WO2003042506A1 - Rocker arm in a valve train on an internal combustion engine - Google Patents

Rocker arm in a valve train on an internal combustion engine Download PDF

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Publication number
WO2003042506A1
WO2003042506A1 PCT/EP2002/011944 EP0211944W WO03042506A1 WO 2003042506 A1 WO2003042506 A1 WO 2003042506A1 EP 0211944 W EP0211944 W EP 0211944W WO 03042506 A1 WO03042506 A1 WO 03042506A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever
rocker arm
inner lever
torsion spring
spring
Prior art date
Application number
PCT/EP2002/011944
Other languages
German (de)
French (fr)
Inventor
Michael Haas
Martin Rauch
Bodo RÖRIG
Dieter Schmidt
Jens Artmann
Original Assignee
Ina-Schaeffler Kg
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 DE10155801A external-priority patent/DE10155801A1/en
Application filed by Ina-Schaeffler Kg filed Critical Ina-Schaeffler Kg
Publication of WO2003042506A1 publication Critical patent/WO2003042506A1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • 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

Definitions

  • the invention relates to a rocker arm of a valve train of an internal combustion engine, which can be switched over to different valve strokes for at least one gas exchange valve, with an outer lever, between the arms of which an inner lever which is relatively pivotable relative to this is positioned and both levers can be coupled to one another via coupling means, the outer lever being at its a closed end has a system for a gas exchange valve and the rocker arm has a rotary surface at the opposite end and the inner lever has its pivot center there, via which rotary surface the rocker arm can be supported on a support element, the inner lever having a contact surface for a cam and by at least one on the outer lever in the direction of the gas exchange valve or by a lost motion spring supported on the internal combustion engine in the cam direction or the invention relates to a rocker arm according to the generic terms Features of claim 4. Background of the Invention
  • a generic rocker arm is shown in Figure 4 of DE-OS 27 53 197.
  • Its lost-motion spring is manufactured here as a helical compression spring, which is arranged approximately in the area of a transverse central plane of the rocker arm on its valve side. It acts on one end on an inner lever and is supported on the other side on a shoulder of the outer lever on the valve side.
  • the object of the invention is therefore to provide a rocker arm of the aforementioned type, in which the disadvantages cited are eliminated with simple means.
  • a simple lost motion spring mechanism is to be created, which is of compact construction and does not build up particularly in the valve direction.
  • the lost motion spring is designed as a torsion spring or torsion spring, or this object is achieved by the characterizing features of the independent claim 4, according to which the rotating surface is applied to the inner lever and the compression spring the side of the opposite end runs behind the rotating surface, with a top of the outer lever in this area Cantilever arm extends over the opposite end, on the underside of which the compression spring rests at one end, while at the other end it acts against a shoulder of a face of the inner lever.
  • the subordinate claim 2 relates to the special design and arrangement of the torsion spring as a lost motion spring on the rocker arm. Lateral application is suggested here.
  • This lost-motion spring can be designed so strongly that the generally hydraulically designed support element is prevented from “inflating". Thus, counter-running surfaces for base circle cams on the outer lever or similar stops can be dispensed with.
  • the axis for mounting the torsion spring is in alignment with a pivot axis of the rocker arm or inner or outer lever at the other end. It can also be provided to position diametrically opposed lost motion springs. If necessary, the inner lever can also have a rotating surface for support on the supporting element, the outer lever then being pivotably mounted on the rotating surface thereof. In addition, one leg of the torsion spring can also be supported with respect to the cylinder head. The same applies to the compression spring.
  • the crossbar extending from the inner lever for the other finger of the lost motion spring can be connected to the inner lever in one or more parts.
  • the crossbar with its approach thus forms a top view of the inner lever seen as a whole with the latter a U-like profile, so that its force controllable pivotability in the cam direction is given.
  • the contact surface for the cam in the inner lever is proposed as a roller bearing roller which is not described in more detail. However, a sliding tap is also provided.
  • a particularly compact rocker arm emerges from claim 3.
  • the lost motion spring designed as a torsion spring is intended to run on an axis within the arms of the outer lever, on which axis the inner lever is pivotably mounted via fork arms.
  • the independent claim 4 relates to at least one helical compression spring as a lost motion spring. Seen in the longitudinal direction, this should be positioned behind the rocker arm and act on one end on a cantilever arm or a similar component which starts from the outer lever and on the other end act in the pivoting direction on the inner lever via a shoulder or the like. At this point, however, it is also conceivable to support the compression spring at one end with respect to the cylinder head. At this point, further measures for positioning the compression spring in the rocker arm are also conceivable. So this can be positioned in the region of the closed end of the outer lever and there act in a suitable manner on a contact surface of the inner lever.
  • FIG. 2 shows a section across the rocker arm according to FIG. 1 in the area of its coupling means
  • Figure 3 is a view of a rocker arm according to the invention
  • Figure 4 shows an alternative solution with a lost motion spring designed as a helical compression spring.
  • Figure 1 discloses a switchable rocker arm 1 with an outer lever 2, which includes an inner lever 4 between its arms 3a, b pivotably.
  • the outer lever 2 acts in the region of its one closed end 5 via a system 6 on one end of a gas exchange valve, not shown in the drawing (if necessary, several gas exchange valves can also be acted on simultaneously).
  • the outer lever 2 rests on a head of a preferably hydraulic support element via a rotary surface 8 (not shown in more detail).
  • a cam side of the rotary surface 8 is manufactured as a system for a pivot center 9 of the inner lever 4.
  • the rocker arm 1 according to FIGS. 1, 2 is shown in its coupled state, ie the inner lever 4 is positively connected to the outer lever 2 via coupling means 10 (pins) which cannot be described in more detail.
  • the inner lever 4 furthermore has a contact surface 11, designed as a roller-mounted roller, for a cam.
  • the drag lever 1 has a laterally applied lost motion spring 12, which is designed here as a torsion spring 13 (see FIGS. 1, 2).
  • An axis 14 extends from the side of the arm 3b and can be in alignment with the swivel center 9. The axis 14 is enclosed by the torsion spring 13.
  • a finger 15 extends parallel to the arm 3b and starts from the torsion spring 13 and acts on a driver part 16 of the outer lever 2 in the valve direction. Furthermore, from a top side of the inner lever 4 in the area of the pivot center 9, a transverse web 16a runs parallel to the axis 14 and has a shoulder 17 running axially outside parallel to the finger 15. Another finger 18 of the torsion spring 13 is connected to the extension 17. In the decoupled state of the rocker arm 1, the lost motion spring 12 thus acts on the inner lever 4 in the pivoting direction such that it always follows the cam contour.
  • FIG. 3 shows an alternative arrangement of the lost motion spring 12, which is designed as a torsion spring 13.
  • the pivot center 9 of the inner lever 4 is made as a bolt 19. This is inserted at both ends in the arms 3a, b of the outer lever 2.
  • the torsion spring 13 thus extends around the bolt 19, the inner lever 4 simultaneously being pivotably mounted on the bolt 19 via two fork arms 20a, b adjoining the arms 3a, b of the outer lever 2.
  • the torsion spring 13 has two fingers 21a, b which protrude at the end in the lever direction, which here engage under the inner lever 4 such that it is articulated in the cam direction. At the other end, the torsion spring 13 is fastened to the outer lever 2 by measures not shown in detail.
  • FIG. 4 discloses a possibility of arranging a pressure spring 22 as a lost-motion spring 12 in the rocker arm 1.
  • the rotating surface 8 positioned on an underside of the inner lever 4 so that the outer lever 2 is mounted here on stub axles 23a, b of the inner lever 4.
  • a cantilever arm 24 extends from an upper side of the outer lever 2 and extends behind the opposite end 7 in the longitudinal direction of the lever.
  • the compression spring 22 acts against an underside of the cantilever arm 24, being supported at the other end on a shoulder 25 of an end face 26 of the inner lever 4.
  • the inner lever 4 is excellently guided on the counter-rotating cam in the shutdown mode.
  • Swivel center 0 coupling means 1 contact surface 2 lost motion spring 3 torsion spring 4 axis 5 fingers 6 driver part 6a cross bar 7 extension 8 fingers 9 bolt 0a.b fork arm 1 a, b finger 2 compression spring 3a, b ⁇ stub axle 4 cantilever arm 5 paragraph 6 front 7 Oil supply coupling agent

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

Abstract

A rocker arm (1) in a valve train on an internal combustion engine is disclosed, which may be switched between various valve lifts for at least one gas exchange valve, with an external rocker (2), between the arms (3a,b) of which an inner rocker (4) is positioned which may pivot relative to the above, both levers (2, 4) may be coupled to each other by means of coupling means (10), whereby the outer lever (2) has a bearing (6) for a gas exchange valve at the closed end thereof and the rocker arm has a rotating surface (8) at the opposing end (7) thereof with the pivot point (9) of the inner rocker (4). The rocker arm (1) may be mounted on a support element by means of said rotating surface (8). The inner rocker (4) has a running surface (11) for a cam and is loaded in the direction of the cam by means of a lost-motion spring (12) supported on the internal combustion engine or on the outer rocker (2) facing towards the gas exchange valve. According to the invention, the lost-motion spring (12) is embodied as a torsion spring.

Description

Bezeichnung der Erfindung Name of the invention
Schlepphebel eines Ventiltriebs einer BrennkraftmaschineRocker arm of a valve train of an internal combustion engine
Beschreibungdescription
Gebiet der ErfindungField of the Invention
Die Erfindung betrifft einen Schlepphebel eines Ventiltrieb einer Brennkraftmaschine, der auf unterschiedliche Ventilhübe für wenigstens ein Gaswechselventil umschaltbar ist, mit einem Außenhebel, zwischen dessen Armen ein zu diesem relativ verschwenkbeweglicher Innenhebel positioniert ist und beide Hebel über Koppelmittel miteinander koppelbar sind, wobei der Außenhebel an seinem einen geschlossenen Ende eine Anlage für ein Gaswechselventil aufweist und der Schlepphebel am gegenüberliegenden Ende eine Drehfläche und der Innenhebel dort sein Schwenkzentrum hat, über welche Drehfläche der Schlepphebel auf einem Abstützelement lagerbar ist, wobei der Innenhebel eine Anlauffläche für einen Nocken aufweist und durch wenigstens eine sich am Außenhebel in Richtung zum Gaswechselventil oder durch eine sich auf der Brennkraftmaschine abstützende Lost-Motion-Feder in Nockenrichtung beaufschlagt ist bzw. betrifft die Erfindung einen Schlepphebel nach den ober- begriffsbildenden Merkmalen des Anspruchs 4. Hintergrund der ErfindungThe invention relates to a rocker arm of a valve train of an internal combustion engine, which can be switched over to different valve strokes for at least one gas exchange valve, with an outer lever, between the arms of which an inner lever which is relatively pivotable relative to this is positioned and both levers can be coupled to one another via coupling means, the outer lever being at its a closed end has a system for a gas exchange valve and the rocker arm has a rotary surface at the opposite end and the inner lever has its pivot center there, via which rotary surface the rocker arm can be supported on a support element, the inner lever having a contact surface for a cam and by at least one on the outer lever in the direction of the gas exchange valve or by a lost motion spring supported on the internal combustion engine in the cam direction or the invention relates to a rocker arm according to the generic terms Features of claim 4. Background of the Invention
Ein gattungsgemäßer Schlepphebel geht aus Figur 4 der DE-OS 27 53 197 hervor. Dessen Lost-Motion-Feder ist hier als Schraubendruckfeder gefertigt, die in etwa im Bereich einer Quermittelebene des Schlepphebels an seiner Ventilseite angeordnet ist. Sie wirkt einenends auf einen Innenhebel und ist anderenends an einem Absatz des Außenhebels ventilseitig abgestützt.A generic rocker arm is shown in Figure 4 of DE-OS 27 53 197. Its lost-motion spring is manufactured here as a helical compression spring, which is arranged approximately in the area of a transverse central plane of the rocker arm on its valve side. It acts on one end on an inner lever and is supported on the other side on a shoulder of the outer lever on the valve side.
Nachteilig ist es bei dem vorbekannten schaltbaren Schlepphebel, daß dieser aufgrund der untenliegenden Schraubendruckfeder als Lost-Motion-Feder in diesem Bereich relativ viel Bauraum benötigt. Möglicherweise muß bei einer nachträglichen Implementierung des Schlepphebels in an sich vorhandene Zylinderköpfe dort eine aufwändige Designänderung realisiert werden.It is a disadvantage of the known switchable rocker arm that it requires a relatively large amount of installation space in this area due to the helical compression spring located below it as a lost motion spring. If the rocker arm is subsequently implemented in cylinder heads that are in themselves, a complex design change may have to be implemented there.
Aufgabe der ErfindungObject of the invention
Aufgabe der Erfindung ist es daher, einen Schlepphebel der vorgenannten Gattung zu schaffen, bei welchem die zitierten Nachteile mit einfachen Mitteln beseitigt sind. Insbesondere soll ein einfacher Lost-Motion-Federmechanismus geschaffen werden, der kompakt aufgebaut ist und insbesondere in Ventilrichtung nicht hoch baut.The object of the invention is therefore to provide a rocker arm of the aforementioned type, in which the disadvantages cited are eliminated with simple means. In particular, a simple lost motion spring mechanism is to be created, which is of compact construction and does not build up particularly in the valve direction.
Zusammenfassung der ErfindungSummary of the invention
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Lost-Motion- Feder als Drehfeder oder Torsionsfeder ausgebildet ist, bzw. wird diese Aufgabe durch die kennzeichnenden Merkmale des nebengeordneten Anspruchs 4 gelöst, nach denen die Drehfläche am Innenhebel appliziert ist und die Druck- feder auf der Seite des gegenüberliegenden Endes hinter der Drehfläche verläuft, wobei von einer Oberseite des Außenhebels in diesem Bereich ein Kragarm sich über das gegenüberliegende Ende hinweg erstreckt, an dessen Unterseite die Druckfeder einenends anliegt, wobei sie anderenends gegen einen Absatz einer Stirnseite des Innenhebels wirkt.According to the invention, this object is achieved in that the lost motion spring is designed as a torsion spring or torsion spring, or this object is achieved by the characterizing features of the independent claim 4, according to which the rotating surface is applied to the inner lever and the compression spring the side of the opposite end runs behind the rotating surface, with a top of the outer lever in this area Cantilever arm extends over the opposite end, on the underside of which the compression spring rests at one end, while at the other end it acts against a shoulder of a face of the inner lever.
Somit liegt ein Lost-Motion-Federmechanismus vor, bei welchem die vorhergehend genannten Nachteile mit einfachen Mitteln beseitigt sind. Der gesamte Schlepphebel benötigt durch die vorzugsweise in diesen komplett integrierte Lost-Motion-Feder (Drehfeder oder Druckfeder) keinen oder keinen signifikant größeren Bauraum als bisher ausgeführte Schlepphebel. Aufwändige Ände- rungen an bisher ausgeführten Zylinderköpfen erübrigen sich somit in aller Regel.There is thus a lost motion spring mechanism in which the above-mentioned disadvantages are eliminated with simple means. Due to the lost motion spring (torsion spring or compression spring), which is preferably completely integrated in this, the entire rocker arm requires no or no significantly larger installation space than the rocker arms previously used. As a rule, there is no need for time-consuming changes to cylinder heads.
Der untergeordnete Anspruch 2 bezieht sich auf die spezielle Ausbildung und Anordnung der Drehfeder als Lost-Motion-Feder am Schlepphebel. Hier ist eine seitliche Applizierung vorgeschlagen. Diese Lost-Motion-Feder kann so stark ausgelegt werden, daß ein „Aufpumpen" des in aller Regel hydraulisch ausgelegten Abstützelements verhindert wird. Somit kann auf Gegenlaufflächen für Grundkreisnocken am Außenhebel o. ä. Anschläge verzichtet werden.The subordinate claim 2 relates to the special design and arrangement of the torsion spring as a lost motion spring on the rocker arm. Lateral application is suggested here. This lost-motion spring can be designed so strongly that the generally hydraulically designed support element is prevented from "inflating". Thus, counter-running surfaces for base circle cams on the outer lever or similar stops can be dispensed with.
Denkbar ist es, daß die Achse zur Lagerung der Drehfeder in Flucht mit einer Schwenkachse des Schlepphebels bzw. Innen- oder Außenhebels am anderen Ende ist. Auch kann es vorgesehen sein, sich diametral gegenüberliegende Lost-Motion-Fedem zu positionieren. Gegebenenfalls kann auch der Innenhebel eine Drehfläche zur Abstützung auf dem Abstützelement besitzen, wobei dann auf dessen Drehfläche der Außenhebel verschwenkbeweglich gelagert ist. Zudem kann ein Schenkel der Torsionsfeder auch gegenüber dem Zylinderkopf abgestützt werden. Gleiches gilt für die Druckfeder.It is conceivable that the axis for mounting the torsion spring is in alignment with a pivot axis of the rocker arm or inner or outer lever at the other end. It can also be provided to position diametrically opposed lost motion springs. If necessary, the inner lever can also have a rotating surface for support on the supporting element, the outer lever then being pivotably mounted on the rotating surface thereof. In addition, one leg of the torsion spring can also be supported with respect to the cylinder head. The same applies to the compression spring.
Der vom Innenhebel ausgehende Quersteg für den weiteren Finger der Lost- Motion-Feder kann ein- oder mehrteilig mit dem Innenhebel verbunden sein.The crossbar extending from the inner lever for the other finger of the lost motion spring can be connected to the inner lever in one or more parts.
Der Quersteg mit seinem Ansatz bildet somit in Draufsicht auf den Innenhebel gesehen insgesamt mit letzterem ein U-ähnliches Profil, wodurch somit seine kräftemäßig gut beherrschbare Verschwenkbarkeit in Nockenrichtung gegeben ist.The crossbar with its approach thus forms a top view of the inner lever seen as a whole with the latter a U-like profile, so that its force controllable pivotability in the cam direction is given.
Die Anlauffläche für den Nocken im Innenhebel ist als nicht näher ausgeführte wälzgelagerte Rolle vorgeschlagen. Ein Gleitabgriff ist jedoch auch vorgesehen.The contact surface for the cam in the inner lever is proposed as a roller bearing roller which is not described in more detail. However, a sliding tap is also provided.
Ein besonders kompakt bauender Schlepphebel geht aus Anspruch 3 hervor. Dieser bezieht sich auf eine Lösung, bei der wahlweise der Innen- oder Außenhebel die Drehfläche zur Abstützung auf dem Abstützelement hat. Dabei soll erfindungsgemäß die als Drehfeder ausgebildete Lost-Motion-Feder auf einer Achse innerhalb der Arme des Außenhebels verlaufen, auf welcher Achse der Innenhebel über Gabelarme verschwenkbeweglich gelagert ist.A particularly compact rocker arm emerges from claim 3. This refers to a solution in which either the inner or outer lever has the rotating surface for support on the support element. According to the invention, the lost motion spring designed as a torsion spring is intended to run on an axis within the arms of the outer lever, on which axis the inner lever is pivotably mounted via fork arms.
Der nebengeordnete Anspruch 4 betrifft wenigstens eine Schraubendruckfeder als Lost-Motion-Feder. Diese soll in Längsrichtung gesehen hinter dem Schlepphebel positioniert sein und einenends auf einen Kragarm oder ein ähnliches Bauteil einwirken, welches vom Außenhebel ausgeht und anderenends in Verschwenkrichtung auf den Innenhebel über einen Absatz o. ä. einwirken. Denkbar ist es an dieser Stelle jedoch auch, die Druckfeder einenends gegenüber dem Zylinderkopf abzustützen. Auch sind an dieser Stelle weitere Maßnahmen einer Positionierung der Druckfeder im Schlepphebel denkbar. So kann diese im Bereich des geschlossenen Endes des Außenhebels positioniert sein und dort auf eine Anlagefläche des Innenhebels in geeigneter Art und Weise einwirken.The independent claim 4 relates to at least one helical compression spring as a lost motion spring. Seen in the longitudinal direction, this should be positioned behind the rocker arm and act on one end on a cantilever arm or a similar component which starts from the outer lever and on the other end act in the pivoting direction on the inner lever via a shoulder or the like. At this point, however, it is also conceivable to support the compression spring at one end with respect to the cylinder head. At this point, further measures for positioning the compression spring in the rocker arm are also conceivable. So this can be positioned in the region of the closed end of the outer lever and there act in a suitable manner on a contact surface of the inner lever.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Die Erfindung ist anhand der Zeichnung näher erläutert. Es zeigen: Figur 1 in einer räumlichen Ansicht einen erfindungsgemäßen Schlepphebel mit Drehfeder als Lost-Motion-Feder;The invention is explained in more detail with reference to the drawing. Show it: 1 shows a rocker arm according to the invention with a torsion spring as a lost motion spring in a three-dimensional view;
Figur 2 einen Schnitt quer durch den Schlepphebel nach Figur 1 im Be- reich dessen Koppelmittel;FIG. 2 shows a section across the rocker arm according to FIG. 1 in the area of its coupling means;
Figur 3 eine Ansicht auf einen erfindungsgemäßen Schlepphebel mitFigure 3 is a view of a rocker arm according to the invention
Drehfeder im Bereich des Schwenkzentrums undTorsion spring in the area of the swivel center and
Figur 4 eine alternative Lösung mit einer als Schraubendruckfeder ausgebildeten Lost-Motion-Feder.Figure 4 shows an alternative solution with a lost motion spring designed as a helical compression spring.
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Figur 1 offenbart einen schaltbaren Schlepphebel 1 mit einem Außenhebel 2, der zwischen seinen Armen 3a, b verschwenkbeweglich einen Innenhebel 4 einschließt. Der Außenhebel 2 wirkt im Bereich seines einen geschlossenen Endes 5 über eine Anlage 6 auf ein Ende eines zeichnerisch nicht dargestellten Gaswechselventils ein (ggf. können auch mehrere Gaswechselventile gleichzeitig beaufschlagt werden).Figure 1 discloses a switchable rocker arm 1 with an outer lever 2, which includes an inner lever 4 between its arms 3a, b pivotably. The outer lever 2 acts in the region of its one closed end 5 via a system 6 on one end of a gas exchange valve, not shown in the drawing (if necessary, several gas exchange valves can also be acted on simultaneously).
An seinem gegenüberliegenden Ende 7 liegt der Außenhebel 2 über eine nicht näher dargestellte Drehfläche 8 auf einem Kopf eines vorzugsweise hydraulischen Abstützelements auf. Eine Nockenseite der Drehfläche 8 ist als Anlage für ein Schwenkzentrum 9 des Innenhebels 4 gefertigt.At its opposite end 7, the outer lever 2 rests on a head of a preferably hydraulic support element via a rotary surface 8 (not shown in more detail). A cam side of the rotary surface 8 is manufactured as a system for a pivot center 9 of the inner lever 4.
Der Schlepphebel 1 nach den Figuren 1 , 2 ist in seinem gekoppelten Zustand dargestellt, d.h. der Innenhebel 4 ist über nicht näher zu beschreibende Koppelmittel 10 (Pins) formschlüssig mit dem Außenhebel 2 verbunden. Wie zu erkennen, hat der Innenhebel 4 des weiteren eine als wälzgelagerte Rolle ausgebildete Anlauffläche 11 für einen Nocken. Zur Sicherung einer permanenten Anlage des Innenhebels 4 im entkoppelten Zustand vom Außenhebel 2 (Abschaltmodus) am Nocken hat der Schlepphebel 1 eine seitlich applizierte Lost-Motion-Feder 12, die hier als Drehfeder 13 aus- gebildet ist (siehe Figuren 1 , 2). Dabei geht seitlich vom Arm 3b eine Achse 14 aus, die in Flucht mit dem Schwenkzentrum 9 sein kann. Die Achse 14 ist von der Drehfeder 13 umschlossen. Parallel zum Arm 3b erstreckt sich von der Drehfeder 13 ausgehend ein Finger 15, welcher auf ein Mitnehmerteil 16 des Außenhebels 2 in Ventilrichtung einwirkt. Des weiteren geht von einer Ober- seite des Innenhebels 4 im Bereich des Schwenkzentrums 9 ein parallel zur Achse 14 verlaufender Quersteg 16a aus, der axial außen einen parallel zum Finger 15 verlaufenden Ansatz 17 hat. Mit dem Ansatz 17 ist ein weiterer Finger 18 der Drehfeder 13 verbunden. Im entkoppelten Zustand des Schlepphebels 1 beaufschlagt somit die Lost-Motion-Feder 12 den Innenhebel 4 in Ver- Schwenkrichtung derart, daß dieser stets der Nockenkontur folgt.The rocker arm 1 according to FIGS. 1, 2 is shown in its coupled state, ie the inner lever 4 is positively connected to the outer lever 2 via coupling means 10 (pins) which cannot be described in more detail. As can be seen, the inner lever 4 furthermore has a contact surface 11, designed as a roller-mounted roller, for a cam. To ensure permanent engagement of the inner lever 4 in the decoupled state from the outer lever 2 (switch-off mode) on the cam, the drag lever 1 has a laterally applied lost motion spring 12, which is designed here as a torsion spring 13 (see FIGS. 1, 2). An axis 14 extends from the side of the arm 3b and can be in alignment with the swivel center 9. The axis 14 is enclosed by the torsion spring 13. A finger 15 extends parallel to the arm 3b and starts from the torsion spring 13 and acts on a driver part 16 of the outer lever 2 in the valve direction. Furthermore, from a top side of the inner lever 4 in the area of the pivot center 9, a transverse web 16a runs parallel to the axis 14 and has a shoulder 17 running axially outside parallel to the finger 15. Another finger 18 of the torsion spring 13 is connected to the extension 17. In the decoupled state of the rocker arm 1, the lost motion spring 12 thus acts on the inner lever 4 in the pivoting direction such that it always follows the cam contour.
Figur 3 zeigt eine alternative Anordnung der als Drehfeder 13 ausgebildeten Lost-Motion-Feder 12. Diese ist vollkommen innerhalb des Schlepphebels 1 positioniert. Dabei ist das Schwenkzentrum 9 des Innenhebels 4 als Bolzen 19 gefertigt. Dieser ist beidendig in die Arme 3a, b des Außenhebels 2 gesteckt. Um den Bolzen 19 herum verläuft somit die Drehfeder 13, wobei gleichzeitig der Innenhebel 4 über zwei an die Arme 3a, b des Außenhebels 2 angrenzende Gabelarme 20a, b auf dem Bolzen 19 verschwenkbeweglich gelagert ist. Die Drehfeder 13 hat zwei stirnseitig in Hebelrichtung abstehende Finger 21a, b, welche hier den Innenhebel 4 so untergreifen, daß dieser in Nockenrichtung angelenkt ist. Am anderen Ende ist die Drehfeder 13 über nicht näher gezeigte Maßnahmen am Außenhebel 2 befestigt.FIG. 3 shows an alternative arrangement of the lost motion spring 12, which is designed as a torsion spring 13. This is positioned completely within the rocker arm 1. The pivot center 9 of the inner lever 4 is made as a bolt 19. This is inserted at both ends in the arms 3a, b of the outer lever 2. The torsion spring 13 thus extends around the bolt 19, the inner lever 4 simultaneously being pivotably mounted on the bolt 19 via two fork arms 20a, b adjoining the arms 3a, b of the outer lever 2. The torsion spring 13 has two fingers 21a, b which protrude at the end in the lever direction, which here engage under the inner lever 4 such that it is articulated in the cam direction. At the other end, the torsion spring 13 is fastened to the outer lever 2 by measures not shown in detail.
Schließlich offenbart Figur 4 eine Möglichkeit einer Anordnung einer Druckfe- der 22 als Lost-Motion-Feder 12 im Schlepphebel 1. Dabei ist die Drehfläche 8 an einer Unterseite des Innenhebels 4 positioniert, so daß der Außenhebel 2 hier auf Achsstümpfen 23a, b des Innenhebels 4 gelagert ist.Finally, FIG. 4 discloses a possibility of arranging a pressure spring 22 as a lost-motion spring 12 in the rocker arm 1. The rotating surface 8 positioned on an underside of the inner lever 4 so that the outer lever 2 is mounted here on stub axles 23a, b of the inner lever 4.
Von einer Oberseite des Außenhebels 2 geht ein Kragarm 24 weg, welcher sich in Hebellängsrichtung hinter das gegenüberliegende Ende 7 erstreckt. Gegen eine Unterseite des Kragarms 24 wirkt die Druckfeder 22, wobei sie sich anderenends an einem Absatz 25 einer Stirnseite 26 des Innenhebels 4 abstützt. Somit ist der Innenhebel 4 im Abschaltmodus hervorragend am gegenlaufenden Nocken geführt. A cantilever arm 24 extends from an upper side of the outer lever 2 and extends behind the opposite end 7 in the longitudinal direction of the lever. The compression spring 22 acts against an underside of the cantilever arm 24, being supported at the other end on a shoulder 25 of an end face 26 of the inner lever 4. Thus, the inner lever 4 is excellently guided on the counter-rotating cam in the shutdown mode.
BezugszahlenlisteLIST OF REFERENCE NUMBERS
Schlepphebelcam follower
Außenhebel a,b ArmExternal lever a, b arm
Innenhebelinternal lever
EndeThe End
Anlageinvestment
EndeThe End
Drehflächesurface of revolution
Schwenkzentrum 0 Koppelmittel 1 Anlauffläche 2 Lost-Motion-Feder 3 Drehfeder 4 Achse 5 Finger 6 Mitnehmerteil 6a Quersteg 7 Ansatz 8 Finger 9 Bolzen 0a.b Gabelarm 1 a,b Finger 2 Druckfeder 3a,b ι Achsstumpf 4 Kragarm 5 Absatz 6 Stirnseite 7 Olzuführung Koppelmittel Swivel center 0 coupling means 1 contact surface 2 lost motion spring 3 torsion spring 4 axis 5 fingers 6 driver part 6a cross bar 7 extension 8 fingers 9 bolt 0a.b fork arm 1 a, b finger 2 compression spring 3a, b ι stub axle 4 cantilever arm 5 paragraph 6 front 7 Oil supply coupling agent

Claims

Patentansprüche claims
1. Schlepphebel (1 ) eines Ventiltrieb einer Brennkraftmaschine, der auf unterschiedliche Ventilhübe für wenigstens ein Gaswechselventil umschaltbar ist, mit einem Außenhebel (2), zwischen dessen Armen (3a, b) ein zu diesem relativ verschwenkbeweglicher Innenhebel (4) positioniert ist und beide Hebel (2, 4) über Koppelmittel (10) miteinander koppelbar sind, wobei der Außenhebel (2) an seinem einen geschlossenen Ende (5) eine Anlage (6) für ein Gaswechselventil aufweist und der Schlepphebel (1 ) am gegenüberlie- genden Ende (7) eine Drehfläche (8) und der Innenhebel (4) dort sein1. rocker arm (1) of a valve train of an internal combustion engine, which can be switched to different valve strokes for at least one gas exchange valve, with an outer lever (2), between the arms (3a, b) of which an inner lever (4) which is relatively pivotable is positioned, and both Levers (2, 4) can be coupled to one another via coupling means (10), the outer lever (2) having a system (6) for a gas exchange valve at its one closed end (5) and the rocker arm (1) at the opposite end ( 7) a rotating surface (8) and the inner lever (4) there
Schwenkzentrum (9) hat, über welche Drehfläche (8) der Schlepphebel (1 ) auf einem Abstützelement lagerbar ist, wobei der Innenhebel (4) eine Anlauffläche (11 ) für einen Nocken aufweist und durch wenigstens eine sich am Außenhebel (2) in Richtung zum Gaswechselventil oder durch eine sich auf der Brennkraftmaschine abstützende Lost-Motion-Feder (12) in Nockenrichtung beaufschlagt ist, dadurch gekennzeichnet, daß die Lost-Motion- Feder (12) als Drehfeder (13) oder Torsionsfeder ausgebildet ist.Has a pivoting center (9) over which rotary surface (8) the rocker arm (1) can be supported on a support element, the inner lever (4) having a contact surface (11) for a cam and at least one on the outer lever (2) in the direction to the gas exchange valve or by a lost motion spring (12) supported on the internal combustion engine in the cam direction, characterized in that the lost motion spring (12) is designed as a torsion spring (13) or torsion spring.
2. Schlepphebel nach Anspruch 1 , bei dem die Drehfläche (8) am Außenhebel (2) verläuft, dadurch gekennzeichnet, daß auf einer Nockenseite der2. rocker arm according to claim 1, wherein the rotary surface (8) on the outer lever (2), characterized in that on a cam side of the
Drehfläche (8) der Innenhebel (4) mit seinem Schwenkzentrum (9) abgestützt ist, wobei wenigstens eines der Arme (3a, b) des Außenhebels (2) am gegenüberliegenden Ende (7) orthogonal von einer Achse (14) überragt ist, welche Achse (14) von der Drehfeder (13) zumindest abschnittsweise um- schlössen ist, wobei ein Finger (15) der Drehfeder (13) parallel zum angrenzenden Arm (3b) des Außenhebels (2) verläuft und auf ein mit diesem verbundenes Mitnehmerteil (16) wie einen Absatz einwirkt und ein weiterer Finger (18) der Drehfeder (13) mit einer Seite eines ebenfalls parallel zum angrenzenden Arm (3b) verlaufenden Ansatzes (17) zusammenwirkt, der mit einem Quersteg (16a) verbunden ist, welcher vom Innenhebel (4) oder von einer Nockenseite des Innenhebels (4) im Bereich des gegenüberliegenden Endes (7) ausgeht (Fig. 1 , 2).Rotating surface (8) of the inner lever (4) is supported with its pivot center (9), at least one of the arms (3a, b) of the outer lever (2) at the opposite end (7) being orthogonally protruded by an axis (14) which Axis (14) is at least partially enclosed by the torsion spring (13), a finger (15) of the torsion spring (13) running parallel to the adjacent arm (3b) of the outer lever (2) and on a driver part (16 ) acts as a shoulder and another finger (18) of the torsion spring (13) interacts with one side of a shoulder (17) which also runs parallel to the adjacent arm (3b) and which is connected to a crossbar (16a) which is connected by the inner lever ( 4) or starts from a cam side of the inner lever (4) in the region of the opposite end (7) (Fig. 1, 2).
3. Schlepphebel nach Anspruch 1 , dadurch gekennzeichnet, daß das Schwenkzentrum (9) des Innenhebels (4) als Bolzen ausgebildet ist, der beidendig in die Arme (3a, b) des Außenhebels (2) gesteckt ist, wobei der Innenhebel (4) über zwei an die Arme (3a, b) angrenzende Gabelarme (20a, b) auf dem Bolzen gelagert ist, zwischen denen der Bolzen von der Drehfeder (13) umschlossen ist, wobei die Drehfeder (13) zwei stirnseitig in Hebelrichtung abstehende Finger (21a, b) hat, welche im Verschwenksinn den Innenhebel (4) unter- bzw. in diesen eingreifen und wobei die Drehfeder (13) zumindest mittelbar an ihrem den Fingern (21a, b) entfernten Ende gegenüber dem Außenhebel (2) abgestützt ist. (Fig. 3).3. rocker arm according to claim 1, characterized in that the pivot center (9) of the inner lever (4) is designed as a bolt which is inserted at both ends in the arms (3a, b) of the outer lever (2), the inner lever (4) Two fork arms (20a, b) adjoining the arms (3a, b) are mounted on the bolt, between which the bolt is enclosed by the torsion spring (13), the torsion spring (13) having two fingers (21a , b) which engages under or into the inner lever (4) in the direction of pivoting and wherein the torsion spring (13) is supported at least indirectly at its end remote from the fingers (21a, b) with respect to the outer lever (2). (Fig. 3).
4. Schlepphebel nach dem Obergriff des Anspruchs 1 , bei dem die Lost- Motion-Feder (12) als wenigstens eine Druckfeder (22) wie eine Schraubendruckfeder ausgebildet ist, die einenends am Außenhebel (2) abgestützt ist und anderenends auf den Innenhebel (4) einwirkt, dadurch gekennzeichnet, daß die Drehfläche (8) am Innenhebel (4) appliziert ist und die Druckfeder (22) auf der Seite des gegenüberliegenden Endes (7) hinter der4. finger lever according to the upper handle of claim 1, wherein the lost motion spring (12) is designed as at least one compression spring (22) as a helical compression spring, which is supported on one end on the outer lever (2) and the other end on the inner lever (4th ) acts, characterized in that the rotary surface (8) is applied to the inner lever (4) and the compression spring (22) on the side of the opposite end (7) behind the
Drehfläche (8) verläuft, wobei von einer Oberseite des Außenhebels (2) in diesem Bereich ein Kragarm (24) sich über das gegenüberliegende Ende (7) hinweg erstreckt, an dessen Unterseite die Druckfeder (22) einenends anliegt, wobei sie anderenends gegen einen Absatz (25) einer Stirnseite (26) des Innenhebels (4) wirkt (Fig. 4). Rotating surface (8) extends, with a cantilever arm (24) extending from an upper side of the outer lever (2) in this area over the opposite end (7), on the underside of which the compression spring (22) rests at one end, while at the other end against one Paragraph (25) of an end face (26) of the inner lever (4) acts (Fig. 4).
PCT/EP2002/011944 2001-11-14 2002-10-25 Rocker arm in a valve train on an internal combustion engine WO2003042506A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10155801A DE10155801A1 (en) 2001-11-14 2001-11-14 Rocker arm used in a valve gear of an internal combustion engine comprises an external rocker having an inner rocker positioned between its arms which pivot relative to each other
DE10155801.5 2001-11-14
US33560201P 2001-11-15 2001-11-15
US60/335,602 2001-11-15

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WO2003042506A1 true WO2003042506A1 (en) 2003-05-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017004179A1 (en) * 2015-06-29 2017-01-05 Eaton Corporation Switching rocker arm for internal exhaust gas recirculation with simple latch control
EP3167167A4 (en) * 2014-07-07 2018-04-11 Eaton Corporation Switching rocker arm assembly having spring retaining configuration
EP3649328B1 (en) * 2017-07-10 2021-12-29 Eaton Intelligent Power Limited Switching roller finger follower for valvetrain

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Publication number Priority date Publication date Assignee Title
DE2753197A1 (en) 1976-12-15 1978-06-22 Eaton Corp VALVE CONTROL DEVICE
US5584267A (en) * 1995-12-20 1996-12-17 Eaton Corporation Latchable rocker arm mounting
US5653198A (en) * 1996-01-16 1997-08-05 Ford Motor Company Finger follower rocker arm system
US5682848A (en) * 1996-03-22 1997-11-04 Eaton Corporation Engine valve control system using a latchable rocker arm activated by a solenoid mechanism
US6321705B1 (en) * 1999-10-15 2001-11-27 Delphi Technologies, Inc. Roller finger follower for valve deactivation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2753197A1 (en) 1976-12-15 1978-06-22 Eaton Corp VALVE CONTROL DEVICE
US5584267A (en) * 1995-12-20 1996-12-17 Eaton Corporation Latchable rocker arm mounting
US5653198A (en) * 1996-01-16 1997-08-05 Ford Motor Company Finger follower rocker arm system
US5682848A (en) * 1996-03-22 1997-11-04 Eaton Corporation Engine valve control system using a latchable rocker arm activated by a solenoid mechanism
US6321705B1 (en) * 1999-10-15 2001-11-27 Delphi Technologies, Inc. Roller finger follower for valve deactivation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3167167A4 (en) * 2014-07-07 2018-04-11 Eaton Corporation Switching rocker arm assembly having spring retaining configuration
US10215062B2 (en) 2014-07-07 2019-02-26 Eaton Intelligent Power Limited Switching rocker arm assembly having spring retaining configuration
WO2017004179A1 (en) * 2015-06-29 2017-01-05 Eaton Corporation Switching rocker arm for internal exhaust gas recirculation with simple latch control
EP3649328B1 (en) * 2017-07-10 2021-12-29 Eaton Intelligent Power Limited Switching roller finger follower for valvetrain

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