EP2233704A1 - Rocker arm holder for a valve drive of a combustion engine - Google Patents
Rocker arm holder for a valve drive of a combustion engine Download PDFInfo
- Publication number
- EP2233704A1 EP2233704A1 EP10154529A EP10154529A EP2233704A1 EP 2233704 A1 EP2233704 A1 EP 2233704A1 EP 10154529 A EP10154529 A EP 10154529A EP 10154529 A EP10154529 A EP 10154529A EP 2233704 A1 EP2233704 A1 EP 2233704A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- kipphebelträger
- carrier
- rocker arm
- carrier strip
- 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.)
- Granted
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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
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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
- F01L1/181—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
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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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
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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
- F01L2001/188—Fulcrums at upper surface
Definitions
- the invention relates to a Kipphebelonia for a valve train of an internal combustion engine.
- the Kipphebellie comprises at least one attachable in the engine carrier bar with hollow cylindrical receptacles for therein insertable pivot bearings, which are supported on the one hand on the carrier strip and on the other hand formed for pivotally mounting gas exchange valves actuated rocker arms.
- Such a rocker arm carrier is known to simplify the assembly of a valve train with centrally mounted rocker arms that are not guided with bearing eyes on a rigid axis, but are supported with a joint socket on rod ends of pendulum mounted in the engine pivot bearings. It is particularly useful in favor of a low number of components when a single rocker arm carrier is provided for all gas exchange valves of a cylinder head of the internal combustion engine.
- Kipphebel known for a four-valve internal combustion engine.
- the Kipphebel have two carrier bars, of which one carrier bar all intake valves and the other carrier bar is associated with all exhaust valves of the cylinder head.
- a disadvantage of these urgeformten Kipphebelnumn however, the high production costs, resulting on the one hand from the complex casting process and on the other hand from the considerable extent of machining reworking of the solid material for the production of casting technology not representable functional surfaces.
- the invention is therefore based on the object to further develop a Kipphebelfar of the type mentioned in that the Kipphebelfarin with unchanged functionality at the lowest possible cost is mass produced.
- the carrier strip should be formed as a thin-walled forming part.
- a steel material suitable for forming is to be preferred, while hydroforming, such as hydroforming, or, as provided for in a development of the invention, thermoforming of the carrier strip of sheet metal material is suitable as a suitable method.
- thermoforming such as hydroforming, or, as provided for in a development of the invention
- thermoforming of the carrier strip of sheet metal material is suitable as a suitable method.
- ie cast version allows the reshaped carrier bar not only a significant reduction of the machine cycle time, but also the scope of the machining reworking to produce the required surface quality at the functional surfaces. In the most cost-effective ideal case Such a rework is no longer necessary, so that the support bar can be completely formed without cutting to their finished contour.
- the Kipphebel here in the event that the Kipphebel once transformed according to the invention to replace the aforementioned aluminum die casting for all gas exchange valves of the four-valve engine, it is contemplated that the Kipphebel here two spaced-apart extending carrier strips and cross struts that connect the carrier strips together.
- a Kipphebel here is expediently assembled from the separately produced carrier strips and the crossbars, which are materially connected to the carrier strips, for example by welding or gluing, or positively, for example by means of punctiform or linear clinching (clinching) or punch rivets.
- the cross struts like the carrier strips made of formed sheet material.
- the support bar should include a extending over the length cavity for hydraulic fluid and at least one inlet for connection of the cavity to the pressure medium supply of the internal combustion engine.
- the function of the hydraulic fluid-carrying cavity is not limited to the hydraulic fluid supply of the valve lash adjusters, but may also consist of a distribution of the hydraulic fluid to lubrication / cooling points, which are adjacent to the carrier strip arranged valve train components and connected via an outlet in the carrier strip to the cavity are. These are, in particular, hydrodynamic sliding bearing points of the camshafts arranged between the carrier strips and the gas exchange valves for actuating the rocker arms.
- the carrier bar may be provided with spray holes which direct the hydraulic fluid in the form of a jet from the cavity to the cams formed as rollers or sliding surfaces of the rocker arms.
- the above-mentioned hydraulic valve clearance compensation elements are expediently known mass-produced parts which are used as so-called plug-in elements in centrally mounted rocker arms or end-mounted rocker arms.
- Such compensating elements always comprise a compensating piston and a housing in which the compensating piston is mounted longitudinally movably with a tight leakage gap fit to form a height-adjustable high-pressure chamber.
- the hollow cylindrical compensating piston serves as the high-pressure space immediately upstream hydraulic fluid reservoir with which the high-pressure chamber communicates via a check valve.
- the hydraulic fluid transfer between the exterior of the compensating element and the hydraulic fluid reservoir is usually via bead or trough-shaped recesses in the compensating piston supporting contact surface on the tilting or swing levers or, as in the present case, the Kipphebeluza.
- these recesses are in an additionally inserted intermediate disc made of steel, which prevents depression of the annular end face of the balance piston in the relatively low-strength aluminum material.
- the formed carrier strip - cold forming steel material is particularly preferred - can be dispensed with such an intermediate disc by a leading the hydraulic fluid cavity and the immediate frontal support of the balance piston serving inner surface of the support bar is provided with said recesses ,
- the recesses can of course be omitted.
- the carrier strip is composed of a strip lower part and a strip upper part.
- the recordings for the pivot bearing to be formed as projections on the last lower part be, while the last upper part of the support of the pivot bearing is used.
- the last part and the last part upper part are designed to be trough-shaped and interleaved.
- the stiffening border of a tub can also be replaced by integrally formed stiffening ribs or ribs.
- the carrier strip can be composed both in one piece and in several parts.
- the composite formed from the last upper part and the lower part of the strip can be non-positively, for example by means of a press fit, or cohesively, for example by welding, or even form-fitting, for example by means of the o.g. fürsetzyoggens or by edge-side beading of the strip parts are generated.
- the strip lower parts together with the crossbars as a one-piece component, for example, from a single punched plate by deep drawing produce.
- this option is available alternatively or optionally also for the top parts.
- the Kipphebeln, the pivot bearing and the rocker arm by means of connecting elements, which extend firstly between the Kipphebeln and the pivot bearings and the other between the pivot bearings and the rocker arms, be held captive together and form a mountable in the engine assembly.
- the assembly may also be already provided with the necessary screwing and / or sealing elements.
- FIG. 1 and 2 is one of a Kipphebelani 1, rocker arms 2 with cam rollers 3 and - here hidden by the rocker arms 2 - pivot bearings assembled assembly for a valve train of a four-cylinder internal combustion engine in four-valve technology in perspective plan view and bottom view shown.
- the assembly is intended to be screwed above camshafts and inlet and outlet side gas exchange valves as part of a cylinder head, not shown, of the internal combustion engine with this.
- the Kipphebelarni 1 consists of two mutually parallel and spaced-apart carrier strips 4 and 5, of which a carrier strip 4 of the inlet side and the other carrier strip 5 is assigned to the outlet side of the cylinder head.
- the carrier strips 4, 5 are different from each other and designed with respect to the positioning of the pivot bearing so that the Kipphebelprese associated with a cylinder spaced from each other and are offset from one another transversely to the cylinder head, so that whose valve actuating surfaces 6 correspond to a so-called rotated valve star.
- each of the carrier strips 4, 5 composed of a last part 7 and 8 and a strip top 9 and 10 respectively.
- the carrier strips 4, 5 are connected to each other by transverse struts 11, the end portions of which are fixed by means of a clinching also known as clinching on the strip bottom parts 7, 8.
- This joining technique can also be provided as a linear or punctiform attachment of the strip upper parts 9, 10 to the strip bottom parts 7, 8.
- the four transverse struts 11 on a tubular central portion 12 which serves as an outer guide and transverse support of injectors of the internal combustion engine.
- each carrier strip 4, 5 has a width of about 45 mm with a substantially uniform wall thickness of a few millimeters, here about 2.5 mm.
- Each of a cylinder of the engine associated Kipphebelpase are bordered by formations 13 in the strip bottom parts 7, 8, which are designed in the present embodiment is substantially cuboid.
- the known compensation elements 15 comprise a cup-shaped housing 16, which is guided in the hollow cylinder receptacles 17 in the carrier strip 5 on the outer periphery, and a hollow cylindrical compensating piston 18 which is mounted longitudinally movably on the inner circumference of the housing 16 to form a high-pressure chamber 19.
- the check valve 20 When the check valve 20 is open, the high-pressure chamber 19 communicates directly with a hydraulic medium reservoir 21 extending in the interior of the compensating piston 18, which in turn is connected to the cavity 14 via a hydraulic medium passage in the form of a trough-shaped recess 22 on the inner surface of the upper part 10 bordering the cavity 14.
- the receptacles 17 are formed for the compensation elements 15 each as a hollow cylindrical projection on the last part 8.
- Each compensating element 15 is on the one hand supported on the carrier strip 5 by the outer end face of the compensating piston 18 abuts directly against the inner surface of the strip upper part 10, and on the other hand has a spherical condyle 23 on the housing 16, which in conjunction with a dome-shaped socket 24 on the rocker arm 2 serves to the pivotal mounting.
- the Kipphebelani 1, the compensating elements 15 and the formed of sheet metal rocker arm 2 are held captive to form the mountable in the cylinder head assembly by means of fasteners together.
- the connecting elements are on the one hand on the outer circumference of the housing 16 extending snap ring 25 which abuts with expanded compensating element 15 on a receptacle 17 delimiting bevel 26 and so holds the compensating element 15 in the receptacle 17, and on the other to an am Rocker arm 2 fastened retaining clip 27, which extends over the socket 24 and engages in an undercut 28 above the condyle 23 freely pivotally to hold the rocker arm 2 on the compensation element.
- the cavity 14 is largely hydraulically sealed in the region of the stepped formed joint fit of the upper part of the strip 10 and lower strip part 8 with respect to the surroundings of the carrier strip 5.
- a sealing means inserted in the joint fitting can also be provided for this purpose.
- the connection of the cavity 14 to the pressure medium supply of the internal combustion engine takes place in each case via an inlet 29 in the form of a punched opening at one end of the strip lower parts 7, 8 (see also FIG. 2 ), which rest with five flat contact surfaces 30 on the formations 13 on corresponding footprints in the cylinder head hydraulically largely sealing.
- a riser from the pressure medium supply of the internal combustion engine opens, while the remaining contact surfaces are provided with hydraulic fluid channels, each with an outlet 31 in the form of punched openings in the strip bottom parts 7, 8 (see also FIG. 2 ) and forward hydraulic fluid to slide bearings of the associated camshaft.
- the carrier strips 4, 5 - apart from the receptacles 17 for the pivot bearing 15 - would be substantially parallelepiped-shaped and their footprints in the cylinder head facing undersides largely flat.
- An unchanged installation situation of the rocker arm carrier in the cylinder head would then result from the fact that the footprints in the cylinder head are raised by the amount of omitted formations.
- any intermediate solutions with respect to the height of the formations 13 are possible with appropriately adapted connection construction, ie height of the footprints in the cylinder head.
- the Kipphebeluza 1 a plurality of screw-on points 32. These are each formed by one of the screw guide, hollow cylindrical Anformung 33 in the upper part of the strip 9 and 10 and an aligned, punched opening 34 in the contact surfaces 30 of the strip lower parts 7 and 8 respectively.
- a vent of the hydraulic fluid-carrying cavity 14 is provided, this can be done via a defined leakage of the cavity 14.
- Such a leak can be provided in the region of the joint fit between the upper part of the strip 9 or 10 and lower part of the strip 7 or 8 or on the screwing on the outer surface of the strip upper part 9 or 10 in the region of the screw support or in the form of a throttle bore in the support strip 4, 5 ,
- a centering can be provided in the manner of a dowel pin connection for the precise positioning of the rocker arm carrier 1 in the cylinder head.
- This can be suitably designed so that the two end, diagonally opposite formations 13 of the strip lower parts 7, 8 are provided with integrally formed cylindrical projections as a passport set, which engage in corresponding fitting holes in the cylinder head.
Abstract
Description
Die Erfindung betrifft einen Kipphebelträger für einen Ventiltrieb einer Brennkraftmaschine. Der Kipphebelträger umfasst zumindest eine in der Brennkraftmaschine befestigbare Trägerleiste mit hohlzylindrischen Aufnahmen für darin einsteckbare Schwenklager, die einerseits an der Trägerleiste abgestützt und andererseits zur schwenkbeweglichen Lagerung von Gaswechselventile betätigenden Kipphebeln ausgebildet sind.The invention relates to a Kipphebelträger for a valve train of an internal combustion engine. The Kipphebelträger comprises at least one attachable in the engine carrier bar with hollow cylindrical receptacles for therein insertable pivot bearings, which are supported on the one hand on the carrier strip and on the other hand formed for pivotally mounting gas exchange valves actuated rocker arms.
Ein derartiger Kipphebelträger vereinfacht bekanntlich die Montage eines Ventiltriebs mit mittig gelagerten Kipphebeln, die nicht mit Lageraugen auf einer starren Achse geführt, sondern mit einer Gelenkpfanne auf Gelenkköpfen von hängend in der Brennkraftmaschine angeordneten Schwenklagern abgestützt sind. Dabei ist es zugunsten einer geringen Bauteileanzahl besonders zweckmäßig, wenn ein einziger Kipphebelträger für sämtliche Gaswechselventile eines Zylinderkopfs der Brennkraftmaschine vorgesehen ist.Such a rocker arm carrier is known to simplify the assembly of a valve train with centrally mounted rocker arms that are not guided with bearing eyes on a rigid axis, but are supported with a joint socket on rod ends of pendulum mounted in the engine pivot bearings. It is particularly useful in favor of a low number of components when a single rocker arm carrier is provided for all gas exchange valves of a cylinder head of the internal combustion engine.
Aus der
Der Erfindung liegt daher die Aufgabe zu Grunde, einen Kipphebelträger der eingangs genannten Art dahingehend fortzubilden, dass der Kipphebelträger bei unveränderter Funktionalität zu möglichst niedrigen Kosten großseriengerecht herstellbar ist.The invention is therefore based on the object to further develop a Kipphebelträger of the type mentioned in that the Kipphebelträger with unchanged functionality at the lowest possible cost is mass produced.
Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen des Anspruchs 1, während bevorzugte Weiterbildungen und Ausgestaltungen der Erfindung den Unteransprüchen entnehmbar sind. Demnach soll die Trägerleiste als dünnwandiges Umformteil ausgebildet sein. Aus Gründen der Bauteilsteifigkeit ist ein für die Umformung geeigneter Stahlwerkstoff zu bevorzugen, während als geeignetes Verfahren insbesondere Hydroforming wie Innenhochdruck-Umformen oder, wie es in einer Weiterbildung der Erfindung vorgesehen ist, das Tiefziehen der Trägerleiste aus Blechwerkstoff in Frage kommt. Im Gegensatz zu einer urgeformten, d.h. gegossenen Ausführung ermöglicht die umgeformte Trägerleiste nicht nur eine erhebliche Reduzierung der maschinellen Taktzeit, sondern auch des Umfangs der spanenden Nacharbeit zur Erzeugung der geforderten Oberflächenqualität an den Funktionsflächen. Im kostengünstigsten Idealfall ist eine solche Nacharbeit überhaupt nicht mehr erforderlich, so dass die Trägerleiste vollständig spanlos zu ihrer Fertigkontur umgeformt werden kann.The solution to this problem arises from the features of claim 1, while preferred developments and refinements of the invention are the dependent claims can be removed. Accordingly, the carrier strip should be formed as a thin-walled forming part. For reasons of component stiffness, a steel material suitable for forming is to be preferred, while hydroforming, such as hydroforming, or, as provided for in a development of the invention, thermoforming of the carrier strip of sheet metal material is suitable as a suitable method. In contrast to a urgeformten, ie cast version allows the reshaped carrier bar not only a significant reduction of the machine cycle time, but also the scope of the machining reworking to produce the required surface quality at the functional surfaces. In the most cost-effective ideal case Such a rework is no longer necessary, so that the support bar can be completely formed without cutting to their finished contour.
Typischerweise für den Fall, dass der erfindungsgemäß umgeformte Kipphebelträger das eingangs erwähnte Aluminiumdruckgussteil für sämtliche Gaswechselventile der Vierventil-Brennkraftmaschine substituieren soll, ist es vorgesehen, dass der Kipphebelträger zwei voneinander beabstandet verlaufende Trägerleisten und Querstreben umfasst, die die Trägerleisten miteinander verbinden. Ein derartiger Kipphebelträger ist zweckmäßigerweise aus den separat voneinander hergestellten Trägerleisten und den Querstreben zusammengebaut, die mit den Trägerleisten stoffschlüssig, beispielsweise mittels Schweißen oder Kleben, oder formschlüssig, beispielsweise mittels punkt- oder linienförmigem Durchsetzfügen (Clinchen) oder Stanznieten verbunden sind. Die Querstreben können wie die Trägerleisten aus umgeformtem Blechwerkstoff bestehen.Typically, in the event that the Kipphebelträger transformed according to the invention to replace the aforementioned aluminum die casting for all gas exchange valves of the four-valve engine, it is contemplated that the Kipphebelträger two spaced-apart extending carrier strips and cross struts that connect the carrier strips together. Such a Kipphebelträger is expediently assembled from the separately produced carrier strips and the crossbars, which are materially connected to the carrier strips, for example by welding or gluing, or positively, for example by means of punctiform or linear clinching (clinching) or punch rivets. The cross struts, like the carrier strips made of formed sheet material.
Ebenfalls typischerweise für den vorgenannten Fall, bei dem als Schwenklager hydraulische Ventilspielausgleichselemente zum Einsatz kommen, soll die Trägerleiste einen sich über deren Länge erstreckenden Hohlraum für Hydraulikmittel einschließen und zumindest einen Einlass zum Anschluss des Hohlraums an die Druckmittelversorgung der Brennkraftmaschine aufweisen. Die Funktion des Hydraulikmittel führenden Hohlraums ist jedoch nicht auf die Hydraulikmittelversorgung der Ventilspielausgleichselemente beschränkt, sondern kann auch in einer Verteilung des Hydraulikmittels zu Schmier-/Kühlstellen bestehen, die zu benachbart zur Trägerleiste angeordneten Ventiltriebsbauteilen gehören und über einen Auslass in der Trägerleiste an den Hohlraum angeschlossen sind. Hierbei handelt es sich insbesondere um hydrodynamische Gleitlagerstellen der zwischen den Trägerleisten und den Gaswechselventilen angeordneten Nockenwellen zur Betätigung der Kipphebel. Unabhängig davon, ob hydraulische oder mechanische Ventilspielausgleichselemente vorgesehen sind, kann zudem die Trägerleiste mit Spritzbohrungen versehen sein, die das Hydraulikmittel in Form eines Strahls aus dem Hohlraum zu den als Rollen oder Gleitflächen ausgebildeten Nockenanlaufflächen der Kipphebel leiten.Also typically for the aforementioned case, in which are used as a pivot bearing hydraulic valve clearance compensation elements, the support bar should include a extending over the length cavity for hydraulic fluid and at least one inlet for connection of the cavity to the pressure medium supply of the internal combustion engine. However, the function of the hydraulic fluid-carrying cavity is not limited to the hydraulic fluid supply of the valve lash adjusters, but may also consist of a distribution of the hydraulic fluid to lubrication / cooling points, which are adjacent to the carrier strip arranged valve train components and connected via an outlet in the carrier strip to the cavity are. These are, in particular, hydrodynamic sliding bearing points of the camshafts arranged between the carrier strips and the gas exchange valves for actuating the rocker arms. Regardless of whether hydraulic or mechanical valve lash adjusters are provided, also the carrier bar may be provided with spray holes which direct the hydraulic fluid in the form of a jet from the cavity to the cams formed as rollers or sliding surfaces of the rocker arms.
Bei den vorgenannten hydraulischen Ventilspielausgleichselementen handelt es sich zweckmäßigerweise um bekannte Großserienteile, die als sogenannte Einsteckelemente in mittig gelagerten Kipphebeln oder endseitig gelagerten Schwinghebeln Verwendung finden. Derartige Ausgleichselemente umfassen stets einen Ausgleichskolben und ein Gehäuse, in dem der Ausgleichskolben mit einer engen Leckspaltpassung zur Bildung eines höhenveränderlichen Hochdruckraums längsbeweglich gelagert ist. Der hohlzylindrische Ausgleichskolben dient als dem Hochdruckraum unmittelbar vorgelagertes Hydraulikmittelreservoir, mit dem der Hochdruckraum über ein Rückschlagventil kommuniziert. Der Hydraulikmittelübertritt zwischen dem Äußeren des Ausgleichselements und dem Hydraulikmittelreservoir erfolgt üblicherweise über sicken- oder muldenförmige Ausnehmungen in der den Ausgleichskolben abstützenden Kontaktfläche an den Kipp- oder Schwinghebeln oder, wie im vorliegenden Fall, am Kipphebelträger. Im Falle der bekannten Kipphebelträger aus Aluminium befinden sich diese Ausnehmungen in einer zusätzlich eingelegten Zwischenscheibe aus Stahl, die ein Eindrücken der ringförmigen Stirnfläche des Ausgleichskolbens in den vergleichsweise niedrigfesten Aluminiumwerkstoff verhindert.The above-mentioned hydraulic valve clearance compensation elements are expediently known mass-produced parts which are used as so-called plug-in elements in centrally mounted rocker arms or end-mounted rocker arms. Such compensating elements always comprise a compensating piston and a housing in which the compensating piston is mounted longitudinally movably with a tight leakage gap fit to form a height-adjustable high-pressure chamber. The hollow cylindrical compensating piston serves as the high-pressure space immediately upstream hydraulic fluid reservoir with which the high-pressure chamber communicates via a check valve. The hydraulic fluid transfer between the exterior of the compensating element and the hydraulic fluid reservoir is usually via bead or trough-shaped recesses in the compensating piston supporting contact surface on the tilting or swing levers or, as in the present case, the Kipphebelträger. In the case of the known aluminum rocker arm, these recesses are in an additionally inserted intermediate disc made of steel, which prevents depression of the annular end face of the balance piston in the relatively low-strength aluminum material.
Bei geeigneter Werkstoffauswahl der umgeformten Trägerleiste - besonders bevorzugt ist mit großem Tiefziehverhältnis kalt umformbarer Stahlwerkstoff - kann jedoch auf eine solche Zwischenscheibe verzichtet werden, indem eine den Hydraulikmittel führenden Hohlraum begrenzende und der unmittelbaren stirnseitigen Abstützung der Ausgleichskolben dienende Innenfläche der Trägerleiste mit den genannten Ausnehmungen versehen ist. Im Falle der Verwendung mechanischer Ventilspielausgleichselemente, die als Ausführung mit festem, einstellbarem oder auch automatisch nachstellendem Ventilspiel bekannt sind, können die Ausnehmungen selbstverständlich entfallen.With a suitable choice of material of the formed carrier strip - cold forming steel material is particularly preferred - can be dispensed with such an intermediate disc by a leading the hydraulic fluid cavity and the immediate frontal support of the balance piston serving inner surface of the support bar is provided with said recesses , In the case of using mechanical valve clearance compensation elements, which are known as a design with fixed, adjustable or automatically adjusting valve clearance, the recesses can of course be omitted.
In einer insbesondere für tiefgezogene Trägerleisten zweckmäßigen Ausgestaltung der Erfindung ist es vorgesehen, dass die Trägerleiste aus einem Leistenunterteil und einem Leistenoberteil zusammengesetzt ist. Dabei sollen die Aufnahmen für die Schwenklager als Vorsprünge am Leistenunterteil angeformt sein, während das Leistenoberteil der Abstützung der Schwenklager dient. Im Hinblick auf einen besonders steifen und gegebenenfalls hydraulisch leicht abzudichtenden Verbund der Trägerleistenteile sollen außerdem das Leistenunterteil und das Leistenoberteil wannenförmig ausgebildet und ineinander verschachtelt sein. Neben dieser geometrischen Ausgestaltung stehen dem Konstrukteur selbstverständlich eine Vielzahl anderer Optionen offen. Um nur einige zu nennen, kann die versteifende Umrandung einer Wanne auch durch angeformte Versteifungsrippen oder- sicken ersetzt werden. Außerdem kann die Trägerleiste im Falle des Umformens mittels des erwähnten Hydroformings sowohl einteilig als auch aus mehreren Teilen zusammengesetzt sein.In an embodiment of the invention which is expedient in particular for deep-drawn carrier strips, it is provided that the carrier strip is composed of a strip lower part and a strip upper part. The recordings for the pivot bearing to be formed as projections on the last lower part be, while the last upper part of the support of the pivot bearing is used. In view of a particularly stiff and possibly hydraulically easily sealed composite of the carrier strip parts also the last part and the last part upper part are designed to be trough-shaped and interleaved. In addition to this geometric design, the designer of course, a variety of other options are open. To name only a few, the stiffening border of a tub can also be replaced by integrally formed stiffening ribs or ribs. In addition, in the case of forming by means of the mentioned hydroforming, the carrier strip can be composed both in one piece and in several parts.
Der aus dem Leistenoberteil und dem Leistenunterteil gebildete Verbund kann kraftschlüssig, beispielsweise mittels einer Presspassung, oder stoffschlüssig, beispielsweise durch Verschweißen, oder auch formschlüssig, beispielsweise mittels des o.g. Durchsetzfügens oder durch randseitiges Umbördeln der Leistenteile erzeugt werden. Zudem besteht auch die Möglichkeit, die Leistenteile lediglich mittels der Verschraubung des Kipphebelträgers im Zylinderkopf aneinander zu fixieren. Im Falle der vorher genannten Ausgestaltung des Kipphebelträgers mit den zwei voneinander beabstandet verlaufenden und mittels Querstreben verbundenen Trägerleisten kann es ferner vorgesehen sein, die Leistenunterteile zusammen mit den Querstreben als einstückiges Bauteil, beispielsweise aus einer einzigen Stanzplatine mittels Tiefziehen, herzustellen. Je nach Bauraumangebot innerhalb des Zylinderkopfs besteht diese Möglichkeit alternativ oder optional auch für die Leistenoberteile.The composite formed from the last upper part and the lower part of the strip can be non-positively, for example by means of a press fit, or cohesively, for example by welding, or even form-fitting, for example by means of the o.g. Durchsetzfügens or by edge-side beading of the strip parts are generated. In addition, it is also possible to fix the strip parts only by means of the screw connection of the rocker arm carrier in the cylinder head to each other. In the case of the aforementioned embodiment of the Kipphebelträgers with the two spaced apart extending and connected by crossbars carrier strips, it may also be provided, the strip lower parts together with the crossbars as a one-piece component, for example, from a single punched plate by deep drawing produce. Depending on the available space within the cylinder head, this option is available alternatively or optionally also for the top parts.
Schließlich sollen der Kipphebelträger, die Schwenklager und die Kipphebel mittels Verbindungselementen, die zum einen zwischen dem Kipphebelträger und den Schwenklagern und zum anderen zwischen den Schwenklagern und den Kipphebeln verlaufen, verliersicher aneinander gehaltert sein und eine in die Brennkraftmaschine montierbare Baueinheit bilden. Im Hinblick auf eine weiterhin vereinfachte Montage kann die Baueinheit darüber hinaus auch bereits mit den erforderlichen Verschraubungselementen und/oder Dichtungselementen versehen sein.Finally, the Kipphebelträger, the pivot bearing and the rocker arm by means of connecting elements, which extend firstly between the Kipphebelträger and the pivot bearings and the other between the pivot bearings and the rocker arms, be held captive together and form a mountable in the engine assembly. With regard to a further simplified assembly, the assembly may also be already provided with the necessary screwing and / or sealing elements.
Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und den Zeichnungen, in denen ein Ausführungsbeispiel der Erfindung dargestellt ist. Dabei handelt es sich bezüglich erforderlicher Umformgeometrien wie beispielsweise Übergangsradien um eine teilweise vereinfachte Darstellung. Es zeigen:
- Figur 1
- eine aus Kipphebelträger, Schwenklagern und Kipphebeln bestehende Baueinheit in perspektivischer Draufsicht;
Figur 2- die Baueinheit gemäß
Figur 1 in perspektivischer Untersicht; Figur 3- den Kipphebelträger gemäß
Figur 1 mit Leistenoberteilen, Leistenunterteilen und daran befestigten Querstreben in explodierter perspektivischer Darstellung; Figur 4- eine der Querstreben gemäß
;Figur 3 Figur 5- die Baueinheit gemäß
Figur 1 in perspektivischer Längsschnittdarstellung; - Figur 6
- einen vergrößerten Ausschnitt der Baueinheit gemäß
Figur 1 in perspektivischer Darstellung und - Figur 7
- eines der Leistenunterteile gemäß
in perspektivischer Untersicht.Figur 3
- FIG. 1
- a consisting of Kipphebelträger, pivot bearings and rocker arms assembly in a perspective plan view;
- FIG. 2
- the unit according to
FIG. 1 in perspective bottom view; - FIG. 3
- the rocker arm according to
FIG. 1 with groin tops, groin bottoms and attached cross struts in exploded perspective view; - FIG. 4
- one of the cross struts according to
FIG. 3 ; - FIG. 5
- the unit according to
FIG. 1 in a perspective longitudinal section view; - FIG. 6
- an enlarged section of the unit according to
FIG. 1 in perspective and - FIG. 7
- one of the last parts according to
FIG. 3 in perspective bottom view.
In den
Wie es aus der explodierten Darstellung des Kipphebelträgers 1 in
Erfindungsgemäß sind alle Komponenten des dünnwandigen Kipphebelträgers 1 in einem Tiefziehumformverfahren aus Stahlblechplatinen hergestellt, wobei die Leistenunterteile 7, 8 und die Leistenoberteile 9, 10 im wesentlichen wannenförmig und ineinander verschachtelt, d.h. mit gleicher Orientierung der offenen Wannenseiten, zusammengesetzt sind. Unter dem Begriff "dünnwandig" ist im anmeldungsgemäßen Zusammenhang zu verstehen, dass die Außenabmessungen des Kipphebelträgers 1 ein Vielfaches von dessen Wandstärke betragen. Vorliegend weist jede Trägerleiste 4, 5 eine Breite von etwa 45mm bei einer im wesentlichen gleichmäßigen Wandstärke von wenigen Millimetern, hier etwa 2,5 mm auf. Die jeweils einem Zylinder der Brennkraftmaschine zugeordneten Kipphebelpaare sind von Ausformungen 13 in den Leistenunterteilen 7, 8 eingefasst, welche im vorliegenden Ausführungsbeispiel im wesentlichen quaderförmig gestaltet sind.According to the invention all components of the thin-walled Kipphebelträgers 1 are produced in a thermoforming of sheet steel blanks, the strip
Wie es in den Schnittdarstellungen der Baueinheit in den
Die an sich bekannten Ausgleichselemente 15 umfassen ein topfförmiges Gehäuse 16, das am Außenumfang in hohlzylindrischen Aufnahmen 17 in der Trägerleiste 5 geführt ist, und einen hohlzylindrischen Ausgleichskolben 18, der am Innenumfang des Gehäuses 16 unter Bildung eines Hochdruckraums 19 längsbeweglich gelagert ist. Bei geöffnetem Rückschlagventil 20 kommuniziert der Hochdruckraum 19 unmittelbar mit einem im Inneren des Ausgleichskolbens 18 verlaufenden Hydraulikmittelreservoir 21, das seinerseits über einen Hydraulikmittelübertritt in Form einer muldenförmig angeprägten Ausnehmung 22 an der den Hohlraum 14 begrenzenden Innenfläche des Leistenoberteils 10 an den Hohlraum 14 angeschlossen ist.The known
Wie es aus den
Der Kipphebelträger 1, die Ausgleichselemente 15 und die die aus Blechwerkstoff umgeformten Kipphebel 2 sind zur Bildung der in den Zylinderkopf montierbaren Baueinheit mittels Verbindungselementen verliersicher aneinander gehaltert. Bei den Verbindungselementen handelt es sich zum einen um einen am Außenumfang des Gehäuses 16 verlaufenden Sprengring 25, der bei expandiertem Ausgleichselement 15 an einer die Aufnahme 17 begrenzenden Fase 26 anschlägt und so das Ausgleichselement 15 in der Aufnahme 17 hält, und zum anderen um eine am Kipphebel 2 befestigte Halteklammer 27, die sich über die Gelenkpfanne 24 erstreckt und in einen Hinterstich 28 oberhalb des Gelenkkopfs 23 frei schwenkbeweglich eingreift, um den Kipphebel 2 am Ausgleichselement zu halten.The Kipphebelträger 1, the compensating
Der Hohlraum 14 ist im Bereich der gestuft ausgebildeten Fügepassung von Leistenoberteil 10 und Leistenunterteil 8 gegenüber der Umgebung der Trägerleiste 5 hydraulisch weitgehend abgedichtet. Je nach erforderlicher Dichtheit kann hierzu auch ein in die Fügepassung eingesetztes Dichtmittel vorgesehen sein. Der Anschluss des Hohlraums 14 an die Druckmittelversorgung der Brennkraftmaschine erfolgt jeweils über einen Einlass 29 in Form einer gestanzten Öffnung an einem Ende der Leistenunterteile 7, 8 (siehe auch
Auf die Ausformungen 13 gemäß den
Wie in den
Schließlich kann für die präzise Positionierung des Kipphebelträgers 1 im Zylinderkopf eine nicht dargestellte Zentrierung nach Art einer Passstiftverbindung vorgesehen sein. Diese kann zweckmäßigerweise so ausgebildet sein, dass die beiden endseitigen, diagonal gegenüberliegenden Ausformungen 13 der Leistenunterteile 7, 8 mit angeformten zylindrischen Vorsprüngen als Passstiftersatz versehen sind, die in korrespondierende Passbohrungen im Zylinderkopf eingreifen.Finally, a centering, not shown, can be provided in the manner of a dowel pin connection for the precise positioning of the rocker arm carrier 1 in the cylinder head. This can be suitably designed so that the two end, diagonally opposite
- 11
- KipphebelträgerKipphebelträger
- 22
- Kipphebelrocker arm
- 33
- Nockenrollecam roller
- 44
- Trägerleiste, einlassseitigCarrier rail, inlet side
- 55
- Trägerleiste, auslassseitigCarrier rail, exhaust side
- 66
- VentilbetätigungsflächeValve actuating surface
- 77
- Leistenunterteil, einlassseitigMolded base, inlet side
- 88th
- Leistenunterteil, auslassseitigMolded base, outlet side
- 99
- Leistenoberteil, einlassseitigGroin top, inlet side
- 1010
- Leistenoberteil, auslassseitigLast upper part, outlet side
- 1111
- Querstrebecrossmember
- 1212
- Mittelabschnitt der QuerstrebeMiddle section of the cross brace
- 1313
- Ausformung im LeistenunterteilForming in the last part of the bar
- 1414
- Hohlraumcavity
- 1515
- Schwenklager / VentilspielausgleichselementSwivel bearing / valve clearance compensation element
- 1616
- Gehäusecasing
- 1717
- Aufnahmeadmission
- 1818
- Ausgleichskolbenbalance piston
- 1919
- HochdruckraumHigh-pressure chamber
- 2020
- Rückschlagventilcheck valve
- 2121
- HydraulikmittelreservoirHydraulic fluid reservoir
- 2222
- Ausnehmungrecess
- 2323
- Gelenkkopfjoint head
- 2424
- Gelenkpfannesocket
- 2525
- Sprengringsnap ring
- 2626
- Fasechamfer
- 2727
- Halteklammerretaining clip
- 2828
- Hinterstichundercut
- 2929
- Einlass für HydraulikmittelInlet for hydraulic fluid
- 3030
- Kontaktflächecontact area
- 3131
- Auslass für HydraulikmittelOutlet for hydraulic fluid
- 3232
- Anschraubpunktfixation point
- 3333
- Anformungconformation
- 3434
- Öffnungopening
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15883409P | 2009-03-10 | 2009-03-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2233704A1 true EP2233704A1 (en) | 2010-09-29 |
EP2233704B1 EP2233704B1 (en) | 2011-10-26 |
Family
ID=42312853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10154529A Not-in-force EP2233704B1 (en) | 2009-03-10 | 2010-02-24 | Rocker arm holder for a valve drive of a combustion engine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2233704B1 (en) |
AT (1) | ATE530738T1 (en) |
ES (1) | ES2373367T3 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2500898C1 (en) * | 2012-04-11 | 2013-12-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Елецкий государственный университет им. И.А. Бунина" | Gas distributing mechanism of four-stroke ice |
EP2792859A1 (en) * | 2013-03-25 | 2014-10-22 | GT Technologies | Retention device for valve actuating mechanism |
US9863291B2 (en) | 2015-05-14 | 2018-01-09 | GT Technologies | Locator for use in a valvetrain of a cylinder head of an internal combustion engine |
DE102018000918A1 (en) | 2018-02-05 | 2019-08-08 | Daimler Ag | Module for a cylinder head of an internal combustion engine |
DE102018000924A1 (en) | 2018-02-05 | 2019-08-08 | Daimler Ag | Cylinder head for an internal combustion engine |
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US1699658A (en) * | 1926-11-15 | 1929-01-22 | John T Fagan | Combination oil reservoir, rocker arm, and main-support overhead-stamped bearing shaft |
US1699659A (en) * | 1927-09-30 | 1929-01-22 | John T Fagan | Rocker arm and rocker-arm shaft |
FR1420573A (en) * | 1964-10-30 | 1965-12-10 | Simca Automobiles Sa | Holding device for rocker arms mounted on ball joints |
US3841280A (en) * | 1973-08-16 | 1974-10-15 | Gen Motors Corp | Valve rocker arm and pivot assembly |
US4724804A (en) * | 1987-02-24 | 1988-02-16 | General Motors Corporation | Engine valve train module |
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DE19842862A1 (en) * | 1998-09-18 | 2000-03-23 | Schaeffler Waelzlager Ohg | Valve gear in cylinder head of internal combustion engine having row of rocker levers located on common pivot center extending in longitudinal direction of cylinder head |
EP1119689A1 (en) * | 1998-10-05 | 2001-08-01 | EATON AUTOMOTIVE S.p.A. | Valve train assembly |
-
2010
- 2010-02-24 ES ES10154529T patent/ES2373367T3/en active Active
- 2010-02-24 EP EP10154529A patent/EP2233704B1/en not_active Not-in-force
- 2010-02-24 AT AT10154529T patent/ATE530738T1/en active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US1699658A (en) * | 1926-11-15 | 1929-01-22 | John T Fagan | Combination oil reservoir, rocker arm, and main-support overhead-stamped bearing shaft |
US1699659A (en) * | 1927-09-30 | 1929-01-22 | John T Fagan | Rocker arm and rocker-arm shaft |
FR1420573A (en) * | 1964-10-30 | 1965-12-10 | Simca Automobiles Sa | Holding device for rocker arms mounted on ball joints |
US3841280A (en) * | 1973-08-16 | 1974-10-15 | Gen Motors Corp | Valve rocker arm and pivot assembly |
US4840151A (en) * | 1986-06-14 | 1989-06-20 | Honda Giken Kogyo Kabushiki Kaisha | Sealed-type lash adjuster |
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JPH09250315A (en) * | 1996-03-18 | 1997-09-22 | Nippon Piston Ring Co Ltd | Rocker arm assembly holding device |
DE19842862A1 (en) * | 1998-09-18 | 2000-03-23 | Schaeffler Waelzlager Ohg | Valve gear in cylinder head of internal combustion engine having row of rocker levers located on common pivot center extending in longitudinal direction of cylinder head |
EP1119689A1 (en) * | 1998-10-05 | 2001-08-01 | EATON AUTOMOTIVE S.p.A. | Valve train assembly |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2500898C1 (en) * | 2012-04-11 | 2013-12-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Елецкий государственный университет им. И.А. Бунина" | Gas distributing mechanism of four-stroke ice |
EP2792859A1 (en) * | 2013-03-25 | 2014-10-22 | GT Technologies | Retention device for valve actuating mechanism |
US9482120B2 (en) | 2013-03-25 | 2016-11-01 | GT Technologies | Retention device for valve actuating mechanism |
US9863291B2 (en) | 2015-05-14 | 2018-01-09 | GT Technologies | Locator for use in a valvetrain of a cylinder head of an internal combustion engine |
DE102018000918A1 (en) | 2018-02-05 | 2019-08-08 | Daimler Ag | Module for a cylinder head of an internal combustion engine |
DE102018000924A1 (en) | 2018-02-05 | 2019-08-08 | Daimler Ag | Cylinder head for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP2233704B1 (en) | 2011-10-26 |
ES2373367T3 (en) | 2012-02-02 |
ATE530738T1 (en) | 2011-11-15 |
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