DE10330673A1 - Rocker lever for lift-variable valve gear in cylinder head of internal combustion engine has housing and control track are manufactured in one piece by means of powder-metallurgical injection moulding process - Google Patents

Rocker lever for lift-variable valve gear in cylinder head of internal combustion engine has housing and control track are manufactured in one piece by means of powder-metallurgical injection moulding process Download PDF

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Publication number
DE10330673A1
DE10330673A1 DE10330673A DE10330673A DE10330673A1 DE 10330673 A1 DE10330673 A1 DE 10330673A1 DE 10330673 A DE10330673 A DE 10330673A DE 10330673 A DE10330673 A DE 10330673A DE 10330673 A1 DE10330673 A1 DE 10330673A1
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DE
Germany
Prior art keywords
housing
control track
combustion engine
internal combustion
piece
Prior art date
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Ceased
Application number
DE10330673A
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German (de)
Inventor
Michael Allgeier
Torsten Eder
Klaus Dr. Benedikt
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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
Priority claimed from DE10235402A external-priority patent/DE10235402A1/en
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE10330673A priority Critical patent/DE10330673A1/en
Priority to EP04012988A priority patent/EP1496211A1/en
Publication of DE10330673A1 publication Critical patent/DE10330673A1/en
Ceased 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L13/0005—Deactivating valves
    • 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)

Abstract

The rocker lever (1) for a lift-variable valve gear in the cylinder head of an internal combustion engine has a housing (2), a roller element (3) on one side with a rotational point (3') on a cam track, and a control track (4) on an intermediate element for a gas exchange valve. The housing and the control track are manufactured in one piece by means of a powder-metallurgical injection moulding process, and the housing has a reinforcing structure (5).

Description

Die Erfindung betrifft einen Schwenkhebel für einen hubvariablen Ventiltrieb nach dem Hauptpatent (Patentanmeldung DE 102 35 402 ).The invention relates to a pivot lever for a variable-stroke valve drive according to the main patent (patent application DE 102 35 402 ).

In diesem Patent (Patentanmeldung 102 35 402 DE) wird ein Blechgehäuse für einen Schwenkhebel in einem hubvariablen Ventiltrieb eines Zylinderkopfes einer Brennkraftmaschine vorgeschlagen. Der Schwenkhebel weist einerseits ein Rollenelement mit einem Schwingdrehpunkt, der auf der Kulissenbahn einer Kulisse abgestützt ist und andererseits eine Steuerbahn, die auf einem Zwischenelement zu einem Gaswechselventil spielfrei abgestützt ist, auf. Der Schwenkhebel wird zur Hubeinstellung zwischen den Abstützpunkten einerseits von dem Nocken einer Nockenwelle entgegen einer Federkraft geschwenkt und andererseits wird der Schwingdrehpunkt von einer Verstelleinrichtung zur Hubhöhenverstellung parallel zur Kulissenbahn verschoben. Das Gehäuse und die Kulisse sind einstückig aus einem Blech hergestellt.In This patent (patent application 102 35 402 DE) is a sheet metal housing for a Swivel lever in a variable-stroke valve drive of a cylinder head proposed an internal combustion engine. The pivot lever has one hand a roller element with a swinging fulcrum on the slide track supported by a backdrop and on the other hand, a control track on an intermediate element is supported without play to a gas exchange valve on. The swivel lever is used for stroke adjustment between the support points on the one hand by the cam a camshaft pivoted against a spring force and on the other is the swing pivot point of an adjustment for lifting height adjustment moved parallel to the slide track. The case and the scenery are made in one piece made of a sheet metal.

Aufgabe der vorliegenden Erfindung ist es, einen gattunsgemäßen Schwenkhebel aufzuzeigen, dessen Gehäuse leichter als aus Blech und somit für hohe Drehzahlen der Brennkraftmaschine geeignet ist.task It is the object of the present invention to provide a generic pivoting lever to show its case lighter than from sheet metal and thus for high speeds of the internal combustion engine suitable is.

Diese Aufgabe wird durch das Merkmal im kennzeichnenden Teil des Patentanspruches 1 gelöst.These The object is achieved by the feature in the characterizing part of claim 1 solved.

In vorteilhafter Weise kann durch die erfindungsgemäße Ausgestaltung das Gehäuse in Verbindung mit dem pulvermetallurgischen Spritzgießverfahren gewichtsoptimiert ausgelegt werden, so dass beim Betrieb in einer Brennkraftmaschine hohe Drehzahlen erreichbar sind. Die nach Patentanspruch 1 produzierten Schwenkhebelgehäuse können gegenüber der Blechausführung erheblich komplexere Formen aufweisen, da neue Freiheitsgrade der Formgebung möglich sind. Dies führt zu gewichtsoptimierten Geometrien, die bei gleicher Steifigkeit ein geringeres Gewicht aufweisen. Ferner weisen die kostengünstigen Rohteile eine hohe Formgenauigkeit auf, wodurch geringere Bearbeitungszugaben nötig sind. Auch ist gegenüber der Blechausführung eine freiere Werkstoffauswahl möglich.In Advantageously, the housing can be connected by the inventive design Weight-optimized with the powder metallurgical injection molding process be designed so that when operating in an internal combustion engine high speeds are achievable. The produced according to claim 1 Pivoting lever housing can across from the sheet metal version have significantly more complex forms, as new degrees of freedom of Shaping possible are. this leads to to weight-optimized geometries, with the same rigidity have a lower weight. Furthermore, the cost-effective Blanks have a high dimensional accuracy, resulting in lower machining allowances are necessary. Is also opposite the sheet metal version a freer selection of materials possible.

Im Folgenden ist die Erfindung anhand eines bevorzugten Ausführungsbeispieles in einer einzigen Figur näher erläutert.in the The invention is based on a preferred embodiment in a single figure closer explained.

1 zeigt eine dreidimensionale Aufsicht auf einen erfindungsgemäßen Schwenkhebel 1 mit einem Gehäuse 2. Das Gehäuse 2 wird im wesentlichen von einer ersten und einer zweiten, parallel zueinander angeordneten Seitenwange 2a, 2b gebildet, die mit einer, an einem Ende zwischen den Seitenwangen 2a, 2b angeformten Steuerbahn 4 miteinander einen U-förmigen Bügel bilden. Die Steuerbahn 4 weist eine Leerhubkurve 4' und eine Hubkurve 4'' auf. Von der Steuerbahn 4 beabstandet weist das Gehäuse 2 in etwa mittig eine zweite Bohrung 8 und an dem der Steuerbahn gegenüberliegenden Ende eine erste Bohrung 7 auf, die sich durch beide Seitenwangen 2a, 2b erstreckt. In der ersten Bohrung 7 ist ein erstes Rollenelement 3 und in der zweiten Bohrung 8 ist ein zweites Rollenelement 6 drehbar gelagert. Das erste Rollenelement 3 dient zur Verstellung eines Gaswechsel-Ventilhubes, das zweite Rollenelement 6 zur Betätigung eines nicht dargestellten Gaswechselventils. Zwischen den Rollenelementen 3 und 6, verbindet ein Bügel 9 die Seitenwangen 2a und 2b. Dieser Bügel 9 dient zur Versteifung des weitgehend U-förmigen Gehäuses 2. Damit das sehr dünnwandige Gehäuse 2 eine für den Betrieb der Brennkraftmaschine ausreichende Struktursteifigkeit aufweist, weisen die Seitenwangen 2a, 2b, jeweils eine, die Seitenwangenkontur umlaufende erfindungsgemäße erste und zweite Versteifungsstruktur 5, 5' auf. 1 shows a three-dimensional view of a pivot lever according to the invention 1 with a housing 2 , The housing 2 is essentially a first and a second side wall arranged parallel to each other 2a . 2 B formed with one, at one end between the sidewalls 2a . 2 B molded control track 4 together form a U-shaped bracket. The tax train 4 has a Leerhubkurve 4 ' and a lift curve 4 '' on. From the control track 4 spaced apart, the housing 2 in the middle of a second hole 8th and at the opposite end of the control track, a first bore 7 on, extending through both side cheeks 2a . 2 B extends. In the first hole 7 is a first roller element 3 and in the second hole 8th is a second roller element 6 rotatably mounted. The first roller element 3 used to adjust a gas exchange valve lift, the second roller element 6 for actuating a gas exchange valve, not shown. Between the roller elements 3 and 6 , connects a strap 9 the side cheeks 2a and 2 B , This temple 9 serves to stiffen the largely U-shaped housing 2 , So that the very thin-walled housing 2 has a sufficient structural rigidity for the operation of the internal combustion engine, have the side cheeks 2a . 2 B , In each case one, the side cheek contour circumferential first and second stiffening structure according to the invention 5 . 5 ' on.

Die zwei Seitenwangen 2a, 2b sowie die Steuerbahn 4 und der Bügel 9 sind einstückig und materialeinheitlich. Sie sind durch ein pulvermetallurgisches Spritzgießverfahren hergestellt worden, das auch unter der Bezeichnung „Metal Injection Moulding, MIM" bekannt ist. Bei diesem Verfahren werden in der Regel sehr feine Metallpulver mit organischen Bindern zu einer homogenen Masse vermischt. Der Volumenanteil des Metallpulvers beträgt dabei mehr als 50%. Dieses Gemisch kann mit Spritzgießmaschinen in einem Spritzgießprozess zu Formkörpern gespritzt werden, die schon alle typischen geometrischen Merkmale des fertigen Bauteils aufweisen. In einem anschließenden Entbinderungsprozess werden die organischen Binder entfernt. Die porösen Formkörper werden durch Sintern auf die entgültigen geometrischen Eigenschaften verdichtet.The two side cheeks 2a . 2 B as well as the tax train 4 and the temple 9 are one-piece and of uniform material. They have been produced by a powder metallurgical injection molding process, also known as "Metal Injection Molding, MIM." In this process, very fine metal powders are usually mixed with organic binders to form a homogeneous mass This mixture can be injection-molded into moldings in an injection molding process that already have all the typical geometrical features of the finished part, and in a subsequent debinding process, the organic binders are removed by sintering the porous moldings to their final geometric properties ,

Durch dieses pulvermetallurgische Feingießverfahren können weitere Bearbeitungsschritte, ausschließlich einer Feinstbearbeitung wie z.B. der Steuerbahn 4, entfallen. Ferner kann die Metallzusammensetzung sehr exakt an die mechanischen und wärmebehandlungstechnischen Anforderungen angepasst werden. Mit Hilfe einer Wärmebehandlung kann beispielsweise die Oberfläche der Steuerbahn 4 auf die geforderte Härte eingestellt werden.By this powder metallurgical investment casting process further processing steps, excluding a superfinishing such as the control path 4 , omitted. Furthermore, the metal composition can be adapted very precisely to the mechanical and heat treatment requirements. With the help of a heat treatment, for example, the surface of the control track 4 be adjusted to the required hardness.

Mit Hilfe dieses MIM-Verfahrens ist es somit möglich, einen erfindungsgemäßen Schwenkhebel 1 wirtschaftlich zu fertigen, dessen Gewicht unter dem Gewicht eines Schwenkhebels 1 mit einem Blechgehäuse liegt. Aufgrund der Gewichtsreduzierung ist ein Betreib der Brennkraftmaschine mit deutlich höheren Drehzahlen möglich.With the help of this MIM method, it is thus possible, a pivot lever according to the invention 1 economical to manufacture, its weight under the weight of a pivot lever 1 lies with a sheet metal housing. Due to the weight reduction, an operation of the internal combustion engine with significantly higher speeds is possible.

Die Materialstärke liegt im vorliegenden Ausführungsbeispiel zwischen ca. 0,6 mm und 2,5 mm. Sie kann jedoch abhängig von der Belastung des Bauteils auch verringert oder auf mehrere mm verstärkt werden. Das erste Rollenelement 3 und das zweite Rollenelement 6 sind wie für einen Schwenkhebel 1 mit einem Blechgehäuse aus gehärtetem Stahl. Das erste und das zweite Rollenelement 3 und 6 können wälz- oder nadelgelagert sein. Um weiteren mechanischen Anforderungen Genüge zu tun, können die erste und die zweite Seitenwange 2a, 2b auch Versteifungsstrukturen aufweisen, die sich von denen im vorliegenden Ausführungsbeispiel deutlich unterscheiden.The material thickness is in the present embodiment between about 0.6 mm and 2.5 mm. However, depending on the load on the component, it can also be reduced or increased to several mm. The first roller element 3 and the second roller element 6 are like a pivoting lever 1 with a sheet steel housing made of hardened steel. The first and the second roller element 3 and 6 can be roller or needle bearing. To meet further mechanical requirements, the first and second side cheeks can 2a . 2 B also have stiffening structures that differ significantly from those in the present embodiment.

11
Schwenkhebelpivoting lever
22
Gehäusecasing
2a2a
erste Seitenwangefirst side cheek
2b2 B
zweite Seitenwangesecond side cheek
33
Erstes Rollenelementfirst roller element
3'3 '
SchwingdrehpunktSwing fulcrum
44
Steuerbahncontrol track
4'4 '
LeerhubkurveLeerhubkurve
4''4 ''
Hubkurvestroke curve
55
Erste VersteifungsstrukturFirst stiffening structure
5'5 '
Zweite VersteifungsstrukturSecond stiffening structure
66
Zweites Rollenelementsecond roller element
77
Erste BohrungFirst drilling
88th
Zweite BohrungSecond drilling

Claims (1)

Schwenkhebel (1) mit einem Gehäuse (2), für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine nach Patent (Patentanmeldung 102 35 402 DE), der einerseits mit einem Rollenelement (3) mit einem Schwingdrehpunkt (3') auf einer Kulissenbahn einer Kulisse und andererseits mit einer Steuerbahn (4) auf einem Zwischenelement zu einem Gaswechselventil spielfrei abgestützt ist, wobei der Schwenkhebel (1) zur Hubeinstellung zwischen den Abstützpunkten einerseits von einem Nocken einer Nockenwelle entgegen einer Kraft einer Feder gesteuert schwenkbar und andererseits der Schwingdrehpunkt (3') von einer Verstelleinrichtung zur Hubhöhenverstellung parallel zur Kulissenbahn gesteuert verschiebbar ist, dadurch gekennzeichnet, dass das Gehäuse (2) und die Steuerbahn (4) einstückig mittels eines pulvermetallurgischen Spritzgießverfahrens hergestellt sind und das Gehäuse (2) eine Versteifungsstruktur (5) aufweist.Swivel lever ( 1 ) with a housing ( 2 ), for a variable-stroke valve drive in a cylinder head of an internal combustion engine according to patent (patent application 102 35 402 DE), on the one hand with a roller element ( 3 ) with a swinging fulcrum ( 3 ' ) on a slide track of a backdrop and on the other hand with a control track ( 4 ) is supported on an intermediate element to a gas exchange valve without play, wherein the pivot lever ( 1 ) to the stroke adjustment between the support points on the one hand controlled by a cam of a camshaft against a force of a spring pivotally and on the other hand, the oscillating pivot point ( 3 ' ) is slidably controlled by an adjusting device for lifting height adjustment parallel to the slide track, characterized in that the housing ( 2 ) and the control track ( 4 ) are manufactured in one piece by means of a powder metallurgical injection molding process and the housing ( 2 ) a stiffening structure ( 5 ) having.
DE10330673A 2002-08-02 2003-07-08 Rocker lever for lift-variable valve gear in cylinder head of internal combustion engine has housing and control track are manufactured in one piece by means of powder-metallurgical injection moulding process Ceased DE10330673A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10330673A DE10330673A1 (en) 2002-08-02 2003-07-08 Rocker lever for lift-variable valve gear in cylinder head of internal combustion engine has housing and control track are manufactured in one piece by means of powder-metallurgical injection moulding process
EP04012988A EP1496211A1 (en) 2003-07-08 2004-06-02 Rocker arm for a variable lift valve drive

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10235402A DE10235402A1 (en) 2002-08-02 2002-08-02 Swivel lever for a variable stroke valve train
DE10330673A DE10330673A1 (en) 2002-08-02 2003-07-08 Rocker lever for lift-variable valve gear in cylinder head of internal combustion engine has housing and control track are manufactured in one piece by means of powder-metallurgical injection moulding process

Publications (1)

Publication Number Publication Date
DE10330673A1 true DE10330673A1 (en) 2005-02-03

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Application Number Title Priority Date Filing Date
DE10330673A Ceased DE10330673A1 (en) 2002-08-02 2003-07-08 Rocker lever for lift-variable valve gear in cylinder head of internal combustion engine has housing and control track are manufactured in one piece by means of powder-metallurgical injection moulding process

Country Status (1)

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DE (1) DE10330673A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028221A1 (en) * 2004-06-09 2005-12-29 Ina-Schaeffler Kg Highly stressed engine component
DE102005017409A1 (en) * 2005-04-15 2006-10-19 Schaeffler Kg Outer part of a switchable tappet
WO2012107121A1 (en) * 2011-02-10 2012-08-16 Schaeffler Technologies AG & Co. KG Intermediate lever
CN103437850A (en) * 2013-08-14 2013-12-11 重庆长安汽车股份有限公司 Continuously variable valve lift mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028221A1 (en) * 2004-06-09 2005-12-29 Ina-Schaeffler Kg Highly stressed engine component
DE102005017409A1 (en) * 2005-04-15 2006-10-19 Schaeffler Kg Outer part of a switchable tappet
WO2012107121A1 (en) * 2011-02-10 2012-08-16 Schaeffler Technologies AG & Co. KG Intermediate lever
CN103437850A (en) * 2013-08-14 2013-12-11 重庆长安汽车股份有限公司 Continuously variable valve lift mechanism
CN103437850B (en) * 2013-08-14 2015-06-03 重庆长安汽车股份有限公司 Continuously variable valve lift mechanism

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