EP0121728A2 - Two-cylinder four-stroke internal-combustion engine, in particular for motor-cycles with a crankshaft arranged in the direction of travel - Google Patents

Two-cylinder four-stroke internal-combustion engine, in particular for motor-cycles with a crankshaft arranged in the direction of travel Download PDF

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Publication number
EP0121728A2
EP0121728A2 EP84102133A EP84102133A EP0121728A2 EP 0121728 A2 EP0121728 A2 EP 0121728A2 EP 84102133 A EP84102133 A EP 84102133A EP 84102133 A EP84102133 A EP 84102133A EP 0121728 A2 EP0121728 A2 EP 0121728A2
Authority
EP
European Patent Office
Prior art keywords
crankshaft
intermediate shaft
counterweights
combustion engine
cylinders
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Withdrawn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
EP84102133A
Other languages
German (de)
French (fr)
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EP0121728A3 (en
Inventor
Otto Pukl
Franz Zinnecker
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0121728A2 publication Critical patent/EP0121728A2/en
Publication of EP0121728A3 publication Critical patent/EP0121728A3/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/06—Engines with means for equalising torque
    • 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
    • F01L1/026—Gear 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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a two-cylinder, four-stroke internal combustion engine of the type according to the preamble of claim 1.
  • the object of the invention is to at least largely eliminate the mass torques and reverse torques by means of a compensating device with little additional construction effort and space requirements.
  • claims 2 and 3 further develop the compensation of the reverse torques, in which further rotating machine and auxiliary units are used for this without any significant additional expenditure.
  • the use of an additional intermediate shaft results in the advantage of a spatially favorable arrangement of the 1: 1 chain or toothed belt drives for the camshafts with space- and weight-saving control housings and camshaft-side control wheels, which more than compensates for their own effort.
  • a two-cylinder four-stroke boxer engine for motorcycles has according to FIG. 1 u. 3 a motor housing 1, two mutually opposite cylinders 2 and cylinder heads 3 assigned to them.
  • a crankshaft 4 is rotatably supported in three bearings 5.
  • the crankshaft 4 has two crank pins 6, which are arranged rotated relative to one another by 180 ° crank angle and are each assigned to a piston 7 guided in the cylinders 2 via connecting rods 8.
  • the crank pin 6 on the opposite side, a pair of crankshaft counterweights 9 is fastened to the crankshaft 4. According to the distance between the crank pins 6 in the longitudinal direction of the crankshaft 4, the two cylinders 2 are also offset from one another in the same direction.
  • the crankshaft 4 carries a flywheel 10 at its output end and a gearwheel 11 for driving an intermediate shaft 12 and other units at the other end.
  • the intermediate shaft 12 is mounted parallel to the crankshaft 4 at a short distance above it in two bearings 13.
  • a ventilation rotary slide valve 15 for the controlled ventilation of the interior of the engine housing and a belt wheel 16 for a wedge or toothed belt drive 17 to a generator 18 are arranged on one end of the intermediate shaft 12.
  • the intermediate shaft 12 carries a drive gear or screw gear 19 approximately in the middle for a drive shaft of an ignition device, not shown, and possibly an oil pump, also not shown.
  • the intermediate shaft 12 In the two transverse planes 20 determined by the central axes of the cylinders 2, the intermediate shaft 12 carries a counterbalancing weight 21, which have extreme rotational positions facing and facing away from the crankshaft counterweights 9. In the area of the mutually facing rotational position positions of the counterweights 9 and 21, the two circular paths overlap them, so that a counterweight 21 engages between the assigned pair of crankshaft counterweights 9.
  • the intermediate shaft 12 also carries at one free end a pinion 22 for a chain drive 23 to a further intermediate shaft 24, which has a larger gear ratio 25 for the chain drive 23 and two further gear wheels 26 for a 1: 1 toothed belt drive 27 contributes to the cylinder heads 3.
  • the crankshaft 4 and both intermediate shafts 12 and 24 are mounted in a division plane 1 'of the engine housing 1, which is arranged in the vertical longitudinal center plane of the engine.
  • a further gear wheel 28 for the toothed belt drives 27 is fastened to a camshaft 29, which control the valves 30 in the cylinder heads 3.
  • an output clutch 110 is arranged on the intermediate shaft 112.
  • the proportion of the rotating masses of the crankshaft 4 is reduced and on the other hand the proportion of the masses rotating in the opposite direction to the crankshaft is increased by the output clutch.
  • the compensation of the counter torques in the event of speed changes is further increased in this way without additional construction work.

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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)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The engine of the opposed cylinder type, for fitting on motorcycles with the crankshaft (4) arranged in the direction of travel, includes an intermediate shaft (12) to compensate the mass moments caused by the two crankshaft drives (6, 7 and 8), offset in the direction of travel. The intermediate shaft is driven at the speed of the crankshaft (4) but in the opposite direction, lies in the drive connection to overhead camshafts (29) and bears compensating counterweights (21), the circular paths of which overlap with those of the crankshaft counterweights (9). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Zweizylinder-Viertakt-Brennkraftmaschine der Bauart gemäß dem Oberbegriff des Anspruches 1.The invention relates to a two-cylinder, four-stroke internal combustion engine of the type according to the preamble of claim 1.

Bekannte Brennkraftmaschinen dieser Bauart gemäß Z-DE "Das Motorrad", Heft 14/1974, S. 16 und Heft 24/1980, S. 28 und 30 sowie Z-DE "PS", Heft 2/1981, S. 5 bis 8 weisen einen sehr geringen Längsversatz der Zylinder auf, um die hieraus entstehenden Massendrehmomente um die Hochachse der Maschinen geringzuhalten. Dabei ist die Kurbelwelle entweder ohne Mittellager zwischen den beiden Kurbelzapfen einteilig oder mit Mittellager mehrteilig ausgebildet. Wegen der weitgehend in einer Drehrichtung drehenden Massen der Maschine tritt auch ein erhebliches Rückdrehmoment um die Längsachse der Maschine bei Drehzahländerungen auf.Known internal combustion engines of this type according to Z-DE "Das Motorrad", number 14/1974, page 16 and number 24/1980, pages 28 and 30 and Z-DE "PS", number 2/1981, pages 5 to 8 have a very low longitudinal misalignment of the cylinders in order to keep the resulting mass torques around the vertical axis of the machines low. The crankshaft is designed in one piece either without a central bearing between the two crank pins or in several parts with a central bearing. Because of the masses of the machine rotating largely in one direction of rotation, there is also a considerable reverse torque about the longitudinal axis of the machine when the speed changes.

Aufgabe der Erfindung ist es, die Massendrehmomente und Rückdrehmomente mittels einer Ausgleichsvorrichtung bei geringem zusätzlichen Bauaufwand und Raumbedarf zumindest weitgehend zu beseitigen.The object of the invention is to at least largely eliminate the mass torques and reverse torques by means of a compensating device with little additional construction effort and space requirements.

Diese Aufgabe wird durch die Merkmale des Kennzeichens des Anspruches 1 gelöst. Die zu der Kurbelwelle entgegengesetzt drehenden Ausgleichsgewichte der Zwischenwelle bewirken auch entgegengesetzte Massendrehmomente und Rückdrehmomente, so daß deren vollständiger Ausgleich möglich ist, der durch die Nutzung der vorhandenen Zwischenwelle und der ineinandergreifenden Gegengewichts-Kreisbahnen einen sehr geringen Kosten-, Gewichts- und Raumbedarf aufweist.This object is achieved by the features of the characterizing part of claim 1. The counterweights of the intermediate shaft rotating counter to the crankshaft also cause opposite mass torques and back Torques, so that their complete compensation is possible, which has a very low cost, weight and space requirement through the use of the existing intermediate shaft and the interlocking counterweight circular paths.

Die Merkmale der Ansprüche 2 und 3 bilden den Ausgleich der Rückdrehmomente weiter, in dem weitere drehende Maschinen- und Nebenaggregate ohne wesentlichen Zusatzaufwand hierfür genutzt werden. Dabei ergibt die Verwendung einer zusätzlichen weiteren Zwischenwelle gemäß Anspruch 2 den Vorteil einer räumlich günstigen Anordnung der 1 : 1-Ketten- oder -Zahnriementriebe zu den Nockenwellen mit raum- und gewichtssparenden Steuergehäuse und nockenwellenseitigen Steuerrädern, wodurch deren eigener Aufwand mehr als ausgeglichen wird.The features of claims 2 and 3 further develop the compensation of the reverse torques, in which further rotating machine and auxiliary units are used for this without any significant additional expenditure. The use of an additional intermediate shaft results in the advantage of a spatially favorable arrangement of the 1: 1 chain or toothed belt drives for the camshafts with space- and weight-saving control housings and camshaft-side control wheels, which more than compensates for their own effort.

In der Zeichnung ist ein Ausführungsbeispiel und eine Abwandlung desselben dargestellt. Es zeigen:

  • Fig. 1 einen Zweizylinder-Viertakt-Boxermotor für Motorräder im schematischen Mittellängsschnitt,
  • Fig. 2 eine Abwandlung des Boxermotors nach Fig. 1 mit Abtriebskupplung an der Zwischenwelle und
  • Fig. 3 die schematische Stirnansicht des Boxermotors nach den Fig. 1 und 2.
In the drawing, an embodiment and a modification of the same is shown. Show it:
  • 1 shows a two-cylinder four-stroke boxer engine for motorcycles in a schematic central longitudinal section,
  • Fig. 2 shows a modification of the boxer engine of FIG. 1 with an output clutch on the intermediate shaft and
  • 3 shows the schematic end view of the boxer engine according to FIGS. 1 and 2.

Ein Zweizylinder-Viertakt-Boxermotor für Motorräder weist gemäß Fig. 1 u. 3 ein Motorgehäuse 1, zwei einander gegenüberliegende Zylinder 2 und diesen zugeordnete Zylinderköpfe 3 auf. Im Gehäuse 1 ist eine Kurbelwelle 4 in drei Lagern 5 drehbar gelagert. Die Kurbelwelle 4 weist zwei Kurbelzapfen 6 auf, die um l80°-Kurbelwinkel gegeneinander verdreht angeordnet und je einem in den Zylindern 2 geführten Kolben 7 über Pleuel 8 zugeordnet sind. Den Kurbelzapfen 6 gegenüberliegend ist an der Kurbelwelle 4 je ein Paar Kurbelwellen-Gegengewichte 9 befestigt. Entsprechend dem Abstand der Kurbelzapfen 6 in Längsrichtung der Kurbelwelle 4 sind auch die beiden Zylinder 2 in gleicher Richtung gegeneinander versetzt. Die Kurbelwelle 4 trägt an ihrem abtriebsseitigen Ende ein Schwungrad 10 und am anderen Ende ein Zahnrad 11 zum Antrieb einer Zwischenwelle 12 und weiterer Aggregate. Die Zwischenwelle 12 ist parallel zur Kurbelwelle 4 in geringem Abstand über dieser in zwei Lagern 13 gelagert. Neben einem Zahnrad 14 für den Eingriff in das kurbelwellenseitige Zahnrad 11 sind auf dem einen Ende der Zwischenwelle 12 ein Entlüftungsdrehschieber 15 für die gesteuerte Entlüftung des Motorgehäuse-Inneren und ein Riemenrad 16 für einen Keil- oder Zahnriementrieb 17 zu einem Generator 18 angeordnet. Zwischen den Lagern 13 trägt die Zwischenwelle 12 etwa mittig ein Antriebszahnrad oder Schraubenzahnrad 19 für eine Antriebswelle einer nicht dargestellten Zünd-Vorrichtung und ggf. einer ebenfalls nicht dargestellten ölpumpe. In den beiden von den Mittelachsen der Zylinder 2 bestimmten Querebenen 20 trägt die Zwischenwelle 12 je ein Ausgleichs-Gegengewicht 21, die mit den Kurbelwellen-Gegengewichten 9 übereinstimmende, einander zu- und abgewandte Extremdrehlagen aufweisen. Im Bereich der einander zugewandten Drehlagenstellungen der Gegengewichte 9 und 21 überlappen sich die beiden Kreisbahnen derselben, so daß jeweils ein Ausgleichs-Gegengewicht 21 zwischen das zugeordnete Paar der Kurbelwellen-Gegengewichte 9 eingreift. Die Zwischenwelle 12 trägt ferner an einem freien Ende ein Zahnritzel 22 für einen Kettentrieb 23 zu einer weiteren Zwischenwelle 24, die ein zur 1 : 2-übersetzung größeres Zahnrad 25 für den Kettentrieb 23 und zwei weitere Zahnräder 26 für je einen 1 : 1-Zahnriementrieb 27 zu den Zylinderköpfen 3 trägt. Die Kurbelwelle 4 und beide Zwischenwellen 12 und 24 sind in einer Teilungsebene 1' des Motorgehäuses 1 gelagert, die in der senkrechten Längsmittelebene des Motors angeordnet ist.A two-cylinder four-stroke boxer engine for motorcycles has according to FIG. 1 u. 3 a motor housing 1, two mutually opposite cylinders 2 and cylinder heads 3 assigned to them. In the housing 1, a crankshaft 4 is rotatably supported in three bearings 5. The crankshaft 4 has two crank pins 6, which are arranged rotated relative to one another by 180 ° crank angle and are each assigned to a piston 7 guided in the cylinders 2 via connecting rods 8. The crank pin 6 on the opposite side, a pair of crankshaft counterweights 9 is fastened to the crankshaft 4. According to the distance between the crank pins 6 in the longitudinal direction of the crankshaft 4, the two cylinders 2 are also offset from one another in the same direction. The crankshaft 4 carries a flywheel 10 at its output end and a gearwheel 11 for driving an intermediate shaft 12 and other units at the other end. The intermediate shaft 12 is mounted parallel to the crankshaft 4 at a short distance above it in two bearings 13. In addition to a gearwheel 14 for engagement in the crankshaft-side gearwheel 11, a ventilation rotary slide valve 15 for the controlled ventilation of the interior of the engine housing and a belt wheel 16 for a wedge or toothed belt drive 17 to a generator 18 are arranged on one end of the intermediate shaft 12. Between the bearings 13, the intermediate shaft 12 carries a drive gear or screw gear 19 approximately in the middle for a drive shaft of an ignition device, not shown, and possibly an oil pump, also not shown. In the two transverse planes 20 determined by the central axes of the cylinders 2, the intermediate shaft 12 carries a counterbalancing weight 21, which have extreme rotational positions facing and facing away from the crankshaft counterweights 9. In the area of the mutually facing rotational position positions of the counterweights 9 and 21, the two circular paths overlap them, so that a counterweight 21 engages between the assigned pair of crankshaft counterweights 9. The intermediate shaft 12 also carries at one free end a pinion 22 for a chain drive 23 to a further intermediate shaft 24, which has a larger gear ratio 25 for the chain drive 23 and two further gear wheels 26 for a 1: 1 toothed belt drive 27 contributes to the cylinder heads 3. The crankshaft 4 and both intermediate shafts 12 and 24 are mounted in a division plane 1 'of the engine housing 1, which is arranged in the vertical longitudinal center plane of the engine.

An den Zylinderköpfen 3 ist je ein weiteres Zahnrad 28 für die Zahnriementriebe 27 an je einer Nockenwelle 29 befestigt, die die Ventile 30 in den Zylinderköpfen 3 steuern.On the cylinder heads 3, a further gear wheel 28 for the toothed belt drives 27 is fastened to a camshaft 29, which control the valves 30 in the cylinder heads 3.

Sowohl durch die enge Zuordnung der Kurbelwelle 4 und der Zwischenwelle 12 zueinander als auch durch die relativ kleinen Zahnräder 28 an den Nockenwellen 29 aufgrund der 1 : 1-Zahnriementriebe 27 weist der Gesamtaufbau des Motors einen geringen Raumbedarf auf. Die Gegengewichte auf der Zwischenwelle 12 gleichendie Massendrehmomente aus der Ausbildung der Kurbelwelle 4 aus und tragen zugleich aufgrund des Gegendrehsinnes zur Kurbelwelle 4 zusammen mit weiteren im gleichen Drehsinn angetriebenen Aggregaten, wie Generator 18, weitere Zwischenwelle 24 und Nockenwellen 19 sowie deren sämtliche Antriebs-Zahnräder 25, 26 und 28, zum Ausgleich des bei Drehzahländerungen auftretenden Gegendrehmomentes bei.Both due to the close association of the crankshaft 4 and the intermediate shaft 12 with one another and also due to the relatively small gear wheels 28 on the camshafts 29 due to the 1: 1 toothed belt drives 27, the overall structure of the engine requires little space. The counterweights on the intermediate shaft 12 equalize the mass torques from the design of the crankshaft 4 and, at the same time, due to the counter-rotation to the crankshaft 4, carry them together with other units driven in the same direction, such as generator 18, further intermediate shaft 24 and camshafts 19 and all of their drive gearwheels 25 , 26 and 28, to compensate for the counter torque occurring when the speed changes.

Bei der Abwandlung nach Fig. 2 ist eine Abtriebskupplung 110 an der Zwischenwelle 112 angeordnet. Dadurch ist zusätzlich zu der Ausbildung nach Fig. 1 einerseits der Anteil der drehenden Massen der Kurbelwelle 4 verringert und andererseits der Anteil der im Gegendrehsinn zur Kurbelwelle drehenden Massen um die Abtriebskupplung vergrößert. Der Ausgleich der Gegendrehmomente bei Drehzahländerungen ist auf diese Weise ohne zusätzlichen Bauaufwand weiter erhöht.In the modification according to FIG. 2, an output clutch 110 is arranged on the intermediate shaft 112. As a result, in addition to the embodiment according to FIG. 1, on the one hand the proportion of the rotating masses of the crankshaft 4 is reduced and on the other hand the proportion of the masses rotating in the opposite direction to the crankshaft is increased by the output clutch. The compensation of the counter torques in the event of speed changes is further increased in this way without additional construction work.

Claims (3)

1. Zweizylinder-Viertakt-Brennkraftmaschine, insbesondere für Motorräder mit in Fahrtrichtung angeordneter Kurbelwelle (4), - wobei die Zylinder (2) einander in Boxeranordnung gegenüberliegen und in Richtung der Kurbelwelle (4) längsversetzt sind, - die beiden Kurbelzapfen (6) der Kurbelwelle (4) um 180°-Kurbelwinkel gegeneinander verdreht sind und zugeordnete Kurbelwellen-Gegengewichte (9) aufweisen, sowie - eine Zwischenwelle (12) zur Kurbelwelle (4) parallel angeordnet und im Gegendrehsinn angetrieben ist, dadurch gekennzeichnet, - daß die Zwischenwelle (12) ein Übersetzungsverhältnis von 1 : 1 zur Kurbelwelle (4) aufweist, - daß zum Ausgleich der freien Massendrehmomente aus dem Versatz der Kurbelzapfen (6) Ausgleichs-Gegengewichte (21) auf der Zwischenwelle (12) in den von den Mittelachsen der Zylinder (2) bestimmten Querebenen (20) und mit in den jeweils einander zugewandten inneren und voneinander abgewandten äußeren Extrem-Drehlagen mit den Kurbelwellen-Gegengewichten (9) korrespondierend angeordnet sind, - wobei sich die Kreisbahnen der Ausgleichs-Gegengewichte (21) und die Kreisbahnen der Kurbelwellen-Gegengewichte (9) überlappen. 1. two-cylinder four-stroke internal combustion engine, in particular for motorcycles with a crankshaft (4) arranged in the direction of travel, - The cylinders (2) lie opposite one another in a boxer arrangement and are longitudinally offset in the direction of the crankshaft (4), - The two crank pins (6) of the crankshaft (4) are rotated against each other by 180 ° crank angle and have associated crankshaft counterweights (9), and an intermediate shaft (12) is arranged parallel to the crankshaft (4) and is driven in the opposite direction, characterized in that - That the intermediate shaft (12) has a transmission ratio of 1: 1 to the crankshaft (4), - That to compensate for the free mass torques from the offset of the crank pin (6) balancing counterweights (21) on the intermediate shaft (12) in the transverse planes (20) determined by the central axes of the cylinders (2) and with in the mutually facing inner and external extreme rotational positions facing away from one another are arranged corresponding to the crankshaft counterweights (9), - The circular paths of the counterweights (21) and the circular paths of the crankshaft counterweights (9) overlap. 2. Brennkraftmaschine nach Anspruch 1, - wobei je eine Antriebsverbindung von der Zwischenwelle (12) zu obenliegenden Nockenwellen (29) besteht, die in den den beiden Zylindern (2) zugeordneten Zylinderköpfen (3) angeordnet sind,
dadurch gekennzeichnet, - daß in der Antriebsverbindung zu den Nockenwellen (3) eine weitere zur Kurbelwelle (4) parallele Zwischenwelle (24) im Motorgehäuse (1) angeordnet ist, - die zur Kurbelwelle (4) einerseits gleichfalls entgegengesetzten Drehsinn und andererseits ein übersetzungsverhältnis von etwa 1 : 2 aufweist, und - daß die weitere Zwischenwelle (24) mittels je eines Ketten- oder Zahnriementriebes (27) die Nockenwellen (3) mit etwa 1 : 1-übersetzung und insgesamt 1 : 2- übersetzung gleichsinnig drehend antreibt.3. Brennkraftmaschine nach Anspruch 2, dadurch gekennzeichnet, - daß die Kurbelwelle (4) und beide Zwischenwellen (12 und 24) in einer quer zu den Mittelachsen der Zylinder (2) angeordneten Teilungsebene (1') des Motorgehäuses (1) gelagert sind. 2. Internal combustion engine according to claim 1, - Each having a drive connection from the intermediate shaft (12) to overhead camshafts (29) which are arranged in the cylinder heads (3) assigned to the two cylinders (2),
characterized, - That in the drive connection to the camshafts (3) a further intermediate shaft (24) parallel to the crankshaft (4) is arranged in the engine housing (1), - The crankshaft (4) on the one hand also opposite direction of rotation and on the other hand has a transmission ratio of about 1: 2, and - That the further intermediate shaft (24) by means of a chain or toothed belt drive (27) drives the camshafts (3) with about 1: 1 ratio and a total of 1: 2 ratio rotating in the same direction. 3. Internal combustion engine according to claim 2, characterized in - That the crankshaft (4) and both intermediate shafts (12 and 24) in a transverse to the central axes of the cylinders (2) arranged division plane (1 ') of the engine housing (1) are mounted. 4. Brennkraftmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß im wesentlichen alle weiteren drehenden Nebenaggregate, wie Abtriebskupplung (110), Generator (18), ölpumpe, Entlüftungsdrehschieber (15) und dgl., im zur Kurbelwelle (4) entgegengesetzten Drehsinn angetrieben sind.4. Internal combustion engine according to one of claims 1 to 3, characterized in that essentially all other rotating auxiliary units, such as output clutch (110), generator (18), oil pump, ventilation rotary valve (15) and the like. In the opposite to the crankshaft (4) Direction of rotation are driven.
EP84102133A 1983-03-04 1984-03-01 Two-cylinder four-stroke internal-combustion engine, in particular for motor-cycles with a crankshaft arranged in the direction of travel Withdrawn EP0121728A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833307708 DE3307708A1 (en) 1983-03-04 1983-03-04 TWO-CYLINDER FOUR-STOCK COMBUSTION ENGINE, ESPECIALLY FOR MOTORCYCLES WITH CRANKSHAFT ARRANGED IN THE DIRECTION
DE3307708 1983-03-04

Publications (2)

Publication Number Publication Date
EP0121728A2 true EP0121728A2 (en) 1984-10-17
EP0121728A3 EP0121728A3 (en) 1986-05-21

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EP84102133A Withdrawn EP0121728A3 (en) 1983-03-04 1984-03-01 Two-cylinder four-stroke internal-combustion engine, in particular for motor-cycles with a crankshaft arranged in the direction of travel

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EP (1) EP0121728A3 (en)
JP (1) JPS59170543A (en)
DE (1) DE3307708A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3541315A1 (en) * 1985-11-22 1987-05-27 Bayerische Motoren Werke Ag ARRANGEMENT OF SHAFTS AND UNITS IN MULTI-CYLINDER PISTON PISTON MACHINES WITH SEPARATE GAS EXCHANGE CONTROL DEVICES, IN PARTICULAR COMBUSTION ENGINES
FR2611806A1 (en) * 1987-03-02 1988-09-09 Allemand Alain Internal speed-reduction device for a four-stroke engine
DE4029710A1 (en) * 1989-09-19 1991-04-18 Honda Motor Co Ltd Large-engined motorcycle - has centrally mounted V-block with crankshaft in direction of travel
DE102018215118B3 (en) 2018-09-06 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Drive device, in particular in the manner of a boxer engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068336A1 (en) * 1981-06-26 1983-01-05 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Two-cylinder four-stroke boxer engine, particularly for a motor cyle, cooled by the oncoming air flux

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
JPS5131307A (en) * 1974-09-10 1976-03-17 Honda Motor Co Ltd Enjinniokeru hanryokumoomentoheikosochi
DE2713403C2 (en) * 1977-03-26 1984-04-19 Bayerische Motoren Werke AG, 8000 München Drive, in particular for motorcycles, the engines of which are installed with a longitudinal crankshaft

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068336A1 (en) * 1981-06-26 1983-01-05 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Two-cylinder four-stroke boxer engine, particularly for a motor cyle, cooled by the oncoming air flux

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MOTORRADZEITSCHRIFT "PS"; Nr. 2, 1981, Seiten 5-8; U. SCHWAB "Starke St}cke. Die getunten BMW-Motoren des Werner Fallert" *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3541315A1 (en) * 1985-11-22 1987-05-27 Bayerische Motoren Werke Ag ARRANGEMENT OF SHAFTS AND UNITS IN MULTI-CYLINDER PISTON PISTON MACHINES WITH SEPARATE GAS EXCHANGE CONTROL DEVICES, IN PARTICULAR COMBUSTION ENGINES
EP0223248A3 (en) * 1985-11-22 1987-09-16 Bayerische Motoren Werke Aktiengesellschaft Arrangement for axes and aggregates in multicylinder reciprocating-piston machines with separate gas exchange control, in particular internal-combustion engines
FR2611806A1 (en) * 1987-03-02 1988-09-09 Allemand Alain Internal speed-reduction device for a four-stroke engine
DE4029710A1 (en) * 1989-09-19 1991-04-18 Honda Motor Co Ltd Large-engined motorcycle - has centrally mounted V-block with crankshaft in direction of travel
DE4029710C2 (en) * 1989-09-19 1998-01-22 Honda Motor Co Ltd motorcycle
DE102018215118B3 (en) 2018-09-06 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Drive device, in particular in the manner of a boxer engine
DE102018215118B8 (en) * 2018-09-06 2020-10-29 Bayerische Motoren Werke Aktiengesellschaft Drive device, in particular in the manner of a boxer engine

Also Published As

Publication number Publication date
JPS59170543A (en) 1984-09-26
DE3307708A1 (en) 1984-09-06
EP0121728A3 (en) 1986-05-21

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