WO1997024525A1 - Internal-combustion engine - Google Patents

Internal-combustion engine Download PDF

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Publication number
WO1997024525A1
WO1997024525A1 PCT/DE1996/001711 DE9601711W WO9724525A1 WO 1997024525 A1 WO1997024525 A1 WO 1997024525A1 DE 9601711 W DE9601711 W DE 9601711W WO 9724525 A1 WO9724525 A1 WO 9724525A1
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WO
WIPO (PCT)
Prior art keywords
roller
fixing element
hardened
wear
rocker arm
Prior art date
Application number
PCT/DE1996/001711
Other languages
German (de)
French (fr)
Inventor
Jürgen KIRSCHNER
Maximilian Kronberger
Alain Amblard
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1997024525A1 publication Critical patent/WO1997024525A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers

Definitions

  • the invention is based on a racing machine according to the preamble of claim 1.
  • each cylinder of the internal combustion engine to be supplied is a separate one
  • Associated fuel injector This is controlled via a cam drive that has a rocker arm that can be pivoted about a fixed bearing point. Upstream of this rocker arm is a roller running on a cam track of a camshaft, which transmits lifting and lowering movements to a drive part which is operatively connected to the fuel injection device.
  • the racing engine according to the invention with the characterizing features of claim 1 has the advantage that the mileage of the components can be significantly increased by at least one hardened running surface of the roller bolt and / or the roller.
  • the roller advantageously runs on a hardened running surface of the roller bolt, which can be both rotatably and rotatably mounted in a rocker arm.
  • a liner is mounted between a roller pin and a roller, and at least one of the running surfaces between the roller pin and bush and between the liner and roller is hardened.
  • the hardened running surfaces of roller bolts and / or rollers can advantageously have a hardness of at least 50 HRC.
  • the running surfaces have at least one wear-resistant coating.
  • the wear-resistant coating can additionally increase the wear resistance.
  • This wear-resistant coating can be applied to both a hardened tread and an uncured tread. When the coating is applied to the hardened running surfaces, a high degree of wear resistance can be achieved.
  • the wear-resistant Eetikunc can be made from titanium nitrite or by a carbon-containing coating. This can have a layer thickness in the ⁇ range in order to meet the requirements.
  • a vacuum coating method is advantageously used to apply the coating.
  • the roller bolt has a fixing element for axially securing it in the transmission element, with further components running directly on the roller bolt, such as the roller or the shaft, having an end-face receptacle for mounting the axial one Backup has.
  • at least one recess can be provided in the end-side recess of the components which can be arranged directly on the roller bolt, in which a larger amount of lubricant can be stored, so that there can be an adequate supply of lubricant which can additionally increase the wear resistance.
  • FIG. 1 shows a side view of a cam drive
  • FIG. 2 shows a schematic cross-sectional illustration along the line II-II
  • FIG. 3 shows a schematic cross-section of an alternative embodiment to FIG. 2
  • FIG. 4 shows a schematic Cross section of a further alternative embodiment
  • FIG. 5 shows a schematic cross section of the alternative embodiment analogous to FIG. 3.
  • FIG. 1 shows a section of a cylinder head of a racing engine which has a cam drive 11, only the parts essential to the invention being shown.
  • a rotating camshaft 12 with a cam 13 having a cam track is arranged inside the cylinder head of the engine.
  • the rocker arm 16 is arranged pivotably about the bearing axis 18 and actuates a pump nozzle 21 via a drive part 19.
  • Such a cam drive 11 can furthermore be used to drive valve controls, pump pistons or the like.
  • the roller 14 is mounted on a roller pin 22 so as to be rotatable about an axis of rotation 23, which at the same time forms a longitudinal central axis of the roller pin 22.
  • the roller pin 22 can be mounted in the rocker arm 16 in a rotationally fixed or freely rotatable manner.
  • FIG. 2 shows a schematic cross section along the line II-II in FIG. 1.
  • the roller pin 22 is rotatably supported in the rocker arm 16. This has a running surface 23 which interacts with a running surface 24 of the rocker arm 16 and with a running surface 26 of the roller 14.
  • a first embodiment for improving the wear resistance is the hardened formation of the running surface 23 of the roller bolt 22.
  • the running surface 23 of the Roller bolt 22 and the tread 26 of roller 14 are hardened.
  • the tread 24 of the bore of the rocker arm 16 can be hardened.
  • the roller bolt 22 can be hardened and have a wear protection layer.
  • the roller 26 can have a hardened tread 26 or a hardened tread 26 formed with a wear-resistant coating. It is also self-evident that the roller pin 22 can, for example, be hardened and provided with a wear coating, whereas the running surface of the roller 14 can be untreated or is only provided with a wear coating.
  • FIG. 3 shows a schematic cross section analogous to FIG. 2, the roller bolt 22 having a fixing element 27 which can be arranged in a groove 28 of the roller bolt 22.
  • the roller pin 22 can be secured in its axial position relative to the rocker arm 16.
  • the roller 14 has a recess 31 on an end facing the fixing element 27, which on the one hand provides a space for the fixing element 27 and on the other hand enables the fixing element 27 to be installed.
  • This recess 31 additionally has pocket-shaped depressions 32 which, for example, can also be formed as groove-shaped depressions.
  • the two depressions 32 are arranged offset from one another by 180 °.
  • a plurality of depressions 32 arranged around the circumference can be provided, which are used to hold and store lubricants.
  • the wear resistance can additionally the wear protection measures described in Fig. 2 are increased by the lubrication.
  • the roller pin 22 can be arranged both rotatably and non-rotatably in the rocker arm 16.
  • a Euchse 33 is mounted on this, on which in turn the roller 22 is rotatably arranged.
  • the follower 33 has a tread 34 facing the roller pin 22, which corresponds to the inside diameter, and a tread 36 facing the roller 14, which corresponds to its outside diameter.
  • the treads 23, 24, 26, 34, 36 can be untreated, hardened, also hardened and provided with a protective layer, whereby any combination of the treads and their wear protection measures can be provided with one another.
  • FIG. 5 shows an alternative embodiment to FIG. 4, which, in analogy to FIG. 3, also has an axial fixing element 27 in a groove 28 of the roller bolt 22.
  • the socket 33 which is directly associated with the fixing element 27 is made shorter in relation to the width of the roller 14, so that a recess corresponding to the recess 31 in FIG. 3 is thereby formed.
  • the socket 33 On the face side, the socket 33 has a recess 32, which in turn serves to hold lubricants.
  • the roll 14 remains in its original shape and overlaps the beech 33, which is shorter in relation to it.
  • a recess 31 according to FIG. 3 can be made in a socket with a larger wall thickness.

Abstract

The invention concerns an internal-combustion engine which is fitted with a cam drive (11) designed to drive engine components, the drive having a pivoting rocker arm (16) mounted in the cylinder head and, mounted in the rocker arm (16), a roller (14) which follows the motion of a cam (13) on a camshaft (12), at least one of the contact surfaces (23, 26) of the roller (14) and/or its mounting pin (22) being hardened.

Description

BrennkraftmaschineInternal combustion engine
Stand der TechnikState of the art
Die Erfindung geht von einer Erennkraftmaschine nach der Gattung des Patentanspruchs 1 aus.The invention is based on a racing machine according to the preamble of claim 1.
Bei einer solchen, aus der DE-OS 3S 26 144 AI bekannten, Brennkraftmaschine ist jedem Zylinder der zu versorgenden Erennkraftmaschine eine separateIn such an internal combustion engine, known from DE-OS 3S 26 144 AI, each cylinder of the internal combustion engine to be supplied is a separate one
Brennstoffeinspritzeinrichtung zugeordnet. Diese wird über einen Nockenantrieb gesteuert, der einen um einen festen Lagerpunkt schwenkbaren Kipphebel aufweist. An diesem Kipphebel ist eine auf einer Nockenbahn einer Nockenwelle ablaufende Rolle vorgelagert, die Hub- und Senkbewegungen auf ein mit der Brennstoffeinspritzeinrichtung wirkverbundenes Antriebsteil überträgt.Associated fuel injector. This is controlled via a cam drive that has a rocker arm that can be pivoted about a fixed bearing point. Upstream of this rocker arm is a roller running on a cam track of a camshaft, which transmits lifting and lowering movements to a drive part which is operatively connected to the fuel injection device.
An derartige Nockenantriebe sind jedoch besondere Anforderungen hinsichtlich der Lebensdauer gegeben, da diese im Schadensfall nur sehr kostspielig ausgetauscht werden können. A.uf die Rolle und den Rollenbolzen wirken hohe Belastungen, die durch die hohen zu übertragenden Kräfte auftreten können. Dadurch kann es zu einem erhöhten Verschleiß kommen, der zu einer Verkürzung der Lebensdauer und Beschädigung der Komponenten führen kann.However, there are special requirements regarding the service life of such cam drives, since they can only be replaced very costly in the event of damage. A high loads act on the roller and the roller pin, which can occur due to the high forces to be transmitted. This can lead to an increased Wear occurs, which can shorten the lifespan and damage the components.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Erennkraftmaschine mit den kennzeichnenden Merkmalen des Patentanspruchs l hat demgegenüber den Vorteil, daß durch zumindest eine gehärtete Lauffläche des Rollenbolzens und/oder der Rolle die Laufleistung der Komponenten wesentlich erhöht sein kann. Vorteilhafterweise läuft die Rolle auf einer gehärteten Lauffläche des Rollenbolzens, der sowohl drehfest alε auch drehbar in einem Kipphebel gelagert εein kann.The racing engine according to the invention with the characterizing features of claim 1 has the advantage that the mileage of the components can be significantly increased by at least one hardened running surface of the roller bolt and / or the roller. The roller advantageously runs on a hardened running surface of the roller bolt, which can be both rotatably and rotatably mounted in a rocker arm.
Nach einer vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, daß zwischen einem Rollenbolzen und einer Rolle eine Euchεe gelagert ist, und zumindest eine der Laufflächen zwischen Rollenbolzen und Buchse und zwischen Euchse und Rolle gehärtet auεgebildet ist. Dadurch kann auch bei einer derartigen Ausführungsform eine erhöhte Verεchleißfeεtigkeit gegeben εein. Die gehärteten Laufflächen von Rollenbolzen und/oder Rolle können vorteilhafterweise eine Härte von mindestens 50 HRC aufweisen.According to an advantageous embodiment of the invention, it is provided that a liner is mounted between a roller pin and a roller, and at least one of the running surfaces between the roller pin and bush and between the liner and roller is hardened. As a result, increased wear resistance can also exist in such an embodiment. The hardened running surfaces of roller bolts and / or rollers can advantageously have a hardness of at least 50 HRC.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist vorgeεehen, daß die Laufflächen zumindest eine verschleißfeste Beschichtung aufweiεen. Durch die verschleißfeste Beschichtung kann die Verschleißteεtigkeit zusätzlich erhöht sein. Diese verschleißfeste Beschichtung kann sowohl auf einer gehärteten Lauffläche als auch auf einer nicht gehärteten Lauffläche aufgetragen werden. Bei dem Auftrag der Beschichtung auf die gehärteten Laufflächen kann in hohem Maße eine hohe Verschleißfeεtigkeit erzielt werden. Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist vorgeεehen, daß die verschleißfeste Eeschichtunc aus Titan-Nitrit oder durch eine kohlenstoffhaltige Beschichtung herstellbar iεt. Diese kann eine Schichtdicke im μ-Eereich aufweisen, um den Anforderungen zu genügen. Vorteilhafter¬ weise wird ein Vakuum-Beεchichtungsverfahren zum Auftragen der Eeschichtung verwendet werden.According to a further advantageous embodiment of the invention, it is provided that the running surfaces have at least one wear-resistant coating. The wear-resistant coating can additionally increase the wear resistance. This wear-resistant coating can be applied to both a hardened tread and an uncured tread. When the coating is applied to the hardened running surfaces, a high degree of wear resistance can be achieved. According to a further advantageous embodiment of the invention, it is provided that the wear-resistant Eeschichtunc can be made from titanium nitrite or by a carbon-containing coating. This can have a layer thickness in the μ range in order to meet the requirements. A vacuum coating method is advantageously used to apply the coating.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung iεt vorgesehen, daß der Rollenbolzen ein Fixierelement zu dessen axialer Sicherung im Ubertragungselement aufweist, wobei daε weitere unmittelbar auf dem Rollenbolzen laufende Eauteil , wie beispielsweise die Rolle oder die Euchεe, eine stirnε≤itige Aufnahme zur Montage der axialen Sicherung aufweiεt. Zusätzlich kann in der stimseitigen Ausnehmung der unmittelbar auf dem Rollenbolzεn anordenbaren Eauteile zumindest eine Vertiefung vorgesehen, in der ein größerer Eetrag an Schmiermittel εpeicherbar ist, εo daß eine hinreichende Schmiermittelversorgung gegeben εein kann, die zusätzlich die Verschleißfeεtigkeit erhöhen kann.According to a further advantageous embodiment of the invention, it is provided that the roller bolt has a fixing element for axially securing it in the transmission element, with further components running directly on the roller bolt, such as the roller or the shaft, having an end-face receptacle for mounting the axial one Backup has. In addition, at least one recess can be provided in the end-side recess of the components which can be arranged directly on the roller bolt, in which a larger amount of lubricant can be stored, so that there can be an adequate supply of lubricant which can additionally increase the wear resistance.
Weitere Vorteile und vorteilhafte Ausgestaltungen deε Gegenεtandes der Erfindung sind der Zeichnung, der Beschreibung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the object of the invention can be found in the drawing, the description and the claims.
Zeichnungdrawing
Ein Ausführungsbeispiel des Gegenstandes der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen die Fig. 1 eine Seitenansicht auf einen Nockenantrieb, die Fig. 2 eine εchematische Querschnittdarstellung entlang der Linie II-II, die Fig. 3 einen εchematiεchen Querschnitt einer alternativen Ausführungsform zu Fig. 2, die Fig. 4 einen schematischen Querschnitt einer weiteren alternativen Ausführungsform und die Fig. 5 einen schematischen Querschnitt der alternativen Ausführungsform analog zu Fig. 3.An embodiment of the object of the invention is shown in the drawing and is explained in more detail below. 1 shows a side view of a cam drive, FIG. 2 shows a schematic cross-sectional illustration along the line II-II, FIG. 3 shows a schematic cross-section of an alternative embodiment to FIG. 2, and FIG. 4 shows a schematic Cross section of a further alternative embodiment and FIG. 5 shows a schematic cross section of the alternative embodiment analogous to FIG. 3.
Eeschreibung des AusführungsbeispielsDescription of the embodiment
Die Fig. 1 zeigt einen Ausschnitt aus einem Zylinderkopf einer Erennkraftmaschine, die einen Nockenantrieb 11 aufweiεt, wobei nur die für die Erfindung wesentlichen Teile dargestellt sind. Innerhalb des Zylinderkopfeε der Erennkraftmaεchine iεt eine umlaufende Nockenwelle 12 mit einem eine Nockenbahn aufweisenden Nocken 13 angeordnet. Dieεer betätigt über eine auf der Nockenbahn laufende Rolle 14 einen Kipphebel 16, der über ein Lager 17 drehfest zum Zylinderkopf verbunden iεt. Der Kipphebel 16 iεt um die Lagerachse 18 schwenkbar angeordnet und betätigt über ein Antriebsteil 19 eine Pumpendüεe 21. Ein derartiger Nockenantrieb 11 kann desweiteren zum Antrieb von Ventilsteuerungen, Pumpenkolben oder dergleichen dienen.1 shows a section of a cylinder head of a racing engine which has a cam drive 11, only the parts essential to the invention being shown. A rotating camshaft 12 with a cam 13 having a cam track is arranged inside the cylinder head of the engine. This operates a rocker arm 16 via a roller 14 running on the cam track, which rocker arm is connected to the cylinder head in a rotationally fixed manner via a bearing 17. The rocker arm 16 is arranged pivotably about the bearing axis 18 and actuates a pump nozzle 21 via a drive part 19. Such a cam drive 11 can furthermore be used to drive valve controls, pump pistons or the like.
Die Rolle 14 iεt auf einem Rollenbolzen 22 drehbar um eine Drehachse 23 gelagert, die gleichzeitig eine Längsmittelachεe deε Rollenbolzenε 22 bildet. Der Rollenbolzen 22 kann anwendungsspezifisch drehfest oder frei drehbar in dem Kipphebel 16 gelagert sein.The roller 14 is mounted on a roller pin 22 so as to be rotatable about an axis of rotation 23, which at the same time forms a longitudinal central axis of the roller pin 22. Depending on the application, the roller pin 22 can be mounted in the rocker arm 16 in a rotationally fixed or freely rotatable manner.
In Fig. 2 ist ein schematischer Querschnitt entlang der Linie II-II in Fig. 1 dargestellt. Der Rollenbolzen 22 iεt drehbar in dem Kipphebel 16 gelagert. Dieεer weiεt eine Lauffläche 23 auf, die mit einer Lauffläche 24 deε Kipphebels 16 und mit einer Lauffläche 26 der Rolle 14 zusammenwirkt. Eine erste Ausführungsform zur Verbesserung der Verschleißfestigkeit iεt die gehärtete Auεbildung der Lauffläche 23 des Rollenbolzenε 22. Darüber hinaus können ebenso die Lauffläche 23 des Rollenbolzenε 22 und die Lauffläche 26 der Rolle 14 gehärtet εein. Zusätzlich kann auch die Lauffläche 24 der Bohrung des Kipphebels 16 gehärtet sein.FIG. 2 shows a schematic cross section along the line II-II in FIG. 1. The roller pin 22 is rotatably supported in the rocker arm 16. This has a running surface 23 which interacts with a running surface 24 of the rocker arm 16 and with a running surface 26 of the roller 14. A first embodiment for improving the wear resistance is the hardened formation of the running surface 23 of the roller bolt 22. In addition, the running surface 23 of the Roller bolt 22 and the tread 26 of roller 14 are hardened. In addition, the tread 24 of the bore of the rocker arm 16 can be hardened.
Um eine Erhöhung einer der beiden zuvor genannten alternativen Ausführungsformen der Laufflächen 23, 26 zu erzielen, kann der Rollenbolzen 22 gehärtet εein und eine Verschleißschutzschicht aufweiεen. Die Rolle 26 kann eine gehärtete Lauffläche 26 oder eine gehärtete und mit einer verschleißfesten Eeschichtung ausgebildete Lauffläche 26 aufweisen. Es iεt ebenεo εelbstverständlich, daß der Rollenbolzen 22 beispielεweise gehärtet und mit einer Verεchleißbeεchichtung verεehen εein kann, wohingegen die Lauffläche der Rolle 14 unbehandelt εein kann oder nur mit einer Verεchleißbeεchichtung versehen ist.In order to achieve an increase in one of the two alternative embodiments of the running surfaces 23, 26 mentioned above, the roller bolt 22 can be hardened and have a wear protection layer. The roller 26 can have a hardened tread 26 or a hardened tread 26 formed with a wear-resistant coating. It is also self-evident that the roller pin 22 can, for example, be hardened and provided with a wear coating, whereas the running surface of the roller 14 can be untreated or is only provided with a wear coating.
In Fig. 3 ist ein εchematischer Querschnitt in Analogie zu Fig. 2 dargestellt, wobei der Rollenbolzen 22 ein Fixierelement 27 aufweist, welches in einer Nut 28 deε Rollenbolzens 22 anordenbar ist. Dadurch kann der Rollenbolzen 22 in seiner axialen Lage zum Kipphebel 16 gesichert sein. Die Rolle 14 weiεt an einer zum Fixierelement 27 weisenden Stirnseite eine Ausnehmung 31 auf, die einerseitε einen Bauraum für das Fixierelement 27 zur Verfügung stellt und andererεeitε die Montage des Fixierelementes 27 ermöglicht. Diese Ausnehmung 31 weiεt zusätzlich taschenförmige Vertiefungen 32 auf, die beiεpielsweiεe auch alε nutförmige Vertiefungen ausgebildet sein können. Die zwei Vertiefungen 32 sind um 180° zueinander versetzt angeordnet. Es versteht sich, daß mehrere über den Umfang verteilt angeordnete Vertiefungen 32 vorgesehen sein können, die zur Aufnahme und Speicherung von Schmiermitteln dienen. Dadurch kann die Verschleißfeεtigkeit zusätzlich zu den in Fig. 2 beschriebenen Verschleißschutzmaßnahmen durch die Schmierung erhöht werden.FIG. 3 shows a schematic cross section analogous to FIG. 2, the roller bolt 22 having a fixing element 27 which can be arranged in a groove 28 of the roller bolt 22. As a result, the roller pin 22 can be secured in its axial position relative to the rocker arm 16. The roller 14 has a recess 31 on an end facing the fixing element 27, which on the one hand provides a space for the fixing element 27 and on the other hand enables the fixing element 27 to be installed. This recess 31 additionally has pocket-shaped depressions 32 which, for example, can also be formed as groove-shaped depressions. The two depressions 32 are arranged offset from one another by 180 °. It goes without saying that a plurality of depressions 32 arranged around the circumference can be provided, which are used to hold and store lubricants. As a result, the wear resistance can additionally the wear protection measures described in Fig. 2 are increased by the lubrication.
In Fig. 4 ist eine alternative Anordnung im Querschnitt dargestellt. Der Rollenbolzen 22 kann in dieser Auεführungsform sowohl drehbar alε auch drehfest in dem Kipphebel 16 anordenbar sein. Auf diesem iεt eine Euchse 33 gelagert, auf der wiederum die Rolle 22 drehbar angeordnet iεt. Die Euchse 33 weist eine zum Rollenbolzen 22 weisende Lauffläche 34 auf, die dem Innendurchmesεer entεpricht, und eine zur Rolle 14 weisende Lauffläche 36, die ihrem Außendurchmeεεer entεpricht . Anwendungsspezifisch können die Laufflächen 23, 24, 26, 34, 36 unbehandelt, gehärtet, alε auch gehärtet und mit einer Schutzεchicht verεehen εein, wobei eine beliebige Kombination der Laufflächen und deren Verschleißschutzmaßnahmen miteinander vorgesehen εein kann.4 shows an alternative arrangement in cross section. In this embodiment, the roller pin 22 can be arranged both rotatably and non-rotatably in the rocker arm 16. A Euchse 33 is mounted on this, on which in turn the roller 22 is rotatably arranged. The follower 33 has a tread 34 facing the roller pin 22, which corresponds to the inside diameter, and a tread 36 facing the roller 14, which corresponds to its outside diameter. Depending on the application, the treads 23, 24, 26, 34, 36 can be untreated, hardened, also hardened and provided with a protective layer, whereby any combination of the treads and their wear protection measures can be provided with one another.
In Fig. 5 ist eine alternative Ausführungεform zu Fig. 4 dargestellt, die in Analogie zu Fig. 3 ebenfalls ein axiales Fixierelement 27 in einer Nut 28 des Rollenbolzens 22 aufweist. Die unmittelbar dem Fixierelement 27 zugeordnete Buchse 33 iεt im Verhältniε zur Breite der Rolle 14 kürzer auεgebildet, εo daß dadurch eine Auεnehmung entεprechend zur Auεnehmung 31 in Fig. 3 gebildet ist. Stirnseitig weiεt die Buchεe 33 eine Vertiefung 32 auf, die wiederum zur Aufnahme von Schmiermitteln dient. Die Rolle 14 bleibt in ihrer urεprünglichen Gestalt erhalten und übergreift die im Verhältnis dazu kürzer ausgebildete Buchεe 33.FIG. 5 shows an alternative embodiment to FIG. 4, which, in analogy to FIG. 3, also has an axial fixing element 27 in a groove 28 of the roller bolt 22. The socket 33 which is directly associated with the fixing element 27 is made shorter in relation to the width of the roller 14, so that a recess corresponding to the recess 31 in FIG. 3 is thereby formed. On the face side, the socket 33 has a recess 32, which in turn serves to hold lubricants. The roll 14 remains in its original shape and overlaps the beech 33, which is shorter in relation to it.
Alternativ kann auch vorgesehen εein, daß bei einer Buchse mit einer größeren Wandstärke eine Ausnehmung 31 gemäß Fig. 3 anbringbar ist. Durch die oben genannten Maßnahmen und beliebigen Kombinationsmöglichkeiten wird eine weεentliche Verbesserung des Verschleißverhaltenε eineε derartigen Rollenantriebeε erreicht, wobei der Rollenantrieb an Einspritzvorrichtungen, an der Betätigung der Gaεwechεelventile o.a. der Brennkraftmaεchine verwendet werden kann. Alternatively, it can also be provided that a recess 31 according to FIG. 3 can be made in a socket with a larger wall thickness. The abovementioned measures and any combination possibilities result in a substantial improvement in the wear behavior of such a roller drive, the roller drive being able to be used on injection devices, on the actuation of the gas exchange valves or the like of the internal combustion engine.

Claims

Anεprüche Claims
1. Erennkraftmaεchine mit einem Nockenantrieb (11), welcher einen in einem Zylincerkopf εchwenkbar gelagerten Kipphebel (16) aufweiεt, mit einer im Kipphebel (16) gelagerten Rolle (14) , die auf einer Nockenbahn einer Nocke (13) einer Nockenwelle (12) abläuft und für den Antrieb von Eauteiler. (21) vorgeεehen ist, dadurch gekennzeichnet, daß zumindest eine Lauffläche (23, 26) deε Rollenbolzenε (22) und/oder der Rolle (14) gehärtet auεgebildet iεt.1. Erennkraftmaεchine with a cam drive (11), which has a pivotably mounted in a cylinder head rocker arm (16), with a rocker arm in the rocker arm (16) (14) on a cam track of a cam (13) of a camshaft (12) expires and for the drive of Eauteiler. (21) is provided, characterized in that at least one running surface (23, 26) of the roller bolt (22) and / or the roller (14) is hardened.
2. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Rollenbolzenε (22) und der Rolle (14) eine Euchεe (33) vorgesehen ist, die eine zum Rollenbolzen (22) weisende Lauffläche (34) und eine zur Rolle (14) weisende Lauffläche (36) aufweist, und zumindest eine der Laufflächen (34, 36) gehärtet ausgebildet ist.2. Internal combustion engine according to claim 1, characterized in that between the roller bolt (22) and the roller (14) a Euchεe (33) is provided which has a roller bolt (22) facing tread (34) and a roller (14) has facing tread (36), and at least one of the treads (34, 36) is hardened.
3. Brennkraftmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zumindest eine der Laufflächen (23, 24, 34, 36) eine verschleißfeste Beschichtung aufweist. 3. Internal combustion engine according to claim 1 or 2, characterized in that at least one of the treads (23, 24, 34, 36) has a wear-resistant coating.
4. Erennkraftmaschine nach einem der vorhergehenden4. Racer according to one of the preceding
Ansprüche, dadurch gekennzeichnet, daß eine gehärtete Lauffläche (23, 24, 34, 36) eine verschleißfeste Beschichtung aufweist.Claims, characterized in that a hardened tread (23, 24, 34, 36) has a wear-resistant coating.
5. Erennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die gehärtete Lauffläche (23, 24, 34, 36) zumindest eine Härte von 50 HRC aufweiεt.5. Racing engine according to claim 1, characterized in that the hardened tread (23, 24, 34, 36) has at least a hardness of 50 HRC.
6. Erennkraftmaεchine nach Anεpruch 1, dadurch gekennzeichnet, daß der Rollenbolzen (22) zur axialen Sicherung ein Fixierelement (27) aufweiεt, und die auf dem Rollenbolzen (22) angeordnete Rolle (14) εtirnεeitig zumindeεt teilweiεe eine daε Fixierelement (27) umgreifende Auεnehmung (31) aufweiεt, in der über den Umfang verteilt zumindeεt eine εchmiermittelaufnehmende Vertiefung (32) vorgeεehen iεt.6. Erennkraftmaεchine according to Anεpruch 1, characterized in that the roller bolt (22) for axial securing a fixing element (27) has, and the roller bolt (22) arranged roller (14) on the end face at least partially a fixing element (27) encompassing a fixing element (27) (31), in which at least one recess (32) receiving lubricant is distributed over the circumference.
7. Brennkraftmaschine nach Anspruch 2, dadurch gekennzeich¬ net, daß der Rollenbolzen (22) zur axialen Sicherung ein Fixierelement (27) aufweiεt, und die Buchεe (33) mit einer Stirnεeite unmittelbar an daε Fixierelement (27) anεchließt, wobei an der zum Fixierelement (27) weiεenden Stirnεeite Vertiefungen (32) zur Aufnahme von Schmiermittel vorgesehen sind.7. Internal combustion engine according to claim 2, characterized gekennzeich¬ net that the roller bolt (22) for axial securing a fixing element (27) aufweiεt, and the Buchεe (33) with an end face directly to daε fixing element (27), where at Fixing element (27) on the end face recesses (32) are provided for receiving lubricant.
8. Brennkraftmaεchine nach Anspruch 3, dadurch ge¬ kennzeichnet, daß die verschleißfeste Beschichtung eine Titan-Nitrit-Beschichtung iεt.8. Brennkraftmaεchine according to claim 3, characterized ge indicates that the wear-resistant coating is a titanium nitride coating iεt.
9. Brennkraftmaεchine nach Anspruch 3, dadurch gekennzeichnet, daß die verschleißfeste Beschichtung eine kohlenstoffhaltige Beschichtung ist. 9. Brennkraftmaεchine according to claim 3, characterized in that the wear-resistant coating is a carbon-containing coating.
PCT/DE1996/001711 1995-12-30 1996-09-12 Internal-combustion engine WO1997024525A1 (en)

Applications Claiming Priority (2)

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DE19549223.4 1995-12-30
DE19549223A DE19549223B4 (en) 1995-12-30 1995-12-30 Internal combustion engine with a cam drive

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JP2005256656A (en) * 2004-03-10 2005-09-22 Toyota Central Res & Dev Lab Inc Roller rocker arm type valve gear
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DE102014206660A1 (en) * 2014-04-07 2015-10-08 Schaeffler Technologies AG & Co. KG stroke-transmission component
EP2960446A1 (en) * 2014-06-24 2015-12-30 Aktiebolaget SKF Mechanical system forming a cam follower or a rocker arm

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DE19549223A1 (en) 1997-07-03

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