EP0523625A1 - Piston for an internal combustion engine - Google Patents

Piston for an internal combustion engine Download PDF

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Publication number
EP0523625A1
EP0523625A1 EP92111981A EP92111981A EP0523625A1 EP 0523625 A1 EP0523625 A1 EP 0523625A1 EP 92111981 A EP92111981 A EP 92111981A EP 92111981 A EP92111981 A EP 92111981A EP 0523625 A1 EP0523625 A1 EP 0523625A1
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EP
European Patent Office
Prior art keywords
piston
bore
channel
inlet
transverse bore
Prior art date
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Granted
Application number
EP92111981A
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German (de)
French (fr)
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EP0523625B1 (en
Inventor
Volker Dürsch
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.)
Novelis Deutschland GmbH
Original Assignee
Alcan Deutschland GmbH
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Publication date
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Application filed by Alcan Deutschland GmbH filed Critical Alcan Deutschland GmbH
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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 
    • F02F3/16—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

Definitions

  • the invention relates to a piston for internal combustion engines with a cooling channel, which is connected to an inlet channel and an outlet channel, which open into the interior of the piston or on the underside of the piston.
  • the invention has for its object to design a cooling channel piston of the type mentioned in such a way that a good supply of lubricating oil to the particularly stressed points of the piston pin bearing is ensured with easy manufacture.
  • This object is achieved in that both the inlet and the outlet channel of the cooling channel system are each penetrated by a transverse bore which extends from the outside of the piston skirt to the piston pin bore.
  • the oil required for lubrication can be removed from the oil to be supplied to the cooling channel or drained from this channel via this transverse bore and can be brought to the points which are particularly critical for the lubrication of the piston pin bearing. Due to the bolt movement during engine operation, this lubricating oil is then largely distributed in the bolt bearing, so that sufficient lubrication is ensured in it.
  • the transverse bore can be produced in the desired position and orientation from the outside of the piston in a simple manner.
  • the branch of the transverse bores extending between the outside of the shaft and the inlet or outlet channel is arranged coaxially in a straight line to the branch of the transverse bore extending between this channel and the piston pin bore, which further simplifies their manufacture.
  • the transverse bores can be arranged at any angle to the bolt bore or connecting rod oscillation plane and / or to the longitudinal axis of the piston, whereby the lubricating oil can be brought to any desired position of the piston pin bearing.
  • a cooling channel piston is already known, in which a transverse bore is provided which extends between the outside of the shaft and the inlet channel leading to the cooling channel.
  • this transverse bore does not open into the piston pin bore, but ends in the inlet channel.
  • This inlet channel is connected to the interior of the piston pin via a bore arranged in the hollow piston pin. Via this interior, pressure oil, which is fed to the interior of the bolt via the connecting rod, enters the inlet channel and from there, on the one hand, to the cooling channel and, on the other hand, to the outside of the shaft.
  • the bore provided in this piston therefore only serves to supply the piston running surface with lubricating oil, but not to lubricate the piston pin bearing.
  • the piston 1 shown in the drawing has an annular cooling channel 2 in its piston head, which is connected to an inlet channel 3 and an outlet channel 4, which open into the piston interior 5.
  • Both the inlet channel 3 and the outlet channel 4 are each penetrated by a transverse bore 6, which extend in a straight line from the outside of the shaft 7 to the piston pin bore 8.
  • These cross holes open with their inner branch 9 in lubrication pockets 10 which are arranged on the circumference of the piston pin bore.
  • pin securing grooves 11 are provided, into which securing rings 12 for holding the pin 13 can be inserted.
  • the transverse bores 6 extend perpendicular to the piston axis X-X and parallel to the connecting rod vibration plane. However, they can also run obliquely in order to lead to the desired locations of the piston pin bore that are critical for the pin lubrication.
  • the transverse bores can be closed in their outer branch extending between the outside of the shaft 7 and the inlet or outlet channel 3, 4 by an inserted plug, by pouring or the like.

Abstract

A piston for internal combustion engines with a cooling duct (2) which is connected to an inlet duct and an outlet duct (4), which open out on the underside of the piston or into the piston inner chamber (5). A transverse bore (6) which extends from the outside of the shaft (7) to the piston pin bore (8) passes through both the inlet duct and the outlet duct (4), respectively. In this way a good supply of lubricating oil is ensured to those parts of the piston pin bearing particularly subjected to stresses. <IMAGE>

Description

Die Erfindung betrifft einen Kolben für Brennkraftmaschinen mit einem Kühlkanal, der an einen Zulaufkanal und einen Ablaufkanal angeschlossen ist, die in den Kolbeninnenraum oder an der Kolbenunterseite ausmünden.The invention relates to a piston for internal combustion engines with a cooling channel, which is connected to an inlet channel and an outlet channel, which open into the interior of the piston or on the underside of the piston.

Bei derartigen Kühlkanalkolben ist die Schmierung der Kolbenbolzenlagerung wegen des gegenüber dieser Bolzenlagerung abgetrennten Kühlsystems in der Regel nicht gegeben. Um dieses Problem zu lösen, ist es zwar bekannt, bei Kühlkanalkolben Bohrungen vom Kolbeninnenraum zum Kühlkanal anzubringen, die es ermöglichen, daß vom Kühlkanal etwas Öl zur Bolzenschmierung austreten kann. Für denselben Zweck hat man auch Bohrungen vom Bolzenaußenende zum Kühlkanal angebracht. Beide Lösungen haben den Nachteil, daß sie aus herstellungstechnischen Gründen jeweils nur die Enden der Kolbenbolzenlagerung mit Öl versorgen, während die übrigen Lagerflächen nicht oder nicht ausreichend mit Schmieröl versorgt werden.In such cooling channel pistons, there is generally no lubrication of the piston pin bearing because of the cooling system that is separated from this pin bearing. To solve this problem, it is known to drill holes in the cooling channel piston from the interior of the piston to the cooling channel, which allow some oil to escape from the cooling channel for bolt lubrication. For the same purpose, holes have also been drilled from the outer end of the bolt to the cooling duct. Both solutions have the disadvantage that, for manufacturing reasons, they only supply the ends of the piston pin bearing with oil, while the other bearing surfaces are not or only insufficiently supplied with lubricating oil.

Gegenüber diesem bekannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Kühlkanalkolben der eingangs genannten Gattung derart zu gestalten, daß bei problemloser Herstellung eine gute Schmierölzuführung zu den besonders beanspruchten Stellen der Kolbenbolzenlagerung gewährleistet ist. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß sowohl der Zu- als auch der Ablaufkanal des Kühlkanalsystems jeweils von einer Querbohrung durchsetzt sind, die von der Schaftaußenseite des Kolbens zur Kolbenbolzenbohrung reicht. Über diese Querbohrung kann das zur Schmierung notwendige Öl von dem dem Kühlkanal zuzuführenden oder von diesem Kanal ablaufenden Öl entnommen und an die für die Schmierung der Kolbenbolzenlagerung besonders kritischen Stellen herangeführt werden. Durch die Bolzenbewegung während des Motorbetriebes wird dann dieses Schmieröl in dem Bolzenlager weitgehend verteilt, so daß in diesem eine ausreichende Schmierung gewährleistet wird. Die Querbohrung kann von der Kolbenaußenseite her in einfacher Weise in der gewünschten Lage und Ausrichtung hergestellt werden.Compared to this known prior art, the invention has for its object to design a cooling channel piston of the type mentioned in such a way that a good supply of lubricating oil to the particularly stressed points of the piston pin bearing is ensured with easy manufacture. This object is achieved in that both the inlet and the outlet channel of the cooling channel system are each penetrated by a transverse bore which extends from the outside of the piston skirt to the piston pin bore. The oil required for lubrication can be removed from the oil to be supplied to the cooling channel or drained from this channel via this transverse bore and can be brought to the points which are particularly critical for the lubrication of the piston pin bearing. Due to the bolt movement during engine operation, this lubricating oil is then largely distributed in the bolt bearing, so that sufficient lubrication is ensured in it. The transverse bore can be produced in the desired position and orientation from the outside of the piston in a simple manner.

Bei einer bevorzugten Ausführungsform des erfindungsgemäßen Bolzens ist der sich zwischen Schaftaußenseite und Zu- oder Ablaufkanal sich erstreckende Ast der Querbohrungen koaxial geradlinig zu dem sich zwischen diesem Kanal und der Kolbenbolzenbohrung erstreckenden Ast der Querbohrung angeordnet, was ihre Herstellung noch weiter vereinfacht. Die Querbohrungen können in beliebigem Winkel zur Bolzenbohrungs- bzw. Pleuelschwingebene und/oder zur Kolbenlängsachse verlaufend angeordnet werden, wodurch das Schmieröl an jede gewünschte Stelle der Kolbenbolzenlagerung herangeführt werden kann.In a preferred embodiment of the pin according to the invention, the branch of the transverse bores extending between the outside of the shaft and the inlet or outlet channel is arranged coaxially in a straight line to the branch of the transverse bore extending between this channel and the piston pin bore, which further simplifies their manufacture. The transverse bores can be arranged at any angle to the bolt bore or connecting rod oscillation plane and / or to the longitudinal axis of the piston, whereby the lubricating oil can be brought to any desired position of the piston pin bearing.

Durch die DE-PS 30 05 720 C2 ist zwar bereits ein Kühlkanalkolben bekannt geworden, bei dem eine Querbohrung vorgesehen ist, die sich zwischen der Schaftaußenseite und dem zum Kühlkanal führenden Zulaufkanal erstreckt. Diese Querbohrung mündet jedoch nicht in die Kolbenbolzenbohrung, sondern endet im Zulaufkanal. Dieser Zulaufkanal steht über eine in dem hohlen Kolbenbolzen angeordnete Bohrung mit dem Innenraum des Kolbenbolzens in Verbindung. Über diesen Innenraum gelangt Drucköl, das über das Pleuel dem Bolzeninnenraum zugeführt wird, in den Zulaufkanal und von dort einerseits in den Kühlkanal und andererseits an die Schaftaußenseite. Die bei diesem Kolben vorgesehene Bohrung dient daher lediglich zur Versorgung der Kolbenlauffläche mit Schmieröl, nicht aber zur Schmierung der Kolbenbolzenlagerung.From DE-PS 30 05 720 C2 a cooling channel piston is already known, in which a transverse bore is provided which extends between the outside of the shaft and the inlet channel leading to the cooling channel. However, this transverse bore does not open into the piston pin bore, but ends in the inlet channel. This inlet channel is connected to the interior of the piston pin via a bore arranged in the hollow piston pin. Via this interior, pressure oil, which is fed to the interior of the bolt via the connecting rod, enters the inlet channel and from there, on the one hand, to the cooling channel and, on the other hand, to the outside of the shaft. The bore provided in this piston therefore only serves to supply the piston running surface with lubricating oil, but not to lubricate the piston pin bearing.

Ein besonders vorteilhaftes Ausführungsbeispiel des erfindungsgemäßen Kolbens wird anhand der Zeichnung im folgenden näher beschrieben:

Fig. 1
zeigt diesen Kolben teilweise in Seitenansicht, teilweise im Axialschnitt in der die Kolbenbolzenachse enthaltenden Ebene,
Fig. 2
zeigt den Kolben teilweise in Seitenansicht, teilweise im Axialschnitt nach Linie II-II in Fig. 1,
Fig. 3
ist ein Querschnitt durch diesen Kolben nach Linie III-III in Fig. 1 und 2.
A particularly advantageous embodiment of the piston according to the invention is described in more detail below with reference to the drawing:
Fig. 1
shows this piston partly in side view, partly in axial section in the plane containing the piston pin axis,
Fig. 2
shows the piston partially in side view, partially in axial section along line II-II in Fig. 1,
Fig. 3
is a cross section through this piston according to line III-III in Figs. 1 and 2.

Der in der Zeichnung dargestellte Kolben 1 hat in seinem Kolbenboden einen ringförmigen Kühlkanal 2, der an einen Zulaufkanal 3 und an einen Ablaufkanal 4 angeschlossen ist, die in den Kolbeninnenraum 5 münden. Sowohl der Zulaufkanal 3 als auch der Ablaufkanal 4 sind jeweils von einer Querbohrung 6 durchsetzt, die sich geradlinig von der Schaftaußenseite 7 zur Kolbenbolzenbohrung 8 erstrecken. Diese Querbohrungen münden mit ihrem inneren Ast 9 in Schmiertaschen 10, die am Umfang der Kolbenbolzenbohrung angeordnet sind. An den Enden der Kolbenbolzenbohrung 8 sind Bolzensicherungsnuten 11 vorgesehen, in die Sicherungsringe 12 zur Halterung des Bolzens 13 einsetzbar sind.The piston 1 shown in the drawing has an annular cooling channel 2 in its piston head, which is connected to an inlet channel 3 and an outlet channel 4, which open into the piston interior 5. Both the inlet channel 3 and the outlet channel 4 are each penetrated by a transverse bore 6, which extend in a straight line from the outside of the shaft 7 to the piston pin bore 8. These cross holes open with their inner branch 9 in lubrication pockets 10 which are arranged on the circumference of the piston pin bore. At the ends of the piston pin bore 8, pin securing grooves 11 are provided, into which securing rings 12 for holding the pin 13 can be inserted.

Bei dem dargestellten Kolben erstrecken sich die Querbohrungen 6 senkrecht zur Kolbenachse X-X und parallel zur Pleuelschwingebene. Sie können aber auch schräg hierzu verlaufen, um an die gewünschten und für die Bolzenschmierung kritischen Stellen der Kolbenbolzenbohrung heranzuführen.In the piston shown, the transverse bores 6 extend perpendicular to the piston axis X-X and parallel to the connecting rod vibration plane. However, they can also run obliquely in order to lead to the desired locations of the piston pin bore that are critical for the pin lubrication.

Die Querbohrungen können nach Herstellung in ihrem sich zwischen Schaftaußenseite 7 und dem Zu- oder Ablaufkanal 3, 4 erstreckenden äußeren Ast durch einen eingesetzten Stopfen, durch Ausgießen oder dergleichen verschlossen werden.After manufacture, the transverse bores can be closed in their outer branch extending between the outside of the shaft 7 and the inlet or outlet channel 3, 4 by an inserted plug, by pouring or the like.

Claims (5)

Kolben für Brennkraftmaschinen mit einem Kühlkanal (2), der an einen Zulaufkanal (3) und einen Ablaufkanal (4) angeschlossen ist, die an der Kolbenunterseite oder in den Kolbeninnenraum ausmünden,
dadurch gekennzeichnet, daß der Zu- und der Ablaufkanal (3, 4) jeweils von einer Querbohrung (6) durchsetzt sind, die von der Schaftaußenseite (7) zur Kolbenbolzenbohrung (8) reicht.Pistons for internal combustion engines with a cooling channel (2), which is connected to an inlet channel (3) and an outlet channel (4), which open out on the underside of the piston or in the interior of the piston,
characterized in that the inlet and outlet channels (3, 4) are each penetrated by a transverse bore (6) which extends from the outside of the shaft (7) to the piston pin bore (8). Kolben nach Anspruch 1,
dadurch gekennzeichnet, daß der zwischen Schaftaußenseite (7) und Zu- oder Ablaufkanal (3, 4) sich erstreckende äußere Ast der Querbohrung (5) geradlinig zu dem sich zwischen diesem Kanal (3, 4) und der Kolbenbolzenbohrung (8) erstreckenden inneren Ast (9) der Querbohrung (6) angeordnet ist.Piston according to claim 1,
characterized in that the outer branch of the transverse bore (5) extending between the outer side of the shaft (7) and the inlet or outlet channel (3, 4) extends in a straight line to the inner branch extending between this channel (3, 4) and the piston pin bore (8) (9) the transverse bore (6) is arranged. Kolben nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet, daß die Querbohrung (6) geneigt zur Achse der Kolbenbolzenbohrung (8) oder zur Pleuelschwingebene und/oder zur Kolbenlängsachse sich erstreckt.Piston according to claims 1 and 2,
characterized in that the transverse bore (6) extends inclined to the axis of the piston pin bore (8) or to the connecting rod oscillation plane and / or to the longitudinal axis of the piston. Kolben nach Anspruch 1,
dadurch gekennzeichnet, daß die Querbohrung (6) in ihrem sich zwischen Schaftaußenseite (7) und dem Zu- oder Ablaufkanal (3, 4) erstreckenden äußeren Ast durch einen Stopfen oder dergleichen verschlossen ist.Piston according to claim 1,
characterized in that the transverse bore (6) in its outer branch extending between the outside of the shaft (7) and the inlet or outlet channel (3, 4) is closed by a stopper or the like. Kolben nach Anspruch 1,
dadurch gekennzeichnet, daß die Querbohrung (6) in eine Ölschmiertasche (10) an der Wandung der Kolbenbolzenbohrung (8) mündet.Piston according to claim 1,
characterized in that the transverse bore (6) opens into an oil lubrication pocket (10) on the wall of the piston pin bore (8).
EP92111981A 1991-07-15 1992-07-14 Piston for an internal combustion engine Expired - Lifetime EP0523625B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9108696U DE9108696U1 (en) 1991-07-15 1991-07-15
DE9108696U 1991-07-15

Publications (2)

Publication Number Publication Date
EP0523625A1 true EP0523625A1 (en) 1993-01-20
EP0523625B1 EP0523625B1 (en) 1995-10-11

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ID=6869282

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Application Number Title Priority Date Filing Date
EP92111981A Expired - Lifetime EP0523625B1 (en) 1991-07-15 1992-07-14 Piston for an internal combustion engine

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EP (1) EP0523625B1 (en)
DE (2) DE9108696U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6494170B2 (en) 2000-12-01 2002-12-17 Caterpillar Inc Two-piece piston assembly with skirt having pin bore oil ducts

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342044B4 (en) * 1993-12-09 2006-08-31 Mahle Gmbh Piston for an internal combustion engine
DE102017130691A1 (en) * 2017-12-20 2019-06-27 Man Truck & Bus Ag Device for lubricating a connecting rod bearing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB556076A (en) * 1942-02-16 1943-09-20 George Bergmann Cooling system for internal combustion engines
US3515035A (en) * 1968-07-05 1970-06-02 Brunswick Corp Piston pin lubrication
GB2024987A (en) * 1978-07-05 1980-01-16 Mahle Gmbh Oil-cooled Piston

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE804048C (en) * 1946-08-21 1951-04-16 Harry Ralph Ricardo piston
DE2730120A1 (en) * 1977-07-04 1979-01-25 Schmidt Gmbh Karl COOLED INTERNAL COMBUSTION PISTON
DE2743350A1 (en) * 1977-09-27 1979-04-05 Klaus Bruchner Reciprocating IC engine piston - is guided in cylinder by two axially spaced sets of oil pressure pockets around piston circumference
SE422979B (en) * 1978-09-06 1982-04-05 Bofors Ab LIQUID PISTON FLOATING ENGINE WITH OIL COOLED PISTON
FI65477C (en) * 1979-02-16 1984-05-10 Waertsilae Oy Ab SMOERJSYSTEM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB556076A (en) * 1942-02-16 1943-09-20 George Bergmann Cooling system for internal combustion engines
US3515035A (en) * 1968-07-05 1970-06-02 Brunswick Corp Piston pin lubrication
GB2024987A (en) * 1978-07-05 1980-01-16 Mahle Gmbh Oil-cooled Piston

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6494170B2 (en) 2000-12-01 2002-12-17 Caterpillar Inc Two-piece piston assembly with skirt having pin bore oil ducts

Also Published As

Publication number Publication date
DE59203962D1 (en) 1995-11-16
DE9108696U1 (en) 1991-08-29
EP0523625B1 (en) 1995-10-11

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