EP1563961B1 - Device and method for assembling a valve mechanism - Google Patents

Device and method for assembling a valve mechanism Download PDF

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Publication number
EP1563961B1
EP1563961B1 EP04100536A EP04100536A EP1563961B1 EP 1563961 B1 EP1563961 B1 EP 1563961B1 EP 04100536 A EP04100536 A EP 04100536A EP 04100536 A EP04100536 A EP 04100536A EP 1563961 B1 EP1563961 B1 EP 1563961B1
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EP
European Patent Office
Prior art keywords
valve
valve stem
tappet
camshaft
stem
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.)
Expired - Lifetime
Application number
EP04100536A
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German (de)
French (fr)
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EP1563961A1 (en
Inventor
Torsten Kluge
Frank Aust
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
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Ford Global Technologies LLC
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Publication date
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to EP04100536A priority Critical patent/EP1563961B1/en
Priority to DE502004002084T priority patent/DE502004002084D1/en
Publication of EP1563961A1 publication Critical patent/EP1563961A1/en
Application granted granted Critical
Publication of EP1563961B1 publication Critical patent/EP1563961B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/24—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same mounting or demounting valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L1/205—Adjusting or compensating clearance by means of shims or the like
    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/02—Formulas

Definitions

  • the invention relates to a device and a method for assembling at least one valve arrangement in which a valve stem is firmly connected to a valve stem.
  • a device for pressing a valve spring which has a provided with a groove for receiving a jaw of a screw clamp adapter, which exerts the compressive force on the valve spring with its flat lower end face.
  • a preassembled unit for mounting a valve assembly is known in which a holding device is used for temporarily holding together the spring, the spring seat and the spring lock prior to assembly in the valve assembly.
  • a valve arrangement for an internal combustion engine which contains a valve element with a valve stem, which is surrounded on its upper side by a cup-shaped valve stem, wherein the valve stem is firmly connected to the valve stem, for example by welding.
  • a valve stem which is surrounded on its upper side by a cup-shaped valve stem, wherein the valve stem is firmly connected to the valve stem, for example by welding.
  • exchangeable shims of different thickness are used.
  • Other arrangements using a shim are known from JP-A-06081615 or JP-A-61072810.
  • valve stem is composed of three sections, one of which is formed as a disc third section slidably but rotationally fixed on the first section is arranged and is in meshing engagement with the likewise formed as a disc second section by the action of a spring.
  • the device according to the invention is used for mounting at least one valve arrangement of the type described above, in which a valve stem is firmly connected to a valve stem.
  • the device is set up to set a defined positioning of the valve tappet on the valve stem preassembled in the cylinder head of an internal combustion engine before the valve tappet and the valve stem are finally connected to one another.
  • a “defined positioning” is to be understood in particular as meaning a positioning in which the valve tappet in its final position of use has a predetermined desired distance from the cams of a camshaft arrangement. In particular, this distance (“lash”) can be chosen so that it corresponds to the game to be complied between valve stem and cam, so that no further shims are required. The material savings of the shims and the correspondingly faster assembly of the valve assembly can be saved considerable costs.
  • the device has at least one storage area with at least one (preferably adjacent thereto) stamp area.
  • the storage area is designed so that it can be inserted into a camshaft bearing, wherein during this introduction of the associated punch area simultaneously a valve stem, which is pre-mounted on a valve stem, in its defined position suppressed.
  • Storage area and punch area of the device thus act together as a mold or a die, which ensures by moving the bearing area in a reference position (camshaft bearing) that the valve stem is pressed on the valve stem in the desired desired position.
  • a device of this type may in particular be rotationally symmetrical, so that the bearing area and / or the stamp area are cylindrical. This has the advantage that it is not necessary to pay attention to the exact angular orientation of the device, which simplifies their application accordingly.
  • this is designed to effect parallel or simultaneous positioning in a plurality of valve arrangements belonging to a camshaft of the internal combustion engine.
  • a device of the type described above similar to a camshaft may be rod-shaped, wherein the bearing areas are located exactly at the locations of the pivot bearing of a camshaft and wherein the associated punch areas are located at the positions of the cams.
  • this has at least one sensor with which the current position of the valve stem and / or the valve stem can be detected. With the help of the sensor can therefore be monitored when the valve stem or the valve stem reaches a desired position in which the firm connection between the valve stem and valve tappet can be made.
  • the sensor may be configured to measure the position of the valve lifter relative to the support of the valve assembly, for example relative to (at least) one camshaft bearing.
  • the device further optionally includes means for fixing the position of the valve stem so that it can not move when the relative position of the valve stem on the valve stem is adjusted.
  • these means can be designed so that this valve stem in the closed position of Fix the valve.
  • the means may be designed as a stamp which presses against the valve from the cylinder inside of an internal combustion engine and holds it in the closed position.
  • the means may also be designed to produce or maintain a certain overpressure in the cylinder of an internal combustion engine which holds the valve in the closed position.
  • the device may according to another embodiment holding means such as grippers, with which parts of the valve assembly can be held and transported to its mounting location. These parts may in particular be the valve tappet, sealing components and / or the valve spring.
  • holding means such as grippers, with which parts of the valve assembly can be held and transported to its mounting location. These parts may in particular be the valve tappet, sealing components and / or the valve spring.
  • valve stem and valve tappet can be made, or represent the actuators or components for other assembly operations.
  • the method is carried out with a device of the type described above. Therefore, with regard to further details, advantages and developments of the method, reference may additionally be made to the above description.
  • the method has the advantage that in a single operation a usable positioning and fixation of the valve lifters on the valve stems takes place without, for example, a readjustment with an insert disk would be necessary later.
  • the achievement of the defined positioning is monitored by sensors.
  • the sliding of the valve stem can be terminated in a fed-back method, if this has reached exactly its desired position.
  • the defined positioning can be determined in particular relative to the position of one or more reference points on the carrier of the valve arrangement (for example, the cylinder head of an internal combustion engine).
  • Preferred reference points are the bearings of the camshaft or the valve seat.
  • the positioning of each valve lifter may be determined relative to (at least) one associated camshaft bearing.
  • the defined positioning is determined relative to the averaged position of at least two reference points on the support of the valve assembly. For example, the average of the position of two adjacent camshaft bearings can be determined, and the position of the valve lifters associated with these camshaft bearings can be determined relative to this average value.
  • FIG. 1 shows an exemplary embodiment of a valve arrangement whose assembly is to be improved in the context of the present invention.
  • This valve arrangement is characterized in that a cup-shaped valve stem 21 is fixed with a receiving sleeve in the interior on the upper end of a valve stem 25.
  • the firm connection between valve stem 25 and valve stem 21 can then be produced, for example, by bonding, press fit, clamping, gluing or welding.
  • Such a valve arrangement is known from EP 1 375 842 A1, which is incorporated by reference in its entirety into the present application.
  • FIG. 2 shows a first variant of the solution in this regard.
  • four cylinders 24 of the cylinder bank of an internal combustion engine are shown schematically in the lower part of the figure, which each have valve assemblies 20 with four inlet and outlet valves. Of these, the circular valve seats 23 can be seen in the figure.
  • camshaft bearings 22 are indicated in the figure for one of the camshafts, which are each located between two valves of a cylinder.
  • a camshaft (not shown) is rotatably mounted in the camshaft bearings 22, wherein a two-part construction of the camshaft bearing is generally made of a base and a cap (omitted in FIG. 2) (see EP 1 350 931 A1).
  • two valve tappets 21 associated with said camshaft row are indicated for the first cylinder 24. To simplify the illustration, these are omitted in the other cylinders.
  • a mounting device 10 for the assembly of valve tappets 21 is shown on Ventiltechften.
  • the rotationally symmetrical device 10 has great similarity with a camshaft and comprises in the core a shaft 13 made of rolled steel.
  • this shaft 13 has a bearing portion 11 and adjacent thereto to the left and right each a punch area 12.
  • the bearing portions 11 are located exactly at the positions of the pivot bearing of an associated camshaft or at the positions of the camshaft bearing 22 on the cylinder head.
  • the diameter of the bearing portions 11 typically corresponds to the diameter of the corresponding camshaft at that location plus twice the width of the camshaft nip (i.e., the gap between a camshaft bearing 22 and a camshaft therein).
  • the punch areas 12 are located at the locations where the cams are seated in the associated camshaft, and they are cylindrical in the example shown.
  • valve assemblies 20 in a cylinder bank of Figure 2 begins with the valve members with the valve stems and the valve lifters 21 and other individual components of the valve assemblies (eg, valve stem seals or the valve spring) in all of a camshaft Valves are pre-assembled in the holes of the cylinder head.
  • the valve lifters 21 are only a small piece attached to the associated valve stems 25, so that while they hold there, but still need to be postponed for reaching their final position.
  • This further pushing is then carried out with the mounting device 10, wherein the valve stems are held firmly in place by a fixation of the associated valve.
  • This fixation can be done for example by appropriate (one or more parts) punch or punching tools from the combustion chamber forth (not shown).
  • a high gas or liquid pressure can be generated in the interior of the combustion chamber of the engine, which prevents an opening movement of the valves.
  • the mounting device 10 is then inserted with the bearing areas 11 in the associated camshaft bearing 22.
  • the punch areas 12 press simultaneously on the valve tappets 21, so that they are further pushed onto the valve stems.
  • the bearing areas 11 reach their form-fittingly defined position in the camshaft bearings 22, the valve tappets 21 have also reached their correct, defined positioning on the valve stems. Since any movement exerted by a fitter or an assembly robot is transmitted to the valve lifters via the fixture 10, this positioning method is extremely robust to variations in the assembly process.
  • valve tappets 21 and the valve stems are made, for which in particular the bonding, the press connection, the clamping and the gluing are suitable.
  • An advantage of these types of connection is that they unfold their effect directly when attaching the valve stem to the valve stem, as a rule after positioning no special activity is required.
  • Figure 2 shows only the simplest possible embodiment of a mounting device 10.
  • Other embodiments could, for example, be non-rotationally symmetric or be equipped with joints or connections to actuators and / or other components.
  • the tool 10 could also have holding devices with which preassembled valve tappets or other components such as a valve stem seal or the valve spring could be transported by a supply to the cylinder head and placed there on the valve stems.
  • FIG. 3 shows a variant in which a sensor 111 monitors the positioning of a valve tappet 21 on a valve stem 25.
  • the valve stem is pressed by a one-piece or multi-part punching device 110 until reaching the desired position on the valve stem 25, while the valve stem 25 is held simultaneously.
  • the sensor 111 indicates in this case, when the postponement is to be stopped.
  • Sensors 111 suitable for the measurements are, for example, a contact sensor, a proximity sensor, an ultrasonic sensor, a light barrier or the like.
  • the friction welding is selected as the connection method between valve stem 25 and valve stem 21, in which the valve stem 25 is rotated to generate heat, in addition to the height of the valve stem 21, the height of the valve stem 25 must be measured relative to the camshaft bearing 22.
  • the position of the valve lifter 21 and / or valve stem 25 may be measured individually with respect to each reference point, for example, with respect to the associated camshaft bearing 22 or valve seat (not shown).
  • the reference point for the height to be set of the valve tappet 21 can also be determined as the mean value of two reference points on the cylinder head, for example as the center of the positions of two (adjacent) camshaft bearings 22.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur Montage mindestens einer Ventilanordnung, bei der ein Ventilstößel fest mit einem Ventilschaft verbunden wird.The invention relates to a device and a method for assembling at least one valve arrangement in which a valve stem is firmly connected to a valve stem.

Aus US 4,654,944 ist eine Vorrichtung zum Pressen einer Ventilfeder bekannt, welche einen mit einer Nut zur Aufnahme von einer Klemmbacke einer Schraubzwinge versehenen Adapter aufweist, welcher mit seiner flachen unteren Stirnfläche die Kompressionskraft auf die Ventilfeder ausübt. Aus US 5,207,196 ist eine vormontierte Einheit für die Montage einer Ventilanordnung bekannt, bei welcher eine Haltevorrichtung für ein vorübergehendes Zusammenhalten der Feder, des Federsitzes und der Federsicherung vor der Montage in der Ventilanordnung verwendet wird.From US 4,654,944 a device for pressing a valve spring is known, which has a provided with a groove for receiving a jaw of a screw clamp adapter, which exerts the compressive force on the valve spring with its flat lower end face. From US 5,207,196 a preassembled unit for mounting a valve assembly is known in which a holding device is used for temporarily holding together the spring, the spring seat and the spring lock prior to assembly in the valve assembly.

Aus EP 1 375 842 A1 ist eine Ventilanordnung für eine Brennkraftmaschine bekannt, welche ein Ventilelement mit einem Ventilschaft enthält, der an seiner Oberseite von einem tassenförmigen Ventilstößel umgeben ist, wobei der Ventilstößel zum Beispiel durch Schweißen fest mit dem Ventilschaft verbunden ist. Um definierte Abstände zwischen der Oberseite des Ventilstößels und den Nocken einer Nockenwelle einstellen zu können, werden dabei austauschbare Einstellscheiben unterschiedlicher Dicke verwendet. Weitere Anordnungen mit Verwendung einer Einstell- bzw. Ausgleichsscheibe sind aus JP-A-06081615 oder JP-A-61072810 bekannt.From EP 1 375 842 A1 a valve arrangement for an internal combustion engine is known, which contains a valve element with a valve stem, which is surrounded on its upper side by a cup-shaped valve stem, wherein the valve stem is firmly connected to the valve stem, for example by welding. In order to set defined distances between the top of the valve stem and the cam of a camshaft, while exchangeable shims of different thickness are used. Other arrangements using a shim are known from JP-A-06081615 or JP-A-61072810.

Aus GB-A-3947 ist eine Ventilanordnung bekannt, bei welcher zur Ermöglichung der Einstellung des Abstandes zwischen Nocken und Ventilschaft der Ventilschaft aus drei Abschnitten zusammengesetzt ist, von denen der als Scheibe ausgebildete dritte Abschnitt gleitend aber rotationsfest auf dem ersten Abschnitt angeordnet ist und durch Einwirkung einer Feder in Zahneingriff mit dem ebenfalls als Scheibe ausgebildeten zweiten Abschnitt steht.From GB-A-3947 a valve arrangement is known in which, to allow the adjustment of the distance between cam and valve stem, the valve stem is composed of three sections, one of which is formed as a disc third section slidably but rotationally fixed on the first section is arranged and is in meshing engagement with the likewise formed as a disc second section by the action of a spring.

Vor diesem Hintergrund war es Aufgabe der vorliegenden Erfindung, Mittel zur weiteren Vereinfachung der beschriebenen Ventilanordnung bereitzustellen.Against this background, it was an object of the present invention to provide means for further simplifying the described valve arrangement.

Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Anspruchs 1 sowie durch ein Verfahren mit den Merkmalen des Anspruchs 6 gelöst.This object is achieved by a device having the features of claim 1 and by a method having the features of claim 6.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous embodiments of the invention are described in the subclaims.

Die erfindungsgemäße Vorrichtung dient der Montage mindestens einer Ventilanordnung der vorstehend erläuterten Art, bei welcher ein Ventilstößel fest mit einem Ventilschaft verbunden wird. Die Vorrichtung ist zur Einstellung einer definierten Positionierung des Ventilstößels auf dem im Zylinderkopf einer Brennkraftmaschine vormontierten Ventilschaft eingerichtet, bevor der Ventilstößel und der Ventilschaft endgültig miteinander verbunden werden. Unter einer "definierten Positionierung" ist dabei insbesondere eine solche Positionierung zu verstehen, bei welcher der Ventilstößel in seiner endgültigen Gebrauchsposition einen vorgegebenen gewünschten Abstand zu den Nocken einer Nockenwellenanordnung aufweist. Insbesondere kann dieser Abstand ("lash") dabei so gewählt werden, daß er dem einzuhaltenden Spiel zwischen Ventilstößel und Nocken entspricht, so daß keine weiteren Einstellscheiben erforderlich sind. Durch die Materialeinsparung der Einstellscheiben sowie die entsprechend schnellere Montage der Ventilanordnung können erhebliche Kosten eingespart werden.The device according to the invention is used for mounting at least one valve arrangement of the type described above, in which a valve stem is firmly connected to a valve stem. The device is set up to set a defined positioning of the valve tappet on the valve stem preassembled in the cylinder head of an internal combustion engine before the valve tappet and the valve stem are finally connected to one another. A "defined positioning" is to be understood in particular as meaning a positioning in which the valve tappet in its final position of use has a predetermined desired distance from the cams of a camshaft arrangement. In particular, this distance ("lash") can be chosen so that it corresponds to the game to be complied between valve stem and cam, so that no further shims are required. The material savings of the shims and the correspondingly faster assembly of the valve assembly can be saved considerable costs.

Die Vorrichtung weist mindestens einen Lagerbereich mit mindestens einem (vorzugsweise daran angrenzenden) Stempelbereich auf. Der Lagerbereich ist dabei so ausgestaltet, daß dieser in ein Nockenwellenlager eingeführt werden kann, wobei während dieser Einführung der zugehörige Stempelbereich gleichzeitig einen Ventilstößel, der auf einem Ventilschaft vormontiert ist, in seine definierte Position drückt. Lagerbereich und Stempelbereich der Vorrichtung wirken somit gemeinsam wie ein Formstück bzw. eine Matrize, welche durch Bewegen des Lagerbereiches in eine Referenzposition (Nockenwellenlager) dafür sorgt, daß der Ventilstößel auf dem Ventilschaft in die gewünschte Sollposition gedrückt wird. Eine Vorrichtung dieser Art kann insbesondere rotationssymmetrisch ausgebildet sein, so daß Lagerbereich und/oder Stempelbereich zylindrisch sind. Dies hat den Vorteil, daß auf die exakte Winkelausrichtung der Vorrichtung nicht geachtet werden muß, was deren Anwendung entsprechend vereinfacht.The device has at least one storage area with at least one (preferably adjacent thereto) stamp area. The storage area is designed so that it can be inserted into a camshaft bearing, wherein during this introduction of the associated punch area simultaneously a valve stem, which is pre-mounted on a valve stem, in its defined position suppressed. Storage area and punch area of the device thus act together as a mold or a die, which ensures by moving the bearing area in a reference position (camshaft bearing) that the valve stem is pressed on the valve stem in the desired desired position. A device of this type may in particular be rotationally symmetrical, so that the bearing area and / or the stamp area are cylindrical. This has the advantage that it is not necessary to pay attention to the exact angular orientation of the device, which simplifies their application accordingly.

Gemäß einer bevorzugten Ausgestaltung der Vorrichtung ist diese dahingehend ausgebildet, in mehreren zu einer Nockenwelle der Brennkraftmaschine gehörigen Ventilanordnungen parallel bzw. gleichzeitig eine Positionierung zu bewirken. So kann beispielsweise eine Vorrichtung der vorstehend beschriebenen Art ähnlich einer Nockenwelle stangenförmig ausgebildet sein, wobei sich die Lagerbereiche genau an den Stellen der Drehlager einer Nockenwelle befinden und wobei die zugehörigen Stempelbereiche an den Positionen der Nocken liegen. Durch Einsetzen einer derartigen Vorrichtung in die Lager der später zu montierenden Nokkenwelle kann dann gleichzeitig an allen Zylindern die definierte Positionierung der dortigen Ventilstößel vorgenommen werden.According to a preferred embodiment of the device, this is designed to effect parallel or simultaneous positioning in a plurality of valve arrangements belonging to a camshaft of the internal combustion engine. For example, a device of the type described above similar to a camshaft may be rod-shaped, wherein the bearing areas are located exactly at the locations of the pivot bearing of a camshaft and wherein the associated punch areas are located at the positions of the cams. By inserting such a device into the bearings of the later to be mounted camshaft can then be made at the same time on all cylinders, the defined positioning of the local valve tappet.

Gemäß einer Weiterbildung der Vorrichtung weist diese mindestens einen Sensor auf, mit welchem die aktuelle Position des Ventilstößels und/oder des Ventilschaftes erfaßt werden kann. Mit Hilfe des Sensors kann daher überwacht werden, wann der Ventilstößel bzw. der Ventilschaft eine Sollposition erreicht, in welcher die feste Verbindung zwischen Ventilschaft und Ventilstößel hergestellt werden kann. Der Sensor kann insbesondere dahingehend ausgebildet sein, die Position des Ventilstößels relativ zu dem Träger der Ventilanordnung zu messen, beispielsweise relativ zu (mindestens) einem Nockenwellenlager.According to one embodiment of the device, this has at least one sensor with which the current position of the valve stem and / or the valve stem can be detected. With the help of the sensor can therefore be monitored when the valve stem or the valve stem reaches a desired position in which the firm connection between the valve stem and valve tappet can be made. In particular, the sensor may be configured to measure the position of the valve lifter relative to the support of the valve assembly, for example relative to (at least) one camshaft bearing.

Die Vorrichtung enthält ferner optional Mittel zur Fixierung der Position des Ventilschaftes, so daß dieser sich nicht bewegen kann, wenn die Relativposition des Ventilstößels auf dem Ventilschaft eingestellt wird. Insbesondere können diese Mittel so ausgestaltet sein, daß diese den Ventilschaft in der Schließposition des Ventils fixieren. So können die Mittel beispielsweise als ein Stempel ausgebildet sein, welcher von der Zylinderinnenseite einer Brennkraftmaschine her gegen das Ventil drückt und dieses in der Schließposition hält. Ebenso können die Mittel auch dahingehend ausgebildet sein, einen bestimmten Überdruck im Zylinder einer Brennkraftmaschine zu erzeugen bzw. aufrecht zu erhalten, welcher das Ventil in der Schließposition hält.The device further optionally includes means for fixing the position of the valve stem so that it can not move when the relative position of the valve stem on the valve stem is adjusted. In particular, these means can be designed so that this valve stem in the closed position of Fix the valve. For example, the means may be designed as a stamp which presses against the valve from the cylinder inside of an internal combustion engine and holds it in the closed position. Likewise, the means may also be designed to produce or maintain a certain overpressure in the cylinder of an internal combustion engine which holds the valve in the closed position.

Die Vorrichtung kann gemäß einer anderen Weiterbildung Halteeinrichtungen wie beispielsweise Greifer aufweisen, mit denen Teile der Ventilanordnung gehalten und zu ihrem Montageort transportiert werden können. Bei diesen Teilen kann es sich insbesondere um den Ventilstößel, um Dichtungskomponenten und/oder um die Ventilfeder handeln. Vermöge der Halteeinrichtung erlaubt es die Vorrichtung, in einem Arbeitsgang die genannten Teile der Ventilanordnung zuzuführen und sie nach korrekter Positionierung des Ventilstößels dort dauerhaft zu montieren.The device may according to another embodiment holding means such as grippers, with which parts of the valve assembly can be held and transported to its mounting location. These parts may in particular be the valve tappet, sealing components and / or the valve spring. By virtue of the holding device, the device allows the said parts of the valve arrangement to be fed in a single operation and to be permanently mounted there after the valve tappet has been correctly positioned.

In ähnlicher Weise können weitere Einrichtungen in die Vorrichtung integriert werden, mit denen beispielsweise die Verbindung von Ventilschaft und Ventilstößel vorgenommen werden kann, oder die Aktuatoren oder Komponenten für andere Montagevorgänge darstellen.Similarly, other devices can be integrated into the device, with which, for example, the connection of valve stem and valve tappet can be made, or represent the actuators or components for other assembly operations.

Die Erfindung betrifft ferner ein Verfahren zur Montage einer Ventilanordnung, welches die folgenden Schritte umfaßt:

  • a) Vormontage eines Ventilschaftes im Zylinderkopf einer Brennkraftmaschine.
  • b) Vormontage eines Ventilstößels auf dem genannten Ventilschaft. Dabei wird beispielsweise ein mit einer Bohrung oder Hülse versehener Ventilstößel gerade so weit auf den Ventilschaft aufgesteckt, daß dieser dort vorübergehend hält, ohne abzufallen.
  • c) Weiteres Aufschieben des Ventilstößels auf den Ventilschaft, bis der Ventilstößel eine definierte Positionierung erreicht hat, wobei der Lagerbereich in das zugehörige Nockenwellenlager eingeführt wird, während der Stempelbereich gleichzeitig den auf dem Ventilschaft vormontierten Ventilstößel in dessen definierte Position drückt. Wie vorstehend erläutert liegt dabei in der "definierten Positionierung" genau der gewünschte Abstand zwischen dem Ventilstößel und den Nocken einer Nockenwelleneinrichtung im Gebrauchszustand der Ventilanordnung vor.
  • d) Herstellen einer festen Verbindung zwischen dem Ventilstößel und dem Ventilschaft. Dieser Schritt kann insbesondere simultan zum vorangehenden Schritt c) ablaufen, wenn die Verbindung zwischen den Komponenten beispielsweise über einen Preßsitz hergestellt wird. Andere mögliche Verbindungsarten sind das Bonding, das Klemmen, das Kleben und das Schweißen, insbesondere das Laserschweißen oder Reibschweißen.
The invention further relates to a method for assembling a valve arrangement, which comprises the following steps:
  • a) pre-assembly of a valve stem in the cylinder head of an internal combustion engine.
  • b) pre-assembly of a valve lifter on said valve stem. In this case, for example, provided with a bore or sleeve valve stem is just plugged so far on the valve stem that this holds there temporarily, without falling off.
  • c) Further sliding the valve lifter on the valve stem until the valve lifter has reached a defined positioning, wherein the bearing area is inserted into the associated camshaft bearing, while the stamp area at the same time presses the valve stem preassembled on the valve stem in its defined position. As explained above, exactly the desired distance between the valve tappet and the cams of a camshaft device is present in the "defined positioning" in the use state of the valve arrangement.
  • d) establishing a firm connection between the valve lifter and the valve stem. In particular, this step can take place simultaneously with the preceding step c) if the connection between the components is produced, for example, via a press fit. Other possible types of connection are bonding, clamping, gluing and welding, in particular laser welding or friction welding.

Das Verfahren wird mit einer Vorrichtung der vorstehend erläuterten Art ausgeführt. Daher kann hinsichtlich weiterer Einzelheiten, Vorteile und Weiterbildungen des Verfahrens zusätzlich auf die obige Beschreibung verwiesen werden. Das Verfahren hat den Vorteil, daß in einem einzigen Arbeitsgang eine gebrauchsfähige Positionierung und Fixierung der Ventilstößel auf den Ventilschäften erfolgt, ohne daß beispielsweise später eine Nachjustierung mit einer Einlegescheibe notwendig wäre.The method is carried out with a device of the type described above. Therefore, with regard to further details, advantages and developments of the method, reference may additionally be made to the above description. The method has the advantage that in a single operation a usable positioning and fixation of the valve lifters on the valve stems takes place without, for example, a readjustment with an insert disk would be necessary later.

Gemäß einer bevorzugten Ausführungsform des Verfahrens wird das Erreichen der definierten Positionierung sensorisch überwacht. Auf diese Weise kann in einem rückgekoppelten Verfahren das Aufschieben des Ventilstößels beendet werden, wenn dieser genau seine Sollposition erreicht hat.According to a preferred embodiment of the method, the achievement of the defined positioning is monitored by sensors. In this way, the sliding of the valve stem can be terminated in a fed-back method, if this has reached exactly its desired position.

Für die Festlegung und anschließende Überwachung der definierten Positionierung gibt es verschiedene Möglichkeiten. So kann die definierte Positionierung insbesondere relativ zur Position von einem oder mehreren Referenzpunkten am Träger der Ventilanordnung (beispielsweise dem Zylinderkopf einer Brennkraftmaschine) bestimmt werden. Bevorzugte Referenzpunkte sind dabei die Lager der Nockenwelle oder der Ventilsitz. Insbesondere kann die Positionierung eines jeden Ventilstößels relativ zu (mindestens) einem zugehörigen Nockenwellenlager bestimmt werden.There are various possibilities for defining and subsequently monitoring the defined positioning. Thus, the defined positioning can be determined in particular relative to the position of one or more reference points on the carrier of the valve arrangement (for example, the cylinder head of an internal combustion engine). Preferred reference points are the bearings of the camshaft or the valve seat. In particular, the positioning of each valve lifter may be determined relative to (at least) one associated camshaft bearing.

Bei einer anderen Ausführungsform wird die definierte Positionierung relativ zur gemittelten Position von mindestens zwei Referenzpunkten am Träger der Ventilanordnung bestimmt. Beispielsweise kann der Mittelwert der Position von zwei benachbarten Nockenwellenlagern festgestellt werden, und die Position der zu diesen Nockenwellenlagern gehörigen Ventilstößel kann relativ zu diesem Mittelwert bestimmt werden.In another embodiment, the defined positioning is determined relative to the averaged position of at least two reference points on the support of the valve assembly. For example, the average of the position of two adjacent camshaft bearings can be determined, and the position of the valve lifters associated with these camshaft bearings can be determined relative to this average value.

Im Folgenden wird die Erfindung anhand der Figuren beispielhaft näher erläutert. Es zeigen:

Fig. 1
einen vereinfachten Querschnitt durch einen Ventilschaft mit aufgesetztem Ventilstößel,
Fig. 2
schematisch eine Aufsicht auf eine Reihe von vier Zylindern mit zu montierenden Ventilstößeln sowie eine erste Ausführungsform einer erfindungsgemäßen Montagevorrichtung, und
Fig. 3
das Prinzip einer zweiten erfindungsgemäßen Vorrichtung zur Montage eines Ventilstößels auf einem Ventilschaft.
In the following the invention will be explained in more detail by way of example with reference to the figures. Show it:
Fig. 1
a simplified cross section through a valve stem with attached valve stem,
Fig. 2
schematically a plan view of a series of four cylinders with valve tappets to be mounted and a first embodiment of a mounting device according to the invention, and
Fig. 3
the principle of a second device according to the invention for mounting a valve stem on a valve stem.

In Figur 1 ist eine beispielhafte Ausführungsform für eine Ventilanordnung dargestellt, deren Montage im Rahmen der vorliegenden Erfindung verbessert werden soll. Diese Ventilanordnung ist dadurch gekennzeichnet, daß ein tassenförmiger Ventilstößel 21 mit einer Aufnahmehülse im Inneren auf dem oberen Ende eines Ventilschaftes 25 fixiert ist. Die feste Verbindung zwischen Ventilschaft 25 und Ventilstößel 21 kann dann dabei beispielsweise durch Bonding, Preßsitz, Klemmen, Kleben oder Schweißen hergestellt werden. Eine derartige Ventilanordnung ist aus der EP 1 375 842 A1 bekannt, welche durch Bezugnahme vollständig in die vorliegende Anmeldung aufgenommen wird.FIG. 1 shows an exemplary embodiment of a valve arrangement whose assembly is to be improved in the context of the present invention. This valve arrangement is characterized in that a cup-shaped valve stem 21 is fixed with a receiving sleeve in the interior on the upper end of a valve stem 25. The firm connection between valve stem 25 and valve stem 21 can then be produced, for example, by bonding, press fit, clamping, gluing or welding. Such a valve arrangement is known from EP 1 375 842 A1, which is incorporated by reference in its entirety into the present application.

Problematisch bei der Montage einer solchen Ventilanordnung ist, daß in engen Toleranzgrenzen ein definierter Abstand zwischen der Oberseite des Ventilstößels 21 und den Nocken einer Nockenwelle (nicht dargestellt) eingehalten werden muß. Variationen im Abstand bzw. Spiel (lash) zwischen Ventilstößel und Nocken treten üblicherweise vor allem durch produktions- und montagebedingte Schwankungen beim Ventil, Zylinderkopf, Ventilsitz und Ventilstößel auf. Toleranzen in den Abmessungen der Nockenwellen spielen dagegen eine geringere Rolle, da diese in sehr engen Bereichen von typischerweise 40 µm (für den Abstand zwischen Nockenwellenlager und Nockenfläche) liegen. Angesichts dieser Situation bestand Bedarf für ein möglichst einfaches und genaues Montageverfahren für Ventilanordnungen der in Figur 1 gezeigten Art.The problem with the assembly of such a valve arrangement is that in narrow tolerance limits, a defined distance between the top of the valve stem 21 and the cam of a camshaft (not shown) must be maintained. Variations in the distance or lash between the valve stem and cam usually occur mainly due to production-related and assembly-related fluctuations in the valve, cylinder head, valve seat and valve tappets. On the other hand, tolerances in the dimensions of the camshafts play a lesser role, since they are in very narrow ranges of typically 40 μm (for the distance between the camshaft bearing and the cam surface). In view of this situation, there was a need for a simple and accurate assembly method for valve arrangements of the type shown in FIG.

Figur 2 zeigt diesbezüglich eine erste Lösungsvariante. Dabei sind im unteren Teil der Figur schematisch vier Zylinder 24 der Zylinderreihe einer Brennkraftmaschine dargestellt, welche jeweils Ventilanordnungen 20 mit vier Ein- bzw. Auslaßventilen aufweisen. Hiervon sind in der Figur die kreisförmigen Ventilsitze 23 erkennbar.FIG. 2 shows a first variant of the solution in this regard. In this case, four cylinders 24 of the cylinder bank of an internal combustion engine are shown schematically in the lower part of the figure, which each have valve assemblies 20 with four inlet and outlet valves. Of these, the circular valve seats 23 can be seen in the figure.

Des Weiteren sind in der Figur für eine der Nockenwellen vier Nockenwellenlager 22 angedeutet, die sich jeweils zwischen zwei Ventilen eines Zylinders befinden. In den Nockenwellenlagem 22 wird eine Nockenwelle (nicht dargestellt) drehbar gelagert, wobei in der Regel ein zweiteiliger Aufbau der Nockenwellenlager aus einer Basis und einer darüber befestigten Kappe (in Figur 2 weggelassen) vorliegt (vgl. EP 1 350 931 A1). Schließlich sind in Figur 2 noch für den ersten Zylinder 24 zwei zur genannten Nockenwellenreihe gehörige Ventilstößel 21 angedeutet. Zur Vereinfachung der Darstellung sind diese bei den übrigen Zylindern weggelassen.Furthermore, four camshaft bearings 22 are indicated in the figure for one of the camshafts, which are each located between two valves of a cylinder. A camshaft (not shown) is rotatably mounted in the camshaft bearings 22, wherein a two-part construction of the camshaft bearing is generally made of a base and a cap (omitted in FIG. 2) (see EP 1 350 931 A1). Finally, in FIG. 2, two valve tappets 21 associated with said camshaft row are indicated for the first cylinder 24. To simplify the illustration, these are omitted in the other cylinders.

Im oberen Teil von Figur 2 ist eine erfindungsgemäße Montagevorrichtung 10 zur Montage von Ventilstößeln 21 auf Ventilschäften dargestellt. Die rotationssymmetrische Vorrichtung 10 weist große Ähnlichkeit mit einer Nockenwelle auf und umfaßt im Kern eine Welle 13 aus Walzstahl. Bei jedem der Zylinder 24 hat diese Welle 13 einen Lagerbereich 11 sowie links und rechts hieran angrenzend jeweils einen Stempelbereich 12. Die Lagerbereiche 11 befinden sich exakt an den Positionen der Drehlager einer zugehörigen Nockenwelle bzw. an den Positionen der Nockenwellenlager 22 auf dem Zylinderkopf. Der Durchmesser der Lagerbereiche 11 entspricht typischerweise dem Durchmesser der entsprechenden Nockenwelle an dieser Stelle zuzüglich der doppelten Breite des Nockenwellenspaltes (d.h. dem Spalt zwischen einem Nockenwellenlager 22 und einer darin befindlichen Nockenwelle).In the upper part of Figure 2, a mounting device 10 according to the invention for the assembly of valve tappets 21 is shown on Ventilschäften. The rotationally symmetrical device 10 has great similarity with a camshaft and comprises in the core a shaft 13 made of rolled steel. In each of the cylinders 24, this shaft 13 has a bearing portion 11 and adjacent thereto to the left and right each a punch area 12. The bearing portions 11 are located exactly at the positions of the pivot bearing of an associated camshaft or at the positions of the camshaft bearing 22 on the cylinder head. The diameter of the bearing portions 11 typically corresponds to the diameter of the corresponding camshaft at that location plus twice the width of the camshaft nip (i.e., the gap between a camshaft bearing 22 and a camshaft therein).

Die Stempelbereiche 12 befinden sich an den Stellen, wo bei der zugehörigen Nockenwelle die Nocken sitzen, und sie sind im dargestellten Beispiel zylindrisch ausgebildet. Der Durchmesser D dieser Stempelbereiche 12 entspricht dem Doppelten des minimalen Radius bzw. Basisradius R der zugehörigen Nocken zuzüglich dem gewünschten Spiel L: D = 2·(R+L).The punch areas 12 are located at the locations where the cams are seated in the associated camshaft, and they are cylindrical in the example shown. The diameter D of these punch areas 12 is twice the minimum radius or basic radius R of the associated cams plus the desired clearance L: D = 2 * (R + L).

Die Montage der Ventilanordnungen 20 bei einer Zylinderreihe gemäß Figur 2 beginnt damit, daß die Ventilelemente mit den Ventilschäften sowie die Ventilstößel 21 und andere einzelne Komponenten der Ventilanordnungen (beispielsweise Ventilschaftdichtungen oder die Ventilfeder) bei allen zu einer Nockenwelle gehörenden Ventilen in den Bohrungen des Zylinderkopfes vormontiert werden. Bei dieser Vormontage werden die Ventilstößel 21 nur ein kleines Stück auf die zugehörigen Ventilschäfte 25 aufgesteckt, so daß sie dort zwar halten, jedoch für das Erreichen ihrer endgültigen Position noch weiter aufgeschoben werden müssen. Dieses weitere Aufschieben wird dann mit der Montagevorrichtung 10 vorgenommen, wobei die Ventilschäfte jeweils durch eine Fixierung des zugehörigen Ventils fest in ihrem Platz gehalten werden. Diese Fixierung kann beispielsweise durch entsprechende (ein- oder mehrteilige) Stempel bzw. Stanzwerkzeuge von der Brennkammer her erfolgen (nicht dargestellt). Alternativ kann auch ein hoher Gas- oder Flüssigkeitsdruck im Inneren der Brennkammer des Motors erzeugt werden, welcher eine Öffnungsbewegung der Ventile verhindert.The assembly of the valve assemblies 20 in a cylinder bank of Figure 2 begins with the valve members with the valve stems and the valve lifters 21 and other individual components of the valve assemblies (eg, valve stem seals or the valve spring) in all of a camshaft Valves are pre-assembled in the holes of the cylinder head. In this pre-assembly, the valve lifters 21 are only a small piece attached to the associated valve stems 25, so that while they hold there, but still need to be postponed for reaching their final position. This further pushing is then carried out with the mounting device 10, wherein the valve stems are held firmly in place by a fixation of the associated valve. This fixation can be done for example by appropriate (one or more parts) punch or punching tools from the combustion chamber forth (not shown). Alternatively, a high gas or liquid pressure can be generated in the interior of the combustion chamber of the engine, which prevents an opening movement of the valves.

Die Montagevorrichtung 10 wird sodann mit den Lagerbereichen 11 in die zugehörigen Nockenwellenlager 22 eingelegt. Während dieses Vorgangs drücken die Stempelbereiche 12 simultan auf die Ventilstößel 21, so daß diese weiter auf die Ventilschäfte aufgeschoben werden. Wenn die Lagerbereiche 11 ihre formschlüssig definierte Position in den Nockenwellenlagern 22 erreichen, haben auch die Ventilstößel 21 ihre korrekte, definierte Positionierung auf den Ventilschäften erreicht. Da jegliche von einem Monteur oder einem Montageroboter ausgeübte Bewegung über die Montagevorrichtung 10 auf die Ventilstößel übertragen wird, ist dieses Positionierungsverfahren äußerst robust gegen Schwankungen im Montageprozeß. Durch das Einsetzen des Werkzeugs 10 in die Nockenwellenlager 22 kann somit in einfacher Weise an allen Ventilanordnungen 20 gleichzeitig eine korrekte Positionierung der Ventilstößel auf den Ventilschäften gewährleistet werden.The mounting device 10 is then inserted with the bearing areas 11 in the associated camshaft bearing 22. During this process, the punch areas 12 press simultaneously on the valve tappets 21, so that they are further pushed onto the valve stems. When the bearing areas 11 reach their form-fittingly defined position in the camshaft bearings 22, the valve tappets 21 have also reached their correct, defined positioning on the valve stems. Since any movement exerted by a fitter or an assembly robot is transmitted to the valve lifters via the fixture 10, this positioning method is extremely robust to variations in the assembly process. By inserting the tool 10 in the camshaft bearing 22 can thus be ensured in a simple manner to all valve assemblies 20 at the same time correct positioning of the valve lifters on the valve stems.

Zum Abschluß des Verfahrens wird die endgültige, feste Verbindung zwischen den Ventilstößeln 21 und den Ventilschäften hergestellt, wofür insbesondere das Bonding, die Preßverbindung, das Klemmen und das Kleben geeignet sind. Vorteilhaft an diesen Verbindungsarten ist, daß sie ihre Wirkung unmittelbar beim Aufstecken des Ventilstößels auf den Ventilschaft entfalten, in der Regel als nach der Positionierung keine besondere Tätigkeit mehr erforderlich ist.To complete the process, the final, firm connection between the valve tappets 21 and the valve stems is made, for which in particular the bonding, the press connection, the clamping and the gluing are suitable. An advantage of these types of connection is that they unfold their effect directly when attaching the valve stem to the valve stem, as a rule after positioning no special activity is required.

Es sei darauf hingewiesen, daß Figur 2 nur eine möglichst einfache Ausführungsform einer Montagevorrichtung 10 zeigt. Andere Ausführungsformen könnten beispielsweise nicht-rotationssymmetrisch sein oder mit Gelenken oder Verbindungen zu Aktuatoren und/oder anderen Bauteilen ausgestattet sein. Ferner könnte das Werkzeug 10 auch Halteeinrichtungen aufweisen, mit denen vormontierte Ventilstößel bzw. weitere Komponenten wie eine Ventilschaftdichtung oder die Ventilfeder von einer Zufuhr zum Zylinderkopf transportiert und dort auf die Ventilschäfte aufgesetzt werden könnten.It should be noted that Figure 2 shows only the simplest possible embodiment of a mounting device 10. Other embodiments could, for example, be non-rotationally symmetric or be equipped with joints or connections to actuators and / or other components. Furthermore, the tool 10 could also have holding devices with which preassembled valve tappets or other components such as a valve stem seal or the valve spring could be transported by a supply to the cylinder head and placed there on the valve stems.

Das in Figur 2 dargestellte System kommt für die korrekte Positionierung der Ventilstößel im Prinzip ohne den Einsatz von Sensoren aus (wenngleich natürlich optional Sensoren verwendet werden können). Demgegenüber zeigt Figur 3 eine Variante, bei welcher ein Sensor 111 die Positionierung eines Ventilstößels 21 auf einem Ventilschaft 25 überwacht. Der Ventilstößel wird dabei von einer ein- oder mehrteiligen Stanzvorrichtung 110 bis zum Erreichen der gewünschten Position auf den Ventilschaft 25 gedrückt, während der Ventilschaft 25 gleichzeitig festgehalten wird. Der Sensor 111 zeigt in diesem Falle an, wann das Aufschieben zu stoppen ist. Für die Messungen geeignete Sensoren 111 sind beispielsweise ein Kontaktsensor, ein Näherungssensor, ein Ultraschallsensor, eine Lichtschranke oder dergleichen.The system shown in Figure 2 is effective for the correct positioning of the valve lifters in principle without the use of sensors (although of course optional sensors can be used). In contrast, FIG. 3 shows a variant in which a sensor 111 monitors the positioning of a valve tappet 21 on a valve stem 25. The valve stem is pressed by a one-piece or multi-part punching device 110 until reaching the desired position on the valve stem 25, while the valve stem 25 is held simultaneously. The sensor 111 indicates in this case, when the postponement is to be stopped. Sensors 111 suitable for the measurements are, for example, a contact sensor, a proximity sensor, an ultrasonic sensor, a light barrier or the like.

Falls als Verbindungsmethode zwischen Ventilschaft 25 und Ventilstößel 21 das Reibschweißen gewählt wird, bei welchem der Ventilschaft 25 zur Erzeugung von Hitze in Rotation versetzt wird, muß zusätzlich zur Höhe des Ventilstößels 21 auch die Höhe des Ventilschaftes 25 relativ zum Nockenwellenlager 22 gemessen werden.If the friction welding is selected as the connection method between valve stem 25 and valve stem 21, in which the valve stem 25 is rotated to generate heat, in addition to the height of the valve stem 21, the height of the valve stem 25 must be measured relative to the camshaft bearing 22.

Die Position von Ventilstößel 21 und/oder Ventilschaft 25 kann individuell in Bezug auf jeweils einen Referenzpunkt gemessen werden, zum Beispiel in Bezug auf das zugeordnete Nockenwellenlager 22 oder den Ventilsitz (nicht dargestellt). Alternativ kann der Referenzpunkt für die einzustellende Höhe des Ventilstößels 21 auch als Mittelwert von zwei Referenzpunkten am Zylinderkopf bestimmt werden, beispielsweise als Mittelpunkt der Positionen von zwei (benachbarten) Nockenwellenlagern 22.The position of the valve lifter 21 and / or valve stem 25 may be measured individually with respect to each reference point, for example, with respect to the associated camshaft bearing 22 or valve seat (not shown). Alternatively, the reference point for the height to be set of the valve tappet 21 can also be determined as the mean value of two reference points on the cylinder head, for example as the center of the positions of two (adjacent) camshaft bearings 22.

Claims (9)

  1. Device (10, 110) for mounting at least one valve arrangement (20), in which a valve tappet (21) is connected fixedly to a valve stem (25), the device being designed for setting a defined positioning of the valve tappet (21) on the premounted valve stem (25) before final connection between the valve tappet (21) and valve stem (25), characterized in that the device contains at least one bearing region (11) with at least one adjacent ram region (12), the bearing region (11) being capable of being introduced into a camshaft bearing (22) whilst the ram region (12) at the same time presses the valve tappet (21) premounted on the valve stem (25) into its defined position.
  2. Device (10) according to Claim 1, characterized in that it is designed in order to bring about a positioning in parallel in a plurality of valve arrangements (20) belonging to a camshaft.
  3. Device (110) according to Claim 1 or 2, characterized in that it contains at least one sensor (111), by means of which the current position of the valve tappet (21) and/or of the valve stem (25) can be detected.
  4. Device (10, 110) according to at least one of Claims 1 to 3, characterized in that it contains means for fixing the position of the valve stem (25), preferably for fixing in the closing position of the valve.
  5. Device (10, 110) according to at least one of Claims 1 to 4, characterized by holding means for holding parts of the valve arrangement (20) for their transport to the mounting location.
  6. Method for mounting a valve arrangement (20) by means of a device according to one of the preceding claims, which contains at least one bearing region (11) with at least one adjacent ram region (12), comprising the steps:
    a) premounting of a valve stem (25) in the cylinder head of an internal combustion engine;
    b) premounting of a valve tappet (21) on the valve stem (25);
    c) further pushing of the valve tappet (21) onto the valve stem (25) until a defined position is reached, the bearing region (11) being introduced into the associated camshaft bearing, whilst the ram region (12) at the same time presses the valve tappet premounted on the valve stem (25) into its defined position;
    d) Production of a fixed connection between the valve tappet (21) and the valve stem (25).
  7. Method according to Claim 6, characterized in that the reaching of the defined positioning is sensor-monitored.
  8. Method according to Claim 6 or 7, characterized in that the defined positioning is determined in relation to the position of one or more reference points on the carrier (22) of the valve arrangement.
  9. Method according to at least one of Claims 6 to 8, characterized in that the defined positioning is determined in relation to the averaged position of two reference points on the carrier (22) of the valve arrangement.
EP04100536A 2004-02-12 2004-02-12 Device and method for assembling a valve mechanism Expired - Lifetime EP1563961B1 (en)

Priority Applications (2)

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EP04100536A EP1563961B1 (en) 2004-02-12 2004-02-12 Device and method for assembling a valve mechanism
DE502004002084T DE502004002084D1 (en) 2004-02-12 2004-02-12 Device and method for mounting a valve assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04100536A EP1563961B1 (en) 2004-02-12 2004-02-12 Device and method for assembling a valve mechanism

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EP1563961A1 EP1563961A1 (en) 2005-08-17
EP1563961B1 true EP1563961B1 (en) 2006-11-22

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Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191503947A (en) * 1915-03-12 1915-10-21 Marc Birkigt Improvements in or relating to Valve Gears, particularly for Explosion Engines.
US4022583A (en) * 1974-10-11 1977-05-10 K-Line Industries, Inc. Methods for assembling and disassembling valve assemblies
JPS6172810A (en) * 1984-09-18 1986-04-14 Toyota Motor Corp Valve mechanism
US4654944A (en) * 1985-09-13 1987-04-07 Graf Richard W Overhead cam valve spring compressor adapter
JPS62186006A (en) * 1986-02-10 1987-08-14 Fuji Heavy Ind Ltd Direct-acting type valve device for internal combustion engine
DE4117406A1 (en) * 1991-05-28 1992-12-03 Freudenberg Carl Fa VALVE DRIVE IN THE CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
US5226229A (en) * 1991-08-29 1993-07-13 Pierce Daniel H Self-locking valve spring retainer
US5207196A (en) * 1992-07-31 1993-05-04 Trw Inc. Pre-assembled unit for engine valve system
JPH0681615A (en) * 1992-09-02 1994-03-22 Nissan Motor Co Ltd Direct acting type valve driving mechanism
EP1375842A1 (en) * 2002-06-19 2004-01-02 Ford Global Technologies, Inc., A subsidiary of Ford Motor Company Valve arrangement for an internal combustion engine and manufacturing method

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