EP0504128B1 - Internal combustion engine cylinder head - Google Patents

Internal combustion engine cylinder head Download PDF

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Publication number
EP0504128B1
EP0504128B1 EP92890045A EP92890045A EP0504128B1 EP 0504128 B1 EP0504128 B1 EP 0504128B1 EP 92890045 A EP92890045 A EP 92890045A EP 92890045 A EP92890045 A EP 92890045A EP 0504128 B1 EP0504128 B1 EP 0504128B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
bridge
valve
valves
cylinder
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
EP92890045A
Other languages
German (de)
French (fr)
Other versions
EP0504128A1 (en
Inventor
Christof D. Dipl.-Ing. Fischer
Wolfgang Petutschnig
Karl Dipl.-Ing. Wojik
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 EP0504128A1 publication Critical patent/EP0504128A1/en
Application granted granted Critical
Publication of EP0504128B1 publication Critical patent/EP0504128B1/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
    • F01L1/26—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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
    • 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
    • F01L2001/188—Fulcrums at upper surface
    • 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
    • F02B2275/20—SOHC [Single 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
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to a cylinder head of an internal combustion engine with more than two hanging valves per cylinder, which are actuated via rocker arms, each rocker arm being mounted individually on the cylinder head via a bridge.
  • a cylinder head for an internal combustion engine in which the abutments of the rocker arms are inserted in a camshaft cover.
  • the two exhaust valves are actuated by separate rocker arms in this known cylinder head.
  • a common fork rocker arm is provided for the two inlet valves.
  • the object of the present invention is to create a cylinder head in which the largest possible number of identical parts is used and which is to be as compact as possible. In particular, a low overall height should be achieved.
  • rocker arm shaft allows extensive design freedom in the construction of the cylinder head. Due to the low position of the camshaft in the cylinder head, a particularly low overall height of the engine can be achieved. In particular, this can prevent the camshaft drive wheel, which normally projects high above the cylinder head, from protruding beyond the contour of the valve cover.
  • valve bridge guide By fastening the valve bridge to the bridge, there is no need for a valve bridge guide arranged between the valves, which is always very problematic in terms of design.
  • An extensive freedom from maintenance is achieved in that an element for automatic valve clearance compensation is provided on the bridge.
  • the element for valve clearance compensation is most advantageously integrated into the mounting of the rocker arm.
  • valve bridge In a further preferred embodiment variant of the invention it is provided that elements for automatic valve play compensation are provided in the valve bridge. This ensures correct valve clearance even in the event of different setting of individual valves.
  • a camshaft 1 is provided on the side of the cylinder head, on which intake cams 2 and exhaust cams 3 are attached. Furthermore two hanging intake valves 4a, 4b and exhaust valves 5a, 5b are provided in the cylinder head.
  • the inlet valves 4a and 4b are connected via a valve bridge 6. Accordingly, a valve bridge 7 is provided for the exhaust valves 5a and 5b.
  • a screw 8 is provided on valve bridge 6 for valve adjustment.
  • a screw 9 is arranged on the valve bridge 7.
  • the inlet valves 4a and 4b are actuated via a rocker arm 10.
  • a rocker arm 11 is provided for the outlet valves 5a and 5b.
  • the rocker arms 10 and 11 are supported in the pivot points 10 'and 11' via a bridge 12 in which hydraulic elements 13 and 14 for valve clearance compensation are arranged at different distances from the cylinder center plane 20.
  • the valve bridge 6 is suspended from the bridge 12 via a pin 15. In the same way, a pin 15a serves to suspend the valve bridge 7.
  • the rocker arm 10 is mounted on the bridge 12 via a connecting piece 16.
  • elements 17a and 17b are provided for valve clearance compensation for the valves 4a and 4b.
  • the elements 17a and 17b for valve clearance compensation are supplied with oil via oil channels 18 in the bridge 12, oil channels 19 in the pin 15 and oil channels 21 in the valve bridge 6a.

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)

Description

Die Erfindung betrifft einen Zylinderkopf einer Brennkraftmaschine mit mehr als zwei hängend angeordneten Ventilen pro Zylinder, die über Kipphebel betätigt werden, wobei jeder Kipphebel über eine Brücke einzeln am Zylinderkopf gelagert ist.The invention relates to a cylinder head of an internal combustion engine with more than two hanging valves per cylinder, which are actuated via rocker arms, each rocker arm being mounted individually on the cylinder head via a bridge.

Aus der DE-A- 37 43 854 ist ein Zylinderkopf für eine Brennkraftmaschine bekannt, bei dem die Widerlager der Kipphebel in einer Nockenwellenabdeckung eingesetzt sind. Die beiden Auslaßventile werden bei diesem bekannten Zylinderkopf von separaten Kipphebeln betätigt. Für die beiden Einlaßventile ist ein gemeinsamer Gabelkipphebel vorgesehen.From DE-A-37 43 854 a cylinder head for an internal combustion engine is known, in which the abutments of the rocker arms are inserted in a camshaft cover. The two exhaust valves are actuated by separate rocker arms in this known cylinder head. A common fork rocker arm is provided for the two inlet valves.

Grundvoraussetzung für eine solche Anordnung ist, daß die Nockenwelle zentral etwa im Bereich der die Zylinderachsen verbindenden Ebene angeordnet ist. Dies bedingt eine relativ hohe Bauweise, die in Kraftfahrzeugen, bei denen eine flache Motorhaube erwünscht ist, zu Problemen führen kann. Ein weiterer Nachteil des bekannten Zylinderkopfes ist, daß eine große Anzahl verschiedener Bauteile notwendig ist, was Produktion und Lagerhaltung erschwert. Außerdem haben sich die Gabelkipphebel in der Praxis als problematisch herausgestellt.The basic requirement for such an arrangement is that the camshaft is arranged centrally approximately in the region of the plane connecting the cylinder axes. This requires a relatively high construction, which can lead to problems in motor vehicles in which a flat bonnet is desired. Another disadvantage of the known cylinder head is that a large number of different components are necessary, which complicates production and storage. In addition, the fork rocker arms have proven to be problematic in practice.

Aufgabe der vorliegenden Erfindung ist es, einen Zylinderkopf zu schaffen, bei dem eine möglichst große Anzahl gleicher Teile verwendet wird und der möglichst kompakt auszuführen ist. Insbesondere soll eine niedrige Bauhöhe erreicht werden.The object of the present invention is to create a cylinder head in which the largest possible number of identical parts is used and which is to be as compact as possible. In particular, a low overall height should be achieved.

Erfindungsgemäß wird dies dadurch erreicht, daß pro Zylinder zwei Kipphebel vorgesehen sind, von denen mindestens einer auf eine Ventilbrücke zur Betätigung von zwei Ventilen gleicher Funktion einwirkt, daß weiters die mindestens eine Ventilbrücke an der Brücke gelagert ist, sowie daß die Drehpunkte der Kipphebel einen unterschiedlichen Abstand zur Zylindermittenebene aufweisen.According to the invention this is achieved in that two rocker arms are provided per cylinder, at least one of which acts on a valve bridge for actuating two valves of the same function, in addition that the at least one valve bridge is mounted on the bridge, and in that the pivot points of the rocker arms have a different one Have a distance to the cylinder center plane.

Besonders vorteilhaft bei der Erfindung ist es, daß selbst für den Fall, daß die Ventile nicht achsparallel zur Motormittenebene angeordnet sind, gleiche Kipphebel eingesetzt werden können, da der Drehpunkt für jeden Kipphebel beliebig gewählt werden kann. Der Wegfall der Kipphebelwelle ermöglicht eine weitgehende Gestaltungsfreiheit bei der Konstruktion des Zylinderkopfes. Durch die tiefe Lage der Nockenwelle im Zylinderkopf kann eine besonders niedrige Bauhöhe des Motors erreicht werden. Insbesonders kann dadurch verhindert werden, daß das normalerweise hoch über den Zylinderkopf ragende Nockenwellenantriebsrad über die Kontur des Ventildeckels hinausragt.It is particularly advantageous in the invention that even in the event that the valves are not arranged axially parallel to the engine center plane, the same rocker arms can be used, since the pivot point can be chosen arbitrarily for each rocker arm. The elimination of the rocker arm shaft allows extensive design freedom in the construction of the cylinder head. Due to the low position of the camshaft in the cylinder head, a particularly low overall height of the engine can be achieved. In particular, this can prevent the camshaft drive wheel, which normally projects high above the cylinder head, from protruding beyond the contour of the valve cover.

Durch die Befestigung der Ventilbrücke an der Brücke erübrigt sich eine zwischen den Ventilen angeordnete Ventilbrückenführung, die aus Platzgründen konstruktiv stets sehr problematisch ist.By fastening the valve bridge to the bridge, there is no need for a valve bridge guide arranged between the valves, which is always very problematic in terms of design.

Eine weitgehende Wartungsfreiheit wird dadurch erreicht, daß an der Brücke ein Element zum automatischen Ventilspielausgleich vorgesehen ist. Am günstigsten wird dabei das Element zum Ventilspielausgleich in die Lagerung des Kipphebels integriert.An extensive freedom from maintenance is achieved in that an element for automatic valve clearance compensation is provided on the bridge. The element for valve clearance compensation is most advantageously integrated into the mounting of the rocker arm.

In einer weiteren bevorzugten Ausführungsvariante der Erfindung ist vorgesehen, daß in der Ventilbrücke Elemente zum automatischen Ventilspielausgleich vorgesehen sind. Dadurch wird ein korrektes Ventilspiel auch für den Fall unterschiedlicher Setzung einzelner Ventile gewährleistet.In a further preferred embodiment variant of the invention it is provided that elements for automatic valve play compensation are provided in the valve bridge. This ensures correct valve clearance even in the event of different setting of individual valves.

Im folgenden wird die Erfindung anhand eines in den Fig. dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

  • Fig. 1 eine Ansicht eines erfindungsgemäßen Zylinderkopfes von oben,
  • Fig. 2 einen Schnitt nach Linie II-II in Fig. 1 und
  • Fig. 3 eine weitere Ausführungsvariante in einem der Fig. 2 entsprechenden Schnitt.
The invention is explained in more detail below on the basis of an exemplary embodiment shown in the figures. Show it:
  • 1 is a view of a cylinder head according to the invention from above,
  • Fig. 2 shows a section along line II-II in Fig. 1 and
  • Fig. 3 shows a further embodiment in a section corresponding to FIG. 2.

Am Zylinderkopf ist seitlich eine Nockenwelle 1 vorgesehen, an der Einlaßnocken 2 und Auslaßnocken 3 angebracht sind. Weiters sind im Zylinderkopf je zwei hängend angeordnete Einlaßventile 4a, 4b und Auslaßventile 5a, 5b vorgesehen. Die Einlaßventile 4a und 4b sind über eine Ventilbrücke 6 verbunden. Entsprechend ist eine Ventilbrücke 7 für die Auslaßventile 5a und 5b vorgesehen. Zur Ventileinstellung ist an der Ventilbrücke 6 eine Schraube 8 vorgesehen. Analog dazu ist an der Ventilbrücke 7 eine Schraube 9 angeordnet.A camshaft 1 is provided on the side of the cylinder head, on which intake cams 2 and exhaust cams 3 are attached. Furthermore two hanging intake valves 4a, 4b and exhaust valves 5a, 5b are provided in the cylinder head. The inlet valves 4a and 4b are connected via a valve bridge 6. Accordingly, a valve bridge 7 is provided for the exhaust valves 5a and 5b. A screw 8 is provided on valve bridge 6 for valve adjustment. Similarly, a screw 9 is arranged on the valve bridge 7.

Die Betätigung der Einlaßventile 4a und 4b erfolgt über einen Kipphebel 10. Für die Auslaßventile 5a und 5b ist ein Kipphe- bei 11 vorgesehen. Die Lagerung der Kipphebel 10 und 11 in den Drehpunkten 10' und 11' erfolgt über eine Brücke 12, in der hydraulische Elemente 13 und 14 zum Ventilspielausgleich in unterschiedlichem Abstand zur Zylindermittenebene 20 angeordnet sind. Die Ventilbrücke 6 ist über einen Stift 15 an der Brücke 12 aufgehängt. In gleicher Weise dient ein Stift 15a zur Aufhängung der Ventilbrücke 7.The inlet valves 4a and 4b are actuated via a rocker arm 10. A rocker arm 11 is provided for the outlet valves 5a and 5b. The rocker arms 10 and 11 are supported in the pivot points 10 'and 11' via a bridge 12 in which hydraulic elements 13 and 14 for valve clearance compensation are arranged at different distances from the cylinder center plane 20. The valve bridge 6 is suspended from the bridge 12 via a pin 15. In the same way, a pin 15a serves to suspend the valve bridge 7.

Bei der Ausführungsvariante von Fig. 3 erfolgt die Lagerung des Kipphebels 10 an der Brücke 12 über ein Verbindungsstück 16. In der Ventilbrücke 6a sind Elemente 17a und 17b zum Ventilspielausgleich für die Ventile 4a und 4b vorgesehen. Die Ölversorgung der Elemente 17a und 17b zum Ventilspielausgleich erfolgt über Ölkanäle 18 in der Brücke 12, Ölkanäle 19 im Stift 15 und Ölkanäle 21 in der Ventilbrücke 6a.3, the rocker arm 10 is mounted on the bridge 12 via a connecting piece 16. In the valve bridge 6a, elements 17a and 17b are provided for valve clearance compensation for the valves 4a and 4b. The elements 17a and 17b for valve clearance compensation are supplied with oil via oil channels 18 in the bridge 12, oil channels 19 in the pin 15 and oil channels 21 in the valve bridge 6a.

Claims (3)

  1. Cylinder head of an internal combustion engine with more than two overhead valves (4a, 4b; 5a, 5b) for each cylinder, which valves are actuated by rocker arms (10, 11), each rocker arm being individually supported on the cylinder head by means of a bridge (12), wherein two rocker arms (10, 11) are provided for each cylinder, one of which at least acts on a valve bridge (6, 6a, 7) actuating two valves (4a, 4b; 5a, 5b) of identical function, and wherein at least one valve bridge (6, 6a, 7) is supported by the bridge (12), and wherein the pivots (10', 11') of the rocker arms (10, 11) have different distances from the center plane (20) of the cylinder.
  2. Cylinder head according to claim 1, wherein the bridge (12) is provided with an element (13, 14) for automatic compensation of the valve clearance.
  3. Cylinder head according to claim 1, wherein elements (17a, 17b) for automatic compensation of the valve clearance are provided in the valve bridge (6a).
EP92890045A 1991-03-12 1992-02-25 Internal combustion engine cylinder head Expired - Lifetime EP0504128B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT545/91 1991-03-12
AT54591 1991-03-12

Publications (2)

Publication Number Publication Date
EP0504128A1 EP0504128A1 (en) 1992-09-16
EP0504128B1 true EP0504128B1 (en) 1994-02-02

Family

ID=3493442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92890045A Expired - Lifetime EP0504128B1 (en) 1991-03-12 1992-02-25 Internal combustion engine cylinder head

Country Status (3)

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US (1) US5150672A (en)
EP (1) EP0504128B1 (en)
DE (1) DE59200059D1 (en)

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Publication number Priority date Publication date Assignee Title
DE4039256C2 (en) * 1990-12-08 1996-05-09 Schaeffler Waelzlager Kg Device for the simultaneous actuation of two gas exchange valves of an internal combustion engine
US5365894A (en) * 1991-09-03 1994-11-22 Caterpillar Inc. Valve actuation device
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US5303680A (en) * 1993-06-10 1994-04-19 Eaton Corporation Lash adjusting mechanism for multi valve engine
WO1995000750A1 (en) * 1993-06-18 1995-01-05 Ina Wälzlager Schaeffler Kg Driven lever for actuating gas valves
DE4338845C2 (en) * 1993-11-13 1998-03-26 Schaeffler Waelzlager Kg Device for operating two gas exchange valves simultaneously
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
DE9405442U1 (en) * 1994-03-31 1995-08-03 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen 4-valve piston internal combustion engine
US5410995A (en) * 1994-04-15 1995-05-02 Cummins Engine Company, Inc. Valve crosshead assembly with wear-reducing contact pad
JPH0814013A (en) * 1994-06-28 1996-01-16 Hino Motors Ltd Valve mechanism for multivalve engine
KR100348384B1 (en) * 1995-03-27 2002-12-05 마츠다 가부시키가이샤 Direct Diesel Engine
US5645023A (en) * 1996-04-08 1997-07-08 Chrysler Corporation Valve train for an internal combustion engine
US5669344A (en) * 1996-08-09 1997-09-23 Chrysler Corporation Sohc system with radial valves
US5682849A (en) * 1996-10-04 1997-11-04 Chrysler Corporation Rocker arm-tappet connector for radial valves and vertically operating crosshead
DE19818195C2 (en) * 1998-04-23 2003-10-30 Opel Adam Ag Device for operating two gas exchange valves simultaneously
DE102008061412A1 (en) * 2008-07-11 2010-01-14 Man Nutzfahrzeuge Ag Hydraulic valve and EVB clearance compensation
US7984705B2 (en) 2009-01-05 2011-07-26 Zhou Yang Engine braking apparatus with two-level pressure control valves
GB201211534D0 (en) 2012-06-29 2012-08-08 Eaton Srl Valve bridge
CN111655978B (en) * 2017-11-22 2021-11-19 康明斯公司 Mechanical retention member for a valve train component

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DE1906882A1 (en) * 1969-02-12 1970-09-03 Kloeckner Humboldt Deutz Ag Device for actuating several valves in reciprocating internal combustion engines
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US4924821A (en) * 1988-12-22 1990-05-15 General Motors Corporation Hydraulic lash adjuster and bridge assembly

Also Published As

Publication number Publication date
US5150672A (en) 1992-09-29
DE59200059D1 (en) 1994-03-17
EP0504128A1 (en) 1992-09-16

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