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EP0113450B1 - Cylinder head for a four-stroke internal-combustion engine - Google Patents

Cylinder head for a four-stroke internal-combustion engine Download PDF

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Publication number
EP0113450B1
EP0113450B1 EP83112438A EP83112438A EP0113450B1 EP 0113450 B1 EP0113450 B1 EP 0113450B1 EP 83112438 A EP83112438 A EP 83112438A EP 83112438 A EP83112438 A EP 83112438A EP 0113450 B1 EP0113450 B1 EP 0113450B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
inlet valves
valves
valve
spark plug
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
Application number
EP83112438A
Other languages
German (de)
French (fr)
Other versions
EP0113450A1 (en
Inventor
Jiri Dipl.-Ing. Seidl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Filing date
Publication date
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Publication of EP0113450A1 publication Critical patent/EP0113450A1/en
Application granted granted Critical
Publication of EP0113450B1 publication Critical patent/EP0113450B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F01L1/02—Valve drive
    • 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
    • F01L1/022—Chain drive
    • 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
    • F01L1/024—Belt drive
    • 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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
    • F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings
    • 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
    • F01L2001/0535—Single overhead camshafts [SOHC]
    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L2003/25—Valve configurations in relation to engine
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1808—Number of cylinders two
    • 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
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Definitions

  • the invention relates to a cylinder head of a type according to the features specified in the preamble of the claim.
  • a known four-valve cylinder head each with two intake and exhaust valves in a V-position of a similar type according to DE-A-2 919 213, has a significantly higher construction cost for the additional second exhaust valve and its control.
  • either the valve size or V-angle size is limited by reciprocal stroke hindrance of an intake and an exhaust valve, and thus also prevents the gas exchange.
  • the spark gap of the spark plug is arranged approximately in the middle between all four valves, which would hinder the exhaust valve size in the case of three valves.
  • the invention avoids the disadvantages described by using the features according to the characterizing part of the patent claim in the case of a type-appropriate cylinder head.
  • the valve and spark plug arrangement provided with only one exhaust valve enables large valve opening cross sections, a compact combustion chamber design including almost central charge ignition and a favorable influence on the combustion process through a design and arrangement of a coordinated pinch gap which is favored by the intake valve arrangement.
  • a cylinder head 1 for spark-ignited four-stroke internal combustion engines contains three valves 2 and 3 in a V position with respect to one another.
  • Two inlet valves 2 are parallel to each other corresponding to a V-leg, which is determined by the plane of the two inlet valves 2.
  • the inlet valves 2 have an angle of approximately 37 ° to the cylinder axis 4.
  • the V-leg determined by an exhaust valve 3, on the other hand, only has an angle of approximately 15 ° to the cylinder axis 4.
  • a camshaft 5 is arranged in an angle bisecting position within the approx. 52 ° -V position of the intake and exhaust valves 2 and 3.
  • a tilting jack 6 is rotatably arranged on bearing axles 7.
  • the described V-position of the intake and exhaust valves 2 and 3 results in connection with the arrangement of the two intake valves 2 or their valve plate 2 'at a relatively large free distance and a spark plug 8 or its spark gap in this distance one for the size the valve opening cross sections and the combustion process advantageous design of the combustion chamber 9.
  • the valve plates 2 'and 3' are almost tangentially close to the contour 10 'of the associated cylinder 10 and the valve plate 2' at a relatively close distance from the valve plate 3 '.
  • the diameter of the valve plate 3 'of the exhaust valve 3 largely corresponds to the radius of the cylinder 10.
  • the valve plate 2' of the intake valve 2 overlap that axis 10 "of the contour 10 'of the cylinder 10 which is parallel to the plane of the intake valve 2.
  • a relatively large squeeze area 11 is formed which, in cooperation with a flat bottom portion 12' of a piston 12, forms a squeeze gap with a favorable influence on the combustion process.
  • the spark plug 8 is arranged with its longitudinal axis at a larger angle to the cylinder axis 4 than the shafts of the intake valves 2. This means that the Zünd needs more space candle 8 not between the space requirement of the valve springs 13 of the inlet valves 2 to advantage.
  • the spark plug 8 and its electrical connection have a particularly favorable accessibility for the maintenance of the relatively cold inlet outside of the cylinder head 1 during operation.

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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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Description

Die Erfindung bezieht sich auf einen Zylinderkopf einer Bauart gemäß den im Oberbegriff des Patentanspruches angegebenen Merkmalen.The invention relates to a cylinder head of a type according to the features specified in the preamble of the claim.

Bei einem bekannten Zylinderkopf dieser Bauart gemäß DE-B-1 127144 sind alle-drei Ventile im Dreieck und parallel zueinander angeordnet, wodurch eine weitgehend ebene Begrenzungswand des Brennraumes im Zylinderkopf unvermeidbar ist und alle Ventilteller auch in offener Stellung durch enges Tangieren der Zylinderwand die Ventil-Öffnungsquerschnitte in diesem Bereich verengen und dadurch den Ladungswechsel behindern. In diesem ungünstigen Sinne wirkt auch der im Verhältnis zum Gesamt-Öffnungsquerschnitt der beiden Einlaßventile relativ kleine Ventilteller-Durchmesser des Auslaßventiles. Schließlich wird auch bei fremdgezündeter Ausbildung dieser bekannten Maschine der Verbrennungsablauf durch den breiten ringförmig umlaufenden Quetschspalt ungünstig beeinflußt, der auch im Bereich des im Betrieb sehr heißen Auslaßventiles besteht, in dem dadurch bevorzugt Selbstzündungen verursacht werden.In a known cylinder head of this type according to DE-B-1 127144, all-three valves are arranged in a triangle and parallel to one another, as a result of which a largely flat boundary wall of the combustion chamber in the cylinder head is unavoidable and all valve disks, even in the open position, due to the cylinder wall being closely tangent to the valve - Narrow opening cross-sections in this area and thereby hinder the gas exchange. In this unfavorable sense, the valve disk diameter of the exhaust valve, which is relatively small in relation to the total opening cross section of the two intake valves, also acts. Finally, even in the case of a spark-ignited design of this known machine, the combustion process is adversely affected by the wide ring-shaped pinch gap, which also exists in the area of the exhaust valve which is very hot during operation, in which auto-ignition is preferably caused thereby.

Bekannte Zylinderköpfe ähnlicher Bauart mit V-Stellung der Ventile gemäß DE-C-708 283, DE-C-755 495 und DE-Z-Motorrad, Heft 24/1,980, S. 28 und 30 weisen eine ungünstige Anordnung der Ventile und der Zündkerze in Bezug auf die Brennraumgestaltung auf, wodurch einerseits die Fläche des Brennraums für eine Abstimmung zwischen Ventilgröße und Quetschspaltgröße ungenügend genutzt und andererseits eine dezentrale Ladungszündung mit nachteiligen Einfluß auf den Verbrennungsvorgang gegeben ist.Known cylinder heads of a similar design with V-position of the valves according to DE-C-708 283, DE-C-755 495 and DE-Z-Motorrad, issue 24 / 1,980, pages 28 and 30 have an unfavorable arrangement of the valves and the spark plug in relation to the combustion chamber design, whereby on the one hand the surface of the combustion chamber is insufficiently used for a coordination between valve size and pinch gap size and on the other hand there is a decentralized charge ignition with an adverse influence on the combustion process.

Ein bekannter Vierventil-Zylinderkopf mit je zwei Ein- und Auslaßventilen in V-Stellung ähnlicher Bauart gemäß DE-A-2 919 213 weist einen wesentlichen höheren Bauaufwand für das zusätzliche zweite Auslaßventil und dessen Steuerung auf. Darüber hinaus wird dabei entweder die Ventilgröße oder V-Winkel-Größe durch jeweils gegenseitige Hub-Behinderung eines Ein- und eines Auslaßventiles begrenzt und damit der Ladungswechsel gleichfalls behindert. Die Funkenstrecke der Zündkerze ist dabei etwa mittig zwischen allen vier Ventilen angeordnet, was bei drei Ventilen die Auslaßventil-Größe behindern würde.A known four-valve cylinder head, each with two intake and exhaust valves in a V-position of a similar type according to DE-A-2 919 213, has a significantly higher construction cost for the additional second exhaust valve and its control. In addition, either the valve size or V-angle size is limited by reciprocal stroke hindrance of an intake and an exhaust valve, and thus also prevents the gas exchange. The spark gap of the spark plug is arranged approximately in the middle between all four valves, which would hinder the exhaust valve size in the case of three valves.

Die Erfindung vermeidet die beschriebenen Nachteile durch die Anwendung der Merkmale gemäß dem Kennzeichen des Patentanspruches bei einem bauartgemäßen Zylinderkopf. Die dabei vorgesehene Ventil- und Zündkerzen-Anordnung mit nur einem Auslaßventil ermöglicht große Ventilöffnungsquerschnitte, eine kompakte Brennraumgestaltung einschließlich nahezu zentraler Ladungszündung und eine günstige Beeinflussung des Verbrennungsablaufes durch eine von der Einlaßventil-Anordnung begünstigte Ausbildung und Anordnung eines abgestimmten Quetschspaltes.The invention avoids the disadvantages described by using the features according to the characterizing part of the patent claim in the case of a type-appropriate cylinder head. The valve and spark plug arrangement provided with only one exhaust valve enables large valve opening cross sections, a compact combustion chamber design including almost central charge ignition and a favorable influence on the combustion process through a design and arrangement of a coordinated pinch gap which is favored by the intake valve arrangement.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen :

  • Figur 1 einen Zylinderkopf für Viertakt-Brennkraftmaschinen im Schnitt und
  • Figur 2 die Innenansicht des Brennraumes im Zylinderkopf gemäß der Linie 11-11 in Fig. 1.
In the drawing, an embodiment of the invention is shown. Show it :
  • Figure 1 shows a cylinder head for four-stroke internal combustion engines in section and
  • FIG. 2 shows the interior view of the combustion chamber in the cylinder head according to line 11-11 in FIG. 1.

Ein Zylinderkopf 1 für fremdgezündete Viertakt-Brennkraftmaschinen enthält drei Ventile 2 und 3 in V-Stellung zueinander. Zwei Einlaßventile 2 liegen parallel zueinander entsprechend-einem V-Schenkel, der von der Ebene der beiden Einlaßventile 2 bestimmt ist. Zur Zylinderachse 4 weisen die Einlaßventile 2 einen Winkel von ca. 37° auf. Der von einem Auslaßventil 3 bestimmte V-Schenkel weist dagegen nur einen Winkel von ca. 15° zur Zylinderachse 4 auf. Eine Nockenwelle 5 ist in einer winkelhalbierenden Lage innerhalb der ca. 52°-V-Stellung der Einlaß- und Auslaßventile 2 und 3 angeordnet. Für die Antriebsverbindung zwischen der Nockenwelle 5 und den Ein- und Auslaßventilen 2 und 3 ist je ein Kipphebei 6 auf Lagerachsen 7 drehbeweglich angeordnet.A cylinder head 1 for spark-ignited four-stroke internal combustion engines contains three valves 2 and 3 in a V position with respect to one another. Two inlet valves 2 are parallel to each other corresponding to a V-leg, which is determined by the plane of the two inlet valves 2. The inlet valves 2 have an angle of approximately 37 ° to the cylinder axis 4. The V-leg determined by an exhaust valve 3, on the other hand, only has an angle of approximately 15 ° to the cylinder axis 4. A camshaft 5 is arranged in an angle bisecting position within the approx. 52 ° -V position of the intake and exhaust valves 2 and 3. For the drive connection between the camshaft 5 and the intake and exhaust valves 2 and 3, a tilting jack 6 is rotatably arranged on bearing axles 7.

Die beschriebene V-Stellung der Ein- und Auslaßventile 2 und 3 ergibt in Verbindung mit der Anordnung der beiden Einlaßventile 2 bzw. deren Ventilteller 2' in einem relativ großen freien Abstand und einer Zündkerze 8 bzw. deren Funkenstrecke in diesem Abstand eine für die Größe der Ventilöffnungsquerschnitte und den Verbrennungsvorgang vorteilhafte Gestaltung des Brennraumes 9. Zu diesem Zweck liegen auch die Ventilteller 2' und 3' nahezu tangierend eng an der Kontur 10' des zugehörigen Zylinders 10 sowie die Ventilteller 2' in relativ engem Abstand zum Ventilteller 3'. Der Durchmesser des Ventiltellers 3' des Auslaßventiles 3 entspricht weitgehend dem Radius des Zylinders 10. Die Ventilteller 2' der Einlaßventile 2 übergreifen dabei diejenige Achse 10" der Kontur 10' des Zylinders 10, die parallel zur Ebene der Einlaßventile 2 liegt. Diese Anordnung der Ein- und Auslaßventile 2 und 3 bzw. deren Ventilteller 2' und 3' und der Funkenstrecke der Zündkerze 8 zwischen den Ventiltellern 2' ergibt eine günstige Abstimmung der Ventilöffnungsquerschnitte der Ein- und Auslaßventile 2 und 3 aufeinander und eine nahezu zentrische Lage der Funkenstrecke der Zündkerze 8 im Brennraum 9 mit günstigen Auswirkungen auf die Maschinenfunktion hinsichtlich Leistungsverhalten und Kraftstoffverbrauch.The described V-position of the intake and exhaust valves 2 and 3 results in connection with the arrangement of the two intake valves 2 or their valve plate 2 'at a relatively large free distance and a spark plug 8 or its spark gap in this distance one for the size the valve opening cross sections and the combustion process advantageous design of the combustion chamber 9. For this purpose, the valve plates 2 'and 3' are almost tangentially close to the contour 10 'of the associated cylinder 10 and the valve plate 2' at a relatively close distance from the valve plate 3 '. The diameter of the valve plate 3 'of the exhaust valve 3 largely corresponds to the radius of the cylinder 10. The valve plate 2' of the intake valve 2 overlap that axis 10 "of the contour 10 'of the cylinder 10 which is parallel to the plane of the intake valve 2. This arrangement of the Inlet and outlet valves 2 and 3 or their valve plates 2 'and 3' and the spark gap of the spark plug 8 between the valve plates 2 'results in a favorable coordination of the valve opening cross sections of the inlet and outlet valves 2 and 3 with one another and an almost central position of the spark gap Spark plug 8 in the combustion chamber 9 with favorable effects on the machine function in terms of performance and fuel consumption.

Im Bereich des Brennraumes 9 außerhalb der Ventilteller 2' der Einlaßventile 2 ist eine relativ große Quetschfläche 11 ausgebildet, die im Zusammenwirken mit einem flachen Bodenabschnitt 12' eines Kolbens 12 einen Quetschspalt mit günstigem Einfluß auf den Verbrennungsvorgang bildet.In the area of the combustion chamber 9 outside the valve plate 2 'of the inlet valves 2, a relatively large squeeze area 11 is formed which, in cooperation with a flat bottom portion 12' of a piston 12, forms a squeeze gap with a favorable influence on the combustion process.

Die Zündkerze 8 ist mit ihrer Längsachse in einem größeren Winkel zur Zylinderachse 4 als die Schäfte der Einlaßventile 2 angeordnet. Dadurch kommt der Einbau-Raumbedarf der Zündkerze 8 nicht zwischen dem Raumbedarf der Ventilfedern 13 der Einlaßventile 2 zur Geltung. Darüber hinaus weist die Zündkerze 8 und deren elektrischer Anschluß dadurch eine besonders günstige Zugänglichkeit für die Wartung von der im Betrieb relativ kalten Einlaß-Außenseite des Zylinderkopfes 1 auf.The spark plug 8 is arranged with its longitudinal axis at a larger angle to the cylinder axis 4 than the shafts of the intake valves 2. This means that the Zünd needs more space candle 8 not between the space requirement of the valve springs 13 of the inlet valves 2 to advantage. In addition, the spark plug 8 and its electrical connection have a particularly favorable accessibility for the maintenance of the relatively cold inlet outside of the cylinder head 1 during operation.

Claims (1)

  1. A cylinder head (1) for four-stroke internal combustion engines, with overhead inlet and exhaust valves (2 and 3) where, for each cylinder (10), two inlet valves (2) are arranged parallel to each other and side by side,
    there being an exhaust valve (3) and a spark plug (8) arranged in one transverse plane containing the cylinder axis (4) and arranged equidistantly between the two inlet valves (2),
    the exhaust valve (3) being arranged so as to be spaced from the plane determined by the inlet valves (2) and
    the spark gap of the spark plug (8) is arranged substantially centrally between the inlet valves (2) with the longitudinal axis of the spark plug (8) being arranged at an angle outwardly open from the plane of the inlet valves,
    while furthermore, in their closed position in each case, the valve discs (2' and 3') of the inlet and exhaust valves (2 and 3) are substantially tangential to the circular contour (10') of the cylinder (10) and the valve discs (2') of the inlet valves (2) extend over that axis (10") of the circular contour (10') which lies parallel to the said plane,

    characterised in that
    for each cylinder, the two mutually parallel inlet valves (2) form a V-arrangement with the one exhaust valve,
    that the longitudinal axis of the spark plug (8) includes with the axis of the exhaust valve (3) a larger angle than does the plane determined by the axes of the inlet valves (2),
    that the valve disc (3') of the exhaust valve (3) has a diameter substantially equal to the radius of the circular contour (10') of the cylinder (10) and
    that, in the region between the inlet valves (2) and the spark plug (8) for the one part and the associated part of the circular contour (10') of the cylinder (10), a pinch surface (11) is developed as a limitation for a pinch gap occurring in co-operation with a crown section (12') of a respective piston (12).
EP83112438A 1981-06-26 1982-06-18 Cylinder head for a four-stroke internal-combustion engine Expired EP0113450B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813125077 DE3125077A1 (en) 1981-06-26 1981-06-26 TWO-CYLINDER FOUR-STOCK BOXER ENGINE, ESPECIALLY DRIVE WIND AIR-COOLED FOR MOTORCYCLES
DE3125077 1981-06-26

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP82105324.6 Division 1982-06-18

Publications (2)

Publication Number Publication Date
EP0113450A1 EP0113450A1 (en) 1984-07-18
EP0113450B1 true EP0113450B1 (en) 1986-09-10

Family

ID=6135396

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82105324A Expired EP0068336B1 (en) 1981-06-26 1982-06-18 Two-cylinder four-stroke boxer engine, particularly for a motor cyle, cooled by the oncoming air flux
EP83112438A Expired EP0113450B1 (en) 1981-06-26 1982-06-18 Cylinder head for a four-stroke internal-combustion engine

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP82105324A Expired EP0068336B1 (en) 1981-06-26 1982-06-18 Two-cylinder four-stroke boxer engine, particularly for a motor cyle, cooled by the oncoming air flux

Country Status (5)

Country Link
US (1) US4558676A (en)
EP (2) EP0068336B1 (en)
JP (1) JPS58501045A (en)
DE (3) DE3125077A1 (en)
WO (1) WO1983000188A1 (en)

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Also Published As

Publication number Publication date
DE3125077A1 (en) 1983-01-13
DE3273260D1 (en) 1986-10-16
JPS6127569B2 (en) 1986-06-26
US4558676A (en) 1985-12-17
WO1983000188A1 (en) 1983-01-20
DE3262212D1 (en) 1985-03-21
EP0068336A1 (en) 1983-01-05
EP0068336B1 (en) 1985-02-06
JPS58501045A (en) 1983-06-30
EP0113450A1 (en) 1984-07-18

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