DE4223172C1 - Cylinder head for IC engine - bearing cover for cam shaft bearing also acts for bearing for eccentric shaft - Google Patents

Cylinder head for IC engine - bearing cover for cam shaft bearing also acts for bearing for eccentric shaft

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Publication number
DE4223172C1
DE4223172C1 DE4223172A DE4223172A DE4223172C1 DE 4223172 C1 DE4223172 C1 DE 4223172C1 DE 4223172 A DE4223172 A DE 4223172A DE 4223172 A DE4223172 A DE 4223172A DE 4223172 C1 DE4223172 C1 DE 4223172C1
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DE
Germany
Prior art keywords
bearing
cylinder head
rocker arm
eccentric shaft
cover
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
DE4223172A
Other languages
German (de)
Inventor
Harald 8000 Muenchen De Unger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE4223172A priority Critical patent/DE4223172C1/en
Application granted granted Critical
Publication of DE4223172C1 publication Critical patent/DE4223172C1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—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
    • F01L1/02—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
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • 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
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/241—Cylinder heads specially adapted to pent roof shape of the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The cylinder head has a bearing with cover (15) for a camshaft (7). The cams (7a) operate rocker arms (10), which act on valves (4). The arms support themselves on eccentrics (12a), located on an eccentric shaft (12). Turning of this shaft varies the valve stroke process, caused by the cams. The bearing cover also serves for the bearing for the eccentric shaft, which is also located in the cylinder head (1). The cover guides the rocker arm. It carries a bolt (11), from which the rocker arm is suspended via a long hole (10b). The head may have two or more parallel valves, and the rocker arm to operate a common plunger (9a), is forked. It supports itself on two similar eccentrics. USE/ADVANTAGE - Simplified construction of cylinder head for IC engine.

Description

Die Erfindung betrifft einen Zylinderkopf einer Brenn­ kraftmaschine mit einem durch einen Lagerdeckel geschlos­ senen Lager für eine Nockenwelle, deren Nocken auf Hub­ ventile einwirkende Schwinghebel betätigen, die sich an Exzentern abstützen, die auf einer Exzenterwelle angeord­ net sind, wobei durch Verdrehen dieser Exzenterwelle der vom Nocken hervorgerufene Ventilhubverlauf veränderbar ist. Dabei soll sich ausdrücklich der Begriff des Schwinghebels auf all jene Übertragungselemente beziehen, die zwischen einen Nocken sowie ein Hubventil bzw. einem Hubventil-Stößel zwischengeschaltet sind, insbesondere sollen somit auch die sog. Kipp- oder Schlepphebel, aber auch irgendwelche Kulissenbahn-Elemente unter diesen Be­ griff fallen.The invention relates to a cylinder head of a burner engine with a closed by a bearing cap its bearing for a camshaft whose cams are on stroke Actuate rocking levers acting on themselves Support eccentrics arranged on an eccentric shaft are net, by rotating this eccentric shaft The valve lift curve caused by the cam can be changed is. The concept of Refer to the rocker arm to all those transmission elements, between a cam and a lift valve or a Lift valve tappets are interposed, in particular So should also the so-called. rocker arms or finger followers also any scenery elements under these Be handle falling.

Einen Zylinderkopf mit den wesentlichen Merkmalen des Oberbegriffs des ersten Patentanspruchs zeigt die DE-OS 22 56 185. Dabei dient die neben der stets vorhandenen Nockenwelle zusätzlich vorgesehene Exzenterwelle dazu, den Hubverlauf des Brennkraftmaschinen-Ventiles, so bei­ spielsweise des Einlaßventiles beliebig ändern zu können. Die charakteristischen Werte der Brennkraftmaschine im Hinblick auf Drehmoment- und Leistungsabgabe, Verbrauch sowie Schadstoffemissionen lassen sich hiermit optimie­ ren.A cylinder head with the essential features of the The preamble of the first claim shows the DE-OS 22 56 185. The serves alongside the always existing Camshaft additionally provided eccentric shaft to the stroke of the engine valve, so at for example, to be able to change the intake valve as desired. The characteristic values of the internal combustion engine in the  With regard to torque and power output, consumption and pollutant emissions can be optimized with this ren.

Allerdings verursacht diese zusätzliche Ex­ zenterwelle einen erhöhten Bauaufwand, den zu reduzieren sich die vorliegende Erfindung zur Aufgabe gestellt hat.However, this causes additional ex center shaft increased construction costs to reduce the present invention has set itself the task.

Zur Lösung dieser Aufgabe ist vorgesehen, daß der das La­ ger für die Nockenwelle schließende Lagerdeckel ebenfalls ein im Zylinderkopf vorgesehenes Lager für die Exzenter­ welle vervollständigt. Vorteilhafte Weiterbildungen der Erfindung sind Inhalt der Unteransprüche.To solve this problem it is provided that the La also for the camshaft closing bearing cover a bearing for the eccentric provided in the cylinder head wave completed. Advantageous further developments of Invention are the content of the subclaims.

Erfindungsgemäß ist/sind für die Nockenwelle sowie die Exzenterwelle ein bzw. mehrere gemeinsame(r) Lagerdeckel vorgesehen. Diese Maßnahme reduziert zum einen die Zahl der benötigten Bauteile. Darüber hinaus kann die Bearbei­ tung der Lager-Trennebenen für die Nockenwellenlager so­ wie die Exzenterwellenlager ebenfalls in einem einzigen Arbeitsgang erfolgen, so daß auch der Fertigungsprozeß deutlich vereinfacht wird. Im Sinne einer vorteilhaften Funktionsvereinigung kann darüber hinaus jeder Lager­ deckel den ihm benachbarten Schwinghebel bzw. allgemein das benachbarte zwischen der Nockenwelle sowie dem Hub­ ventil wirkende Übertragungsglied führen bzw. tragen. Im Falle eines Schwinghebels kann dieser beispielsweise an einem vom Lagerdeckel getragenen Bolzen aufgehängt sein. Ein Langloch im Schwinghebel erlaubt dabei die Ver­ schiebung desselben durch den zugeordneten Exzenter der Exzenterwelle.According to the invention is / are for the camshaft and the Eccentric shaft one or more common bearing cover intended. On the one hand, this measure reduces the number the required components. In addition, the machining tion of the bearing parting planes for the camshaft bearings like the eccentric shaft bearings also in one Work done so that the manufacturing process is significantly simplified. In the sense of an advantageous Any warehouse can also combine functions cover the neighboring rocker arm or in general the neighboring between the camshaft and the stroke Guide or carry the valve-acting transmission element. in the In the case of a rocker arm, this can be, for example a bolt carried by the bearing cap. A slot in the rocker arm allows the Ver displacement of the same by the assigned eccentric Eccentric shaft.

Für einen Zylinderkopf mit beispielsweise zwei Einlaßven­ tilen je Zylinder bietet es sich an, diese durch einen gemeinsamen Schwinghebel zu betätigen. Um jedoch eine exakte Führung dieses Schwinghebels zu ermöglichen und darüber hinaus ein Verkanten des Schwinghebels insbeson­ dere bei einer Verschiebung durch die Exzenterwelle zu verhindern, wird dieser Schwinghebel in ge­ wichtsreduzierender Weise gegabelt ausgeführt, so daß er sich an zumindest zwei gleichen Exzentern abstützen kann. Im Sinne der Bauraumreduzierung bietet es sich dabei an, zwischen den gegabelten Armen des Schwinghebels bei­ spielsweise eine Rolle zu lagern, auf die der einzige, diesen beiden Hubventilen zugeordnete Nocken einwirken kann.For a cylinder head with two intake valves, for example til each cylinder, it is advisable to use a to operate the common rocker arm. However, around one to enable exact guidance of this rocker arm and in addition, tilting of the rocker arm in particular in the event of a shift due to the eccentric shaft  prevent this rocker arm in ge weight-reducing way forked so that he can be supported on at least two identical eccentrics. In terms of the reduction in installation space, it makes sense to between the forked arms of the rocker arm play a role that the only one act on these two lift valves associated cams can.

Im folgenden wird die Erfindung anhand eines bevorzugten Ausführungsbeispieles näher erläutert. Es zeigtIn the following, the invention is based on a preferred Embodiment explained in more detail. It shows

Fig. 1 einen Querschnitt durch einen erfindungsgemäß gestalteten Brennkraftmaschinen-Zylinderkopf, wobei die Exzenterwelle so positioniert ist, daß sich bei maximalem Nockenhub ein maximaler Ventilhub ergibt, während Fig. 1 shows a cross section through an internal combustion engine cylinder head designed according to the invention, wherein the eccentric shaft is positioned so that there is a maximum valve lift at maximum cam stroke, while

Fig. 2 den gleichen Querschnitt zeigt, jedoch mit der­ art positionierter Exzenterwelle, daß sich bei maximalem Nockenhub ein minimaler Ventilhub einstellt. Fig. 2 shows the same cross section, but with the eccentric shaft positioned in such a way that a minimum valve lift occurs at maximum cam lift.

Fig. 3 zeigt eine teilweise Ansicht gemäß Pfeilrich­ tung X aus Fig. 1. Fig. 3 shows a partial view according to arrow Rich tung X in FIG. 1.

Der in den Fig. 1, 2 im Querschnitt gezeigte Zylinderkopf besitzt wie üblich einen Einlaßkanal 2, der gegenüber einem Brennraum 3 mittels eines Hubventiles 4 geöffnet bzw. geschlossen wird. Auch im Auslaßkanal 5 befindet sich ein übliches Hubventil 6. Betätigt wird das Einlaß- Hubventil 4 von einem Nocken 7a, während dem Auslaß-Hub­ ventil 6 ein Nocken 8a zugeordnet ist. Der gezeigte Zy­ linderkopf 1 ist ein Reihen-Zylinderkopf einer mehrzy­ lindrigen Brennkraftmaschine, wobei wie üblich sämtliche Einlaßnocken der senkrecht zur Zeichenebene hintereinan­ der angeordneten Zylinder Bestandteil einer Nockenwelle 7 sind, während sämtliche Auslaßnocken 8a Bestandteil einer Nockenwelle 8 sind.The cylinder head shown in cross section in FIGS . 1, 2 has, as usual, an inlet channel 2 which is opened or closed with respect to a combustion chamber 3 by means of a lift valve 4 . A conventional lift valve 6 is also located in the outlet duct 5 . The inlet lift valve 4 is actuated by a cam 7 a, while the outlet lift valve 6 is assigned a cam 8 a. The Zy shown linder head 1 is a series cylinder head of an mehrzy lindrigen internal combustion engine, wherein all the intake cam of the perpendicular to the plane of the drawing cylinders arranged part hinte reinan a cam shaft 7 as usual, while all the exhaust cams 8 are a part of a camshaft. 8

Der Auslaßnocken 8a wirkt über einen mit einer Rolle 9a versehenen Stößel 9 direkt auf das Auslaß-Hubventil 6 ein. Auch dem Einlaß-Hubventil 4 ist ein derartiger mit einer Rolle 9a versehener Stößel 9 zugeordnet. Jedoch wälzt hier auf der Rolle 9a des Stößels 9 ein Schwinghe­ bel 10 ab, der seinerseits über die an ihm befestigte Schwinghebelrolle 10a vom Nocken 7a betätigt wird. Ge­ führt wird dieser Schwinghebel durch einen Bolzen 11, der in ein Langloch 10b im Schwinghebel 10 eingreift. Ferner stützt sich der Schwinghebel 10 an einem Exzenter 12a ab. Dieser Exzenter 12a ist Bestandteil einer Exzenterwelle 12, die sich ebenso wie die Nockenwelle 7 über die ge­ samte Länge des Reihen-Zylinderkopfes 1 erstreckt. Ferner greift an einem Absatz 10c des Schwinghebels 10 ein Rück­ stellelement 13 an, das im wesentlichen aus einer Druck­ feder 13a, einem Druckelement 13b sowie einem Füh­ rungselement 13c besteht. Die Druckfeder 13a ist zwischen dem Druckelement 13b sowie dem Führungselement 13c einge­ spannt, so daß das Druckelement 13b den Schwinghebel der­ art beaufschlagt, daß die Schwinghebelrolle 10a stets am Nocken 7a und der Schwinghebel 10 selbst stets am Exzen­ ter 12a anliegt. Mit seinem Führungselement 13c ist die­ ses Rückstellelement 13 wie ersichtlich in den Zylin­ derkopf 1 eingeschraubt.The outlet cam 8 a acts directly on the outlet lift valve 6 via a plunger 9 provided with a roller 9 a. Also, the inlet poppet valve 4 is associated with such a roller 9 a-provided push rod. 9 However, here rolls on the roller 9 a of the plunger 9 a Schwinghe bel 10 , which in turn is actuated by the rocker arm roller 10 a attached to it by the cam 7 a. Ge leads this rocker arm by a bolt 11 which engages in a slot 10 b in the rocker arm 10 . Furthermore, the rocker arm 10 is supported on an eccentric 12 a. This eccentric 12 a is part of an eccentric shaft 12 which, like the camshaft 7, extends over the entire length of the in-line cylinder head 1 . Furthermore, on a shoulder 10 c of the rocker arm 10 a return adjusting element 13 , which essentially consists of a compression spring 13 a, a pressure element 13 b and a guide element 13 c. The compression spring 13 a is clamped between the pressure element 13 b and the guide element 13 c, so that the pressure element 13 b acts on the rocker arm of the type that the rocker arm roller 10 a always on the cam 7 a and the rocker arm 10 itself always on the eccentric ter 12th a is present. With its guide element 13 c, this reset element 13, as can be seen, is screwed into the cylinder head 1 .

Der Einfluß der Exzenter 12a bzw. der Exzenterwelle 12 auf den erzielbaren Hub des Einlaß-Hubventiles 4 wird durch Vergleich der Fig. 1 und 2 klar ersichtlich. In beiden Figurendarstellungen befindet sich der Nocken 7a in der Position maximalen Nockenhubes, d. h. der Schwing­ hebel 10 wird durch den Nocken 7a maximal ausgelenkt. In der Darstellung gemäß Fig. 1 befindet sich dabei die Ex­ zenterwelle 12 in einer derartigen Position und positio­ niert dabei den Schwinghebel 10 solchermaßen, daß der ma­ ximale Nockenhub den maximal möglichen Ventilhub h er­ zeugt. Bei Fig. 2 hingegen wurde wie ersichtlich die Ex­ zenterwelle um 180° gedreht. Dann nimmt auch der Schwing­ hebel 10 bezüglich des Bolzens 11 eine andere Position ein, wobei sich - wie ersichtlich - trotz maximalen Nockenhubs ein Nullhub bzw. ein lediglich minimalster Hub für das Einlaß-Hubventil 4 ergibt.The influence of the eccentric 12 a or the eccentric shaft 12 on the achievable stroke of the inlet lift valve 4 can be clearly seen by comparing FIGS. 1 and 2. In both figure representations, the cam 7 a is in the position of maximum cam stroke, ie the rocking lever 10 is maximally deflected by the cam 7 a. In the illustration of FIG. 1 is in this case the zenterwelle Ex 12 in such a position and positio ned thereby the swing lever 10 in a manner such that the ma ximum cam lift h the maximum possible valve lift he witnesses. In Fig. 2, however, as can be seen, the Ex center shaft was rotated by 180 °. Then the rocker arm 10 takes a different position with respect to the pin 11 , which - as can be seen - results in a zero stroke or a minimal stroke for the inlet lift valve 4 despite the maximum cam stroke.

Die Auslaß-Nockenwelle 8 ist in bekannter Weise im Zylin­ derkopf 1 gelagert. Dazu ist im Zylinderkopf 1 eine nicht gezeigte Lagerhalbschale vorgesehen, die durch einen La­ gerdeckel 14 zu einem vollständigen Lager geschlossen wird. In gleicher Weise ist auch die Einlaß-Nockenwelle 7 gelagert, d. h. auch hier besitzt der Zylinderkopf 1 eine nicht gezeigte Lagerhalbschale, die durch einen Lager­ deckel 15 zu einem vollständigen Lager für die Nocken­ welle 7 ergänzt wird. Wie angedeutet, sind diese Lager­ deckel 14, 15 mittels Schrauben 16 am Zylinderkopf 1 be­ festigt. Der Lagerdeckel 15 nimmt jedoch nicht nur die Nockenwelle 7 auf, sondern dient in gleicher Weise der Lagerung der Exzenterwelle 12. Auch für diese Exzenter­ welle 12 sind im Zylinderkopf 1 in üblicher Weise Lager­ halbschalen (nicht gezeigt) vorgesehen, die durch mehrere Lagerdeckel 15 zu mehreren Lagern für diese Exzenterwelle 12 vervollständigt werden. Fig. 3 zeigt drei Stück der­ artiger hintereinander angeordneter Lagerdeckel 15. Wei­ terhin tragen zwei nebeneinander angeordnete Lagerdeckel 15 jeweils einen Bolzen 11, der - wie bereits oben erläu­ tert - den Schwinghebel 10 führt. In einer vorteilhaften Funktionsvereinigung übernimmt somit ein einziger Lager­ deckel 15 mehrere Funktionen.The exhaust camshaft 8 is mounted in a known manner in the Zylin derkopf 1 . For this purpose, a bearing half-shell (not shown ) is provided in the cylinder head 1 , which is closed by a bearing cap 14 to form a complete bearing. In the same way, the inlet camshaft 7 is mounted, ie here, too, the cylinder head 1 has a bearing half-shell, not shown, which is complemented by a bearing cover 15 to a complete bearing for the cam shaft 7 . As indicated, these bearing covers 14 , 15 are fastened by means of screws 16 to the cylinder head 1 . However, the bearing cover 15 not only receives the camshaft 7 , but also serves to support the eccentric shaft 12 in the same way. Also for this eccentric shaft 12 , half-shells (not shown) are provided in the cylinder head 1 in the usual way, which are completed by a plurality of bearing caps 15 to form a plurality of bearings for this eccentric shaft 12 . Fig. 3 shows three pieces of the like one behind the other bearing caps 15 . Wei terhin carry two side by side bearing caps 15 each have a pin 11 which - as already explained above - leads the rocker arm 10 . In an advantageous combination of functions, a single bearing cover 15 thus performs several functions.

Fig. 3, d. h. die Teilansicht X aus Fig. 1 zeigt, daß für jeden Zylinder 17a, 17b des Zylinderkopfes 1 zwei Einlaß-Hubventile 4 vorgesehen sind. Diesen beiden Hub­ ventilen 4 ist ein gemeinsamer nicht gezeigter Stößel, der beispielsweise einen rechteckigen Grundriß besitzen kann, zugeordnet. Betätigt wird dieser gemeinsame Stößel für die zwei Hubventile 4 je Zylinder von einem einzigen Schwinghebel 10. Dieser Schwinghebel 10 wirkt dabei auf die einzige Rolle 9a des Stößels ein. Zur Exzenterwelle 12 hin ist der Schwinghebel 10 gegabelt ausgebildet, d. h. er besitzt zwei Arme 10d und 10e, die sich jeweils an einem Exzenter 12a der Exzenterwelle 12 abstützen. Zwi­ schen den beiden Armen 10d, 10e ist die Schwinghebelrolle 10a angebracht. Durch diese Anordnung ist eine optimale Führung des Schwinghebels 10 trotz des ihm aufgeprägten komplexen Bewegungsablaufes gewährleistet. Analog zur Ge­ staltung des Lagerdeckels 15 ist auch dabei eine äußerst günstige Konstruktion geschaffen, die sich durch geringen Bauraumbedarf sowie eine einfache Fertigungsmöglichkeit auszeichnet. Selbstverständlich sind jedoch Abweichungen vom gezeigten Ausführungsbeispiel möglich, die weiterhin unter den Inhalt der Patentansprüche fallen. Fig. 3, ie the partial view X from Fig. 1 shows that two inlet lift valves 4 are provided for each cylinder 17 a, 17 b of the cylinder head 1 . These two stroke valves 4 is associated with a common plunger, not shown, which may have a rectangular outline, for example. This common tappet for the two lift valves 4 per cylinder is actuated by a single rocker arm 10 . This rocker arm 10 acts on the single roller 9 a of the plunger. To the eccentric shaft 12 , the rocker arm 10 is forked, ie it has two arms 10 d and 10 e, each of which is supported on an eccentric 12 a of the eccentric shaft 12 . Between the two arms 10 d, 10 e, the rocker arm roller 10 a is attached. This arrangement ensures optimal guidance of the rocking lever 10 despite the complex movement sequence impressed on it. Analogous to the design of the bearing cover 15 , an extremely favorable construction is also created, which is characterized by a small space requirement and a simple manufacturing possibility. Of course, however, deviations from the exemplary embodiment shown are possible and continue to fall within the scope of the claims.

Claims (5)

1. Zylinderkopf einer Brennkraftmaschine mit einem durch einen Lagerdeckel (15) geschlossenen Lager für eine Nockenwelle (7), deren Nocken (7a) auf Hubventile (4) einwirkende Schwinghebel (10) betä­ tigen, die sich an Exzentern (12a) abstützen, die auf einer Exzenterwelle (12) angeordnet sind, wobei durch Verdrehen dieser Exzenterwelle (12) der von den Nocken (7a) hervorgerufene Ventilhubverlauf verän­ derbar ist, dadurch gekennzeichnet, daß der Lagerdeckel (15) ebenfalls ein im Zylinderkopf (1) vorgesehenes La­ ger für die Exzenterwelle (12) vervollständigt.1. Cylinder head of an internal combustion engine with a closed by a bearing cover ( 15 ) bearing for a camshaft ( 7 ), the cams ( 7 a) acting on globe valves ( 4 ) acting rocker arm ( 10 ), which are supported on eccentrics ( 12 a) , which are arranged on an eccentric shaft ( 12 ), wherein by turning this eccentric shaft ( 12 ) the cam stroke caused by the cams ( 7 a) can be changed, characterized in that the bearing cover ( 15 ) is also provided in the cylinder head ( 1 ) Storage for the eccentric shaft ( 12 ) completed. 2. Zylinderkopf nach Anspruch 1, dadurch gekennzeichnet, daß der Lagerdeckel (15) den Schwinghebel (10) führt.2. Cylinder head according to claim 1, characterized in that the bearing cover ( 15 ) guides the rocker arm ( 10 ). 3. Zylinderkopf nach Anspruch 2, dadurch gekennzeichnet, daß der Lagerdeckel (15) einen Bolzen (11) trägt, auf dem der Schwinghebel (10) über einem Langloch (10b) aufgehängt ist. 3. Cylinder head according to claim 2, characterized in that the bearing cover ( 15 ) carries a bolt ( 11 ) on which the rocker arm ( 10 ) is suspended via an elongated hole ( 10 b). 4. Zylinderkopf nach einem der Ansprüche 1 bis 3 mit zumindest zwei parallel wirkenden Hubventilen (4), dadurch gekennzeichnet, daß der einen gemeinsamen Stößel (Stößelrolle 9a) betätigende Schwinghebel (10) gegabelt ausgebildet ist, um sich an zumindest zwei gleichen Exzentern (12a) abzustützen.4. Cylinder head according to one of claims 1 to 3 with at least two parallel-acting lift valves ( 4 ), characterized in that the one common tappet (tappet roller 9 a) actuating rocker arm ( 10 ) is forked in order to at least two identical eccentrics ( 12 a) support. 5. Zylinderkopf nach Anspruch 4, dadurch gekennzeichnet, daß zwischen den gegabelten Armen (10d, 10e) des Schwinghebels (10) eine Rolle (10a) gelagert ist, auf der der zugehörige Nocken (7a) ab­ wälzt.5. Cylinder head according to claim 4, characterized in that between the forked arms ( 10 d, 10 e) of the rocker arm ( 10 ) a roller ( 10 a) is mounted on which the associated cam ( 7 a) rolls.
DE4223172A 1992-07-15 1992-07-15 Cylinder head for IC engine - bearing cover for cam shaft bearing also acts for bearing for eccentric shaft Expired - Lifetime DE4223172C1 (en)

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DE19537377A1 (en) * 1995-10-06 1997-04-10 Bayerische Motoren Werke Ag Device for changing the stroke of internal combustion engine valves
DE19614825A1 (en) * 1996-04-15 1997-04-30 Audi Ag Cylinder head for multicylinder internal combustion engine
DE19629881A1 (en) * 1996-07-24 1998-01-29 Bayerische Motoren Werke Ag Valve train of an internal combustion engine with rocker arms supported on an eccentric shaft
EP1039103A2 (en) 1999-03-26 2000-09-27 Bayerische Motoren Werke Aktiengesellschaft Device for modifying the valve lift in an engine cylinder head
EP1143118A2 (en) 2000-04-07 2001-10-10 Bayerische Motoren Werke Aktiengesellschaft Device for varying the valve lift in an engine cylinder head
EP1180587A2 (en) 2000-08-19 2002-02-20 Bayerische Motoren Werke Aktiengesellschaft Externally ignited direct injecting reciprocating piston internal combustion engine with homogeneous mixture formation
DE10143026A1 (en) * 2001-09-01 2003-03-20 Bayerische Motoren Werke Ag Method for mixture formation in a direct-injection, spark-ignition internal combustion engine
WO2003058039A1 (en) 2001-12-29 2003-07-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device for variably actuating the gas exchange valves in reciprocating engines
WO2003078806A1 (en) 2002-03-18 2003-09-25 Ina-Schaeffler Kg Device for controlling the cylinder charge of an externally ignited internal combustion engine
WO2004088094A3 (en) * 2003-03-29 2005-03-03 Hydraulik Ring Gmbh Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
DE10341702A1 (en) * 2003-09-10 2005-04-28 Bayerische Motoren Werke Ag Valve drive mechanism for a lifting-piston internal combustion engine has a cam device to activate a gas shuttle valve in accordance with the cam device
US6907852B2 (en) 2001-05-12 2005-06-21 Bayerische Motoren Werke Ag Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine
DE10354428A1 (en) * 2003-11-21 2005-06-23 Bayerische Motoren Werke Ag Management system for IC engine especially during cold starting has the opening time of the inlet valve reduced and with retarded timing
US7044094B2 (en) 2002-12-27 2006-05-16 Gerlinde Bosl-Flierl Valve-lift device for the variable control of gas-exchange valves of an internal combustion engine
DE19708484B4 (en) * 1997-03-03 2006-07-13 Bayerische Motoren Werke Ag Device for changing the Ventilhubverlaufes a lift valve, in particular a gas exchange valve of internal combustion engines
EP1710403A1 (en) * 2004-01-30 2006-10-11 HONDA MOTOR CO., Ltd. Engine
EP1726792A2 (en) 2005-05-26 2006-11-29 Yamaha Hatsudoki Kabushiki Kaisha Valve drive mechanism for engine
EP1760278A2 (en) * 2005-08-30 2007-03-07 Bayerische Motoren Werke Aktiengesellschaft Lift-variable valve-operating system for internal combustion engine
DE102005047040A1 (en) * 2005-09-30 2007-04-05 Mtu Friedrichshafen Gmbh Variable valve controller for V-engine, has lower oscillating arms adjusted around central cam shaft by displacement of guide shafts using actuator that is driven around regulating shaft, where arms are movably coupled with inlet valve
FR2899276A1 (en) * 2006-03-28 2007-10-05 Renault Sas Intake and exhaust valves` variable lifting control device for e.g. petrol engine, has cam follower comprising support zones with clearance compensating device for compensating clearance induced by displacement of axle
DE102006060884A1 (en) * 2006-12-22 2008-06-26 Volkswagen Ag Control of motor cylinder electrically-operated valves takes the running as a curve, divided into segments, for the setting to be related to motor working/driving conditions
DE10314683B4 (en) * 2003-03-29 2009-05-07 Entec Consulting Gmbh Variable valve lift control for a combustion engine with a bottom camshaft
DE10140635B4 (en) * 2001-08-13 2010-12-02 Entec Consulting Gmbh Device for variable valve lift adjustment of gas exchange valves of an internal combustion engine
CN102061952A (en) * 2010-10-08 2011-05-18 奇瑞汽车股份有限公司 Camshaft bearing seat
DE10230935B4 (en) * 2002-07-09 2014-01-09 Bayerische Motoren Werke Aktiengesellschaft Operating method for an internal combustion engine with a variable-stroke valve train
DE202014104157U1 (en) 2014-09-03 2014-09-15 Ford Global Technologies, Llc Valve lift control device with cylinder deactivation
DE102014217532A1 (en) 2014-09-03 2016-03-03 Ford Global Technologies, Llc Valve lift control device with cylinder deactivation
DE102014217531A1 (en) 2014-09-03 2016-03-17 Ford Global Technologies, Llc Valve lift control device with cylinder deactivation
DE102014013664A1 (en) 2014-09-16 2016-03-17 Promescon Gmbh Valve drive device for the independent fully variable opening time adjustment of the gas exchange valves of an internal combustion engine
CN102364065B (en) * 2003-03-29 2016-12-14 液压环有限公司 The device and method regulated for the lift range variable of the ventilation door of internal combustion engine
DE102008047124B4 (en) * 2008-04-14 2019-03-21 Hyundai Motor Co. Infinitely variable valve lift

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DE19537377A1 (en) * 1995-10-06 1997-04-10 Bayerische Motoren Werke Ag Device for changing the stroke of internal combustion engine valves
DE19614825A1 (en) * 1996-04-15 1997-04-30 Audi Ag Cylinder head for multicylinder internal combustion engine
DE19629881A1 (en) * 1996-07-24 1998-01-29 Bayerische Motoren Werke Ag Valve train of an internal combustion engine with rocker arms supported on an eccentric shaft
DE19708484B4 (en) * 1997-03-03 2006-07-13 Bayerische Motoren Werke Ag Device for changing the Ventilhubverlaufes a lift valve, in particular a gas exchange valve of internal combustion engines
EP1039103A2 (en) 1999-03-26 2000-09-27 Bayerische Motoren Werke Aktiengesellschaft Device for modifying the valve lift in an engine cylinder head
EP1143118A2 (en) 2000-04-07 2001-10-10 Bayerische Motoren Werke Aktiengesellschaft Device for varying the valve lift in an engine cylinder head
EP1180587A2 (en) 2000-08-19 2002-02-20 Bayerische Motoren Werke Aktiengesellschaft Externally ignited direct injecting reciprocating piston internal combustion engine with homogeneous mixture formation
EP1180587A3 (en) * 2000-08-19 2003-03-19 Bayerische Motoren Werke Aktiengesellschaft Externally ignited direct injecting reciprocating piston internal combustion engine with homogeneous mixture formation
US6907852B2 (en) 2001-05-12 2005-06-21 Bayerische Motoren Werke Ag Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine
DE10140635B4 (en) * 2001-08-13 2010-12-02 Entec Consulting Gmbh Device for variable valve lift adjustment of gas exchange valves of an internal combustion engine
DE10143026A1 (en) * 2001-09-01 2003-03-20 Bayerische Motoren Werke Ag Method for mixture formation in a direct-injection, spark-ignition internal combustion engine
WO2003058039A1 (en) 2001-12-29 2003-07-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device for variably actuating the gas exchange valves in reciprocating engines
WO2003078806A1 (en) 2002-03-18 2003-09-25 Ina-Schaeffler Kg Device for controlling the cylinder charge of an externally ignited internal combustion engine
DE10230935B4 (en) * 2002-07-09 2014-01-09 Bayerische Motoren Werke Aktiengesellschaft Operating method for an internal combustion engine with a variable-stroke valve train
DE10261304B4 (en) * 2002-12-27 2009-01-22 BÖSL-FLIERL, Gerlinde Valve lift device for variable valve control of the gas exchange valves of an internal combustion engine
US7044094B2 (en) 2002-12-27 2006-05-16 Gerlinde Bosl-Flierl Valve-lift device for the variable control of gas-exchange valves of an internal combustion engine
EP1947301A3 (en) * 2003-03-29 2010-03-17 Hydraulik-Ring Gmbh Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
US7895981B2 (en) 2003-03-29 2011-03-01 Entec Consulting Gmbh Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
DE10314683B4 (en) * 2003-03-29 2009-05-07 Entec Consulting Gmbh Variable valve lift control for a combustion engine with a bottom camshaft
CN102364065B (en) * 2003-03-29 2016-12-14 液压环有限公司 The device and method regulated for the lift range variable of the ventilation door of internal combustion engine
WO2004088094A3 (en) * 2003-03-29 2005-03-03 Hydraulik Ring Gmbh Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
CN102364065A (en) * 2003-03-29 2012-02-29 液压环有限公司 Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
JP4669471B2 (en) * 2003-03-29 2011-04-13 ヒュドラオリク−リング・ゲーエムベーハー Variable valve lift device for lift adjustment of gas exchange valve of internal combustion engine
JP2006521495A (en) * 2003-03-29 2006-09-21 ヒュドラオリク−リング・ゲーエムベーハー Variable valve lift device for lift adjustment of gas exchange valve of internal combustion engine
DE10341702A1 (en) * 2003-09-10 2005-04-28 Bayerische Motoren Werke Ag Valve drive mechanism for a lifting-piston internal combustion engine has a cam device to activate a gas shuttle valve in accordance with the cam device
DE10354428A1 (en) * 2003-11-21 2005-06-23 Bayerische Motoren Werke Ag Management system for IC engine especially during cold starting has the opening time of the inlet valve reduced and with retarded timing
EP1710403A4 (en) * 2004-01-30 2008-12-17 Honda Motor Co Ltd Engine
US7523727B2 (en) 2004-01-30 2009-04-28 Honda Motor Co., Ltd. Engine
EP1710403A1 (en) * 2004-01-30 2006-10-11 HONDA MOTOR CO., Ltd. Engine
US7503297B2 (en) 2005-05-26 2009-03-17 Yamaha Hatsudoki Kaisha Valve drive mechanism for engine
EP1726792A2 (en) 2005-05-26 2006-11-29 Yamaha Hatsudoki Kabushiki Kaisha Valve drive mechanism for engine
EP1760278A3 (en) * 2005-08-30 2010-03-10 Bayerische Motoren Werke Aktiengesellschaft Lift-variable valve-operating system for internal combustion engine
DE102005040959A1 (en) * 2005-08-30 2007-03-08 Bayerische Motoren Werke Ag Hubvariabler valve drive for an internal combustion engine
EP1760278A2 (en) * 2005-08-30 2007-03-07 Bayerische Motoren Werke Aktiengesellschaft Lift-variable valve-operating system for internal combustion engine
DE102005047040A1 (en) * 2005-09-30 2007-04-05 Mtu Friedrichshafen Gmbh Variable valve controller for V-engine, has lower oscillating arms adjusted around central cam shaft by displacement of guide shafts using actuator that is driven around regulating shaft, where arms are movably coupled with inlet valve
FR2899276A1 (en) * 2006-03-28 2007-10-05 Renault Sas Intake and exhaust valves` variable lifting control device for e.g. petrol engine, has cam follower comprising support zones with clearance compensating device for compensating clearance induced by displacement of axle
DE102006060884A1 (en) * 2006-12-22 2008-06-26 Volkswagen Ag Control of motor cylinder electrically-operated valves takes the running as a curve, divided into segments, for the setting to be related to motor working/driving conditions
DE102008047124B4 (en) * 2008-04-14 2019-03-21 Hyundai Motor Co. Infinitely variable valve lift
CN102061952A (en) * 2010-10-08 2011-05-18 奇瑞汽车股份有限公司 Camshaft bearing seat
DE202014104157U1 (en) 2014-09-03 2014-09-15 Ford Global Technologies, Llc Valve lift control device with cylinder deactivation
DE102014217532A1 (en) 2014-09-03 2016-03-03 Ford Global Technologies, Llc Valve lift control device with cylinder deactivation
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