DE4018586A1 - IC-engine with twin camshaft - has rocker arms mounted on pin aligned parallel to camshafts - Google Patents

IC-engine with twin camshaft - has rocker arms mounted on pin aligned parallel to camshafts

Info

Publication number
DE4018586A1
DE4018586A1 DE4018586A DE4018586A DE4018586A1 DE 4018586 A1 DE4018586 A1 DE 4018586A1 DE 4018586 A DE4018586 A DE 4018586A DE 4018586 A DE4018586 A DE 4018586A DE 4018586 A1 DE4018586 A1 DE 4018586A1
Authority
DE
Germany
Prior art keywords
cylinder head
rocker arms
camshafts
camshaft
levers
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Withdrawn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
DE4018586A
Other languages
German (de)
Inventor
Ulrich Dipl Ing Baretzky
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.)
Audi AG
Original Assignee
Audi AG
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 Audi AG filed Critical Audi AG
Priority to DE4018586A priority Critical patent/DE4018586A1/en
Publication of DE4018586A1 publication Critical patent/DE4018586A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • 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

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  • 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)

Abstract

The ic-engine has a cylinder head with twin overhead camshafts (9,12) with cams (8,11). These cams actuate the valves (3,4) through rocker arms (10,13). A tubular fitting (7) positioned between the camshafts provides access to the sparking plug (5) or fuel injection nozzle. The fitting has a transverse bore which has its axis aligned parallel with the axes of the crankshafts. This bore lies on a diameter of the fitting and receives a pin which extends beyond the wall of the fitting. This extension of the pin forms a bearing for one or both rocker arms.

Description

Die Erfindung bezieht sich auf einen Zylinderkopf für eine ventilgesteuerte Hubkolben-Brennkraftmaschine entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a cylinder head for a valve-controlled reciprocating piston internal combustion engine accordingly the preamble of claim 1.

Bei bekannten Rohstruktionen sind die Achsen der Ventil­ betätigungshebel (Schlepphebel, Kipphebel) durch eigene Lagerungen im Zylinderkopf gelagert. Der hierfür erforder­ liche Bauraum bereitet insbesondere bei Brennkraftmaschinen mit mehr als zwei Ventilen pro Zylinder erhebliche Probleme, zumal im Hinblick auf einen möglichst kompakten Brennraum ein kleiner Ventilwinkel angestrebt wird, mit der Folge, daß gegenüberliegende Einlaß- und Auslaßventile an ihren oberen Enden nur einen relativ kleinen Abstand voneinander haben.In known raw designs, the axes are the valve operating lever (rocker arm, rocker arm) by own Bearings stored in the cylinder head. The necessary for this Liche space prepares especially for internal combustion engines significant problems with more than two valves per cylinder, especially with regard to the most compact combustion chamber possible a small valve angle is sought, with the result that opposite inlet and outlet valves at their upper Ends are only a relatively small distance apart.

Der Erfindung liegt die Aufgabe zugrunde, einen Zylinderkopf der gattungsgemäßen Art zu schaffen, bei dem eine äußerst platzsparende Lagerung der Ventilbetätigungshebel verwirklicht ist.The invention has for its object a cylinder head to create the generic type, in which an extreme space-saving storage of the valve actuation levers is realized.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the in the license plate of the specified features solved.

Durch die vorgeschlagene Ausbildung der Schachtfortsätze für die Lagerung der Ventilbetätigungshebel können sowohl der Platzbedarf als auch das Gewicht eigener Lagerungen für diese Hebel eingespart werden. Da die Schachtfortsätze vor­ zugsweise in der Längsmittelebene des Zylinderkopfes liegen, kann durch die vorgeschlagene Lagerung der Hebel ein schmal bauender Zylinderkopf verwirklicht werden, was insbesondere beim Einbau derartiger Brennkraftmaschinen in Kraftfahrzeuge wegen der beengten Raumverhältnisse im Motorraum von Bedeu­ tung ist. Due to the proposed design of the shaft extensions for the storage of the valve actuation lever can both Space requirements as well as the weight of your own bearings for these levers can be saved. As the shaft extensions before preferably lie in the longitudinal center plane of the cylinder head, can be narrow due to the proposed storage of the lever building cylinder head can be realized, which in particular when installing such internal combustion engines in motor vehicles because of the limited space in the engine compartment from Bedeu tung is.  

Die Achsen können in die Bohrungen in den Schachtfortsätzen eingepreßt oder eingeschrumpft werden und sind daher äußerst einfach zu montieren. Bei Zylinderköpfen mit zwei Nocken­ wellen können zwei Ventilbetätigungshebel auf einer gemein­ samen Achse gelagert werden, wodurch sich insbesondere bei Mehrventil-Brennkraftmaschinen eine beträchtliche Platzer­ sparnis ergibt.The axes can be in the holes in the shaft extensions are pressed or shrunk and are therefore extreme easy to assemble. For cylinder heads with two cams Shafts can have two valve actuators on one common seed axis are stored, which is particularly at Multi-valve internal combustion engines are a considerable burst saving results.

Ein Ausführungsbeispiel der Erfindung wird im folgenden unter Bezugnahme auf die Zeichnungen beschrieben. Es zeigt:An embodiment of the invention is as follows described with reference to the drawings. It shows:

Fig. 1 einen Querschnitt eines Zylinderkopfes, und Fig. 1 shows a cross section of a cylinder head, and

Fig. 2 eine Draufsicht des Zylinderkopfes von Fig. 1, teilweise geschnitten. Fig. 2 is a plan view of the cylinder head of Fig. 1, partially in section.

In den Zeichnungen ist mit 1 der Zylinderkopf einer Mehr­ zylinder-Brennkraftmaschine bezeichnet, der für jeden Zylinder 2 zwei Einlaßventile 3 und zwei Auslaßventile 4 aufweist, von denen nur jeweils eines dargestellt ist. Für jeden Zylinder 2 ist ein zur Aufnahme einer Zündkerze 5 bestimmter Schacht 6 mit einem sich zwischen den Ventilen nach oben erstreckenden hohlzylindrischen Fortsatz 7 vor­ gesehen. Die Einlaßventile 3 werden von den Nocken 8 einer Einlaßnockenwelle 9 über Schlepphebel 10 und die Auslaß­ ventile 4 werden von den Nocken 11 einer Auslaßnockenwelle 12 über Schlepphebel 13 betätigt. Jeweils ein Schlepp­ hebel 10 und ein Schlepphebel 13 sind auf einer gemeinsamen Achse 14 fliegend gelagert, die in eine Bohrung 15 im Schachtfortsatz 7 eingepreßt oder eingeschrumpft ist. Die Bohrungen 15 verlaufen parallel zu den Nockenwellen 9 und 12 und erstrecken sich diametral durch die Wand der Schacht­ fortsätze 7. Wie aus Fig. 2 ersichtlich ist, ist in jedem Bohrungsabschnitt eine seitlich vorstehende Achse 14 ein­ gepreßt, auf der die Schlepphebel für die einander gegen­ überliegenden Ventile eines Zylinders gelagert sind. In the drawings, 1 denotes the cylinder head of a multi-cylinder internal combustion engine, which has two intake valves 3 and two exhaust valves 4 for each cylinder 2 , only one of which is shown in each case. For each cylinder 2 , a shaft 6 intended for receiving a spark plug 5 is seen with a hollow cylindrical extension 7 extending upwards between the valves. The intake valves 3 are actuated by the cams 8 of an intake camshaft 9 via rocker arms 10 and the exhaust valves 4 are actuated by the cams 11 of an exhaust camshaft 12 via rocker arms 13 . In each case a drag lever 10 and a rocker arm 13 are overhung on a common axis 14 which is pressed or shrunk into a bore 15 in the shaft extension 7 . The bores 15 run parallel to the camshafts 9 and 12 and extend diametrically through the wall of the shaft extensions 7 . As can be seen from Fig. 2, a laterally projecting axis 14 is pressed in each bore section, on which the rocker arms for the opposing valves of a cylinder are mounted.

Durch die Verwendung der Schachtfortsätze 7 für die Lagerung der Schlepphebel 10, 13 entfällt der Platzbedarf für eigene Lagerstellen für die Achsen dieser Schlepphebel, und es können ein schmaler Zylinderkopf und kleine Ventilwinkel verwirklicht werden.By using the shaft extensions 7 for the storage of the rocker arms 10 , 13 , the space required for their own bearings for the axles of these rocker arms is eliminated, and a narrow cylinder head and small valve angles can be realized.

Die Erfindung ist nicht auf das dargestellte Ausführungsbei­ spiel beschränkt, sondern auch bei Brennkraftmaschinen an­ wendbar, deren Ventile durch Kipphebel betätigt werden. Die Vorteile der vorgeschlagenen Lagerung der Ventilbetätigungs­ hebel bestehen auch für Brennkraftmaschinen mit nur einem Einlaß- und einem Auslaßventil pro Zylinder. In diesem Falle ist naturgemäß auf jedem der beiden seitlich vorstehenden Achsen 14 nur ein Ventilbetätigungshebel gelagert.The invention is not limited to the game Ausführungsbei shown, but also in internal combustion engines to reversible, whose valves are actuated by rocker arms. The advantages of the proposed mounting of the valve actuation lever also exist for internal combustion engines with only one intake and one exhaust valve per cylinder. In this case, only one valve actuation lever is naturally mounted on each of the two laterally projecting axes 14 .

Claims (4)

1. Zylinderkopf für eine ventilgesteuerte Hubkolben-Brenn­ kraftmaschine, mit mindestens einer Nockenwelle (9, 12), deren Nocken (8 bzw. 11) die Ventile (3, 4) über schwenk­ bar auf einer Achse (14) gelagerte Hebel (10, 13) be­ tätigen, und der für jeden Zylinder (2) einen zur Auf­ nahme einer Zündkerze (5) oder eines Einspritzventils bestimmten Schacht (6) mit einem sich zwischen den Ven­ tilen nach oben erstreckenden, hohlzylindrischen Fortsatz (7) aufweist, dadurch gekennzeichnet, daß in der Wand jedes Schachtforsatzes (7) eine zur Nockenwelle (9, 12) parallele Bohrung (15) vorgesehen ist, in die eine Achse (14) eingesetzt ist, auf welcher mindestens einer der Hebel (10, 13) fliegend gelagert ist.1. Cylinder head for a valve-controlled reciprocating internal combustion engine, with at least one camshaft ( 9 , 12 ), the cams ( 8 or 11 ) of which the valves ( 3 , 4 ) are pivoted on an axle ( 14 ) with levers ( 10 , 13 ) be actuate, and for each cylinder ( 2 ) has a for receiving a spark plug ( 5 ) or an injection valve shaft ( 6 ) with an upwardly extending between the Ven valves, hollow cylindrical extension ( 7 ), characterized that one is provided to the cam shaft (9, 12) parallel to the bore (15) in the wall of each Schachtforsatzes (7) is inserted in an axis (14) on which at least one of the levers (10, 13) is mounted overhung . 2. Zylinderkopf nach Anspruch 1, dadurch gekennzeichnet, daß sich die Bohrung (15) diametral durch die Wand des Schachtfortsatzes (7) erstreckt und jeder Bohrungsab­ schnitt eine seitlich vorstehende Achse (14) für die Lagerung mindestens eines der Hebel (10, 13) aufnimmt.2. Cylinder head according to claim 1, characterized in that the bore ( 15 ) extends diametrically through the wall of the shaft extension ( 7 ) and each Bohrungsab cut a laterally projecting axis ( 14 ) for the storage of at least one of the levers ( 10 , 13 ) records. 3. Zylinderkopf nach Anspruch 1 oder 2 mit zwei parallelen Nockenwellen (9, 12), dadurch gekennzeichnet, daß auf jeder Achse (14) zwei Hebel (10, 13) gelagert sind, von denen der eine Hebel (10) mit einem Nocken (8) der ersten Nockenwelle (9) und der andere Hebel (13) mit einem Nocken (11) der zweiten Nockenwelle (12) zusammenwirkt.3. Cylinder head according to claim 1 or 2 with two parallel camshafts ( 9 , 12 ), characterized in that on each axis ( 14 ) two levers ( 10 , 13 ) are mounted, of which one lever ( 10 ) with a cam ( 8 ) of the first camshaft ( 9 ) and the other lever ( 13 ) cooperates with a cam ( 11 ) of the second camshaft ( 12 ). 4. Zylinderkopf nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Achsen (14) in die Bohrungen (15) eingepreßt oder eingeschrumpft sind.4. Cylinder head according to one of claims 1 to 3, characterized in that the axes ( 14 ) in the bores ( 15 ) are pressed or shrunk.
DE4018586A 1990-06-09 1990-06-09 IC-engine with twin camshaft - has rocker arms mounted on pin aligned parallel to camshafts Withdrawn DE4018586A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4018586A DE4018586A1 (en) 1990-06-09 1990-06-09 IC-engine with twin camshaft - has rocker arms mounted on pin aligned parallel to camshafts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4018586A DE4018586A1 (en) 1990-06-09 1990-06-09 IC-engine with twin camshaft - has rocker arms mounted on pin aligned parallel to camshafts

Publications (1)

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DE4018586A1 true DE4018586A1 (en) 1991-12-12

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DE4018586A Withdrawn DE4018586A1 (en) 1990-06-09 1990-06-09 IC-engine with twin camshaft - has rocker arms mounted on pin aligned parallel to camshafts

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236600A1 (en) * 1992-10-29 1994-05-05 Audi Ag Valve actuation mechanism for IC engine - has drag levers arranged on opposite sides of central longitudinal plane
EP1375843A1 (en) * 2002-06-28 2004-01-02 AVL List GmbH Internal combustion engine
JP2011064115A (en) * 2009-09-16 2011-03-31 Honda Motor Co Ltd Ignition device attachment structure for internal combustion engine
DE102012022700A1 (en) * 2012-11-21 2014-05-22 Daimler Ag Internal combustion engine for a motor vehicle and motor vehicle with such an internal combustion engine
EP3379044A1 (en) * 2017-03-21 2018-09-26 Honda Motor Co., Ltd. Dohc-type internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526328B1 (en) * 1962-04-10 1969-09-11 Renault Mixture-compressing internal combustion engine with hemispherical combustion chamber
DE3842175A1 (en) * 1988-06-01 1989-12-07 Bayerische Motoren Werke Ag Cylinder head with cover for internal combustion engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526328B1 (en) * 1962-04-10 1969-09-11 Renault Mixture-compressing internal combustion engine with hemispherical combustion chamber
DE3842175A1 (en) * 1988-06-01 1989-12-07 Bayerische Motoren Werke Ag Cylinder head with cover for internal combustion engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 1-110864 A. In: Patents Abstracts of Japan. M-854 July 24, 1989 Vol.13/No.327 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236600A1 (en) * 1992-10-29 1994-05-05 Audi Ag Valve actuation mechanism for IC engine - has drag levers arranged on opposite sides of central longitudinal plane
DE4236600C2 (en) * 1992-10-29 1999-03-11 Audi Ag Valve actuation mechanism for a multi-cylinder internal combustion engine
EP1375843A1 (en) * 2002-06-28 2004-01-02 AVL List GmbH Internal combustion engine
JP2011064115A (en) * 2009-09-16 2011-03-31 Honda Motor Co Ltd Ignition device attachment structure for internal combustion engine
DE102012022700A1 (en) * 2012-11-21 2014-05-22 Daimler Ag Internal combustion engine for a motor vehicle and motor vehicle with such an internal combustion engine
EP3379044A1 (en) * 2017-03-21 2018-09-26 Honda Motor Co., Ltd. Dohc-type internal combustion engine
US10309265B2 (en) 2017-03-21 2019-06-04 Honda Motor Co., Ltd. DOHC-type internal combustion engine

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