EP0166109A2 - Multipart piston for an internal-combustion engine - Google Patents

Multipart piston for an internal-combustion engine Download PDF

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Publication number
EP0166109A2
EP0166109A2 EP85105072A EP85105072A EP0166109A2 EP 0166109 A2 EP0166109 A2 EP 0166109A2 EP 85105072 A EP85105072 A EP 85105072A EP 85105072 A EP85105072 A EP 85105072A EP 0166109 A2 EP0166109 A2 EP 0166109A2
Authority
EP
European Patent Office
Prior art keywords
screws
ring surfaces
piston
areas
ring
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
Application number
EP85105072A
Other languages
German (de)
French (fr)
Other versions
EP0166109A3 (en
EP0166109B1 (en
Inventor
Alois Barth
Lothar Wiemann
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
Publication of EP0166109A2 publication Critical patent/EP0166109A2/en
Publication of EP0166109A3 publication Critical patent/EP0166109A3/en
Application granted granted Critical
Publication of EP0166109B1 publication Critical patent/EP0166109B1/en
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a multi-part plunger for internal combustion engines according to the preamble of claim 1.
  • a piston of the generic type is known from DE-OS 28 21 176.
  • the upper and lower parts of the piston are connected with relatively few screws, e.g. B. with four screws with a piston diameter above 200 mm.
  • the ring surfaces stand out slightly from each other under the thermal and mechanical stresses prevailing in engine operation. This then leads to increased pressures in the areas which are only in contact with one another, with the result that the materially permissible maximum loads are exceeded there.
  • cavitation can occur in the areas in which the ring surfaces stand out slightly from one another.
  • the piston consists of an upper part 1 and a lower part 2, which are connected by screws 3.
  • the illustration of the piston shows this with assembled but not yet tightened screws 3.
  • these are slightly curved in the lower part 2 in the circumferential direction of the ring surface with the zenith of the curvature 6 exactly in one area in the Middle of two adjacent screws 3-.
  • the screw hole 7 itself is additionally arranged in a depression 5 in the annular surface 4 of the lower part 2.

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  • 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)

Abstract

Bei einem mehrteiligen Tauchkolben für Verbrennungsmotoren, bei dem Ober- (1) und Unterteil (2) des Kolbens über sich deckende Ringflächen (4) aufeinanderliegen und dort durch die Ringflächen (4) durchstoßende Schrauben (3) miteinander verbunden sind, wird zumindest eine der Ringflächen (4) in Umfangsrichtung derart gewölbt daß die Ringflächen in dem Bereich zwischen den Schrauben im fertigmontierten Kolben stärker elastisch verspannt sind als in den Bereichen um die Schrauben (3). Durch eine solche elastische Vorspannung der Ringflächen (4)-Bereiche zwischen den Schrauben (3) soll ein Abheben der Ringflächen in diesen Bereichen während des Motorbetriebes sicher vermieden werden. Im Kaltzustand der fertigmontierten Kolben liegen die Ringflächen (4) über den gesamten Umfang gleichmäßig aneinander an, allerdings mit bereichsweise unterschiedlicher Vorspannung.In a multi-part plunger for internal combustion engines, in which the upper (1) and lower part (2) of the piston lie on overlapping ring surfaces (4) and there are screws (3) penetrating through the ring surfaces (4), at least one of them Annular surfaces (4) are curved in the circumferential direction in such a way that the annular surfaces are more elastically braced in the area between the screws in the fully assembled piston than in the areas around the screws (3). Such elastic prestressing of the ring surfaces (4) areas between the screws (3) is intended to reliably prevent lifting of the ring surfaces in these areas during engine operation. In the cold state of the fully assembled pistons, the ring surfaces (4) lie evenly against one another over the entire circumference, but with different preloads in some areas.

Description

Die Erfindung betrifft einen mehrteiligen Tauchkolben für Verbrennungsmotoren nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a multi-part plunger for internal combustion engines according to the preamble of claim 1.

Ein Kolben der gattungsmäßigen Art ist aus der DE-OS 28 21 176 bekannt. In Fällen, in denen Kolbenober-und unterteil nur mit relativ wenigen Schrauben verbunden sind, wie z. B. mit vier Schrauben bei einem Kolbendurchmesser oberhalb 200 mm, kann es in der Praxis vorkommen, daß sich die Ringflächen unter den im Motorbetrieb herrschenden thermischen und mechanischen Beanspruchungen leicht voneinander abheben. Dies führt dann zu erhöhten Pressungen in den Bereichen, die nur noch aufeinander aufliegen, mit der Folge, daß dort die materialmäßig zulässigen Höchstbelastungen überschritten werden. Desweiteren kann es in den Bereichen, in denen sich die Ringflächen leicht voneinander abheben, zu Kavitationsbildung kommen.A piston of the generic type is known from DE-OS 28 21 176. In cases where the upper and lower parts of the piston are connected with relatively few screws, e.g. B. with four screws with a piston diameter above 200 mm, it can happen in practice that the ring surfaces stand out slightly from each other under the thermal and mechanical stresses prevailing in engine operation. This then leads to increased pressures in the areas which are only in contact with one another, with the result that the materially permissible maximum loads are exceeded there. Furthermore, cavitation can occur in the areas in which the ring surfaces stand out slightly from one another.

Es ist daher Aufgabe der Erfindung, einen gattungsgemäßen Kolben so weiterzubilden, daß bei allen Betriebszuständen des Verbrennungsmotors eine sichere Anlage der gegeneinander verspannten Kolbenober- und Kolbenunterteile gewährleistet ist.It is therefore an object of the invention to develop a generic piston in such a way that, in all operating states of the internal combustion engine, a secure bearing of the piston upper and lower piston parts braced against one another is ensured.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1.This object is achieved by the characterizing features of claim 1.

Zweckmäßige Ausgestaltungen sind in den Unteransprüchen enthalten.Appropriate configurations are contained in the subclaims.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Diese zeigt einen mehrteiligen Kolben im Schnitt.An embodiment is shown in the drawing. This shows a multi-part piston in section.

Der Kolben besteht aus einem Oberteil 1 und einem Unterteil 2, die über Schrauben 3 miteinander verbunden sind. Die Darstellung des Kolbens zeigt diesen mit montierten, aber noch nicht fest angezogenen Schrauben 3. In den Bereichen der Ringflächen 4 zwischen den Schrauben sind diese bei dem Unterteil 2 leicht in Umfangsrichtung der Ringfläche gewölbt mit dem Zenit der Wölbung 6 genau in einem Bereich in der Mitte zweier benachbarter Schrauben 3-. Die Schrauben - Bohrung 7 selbst ist in der Ringfläche 4 des Unterteils 2 zusätzlich noch in einer Senke 5 angeordnet.The piston consists of an upper part 1 and a lower part 2, which are connected by screws 3. The illustration of the piston shows this with assembled but not yet tightened screws 3. In the areas of the ring surfaces 4 between the screws, these are slightly curved in the lower part 2 in the circumferential direction of the ring surface with the zenith of the curvature 6 exactly in one area in the Middle of two adjacent screws 3-. The screw hole 7 itself is additionally arranged in a depression 5 in the annular surface 4 of the lower part 2.

Bei dem fertig montierten Kolben sind Ober- und Unterteil 1, 2 derart über die Schrauben miteinander verspannt, daß die Ringflächen 4 der beiden Teile 1, 2 auf dem gesamten Umfang spaltlos aufeinanderliegen. In den gewölbten Abschnitten der Ringflächen steht das Material dadurch unter einer entsprechenden Vorspannung, die eine sichere Anlage für alle Betriebszustände garantiert.In the fully assembled piston upper and lower part 1, 2 are clamped together via the screws such that the annular surfaces 4 of the two parts 1, 2 lie on one another without gaps over the entire circumference. As a result, the material is pre-stressed in the curved sections of the ring surfaces, which guarantees a safe system for all operating conditions.

Claims (4)

1. Mehrteiliger Tauchkolben für Verbrennungsmotoren mit einem den Kolbenbolzen aufnehmenden Kolbenunterteil (2) und einem Kolbenoberteil (1), wobei diese Teile (1, 2) über eine an jedem Teil (1, 2) angeformte Ringrippe mit im wesentlichen quer zur Kolbenachse liegender Ringfläche (4) aneinanderliegenden und mittels durch diese Ringflächen geführte Schrauben (3) gegeneinander verspannbar sind, dadurch gekennzeichnet, daß im unverspannten Zustand zumindest eine der aufeinanderliegenden Ringflächen (4) in den zwischen den Schrauben (3) verlaufenden Bereichen derart gegenüber der axial engrenzenden anderen Ringflächen (4) in Umfangsrichtung gewölbt verläuft, daß sich die Ringflächen (4) lediglich in Bereichen berühren.1. Multi-part plunger for internal combustion engines with a piston lower part receiving the piston pin (2) and a piston upper part (1), these parts (1, 2) over an integrally formed on each part (1, 2) ring rib with an annular surface lying transversely to the piston axis (4) adjacent and by means of these ring surfaces guided screws (3) can be braced against each other, characterized in that, in the untensioned state, at least one of the ring surfaces (4) lying one on top of the other in the areas between the screws (3) in relation to the axially delimiting other ring surfaces (4) curved in the circumferential direction so that the ring surfaces (4) only touch in areas. 2. Mehrteiliger Tauchkolben nach Anspruch 1, dadurch gekennzeichnet , daß im unverspannten Zustand der axiale Abstand zwischen den gegenüberliegenden Ringflächen (4) von dem in der Mitte zwischen zwei Schrauben (3) liegenden Bereichen zu den Schrauben (3) hin kontinuierlich abnimmt.2. Multi-part plunger according to claim 1, characterized in that in the unstressed state, the axial distance between the opposite ring surfaces (4) from the area between two screws (3) lying areas to the screws (3) decreases continuously. 3. Tauchkolben nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die in Umfangsrichtung verlaufende Wölbung (6) über die Radialerstreckung der Ringflächen (4) gleich ist.3. plunger according to claim 1 or 2, characterized in that the circumferential curvature (6) over the radial extent of the ring surfaces (4) is the same. 4. Tauchkolben nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Bohrungen (7) der Schrauben (3) in je einer bis zu den radialen Rändern der Ringflächen (4) sich erstreckenden Senke (5) ausgebildet sind.4. Plunger according to one of the preceding claims, characterized in that the bores (7) of the screws (3) are each formed in a depression (5) extending up to the radial edges of the annular surfaces (4).
EP85105072A 1984-06-27 1985-04-26 Multipart piston for an internal-combustion engine Expired EP0166109B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3423559 1984-06-27
DE3423559A DE3423559C1 (en) 1984-06-27 1984-06-27 Multi-part plunger for internal combustion engines

Publications (3)

Publication Number Publication Date
EP0166109A2 true EP0166109A2 (en) 1986-01-02
EP0166109A3 EP0166109A3 (en) 1986-12-30
EP0166109B1 EP0166109B1 (en) 1989-04-26

Family

ID=6239195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105072A Expired EP0166109B1 (en) 1984-06-27 1985-04-26 Multipart piston for an internal-combustion engine

Country Status (4)

Country Link
US (1) US4603617A (en)
EP (1) EP0166109B1 (en)
JP (1) JPH0660595B2 (en)
DE (1) DE3423559C1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3540085A1 (en) * 1985-11-12 1987-05-14 Alcan Aluminiumwerke PISTON FOR INTERNAL COMBUSTION ENGINES
BR9001859A (en) * 1990-04-17 1991-11-12 Metal Leve Sa EMBOLO AND EMBOLO MANUFACTURING PROCESS
BR9001916A (en) * 1990-04-20 1991-11-12 Metal Leve Sa PROCESS OF OBTAINING REFRIGERATED PUMP AND REFRIGERATED PUMP
US5092290A (en) * 1990-09-13 1992-03-03 Navistar International Transportation Corp. Engine piston assembly with planar pin mounting surface
BR9005376A (en) * 1990-10-18 1992-06-16 Metal Leve Sa BIPARTITE EMBULE WITH POSTIC GALLERY CLOSING AND PROCESS FOR YOUR OBTAINING
US5499572A (en) * 1993-08-26 1996-03-19 Cobble; Daniel L. Bi-tech piston
DE19642109A1 (en) * 1996-10-12 1998-04-16 Mahle Gmbh Built piston
DE19721013A1 (en) * 1997-05-20 1998-12-03 Mahle Gmbh Bolt arrangement with the piston built
US6182630B1 (en) 1998-11-23 2001-02-06 Federal-Mogul World Wide, Inc. Bolted articulated piston
GB2384541A (en) * 2002-01-25 2003-07-30 Federal Mogul Bradford Ltd Piston with gap between crown and body portion to allow for heat expansion
US7100480B2 (en) * 2003-04-02 2006-09-05 Irwin Industrial Tool Company Quick adjusting pliers
DE102007019931A1 (en) * 2007-04-27 2008-10-30 Mahle International Gmbh Method for screwing two metal parts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165619A (en) * 1937-07-10 1939-07-11 Nash Kelvinator Corp Piston
DE1269414B (en) * 1966-06-15 1968-05-30 Mahle Kg Internal combustion engine piston with base plate
DE2821176A1 (en) * 1978-05-13 1979-11-15 Mahle Gmbh PISTON WITH BASE PLATE FOR COMBUSTION ENGINE
DE3116475A1 (en) * 1980-04-30 1982-04-15 Kawasaki Jukogyo K.K., Kobe, Hyogo Piston for an internal combustion engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029112A (en) * 1959-02-02 1962-04-10 Napier & Son Ltd Composite structures, particularly composite pistons
US3960048A (en) * 1975-03-28 1976-06-01 Illinois Tool Works Inc. Fastener assembly for creating accurate tension indicating fastener and method of calibrating the same
DE2832970A1 (en) * 1978-07-27 1980-02-07 Schmidt Gmbh Karl BUILT LIQUID-COOLED PISTON FOR INTERNAL COMBUSTION ENGINES
JPS5744814A (en) * 1980-08-31 1982-03-13 Fujitsu Ltd Waveform regulating circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165619A (en) * 1937-07-10 1939-07-11 Nash Kelvinator Corp Piston
DE1269414B (en) * 1966-06-15 1968-05-30 Mahle Kg Internal combustion engine piston with base plate
DE2821176A1 (en) * 1978-05-13 1979-11-15 Mahle Gmbh PISTON WITH BASE PLATE FOR COMBUSTION ENGINE
DE3116475A1 (en) * 1980-04-30 1982-04-15 Kawasaki Jukogyo K.K., Kobe, Hyogo Piston for an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MACHINE DESIGN, Band 39, Nr. 6, 9. März 1967, Seite 72, Penton Publishing Co., Cleveland, US; *

Also Published As

Publication number Publication date
JPS6116251A (en) 1986-01-24
JPH0660595B2 (en) 1994-08-10
US4603617A (en) 1986-08-05
EP0166109A3 (en) 1986-12-30
DE3423559C1 (en) 1985-09-26
EP0166109B1 (en) 1989-04-26

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