EP0287554A2 - Valve drive for an internal-combustion engine - Google Patents

Valve drive for an internal-combustion engine Download PDF

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Publication number
EP0287554A2
EP0287554A2 EP88890091A EP88890091A EP0287554A2 EP 0287554 A2 EP0287554 A2 EP 0287554A2 EP 88890091 A EP88890091 A EP 88890091A EP 88890091 A EP88890091 A EP 88890091A EP 0287554 A2 EP0287554 A2 EP 0287554A2
Authority
EP
European Patent Office
Prior art keywords
cylinder head
rocker arm
bearing surface
head upper
drive according
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.)
Withdrawn
Application number
EP88890091A
Other languages
German (de)
French (fr)
Other versions
EP0287554A3 (en
Inventor
Gerhard Feichtinger
Othmar Dipl.-Ing. Skatsche
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH
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 AVL List GmbH, AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH filed Critical AVL List GmbH
Publication of EP0287554A2 publication Critical patent/EP0287554A2/en
Publication of EP0287554A3 publication Critical patent/EP0287554A3/en
Withdrawn legal-status Critical Current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
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L2001/188—Fulcrums at upper surface

Definitions

  • the invention relates to a valve drive of an internal combustion engine with a camshaft below and at least one rocker arm mounted in the cylinder head, the web of which has a shape with a cylindrical bearing surface which is guided laterally.
  • a valve train of the type mentioned is known for example from DE-OS 24 36 091.
  • a bumper driven by a cam of the camshaft cooperates with its upper end with a rocker arm which is pivotally supported in the cylinder head cover. The other end of the rocker arm is in contact with the valve stem of a poppet valve.
  • the disadvantage of this design is that there is a relatively large friction surface between the cylinder head cover and the rocker arm.
  • a cylinder head cover according to the aforementioned DE-OS is only able to assume management and storage functions to a limited extent due to the large forces occurring in this area.
  • the aim of the invention is to avoid these problems and to propose a drive of the type mentioned at the outset, which is distinguished by a simple construction and in which the endurance can be found with a minimum of rework and individual parts.
  • the bearing surface for the U-shaped rocker arm is designed as a semi-cylindrical saddle and is an integral part of a cylinder head upper part which can be fastened to the cylinder head, and in that the leg of the rocker arm is guided laterally by guide surfaces of the cylinder head upper part.
  • the cylinder head upper part in the region of the valve stem can have a maintenance opening that can be closed with a cover. This makes it possible to adjust the valve using the adjusting screw without removing the upper part of the cylinder head mentioned.
  • the cylinder head upper part together with the saddle can be produced by die casting.
  • the upper part of the cylinder head can be produced in one operation, which also has the advantage that no machining is required.
  • a lubricating oil channel guided in the upper part of the cylinder head ends on the bearing surface of the saddle.
  • the rocker arm can be produced as a stamped sheet metal part or as an investment casting, which means that in both cases no machining of the bearing point is required.
  • the rocker arm 2 which is supported on a push rod 1 and the valve stem 4, has a U-shaped cross section, the web 10 of the rocker arm 2 having a shape 11 serving as a bearing surface.
  • the rocker arm 2 is pivotally supported on the saddle 12 formed in one piece with the cylinder head upper part 3, the bearing surface of which is semi-cylindrical and essentially opposite to the bearing surface of the rocker arm 2 on the shape 11.
  • a maintenance opening 16 is provided in the cylinder head upper part 3, which is covered with the maintenance cover 9. This allows access to the adjusting screw 8.
  • Such a maintenance cover or the maintenance opening can possibly be dispensed with if the valve train is provided with hydraulic valve clearance compensation elements.
  • a lubrication channel 7 opens at the bearing surface of the saddle 12.
  • these lubrication channels are supplied in pairs by a supply channel 17 which is connected to a pressure oil source (not shown) and in the upper part of the cylinder head 3 runs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

Valve drive for an internal-combustion engine, having a bottom-mounted camshaft and at least one rocker arm supported in the cylinder head whose web has a deformation with a cylindrical bearing surface which is guided laterally. According to the invention, it is provided that the bearing surface for the rocker arm (2), designed as a U-shape, is designed as a half-cylindrical saddle (12) and is an integrated component of a cylinder head upper part (3), which can be mounted on the cylinder head, and that the limb (13) of the rocker arm (2) is guided laterally by guide surfaces (14) on the cylinder head upper part (3). As a result, with a simple design, a drive is produced in which the requirement is met with a minimum of reworking and individual parts. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Ventilantrieb einer Brennkraftmaschine mit untenliegender Nockenwelle und mindes­tens einem im Zylinderkopf gelagerten Kipphebel, dessen Steg eine Ausformung mit einer zylindrischen Lagerfläche aufweist, welche seitlich geführt ist.The invention relates to a valve drive of an internal combustion engine with a camshaft below and at least one rocker arm mounted in the cylinder head, the web of which has a shape with a cylindrical bearing surface which is guided laterally.

Ein Ventiltrieb der eingangs genannten Art ist beispielsweise aus der DE-OS 24 36 091 bekannt. Eine von einem Nocken der Nockenwelle angetriebene Stoßstange arbeitet mit ihrem oberen Ende mit einem Kipphebel zusammen, welcher schwenkbar im Zy­linderkopfdeckel abgestützt ist. Das andere Ende des Kipphe­bels steht in Kontakt mit dem Ventilschaft eines Tellerven­tils. Nachteiligerweise kommt es bei dieser Konstruktion zu einer relativ großen Reibfläche zwischen Zylinderkopfdeckel und Kipphebel. Überdies ist ein Zylinderkopfdeckel nach der genannten DE-OS aufgrund der in diesem Bereich auftretenden großen Kräfte nur bedingt in der Lage Führungs- und Lagerfunk­tionen zu übernehmen.A valve train of the type mentioned is known for example from DE-OS 24 36 091. A bumper driven by a cam of the camshaft cooperates with its upper end with a rocker arm which is pivotally supported in the cylinder head cover. The other end of the rocker arm is in contact with the valve stem of a poppet valve. The disadvantage of this design is that there is a relatively large friction surface between the cylinder head cover and the rocker arm. In addition, a cylinder head cover according to the aforementioned DE-OS is only able to assume management and storage functions to a limited extent due to the large forces occurring in this area.

Ein weiterer Ventilantrieb wurde z.B. durch die EU-A2 64 836 bekannt. Bei dieser Lösung sind die Kipphebel an zylindri­schen Auflagern abgestützt, die mittels die Stege der Kipphe­bel durchsetzender Schrauben am Zylinderkopf befestigt sind. Dabei ergibt sich allerdings aufgrund der Durchführung der Schrauben durch die Stege der Kipphebel eine erhebliche Ver­kleinerung der Lagerfläche, die zu einer entsprechend erhöh­ten spezifischen Flächenbelastung führt.Another valve actuator was e.g. known by the EU-A2 64 836. In this solution, the rocker arms are supported on cylindrical supports which are fastened to the cylinder head by means of screws passing through the webs of the rocker arms. However, due to the passage of the screws through the webs of the rocker arms, the bearing surface is considerably reduced, which leads to a correspondingly increased specific surface load.

Bei anderen Konstruktionen solcher Antriebe wurden auch schon Kipphebel vorgeschlagen, die auf einer am Zylinderkopf gehal­tenen Achse abgestützt sind, wobei sich aber der Nachteil ei­nes sehr großen konstruktiven Aufwandes ergibt. Durch die EU-B1 74 875 ist auch schon eine Konstruktion bekannt gewor­den, bei der die Kipphebel auf einer Achse gelagert sind, die ihrerseits am Zylinderkopf abgestützt ist.Other designs of such drives have also been used Rocker arm proposed that are supported on an axis held on the cylinder head, but there is the disadvantage of a very large design effort. The EU-B1 74 875 has already made known a construction in which the rocker arms are mounted on an axle which in turn is supported on the cylinder head.

Ziel der Erfindung ist es, diese Nachtiele zu vermeiden und einen Antrieb der eingangs erwähnten Art vorzuschlagen, der sich durch eine einfache Konstruktion auszeichnet und bei dem mit einem Minimum an Nacharbeit und Einzelteilen das Auslan­gen gefunden werden kann.The aim of the invention is to avoid these problems and to propose a drive of the type mentioned at the outset, which is distinguished by a simple construction and in which the endurance can be found with a minimum of rework and individual parts.

Erfindungsgemäß wird dies dadurch erreicht, daß die Lagerflä­che für den U-förmig ausgebildeten Kipphebel als halbzylin­drischer Sattel ausgebildet und ein integrierter Bestandteil eines am Zylinderkopf befestigbaren Zylinderkopfoberteils ist, sowie daß der Schenkel des Kipphebels seitlich von Füh­rungsflächen des Zylinderkopfoberteils geführt ist.According to the invention this is achieved in that the bearing surface for the U-shaped rocker arm is designed as a semi-cylindrical saddle and is an integral part of a cylinder head upper part which can be fastened to the cylinder head, and in that the leg of the rocker arm is guided laterally by guide surfaces of the cylinder head upper part.

Alle Lager- und Führungsfunktionen werden demnach von einem stabilen Zylinderkopfoberteil übernommen, welcher als Lager­fläche einen halbzylindrischen Sattel geringer Reibfläche aufweist. Durch diese Maßnahmen wird bei einfacher Herstell­barkeit zusätzlich sichergestellt, daß die Führung des Kipp­hebels praktisch keine zusätzliche Bauhöhe erfordert und für die Abstützung des Kipphebels eine Fläche vorgesehen werden kann, welche keine Durchführungen für Befestigungsschrauben aufweist, wie sie z.B. gemäß der EU-A2 64 836 notwendig sind. Außerdem sind für die Führung der Kipphebel keine weiteren Bauteile außer dem Zylinderkopfoberteil erforderlich.All storage and management functions are therefore taken over by a stable cylinder head upper part, which has a semi-cylindrical saddle with a small friction surface as the bearing surface. These measures additionally ensure, with simple manufacturability, that guiding the rocker arm requires practically no additional overall height and that a surface can be provided for supporting the rocker arm that has no bushings for fastening screws, such as those e.g. according to EU-A2 64 836 are necessary. In addition, no components other than the cylinder head upper part are required for guiding the rocker arms.

In einer Weiterbildung der Erfindung kann der Zylinderkopf­oberteil im Bereich des Ventilschaftes eine mit einem Deckel verschließbare Wartungsöffnung aufweisen. Dadurch ist eine Einstellung des Ventils über die Einstellschraube möglich ohne den genannten Zylinderkopfoberteil zu entfernen.In a development of the invention, the cylinder head upper part in the region of the valve stem can have a maintenance opening that can be closed with a cover. This makes it possible to adjust the valve using the adjusting screw without removing the upper part of the cylinder head mentioned.

Nach einem weiteren Merkmal der Erfindung kann der Zylinder­kopfoberteil samt Sattel durch Druckgießen hergestellt sein.According to a further feature of the invention, the cylinder head upper part together with the saddle can be produced by die casting.

Dabei kann der Zylinderkopfoberteil in einem Arbeitsgang hergestellt werden, wobei sich überdies der Vorteil ergibt, daß keine spanabhebende Bearbeitung erforderlich ist.The upper part of the cylinder head can be produced in one operation, which also has the advantage that no machining is required.

Zur Erzielung einer guten Schmierung kann vorgesehen sein, daß an der Lagerfläche des Sattels ein im Zylinderkopfober­teil geführter Schmierölkanal endet.In order to achieve good lubrication, it can be provided that a lubricating oil channel guided in the upper part of the cylinder head ends on the bearing surface of the saddle.

In weiterer Ausgestaltung der Erfindung kann der Kipphebel als Blechprägeteil oder als Feingußteil hergestellt werden, wodurch in beiden Fällen ebenfalls keine spanabhebende Bear­beitung der Lagerstelle erforderlich ist.In a further embodiment of the invention, the rocker arm can be produced as a stamped sheet metal part or as an investment casting, which means that in both cases no machining of the bearing point is required.

Die Erfindung wird nun anhand der Zeichnungen näher erläu­tert. Dabei zeigen:

  • Figur 1 einen Schnitt durch einen erfindungsgemäßen Ventil­antrieb entlang der Linie I-I in Figur 3,
  • Figur 2 einen Schnitt entlang der Linie II-II in der Figur 1,
  • Figur 3 einen Schnitt entlang der Linie III-III in Figur 2 und
  • Figur 4 einen Schnitt entlang der Linie IV-IV in der Figur 3.
The invention will now be explained in more detail with reference to the drawings. Show:
  • 1 shows a section through a valve drive according to the invention along the line II in FIG. 3,
  • FIG. 2 shows a section along the line II-II in FIG. 1,
  • 3 shows a section along the line III-III in Figure 2 and
  • FIG. 4 shows a section along the line IV-IV in FIG. 3.

Wie insbesondere aus den Figuren 1 und 2 ersichtlich ist, weist der Kipphebel 2, der sich auf eine Stößelstange 1 und den Ventilschaft 4 abstützt, einen U-förmigen Querschnitt auf, wobei der Steg 10 des Kipphebels 2 eine als Lagerfläche die­nende Ausformung 11 aufweist.As can be seen in particular from FIGS. 1 and 2, the rocker arm 2, which is supported on a push rod 1 and the valve stem 4, has a U-shaped cross section, the web 10 of the rocker arm 2 having a shape 11 serving as a bearing surface.

Mit dieser Ausformung 11 stützt sich der Kipphebel 2 schwenk­bar an dem mit dem Zylinderkopfoberteil 3 einstückig ausge­bildeten Sattel 12 ab, dessen Lagerfläche halbzylindrisch und im wesentlichen gegengleich zur Lagerfläche des Kipphebels 2 an der Ausformung 11 ausgebildet ist.With this shape 11, the rocker arm 2 is pivotally supported on the saddle 12 formed in one piece with the cylinder head upper part 3, the bearing surface of which is semi-cylindrical and essentially opposite to the bearing surface of the rocker arm 2 on the shape 11.

Da die Schenkel 13 durch die Führungsflächen 14 im vorzugs­weise als Druckgußstück ausgebildeten Zylinderkopfoberteil 3 geführt sind, ist der Kipphebel 2 lediglich im Zylinderkopf­oberteil 3 gehalten, der auf dem Zylinderkopf 15 mittels der Schrauben 5 und 6 befestigbar ist. Diese Konstruktion eignet sich hervorragend zur Aufnahme der in diesem Bereich auftre­tenden Lager- und Führungskräfte.Since the legs 13 through the guide surfaces 14 in the cylinder head upper part 3, which is preferably designed as a pressure casting are guided, the rocker arm 2 is only held in the cylinder head upper part 3, which can be fastened on the cylinder head 15 by means of the screws 5 and 6. This construction is ideally suited for accommodating the warehouse and management personnel that occur in this area.

Um eine Einstellung des Ventils zu ermöglichen, ist in dem Zylinderkopfoberteil 3 eine Wartungsöffnung 16 vorgesehen, die mit dem Wartungsdeckel 9 abgedeckt ist. Dadurch ist ein Zugang zur Einstellschraube 8 möglich. Auf einen solchen War­tungsdeckel, bzw. die Wartungsöffnung kann eventuell verzich­tet werden, wenn der Ventiltrieb mit hydraulischen Ventil­spielausgleichselementen versehen ist.In order to enable an adjustment of the valve, a maintenance opening 16 is provided in the cylinder head upper part 3, which is covered with the maintenance cover 9. This allows access to the adjusting screw 8. Such a maintenance cover or the maintenance opening can possibly be dispensed with if the valve train is provided with hydraulic valve clearance compensation elements.

Wie aus der Figur 1 ersichtlich ist, mündet an der Lagerflä­che des Sattels 12 ein Schmierkanal 7. Diese Schmierkanäle werden, wie aus der Figur 3 ersichtlich ist, paarweise von einem Zuführkanal 17 versorgt, der mit einer nicht darge­stellten Druckölquelle in Verbindung steht und im Zylinder­kopfoberteil 3 verläuft.As can be seen from FIG. 1, a lubrication channel 7 opens at the bearing surface of the saddle 12. As can be seen from FIG. 3, these lubrication channels are supplied in pairs by a supply channel 17 which is connected to a pressure oil source (not shown) and in the upper part of the cylinder head 3 runs.

Claims (6)

1. Ventilantrieb einer Brennkraftmaschine mit untenliegender Nockenwelle und mindestens einem im Zylinderkopf gelager­ten Kipphebel, dessen Steg eine Ausformung mit einer zy­lindrischen Lagerfläche aufweist, welche seitlich geführt ist, dadurch gekennzeichnet, daß die Lagerfläche für den U-förmig ausgebildeten Kipphebel (2) als halbzylindrischer Sattel (12) ausgebildet und ein inte­grierter Bestandteil eines am Zylinderkopf befestigbaren Zylinderkopfoberteils (3) ist, sowie daß der Schenkel (13) des Kipphebels (2) seitlich von Führungsflächen (14) des Zylinderkopfoberteils (3) geführt ist.1. Valve drive of an internal combustion engine with a camshaft below and at least one rocker arm mounted in the cylinder head, the web of which has a shape with a cylindrical bearing surface, which is guided laterally, characterized in that the bearing surface for the U-shaped rocker arm (2) as a semi-cylindrical saddle (12) and is an integral part of a cylinder head upper part (3) which can be fastened to the cylinder head, and that the leg (13) of the rocker arm (2) is guided laterally by guide surfaces (14) of the cylinder head upper part (3). 2. Antrieb nach Anspruch 1, dadurch gekennzeichnet, daß der Zylinderkopfoberteil (3) im Bereich des Ventilschaftes (4) eine mit einem Deckel (9) verschließbare Wartungsöffnung (16) aufweist.2. Drive according to claim 1, characterized in that the cylinder head upper part (3) in the region of the valve stem (4) has a maintenance opening (16) which can be closed with a cover (9). 3. Antrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Zylinderkopfoberteil (3) samt Sattel (12) durch Druckgießen hergestellt ist.3. Drive according to claim 1 or 2, characterized in that the cylinder head upper part (3) together with the saddle (12) is made by die casting. 4. Antrieb nach einem der Ansprüche 1 bis 3, dadurch gekenn­zeichnet, daß an der Lagerfläche des Sattels (12) ein im Zylinderkopfoberteil (3) geführter Schmierölkanal (7) endet.4. Drive according to one of claims 1 to 3, characterized in that in the bearing surface of the saddle (12) ends in the cylinder head upper part (3) guided lubricating oil channel (7). 5. Antrieb nach einem der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß der Kipphebel (2) als Blechprägeteil herge­stellt ist.5. Drive according to one of claims 1 to 4, characterized in that the rocker arm (2) is made as a stamped sheet metal part. 6. Antrieb nach einem der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß der Kipphebel (2) als Feingußteil herge­stellt ist.6. Drive according to one of claims 1 to 4, characterized in that the rocker arm (2) is made as an investment casting.
EP88890091A 1987-04-13 1988-04-12 Valve drive for an internal-combustion engine Withdrawn EP0287554A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT927/87 1987-04-13
AT92787 1987-04-13

Publications (2)

Publication Number Publication Date
EP0287554A2 true EP0287554A2 (en) 1988-10-19
EP0287554A3 EP0287554A3 (en) 1989-03-15

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Family Applications (1)

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EP88890091A Withdrawn EP0287554A3 (en) 1987-04-13 1988-04-12 Valve drive for an internal-combustion engine

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0872630A2 (en) 1997-04-18 1998-10-21 Volkswagen Aktiengesellschaft Bearing for a finger arm of a valve operating device of an internal combustion engine
DE19743488A1 (en) * 1997-10-01 1999-04-08 Bayerische Motoren Werke Ag Cylinder head with valve control for an internal combustion engine
EP1186751A1 (en) * 2000-09-06 2002-03-13 EATON AUTOMOTIVE S.p.A. Valve lift control unit with simplified lubrication
DE102011114588A1 (en) * 2011-09-30 2013-04-04 Thyssenkrupp Presta Teccenter Ag Valve train for internal combustion engines with adjustable camshaft

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1355441A (en) * 1917-05-25 1920-10-12 Benjamin S Williams Internal-combustion engine
US2572968A (en) * 1947-03-11 1951-10-30 Continental Aviat & Eng Corp Rocker arm construction
FR1341909A (en) * 1962-12-20 1963-11-02 Ford Motor Co Development of internal combustion engines
GB953022A (en) * 1960-12-15 1964-03-25 Ford Motor Co Valve gear for internal combustion engines
FR1420573A (en) * 1964-10-30 1965-12-10 Simca Automobiles Sa Holding device for rocker arms mounted on ball joints
GB1040395A (en) * 1963-07-24 1966-08-24 Thompson Ramo Wooldridge Inc Improvements in or relating to valve rocker arms

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1355441A (en) * 1917-05-25 1920-10-12 Benjamin S Williams Internal-combustion engine
US2572968A (en) * 1947-03-11 1951-10-30 Continental Aviat & Eng Corp Rocker arm construction
GB953022A (en) * 1960-12-15 1964-03-25 Ford Motor Co Valve gear for internal combustion engines
FR1341909A (en) * 1962-12-20 1963-11-02 Ford Motor Co Development of internal combustion engines
GB1040395A (en) * 1963-07-24 1966-08-24 Thompson Ramo Wooldridge Inc Improvements in or relating to valve rocker arms
FR1420573A (en) * 1964-10-30 1965-12-10 Simca Automobiles Sa Holding device for rocker arms mounted on ball joints

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0872630A2 (en) 1997-04-18 1998-10-21 Volkswagen Aktiengesellschaft Bearing for a finger arm of a valve operating device of an internal combustion engine
DE19743488A1 (en) * 1997-10-01 1999-04-08 Bayerische Motoren Werke Ag Cylinder head with valve control for an internal combustion engine
EP1186751A1 (en) * 2000-09-06 2002-03-13 EATON AUTOMOTIVE S.p.A. Valve lift control unit with simplified lubrication
DE102011114588A1 (en) * 2011-09-30 2013-04-04 Thyssenkrupp Presta Teccenter Ag Valve train for internal combustion engines with adjustable camshaft

Also Published As

Publication number Publication date
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