EP0370215B1 - Engine-braking system for an internal-combustion engine - Google Patents

Engine-braking system for an internal-combustion engine Download PDF

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Publication number
EP0370215B1
EP0370215B1 EP89118571A EP89118571A EP0370215B1 EP 0370215 B1 EP0370215 B1 EP 0370215B1 EP 89118571 A EP89118571 A EP 89118571A EP 89118571 A EP89118571 A EP 89118571A EP 0370215 B1 EP0370215 B1 EP 0370215B1
Authority
EP
European Patent Office
Prior art keywords
control
hole
oil return
cylinder head
engine
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
EP89118571A
Other languages
German (de)
French (fr)
Other versions
EP0370215A1 (en
Inventor
Wolf-Dietrich Prof. Körner
Thomas Harr
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
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Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Publication of EP0370215A1 publication Critical patent/EP0370215A1/en
Application granted granted Critical
Publication of EP0370215B1 publication Critical patent/EP0370215B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • 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
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • 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
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries

Definitions

  • the invention relates to an engine brake device for an internal combustion engine according to the further features specified in the preamble of claim 1.
  • An engine brake device of the generic type is known from DE-OS 34 28 626.
  • the control piston inserted in the control bore of the cylinder head is actuated by compressed air. Due to the high opening and closing speed of the control piston, relatively high frictional resistances occur between the piston bore wall and there is a risk that the control piston jams in the control bore.
  • the invention has for its object to design the generic engine brake such that its function and stability is significantly improved in a structurally simple manner.
  • Lubrication of the control pistons is achieved in a simple manner by the invention without additional production expenditure, in which a part of the lubricating oil flowing out of the rocker arm space into the crankcase is branched off to the control bore.
  • the lubrication also increases the stability, since the friction between the piston and the control bore is reduced and the piston is largely prevented from becoming stuck in the control bore.
  • the lubrication achieves an additional cooling effect on the control piston, by means of which the wear of a sealing ring arranged on the control piston is reduced, which likewise contributes to an improvement in the stability.
  • the cylinder head 1 shows a cylinder head 1 of an internal combustion engine operating on the diesel principle, which closes the opening of a cylinder 2.
  • the cylinder head 1 contains a throttle valve 3 for each cylinder 2.
  • the throttle valve 3 designed as a poppet valve is guided with its valve stem 4 in the cylinder head 1 and controls a throttle opening 7 located in the cylinder head base 7 with its valve disk 5.
  • the throttle valve 3 is actuated from a control piston 8, which rests with its base plate 9 on the end of the valve stem 4 and is inserted in a stepped control bore 10 of the cylinder head 1.
  • the likewise stepped control piston is guided in the tapered part of the control bore 10 with a guide section 11 and is sealingly held in the expanded part of the control bore by means of a sealing ring 13 arranged on the upper section 12.
  • the control piston 8 is adjusted by means of compressed air, which acts on the top of the control piston 8 in a controlled manner from the start of the braking process from a brake switching valve.
  • the throttle valve 3 opens so that the gas compressed by the piston 14 in the cylinder 2 is displaced through the throttle opening 7 into the outlet channel 15.
  • the control bore 8 is provided next to a rocker arm 16.
  • Receiving bores 17 for the gas exchange valves, not shown, are arranged in the rocker arm space 16.
  • the rocker arm, also not shown, for actuating the gas exchange valves is located in the rocker arm space 16.
  • the rocker arms are mounted on rocker arm axles and are lubricated with lubricating oil from the lubricating oil circuit. The lubricating oil dripping from the bearing points into the rocker arm space 16 is drained through an oil return bore 18 into the crankcase.
  • the oil return bore 18 is provided with a connection opening 19 to the control bore 10.
  • the control piston 8 in the control bore 10 is lubricated in a structurally simple manner by part of the lubricating oil discharged from the rocker arm space 16 into the crankcase.
  • the connecting opening 19 is provided in the tapered part of the control bore 10.
  • the position of the control bore 10 is matched to the course of the oil return bore 18 in such a way that the oil return bore 18 cuts the control bore 8 in the tapered bore part.
  • the resulting common cutting line forms the edge of the connection opening 19. This connection between the bores 10 and 18 takes place in a very small space and without an additional connection channel.

Description

Die Erfindung bezieht sich auf eine Motorbremsvorrichtung für eine Brennkraftmaschine gemäß den weiteren im Oberbegriff des Patentanspruchs 1 angegebenen Merkmalen.The invention relates to an engine brake device for an internal combustion engine according to the further features specified in the preamble of claim 1.

Eine Motorbremsvorrichtung der gattungsgemäßen Bauart ist aus der DE-OS 34 28 626 bekannt. Der in der Steuerbohrung des Zylinderkopfes eingesetzte Steuerkolben wird mittels Druckluft betätigt. Infolge der hohen Öffnungs- und Schließgeschwindigkeit des Steuerkolbens treten relativ hohe Reibwiderstände zwischen Kolben-Bohrungswand auf und es besteht die Gefahr, daß der Steuerkolben in der Steuerbohrung verklemmt.An engine brake device of the generic type is known from DE-OS 34 28 626. The control piston inserted in the control bore of the cylinder head is actuated by compressed air. Due to the high opening and closing speed of the control piston, relatively high frictional resistances occur between the piston bore wall and there is a risk that the control piston jams in the control bore.

Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäße Motorbremse derart auszubilden, daß auf bauliche einfache Weise deren Funktion und Standfestigkeit wesentlich verbessert ist.The invention has for its object to design the generic engine brake such that its function and stability is significantly improved in a structurally simple manner.

Die Aufgabe ist erfindungsgemäß durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmale gelöst.The object is achieved by the features specified in the characterizing part of patent claim 1.

Durch die Erfindung wird auf einfache Weise ohne zusätzlichen Fertigungsaufwand eine Schmierung der Steuerkolben erzielt, in dem ein Teil des aus dem Kipphebelraum in das Kurbelgehäuse abfließenden Schmieröles zur Steuerbohrung abgezweigt wird. Durch die Schmierung wird ferner eine Erhöhung der Standfestigkeit erzielt, da die Reibung zwischen Kolben und Steuerbohrung verringert und ein Festsetzen des Kolbens in der Steuerbohrung weitgehend verhindert wird. Ferner wird durch die Schmierung ein zusätzlicher Kühleffekt am Steuerkolben erzielt, durch den der Verschleiß eines am Steuerkolben angeordneten Dichtringes verringert wird, was ebenfalls zu einer Verbesserung der Standfestigkeit beiträgt. Mit der Verbindung von Ölrücklaufbohrung und Steuerbohrung wird gleichzeitig eine Entlüftung des unter dem Steuerkolben liegenden Raumes erreicht, so daß auf die Anbringung einer besonderen Entlüftungsbohrung verzichtet werden kann.Lubrication of the control pistons is achieved in a simple manner by the invention without additional production expenditure, in which a part of the lubricating oil flowing out of the rocker arm space into the crankcase is branched off to the control bore. The lubrication also increases the stability, since the friction between the piston and the control bore is reduced and the piston is largely prevented from becoming stuck in the control bore. Furthermore, the lubrication achieves an additional cooling effect on the control piston, by means of which the wear of a sealing ring arranged on the control piston is reduced, which likewise contributes to an improvement in the stability. With the connection of the oil return bore and the control bore, venting of the space under the control piston is achieved at the same time, so that there is no need for a special vent bore.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der abhängigen Ansprüche.Further embodiments of the invention are the subject of the dependent claims.

In der nachfolgenden Zeichnungsbeschreibung wird ein Ausführungsbeispiel der Erfindung an Hand zweier Abbildungen näher erläutert. Es zeigen:

  • Figur 1 von der erfindungsgemäßen Motorbremsvorrichtung das Drosselventil mit Steuerkolben in einem Querschnitt durch den Zylinderkopf einer Brennkraftmaschine und,
  • Figur 2 die Lage der Steuerbohrung zur Führung des Steuerkolbens am Zylinderkopf aus Figur 1 in einer Draufsicht.
In the following description of the drawings, an embodiment of the invention is explained in more detail with the aid of two illustrations. Show it:
  • 1 of the engine brake device according to the invention, the throttle valve with control piston in a cross section through the cylinder head of an internal combustion engine, and
  • Figure 2 shows the position of the control bore for guiding the control piston on the cylinder head of Figure 1 in a plan view.

In Figur 1 ist von einer nach dem Dieselprinzip arbeitenden Brennkraftmaschine ein Zylinderkopf 1 dargestellt, der die Öffnung eines Zylinders 2 verschließt. Neben den nicht dargestellten Gaswechselventilen enthält der Zylinderkopf 1 für jeden Zylinder 2 ein Drosselventil 3. Das als Tellerventil ausgebildete Drosselventil 3 ist mit seinem Ventilschaft 4 im Zylinderkopf 1 geführt und steuert mit seinem Ventilteller 5 eine im Zylinderkopfboden befindliche Drosselöffnung 7. Betätigt wird das Drosselventil 3 von einem Steuerkolben 8, der mit seiner Bodenplatte 9 auf dem Ende des Ventilschaftes 4 aufliegt und in einer abgestuften Steuerbohrung 10 des Zylinderkopfes 1 eingesetzt ist. Der ebenfalls abgestufte Steuerkolben ist im verjüngten Teil der Steuerbohrung 10 mit einem Führungsabschnitt 11 geführt und im erweiterten Teil der Steuerbohrung mittels eines am oberen Abschnitt 12 angeordneten Dichtringes 13 dichtend gehalten. Die Verstellung des Steuerkolbens 8 erfolgt mittels Druckluft, die mit Beginn des Bremsvorganges von einem Bremsschaltventil aus gesteuert die Oberseite des Steuerkolbens 8 beaufschlagt.1 shows a cylinder head 1 of an internal combustion engine operating on the diesel principle, which closes the opening of a cylinder 2. In addition to the gas exchange valves (not shown), the cylinder head 1 contains a throttle valve 3 for each cylinder 2. The throttle valve 3 designed as a poppet valve is guided with its valve stem 4 in the cylinder head 1 and controls a throttle opening 7 located in the cylinder head base 7 with its valve disk 5. The throttle valve 3 is actuated from a control piston 8, which rests with its base plate 9 on the end of the valve stem 4 and is inserted in a stepped control bore 10 of the cylinder head 1. The likewise stepped control piston is guided in the tapered part of the control bore 10 with a guide section 11 and is sealingly held in the expanded part of the control bore by means of a sealing ring 13 arranged on the upper section 12. The control piston 8 is adjusted by means of compressed air, which acts on the top of the control piston 8 in a controlled manner from the start of the braking process from a brake switching valve.

Das Drosselventil 3 öffnet, so daß das vom Kolben 14 im Zylinder 2 verdichtete Gas durch die Drosselöffnung 7 in den Auslaßkanal 15 verdrängt wird.The throttle valve 3 opens so that the gas compressed by the piston 14 in the cylinder 2 is displaced through the throttle opening 7 into the outlet channel 15.

Aus Figur 2 ist zu erkennen, daß die Steuerbohrung 8 neben einem Kipphebelraum 16 vorgesehen ist. Im Kipphebelraum 16 sind Aufnahmebohrungen 17 für die nicht dargestellten Gaswechselventile angeordnet. Außerdem befinden sich im Kipphebelraum 16 die ebenfalls nicht dargestellten Kipphebel zum Betätigen der Gaswechselventile. Die Kipphebel sind dabei auf Kipphebelachsen gelagert und werden mit Schmieröl aus dem Schmierölkreislauf geschmiert. Das aus den Lagerstellen in den Kipphebelraum 16 abtropfende Schmieröl wird durch eine Ölrücklaufbohrung 18 in das Kurbelgehäuse abgeleitet.From Figure 2 it can be seen that the control bore 8 is provided next to a rocker arm 16. Receiving bores 17 for the gas exchange valves, not shown, are arranged in the rocker arm space 16. In addition, the rocker arm, also not shown, for actuating the gas exchange valves is located in the rocker arm space 16. The rocker arms are mounted on rocker arm axles and are lubricated with lubricating oil from the lubricating oil circuit. The lubricating oil dripping from the bearing points into the rocker arm space 16 is drained through an oil return bore 18 into the crankcase.

Erfindungsgemäß ist nun vorgesehen, daß die Ölrücklaufbohrung 18 mit einer Verbindungsöffnung 19 zur Steuerbohrung 10 versehen ist. Hierdurch wird auf baulich einfache Weise der Steuerkolben 8 in der Steuerbohrung 10 von einem Teil des aus dem Kipphebelraum 16 in das Kurbelgehäuse abgeführten Schmieröls geschmiert. Um hierbei eine gezielte Schmierung des Führungsabschnitts 11 am Steuerkolben 8 zu erreichen, ist die Verbindungsöffnung 19 in dem verjüngten Teil der Steuerbohrung 10 vorgesehen. Hierdurch wird gleichzeitig der unter dem Steuerkolben 8 liegende Raum über die Verbindungsöffnung 19 zum Kurbelgehäuse hin entlüftet.According to the invention, it is now provided that the oil return bore 18 is provided with a connection opening 19 to the control bore 10. As a result, the control piston 8 in the control bore 10 is lubricated in a structurally simple manner by part of the lubricating oil discharged from the rocker arm space 16 into the crankcase. In order to achieve targeted lubrication of the guide section 11 on the control piston 8, the connecting opening 19 is provided in the tapered part of the control bore 10. As a result, the space under the control piston 8 is simultaneously vented through the connection opening 19 to the crankcase.

Wie Figur 2 zeigt, ist die Lage der Steuerbohrung 10 so auf den Verlauf der Ölrücklaufbohrung 18 abgestimmt, daß die Ölrücklaufbohrung 18 die Steuerbohrung 8 im verjüngten Bohrungsteil anschneidet. Die hierdurch entstehende gemeinsame Schnittlinie bildet dabei den Rand der Verbindungsöffnung 19. Diese Verbindung zwischen den Bohrungen 10 und 18 erfolgt auf engstem Raum und ohne einen zusätzlichen Verbindungskanal.As FIG. 2 shows, the position of the control bore 10 is matched to the course of the oil return bore 18 in such a way that the oil return bore 18 cuts the control bore 8 in the tapered bore part. The resulting common cutting line forms the edge of the connection opening 19. This connection between the bores 10 and 18 takes place in a very small space and without an additional connection channel.

Claims (3)

1. An engine brake device for an internal combustion engine with a throttle valve (3) mounted in the cylinder head (1) for the control of a throttle opening (7) situated between a cylinder (2) and an outlet channel (15) and with a control piston (8) actuating the throttle valve (3) which is mounted in a control hole (10) in the cylinder head (1) and is impinged with compressed air during the braking process, and furthermore with rocker arms mounted in the cylinder head (1) in a rocker arm space (16) to actuate the gas-reversing valves, the bearings of the rocker arms being lubricated with lubricating oil from the lubricating oil circuit of the internal combustion engine, and lubricating oil dripping from the bearings into the rocker arm syace being diverted into the crankcase through an oil return hole (18),
characterized in that
the oil return hole (18) is provided with a connection opening (19) leading to the control hole (10).
2. An engine brake device according to claim 1,
characterized in that
the control piston (8) is stepped and has a sealing (12) as well as a guiding (11) portion, the connection opening (19) being provided in the wall of the control hole situated adjacent to the guiding portion (11).
3. An engine brake device according to either claim 1 or 1,
characterized in that
the control hole (10) and the oil return hole (18) are arranged respective to each other in such a manner that the oil return hole (18) intersects the control hole (10), the joint intersection line constituting the edge of the connection opening (19).
EP89118571A 1988-11-23 1989-10-06 Engine-braking system for an internal-combustion engine Expired - Lifetime EP0370215B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839452A DE3839452A1 (en) 1988-11-23 1988-11-23 ENGINE BRAKE DEVICE FOR AN INTERNAL COMBUSTION ENGINE
DE3839452 1988-11-23

Publications (2)

Publication Number Publication Date
EP0370215A1 EP0370215A1 (en) 1990-05-30
EP0370215B1 true EP0370215B1 (en) 1992-04-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118571A Expired - Lifetime EP0370215B1 (en) 1988-11-23 1989-10-06 Engine-braking system for an internal-combustion engine

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US (1) US4930471A (en)
EP (1) EP0370215B1 (en)
DE (2) DE3839452A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5215054A (en) * 1990-10-22 1993-06-01 Jenara Enterprises Ltd. Valve control apparatus and method
SE467503B (en) * 1990-11-23 1992-07-27 Volvo Ab COMBUSTOR FUNCTION ENGINE
DE19839420A1 (en) * 1998-08-29 2000-03-02 Deutz Ag Engine brake device for an internal combustion engine
US6216667B1 (en) 1999-11-12 2001-04-17 Frank J. Pekar Method and device for a supercharged engine brake
AT510528B1 (en) 2010-09-23 2012-09-15 Avl List Gmbh FOUR-STROKE COMBUSTION ENGINE WITH A MOTOR BRAKE
AT510529B1 (en) 2010-09-23 2012-10-15 Avl List Gmbh FOUR-STROKE COMBUSTION ENGINE WITH A MOTOR BRAKE
AT510527B1 (en) 2010-09-23 2012-09-15 Avl List Gmbh FOUR-STROKE COMBUSTION ENGINE WITH A MOTOR BRAKE
AT518933B1 (en) 2016-07-20 2018-07-15 Avl List Gmbh INTERNAL COMBUSTION ENGINE WITH A VALVE ACTUATING DEVICE

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB426064A (en) * 1933-11-04 1935-03-27 Enfield Cycle Co Ltd An improved lubricating system for an internal combustion engine
US2304255A (en) * 1941-01-27 1942-12-08 Nash Kelvinator Corp Oil pan baffle
SE443021B (en) * 1979-09-03 1986-02-10 Yanmar Diesel Engine Co FORBRENNINGSMOTOR
DE3225478C1 (en) * 1982-07-08 1983-09-29 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Internal combustion engine, in particular for motor vehicles
DE3346371A1 (en) * 1983-12-22 1985-07-04 Audi AG, 8070 Ingolstadt Device for lubricating the stems of gas exchange valves in the cylinder head of a reciprocating internal combustion engine
DE3428626A1 (en) * 1984-08-03 1986-02-13 Daimler-Benz Ag, 7000 Stuttgart Four-stroke internal combustion engine
JPH0629530B2 (en) * 1984-11-01 1994-04-20 ヤマハ発動機株式会社 Engine lubricator
CA1328589C (en) * 1985-08-21 1994-04-19 Honda Giken Kogyo Kabushiki Kaisha (Also Trading As Honda Motor Co., Ltd .) Oil supply system for a valve operating mechanism in internal combustion engines

Also Published As

Publication number Publication date
DE3839452A1 (en) 1990-05-31
DE3839452C2 (en) 1991-03-07
EP0370215A1 (en) 1990-05-30
US4930471A (en) 1990-06-05
DE58901086D1 (en) 1992-05-07

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