EP1974131B1 - Gas exchange valve actuating device - Google Patents

Gas exchange valve actuating device Download PDF

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Publication number
EP1974131B1
EP1974131B1 EP07702753A EP07702753A EP1974131B1 EP 1974131 B1 EP1974131 B1 EP 1974131B1 EP 07702753 A EP07702753 A EP 07702753A EP 07702753 A EP07702753 A EP 07702753A EP 1974131 B1 EP1974131 B1 EP 1974131B1
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EP
European Patent Office
Prior art keywords
gas exchange
internal combustion
combustion engine
exchange valve
actuating device
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EP07702753A
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German (de)
French (fr)
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EP1974131A1 (en
Inventor
Markus Dietrich
Stefan Rudert
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Mercedes Benz Group AG
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Daimler AG
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Publication of EP1974131A1 publication Critical patent/EP1974131A1/en
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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
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • 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
    • 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
    • F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type

Definitions

  • the invention relates to a gas exchange valve actuating device according to the preamble of patent claim 1.
  • a gas exchange valve actuating device with a lever for transmitting a drive movement to gas exchange valves. Furthermore, the gas exchange valve actuating device comprises an engine brake unit.
  • the internal combustion engine brake unit is coupled to one of the gas exchange valves via a hydraulic unit and via a valve pin movably guided in a valve web.
  • a gas exchange valve actuating device with a lever for transmitting a drive movement to gas exchange valves.
  • the gas exchange valve operating device includes an engine brake unit.
  • the engine brake unit is via a hydraulic unit with the lever and a lever for Transmission of a drive motion coupled to a pump-nozzle unit.
  • the gas exchange valve operating device includes an engine brake unit.
  • the engine brake unit is coupled via a hydraulic unit to the lever and a lever for transmitting a drive movement to a pump-nozzle unit.
  • the invention is in particular the object of providing a generic gas exchange valve actuating device, which allows a particularly compact design.
  • the object is solved by the features of patent claim 1, wherein further embodiments of the invention can be taken from the subclaims.
  • the invention is based on a gas exchange valve actuating device with a lever for transmitting a drive movement to at least one gas exchange valve and with an internal combustion engine brake unit. It is proposed that the engine brake unit is coupled with the lever in terms of drive technology at least in a braking mode.
  • the term "drive-coupled” should be understood to mean that the lever is used in at least one braking mode by the engine brake unit as a force transmission means in order to actuate at least one gas exchange valve.
  • Existing components can be used advantageously, and it can be saved additional components, space, weight and installation costs, especially when the lever is provided to actuate at least two gas exchange valves.
  • the lever may be formed by various levers that appear appropriate to those skilled in the art, which are pivotally guided with a fixed bearing axis or without space-fixed bearing axis, in particular tilt or rocker arms.
  • the term "intended” should be understood to mean in particular specially equipped and / or designed.
  • the engine brake unit comprises a hydraulic unit for transmitting a drive movement to the gas exchange valve, whereby particularly flexible and space-saving large forces can be transmitted structurally simple.
  • other power transmission units which appear reasonable to the person skilled in the art are also conceivable, such as in particular purely mechanical, electromechanical and / or electromagnetic power transmission units, etc.
  • the engine brake unit comprises a one-piece housing unit having at least one bearing point for a slave piston and at least one bearing point for a master piston of the hydraulic unit, and in particular if the housing unit at least in addition at least one bearing point for a Having valve means.
  • the hydraulic unit of the engine brake unit could be partially or completely integrated in a camshaft housing and / or in a cylinder head.
  • a stroke of the gas exchange valve desired for a brake mode can advantageously be designed to be particularly flexible and precisely adjustable.
  • the engine brake unit has a roller follower comprising a cam follower, whereby a particularly low friction can be achieved, in particular during a braking mode.
  • a cam follower with a sliding element for coupling to a cam.
  • the friction and associated losses can be reduced by the engine brake unit decoupled from the lever in at least one operating mode and / or the engine brake unit is decoupled in at least one operating mode by a drive means, such as in particular a cam.
  • a drive means such as in particular a cam.
  • decoupled is meant in particular that a in the at least one braking mode is moved part of the internal combustion engine unit for driving the lever or a part moved by a drive means of the internal combustion engine unit in the at least one mode different from the braking mode of the movement of the lever or from the movement of the drive means.
  • the internal combustion engine brake unit has a brake cam with at least two elevations, the freedom of design of a braking mode can be increased and, in particular, a braking process can be optimized.
  • the engine brake unit has at least one control and / or regulating means which is provided for actuating gas exchange valves assigned to at least two differentiating engine cylinders, which in turn can save additional components, installation space, assembly costs and costs.
  • FIG. 1 shows a section of an internal combustion engine with a gas exchange valve actuator according to the invention obliquely from above.
  • the gas exchange valve actuating device comprises a fork-shaped rocker arm 10 for transmitting a drive movement from an exhaust cam 25 arranged on an exhaust camshaft 28 to two gas exchange valves 11, 12 which form exhaust valves.
  • the rocker arm 10 is pivotally mounted on a fixed bearing axis 26 and is coupled via a cam follower formed by a rolling element 27 with the exhaust cam 25.
  • the gas exchange valve actuating unit comprises an engine brake unit 13 comprising a hydraulic unit, which is drive-coupled to the rocker arm 10 in a braking mode ( characters 2 to 6 ).
  • the engine brake unit 13 has a one-piece housing unit 15, which has a bearing point 16 for a slave piston 17, a bearing point 18 for a master piston 19 and a bearing point 20 for a valve means 21 formed by a control valve.
  • the slave piston 17 is along a movement axis 30, the master piston 19 is guided along a movement axis 31 and the valve means 21 is movable along a movement axis 32, the movement axes 30, 31, 32 each perpendicular to an axis 29 of the housing unit 15 and tilted towards each other are.
  • the pistons 17, 19 and the valve means 21 are connected to each other via hydraulic channels 33 of the housing unit 15.
  • the housing unit 15 has a supply channel 34, via which and via a central control means 24 formed by a magnetic valve, the valve means 21 and the pistons 17, 19 can be coupled to an engine oil circuit 35 and pressurized with engine oil ( Figures 3 and 4 ).
  • the control means 24 is provided for the actuation of a plurality of gas turbine valves 11, 12 assigned to differing engine cylinders.
  • the slave piston 17 When the brake mode is deactivated or in a drive mode of the internal combustion engine, the slave piston 17 is spaced from a brake cam 23 forming a drive means of the engine brake unit 13 and the master piston 17 is spaced from the rocker arm 10 or the engine brake unit 13 is in motion of the brake cam 23 and the movement of the rocker arm 10 decoupled ( FIGS. 4 to 6 ).
  • the control means 24 When the braking mode is activated, the control means 24 is moved from its in FIG. 4 illustrated blocking position by means of an electromagnet 43 against a spring force of a Spring element 44 connected in its flow position.
  • the valve means 21 is pressurized and thus switches conditional on its in FIG. 4 illustrated blocking position against a spring force of a spring element 45 in its flow position, so that via a valve means 21 integrated check valve 36 pressure chambers 37, 38 of the housing unit 15 are acted upon by engine oil and the slave piston 17 in the direction of the brake cam 23 and the master piston 19 in the direction of the rocker arm 10 are charged.
  • the slave piston 17 applies a braking surface 39 to the brake cam 23, which has a plurality of elevations.
  • the engine brake unit 13 could also be formed with a cam follower 22 comprising a rolling element, as shown in FIG FIG. 5 is indicated.
  • the master piston 19 is partially embodied in one piece with a hydraulic stroke limiting unit 14 of the engine brake unit 13 ( FIGS. 4 and 6 ).
  • the Hubbegrenzungsaku 14 includes a return spring 40 which loads the master piston 19 in the direction away from the rocker arm 10 and the master piston 19 facing away with a rocker arm 10 end face against a side facing away from the rocker arm 10 side, spring-loaded in the direction of the rocker arm 10 closure means 41st suppressed.
  • the closure means 41 closes a channel 42 in the master piston 19.
  • the slave piston 17 slides on a base circle of the brake cam 23, the master piston 19 is held by the return spring 40 in its position facing away from the rocker arm 10.
  • the master piston 19 is displaced in the direction of the rocker arm 10 and bears against a joint head 46 of an adjusting screw 47 fastened in the rocker arm 10 (FIG. FIG. 6 ). About the adjusting screw 47, the engine unit 13 and a brake play can be adjusted. Subsequently, the rocker arm 10 is driven via the master piston 19 and the gas exchange valves 11, 12 are opened.
  • the solenoid 43 is deactivated and the control means 24 is - driven by the spring force of the spring element 44 - moved into its blocking position. Due to the pressure drop at the valve means 21, the same is also displaced by the spring force of the spring element 45 in its blocking position. In the blocking position of the valve means 21, a connection between the engine oil circuit 35 and the pressure chambers 37, 38 is interrupted. Furthermore, the pressure chambers 37, 38 on the Valve means 21 connected to a tank 48, so that the engine oil from the pressure chambers 37, 38 can flow. The slave piston 17 is displaced by the brake cam 23 in its the brake cam 23 remote end position and the master piston 19 is moved by the spring force of the return spring 40 in its the toggle lever 10 opposite end position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention is based on a gas exchange valve actuating device having a lever (10), for transmitting a drive movement to at least one gas exchange valve (11, 12), and having an internal combustion engine braking unit (13). It is proposed that the internal combustion engine braking unit (13) is coupled in terms of drive to the lever (10) at least in a braking mode.

Description

Die Erfindung betrifft eine Gaswechselventilbetätigungsvorrichtung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a gas exchange valve actuating device according to the preamble of patent claim 1.

Aus der EP 0 818 612 B1 ist eine Gaswechselventilbetätigungsvorrichtung mit einem Hebel zur Übertragung einer Antriebsbewegung auf Gaswechselventile bekannt. Ferner umfasst die Gaswechselventilbetätigungsvorrichtung eine Brennkraftmaschinenbremseinheit. Die Brennkraftmaschinenbremseinheit ist über eine Hydraulikeinheit und über einen beweglich in einem Ventilsteg geführten Ventilstift mit einem der Gaswechselventile gekoppelt.From the EP 0 818 612 B1 is known a gas exchange valve actuating device with a lever for transmitting a drive movement to gas exchange valves. Furthermore, the gas exchange valve actuating device comprises an engine brake unit. The internal combustion engine brake unit is coupled to one of the gas exchange valves via a hydraulic unit and via a valve pin movably guided in a valve web.

Aus der US 5,036,810 ist eine Gaswechselventilbetätigungsvorrichtung mit einem Hebel zur Übertragung einer Antriebsbewegung auf Gaswechselventile bekannt. Die Gaswechselventilbetätigungsvorrichtung umfasst eine Brennkraftmaschinenbremseinheit. Die Brennkraftmaschinenbremseinheit ist über eine Hydraulikeinheit mit dem Hebel und einen Hebel zur Übertragung einer Antriebsbewegung auf eine Pumpe-Düse-Einheit gekoppelt.From the US 5,036,810 is known a gas exchange valve actuating device with a lever for transmitting a drive movement to gas exchange valves. The gas exchange valve operating device includes an engine brake unit. The engine brake unit is via a hydraulic unit with the lever and a lever for Transmission of a drive motion coupled to a pump-nozzle unit.

Aus der US 2003/0188703 ist eine Gaswechselventilbetätigungsvorrichtung mit einem Hebel zur Übertragung einer Antriebsbewegung auf Gaswechselventile bekannt. Der Hebel ist über eine Hydraulikeinheit mit dem Gaswechselventil gekoppelt.From the US 2003/0188703 is known a gas exchange valve actuating device with a lever for transmitting a drive movement to gas exchange valves. The lever is coupled via a hydraulic unit with the gas exchange valve.

Aus der US 4,711,210 ist eine gattungsbildende Gaswechselventilbetätigungsvorrichtung mit einem Hebel zur Übertragung einer Antriebsbewegung auf Gaswechselventile bekannt. Die Gaswechselventilbetätigungsvorrichtung umfasst eine Brennkraftmaschinenbremseinheit. Die Brennkraftmaschinenbremseinheit ist über eine Hydraulikeinheit mit dem Hebel und einen Hebel zur Übertragung einer Antriebsbewegung auf eine Pumpe-Düse-Einheit gekoppelt.From the US 4,711,210 is a generic gas exchange valve actuating device with a lever for transmitting a drive movement to gas exchange valves known. The gas exchange valve operating device includes an engine brake unit. The engine brake unit is coupled via a hydraulic unit to the lever and a lever for transmitting a drive movement to a pump-nozzle unit.

Der Erfindung liegt insbesondere die Aufgabe zugrunde, eine gattungsgemäße Gaswechselventilbetätigungsvorrichtung bereitzustellen, die eine besonders kompakte Bauweise ermöglicht. Die Aufgabe wird gelöst durch die Merkmale des Patentanspruchs 1, wobei weitere Ausgestaltungen der Erfindung den Unteransprüchen entnommen werden können.The invention is in particular the object of providing a generic gas exchange valve actuating device, which allows a particularly compact design. The object is solved by the features of patent claim 1, wherein further embodiments of the invention can be taken from the subclaims.

Die Erfindung geht aus von einer Gaswechselventilbetätigungsvorrichtung mit einem Hebel zur Übertragung einer Antriebsbewegung auf wenigstens ein Gaswechselventil und mit einer Brennkraftmaschinenbremseinheit. Es wird vorgeschlagen, dass die Brennkraftmaschinenbremseinheit zumindest in einem Bremsmodus antriebstechnisch mit dem Hebel gekoppelt ist. Dabei soll unter "antriebstechnisch gekoppelt" insbesondere verstanden werden, dass der Hebel in zumindest einem Bremsmodus von der Brennkraftmaschinenbremseinheit als Kraftübertragungsmittel genutzt wird, um wenigstens ein Gaswechselventil zu betätigen. Vorhandene Bauteile können vorteilhaft genutzt werden, und es können zusätzliche Bauteile, Bauraum, Gewicht und Montageaufwand eingespart werden, und zwar insbesondere, wenn der Hebel dazu vorgesehen ist, zumindest zwei Gaswechselventile zu betätigen. Ist der Hebel dazu vorgesehen, zumindest zwei Gaswechselventile zu betätigen, können zudem ein vorteilhafter gleicher Hub und gleiche Steuerzeiten der entsprechenden Gaswechselventile erreicht werden. Der Hebel kann von verschiedenen, dem Fachmann als sinnvoll erscheinenden Hebeln gebildet sein, die mit einer raumfesten Lagerachse oder auch ohne raumfeste Lagerachse schwenkbar geführt sind, wie insbesondere Kipp- oder Schlepphebel. Unter "vorgesehen" soll dabei insbesondere speziell ausgestattet und/oder ausgelegt verstanden werden.The invention is based on a gas exchange valve actuating device with a lever for transmitting a drive movement to at least one gas exchange valve and with an internal combustion engine brake unit. It is proposed that the engine brake unit is coupled with the lever in terms of drive technology at least in a braking mode. In this context, the term "drive-coupled" should be understood to mean that the lever is used in at least one braking mode by the engine brake unit as a force transmission means in order to actuate at least one gas exchange valve. Existing components can be used advantageously, and it can be saved additional components, space, weight and installation costs, especially when the lever is provided to actuate at least two gas exchange valves. If the lever is provided to actuate at least two gas exchange valves, moreover, an advantageously identical stroke and equal control times of the corresponding gas exchange valves can be achieved. The lever may be formed by various levers that appear appropriate to those skilled in the art, which are pivotally guided with a fixed bearing axis or without space-fixed bearing axis, in particular tilt or rocker arms. The term "intended" should be understood to mean in particular specially equipped and / or designed.

In einer weiteren Ausgestaltung wird vorgeschlagen, dass die Brennkraftmaschinenbremseinheit eine Hydraulikeinheit zur Übertragung einer Antriebsbewegung auf das Gaswechselventil umfasst, wodurch besonders flexibel und Platz sparend große Kräfte konstruktiv einfach übertragen werden können. Grundsätzlich sind jedoch auch andere, dem Fachmann als sinnvoll erscheinende Kraftübertragungseinheiten denkbar, wie insbesondere rein mechanische, elektromechanische und/oder elektromagnetische Kraftübertragungseinheiten usw.In a further embodiment, it is proposed that the engine brake unit comprises a hydraulic unit for transmitting a drive movement to the gas exchange valve, whereby particularly flexible and space-saving large forces can be transmitted structurally simple. In principle, however, other power transmission units which appear reasonable to the person skilled in the art are also conceivable, such as in particular purely mechanical, electromechanical and / or electromagnetic power transmission units, etc.

Ferner können zusätzliche Bauteile, Montageaufwand und Kosten eingespart werden, wenn die Brennkraftmaschinenbremseinheit eine einstückige Gehäuseeinheit umfasst, die zumindest eine Lagerstelle für einen Nehmerkolben und zumindest eine Lagerstelle für einen Geberkolben der Hydraulikeinheit aufweist, und insbesondere, wenn die Gehäuseeinheit zumindest zusätzlich zumindest eine Lagerstelle für ein Ventilmittel aufweist. Alternativ könnte die Hydraulikeinheit der Brennkraftmaschinenbremseinheit teilweise oder auch vollständig in ein Nockenwellengehäuse und/oder in einen Zylinderkopf integriert sein.Furthermore, additional components, assembly costs and costs can be saved if the engine brake unit comprises a one-piece housing unit having at least one bearing point for a slave piston and at least one bearing point for a master piston of the hydraulic unit, and in particular if the housing unit at least in addition at least one bearing point for a Having valve means. Alternatively, the hydraulic unit of the engine brake unit could be partially or completely integrated in a camshaft housing and / or in a cylinder head.

Umfasst die Brennkraftmaschinenbremseinheit eine hydraulische Hubbegrenzungseinheit, kann ein für einen Bremsmodus gewünschter Hub des Gaswechselventils vorteilhaft besonders flexibel und exakt einstellbar ausgeführt werden.If the internal combustion engine brake unit comprises a hydraulic stroke limiting unit, a stroke of the gas exchange valve desired for a brake mode can advantageously be designed to be particularly flexible and precisely adjustable.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, dass die Brennkraftmaschinenbremseinheit einen einen Wälzkörper umfassenden Nockenfolger aufweist, wodurch insbesondere während eines Bremsmodus eine besonders geringe Reibung erreicht werden kann. Alternativ ist jedoch auch denkbar, einen Nockenfolger mit einem Gleitelement zur Kopplung an einen Nocken vorzusehen.In a further embodiment of the invention, it is proposed that the engine brake unit has a roller follower comprising a cam follower, whereby a particularly low friction can be achieved, in particular during a braking mode. Alternatively, however, it is also conceivable to provide a cam follower with a sliding element for coupling to a cam.

Ferner können die Reibung und damit verbundene Verluste reduziert werden, indem die Brennkraftmaschinenbremseinheit in zumindest einem Betriebsmodus vom Hebel entkoppelt und/oder die Brennkraftmaschinenbremseinheit in zumindest einem Betriebsmodus von einem Antriebsmittel, wie insbesondere einem Nocken, entkoppelt ist. Unter "entkoppelt" soll dabei insbesondere verstanden werden, dass ein in dem mindestens einen Bremsmodus bewegtes Teil der Brennkraftmaschineneinheit zum Antrieb des Hebels bzw. ein von einem Antriebsmittel bewegtes Teil der Brennkraftmaschineneinheit in dem zumindest einen vom Bremsmodus differierenden Betriebsmodus von der Bewegung des Hebels bzw. von der Bewegung des Antriebsmittels entkoppelt ist.Further, the friction and associated losses can be reduced by the engine brake unit decoupled from the lever in at least one operating mode and / or the engine brake unit is decoupled in at least one operating mode by a drive means, such as in particular a cam. By "decoupled" is meant in particular that a in the at least one braking mode is moved part of the internal combustion engine unit for driving the lever or a part moved by a drive means of the internal combustion engine unit in the at least one mode different from the braking mode of the movement of the lever or from the movement of the drive means.

Weist die Brennkraftmaschinenbremseinheit einen Bremsnocken mit zumindest zwei Erhebungen auf, kann die Gestaltungsfreiheit eines Bremsmodus erhöht und insbesondere kann ein Bremsvorgang optimiert werden.If the internal combustion engine brake unit has a brake cam with at least two elevations, the freedom of design of a braking mode can be increased and, in particular, a braking process can be optimized.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, dass die Brennkraftmaschinenbremseinheit zumindest ein Steuer- und/oder Regelungsmittel aufweist, das zur Betätigung von zumindest zwei differierenden Brennkraftmaschinenzylindern zugeordneten Gaswechselventilen vorgesehen ist, wodurch wiederum zusätzliche Bauteile, Bauraum, Montageaufwand und Kosten eingespart werden können.In a further embodiment of the invention, it is proposed that the engine brake unit has at least one control and / or regulating means which is provided for actuating gas exchange valves assigned to at least two differentiating engine cylinders, which in turn can save additional components, installation space, assembly costs and costs.

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The description and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Dabei zeigen:

Fig. 1
einen Ausschnitt einer Brennkraftmaschine mit einer erfindungsgemäßen Gaswechselventilbetätigungsvorrichtung schräg von oben,
Fig. 2
eine Gehäuseeinheit einer Brennkraftmaschinenbremseinheit der Gaswechselventilbetätigungsvorrichtung aus Figur 1 mit weiteren darin gelagerten Baueinheiten schräg von oben,
Fig. 3
die Gehäuseeinheit aus Figur 2 in einer Frontansicht,
Fig. 4
einen schematisiert dargestellten Hydraulikplan der Gaswechselventilbetätigungsvorrichtung aus Figur 1,
Fig. 5
einen Querschnitt durch die Gaswechselventilbetätigungsvorrichtung im Bereich eines Nehmerkolbens der Brennkraftmaschinenbremseinheit und
Fig. 6
einen Querschnitt durch die Gaswechselventilbetätigungsvorrichtung im Bereich eines Geberkolbens der Brennkraftmaschinenbremseinheit.
Showing:
Fig. 1
a section of an internal combustion engine with an inventive Gas exchange valve actuator obliquely from above,
Fig. 2
a housing unit of an engine brake unit of the gas exchange valve actuator FIG. 1 with further units mounted therein obliquely from above,
Fig. 3
the housing unit FIG. 2 in a front view,
Fig. 4
a schematically illustrated hydraulic plan of the gas exchange valve actuator FIG. 1 .
Fig. 5
a cross section through the gas exchange valve actuating device in the region of a slave piston of the engine brake unit and
Fig. 6
a cross section through the gas exchange valve actuating device in the region of a master piston of the engine brake unit.

Figur 1 zeigt einen Ausschnitt einer Brennkraftmaschine mit einer erfindungsgemäßen Gaswechselventilbetätigungsvorrichtung schräg von oben. Die Gaswechselventilbetätigungsvorrichtung umfasst einen gabelförmigen Kipphebel 10 zur Übertragung einer Antriebsbewegung von einem auf einer Auslassnockenwelle 28 angeordneten Auslassnocken 25 auf zwei Gaswechselventile 11, 12, die Auslassventile bilden. Der Kipphebel 10 ist auf einer raumfesten Lagerachse 26 schwenkbar gelagert und ist über einen von einem Wälzkörper 27 gebildeten Nockenfolger mit dem Auslassnocken 25 gekoppelt. FIG. 1 shows a section of an internal combustion engine with a gas exchange valve actuator according to the invention obliquely from above. The gas exchange valve actuating device comprises a fork-shaped rocker arm 10 for transmitting a drive movement from an exhaust cam 25 arranged on an exhaust camshaft 28 to two gas exchange valves 11, 12 which form exhaust valves. The rocker arm 10 is pivotally mounted on a fixed bearing axis 26 and is coupled via a cam follower formed by a rolling element 27 with the exhaust cam 25.

Ferner umfasst die Gaswechselventilbetätigungseinheit eine eine Hydraulikeinheit umfassende Brennkraftmaschinenbremseinheit 13, die in einem Bremsmodus antriebstechnisch mit dem Kipphebel 10 gekoppelt ist (Figuren 2 bis 6). Die Brennkraftmaschinenbremseinheit 13 weist eine einstückige Gehäuseeinheit 15 auf, die eine Lagerstelle 16 für einen Nehmerkolben 17, eine Lagerstelle 18 für einen Geberkolben 19 und eine Lagerstelle 20 für ein von einem Kontrollventil gebildetes Ventilmittel 21 aufweist.Furthermore, the gas exchange valve actuating unit comprises an engine brake unit 13 comprising a hydraulic unit, which is drive-coupled to the rocker arm 10 in a braking mode ( characters 2 to 6 ). The engine brake unit 13 has a one-piece housing unit 15, which has a bearing point 16 for a slave piston 17, a bearing point 18 for a master piston 19 and a bearing point 20 for a valve means 21 formed by a control valve.

Der Nehmerkolben 17 ist entlang einer Bewegungsachse 30, der Geberkolben 19 ist entlang einer Bewegungsachse 31 und das Ventilmittel 21 ist entlang einer Bewegungsachse 32 beweglich geführt, wobei die Bewegungsachsen 30, 31, 32 jeweils senkrecht zu einer Achse 29 der Gehäuseeinheit 15 und zueinander verkippt ausgerichtet sind. Die Kolben 17, 19 und das Ventilmittel 21 sind über Hydraulikkanäle 33 der Gehäuseeinheit 15 miteinander verbunden. Ferner weist die Gehäuseeinheit 15 einen Versorgungskanal 34 auf, über den und über ein zentrales, von einem Magnetventil gebildetes Steuermittel 24 das Ventilmittel 21 und die Kolben 17, 19 mit einem Brennkraftmaschinenölkreislauf 35 koppelbar und mit Brennkraftmaschinenöl mit Druck beaufschlagbar sind (Figuren 3 und 4). Das Steuermittel 24 ist zur Betätigung von mehreren differierenden Brennkraftmaschinenzylindern zugeordneten Gaswechselventilen 11, 12 vorgesehen.The slave piston 17 is along a movement axis 30, the master piston 19 is guided along a movement axis 31 and the valve means 21 is movable along a movement axis 32, the movement axes 30, 31, 32 each perpendicular to an axis 29 of the housing unit 15 and tilted towards each other are. The pistons 17, 19 and the valve means 21 are connected to each other via hydraulic channels 33 of the housing unit 15. Furthermore, the housing unit 15 has a supply channel 34, via which and via a central control means 24 formed by a magnetic valve, the valve means 21 and the pistons 17, 19 can be coupled to an engine oil circuit 35 and pressurized with engine oil ( Figures 3 and 4 ). The control means 24 is provided for the actuation of a plurality of gas turbine valves 11, 12 assigned to differing engine cylinders.

Bei deaktiviertem Bremsmodus bzw. bei einem Antriebsmodus der Brennkraftmaschine ist der Nehmerkolben 17 beabstandet zu einem auf der Nockenwelle angeordneten, ein Antriebsmittel der Brennkraftmaschinenbremseinheit 13 bildenden Bremsnocken 23 und der Geberkolben 19 ist beabstandet zu dem Kipphebel 10 angeordnet bzw. die Brennkraftmaschinenbremseinheit 13 ist von der Bewegung des Bremsnockens 23 und der Bewegung des Kipphebels 10 entkoppelt (Figuren 4 bis 6).When the brake mode is deactivated or in a drive mode of the internal combustion engine, the slave piston 17 is spaced from a brake cam 23 forming a drive means of the engine brake unit 13 and the master piston 17 is spaced from the rocker arm 10 or the engine brake unit 13 is in motion of the brake cam 23 and the movement of the rocker arm 10 decoupled ( FIGS. 4 to 6 ).

Wird der Bremsmodus aktiviert, wird das Steuermittel 24 von seiner in Figur 4 dargestellten Sperrstellung mittels eines Elektromagnets 43 entgegen einer Federkraft eines Federelements 44 in seine Durchflussstellung geschaltet. Das Ventilmittel 21 wird mit Druck beaufschlagt und schaltet dadurch bedingt von seiner in Figur 4 dargestellten Sperrstellung entgegen einer Federkraft eines Federelements 45 in seine Durchflussstellung, so dass über ein im Ventilmittel 21 integriertes Rückschlagventil 36 Druckräume 37, 38 der Gehäuseeinheit 15 mit Brennkraftmaschinenöl beaufschlagt werden und der Nehmerkolben 17 in Richtung des Bremsnockens 23 und der Geberkolben 19 in Richtung des Kipphebels 10 belastet werden. Der Nehmerkolben 17 legt sich dadurch bedingt mit einer Gleitoberfläche 39 an den Bremsnocken 23 an, der mehrere Erhebungen aufweist. Anstatt einer Gleitoberfläche 39 könnte die Brennkraftmaschinenbremseinheit 13 auch mit einem einen Wälzkörper umfassenden Nockenfolger 22 ausgebildet sein, wie dies in Figur 5 angedeutet ist.When the braking mode is activated, the control means 24 is moved from its in FIG. 4 illustrated blocking position by means of an electromagnet 43 against a spring force of a Spring element 44 connected in its flow position. The valve means 21 is pressurized and thus switches conditional on its in FIG. 4 illustrated blocking position against a spring force of a spring element 45 in its flow position, so that via a valve means 21 integrated check valve 36 pressure chambers 37, 38 of the housing unit 15 are acted upon by engine oil and the slave piston 17 in the direction of the brake cam 23 and the master piston 19 in the direction of the rocker arm 10 are charged. As a result, the slave piston 17 applies a braking surface 39 to the brake cam 23, which has a plurality of elevations. Instead of a sliding surface 39, the engine brake unit 13 could also be formed with a cam follower 22 comprising a rolling element, as shown in FIG FIG. 5 is indicated.

Der Geberkolben 19 ist teilweise einstückig mit einer hydraulischen Hubbegrenzungseinheit 14 der Brennkraftmaschinenbremseinheit 13 ausgeführt (Figuren 4 und 6). Die Hubbegrenzungseinheit 14 umfasst eine Rückstellfeder 40, die den Geberkolben 19 in die vom Kipphebel 10 abgewandte Richtung belastet und den Geberkolben 19 mit einer dem Kipphebel 10 abgewandten Stirnseite gegen ein auf der dem Kipphebel 10 abgewandten Seite angeordnetes, in Richtung des Kipphebels 10 federbelastetes Verschlussmittel 41 drückt. Das Verschlussmittel 41 verschließt einen Kanal 42 im Geberkolben 19.The master piston 19 is partially embodied in one piece with a hydraulic stroke limiting unit 14 of the engine brake unit 13 ( FIGS. 4 and 6 ). The Hubbegrenzungseinheit 14 includes a return spring 40 which loads the master piston 19 in the direction away from the rocker arm 10 and the master piston 19 facing away with a rocker arm 10 end face against a side facing away from the rocker arm 10 side, spring-loaded in the direction of the rocker arm 10 closure means 41st suppressed. The closure means 41 closes a channel 42 in the master piston 19.

Solange im Bremsmodus der Nehmerkolben 17 auf einem Grundkreis des Bremsnockens 23 gleitet, wird der Geberkolben 19 durch die Rückstellfeder 40 in seiner dem Kipphebel 10 abgewandten Stellung gehalten.As long as in the braking mode, the slave piston 17 slides on a base circle of the brake cam 23, the master piston 19 is held by the return spring 40 in its position facing away from the rocker arm 10.

Wird der Nehmerkolben 17 durch eine der Erhebungen des Bremsnockens 23 in die vom Bremsnocken 23 abgewandte Richtung ausgelenkt, wird der Geberkolben 19 in Richtung des Kipphebels 10 verschoben und legt sich an einen Gelenkkopf 46 einer im Kipphebel 10 befestigten Einstellschraube 47 an (Figur 6). Über die Einstellschraube 47 kann die Brennkraftmaschineneinheit 13 bzw. ein Bremsspiel eingestellt werden. Anschließend wird der Kipphebel 10 über den Geberkolben 19 angetrieben und die Gaswechselventile 11, 12 werden geöffnet. Kurz bevor ein Sollöffnungshub im Bremsmodus erreicht ist, läuft das bis zu diesem Zeitpunkt dem Geberkolben 19 in seiner Bewegung folgende Verschlussmittel 41 in Richtung des Kipphebels 10 an einen Anschlag und der Geberkolben 19 hebt in Richtung des Kipphebels 10 geringfügig vom Verschlussmittel 41 ab, so dass aus dem Druckraum 38 über einen sich zwischen dem Verschlussmittel 41 und dem Geberkolben 19 einstellenden Ringspalt und den Kanal 42 Brennkraftmaschinenöl abströmen kann. Zur Einstellung des Sollöffnungshubs sind sowohl die Lage des Anschlags des Verschlussmittels 41 als auch die Federkraft, mit der das Verschlussmittel 41 gegen den Geberkolben 19 gedrückt wird, einstellbar. Leckageöl und über den Kanal 42 abfließendes Brennkraftmaschinenöl können über das Rückschlagventil 36 nachströmen, so dass sich im Wesentlichen über einen gewissen Zeitraum ein konstanter Öffnungshub einstellt.If the slave piston 17 is deflected by one of the elevations of the brake cam 23 in the direction away from the brake cam 23, the master piston 19 is displaced in the direction of the rocker arm 10 and bears against a joint head 46 of an adjusting screw 47 fastened in the rocker arm 10 (FIG. FIG. 6 ). About the adjusting screw 47, the engine unit 13 and a brake play can be adjusted. Subsequently, the rocker arm 10 is driven via the master piston 19 and the gas exchange valves 11, 12 are opened. Shortly before a Sollöffnungshub is reached in the braking mode, the up to this time the master piston 19 in its movement following closure means 41 in the direction of the rocker arm 10 to a stop and the master piston 19 lifts slightly in the direction of the rocker arm 10 from the closure means 41, so that from the pressure chamber 38 via a self-adjusting between the closure means 41 and the master piston 19 annular gap and the channel 42 engine oil can flow. To set the Sollöffnungshubs both the position of the stop of the closure means 41 and the spring force with which the closure means 41 is pressed against the master piston 19, adjustable. Leakage oil and engine oil flowing off via the channel 42 can flow in via the check valve 36, so that a constant opening stroke is established substantially over a certain period of time.

Wird der Bremsmodus deaktiviert, wird der.Elektromagnet 43 deaktiviert und das Steuermittel 24 wird - angetrieben durch die Federkraft des Federelements 44 - in seine Sperrstellung verschoben. Durch den Druckabfall am Ventilmittel 21 wird dasselbe durch die Federkraft des Federelements 45 ebenfalls in seine Sperrstellung verschoben. In der Sperrstellung des Ventilmittels 21 ist eine Verbindung zwischen dem Brennkraftmaschinenölkreislauf 35 und den Druckräumen 37, 38 unterbrochen. Ferner sind die Druckräume 37, 38 über das Ventilmittel 21 mit einem Tank 48 verbunden, so dass das Brennkraftmaschinenöl aus den Druckräumen 37, 38 abfließen kann. Der Nehmerkolben 17 wird von dem Bremsnocken 23 in seine dem Bremsnocken 23 abgewandte Endstellung verschoben und der Geberkolben 19 wird von der Federkraft der Rückstellfeder 40 in seine dem Kipphebel 10 abgewandte Endstellung verschoben.If the brake mode is deactivated, the solenoid 43 is deactivated and the control means 24 is - driven by the spring force of the spring element 44 - moved into its blocking position. Due to the pressure drop at the valve means 21, the same is also displaced by the spring force of the spring element 45 in its blocking position. In the blocking position of the valve means 21, a connection between the engine oil circuit 35 and the pressure chambers 37, 38 is interrupted. Furthermore, the pressure chambers 37, 38 on the Valve means 21 connected to a tank 48, so that the engine oil from the pressure chambers 37, 38 can flow. The slave piston 17 is displaced by the brake cam 23 in its the brake cam 23 remote end position and the master piston 19 is moved by the spring force of the return spring 40 in its the toggle lever 10 opposite end position.

Bezugszeichenreference numeral

1010
Hebellever
1111
GaswechselventilGas exchange valve
1212
GaswechselventilGas exchange valve
1313
BrennkraftmaschinenbremseinheitInternal combustion engine braking unit
1414
HubbegrenzungseinheitStroke
1515
Gehäuseeinheithousing unit
1616
Lagerstelledepository
1717
Nehmerkolbenslave piston
1818
Lagerstelledepository
1919
Geberkolbenmaster piston
2020
Lagerstelledepository
2121
Ventilmittelvalve means
2222
Nockenfolgercam followers
2323
Bremsnockenbrake cams
2424
Steuer- und/oder RegelungsmittelControl and / or regulating means
2525
Auslassnockenexhaust
2626
Lagerachsebearing axle
2727
Wälzkörperrolling elements
2828
Auslassnockenwelleexhaust
2929
Achseaxis
3030
Bewegungsachsemotion axis
3131
Bewegungsachsemotion axis
3232
Bewegungsachsemotion axis
3333
Hydraulikkanalhydraulic channel
3434
Versorgungskanalsupply channel
3535
BrennkraftmaschinenölkreislaufEngine oil circuit
3636
Rückschlagventilcheck valve
3737
Druckraumpressure chamber
3838
Druckraumpressure chamber
3939
GleitoberflächeSliding surface
4040
RückstellfederReturn spring
4141
Verschlussmittelclosure means
4242
Kanalchannel
4343
Elektromagnetelectromagnet
4444
Federelementspring element
4545
Federelementspring element
4646
Gelenkkopfjoint head
4747
Einstellschraubeadjustment
4848
Tanktank

Claims (9)

  1. Gas exchange valve actuating device, comprising a lever (10) for transmitting a drive motion to at least one gas exchange valve (11, 12) and an internal combustion engine braking unit (13), wherein the internal combustion engine braking unit (13) is coupled to the lever (10) in terms of drive technology in at least one braking mode, wherein the internal combustion engine braking unit (13) comprises a hydraulic unit for transmitting a drive motion to the gas exchange valve (11, 12), wherein the internal combustion engine braking unit (13) comprises a single-piece housing unit (15) which has at least one bearing point (16) for a slave piston (17) and at least one bearing point (18) for a master piston (19) and at least one bearing point (20) for a valve means (21) of the hydraulic unit, wherein the slave piston (17) is movably guided along an axis of motion (30), the master piston (19) is movably guided along an axis of motion (31) and the valve means (21) is movably guided along an axis of motion (32), and wherein the master piston (19) is arranged towards the lever (10),
    characterised in that
    the axes of motion (30, 31, 32) are each arranged perpendicular to an axis (19) of the housing unit (15) and tilted relative to one another, and in that the slave piston (17) is arranged towards a brake cam (23).
  2. Gas exchange valve actuating device according to claim 1,
    characterised in that
    the lever (10) is provided for the actuation of at least two gas exchange valves (11, 12).
  3. Gas exchange valve actuating device according to claim 1 or 2,
    characterised in that
    the internal combustion engine braking unit (13) comprises a hydraulic stroke limiting unit (14).
  4. Gas exchange valve actuating device according to any of the preceding claims,
    characterised in that
    the internal combustion engine braking unit (13) is provided with a cam follower (22) comprising a rolling element.
  5. Gas exchange valve actuating device according to any of the preceding claims,
    the internal combustion engine braking unit (13) is uncoupled from the lever (10) in at least one operating mode.
  6. Gas exchange valve actuating device according to any of the preceding claims,
    the internal combustion engine braking unit (13) is uncoupled from a drive means in at least one operating mode.
  7. Gas exchange valve actuating device according to any of the preceding claims,
    the internal combustion engine braking unit (13) is provided with a brake cam (23) having at least two lobes.
  8. Gas exchange valve actuating device according to any of the preceding claims,
    the internal combustion engine braking unit (13) is provided with at least one open and/or closed loop control means (24) which is provided for the actuation of at least two gas exchange valves (11, 12) assigned to different cylinders of the internal combustion engine.
  9. Internal combustion engine, comprising a gas exchange valve actuating device according to any of the preceding claims.
EP07702753A 2006-01-17 2007-01-13 Gas exchange valve actuating device Active EP1974131B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006002145A DE102006002145A1 (en) 2006-01-17 2006-01-17 Gas exchange valve actuating device
PCT/EP2007/000281 WO2007082700A1 (en) 2006-01-17 2007-01-13 Gas exchange valve actuating device

Publications (2)

Publication Number Publication Date
EP1974131A1 EP1974131A1 (en) 2008-10-01
EP1974131B1 true EP1974131B1 (en) 2011-09-07

Family

ID=37904880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07702753A Active EP1974131B1 (en) 2006-01-17 2007-01-13 Gas exchange valve actuating device

Country Status (7)

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US (1) US7827958B2 (en)
EP (1) EP1974131B1 (en)
JP (1) JP5184372B2 (en)
KR (1) KR101001809B1 (en)
CN (1) CN101371012B (en)
DE (1) DE102006002145A1 (en)
WO (1) WO2007082700A1 (en)

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WO2023143874A1 (en) * 2022-01-31 2023-08-03 Eaton Intelligent Power Limited Integrated rocker for high power engine braking

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Also Published As

Publication number Publication date
CN101371012A (en) 2009-02-18
CN101371012B (en) 2011-10-19
JP2009529615A (en) 2009-08-20
US20090071436A1 (en) 2009-03-19
WO2007082700A1 (en) 2007-07-26
EP1974131A1 (en) 2008-10-01
JP5184372B2 (en) 2013-04-17
DE102006002145A1 (en) 2007-07-19
US7827958B2 (en) 2010-11-09
KR20080079660A (en) 2008-09-01
KR101001809B1 (en) 2010-12-15

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