der gebaute Kolben besteht aus einem mit Ringnuten versehenen Kolbenkopf 1 aus einem festigkeitsmäßig hoch belastbaren Material, wie beispielsweise Stahl, und aus einem Kolbenschaft 2 aus beispielsweise Sphä­ roguß. Die Verbindung von Kolbenkopf 1 und Kolben­ schaft 2 erfolgt mittels einer zentral angeordneten Dehnschraube 3, die an ihrem einen Ende mit einem Ge­ winde versehen ist, das in dem Kolbenkopf 1 ein­ greift. An ihrem anderen Ende ist die Dehnschraube 3 mit einem Schraubenkopf versehen, über den sie sich an dem Kolbenschaft über eine zwischengeschaltete Hülse 4 abstützt.The piston built consists of a piston head 1 provided with annular grooves made of a material with a high strength, such as steel, and a piston skirt 2 made of, for example, spheroidal cast iron. The connection of piston head 1 and piston shaft 2 is carried out by means of a centrally arranged expansion screw 3 , which is provided at one end with a Ge thread that engages in the piston head 1 . At its other end, the expansion screw 3 is provided with a screw head, by means of which it is supported on the piston shaft via an intermediate sleeve 4 .

Die auf dem Kolbenkopf 1 einwirkenden Zündkräfte überträgt der Kolbenkopf 1 über einen radial inneren und einen radial äußeren Ringbereich 5 bzw. 6 auf den Kolbenschaft. Der innere Ringbereich 5 ist die dem Kolbenkopf zugewandte Auflagefläche eines hohlkegel­ förmigen Stützringes 7, der sich in Richtung des Schaftendes hin durchmessermäßig erweitert. Durch den Stützring 7 gelangen die von diesem übertragenen Gaskräfte direkt auf die Naben des Schaftes 2. The ignition forces acting on the piston head 1 are transferred to the piston skirt 1 via a radially inner and a radially outer ring region 5 or 6 . The inner ring area 5 is the bearing surface facing the piston head of a hollow cone-shaped support ring 7 , which widens in diameter in the direction of the shaft end. Through the support ring 7 , the gas forces transmitted from it reach the hubs of the shaft 2 .

Im Bereich der Ringfläche 5 ist ein Kragen 8 nach ra­ dial innen an den Stützring 7 angeformt. Dieser Stützring 8 bildet radial innen das Auflager für die Hülse 4, die von der Dehnschraube 3 verspannt wird. Der Kragen 8 besitzt eine Hohlkegelform mit sich zum Kopf der Dehnschraube 3 hin verkleinerndem Durchmes­ ser. Der Kragen 8 liegt außerhalb des die Gaskräfte innerhalb des Stützringes 7 bewirkenden Kraftflusses.In the area of the annular surface 5 , a collar 8 is integrally formed on the support ring 7 after ra dial. This support ring 8 forms the radially inner support for the sleeve 4 , which is clamped by the expansion screw 3 . The collar 8 has a hollow cone shape with diminishing diameter to the head of the expansion screw 3 . The collar 8 lies outside the force flow which causes the gas forces within the support ring 7 .

Das Kühlöl wird von den Nabenbohrungen aus in den äu­ ßeren Kühlringkanal 10 eingeführt, von dem es durch Überlauföffnungen 11 in den zentralen Kühlraum 12 ge­ langt, den es über radiale Abflußbohrungen 13 inner­ halb der Hülse 4 verlassen kann.The cooling oil is introduced from the hub bores into the outer cooling ring channel 10 , from which it reaches ge through overflow openings 11 in the central cooling space 12 , which it can leave via half half of the sleeve 4 via radial drain holes 13 .

Claims (5)

1. Gebauter flüssigkeitsgekühlter Kolben für Verbrennungs­ motoren, bestehend aus einem die Kolbenringe aufnehmen­ den Kolbenkopf und einem Kolbenschaft, die durch eine Zentralverschraubung miteinander verbunden sind, bei dem der Kopf und der Schaft auf einem inneren radial innerhalb und einem äußeren radial außerhalb des Kol­ benkopfschwerkreises liegenden Ringbereich aufeinander­ liegen, bei dem ferner in dem Bereich radial zwischen diesen ringförmigen Auflagen ein an beide Teile angren­ zender Kühlölringkanal vorgesehen ist, der durch den Abstützungsbereich hindurch mit einem zentralen sich zwischen Kopf und Schaft erstreckenden Kühlraum verbun­ den ist, wobei der zentrale Kühlraum einen zum Kurbel­ raum führenden Abfluß besitzt und bei dem die Zentral­ verschraubung aus einer Dehnschraube besteht, die auf den Kolbenkopf im Motorbetrieb wirkende Massenkräfte aufnimmt und die mit ihrem einen ein Gewinde aufweisen­ den Ende in den Kolbenkopf eingreift, während sie sich mit dem sich an ihrem zweiten Ende befindlichen Schrau­ benkopf an dem Schaft abstützt, gekennzeichnet durch die Merkmale
  • a) die über die innere Abstützungsringfläche (5) von dem Kopf (1) in den Schaft (2) eingeleite­ ten Gaskräfte werden innerhalb des Schaftes (2) über einen hohlkegelförmigen sich zum un­ teren Schaftende hin erweiternden Stützring (7) auf die Naben des Schaftes (2) übertragen,
  • b) radial innerhalb des Hohlkegel-Stützringes (7) ist ein von der Gaskraftaufnahme abgekoppelter Kragen (8) zur Abstützung der Dehnschraube (3) angeformt,
  • c) der Kragen (8) besitzt eine Hohlkegelform mit sich zum Kopf der Dehnschraube (3) hin ver­ kleinerndem Durchmesser.
1.Built liquid-cooled piston for internal combustion engines, consisting of a the piston rings receive the piston head and a piston skirt, which are connected by a central screw connection, in which the head and the shaft lie on an inner radially inside and an outer radially outside the Kolenkenkschscherkreises Ring area lie one on top of the other, in which in the area radially between these annular supports a cooling oil ring channel adjoining both parts is provided, which is connected through the support area with a central cooling space extending between the head and the shaft, the central cooling space one for Crank space-leading drain and in which the central screw consists of an expansion screw which absorbs inertial forces acting on the piston head in engine operation and which have a threaded end that engages in the piston head while it engages with the is located at its second end screw head on the shaft, characterized by the features
  • a) over the inner support ring surface ( 5 ) from the head ( 1 ) in the shaft ( 2 ) introduced gas forces within the shaft ( 2 ) via a hollow cone-shaped to the lower shaft end expanding ring ( 7 ) on the hubs of Shaft ( 2 ) transferred,
  • b) a collar ( 8 ), decoupled from the gas force absorption, is formed radially inside the hollow cone support ring ( 7 ) to support the expansion screw ( 3 ),
  • c) the collar ( 8 ) has a hollow cone shape with the head of the expansion screw ( 3 ) ver reducing diameter.
2. Kolben nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Kopf der Dehnschraube (3) und dem Kra­ gen (8) eine Hülse (4) eingesetzt ist.2. Piston according to claim 1, characterized in that between the head of the expansion screw ( 3 ) and the Kra gene ( 8 ), a sleeve ( 4 ) is inserted. 3. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Hülse (4) mit mindestens einer den Abfluß aus dem inneren Kühlraum (12) bildenden radialen Bohrung (13) versehen ist.3. Piston according to one of the preceding claims, characterized in that the sleeve ( 4 ) is provided with at least one outflow from the inner cooling space ( 12 ) forming radial bore ( 13 ). 4. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sich der innere Abstütz-Ringbereich (5) zwischen etwa 0,1 und 0,7 des Durchmessers des Kolbenkopfes (1) erstreckt.4. Piston according to one of the preceding claims, characterized in that the inner support ring region ( 5 ) extends between about 0.1 and 0.7 of the diameter of the piston head ( 1 ). 5. Kolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die zwischen dem Kopf und dem Gewinde der Dehn­ schraube (3) befindliche Dehnlänge der Dehnschraube (3) zwischen etwa 10 und 30% des Kolbenkopfdurchmessers beträgt.5. Piston according to one of the preceding claims, characterized in that between the head and the thread of the expansion screw ( 3 ) located expansion length of the expansion screw ( 3 ) is between about 10 and 30% of the piston head diameter.
DE4131275A 1991-09-20 1991-09-20 Built liquid-cooled piston Expired - Lifetime DE4131275C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4131275A DE4131275C2 (en) 1991-09-20 1991-09-20 Built liquid-cooled piston
FR9211183A FR2681643B1 (en) 1991-09-20 1992-09-18 PISTON IN SEVERAL PARTS, COOLED BY A LIQUID.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4131275A DE4131275C2 (en) 1991-09-20 1991-09-20 Built liquid-cooled piston

Publications (2)

Publication Number Publication Date
DE4131275A1 DE4131275A1 (en) 1993-03-25
DE4131275C2 true DE4131275C2 (en) 1998-04-09

Family

ID=6441037

Family Applications (1)

Application Number Title Priority Date Filing Date
DE4131275A Expired - Lifetime DE4131275C2 (en) 1991-09-20 1991-09-20 Built liquid-cooled piston

Country Status (2)

Country Link
DE (1) DE4131275C2 (en)
FR (1) FR2681643B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004851A1 (en) 2001-07-06 2003-01-16 A.I.M.L. Gmbh Coolable annular support for internally cooled piston rings and method for the production thereof
DE102004027974A1 (en) * 2004-06-08 2005-12-29 Mahle Gmbh A built piston and method of preventing damage in contact surfaces of the top and bottom of the piston
DE102005061899A1 (en) * 2005-12-23 2007-06-28 Mahle International Gmbh Multipart piston for an internal combustion engine has upper and lower piston parts, a threaded head, a support plate with a plate body and a threaded body
DE102006027354A1 (en) * 2006-06-13 2007-12-20 Mahle International Gmbh Multi-piece cooled piston for an internal combustion engine

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416120A1 (en) * 1994-05-06 1995-11-09 Mahle Gmbh Two or more part IC engine piston held together by three bolts
FI102559B1 (en) * 1995-03-09 1998-12-31 Waertsilae Nsd Oy Ab Internal combustion engine piston unit
DE10022035A1 (en) * 2000-05-05 2001-11-08 Mahle Gmbh Internal combustion engine with built piston; has piston with base and lower part connected by screw having device in head to transfer oil from connecting rod to cooling chamber in piston
DE10061491C1 (en) 2000-12-09 2002-04-18 Porsche Ag Towing attachment for motor vehicle has cross member ends rigidly connected to respective mounting, with mountings and cross member fastened as assembly to body part of vehicle by longitudinally extending waisted bolts
DE10257022A1 (en) * 2002-12-06 2004-06-17 Mahle Gmbh Multi-part cooled piston for an internal combustion engine
DE102005041409A1 (en) * 2005-09-01 2007-03-08 Mahle International Gmbh Two-piece piston for an internal combustion engine
DE102005042003A1 (en) 2005-09-05 2007-03-08 Mahle International Gmbh Built, liquid cooled flask
CN113202654A (en) * 2021-05-18 2021-08-03 大昌汽车部件(苏州)有限公司 Combined engine piston and forging process thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757668A1 (en) * 1976-12-30 1978-07-06 Cummins Engine Co Inc INSULATING MULTIPLE PISTON FOR COMBUSTION ENGINES
DE2914456A1 (en) * 1979-04-10 1980-10-23 Schmidt Gmbh Karl BUILT PISTON FOR INTERNAL COMBUSTION ENGINES
DE3249290T1 (en) * 1981-12-28 1984-01-26 Alco Power Inc., 13021 Auburn, N.Y. COMPOSED PISTON
DE3719469A1 (en) * 1987-06-11 1988-12-29 Mahle Gmbh BUILT LIQUID-COOLED PISTON FOR COMBUSTION ENGINES
DE3830033A1 (en) * 1987-11-30 1989-06-08 Mahle Gmbh Built, oil-cooled piston for internal combustion engines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE281030C (en) *
FR1484865A (en) * 1966-06-10 1967-06-16 Mirrlees Nat Ltd Piston enhancements for internal combustion compression ignition engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757668A1 (en) * 1976-12-30 1978-07-06 Cummins Engine Co Inc INSULATING MULTIPLE PISTON FOR COMBUSTION ENGINES
DE2914456A1 (en) * 1979-04-10 1980-10-23 Schmidt Gmbh Karl BUILT PISTON FOR INTERNAL COMBUSTION ENGINES
DE3249290T1 (en) * 1981-12-28 1984-01-26 Alco Power Inc., 13021 Auburn, N.Y. COMPOSED PISTON
DE3719469A1 (en) * 1987-06-11 1988-12-29 Mahle Gmbh BUILT LIQUID-COOLED PISTON FOR COMBUSTION ENGINES
DE3830033A1 (en) * 1987-11-30 1989-06-08 Mahle Gmbh Built, oil-cooled piston for internal combustion engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 61-234260 A., In: Patents Abstracts of Japan, M-570, March 10, 1987, Vol.11, No.78 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004851A1 (en) 2001-07-06 2003-01-16 A.I.M.L. Gmbh Coolable annular support for internally cooled piston rings and method for the production thereof
DE102004027974A1 (en) * 2004-06-08 2005-12-29 Mahle Gmbh A built piston and method of preventing damage in contact surfaces of the top and bottom of the piston
DE102005061899A1 (en) * 2005-12-23 2007-06-28 Mahle International Gmbh Multipart piston for an internal combustion engine has upper and lower piston parts, a threaded head, a support plate with a plate body and a threaded body
DE102006027354A1 (en) * 2006-06-13 2007-12-20 Mahle International Gmbh Multi-piece cooled piston for an internal combustion engine

Also Published As

Publication number Publication date
DE4131275A1 (en) 1993-03-25
FR2681643A1 (en) 1993-03-26
FR2681643B1 (en) 1995-07-21

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