EP2013450B1 - Switchable cam follower of a valve train assembly of an internal combustion engine - Google Patents
Switchable cam follower of a valve train assembly of an internal combustion engine Download PDFInfo
- Publication number
- EP2013450B1 EP2013450B1 EP07727963.6A EP07727963A EP2013450B1 EP 2013450 B1 EP2013450 B1 EP 2013450B1 EP 07727963 A EP07727963 A EP 07727963A EP 2013450 B1 EP2013450 B1 EP 2013450B1
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- EP
- European Patent Office
- Prior art keywords
- lever
- cam follower
- valve
- arms
- external lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002485 combustion reaction Methods 0.000 title claims description 4
- 230000000295 complement effect Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 239000003562 lightweight material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000012549 training Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- 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
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- 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
- F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
Definitions
- the invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an outer lever which includes an inner lever with its arms, which components pivotally movable relative to each other on a common axis applied to a valve end and the inner lever at an underside at the valve end Plant for a gas exchange valve and at the other end has a complementary surface for storage on a head of a support element, wherein the outer and inner levers are selectively connectable via coupling means to achieve a large valve lift, with decoupling a small or 0-valve stroke can be displayed, at least the outer lever has on its upper side at least one contact surface for a lifting cam and wherein the system is bounded laterally by two projecting from the cam follower in the valve direction guide plates for the gas exchange valve.
- the object of the invention is therefore to provide a switchable drag lever of the aforementioned type, in which the cited disadvantages are eliminated.
- the guide tabs emanate from the underside of the outer lever.
- these tabs should be integrally formed with the inner lever and their outer sides are aligned with outer surfaces of the arms of the outer lever.
- the guide tabs may be formed on the outer lever as separate components and connected by a suitable connection method such as welding, joining, etc. with the outer lever.
- the inner lever and thus the entire drag lever can be made narrower at least at the valve end.
- less space is required, so that a subsequent installation in cramped cylinder head concepts is possible.
- the total mass of the finger lever is lowered. The moment of inertia is reduced compared to previous versions.
- lever parts can be produced by punching and bending, for example, from sheet steel / steel strip, wherein the projecting guide straps can be punched out or bent in one operation.
- the axis with stumps at both ends protrudes beyond the outer surfaces of the arms of the outer lever and that exactly at this projecting area at least one Lost Motion spring as a torsion leg spring in per se known Way is applied.
- This may be another contribution towards “narrowing" the rocker arm on its valve side (as compared to incorporating the lost-motion springs about the axis between outer surfaces of the inner lever and inner sides of the arms of the outer lever or generally within the arms of the outer lever).
- the contact surfaces for the Qundnocken on the outer lever are formed as projecting from the upper sides to the outside collar, which thus represent a sliding surface as a contact partner.
- a roll can be applied here in each case.
- the inner lever may have a role as a contact surface.
- a sliding surface can also be applied here.
- outer lever box-like so that it is connected by a respective double-ended crossbar.
- This training has advantages in terms of stiffness and stability of the outer lever.
- the arms of the outer lever in the region of the other end (support element side) are connected by a cross bar, this can be attacked for the coupling case of a longitudinally extending from the inner lever slide as a coupling agent.
- This slide extends above the complementary surface of the inner lever for the support element.
- the rocker arms parts or at least one of the arms (possibly except for an insert with the complementary surface) of the drag lever can also be made by casting.
- a lightweight material such as plastic, which is optionally fiber or particle reinforced.
- a particularly narrow-built rocker arm is present when dispensed to the aforementioned collar, which protrude from the top of the arms, and thus only the width of the top of the arms is used as Nockenanlauf phenomenon.
- a switchable drag lever 1 of a valve train of an internal combustion engine This consists of a box-like outer lever 2 with two arms 3.
- the arms 3 are connected at a valve-side end 5 and at an opposite other end 9 by a respective cross bow 17, 18.
- the outer lever 2 includes an inner lever 4, wherein both levers 2, 4 are pivotally movable relative to each other. For this purpose, they run on an axis 6, which is applied approximately in the area above a gas exchange valve 8a.
- the axis 6 projects beyond each with a stump 15 outer surfaces 14 of the arms 3 of the outer lever 2. Exactly in this area, each stump 15 can be surrounded by a torsion leg spring o. The like.
- the inner lever 4 has in the region of the valve-side end 5 on a lower side 7 a system 8 for the gas exchange valve 8a.
- a dome-shaped here complementary surface 10 for storage on a head of a support element.
- This complementary surface 10 may be provided in the inner lever 4 is a hydraulically displaceable in at least one direction slide as coupling means.
- the inner lever 4 has a role as a contact surface 19 for a low-lift cams. This is flanked on both sides by sliding surfaces as contact surfaces 11 on upper sides 10a of the arms 3 of the outer lever 2.
- the contact surfaces 11 are formed as outwardly projecting, thin-walled longitudinal collar, which are preferably integrally connected to the outer lever 2. Run against these contact surfaces 11 respectively petitionhubnocken.
- the outer surfaces 14 of the arms 3 of the outer lever 2 are stepped. In the area of the valve-side end 5, they have their smallest thickness. Behind the axis 6, viewed in the direction of the other end 9, the outer surfaces 14 thicken each via a step 16. As out FIG. 2 closer, the respective step 16 encloses the corresponding stump 15 half-shell similar with a small distance.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
Die Erfindung betrifft einen schaltbaren Schlepphebel eines Ventiltriebs einer Brennkraftmaschine, mit einem Außenhebel, der mit seinen Armen einen Innenhebel einschließt, welche Bauteile relativ zueinander verschwenkbeweglich auf einer gemeinsamen, an einem ventilseitigen Ende applizierten Achse verlaufen und der Innenhebel an einer Unterseite an dem ventilseitigen Ende eine Anlage für ein Gaswechselventil sowie am anderen Ende eine Komplementärfläche zur Lagerung auf einem Kopf eines Abstützelements besitzt, wobei Außen- und Innenhebel über Koppelmittel zur Erzielung eines großen Ventilhubes wahlweise miteinander verbindbar sind, wobei bei Entkopplung ein kleiner oder 0-Ventilhub darstellbar ist, wobei zumindest der Außenhebel an seiner Oberseite wenigstens eine Anlauffläche für einen Hubnocken aufweist und wobei die Anlage lateral durch zwei vom Schlepphebel in Ventilrichtung abstehende Führungslaschen für das Gaswechselventil begrenzt ist.The invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an outer lever which includes an inner lever with its arms, which components pivotally movable relative to each other on a common axis applied to a valve end and the inner lever at an underside at the valve end Plant for a gas exchange valve and at the other end has a complementary surface for storage on a head of a support element, wherein the outer and inner levers are selectively connectable via coupling means to achieve a large valve lift, with decoupling a small or 0-valve stroke can be displayed, at least the outer lever has on its upper side at least one contact surface for a lifting cam and wherein the system is bounded laterally by two projecting from the cam follower in the valve direction guide plates for the gas exchange valve.
Derartige Schlepphebel sind der Fachwelt hinreichend bekannt und müssen an dieser Stelle nicht näher beschrieben werden. So offenbaren die Druckschriften
Aufgabe der Erfindung ist es daher, einen schaltbaren Schlepphebel der vorgenannten Art zu schaffen, bei dem die zitierten Nachteile beseitigt sind.The object of the invention is therefore to provide a switchable drag lever of the aforementioned type, in which the cited disadvantages are eliminated.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Führungslaschen von der Unterseite des Außenhebels ausgehen. Vorzugsweise sollen diese Laschen einteilig mit dem Innenhebel ausgebildet sein und deren Außenseiten zu Außenflächen der Arme des Außenhebels fluchten. Gegebenenfalls können die Führungslaschen am Außenhebel auch als separate Bauteile ausgebildet und durch ein geeignetes Verbindungsverfahren wie Schweißen, Fügen etc. mit dem Außenhebel verbunden werden.According to the invention this object is achieved in that the guide tabs emanate from the underside of the outer lever. Preferably, these tabs should be integrally formed with the inner lever and their outer sides are aligned with outer surfaces of the arms of the outer lever. Optionally, the guide tabs may be formed on the outer lever as separate components and connected by a suitable connection method such as welding, joining, etc. with the outer lever.
Aufgrund der Anordnung der Führungslaschen am anderen Bauteil, nämlich am Außenhebel, kann der Innenhebel und somit der gesamte Schlepphebel zumindest am ventilseitigen Ende schmaler ausgebildet werden. Somit wird weniger Bauraum beansprucht, so dass auch ein nachträglicher Einbau in beengte Zylinderkopfkonzepte möglich ist. Außerdem ist die Gesamtmasse des Schlepphebels absenkbar. Das Massenträgheitsmoment ist gegenüber bisherigen Ausführungen verringert.Due to the arrangement of the guide plates on the other component, namely on the outer lever, the inner lever and thus the entire drag lever can be made narrower at least at the valve end. Thus, less space is required, so that a subsequent installation in cramped cylinder head concepts is possible. In addition, the total mass of the finger lever is lowered. The moment of inertia is reduced compared to previous versions.
Da durch den Wegfall der Führungslaschen am Innenhebel die Anlage für das Gaswechselventil quasi "offen" vorliegt, ist eine Bearbeitung dieser Fläche deutlich vereinfacht.Since the elimination of the guide tabs on the inner lever, the system for the gas exchange valve is virtually "open", a processing of this area is much easier.
Zudem ist es vorgeschlagen, die Hebelteile stanz- biegetechnisch bspw. aus Stahlblech / Stahlband zu generieren, wobei die abstehenden Führungslaschen in einem Arbeitsgang mit ausgestanzt bzw. gebogen werden können.In addition, it is proposed that the lever parts can be produced by punching and bending, for example, from sheet steel / steel strip, wherein the projecting guide straps can be punched out or bent in one operation.
Die Achse, auf welcher die Hebelteile relativ zueinander verschwenkbeweglich gelagert sein sollen, verläuft gemäß einer zweckmäßigen Fortbildung der Erfindung unmittelbar oberhalb des Ventilschafts. Gegebenenfalls ist auch eine weiter in Richtung Hebelmitte gerückte Variante denkbar.The axis on which the lever parts are to be mounted pivotably relative to each other, according to an expedient development of the invention immediately above the valve stem. Optionally, a further in the direction of the lever center variant is conceivable.
Zudem kann es zweckmäßig sein, dass die Achse mit beidendigen Stümpfen (insgesamt nur ein Stumpf ist auch denkbar und vorgesehen) über die Außenflächen der Arme des Außenhebels hinaussteht und dass genau an diesem hinausstehenden Bereich wenigstens eine Lost Motion Feder wie eine Drehschenkelfeder in an sich bekannter Art und Weise appliziert ist. Dies kann einen weiteren Beitrag in Richtung "Schmalbau" des Schlepphebels an seiner Ventilseite darstellen (im Vergleich zu einem Einbau der Lost-Motion-Federn um die Achse zwischen Außenflächen des Innenhebels und Innenseiten der Arme des Außenhebels oder generell innerhalb der Arme des Außenhebels).In addition, it may be expedient that the axis with stumps at both ends (in total only one stump is also conceivable and provided) protrudes beyond the outer surfaces of the arms of the outer lever and that exactly at this projecting area at least one Lost Motion spring as a torsion leg spring in per se known Way is applied. This may be another contribution towards "narrowing" the rocker arm on its valve side (as compared to incorporating the lost-motion springs about the axis between outer surfaces of the inner lever and inner sides of the arms of the outer lever or generally within the arms of the outer lever).
Zudem ist es zweckmäßig und vorgesehen, die Außenfläche des jeweiligen Armes dickengestuft auszubilden. Die geringste Dicke liegt somit im Bereich der Ventilseite vor.In addition, it is expedient and provided to form the outer surface of the respective arm graded in thickness. The smallest thickness is thus in the area of the valve side.
Die Anlaufflächen für die Großhubnocken am Außenhebel sind als von dessen Oberseiten nach außen abstehende Kragen ausgebildet, die somit eine Gleitfläche als Kontaktpartner darstellen. Alternativ kann hier jeweils eine Rolle appliziert werden.The contact surfaces for the Großhubnocken on the outer lever are formed as projecting from the upper sides to the outside collar, which thus represent a sliding surface as a contact partner. Alternatively, a roll can be applied here in each case.
Im Falle einer Ausbildung des Schlepphebels als Hubumschalter kann der Innenhebel eine Rolle als Anlauffläche aufweisen. Gegebenenfalls kann hier auch eine Gleitfläche appliziert werden.In the case of a design of the finger lever as Hubumschalter the inner lever may have a role as a contact surface. Optionally, a sliding surface can also be applied here.
Zudem ist es erfindungsgemäß hervorgesehen, den Außenhebel kastenartig auszubilden, so dass er durch je einen beidendigen Querbügel verbunden ist. Diese Ausbildung hat Vorteile hinsichtlich Steifigkeit und Stabilität des Außenhebels. Gegebenenfalls kann auf einen der Querbügel verzichtet werden.In addition, it is provided according to the invention to form the outer lever box-like, so that it is connected by a respective double-ended crossbar. This training has advantages in terms of stiffness and stability of the outer lever. Optionally, can be dispensed with one of the crossbar.
Für den besonders bevorzugten Fall, dass die Arme des Außenhebels im Bereich des anderen Endes (abstützelementseitig) durch einen Querbügel verbunden sind, kann dieser für den Koppelfall von einem längs vom Innenhebel ausgehenden Schieber als Koppelmittel untergriffen werden. Dieser Schieber verläuft oberhalb der Komplementärfläche des Innenhebels für das Abstützelement.For the particularly preferred case that the arms of the outer lever in the region of the other end (support element side) are connected by a cross bar, this can be attacked for the coupling case of a longitudinally extending from the inner lever slide as a coupling agent. This slide extends above the complementary surface of the inner lever for the support element.
Anstelle der bevorzugten Blechausbildung der Schlepphebelteile oder wenigstens eines der Arme (ggf. bis auf ein Einsatzteil mit der Komplementärfläche) kann der Schlepphebel auch gießtechnisch hergestellt sein. Jedoch ist es auch denkbar und vorgesehen, diesen aus einem Leichtbauwerkstoff wie Kunststoff darzustellen, der optional faser- oder partikelverstärkt ist.Instead of the preferred sheet training the rocker arms parts or at least one of the arms (possibly except for an insert with the complementary surface) of the drag lever can also be made by casting. However, it is also conceivable and intended to represent this made of a lightweight material such as plastic, which is optionally fiber or particle reinforced.
Ein besonders schmalbauender Schlepphebel liegt dann vor, wenn auf die vorgenannten Kragen, welche von den Oberseite der Arme abstehen, verzichtet und somit lediglich die Breite der Oberseite der Arme als Nockenanlauffläche benutzt wird.A particularly narrow-built rocker arm is present when dispensed to the aforementioned collar, which protrude from the top of the arms, and thus only the width of the top of the arms is used as Nockenanlauffläche.
Kurze Beschreibung der Zeichnung Die Erfindung ist anhand der Zeichnung näher erläutert.Brief description of the drawing The invention is explained in more detail with reference to the drawing.
Es zeigen:
Figur 1- in einer räumlichen Ansicht einen erfindungsgemäßen Schlepphebel und
Figur 2- den Schlepphebel nach
Figur 1
- FIG. 1
- in a three-dimensional view of a drag lever according to the invention and
- FIG. 2
- the drag lever after
FIG. 1 , partially cut and from a different perspective.
Dargestellt ist ein schaltbarer Schlepphebel 1 eines Ventiltriebs einer Brennkraftmaschine. Dieser besteht aus einem kastenartigen Außenhebel 2 mit zwei Armen 3. Die Arme 3 sind an einem ventilseitigen Ende 5 und an einem gegenüberliegenden anderen Ende 9 durch je einen Querbügel 17, 18 verbunden. Der Außenhebel 2 schließt einen Innenhebel 4 ein, wobei beide Hebel 2, 4 relativ zueinander verschwenkbeweglich sind. Hierzu verlaufen sie auf einer Achse 6, die in etwa im Bereich oberhalb eines Gaswechselventils 8a appliziert ist. Die Achse 6 überragt mit je einem Stumpf 15 Außenflächen 14 der Arme 3 des Außenhebels 2. Genau in diesem Bereich kann jeder Stumpf 15 von einer Drehschenkelfeder o. dgl. als Lost-Motion-Feder in an sich bekannter Art und Weise umschlossen sein.Shown is a
Der Innenhebel 4 hat im Bereich des ventilseitigen Endes 5 an einer Unterseite 7 eine Anlage 8 für das Gaswechselventil 8a. Am gegenüberliegenden anderen Ende 9 hat der Innenhebel 4 eine hier kalottenförmig ausgebildete Komplementärfläche 10 zur Lagerung auf einem Kopf eines Abstützelements. Oberhalb dieser Komplementärfläche 10 kann im Innenhebel 4 ein hydraulisch in wenigstens eine Richtung verlagerbarer Schieber als Koppelmittel vorgesehen sein.The
Wie des Weiteren zu erkennen ist, besitzt der Innenhebel 4 eine Rolle als Anlauffläche 19 für einen Niedrighubnocken. Diese ist beidseitig flankiert von Gleitflächen als Anlaufflächen 11 an Oberseiten 10a der Arme 3 des Außenhebels 2. Die Anlaufflächen 11 sind als nach außen abstehende, dünnwandige Längskragen ausgebildet, die vorzugsweise einteilig mit dem Außenhebel 2 verbunden sind. Gegen diese Anlaufflächen 11 laufen respektive Großhubnocken.As can also be seen, the
Zudem ist dargestellt, dass die Außenflächen 14 der Arme 3 des Außenhebels 2 dickengestuft sind. Im Bereich des ventilseitigen Endes 5 haben sie ihre geringste Dicke. Hinter der Achse 6, in Richtung zum anderen Ende 9 betrachtet, verdicken sich die Außenflächen 14 über je eine Stufe 16. Wie aus
Von Unterseiten 7 der Arme 3 geht im Bereich der Anlage 8 für das Gaswechselventil am Innenhebel 4 je eine Führungslasche 12 für das Gaswechselventil einteilig aus. Aufgrund dieser "Verlagerung" der Führungslaschen 12 vom eigentlichen Bauteil (Innenhebel 4) mit der Anlage 8 "nach außen" kann der Schlepphebel 1 zumindest im Bereich des ventilseitigen Endes 5 deutlich schmaler als bisherig ausgeführte Schlepphebel gebaut werden. Aufgrund dieser insgesamt schmaleren Ausbildung hat er eine geringere Masse und ein geringeres Massenträgheitsmoment. Außerdem kann die somit nunmehr "offenliegende" Anlage 8 an der Unterseite 7 des Innenhebels 4 einfacher feinbearbeitet (schleifen etc.) werden. Hierdurch sind die Fertigungskosten absenkbar.From bottoms 7 of the
- 1) Schlepphebel1) drag lever
- 2) Außenhebel2) outside lever
- 3) Arm3) arm
- 4) Innenhebel4) Inner lever
- 5) ventilseitiges Ende5) valve-side end
- 6) Achse6) axis
- 7) Unterseite7) bottom
- 8) Anlage8) attachment
- 8a)Gaswechselventil8a) gas exchange valve
- 9) anderes Ende9) other end
- 10) Komplementärfläche10) Complementary surface
- 10a) Oberseite10a) top
- 11)Anlauffläche Außenhebel11) contact surface outer lever
- 12)Führungslasche12) guide plate
- 13)Außenseite Führungslasche13) outside guide strap
- 14)Außenfläche Arm14) outer surface arm
- 15)Stumpf15) Stumpf
- 16)Stufe16) Step
- 17)Querbügel17) levers
- 18)Querbügel18) levers
- 19)Anlauffläche Innenhebel19) contact surface inner lever
Claims (10)
- Switchable cam follower (1) of a valve train assembly of an internal combustion engine, with an external lever (2) which encloses an internal lever (4) with its arms (3), which components (2, 4), which can move in a pivoting manner relative to one another, run on a common axis (6) that is applied to a valve side end (5), and the internal lever (4) on an underside (7) on the valve side end (5) possesses a bearing surface (8) for a gas exchange valve (8a) as well as a complementary surface (10) at the other end (9) for mounting on a head of a support element, wherein outer and internal levers (2, 4) can be optionally connected to one another via coupling means to achieve a large valve lift, wherein in the event of decoupling a small or 0 valve lift can be represented, wherein at least the external lever (2) has on its upper side (10a) at least one stop face (11) for an eccentric disk and wherein the bearing surface (8) is delimited laterally by two guidance plates (12) for the gas exchange valve (8a) protruding in the direction of the valve from the cam follower (1), characterized in that the guidance plates (12) run out from the underside (7) of the external lever (2).
- Cam follower according to Claim 1, characterized in that outer sides (13) of the guidance plates (12) are flush with the outer surfaces (14) of the arms (3) of the external lever (2) at the valve side end (5) or run slightly retracted with respect thereto.
- Cam follower according to Claim 1 or 2, characterized in that the guidance plates (12) are formed in one piece with the external lever (2).
- Cam follower according to Claim 1, characterized in that the external lever (2) is represented, as seen in the longitudinal direction, with a graduated width or tapering with respectively minimal overall width at the valve side end (5).
- Cam follower according to Claim 1, characterized in that the axis (6) protrudes through the cam follower (1) in a region above the bearing surface (8) for the gas exchange valve (8a) and protrudes with in each case a stump (15) beyond the outer surfaces (14) of the arms (3) of the external lever (2), wherein at least one stump (15) is enclosed by a swivel pin spring as a lost motion spring.
- Cam follower according to Claim 5, characterized in that the outer surfaces (14) of the arms (3) of the external lever (2) are represented with a smooth surface in the region adjacent to the axis (6), up to their sector facing the other end (9), wherein, in the region of this sector, the outer surfaces (14) extend via a step (16), which axis (6) is enclosed by the step (16) in the manner of a shell.
- Cam follower according to Claim 1, characterized in that the arms (3) of the external lever (2) are connected at one or both ends by a transverse strap (17, 18).
- Cam follower according to Claim 1, characterized in that, in the case of the formation of the internal lever (4) likewise with a stop face (19) for an eccentric disk (low eccentric disk), the stop face (19) is formed as a roller, wherein the stop face (11) of the external lever (2) is present as a sliding surface on the upper sides (10a) of one or both arms (3) or likewise as a respective roller.
- Cam follower according to Claim 8, characterized in that, in the case of the formation of the stop faces (11) on the external lever (2) as sliding surfaces, these, widening the upper sides (10a), protrude as thin-walled longitudinal collars.
- Cam follower according to Claim 1, characterized in that at least one of the components external lever (2)/internal lever (4) is produced at least in sections by punching/bending techniques from steel sheet or a lightweight material such as plastic or plastic which is reinforced with fibers or particles.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74531706P | 2006-04-21 | 2006-04-21 | |
| PCT/EP2007/053495 WO2007122105A1 (en) | 2006-04-21 | 2007-04-11 | Switchable cam follower of a valve train assembly of an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2013450A1 EP2013450A1 (en) | 2009-01-14 |
| EP2013450B1 true EP2013450B1 (en) | 2013-06-19 |
Family
ID=38222161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07727963.6A Ceased EP2013450B1 (en) | 2006-04-21 | 2007-04-11 | Switchable cam follower of a valve train assembly of an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8132551B2 (en) |
| EP (1) | EP2013450B1 (en) |
| WO (1) | WO2007122105A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9938865B2 (en) | 2008-07-22 | 2018-04-10 | Eaton Corporation | Development of a switching roller finger follower for cylinder deactivation in internal combustion engines |
| US9267396B2 (en) | 2010-03-19 | 2016-02-23 | Eaton Corporation | Rocker arm assembly and components therefor |
| US9581058B2 (en) | 2010-08-13 | 2017-02-28 | Eaton Corporation | Development of a switching roller finger follower for cylinder deactivation in internal combustion engines |
| US10415439B2 (en) | 2008-07-22 | 2019-09-17 | Eaton Intelligent Power Limited | Development of a switching roller finger follower for cylinder deactivation in internal combustion engines |
| WO2015134466A1 (en) | 2014-03-03 | 2015-09-11 | Eaton Corporation | Valve actuating device and method of making same |
| US9228454B2 (en) | 2010-03-19 | 2016-01-05 | Eaton Coporation | Systems, methods and devices for rocker arm position sensing |
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| US8584630B2 (en) * | 2010-03-30 | 2013-11-19 | Schaeffler Technologies AG & Co. KG | Switchable roller finger follower assembly |
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| US5544626A (en) * | 1995-03-09 | 1996-08-13 | Ford Motor Company | Finger follower rocker arm with engine valve deactivator |
| US5615647A (en) | 1995-03-28 | 1997-04-01 | Eaton Corporation | Latch assembly for a valve control system |
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| US6668779B2 (en) * | 2002-05-08 | 2003-12-30 | Delphi Technologies, Inc. | Two-step finger follower rocker arm assembly |
| DE10220904B4 (en) * | 2002-05-10 | 2005-04-07 | Meta Motoren- Und Energie-Technik Gmbh | Device for adjusting the stroke of a valve actuated by a camshaft |
| DE10257705A1 (en) * | 2002-12-11 | 2004-06-24 | Ina-Schaeffler Kg | Valve lever for valve train of internal combustion engine has outer lever enclosing inner lever with arms and swiveled away from it when decoupled |
| DE10318295A1 (en) * | 2003-04-23 | 2004-11-11 | Ina-Schaeffler Kg | Drag lever of a valve train of an internal combustion engine |
| DE102004029555A1 (en) | 2004-06-18 | 2006-01-05 | Ina-Schaeffler Kg | Switchable valve lever for valve drive of internal combustion engine, has main and auxiliary levers having receiving sections adjustably aligned at complementary cam base portion of socket coaxial to ring segments at inner side of shank |
| US6925978B1 (en) | 2004-08-24 | 2005-08-09 | Delphi Technologies, Inc. | Two-step roller finger cam follower having angled lock pin |
| US7308872B2 (en) * | 2004-12-30 | 2007-12-18 | Delphi Technologies, Inc. | Method and apparatus for optimized combustion in an internal combustion engine utilizing homogeneous charge compression ignition and variable valve actuation |
| US20070113813A1 (en) * | 2005-11-21 | 2007-05-24 | Lalone Barry G | Two-step rocker arm having roller element cam followers |
| US7484487B2 (en) * | 2005-11-21 | 2009-02-03 | Eaton Corporation | Dual lift rocker arm latch mechanism and actuation arrangement therefor |
-
2007
- 2007-04-11 WO PCT/EP2007/053495 patent/WO2007122105A1/en not_active Ceased
- 2007-04-11 EP EP07727963.6A patent/EP2013450B1/en not_active Ceased
- 2007-04-11 US US12/282,706 patent/US8132551B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US20090064954A1 (en) | 2009-03-12 |
| WO2007122105A1 (en) | 2007-11-01 |
| US8132551B2 (en) | 2012-03-13 |
| EP2013450A1 (en) | 2009-01-14 |
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