EP0274483A1 - Valve control for reciprocating piston internal combustion engine - Google Patents

Valve control for reciprocating piston internal combustion engine

Info

Publication number
EP0274483A1
EP0274483A1 EP87903246A EP87903246A EP0274483A1 EP 0274483 A1 EP0274483 A1 EP 0274483A1 EP 87903246 A EP87903246 A EP 87903246A EP 87903246 A EP87903246 A EP 87903246A EP 0274483 A1 EP0274483 A1 EP 0274483A1
Authority
EP
European Patent Office
Prior art keywords
valve
rocker arm
valve control
guide part
groove
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Withdrawn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
EP87903246A
Other languages
German (de)
French (fr)
Inventor
Herbert Deutschmann
Karl Schier
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.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
MTU Motoren und Turbinen Union Friedrichshafen 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 MTU Friedrichshafen GmbH, MTU Motoren und Turbinen Union Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of EP0274483A1 publication Critical patent/EP0274483A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01L1/26—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
    • F01L2307/00—Preventing the rotation of tappets
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to a valve control for a reciprocating piston internal combustion engine according to the preamble of claim 1. With this arrangement, actuation of the valves free of shear force is to be achieved.
  • Figure 1 cross section of a cylinder head in the region of a pair of valves.
  • FIG. 2 partial section along the line II-II in Fig. 1. ⁇
  • valve control for two valves 12, 13 is arranged, which are actuated together by a rocker arm 14.
  • rocker arm 14 is moved by a bumper 15.
  • the movement of the rocker arm 16 on the valve side is transmitted by a pressure piece 17 to a crossmember 18, which in turn interacts with the shaft ends of the valves 12, 13 via pressure pieces 19, 20.
  • the cross member 18 is guided parallel to the valve axes on a cylindrical bolt 21 fastened in the cylinder head 11.
  • the device for securing against rotation consists in the formation of a groove 22 at one end the traverse 18 outside the valve axes, which slidably engages over a guide part 23 arranged on the rocker arm 14.
  • the guide part 23 arranged in the area of the rocker arm hub which in the example consists of a molded rib, extends so far parallel to the valve axes in the direction of movement of the cross member 18 that an overlap between the groove 22 and the guide part 23 is ensured in all operating positions of the cross member 18.
  • the device for securing against rotation is at a greater distance from the guide axis of the crossmember 18 - the axis of the bolt 21 - than the pressure pieces 19, 20.
  • the possible swivel angle of the crossmember 18 resulting from the lateral play between the groove 22 and the guide part 23 results in the pressure pieces 19 , 20 a smaller lateral offset with respect to the valve axes than the dimension of the lateral play between groove 22 and guide part 23 corresponds.
  • the device for securing the cross member 18 against rotation can advantageously also be arranged such that it is effective between the cross member 18 and an adjacent housing wall 24.
  • a guide part 23 ' can be arranged on the corresponding housing wall 24 and the associated groove 22' at the other end of the crossmember 18, see dash-dotted representation in Fig. 1st

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Dans une commande de soupapes, des soupapes renversées agencées en paires sont actionnées ensemble par un culbuteur. Le mouvement du culbuteur est transmis à une traverse cylindrique parallèle à l'axe des soupapes et coopérant avec celles-ci. La rotation de la traverse autour de son axe de guidage bloque un dispositif composé d'une partie de guidage (23) agencée sur le culbuteur (14) et d'une rainure (22) formée à une extrémité de la traverse et quicoulisse sur la partie de guidage (23).In a valve drive, reverse valves arranged in pairs are actuated together by a rocker. The movement of the rocker arm is transmitted to a cylindrical cross member parallel to the axis of the valves and cooperating with them. The rotation of the cross member around its guide axis blocks a device composed of a guide part (23) arranged on the rocker arm (14) and a groove (22) formed at one end of the cross member and which slides on the guide part (23).

Description

Ventilsteuerung für eine Hubkolben-BrennkraftmaschineValve control for a reciprocating piston internal combustion engine
Die Erfindung bezieht sich auf eine Ventilsteuerung für eine Hubkolben-Brennkraftmaschine entsprechend dem Oberbegriff von Anspruch 1. Mit dieser Anordnung soll eine guerkraftfreie Betätigung der Ventile erreicht werden.The invention relates to a valve control for a reciprocating piston internal combustion engine according to the preamble of claim 1. With this arrangement, actuation of the valves free of shear force is to be achieved.
Bei einer gattungsbildenden Ventilsteuerung, die aus der DE-PS 12 98 103 bekannt ist, taucht der Kipphebel mit seinem ventilseitigen Arm in eine zentrisch zur Achse der zylindrischen Traversenführung liegenden Vertiefung auf der Oberseite der Traverse ein. Ein Verdrehen der Traverse soll offensichtlich dadurch verhindert werden, daß die Seitenwände der zentrischen Vertiefung an den Seitenflanken des Kipphebelarms geführt sind. Diese Seitenführung der Traverse ist auf einen sehr kurzen, mittig gelegenen Abschnitt ihrer Länge beschränkt. Daraus resultieren sehr kleine' Hebelarme für die Verdrehsicherung der Traverse. Die kurzen Hebelarme in Verbindung mit dem funktioneil erforderliehen Spiel zwischen den benachbarten Seitenwänden der Vertiefung und den Seitenflanken des Kipphebels ergeben einen untolerierbar großen Verschwenkwinkel der Traverse. Bei verschwenkter Traverse liegen aber die Druckpunkte zwischen Traverse und Ventil^chaft seitlich versetzt zu den Ventilachsen. Dadurch entstehen Querkräfte, die die Ventilführung in unerwünschter Weise zusätzlich belasten.In a generic valve control, which is known from DE-PS 12 98 103, the rocker arm dips with its valve-side arm into a recess on the top of the crossmember, which is centered on the axis of the cylindrical crossmember guide. A rotation of the traverse is obviously to be prevented by the fact that the side walls of the central recess are guided on the side flanks of the rocker arm. This side guide of the cross member is limited to a very short, centrally located section of its length. This results in very little 'lever arms for the rotation of the traverse. The short lever arms in connection with the functionally required play between the adjacent side walls of the depression and the side flanks of the rocker arm result in an intolerably large pivoting angle of the cross member. When the traverse is pivoted, the pressure points between the traverse and the valve stem are laterally offset from the valve axes. This creates transverse forces that additionally burden the valve guide in an undesirable manner.
Es ist deshalb Aufgabe der Erfindung, eine gattungsgemäße Ventilsteuerung zu schaffen, bei der sich trotz des funktioneil erforderlichen Spiels in der die Seitenführung der Traverse bewirkenden Vorrichtung eine Verdrehsicherung - • der Traverse mit tolerierbar kleinem Verschwenkwinkel ergibt.It is therefore an object of the invention to provide a generic valve control in which, despite the functionally required play in the device causing the lateral guidance of the crossbar, an anti-rotation device - the crossbar results with a tolerably small pivoting angle.
Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen von Anspruch 1 gelöst. Vorteilhafte Ausbildungen der Erfindung ergeben sich mit den Merkmalen der Ansprüche 2 bis 4. Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß sich ein großer Hebelarm für die Verdrehsicherung der Traverse ergibt, daß die Paßgenauigkeit zwischen Führungsteil und Nut gering sein kann, ohne daß sich ein untolerierbarer Verschwenkwinkel der Traverse ergibt und daß die Druckpunktverschiebung zwischen Traverse und Ventilschaft in engen Grenzen bleibt, so daß keine betriebsgefährdenden Beanspruchungen der Ventilführung auftreten.This object is achieved according to the invention with the characterizing features of claim 1. Advantageous embodiments of the invention result from the features of claims 2 to 4. The advantages achieved by the invention are in particular that there is a large lever arm for securing the cross member against rotation, that the fit between the guide part and the groove can be low without an intolerable pivoting angle of the cross member and that the pressure point shift between the cross member and valve stem remains within narrow limits, so that no stresses on the valve guide that could jeopardize operation occur.
Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden nachstehend näher beschrieben. Es zeigen:Two embodiments of the invention are shown in the drawing and are described in more detail below. Show it:
Fig. 1 Querschnitt eines Zylinderkopfes im Bereich eines Ventilpaares;Figure 1 cross section of a cylinder head in the region of a pair of valves.
Fig. 2 Teilschnitt nach der Linie II-II in Fig. 1. ϊFig. 2 partial section along the line II-II in Fig. 1. ϊ
In einem Zylinderkopf 11 einer nicht weiter dargestellten Hubkolben-Brennkraftmaschine ist die Ventilsteuerung für zwei Ventile 12, 13 angeordnet, die gemeinsam durch einen Kipphebel 14 betätigt werden. Der Kipphebel 14 wird ausgehend von einer nicht gezeigten Nockenwelle durch eine Stoßstange 15 bewegt. Die Bewegung des ventilseitigen Kipphebelarmes 16 wird durch ein Druckstück 17 auf eine Traverse 18 übertragen, die ihrerseits über Druckstücke 19, 20 mit den Schaftenden der Ventile 12, 13 zusammenwirkt. Die Traverse 18 wird parallel zu den Ventilachsen auf einem im Zylinderkopf 11 befestigten, zylindrischen Bolzen 21 geführt.In a cylinder head 11 of a reciprocating piston internal combustion engine, not shown, the valve control for two valves 12, 13 is arranged, which are actuated together by a rocker arm 14. Starting from a camshaft, not shown, the rocker arm 14 is moved by a bumper 15. The movement of the rocker arm 16 on the valve side is transmitted by a pressure piece 17 to a crossmember 18, which in turn interacts with the shaft ends of the valves 12, 13 via pressure pieces 19, 20. The cross member 18 is guided parallel to the valve axes on a cylindrical bolt 21 fastened in the cylinder head 11.
Damit die guerkraftfreie Betätigung der Ventile erreicht wird, muß dafür gesorgt sein, daß die Traverse 18 im Betrieb keine Schwenkbewegung um die Achse des Bolzens 21 ausführen kann. Im Beispiel nach Fig. 1 besteht die Vorrichtung für die Verdrehsicherung in der Ausbildung einer Nut 22 an einem Ende der Traverse 18 außerhalb der Ventilachsen, die ein am Kipphebel 14 angeordnetes Führungsteil 23 gleitbar übergreift.In order for the valves to be actuated without shear force, it must be ensured that the crossmember 18 cannot execute a pivoting movement about the axis of the bolt 21 during operation. In the example according to FIG. 1, the device for securing against rotation consists in the formation of a groove 22 at one end the traverse 18 outside the valve axes, which slidably engages over a guide part 23 arranged on the rocker arm 14.
Das im Bereich der Kipphebelnabe angeordnete Führungsteil 23, daß im Beispiel aus einer angeformten Rippe besteht, erstreckt sich so weit parallel zu den Ventilachsen in Bewegungsrichtung der Traverse 18, daß in allen Betriebsstellungen der Traverse 18 eine Überlappung zwischen Nut 22 und Führungsteil 23 gewährleistet ist.The guide part 23 arranged in the area of the rocker arm hub, which in the example consists of a molded rib, extends so far parallel to the valve axes in the direction of movement of the cross member 18 that an overlap between the groove 22 and the guide part 23 is ensured in all operating positions of the cross member 18.
Die Vorrichtung für die Verdrehsicherung besitzt einen größeren Abstand zur Führungsachse der Traverse 18 - der Achse des Bolzens 21 - als die Druckstücke 19, 20. Der aus dem seitlichen Spiel zwischen Nut 22 und Führungsteil 23 resultierende mögliche Schwenkwinkel der Traverse 18 ergibt an den Druckstücken 19, 20 einen geringeren seitlichen Versatz gegenüber den Ventilachsen, als dem Maß des seitlichen Spiels zwischen Nut 22 und Führungsteil 23 entspricht.The device for securing against rotation is at a greater distance from the guide axis of the crossmember 18 - the axis of the bolt 21 - than the pressure pieces 19, 20. The possible swivel angle of the crossmember 18 resulting from the lateral play between the groove 22 and the guide part 23 results in the pressure pieces 19 , 20 a smaller lateral offset with respect to the valve axes than the dimension of the lateral play between groove 22 and guide part 23 corresponds.
Vorteilhaft kann die Vorrichtung zur Verdrehsicherung der Traverse 18 auch so angeordnet werden, daß sie zwischen der Traverse 18 und einer benachbarten Gehäusewand 24 wirksam ist. Dabei kann z. B. ein Führungsteil 23' an der entsprechenden Gehäusewand 24 und die zugehörige Nut 22 ' am anderen Ende der Traverse 18 angeordnet sein, siehe strichpunktierte Darstellung in Fig. 1. The device for securing the cross member 18 against rotation can advantageously also be arranged such that it is effective between the cross member 18 and an adjacent housing wall 24. Here, for. B. a guide part 23 'can be arranged on the corresponding housing wall 24 and the associated groove 22' at the other end of the crossmember 18, see dash-dotted representation in Fig. 1st

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Ventilsteuerung für eine Hubkόlben-Brennkraftmaschine, bei der paarweise angeordnete hängende Ventile mit Hilfe eines Kipphebels gemeinsam betätigt werden, wobei die Bewegung des Kipphebels auf eine parallel zu den Ventilachsen zylindrisch geführte, mit beiden Ventilen zusammenwirkende Traverse übertragen wird und eine Vorrichtung das Verdrehen der Traverse um ihre Führungsachse verhindert, dadurch gekennzeichnet, daß die Vorrichtung in an sich bekannter Weise zwischen Kipphebel (14) und Traverse (18) wirksam ist, daß die Vorrichtung aus einer ein Führungsteil (23) gleitbar übergreifenden Nut (22) besteht, daß sich Führungsteil (23) und Nut (22) in einer parallel zu den Ventilachsen verlaufenden Ebene erstrecken und daß die Überlappung zwischen Nut (22) und Führungsteil (23) in Bewegungsrichtung der Traverse (18) größer als der Ventilhub ausgebildet ist.1.Valve control for a reciprocating piston internal combustion engine, in which hanging valves arranged in pairs are actuated together with the aid of a rocker arm, the movement of the rocker arm being transmitted to a crossbar which is parallel to the valve axes and cooperates with both valves, and a device for rotating the Traverse around its guide axis prevented, characterized in that the device is effective between rocker arm (14) and crossbar (18) in a manner known per se, that the device consists of a groove (22) which slidably overlaps a guide part (23), that Guide part (23) and groove (22) extend in a plane running parallel to the valve axes and that the overlap between groove (22) and guide part (23) in the direction of movement of the crossmember (18) is greater than the valve lift.
2. Ventilsteuerung nach Anspruch 1, dadurch gekennzeichnet, daß die Nut (22) an einem Ende der Traverse (18) außerhalb der Ventilachsen angeordnet ist.2. Valve control according to claim 1, characterized in that the groove (22) is arranged at one end of the crossmember (18) outside the valve axes.
3. Ventilsteuerung nach Anspruch 1, dadurch gekennzeichnet, daß das Führungsteil (23) aus einer an der Kipphebelnabe ausgebildeten Rippe besteht.3. Valve control according to claim 1, characterized in that the guide part (23) consists of a rib formed on the rocker arm hub.
4. Ventilsteuerung nach Anspruch 1, dadurch gekennzeichnet, daß die Vorrichtung zwischen der Traverse (18) und einer benachbarten Gehäusewand (24) wirksam ist. 4. Valve control according to claim 1, characterized in that the device between the crossmember (18) and an adjacent housing wall (24) is effective.
EP87903246A 1986-07-21 1987-05-21 Valve control for reciprocating piston internal combustion engine Withdrawn EP0274483A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3624612 1986-07-21
DE19863624612 DE3624612A1 (en) 1986-07-21 1986-07-21 VALVE CONTROL FOR A PISTON PISTON COMBUSTION ENGINE

Publications (1)

Publication Number Publication Date
EP0274483A1 true EP0274483A1 (en) 1988-07-20

Family

ID=6305633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87903246A Withdrawn EP0274483A1 (en) 1986-07-21 1987-05-21 Valve control for reciprocating piston internal combustion engine

Country Status (6)

Country Link
EP (1) EP0274483A1 (en)
JP (1) JPS63502683A (en)
CN (1) CN87104987A (en)
DE (1) DE3624612A1 (en)
ES (1) ES2005617A6 (en)
WO (1) WO1988000644A1 (en)

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
FR2633663B1 (en) * 1988-06-30 1993-08-06 Inst Francais Du Petrole IMMOBILIZING SYSTEM ROTATING A VALVE
DE4404378C2 (en) * 1993-02-20 2001-03-08 Volkswagen Ag Valve arrangement with a plurality of parallel-axis lift valves and a common actuation device
DE4410122C2 (en) * 1994-03-24 2003-05-08 Ina Schaeffler Kg Connection of a guide rail of a valve actuation device to a camshaft bearing
DE19539842A1 (en) * 1995-10-26 1997-04-30 Schaeffler Waelzlager Kg Valve gear for internal combustion engine
SE528784C2 (en) * 2005-06-07 2007-02-13 Scania Cv Abp Apparatus for transferring movement from a rocker arm to a valve device of an internal combustion engine and an internal combustion engine including such a device
JP4540116B2 (en) * 2006-02-13 2010-09-08 Ｕｄトラックス株式会社 Valve mechanism
US7523729B2 (en) * 2007-02-13 2009-04-28 Gm Global Technology Operations, Inc. Rocker assembly with adjustable swivel foot
US8006661B2 (en) * 2009-08-04 2011-08-30 International Engine Intellectual Property Company, Llc Bridge and pivot foot arrangement for operating engine cylinder valves
CN102022151B (en) * 2010-12-29 2012-07-04 潍柴动力扬州柴油机有限责任公司 Valve bridge of engine valve driving mechanism

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GB454761A (en) * 1936-02-25 1936-10-07 Joseph Maina Improvements in or relating to valve mechanisms for internal combustion engines
AT258041B (en) * 1965-06-11 1967-11-10 H C Hans Dipl Ing Dr Dr List Valve drive for an internal combustion engine
DE1906882A1 (en) * 1969-02-12 1970-09-03 Kloeckner Humboldt Deutz Ag Device for actuating several valves in reciprocating internal combustion engines
GB1298496A (en) * 1970-07-16 1972-12-06 English Electric Diesels Ltd Improvements in and relating to internal combustion engine valve gear
DE2055665A1 (en) * 1970-11-12 1972-05-18 Süddeutsche Bremsen-AG, 8000 München Device for actuating valves of internal combustion engines arranged in pairs
JPS4726732U (en) * 1971-04-12 1972-11-27
JPS4812802U (en) * 1971-06-22 1973-02-13
FR2553823B3 (en) * 1983-10-25 1986-01-03 Renault VALVE TAPPETER FOR INTERNAL COMBUSTION ENGINES AND OVERHEAD CAMSHAFTS
IT1182480B (en) * 1985-07-02 1987-10-05 Fiat Auto Spa TAPPING SYSTEM FOR INTERNAL COMBUSTION ENGINES EQUIPPED WITH SHAFTS WITH VARIABLE PROFILE CAMS

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Title
See references of WO8800644A1 *

Also Published As

Publication number Publication date
WO1988000644A1 (en) 1988-01-28
ES2005617A6 (en) 1989-03-16
DE3624612C2 (en) 1988-09-22
CN87104987A (en) 1988-02-03
DE3624612A1 (en) 1988-02-04
JPS63502683A (en) 1988-10-06

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