EP0154144B1 - Air-cooled internal-combustion piston engine - Google Patents

Air-cooled internal-combustion piston engine Download PDF

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Publication number
EP0154144B1
EP0154144B1 EP19850100754 EP85100754A EP0154144B1 EP 0154144 B1 EP0154144 B1 EP 0154144B1 EP 19850100754 EP19850100754 EP 19850100754 EP 85100754 A EP85100754 A EP 85100754A EP 0154144 B1 EP0154144 B1 EP 0154144B1
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EP
European Patent Office
Prior art keywords
cylinder
air
cooling
tubes
longitudinal axis
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
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EP19850100754
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German (de)
French (fr)
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EP0154144A2 (en
EP0154144A3 (en
Inventor
Werner Dr.-Ing. Haas
Dieter Hilker
Pavel Jan Slezak
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Khd Canada Inc Deutz R & D Division
Kloeckner Humboldt Deutz AG
Original Assignee
Khd Canada Inc Deutz R & D Division
Kloeckner Humboldt Deutz AG
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Priority to AT85100754T priority Critical patent/ATE51433T1/en
Publication of EP0154144A2 publication Critical patent/EP0154144A2/en
Publication of EP0154144A3 publication Critical patent/EP0154144A3/en
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Publication of EP0154144B1 publication Critical patent/EP0154144B1/en
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    • 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 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/04—Cylinders; Cylinder heads  having cooling means for air cooling
    • F02F1/06—Shape or arrangement of cooling fins; Finned cylinders
    • 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
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/28—Cylinder heads having cooling means for air cooling
    • F02F1/30—Finned cylinder heads
    • F02F1/34—Finned cylinder heads with means for directing or distributing cooling medium 

Definitions

  • the invention relates to an air-cooled reciprocating internal combustion engine according to the preamble of patent claim 1.
  • GB-A 200 938 and FR-A 874 201 both relate to air-cooled cylinder tubes which have different fin heights and GB-A 200 938 additionally has cooling fins arranged vertically in a cooling air supply area.
  • GB-A 200 938 additionally has cooling fins arranged vertically in a cooling air supply area.
  • the object of the invention is to optimize the cooling air flow in an air-cooled internal combustion engine with regard to cooling that is as uniform as possible, in particular of the cylinder tubes.
  • the cooling air is directed radially around the cylinder tubes by the cooling fins running transversely to the longitudinal axis of the cylinder tube, and in addition to the change in the cooling capacity caused by the inventive constant decrease in the rib height of the cooling ribs from the cylinder head-side cylinder tube section to the crankcase-side cylinder tube section, a change in the cooling capacity by the cooling air flowing radially around the cylinder tubes and directed specifically to different cylinder tube sections is reached.
  • due to the coincidence of the different (axial and radial) cooling air flows at the corresponding crossing points particularly intensive cooling is achieved by the cooling air flows which add up.
  • uniform cooling of the internal combustion engine is achieved overall.
  • valve stems of the intake and exhaust valves on the cooling air inflow or cooling air outflow side are arranged in such a way that the plane running through the valve stems is rotated at an acute angle to the longitudinal axis of the cylinder row
  • the circumferential region of the cylinder tubes on the cooling air inflow side is preferably free of cooling fins
  • the transverse to Cooling fins extending in the longitudinal axis of the cylinder tube are in a heat-conducting connection in the adjacent circumferential area, so that a constant heat flow of the cooling fins provided in the area of an exhaust valve of a cylinder to the cooling fins provided in the area of the inlet valve of the adjacent cylinder makes a contribution to the homogenization of the temperatures of also adjacent cylinder tubes in an advantageous manner Row of cylinders.
  • the manufacture (casting mold, mechanical processing methods, casting cores, etc.) is also far less complex, and the maintenance effort is also considerably simplified, e.g. B. due to simplified cleaning of significantly fewer fin surfaces.
  • the cooling fins are also arranged in areas that are easily accessible for cleaning even in reciprocating internal combustion engines with a V-shaped arrangement of the rows of cylinders.
  • the air control devices themselves are components that are easy to manufacture.
  • the air guiding devices are preferably designed in such a way that the cooling air, which is already heated on the circumferential areas of the cylinder tubes on the cylinder head side due to the higher temperature level prevailing there, can be discharged into the surroundings through outflow openings provided in the air guiding devices, so that only those from the crankcase-side cylinder tube sections flowing relatively cold cooling air is used to cool the rear hot cylinder tube areas.
  • higher cooling air velocities and thus higher cooling air mass flows can also be realized in the cylinder head circumferential regions.
  • the air-guiding devices on the cylinder head side in areas of the cylinder row and in the areas to be allocated in the interspaces of adjacent cylinder tubes have a cross-sectional structure that extends essentially up to close to the cooling air outflow-side end faces of cooling ribs running transversely to the longitudinal axis of the cylinder tube. This can be accomplished in a structurally simple manner, for example, by indentations, offsets, etc.
  • the cylinder heads in the area of the end of the cylinder tube on the cooling air outflow side are also provided with cooling fins aligned parallel to the longitudinal axis of the cylinder tube and with air baffles, so that the cooling air flow of the rear cylinder tube areas is provided by the special design of the air guide devices of the cylinder tubes and the air guide plates of the cylinder heads Outflow from the cooling fins of the cylinder tubes, which run parallel to the longitudinal axis of the cylinder tube, also for cooling the rear cylinder head region on the end of the cylinder tube, ie. H. essentially in the area of the outlet channel or outlet valve, can be used for cooling.
  • the air guiding plates in areas near the outlet duct can also contain additional cooling air outlet openings in order to have more intensive cooling achieved here through increased cooling air mass flows.
  • the advantages and effects of the invention ideally create the possibility for an air-cooled internal combustion engine to form the cylinder tubes and the crankcase in one piece, the cooling fins of adjacent cylinder tubes also extending transversely to the cylinder tube longitudinal axis one-piece training can be included, so that the crankcase and the cylinder tubes are easy to manufacture compact unit.
  • cylinder tubes are usually braced as special components with the crankcase via tie rods
  • significant savings in main machining steps can thus be achieved, so that, in addition to the functional advantages of the internal combustion engine according to the invention, overall production is also significantly reduced - and assembly effort and thus ultimately realize significant cost advantages.
  • the stability of the cylinder tubes and the crankshaft housing can also be strengthened, so that these are highly suitable, e.g. B. withstand higher torsional loads.
  • a circumferential reinforcing rib provided in the respective cylinder head end regions of the cylinder tubes can also contribute, as proposed in a further embodiment of the invention.
  • FIGS. 1 to 3 generally designates an air-cooled reciprocating piston internal combustion engine, which is provided with a crankcase 2, cylinder tubes 3 arranged next to one another and single cylinder heads 4.
  • the cylinder tubes 3 are formed in one piece with the crankshaft housing 2 and the outlet channels 5 of the individual cylinder heads 4 extend, as can be seen from FIGS. 1 and 2, on the cooling air outflow side.
  • the inlet duct which is not shown in detail, lies on the cooling air inflow side and opens into the area of the cooling air inflow side, the valves of the outlet and inlet ducts 5 and 6, which are not shown in detail, being arranged such that the planes running through the valve stems are at an acute angle (approx . 30 °) to the cylinder axis 7.
  • the cylinder tubes 3 In a cylinder tube section on the cylinder head side, the cylinder tubes 3 have cooling fins 9 running transversely to the cylinder tube longitudinal axes 8, these cooling fins 9 running transversely to the cylinder tube longitudinal axis 8, as can be seen from the various views according to FIGS. 1 to 3, only in a rear (downstream) side Circumferential region of the cylinder head section on the cylinder head side are provided.
  • the cylinder tubes 3 are thus formed without cooling ribs.
  • the cooling fins 11 running parallel to the longitudinal axis 8 of the cylinder tube and the cooling fins 9 of the cylinder tubes 3 of a row of cylinders 3 extending transversely to the longitudinal axis 8 of the cylinder tube are formed in one piece.
  • the air guiding device 13 On the cooling air outflow side of the cylinder tubes 3, the air guiding device 13 is provided, which on the last cylinder tubes 3 of the row of cylinders is kinked, so that the cylinder row on the side and on the outflow side is completely encased by the air guiding device with a sufficient flow distance 14 (FIG. 3).
  • the air guiding device 13 At the locations of the cylinder tubes 3 at which cooling fins 9 are provided which run transversely to the longitudinal axis 8 of the cylinder tube, the air guiding device 13 has a cross-sectional structure (indentations 15) on the cylinder head side that extends close to the downstream end faces of the cooling fins 9.
  • Outflow openings 16 are provided in these indentations 15, so that the cooling air (arrows 20a) flowing in these upper hot cylinder tube sections can flow directly into the surroundings.
  • the outflow openings 16 for cooling air flowing between the cylinder tubes are arranged asymmetrically to the central planes 21 of adjacent cylinder tubes 3, namely offset to the respective outlet channels 5, so that the peripheral regions of the cylinder tubes or their cooling fins 9 near the outlet channel are cooled more intensively than the opposite peripheral regions of the Cooling fins (inlet duct areas) of the neighboring cylinder tube.
  • the supplied cooling air is deflected after flowing through the respective non-ribbed front and side areas of the cylinder tubes 3 from the air guiding device 13 on the cooling air downstream side in the direction of the cooling fins 11 running parallel to the longitudinal axis 7 of the cylinder tube (arrows 20b), so that this total cooling air flow, which is a relatively low one Has temperature level, can be used to cool the rear hot cylinder tube area and is led through the parallel cooling fins 11 to the hottest area of the cylinder tubes 3 on the cylinder head side. Since the transverse cooling fins 11 are arranged at a distance from the crankshaft housing 2, it is ensured to a high degree that air accumulations, backflows, swirls etc. are avoided in the downstream flow space 14 of the air guiding device.
  • This design of the cooling air duct and the arrangement and design of the cooling fins 9 and 11 results in an optimal utilization of the total cooling air to be supplied and a substantial homogenization of the overall cylinder tube temperatures, so that this optimally fulfills the requirements for an increase in performance of the internal combustion engine and a reduction in temperature voltages given are.
  • the connection of the cooling fins 9 of adjacent cylinder tubes 3 running transversely to the longitudinal axis 8 of the cylinder tube ensures that a steady heat flow takes place from the hot peripheral region of a cylinder tube 3 (outlet channel 5) to the colder peripheral region (inlet channel 6) of the neighboring cylinder tube 3.
  • the cylinder heads 4 also have cooling fins 17 oriented parallel to the cylinder tube axis 8 at their end region on the cylinder tube side and are provided with air baffles 18 on the cooling air outflow side.
  • the air guiding device 13 and the air guiding plate 18, which also extends over the cylinder heads 4 of the entire cylinder row, are at a distance from one another on the outflow side and are bent at their edges by approximately 90 °, so that the cooling air of the cylinder tubes is arranged after flowing through the axis 8 parallel to the cylinder tube longitudinal axis
  • Cooling fins 11 is directed in the direction of the parallel oriented cooling fins 17 of the cylinder heads 4 and can flow together with the cooling air (arrows 20c) of the cylinder heads in this area into the environment (Fig. 3).
  • the cooling air of the cylinder tubes 3 also makes a contribution to cooling the hot end regions of the cylinder heads 4 on the end of the cylinder tubes 4.
  • the air baffles 18 of the cylinder heads 4 additionally have outlet openings 22, so that the cooling air can flow directly into the surroundings in regions of the outlet ducts 5.
  • the reciprocating piston internal combustion engine 1 Due to the one-piece design of the cylinder tubes 3, the crankshaft housing 2 and the cooling fins 9 and 11, the reciprocating piston internal combustion engine 1 according to the invention is designed as an overall unit with excellent stability properties that is simple to manufacture and therefore inexpensive to manufacture.
  • the stability structure of the cylinder tubes 3 in the region 12 on the end of the cylinder head can be improved by a reinforcing rib 19 extending over the entire circumference of the cylinder tubes 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressor (AREA)

Abstract

An air-cooled, reciprocating piston, internal combustion engine has at least two adjacent cylinder barrels with a plurality of cooling ribs lying substantially perpendicular to the longitudinal axes of the barrels on at least part of the periphery thereof. The intake ports of the cylinder heads are located on the cooling air inlet side while the exhaust ports are located on the cooling air outlet side, and an air deflection cover overlies the cylinder barrels on the cooling air outlet side. The cylinder barrels are provided on the cooling air outlet side with cooling ribs lying substantially parallel to the longitudinal axes of the cylinder barrels. The air deflecting cover is of a configuration such that at least some of the cooling air flowing, in the area adjoining the crankcase, around and between adjacent cylinder barrels, is deflected toward these parallel lying ribs, so that essentially the total flow of cooling air supplied may be used to cool the hottest area of a cylinder barrels.

Description

Die Erfindung bezieht sich auf eine luftgekühlte Hubkolbenbrennkraftmaschine gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to an air-cooled reciprocating internal combustion engine according to the preamble of patent claim 1.

Aus der gattungsgemäßen DE-C 705247 ist eine luftgekühlte Hubkolbenbrennkraftmaschine bekannt, die parallel und quer zur Zylinderrohrlängsachse verlaufende Kühlrippen aufweist. Dabei weisen die Kühlrippen aber konstante Rippenhöhen auf und sind parallel sowie quer zur Zylinderrohrlängsachse so zueinander angeordnet, daß die Kühlluft möglichst ungehindert durch die Zylinderreihe hindurchströmen kann. Durch diese Ausbildung ist aber die Kühlwirkung entlang der Strömungsrichtung der Kühlluft sehr unterschiedlich. eFrom the generic DE-C 705247 an air-cooled reciprocating internal combustion engine is known which has cooling fins running parallel and transverse to the longitudinal axis of the cylinder tube. However, the cooling fins have constant fin heights and are arranged parallel to one another and transversely to the longitudinal axis of the cylinder tube so that the cooling air can flow through the row of cylinders as freely as possible. With this design, however, the cooling effect along the flow direction of the cooling air is very different. e

Die GB-A 200 938 und FR-A 874 201 betreffen beide luftgekühlte Zylinderohre, die unterschiedliche Rippenhöhen aufweisen und wobei die GB-A 200 938 zusätzlich in einem Kühlluftzufuhrbereich senkrecht angeordnete Kühlrippen vorweist. Auch hier ergibt sich bei einer Umströmung der Zylinderrohre mit Kühlluft ein starker Temperaturunterschied entlang der Kühlluftführung.GB-A 200 938 and FR-A 874 201 both relate to air-cooled cylinder tubes which have different fin heights and GB-A 200 938 additionally has cooling fins arranged vertically in a cooling air supply area. Here, too, there is a strong temperature difference along the cooling air duct when cooling air flows around the cylinder tubes.

Der Erfindung liegt die Aufgabe zugrunde, die Kühlluftführung bei einer luftgekühlten Brennkraftmaschine bezüglich einer möglichst gleichmäßigen Kühlung, insbesondere der Zylinderrohre, zu optimieren.The object of the invention is to optimize the cooling air flow in an air-cooled internal combustion engine with regard to cooling that is as uniform as possible, in particular of the cylinder tubes.

Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst. Durch die erfindungsgemäße Ausgestaltung sind die Zylinderrohre in ihrem zylinderkopfseitigen Endbereich zunächst stärker als in ihrem kurbelgehäuseseitigen Endbereich gekühlt. Diese in Richtung der Zylinderrohrlängsachse sich ändernde Kühlleistung wird durch die kurbeigehäuseseitig und zylinderkopfseitig unterschiedlich beginnenden bzw. endenden parallel zur Zylinderrohrlängsachse verlaufenden Kühlrippen erreicht. Zudem wird durch die parallel zur Zylinderrohrlängsachse verlaufenden Kühlrippen der Kühlluftstrom gezielt auf bestimmte Bereiche der die Zylinderrohre abdeckenden Zylinderköpfe gelenkt. Durch die quer zur Zylinderrohrlängsachse verlaufenden Kühlrippen wird bekanntermaßen die Kühlluft radial um die Zylinderrohre herum gelenkt, wobei zusätzlich zu der durch die erfindungsgemäße konstante Abnahme der Rippenhöhe der Kühlrippen vom zylinderkopfseitigen Zylinderohrabschnitt hin zum kurbelgehäuseseitigen Zylinderrohrabschnitt bewirkte Änderung der Kühlleistung über die Zylinderohrhöhe eine Änderung der Kühlleistung durch die die Zylinderrohre radial umströmende und gezielt auf verschiedene Zylinderohrabschnitte gelenkte Kühlluft erreicht wird. Zudem wird durch das Zusammentreffen der unterschiedlichen (axialen und radialen) Kühlluftströme an den entsprechenden Kreuzungsstellen eine besonders intensive Kühlung durch die sich addierenden Kühlluftströme erreicht. Da aber die von der Verbrennung hervorgerufene Erwärmung der Zylinderohre und der Zylinderköpfe vom Kurbelgehäuse zum Zylinderkopf zunimmt, wird insgesamt eine gleichmäßige Kühlung der Brennkraftmaschine erreicht.This object is achieved in accordance with the characterizing features of patent claim 1. As a result of the configuration according to the invention, the cylinder tubes are initially cooled more strongly in their end region on the cylinder head side than in their end region on the crankcase side. This cooling capacity, which changes in the direction of the longitudinal axis of the cylinder tube, is achieved by the cooling fins which start or end differently and parallel to the longitudinal axis of the cylinder tube on the crankcase side and cylinder head side. In addition, the cooling air flow is directed to certain areas of the cylinder heads covering the cylinder tubes through the cooling fins running parallel to the longitudinal axis of the cylinder tube. As is known, the cooling air is directed radially around the cylinder tubes by the cooling fins running transversely to the longitudinal axis of the cylinder tube, and in addition to the change in the cooling capacity caused by the inventive constant decrease in the rib height of the cooling ribs from the cylinder head-side cylinder tube section to the crankcase-side cylinder tube section, a change in the cooling capacity by the cooling air flowing radially around the cylinder tubes and directed specifically to different cylinder tube sections is reached. In addition, due to the coincidence of the different (axial and radial) cooling air flows at the corresponding crossing points, particularly intensive cooling is achieved by the cooling air flows which add up. However, since the heating of the cylinder tubes and the cylinder heads caused by the combustion increases from the crankcase to the cylinder head, uniform cooling of the internal combustion engine is achieved overall.

Sind die Ventilschäfte der Einlaß- und Auslaßventile auf der Kühlluftzuström- bzw. Kühl luftabströmseite derart angeordnet, daß die durch die Ventilschäfte verlaufende Ebene in einem spitzen Winkel zur Zylinderreihenlängsachse verdreht angeordnet ist, ist der kühlluftzuströmseitige Umfangsbereich der Zylinderrohre bevorzugt kühlrippenfrei ausgebildet, wobei die quer zur Zylinderrohrlängsachse verlaufenden Kühlrippen im benachbarten Umfangsbereich in wärmeleitender Verbindung stehen, so daß ein stetiger Wärmefluß der im Bereich eines Auslaßventils eines Zylinders vorgesehenen Kühlrippen zu den im Bereich des Einlaßventils des benachbarten Zylinders vorgesehenen Kühlrippen in vor teilhafter Weise einen Beitrag zur Vergleichmäßigung der Temperaturen auch benachbarter Zylinderrohre einer Zylinderreihe leistet. Durch die erfindungsgemäße Anordnung und Gestaltung der Kühlrippen der Zylinderrohre gestaltet sich darüber hinaus die Fertigung (Gießform, mechanische Bearbeitungsverfahren, Gußkerne etc.) weit weniger aufwendig, und ferner ist der Wartungsaufwand erheblich erleichtert, z. B. aufgrund vereinfachter Reinigung von wesentlich weniger Kühlrippenoberflächen. Des weiteren sind die Kühlrippen auch noch in Bereichen angeordnet, die auch bei Hubkolbenbrennkraftmaschinen mit V-förmiger Anordnung der Zylinderreihen für eine Reinigung leicht zugänglich sind.If the valve stems of the intake and exhaust valves on the cooling air inflow or cooling air outflow side are arranged in such a way that the plane running through the valve stems is rotated at an acute angle to the longitudinal axis of the cylinder row, the circumferential region of the cylinder tubes on the cooling air inflow side is preferably free of cooling fins, the transverse to Cooling fins extending in the longitudinal axis of the cylinder tube are in a heat-conducting connection in the adjacent circumferential area, so that a constant heat flow of the cooling fins provided in the area of an exhaust valve of a cylinder to the cooling fins provided in the area of the inlet valve of the adjacent cylinder makes a contribution to the homogenization of the temperatures of also adjacent cylinder tubes in an advantageous manner Row of cylinders. Due to the arrangement and design of the cooling fins of the cylinder tubes according to the invention, the manufacture (casting mold, mechanical processing methods, casting cores, etc.) is also far less complex, and the maintenance effort is also considerably simplified, e.g. B. due to simplified cleaning of significantly fewer fin surfaces. Furthermore, the cooling fins are also arranged in areas that are easily accessible for cleaning even in reciprocating internal combustion engines with a V-shaped arrangement of the rows of cylinders.

Die Luftleiteinrichtungen selbst sind einfach herzustellende Bauteile. Bevorzugt sind die Luftleiteinrichtungen derart gestaltet sind, daß die Kühlluft, die an den zylinderkopfseitigen Umfangsbereichen der Zylinderrohre aufgrund des dort herrschenden höheren Temperaturniveaus bereits aufgeheizt ist, durch in den Luftleiteinrichtungen vorgesehene Abströmöffnungen in die Umgebung abgeführt werden kann, so daß nur die aus den kurbelgehäuseseitigen Zylinderrohrabschnitten strömende relativ kalte Kühlluft zur Kühlung der hinteren heißen Zylinderrohrbereiche herangezogen wird. Hierdurch lassen sich auch in den zylinderkopfseitigen Zylinderrohrumfangsbereichen höhere Kühlluftgeschwindigkeiten und somit höhere Kühlluftmassenströme realisieren. Um Verwirbelungen bei der durch die Abströmöffnungen abzuführenden Kühlluft weitgehend zu vermeiden, weisen die Luftleiteinrichtungen zylinderkopfseitig in Zylinderreihenendbereichen und in den Zwischenräumen benachbarter Zylinderrohre zuzuordnenden Bereichen eine im wesentlichen bis nahe an kühlluftabströmseitige Endflächen von quer zur Zylinderrohrlängsachse verlaufenden Kühlrippen reichende Querschnittsstruktur auf. Dies kann beispielsweise durch Einbuchtungen, Abkröpfungen etc. auf baulich einfache Weise bewerkstelligt werden. Die Weiterbildung der Erfindung nach Patentanspruch 6 fördert durch die zu den jeweiligen Auslaßventilen bzw. Auslaßkanälen versetzte Lage der Abströmöffnungen die Vergleichmäßigung der Zylinderrohrtemperaturen, indem in Auslaßkanalnähe höhere Luftgeschwindigkeiten erreicht werden als in Einlaßkanainähe.The air control devices themselves are components that are easy to manufacture. The air guiding devices are preferably designed in such a way that the cooling air, which is already heated on the circumferential areas of the cylinder tubes on the cylinder head side due to the higher temperature level prevailing there, can be discharged into the surroundings through outflow openings provided in the air guiding devices, so that only those from the crankcase-side cylinder tube sections flowing relatively cold cooling air is used to cool the rear hot cylinder tube areas. As a result, higher cooling air velocities and thus higher cooling air mass flows can also be realized in the cylinder head circumferential regions. In order to largely avoid turbulence in the cooling air to be discharged through the outflow openings, the air-guiding devices on the cylinder head side in areas of the cylinder row and in the areas to be allocated in the interspaces of adjacent cylinder tubes have a cross-sectional structure that extends essentially up to close to the cooling air outflow-side end faces of cooling ribs running transversely to the longitudinal axis of the cylinder tube. This can be accomplished in a structurally simple manner, for example, by indentations, offsets, etc. The development of the invention according to Patentan Say 6 promotes the equalization of the cylinder tube temperatures by the position of the outflow openings offset to the respective exhaust valves or exhaust ducts, by achieving higher air velocities near the exhaust duct than near the intake duct.

Entsprechend der Ausgestaltung der Erfindung nach Patentanspruch 7 sind auch die Zylinderköpfe im zylinderrohrendseitigen Bereich auf der Kühlluftabströmseite mit parallel zur Zylinderrohrlängsachse ausgerichteten Kühlrippen und mit Luftleitblechen versehen, so daß durch die besondere Gestaltung der Luftleiteinrichtungen der Zylinderrohre und der Luftleitbleche der Zylinderköpfe der Kühlluftstrom der hinteren Zylinderrohrbereiche nach Abströmen von den parallel zur Zylinderrohrlängsachse verlaufenden Kühlrippen der Zylinderrohre noch zur Kühlung des zylinderrohrendseitigen hinteren Zylinderkopfbereiches, d. h. also im wesentlichen im Bereich des Auslaßkanals bzw. Auslaßventils, zur Kühlung herangezogen werden kann. In analoger Weise wie die Luftleiteinrichtungen der Zylinderrohre können dabei auch die Luftleitbleche in Bereichen nahe des Auslaßkanals noch zusätzliche Kühlluftauslaßöffnungen enthalten, um hier eine intensivere Kühlung durch erhöhte Kühlluftmassenströme realisiert zu haben.In accordance with the embodiment of the invention according to claim 7, the cylinder heads in the area of the end of the cylinder tube on the cooling air outflow side are also provided with cooling fins aligned parallel to the longitudinal axis of the cylinder tube and with air baffles, so that the cooling air flow of the rear cylinder tube areas is provided by the special design of the air guide devices of the cylinder tubes and the air guide plates of the cylinder heads Outflow from the cooling fins of the cylinder tubes, which run parallel to the longitudinal axis of the cylinder tube, also for cooling the rear cylinder head region on the end of the cylinder tube, ie. H. essentially in the area of the outlet channel or outlet valve, can be used for cooling. In an analogous manner to the air guiding devices of the cylinder tubes, the air guiding plates in areas near the outlet duct can also contain additional cooling air outlet openings in order to have more intensive cooling achieved here through increased cooling air mass flows.

Durch die Vorteile und Wirkungen der Erfindung (verbesserte Kühlung, Vergleichmäßigung der Zylinderrohrtemperaturen, verringerter Fertigungsaufwand) ist in idealer Weise bei einer luftgekühlten Brennkraftmaschine die Möglichkeit geschaffen, die Zylinderrohre und das Kurbelgehäuse einstückig auszubilden, wobei auch die quer zur Zylinderrohrlängsachse verlaufenden Kühlrippen benachbarter Zylinderrohre in diese einstückige Ausbildung mit einbezogen sein können, so daß das Kurbelgehäuse und die Zylinderrohre sich als einfach herzustellende Kompakteinheit darstellen.The advantages and effects of the invention (improved cooling, equalization of the cylinder tube temperatures, reduced manufacturing costs) ideally create the possibility for an air-cooled internal combustion engine to form the cylinder tubes and the crankcase in one piece, the cooling fins of adjacent cylinder tubes also extending transversely to the cylinder tube longitudinal axis one-piece training can be included, so that the crankcase and the cylinder tubes are easy to manufacture compact unit.

Gegenüber bekannten luftgekühlten Brennkraftmaschinen, bei denen die Zylinderrohre üblicherweise als besondere Bauteile mit dem Kurbelgehäuse über Zuganker verspannt sind, sind somit wesentliche Einsparungen an Hauptbearbei- - tungsschritten zu erzielen, so daß sich neben den funktionellen Vorteilen der erfindungsgemäßen Brennkraftmaschine auch noch ein ingesamt weit verringerter Fertigungs- und Montageaufwand und somit letztlich erhebliche Kostenvorteile realisieren lassen. Durch die einstückige Ausbildung der Zylinderrohre mit dem Kurbelwellengehäuse und die Verbindung benachbarter Zylinder zueinander durch die quer zur Zylinderrohrlängsachse verlaufenden Kühlrippen läßt sich auch die Stabilität der Zylinderrohre und des Kurbelwellengehäuses verstärken, so daß diese in hohem Maße geeignet sind, z. B. höheren Torsionsbeanspruchungen standzuhalten. Zur weiteren Verbesserung dieser Stabilitätsstruktur kann darüber hinaus auch noch, wie in einer weiteren Ausgestaltung der Erfindung vorgeschlagen, eine in den jeweiligen Zylinderkopfendbereichen der Zylinderrohre vorgesehene umlaufende Verstärkungsrippe beitragen.Compared to known air-cooled internal combustion engines, in which the cylinder tubes are usually braced as special components with the crankcase via tie rods, significant savings in main machining steps can thus be achieved, so that, in addition to the functional advantages of the internal combustion engine according to the invention, overall production is also significantly reduced - and assembly effort and thus ultimately realize significant cost advantages. Due to the one-piece design of the cylinder tubes with the crankshaft housing and the connection of adjacent cylinders to each other through the cooling fins extending transversely to the longitudinal axis of the cylinder tube, the stability of the cylinder tubes and the crankshaft housing can also be strengthened, so that these are highly suitable, e.g. B. withstand higher torsional loads. To further improve this stability structure, a circumferential reinforcing rib provided in the respective cylinder head end regions of the cylinder tubes can also contribute, as proposed in a further embodiment of the invention.

Zur weiteren Erläuterung der Erfindung wird auf die Zeichnungen verwiesen, in denen ein Ausführungsbeispiel der Erfindung vereinfacht dargestellt ist. Es zeigen :

  • Fig. 1 eine Ansicht einer Zylinderreihe eines Ausführungsbeispiels der Brennkraftmaschine von der Kühlluftabströmseite ;
  • Fig. 2 einen Schnitt durch zwei Zylinderrohre und zwei Zylinderköpfe der Zylinderreihe entsprechend der Linie 11-11 in Fig. 1 ;
  • Fig. 3 eine Seitenansicht eines Zylinderrohres mit montiertem Zylinderkopf und angebauten Luftleiteinrichtungen bzw. Luftleitblechen gemäß Fig. 1.
To further explain the invention, reference is made to the drawings, in which an embodiment of the invention is shown in simplified form. Show it :
  • 1 is a view of a row of cylinders of an embodiment of the internal combustion engine from the cooling air outflow side;
  • Figure 2 is a section through two cylinder tubes and two cylinder heads of the cylinder bank according to the line 11-11 in Fig. 1.
  • 3 shows a side view of a cylinder tube with a mounted cylinder head and attached air guide devices or air guide plates according to FIG. 1.

Soweit im einzelnen dargestellt, sind in den Fig. 1 bis 3 grundsätzlich gleichwirkende Teile mit gleichen Bezugsziffern versehen. Mit 1 ist allgemein eine luftgekühlte Hubkolbenbrennkraftmaschine bezeichnet, die mit einem Kurbelgehäuse 2, nebeneinander angeordneten Zylinderrohren 3 und Einzelzylinderköpfen 4 versehen ist. Die Zylinderrohre 3 sind einstückig mit dem Kurbelwellengehäuse 2 ausgebildet und die Auslaßkanäle 5 der Einzelzylinderköpfe 4 erstrecken sich, wie aus Fig. 1 und 2 ersichtlich, auf der Kühlluftabströmseite. Der im einzelnen nicht näher dargestellte Einlaßkanal liegt auf der Kühlluftzuströmseite und mündet im Bereich der Kühlluftzuströmseite, wobei die nicht im einzelnen dargestellten Ventile der Aus- und Einlaßkanäle 5 und 6 derart angeordnet sind, daß die durch die Ventilschäfte verlaufende Ebenen in einem spitzen Winkel (ca. 30°) zur Zylinderreihenlängsachse 7 verlaufen.As far as shown in detail, parts with the same effect are given the same reference numbers in FIGS. 1 to 3. 1 generally designates an air-cooled reciprocating piston internal combustion engine, which is provided with a crankcase 2, cylinder tubes 3 arranged next to one another and single cylinder heads 4. The cylinder tubes 3 are formed in one piece with the crankshaft housing 2 and the outlet channels 5 of the individual cylinder heads 4 extend, as can be seen from FIGS. 1 and 2, on the cooling air outflow side. The inlet duct, which is not shown in detail, lies on the cooling air inflow side and opens into the area of the cooling air inflow side, the valves of the outlet and inlet ducts 5 and 6, which are not shown in detail, being arranged such that the planes running through the valve stems are at an acute angle (approx . 30 °) to the cylinder axis 7.

Die Zylinderrohre 3 weisen in einem zylinderkopfseitigen Zylinderrohrabschnitt quer zu den Zylinderrohrlängsachsen 8 verlaufende Kühlrippen 9 auf, wobei diese quer zur Zylinderrohrlängsachse 8 verlaufenden Kühlrippen 9, wie aus den verschiedenen Ansichten nach den Fig. 1 bis 3 hervorgeht, ausschließlich in einem hinteren (abströmseitigen) seitlichen Umfangsbereich des zylinderkopfseitigen Zylinderrohrabschnittes vorgesehen sind. Auf der durch die durchgezogenen Pfeile 10 in den Fig. 2 und 3 angedeuteten Kühlluftzuströmseite und auch in dem kurbelgehäuseseitigen Zylinderrohrabschnitt auf der Kühlluftabströmseite sind somit die Zylinderrohre 3 kühlrippenfrei ausgebildet.In a cylinder tube section on the cylinder head side, the cylinder tubes 3 have cooling fins 9 running transversely to the cylinder tube longitudinal axes 8, these cooling fins 9 running transversely to the cylinder tube longitudinal axis 8, as can be seen from the various views according to FIGS. 1 to 3, only in a rear (downstream) side Circumferential region of the cylinder head section on the cylinder head side are provided. On the cooling air inflow side indicated by the solid arrows 10 in FIGS. 2 and 3 and also in the crankcase-side cylinder tube section on the cooling air outflow side, the cylinder tubes 3 are thus formed without cooling ribs.

Auf der Kühlluftabströmseite (Pfeile 20a, 20b) der Zylinderrohre 3 sind erfindungsgemäß die im wesentlichen parallel zur Zylinderrohrlängsachse 8 verlaufenden Kühlrippen 11 angeordnet, die im wesentlichen bis zu den zylinderkopfendseitigen Endflächen 12 der Zylinderrohre 3 reichen und mit einem axialen Abstand zum Kurbelwellengehäuse 2 an den Zylinderrohren 3 vorgesehen sind. Die parallel zur Zylinderrohrlängsachse 8 verlaufenden Kühlrippen 11 und die quer zur Zylinderrohrlängsachse 8 verlaufenden Kühlrippen 9 der Zylinderrohre 3 einer Zylinderreihe sind insgesamt einstückig ausgebildet.On the cooling air outflow side (arrows 20a, 20b) of the cylinder tubes 3, the cooling fins 11, which run essentially parallel to the longitudinal axis 8 of the cylinder barrel, are arranged, which extend essentially to the end faces 12 of the cylinder tubes 3 on the end side of the cylinder head and at an axial distance from the crankcase 2 on the cylinder tubes 3 are provided. The cooling fins 11 running parallel to the longitudinal axis 8 of the cylinder tube and the cooling fins 9 of the cylinder tubes 3 of a row of cylinders 3 extending transversely to the longitudinal axis 8 of the cylinder tube are formed in one piece.

Auf der Kühlluftabströmseite der Zylinderrohre 3 ist die Luftleiteinrichtung 13 vorgesehen, die an den letzten Zylinderrohren 3 der Zylinderreihe abgeknickt ist, so daß die Zylinderreihe seitlich und abströmseitig vollständig von der Luftleiteinrichtung mit einem ausreichenden Durchströmabstand 14 (Fig. 3) ummantelt wird. An den Stellen der Zylinderrohre 3, an denen quer zur Zylinderrohrlängsachse 8 verlaufende Kühlrippen 9 vorgesehen sind, weist die Luftleiteinrichtung 13 zylinderkopfseitig eine bis nahe an abströmseitige Endflächen der Kühlrippen 9 reichende Querschnittsstruktur (Einbuchtungen 15) auf. In diesen Einbuchtungen 15 sind Abströmöffnungen 16 vorgesehen, so daß die in diesen oberen heißen Zylinderrohrabschnitten strömende Kühlluft (Pfeile 20a) unmittelbar in die Umgebung abströmen kann. Die Abströmöffnungen 16 für zwischen den Zylinderrohren strömende Kühlluft sind dabei asymmetrisch zu den Mittelebenen 21 benachbarter Zylinderrohre 3 angeordnet, und zwar versetzt zu den jeweiligen Auslaßkanälen 5, so daß die auslaßkanalnahen Umfangsbereiche der Zylinderrohre bzw. deren Kühlrippen 9 intensiver gekühlt werden als die gegenüberliegenden Umfangsbereiche der Kühlrippen (Einlaßkanalbereiche) des Nachbarzylinderrohres.On the cooling air outflow side of the cylinder tubes 3, the air guiding device 13 is provided, which on the last cylinder tubes 3 of the row of cylinders is kinked, so that the cylinder row on the side and on the outflow side is completely encased by the air guiding device with a sufficient flow distance 14 (FIG. 3). At the locations of the cylinder tubes 3 at which cooling fins 9 are provided which run transversely to the longitudinal axis 8 of the cylinder tube, the air guiding device 13 has a cross-sectional structure (indentations 15) on the cylinder head side that extends close to the downstream end faces of the cooling fins 9. Outflow openings 16 are provided in these indentations 15, so that the cooling air (arrows 20a) flowing in these upper hot cylinder tube sections can flow directly into the surroundings. The outflow openings 16 for cooling air flowing between the cylinder tubes are arranged asymmetrically to the central planes 21 of adjacent cylinder tubes 3, namely offset to the respective outlet channels 5, so that the peripheral regions of the cylinder tubes or their cooling fins 9 near the outlet channel are cooled more intensively than the opposite peripheral regions of the Cooling fins (inlet duct areas) of the neighboring cylinder tube.

Ansonsten wird die zugeführte Kühlluft nach Durchströmen der jeweils unverrippten vorderen und seitlichen Bereiche der Zylinderrohre 3 von der Luftleiteinrichtung 13 auf der Kühlluftabströmseite in Richtung der parallel zur Zylinderrohrlängsachse 7 verlaufenden Kühlrippen 11 umgelenkt (Pfeile 20b), so daß dieser gesamte Kühlluftstrom, der ein relativ niedriges Temperaturniveau aufweist, zur Kühlung des hinteren heißen Zyiinderrohrbereiches herangezogen werden kann und durch die parallel verlaufenden Kühlrippen 11 zum heißesten zylinderkopfseitigen Bereich der Zylinderrohre 3 geführt wird. Da die quer verlaufenden Kühlrippen 11 mit einem Abstand zum Kurbelwellengehäuse 2 angeordnet sind, ist dabei in hohem Maße gewährleistet, daß in dem abströmseitigen Durchströmraum 14 der Luftleiteinrichtung 13 Luftansammlungen, Rückströmungen, Verwirbelungen etc. vermieden werden.Otherwise, the supplied cooling air is deflected after flowing through the respective non-ribbed front and side areas of the cylinder tubes 3 from the air guiding device 13 on the cooling air downstream side in the direction of the cooling fins 11 running parallel to the longitudinal axis 7 of the cylinder tube (arrows 20b), so that this total cooling air flow, which is a relatively low one Has temperature level, can be used to cool the rear hot cylinder tube area and is led through the parallel cooling fins 11 to the hottest area of the cylinder tubes 3 on the cylinder head side. Since the transverse cooling fins 11 are arranged at a distance from the crankshaft housing 2, it is ensured to a high degree that air accumulations, backflows, swirls etc. are avoided in the downstream flow space 14 of the air guiding device.

Durch diese Gestaltung der Kühlluftführung und durch die Anordnung und Gestaltung der Kühlrippen 9 und 11 ergibt sich eine optimale Ausnutzung der insgesamt zuzuführenden Kühlluft und eine wesentliche Vergleichmäßigung der Gesamtzylinderrohrtemperaturen, so daß hierdurch in optimaler Weise die Voraussetzungen für eine Leistungserhöhung der Brennkraftmaschine und die Herabsetzung von Temperaturspannungen gegeben sind. Durch die Verbindung der quer zur Zylinderrohrlängsachse 8 verlaufenden Kühlrippen 9 benachbarter Zylinderrohre 3 ist dafür Sorge getragen, daß ein stetiger Wärmefluß vom heißen Umfangsbereich eines Zylinderrohrs 3 (Auslaßkanal 5) zu dem kälteren Umfangsbereich (Einlaßkanal 6) des Nachbarzylinderrohrs 3 stattfindet.This design of the cooling air duct and the arrangement and design of the cooling fins 9 and 11 results in an optimal utilization of the total cooling air to be supplied and a substantial homogenization of the overall cylinder tube temperatures, so that this optimally fulfills the requirements for an increase in performance of the internal combustion engine and a reduction in temperature voltages given are. The connection of the cooling fins 9 of adjacent cylinder tubes 3 running transversely to the longitudinal axis 8 of the cylinder tube ensures that a steady heat flow takes place from the hot peripheral region of a cylinder tube 3 (outlet channel 5) to the colder peripheral region (inlet channel 6) of the neighboring cylinder tube 3.

Die Zylinderköpfe 4 weisen an ihrem zylinderrohrseitigen Endbereich ebenfalls parallel zur Zylinderrohrachse 8 ausgerichtete Kühlrippen 17 auf und sind auf der Kühlluftabströmseite mit Luftleitblechen 18 versehen. Die Luftleiteinrichtung 13 und das sich ebenfalls über die Zylinderköpfe 4 der gesamten Zylinderreihe erstreckende Luftleitblech 18 weisen auf der Abströmseite zueinander einen Abstand auf und sind an ihren Rändern um etwa 90° umgebogen, so daß die Kühlluft der Zylinderrohre nach Durchströmen der parallel zur Zylinderrohrlängsachse 8 angeordneten Kühlrippen 11 in Richtung der parallel ausgerichteten Kühlrippen 17 der Zylinderköpfe 4 gelenkt wird und gemeinsam mit der Kühlluft (Pfeile 20c) der Zylinderköpfe in diesem Bereich in die Umgebung abströmen kann (Fig. 3). Somit leistet die Kühlluft der Zylinderrohre 3 auch noch einen Beitrag zur Kühlung der zylinderrohrendseitigen heißen Endbereiche der Zylinderköpfe 4. Die Luftleitbleche 18 der Zylinderköpfe 4 weisen zusätzlich noch Auslaßöffnungen 22 auf, so daß in Bereichen der Auslaßkanäle 5 die Kühlluft direkt in die Umgebung abströmen kann.The cylinder heads 4 also have cooling fins 17 oriented parallel to the cylinder tube axis 8 at their end region on the cylinder tube side and are provided with air baffles 18 on the cooling air outflow side. The air guiding device 13 and the air guiding plate 18, which also extends over the cylinder heads 4 of the entire cylinder row, are at a distance from one another on the outflow side and are bent at their edges by approximately 90 °, so that the cooling air of the cylinder tubes is arranged after flowing through the axis 8 parallel to the cylinder tube longitudinal axis Cooling fins 11 is directed in the direction of the parallel oriented cooling fins 17 of the cylinder heads 4 and can flow together with the cooling air (arrows 20c) of the cylinder heads in this area into the environment (Fig. 3). Thus, the cooling air of the cylinder tubes 3 also makes a contribution to cooling the hot end regions of the cylinder heads 4 on the end of the cylinder tubes 4. The air baffles 18 of the cylinder heads 4 additionally have outlet openings 22, so that the cooling air can flow directly into the surroundings in regions of the outlet ducts 5.

Durch die einstückige Ausbildung der Zylinderrohre 3, des Kurbelwellengehäuses 2 und der Kühlrippen 9 und 11 gestaltet sich die erfindungsgemäße Hubkolbenbrennkraftmaschine 1 als auf fertigungstechnisch einfache und somit kostengünstige Weise herzustellende Gesamteinheit mit hervorragenden Stabilitätseigenschaften. Die Stabilitätsstruktur der Zylinderrohre 3 im zylinderkopfendseitigen Bereich 12 kann durch eine sich über den gesamten Umfang der Zylinderrohre 3 erstreckende Verstärkungsrippe 19 verbessert werden.Due to the one-piece design of the cylinder tubes 3, the crankshaft housing 2 and the cooling fins 9 and 11, the reciprocating piston internal combustion engine 1 according to the invention is designed as an overall unit with excellent stability properties that is simple to manufacture and therefore inexpensive to manufacture. The stability structure of the cylinder tubes 3 in the region 12 on the end of the cylinder head can be improved by a reinforcing rib 19 extending over the entire circumference of the cylinder tubes 3.

Claims (10)

1. An air-cooled reciprocating-piston internal combustion engine (1) having two or more cylinder tubes (3) arranged side by side on a crank-case (2), which comprise, at least on a part circumference, cooling fins (9) extending substantially transversely of the longitudinal axis (8) of the cylinder tubes and are provided on their cooling air outflow side (20) with cooling fins (11) and air guide devices (13) extending substantially parallel to the cylinder tube longitudinal axis (8), while by means of the air guide devices (13) at least a part of the cooling air flowing laterally around the cylinder tubes (3) and/or between adjacent cylinder tubes (3) can be deflected in the direction of the cooling fins (11) extending parallel to the cylinder tube longitudinal axis (8), the cylinder tubes (3) being covered by cylinder heads (4) the inlet passages (6) of which open preferably on the cooling air inflow side (10) and the outlet passages (5) of which open preferably on the cooling air outflow side (20), characterised in that the cooling fins (11), extending parallel to the cylinder tube longitudinal axis (8) and each in one piece, reach substantially as far as the end faces (12) on the cylinder head side of the cylinder tubes (3) and begin with an axial spacing from the crank-case (2) at the cylinder tubes (3), in that the cooling fins (9) extending transversely of the cylinder tube longitudinal axis (8) comprise a smaller fin height in a cylinder tube section on the crank-case side than in a cylinder tube section on the cylinder head side, while in the direction of the crank-case (2) the fin height decreases substantially constantly and in that the cylinder tubes (3) are made free from cooling fins in a circumferential region on the cooling air inflow side (10).
2. An air-cooled internal combustion engine according to Claim 1, characterised in that the plane extending through the valve stems of the inlet and outlet valve is arranged to turn at an acute angle to the cylinder row longitudinal axis (7).
3. An air-cooled internal combustion engine according to any one of the preceding Claims, characterised in that the cooling fins (9) extending transversely of the cylinder tube longitudinal axis (8) are in thermally-conductive connection in adjacent circumferential zones.
4. An air-cooled internal combustion engine according to any one of the preceding Claims, characterised in that the cooling fins (9), extending transversely of the cylinder tube longitudinal axis (8), of adjacent cylinder tubes (3) are made in one piece.
5. An air-cooled internal combustion engine according to any one of the preceding Claims, characterised in that the air-guide devices (13) comprise, on the cylinder head side, in cylinder row end regions and between adjacent cylinder tubes (6), a cross-sectional structure (15) reaching substantially close to end faces, on the cooling air departure side, of cooling fins (9) extending transversely of the cylinder tube longitudinal axis (8).
6. An air-cooled internal combustion engine according to Claim 5, characterised in that the outflow openings (16) for cooling air flowing between adjacent cylinder tubes (3) are provided asymmetrically of central planes (21), arranged perpendicularly of the cylinder row longitudinal axis (7), of adjacent cylinder tubes and staggered in the direction of the respective outlet passages.
7. An air-cooled internal combustion engine according to any one of the preceding Claims, characterised in that the cylinder heads (4) are provided on the cooling air outflow side (20) with cooling fins (17) arranged in the end zone on the cylinder tube side and oriented parallel to the cylinder tube longitudinal axis (8), and with air guide plates (18), in that the air guide devices (13) of the cylinder tubes (3) are bent on the cylinder head end and the air guide plates (18) of the cylinder heads (4) are angled on the cylinder tube end at their edges through about 90°, in that the air guide devices (13) and the air guide plates (18) have a spacing from one another at least in the region of the cooling fins (11), extending parallel to the cylinder tube longitudinal axis (8), of the cylinder tubes (3), and in that the air guide devices (13) of the cylinder tubes (3) reach close to the cooling fins (17), extending parallel to the cylinder tube longitudinal axis (8), of the cylinder heads (4).
8. An air-cooled internal combustion engine according to any one of the preceding Claims, characterised in that the cylinder tubes (3) and the crank-case (2) are made in one piece.
9. An air-cooled internal combustion engine according to any one of the preceding Claims, characterised in that a reinforcing rib (19) is provided substantially on the end region (12) on the cylinder head side of the cylinder tubes (3).
10. An air-cooled internal combustion engine according to Claim 7, characterised in that the air guide plates (18) of the cylinder heads (4) have cooling air outlet openings (22) in the region of the outlet passages (5).
EP19850100754 1984-03-09 1985-01-25 Air-cooled internal-combustion piston engine Expired - Lifetime EP0154144B1 (en)

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DE3408624 1984-03-09
DE19843408624 DE3408624A1 (en) 1984-03-09 1984-03-09 AIR COOLED PISTON COMBUSTION ENGINE

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EP0154144A3 EP0154144A3 (en) 1986-08-27
EP0154144B1 true EP0154144B1 (en) 1990-03-28

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DE6906207U (en) * 1968-08-15 1969-07-10 Tovarna Motornih Vozil T O M O CYLINDER WITH SEPARATE CYLINDER HEAD
US4047508A (en) * 1975-12-08 1977-09-13 Avco Corporation Cooling air distribution system for reciprocating aircraft engines
AT365743B (en) * 1977-06-07 1982-02-10 List Hans CYLINDER HEAD FOR AN AIR COOLED INTERNAL COMBUSTION ENGINE
DE2921925A1 (en) * 1979-05-30 1981-03-12 Klöckner-Humboldt-Deutz AG, 5000 Köln Air cooled IC engine - has cooling air guide plates to direct air flow close to cylinder fins
US4515111A (en) * 1984-04-19 1985-05-07 Khd Canada Inc. Air-cooled, reciprocating piston, internal combustion engine with cylinder heads forming arcuate or S-shaped cooling ducts therebetween

Also Published As

Publication number Publication date
EP0154144A2 (en) 1985-09-11
DE3576842D1 (en) 1990-05-03
US4633823A (en) 1987-01-06
ATE51433T1 (en) 1990-04-15
DE3408624A1 (en) 1985-09-12
CA1238540A (en) 1988-06-28
EP0154144A3 (en) 1986-08-27

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