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EP0334855B1 - Coolable trunk piston for internal combustion engines - Google Patents

Coolable trunk piston for internal combustion engines Download PDF

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Publication number
EP0334855B1
EP0334855B1 EP87907219A EP87907219A EP0334855B1 EP 0334855 B1 EP0334855 B1 EP 0334855B1 EP 87907219 A EP87907219 A EP 87907219A EP 87907219 A EP87907219 A EP 87907219A EP 0334855 B1 EP0334855 B1 EP 0334855B1
Authority
EP
European Patent Office
Prior art keywords
piston
wall
annular wall
annular
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
Application number
EP87907219A
Other languages
German (de)
French (fr)
Other versions
EP0334855A1 (en
Inventor
Eberhard Kopf
Joachim Wille
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 EP0334855A1 publication Critical patent/EP0334855A1/en
Application granted granted Critical
Publication of EP0334855B1 publication Critical patent/EP0334855B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02F3/0069—Multi-part pistons the crown and skirt being interconnected by the gudgeon pin
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins
    • 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
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding

Definitions

  • the invention relates to a coolable plunger for internal combustion engines according to the preamble of claim 1.
  • Such pistons are known from US-PS 43 77 967.
  • the wall part (shaped sheet metal) used there to cover the cavity forming the cooling oil chamber is crimped onto the outer circumference of the ring wall carrying the piston rings. This type of fastening is unsafe because flanging of the relatively thin-walled wall part can become detached in the long term in motor operation.
  • the invention has for its object to provide a cover in the genus known from US-A-43 77 967, which on the one hand ensures movements of the lower end of the outer ring wall of the piston head and on the other hand is sufficiently securely attached to the piston head.
  • the collar protruding beyond the ring wall, which is flanged around the wall part, can be made much thicker than the wall part itself and thereby provide a more stable flared connection.
  • the presence of joints between the multi-part cover wall ensures the necessary freedom of movement of the outer ring wall of the piston head.
  • the multi-part structure of the wall part enables the cooling oil annulus to be completely covered over its entire open area. With a one-piece design of the wall part, on the other hand, this would not be possible, since the cross sections of the pin bosses of the piston head taper from the free end of a hub to the piston head base, so that a one-piece wall part completely covering the cooling oil annulus would not be able to be pushed over the hubs.
  • the piston consists overall of a head part 1, on the hubs 2 of which a piston shaft 3 is articulated via a piston pin (not shown).
  • An outer ring wall 4 containing the grooves for the piston rings extends from the bottom of the head part 1. Radially at a distance within the ring wall 4, an annular rib 5 connects the hubs 2 to the piston head. Between the annular rib 5 and the annular wall 4 there is an annular cavity 6, which is covered by a sheet metal part 7, which has the shape of an annular recess, to form a closed annular space. The cavity 6 can be acted upon by cooling oil through the sheet metal part 7.
  • the bleaching part 7 lies against the inner edge of the free end ring surface of the ring wall 4 and is held there by a collar 8 which flares radially inwards and extends from the outer edge of the ring wall.
  • the bleaching part 7 is separated radially into two halves. These halves abut each other on joints 9.
  • the oil supply into the annular cavity 6 takes place through an indentation 10 provided on the inner edge of the bleaching part 7.
  • the oil is discharged through a diametrically opposite opening 11 which can lie in the bottom of the annular trough of the bleaching part 7.
  • the opening 11 can also be provided as an indentation on the inner edge of the bleaching part 7 and thus correspond to the formation of the oil supply opening.
  • the annular rib 5 contains radial bores 12. In order to achieve a shaker effect in the space 13 lying radially inside the annular rib 5, this is at sienem Connecting rod head facing open end covered with an additional tub-shaped bleaching part 14. The oil drain from this space can take place via the gap between this sheet metal part 14 and the annular rib 5 or the hubs 2.
  • the sheet metal part 7 covering the outer annular cavity 6 can also be fastened to the outer ring wall 4 by welding or screwing instead of by flanging.
  • a weld is shown in Fig. 3 and a screw in Fig. 4.

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)

Abstract

In a two-piece piston with a head piece (1) and a trunk (3) hinged only over the piston pin, it is known to cover an annular space (6) radially located inside the piston ring groove and open in the direction of the trunk (3) with a sheet metal part (7), forming a cooling oil duct. In the known embodiment, the sheet metal part (7) is attached by crimping it on the annular wall (4) that carries the piston rings. Because of the reduced thickness of the sheet metal part (7), this attachment method is not reliable during long working periods of the piston. It is furthermore sought to cover the cooling oil annular space (6) as completely as possible. According to the invention, the sheet metal part (7) is held by a collar (8) that extends from the outer annular wall (4) of the head piece (1) and is crimped around the sheet metal part (7). For optimally covering the annular space (6), the sheet metal part (7) is radially divided into two parts.

Description

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

Derartige Kolben sind aus US-PS 43 77 967 bekannt. Das dort zur Abdeckung des den Kühlölraum bildenden Hohlraumes verwendete Wandteil (geformtes Blech) ist an den Außenumfang der die Kolbenringe tragenden Ringwand angebördelt. Diese Art der Befestigung ist unsicher, da eine Bördelung des relativ dünnwandigen Wandteiles sich im Motorbetrieb auf Dauer lösen kann.Such pistons are known from US-PS 43 77 967. The wall part (shaped sheet metal) used there to cover the cavity forming the cooling oil chamber is crimped onto the outer circumference of the ring wall carrying the piston rings. This type of fastening is unsafe because flanging of the relatively thin-walled wall part can become detached in the long term in motor operation.

Die Verwendung eines einteiligen dickwandigen und damit wegen seiner höheren Steifigkeit eine sicherere Befestigung gewährleistenden Wandteiles ist wiederum aus anderen Gründen unerwünscht. Das die Kolbenringe aufnehmende äußere Ringteil des Kolbenkopfes soll sich während des Motorbetriebes an seinem unteren Ende ohne Behinderung durch das eingebrachte Wandteil verformen können. Solche Verformungen treten bedingt durch die explosionsartig ablaufenden Verbrennungsvorgänge auf und können, wenn sie behindert werden, zu Rissen im Kolbenkopfmaterial führen. Insofern eignen sich für die erforderliche Abdeckung des Kühlölringraumes auch weder einstückige Blechabdeckungen, wie sie aus FR-A-23 23 022 bekannt sind noch Abdeckungen, die aus fest miteinander verbundenen Einzelteilen bestehen, wie sie bei Kolben in US-A-26 98 210 beschrieben sind.The use of a one-piece, thick-walled wall part, which because of its higher rigidity ensures secure fastening, is again undesirable for other reasons. The outer ring part of the piston head, which receives the piston rings, should be able to deform at its lower end without hindrance by the wall part introduced during engine operation. Such deformations occur due to the explosive combustion processes and, if they are hindered, can lead to cracks in the piston head material. In this respect, neither one-piece sheet metal covers, as are known from FR-A-23 23 022, nor covers, which consist of firmly connected individual parts, as are described for pistons in US-A-26 98 210, are suitable for the required covering of the cooling oil annulus are.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, bei dem gattungsmäßig aus US-A-43 77 967 bekannten Kolben eine Abdekkung zu schaffen, die einerseits Bewegungen des unteren Endes der äußeren Ringwand des Kolbenkopfes gewährleistet und die andererseits ausreichend sicher an dem Kolbenkopf befestigt ist.Proceeding from this, the invention has for its object to provide a cover in the genus known from US-A-43 77 967, which on the one hand ensures movements of the lower end of the outer ring wall of the piston head and on the other hand is sufficiently securely attached to the piston head.

Gelöst wird diese Aufgabe durch eine Ausführung des Aufbaus und der Befestigung des den Kühlölraum abdeckenden Wandteiles nach den kennzeichnenden Merkmalen des Patentanspruchs 1.This object is achieved by executing the structure and the fastening of the wall part covering the cooling oil chamber according to the characterizing features of patent claim 1.

Der über die Ringwand hinausragende Kragen, der um das Wandteil herumgebördelt ist, kann wesentlich dicker ausgeführt sein, als das Wandteil selbst und dadurch eine stabilere Bördelverbindung liefern. Das Vorhandensein von Fugen zwischen der mehrteiligen Abdeckwand gewährleistet die notwendige Bewegungsfreiheit der äußeren Ringwand des Kolbenkopfes. Darüber hinaus ermöglicht es die Mehrteiligkeit des Wandteiles, den Kühlölringraum über seine gesamte offene Fläche vollständig abzudecken. Bei einer einteiligen Ausführung des Wandteiles wäre dies dagegen nicht möglich, da sich die Querschnitte der Bolzennaben des Kolbenkopfes von dem jeweils freien Ende einer Nabe zu dem Kolbenkopfboden hin verjüngen, wodurch ein einteiliges den Kühlölringraum komplett abdeckendes Wandteil nicht über die Naben aufschiebbar wäre.The collar protruding beyond the ring wall, which is flanged around the wall part, can be made much thicker than the wall part itself and thereby provide a more stable flared connection. The presence of joints between the multi-part cover wall ensures the necessary freedom of movement of the outer ring wall of the piston head. In addition, the multi-part structure of the wall part enables the cooling oil annulus to be completely covered over its entire open area. With a one-piece design of the wall part, on the other hand, this would not be possible, since the cross sections of the pin bosses of the piston head taper from the free end of a hub to the piston head base, so that a one-piece wall part completely covering the cooling oil annulus would not be able to be pushed over the hubs.

Alternative Lösungen der erfindungsgemäßen Aufgabe sind Gegenstand der unabhängigen Ansprüche 2 und 3.Alternative solutions to the problem according to the invention are the subject of independent claims 2 and 3.

Zweckmäßige Ausgestaltungen der erfindungsgemäßen Lösungen enthalten die Unteransprüche.Appropriate embodiments of the solutions according to the invention contain the subclaims.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Es zeigen

  • Fig. 1 einen Kolben im Längsschnitt
  • Fig. 2 einen Schnitt durch den Kolben nach den Pfeilen 11-11
  • Fig. 3 einen Ausschnitt aus einem Längsschnitt durch einen Kolben mit angeschweißter Abdeckwand
  • Fig. 4 einen Ausschnitt aus einem Längsschnitt durch einen Kolben mit angeschraubter Abdeckwand
An embodiment is shown in the drawing. Show it
  • Fig. 1 shows a piston in longitudinal section
  • Fig. 2 shows a section through the piston according to the arrows 11-11
  • Fig. 3 shows a detail from a longitudinal section through a piston with a welded cover wall
  • Fig. 4 shows a detail from a longitudinal section through a piston with a screwed cover wall

Der Kolben besteht insgesamt aus einem Kopfteil 1, an dessen Naben 2 über einen nicht dargestellten Kolbenbolzen ein Kolbenschaft 3 angelenkt ist.The piston consists overall of a head part 1, on the hubs 2 of which a piston shaft 3 is articulated via a piston pin (not shown).

Von dem Boden des Kopfteils 1 erstreckt sich eine äußere die Nuten für die Kolbenringe enthaltende Ringwand 4. Radial mit Abstand innerhalb der Ringwand 4 verbindet eine Ringrippe 5 die Naben 2 mit dem Kolbenboden. Zwischen Ringrippe 5 und Ringwand 4 existiert ein ringförmiger Hohlraum 6, der durch ein Blechteil 7, das die Form einer Ringmulde aufweist, zu einem geschlossenen Ringraum abgedeckt ist. Der Hohlraum 6 ist durch das Blechteil 7 hindurch mit Kühlöl beaufschlagbar.An outer ring wall 4 containing the grooves for the piston rings extends from the bottom of the head part 1. Radially at a distance within the ring wall 4, an annular rib 5 connects the hubs 2 to the piston head. Between the annular rib 5 and the annular wall 4 there is an annular cavity 6, which is covered by a sheet metal part 7, which has the shape of an annular recess, to form a closed annular space. The cavity 6 can be acted upon by cooling oil through the sheet metal part 7.

Das Bleichteil 7 liegt an dem inneren Rand der freien Stirnringfläche der Ringwand 4 an und wird dortvon einem vom äußberen Rand der Ringwand ausgehenden nach radial innen gebördelten Kragen 8 gehalten.The bleaching part 7 lies against the inner edge of the free end ring surface of the ring wall 4 and is held there by a collar 8 which flares radially inwards and extends from the outer edge of the ring wall.

Das Bleichteil 7 ist radial in zwei Hälften getrennt. Diese Hälften liegen an Fugen 9 aneinander. Die Ölzufuhr in den ringförmigen Hohlraum 6 erfolgt durch eine an dem inneren Rand des Bleichteiles 7 vorgesehene Einbuchtung 10.The bleaching part 7 is separated radially into two halves. These halves abut each other on joints 9. The oil supply into the annular cavity 6 takes place through an indentation 10 provided on the inner edge of the bleaching part 7.

Die Abfuhr des Oles erfolgt durch eine diametral gegenüberliegend vorgesehene Öffnung 11 die im Boden der ringförmigen Mulde des Bleichteiles 7 liegen kann. Die Öffnung 11 kann aber auch als Einbuchtung am inneren Rand des Bleichteiles 7 vorgesehen sein un damit der Ausbildung der Ölzuführöffnung entsprechen.The oil is discharged through a diametrically opposite opening 11 which can lie in the bottom of the annular trough of the bleaching part 7. The opening 11 can also be provided as an indentation on the inner edge of the bleaching part 7 and thus correspond to the formation of the oil supply opening.

Um aus dem äußeren ringförmigen Hohlraum 8 Kühlöl auch noch in den radial innerhalb der Ringrippe 5 liegenden Raum führen zu können, enthält die Ringrippe 5 radiale Bohrungen 12. Zur Erzielung einer Shakerwirkung in dem radial innerhalb der Ringrippe 5 liegenden Raum 13 ist dieser an sienem dem Pleuelkopf zuwandten offenen Ende mit einem zusätzlichen wannenförmigend Bleichteil 14 abgedeckt. Der Ölabfluß aus diesem Raum kann über den Spalt zwischen diesem Blechteil 14 und der Ringrippe 5 bzw. den Naben 2 erfolgen.In order to also be able to lead cooling oil from the outer annular cavity 8 into the space lying radially inside the annular rib 5, the annular rib 5 contains radial bores 12. In order to achieve a shaker effect in the space 13 lying radially inside the annular rib 5, this is at sienem Connecting rod head facing open end covered with an additional tub-shaped bleaching part 14. The oil drain from this space can take place via the gap between this sheet metal part 14 and the annular rib 5 or the hubs 2.

Das den äußern ringförmigen Hohlraum 6 andeckende Blechteil 7 kann anstelle durch eine Bördelung auch durch Verschweißung oder Verschraubung an der äußeren Ringwand 4 befestigt sein. Eine Verschweißung ist in Fig. 3 und eine Verschraubung in Fig. 4 dargestellt.The sheet metal part 7 covering the outer annular cavity 6 can also be fastened to the outer ring wall 4 by welding or screwing instead of by flanging. A weld is shown in Fig. 3 and a screw in Fig. 4.

Claims (6)

1. A coolable trunk piston for internal combustion engines consisting of a head part with hubs formed thereon for receiving the little-end connecting the piston to the connecting rod, an outer annular wall, which passes into the base of the piston head part at a first end and leads out openly at its second end, for receiving at least one piston ring groove and with a cavity which is radially adjacent inside this annular wall, is open to the second end of the annular wall, and surrounds the hubs or their supporting members which extend to the base of the piston head and can be, in particular, a type of annular rib, which cavity can be sealed roughly at the level of the second end of the annular wall by a wall part fixed on the annular wall for forming a permeateable cooling oil chamber, and a piston shank connected to the head part only via the little-end, characterised in that the wall part (sheet metal part 7) rests on a collar (8) which projects radially externally from the annular end face of the end wall (4) and is bent back round the edge of the wall part (7) and is radially divided at least once over its periphery, the individual parts lying on one another at joints (9).
2. A coolable trunk piston for internal combustion engines consisting of a head part with hubs formed thereon for receiving the little-end connecting the piston to the connecting rod, an outer annular wall, which passes into the base of the piston head part at a first end and leads out openly at its second end, for receiving at least one piston ring groove and with a cavity which is radially adjacent inside this annular wall, is open to the second end of the annular wall, and surrounds the hubs or their supporting members which extend to the base of the piston head and can be, in particular, a type of annular rib, which cavity can be sealed roughly at the level of the second end of the annular wall by a wall part fixed on the annular wall for forming a permeateable cooling oil chamber, and a piston shank connected to the head part only via the little-end, characterised in that the wall part (7) is fixed on the annular wall (4) in the open end region thereof by individual screws engaging in the annular wall (4) and is radially divided at least once over its periphery, the individual parts lying on one another at joints (9).
3. A coolable trunk piston for internal combustion engines consisting of a head part with hubs formed thereon for receiving the little-end connecting the piston to the connecting rod, an outer annular wall, which passes into the base of the piston head part at a first end and leads out openly at its second end, for receiving at least one piston ring groove and with a cavity which is radially adjacent inside this annular wall, is open to the second end of the annular wall, and surrounds the hubs or their supporting members which extend to the base of the piston head and can be, in particular, a type of annular rib, which cavity can be sealed roughly at the level of the second end of the annular wall by a wall part fixed on the annular wall for forming a permeateable cooling oil chamber, and a piston shank connected to the head part only via the little-end, characterised in that the wall part (7) is welded or soldered on the annular wall (4) in the open end region thereof and is radially divided at least once over its periphery, the individual parts lying on one another at joints (9).
4. A coolable trunk piston according to one of the preceding claims, characterised in that the wall part (7) is a sheet metal part.
5. A coolable trunk piston according to one of the preceding claims, characterised in that the wall part (7) is formed as an annular trough of which the trough side faces the annular cavity (6) of the head part (1).
6. A coolable trunk piston according to one of the preceding claims, characterised in that the radial bay (10) is shaped in the internal edge of the wall part (7) at least for the supply of oil into the annular cavity (6) of the head part (1).
EP87907219A 1986-12-17 1987-10-24 Coolable trunk piston for internal combustion engines Expired - Lifetime EP0334855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863643039 DE3643039A1 (en) 1986-12-17 1986-12-17 COOLABLE SUBMERSIBLE PISTON FOR COMBUSTION ENGINES
DE3643039 1986-12-17

Publications (2)

Publication Number Publication Date
EP0334855A1 EP0334855A1 (en) 1989-10-04
EP0334855B1 true EP0334855B1 (en) 1990-08-08

Family

ID=6316366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87907219A Expired - Lifetime EP0334855B1 (en) 1986-12-17 1987-10-24 Coolable trunk piston for internal combustion engines

Country Status (6)

Country Link
US (1) US5052280A (en)
EP (1) EP0334855B1 (en)
JP (1) JPH02501153A (en)
BR (1) BR8707917A (en)
DE (2) DE3643039A1 (en)
WO (1) WO1988004725A1 (en)

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Also Published As

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WO1988004725A1 (en) 1988-06-30
EP0334855A1 (en) 1989-10-04
DE3643039A1 (en) 1988-06-30
US5052280A (en) 1991-10-01
DE3764275D1 (en) 1990-09-13
JPH02501153A (en) 1990-04-19
BR8707917A (en) 1989-10-31

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