WO2017084975A1 - Moteur bicylindre à plat à refroidissement par air - Google Patents

Moteur bicylindre à plat à refroidissement par air Download PDF

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Publication number
WO2017084975A1
WO2017084975A1 PCT/EP2016/077423 EP2016077423W WO2017084975A1 WO 2017084975 A1 WO2017084975 A1 WO 2017084975A1 EP 2016077423 W EP2016077423 W EP 2016077423W WO 2017084975 A1 WO2017084975 A1 WO 2017084975A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
piston
cooled
air
boxer engine
Prior art date
Application number
PCT/EP2016/077423
Other languages
German (de)
English (en)
Inventor
Dirk Scheffer
Original Assignee
Dirk Scheffer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dirk Scheffer filed Critical Dirk Scheffer
Publication of WO2017084975A1 publication Critical patent/WO2017084975A1/fr

Links

Classifications

    • 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
    • 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
    • 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
    • F02F3/00—Pistons 
    • 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
    • F02F3/00—Pistons 
    • F02F3/28—Other pistons with specially-shaped head

Definitions

  • the invention relates to an air-cooled two-cylinder boxer engine with a crankcase, a crank mechanism, two cylinders, two cylinder heads, a lower camshaft and two valves per cylinder, wherein the cylinder head adjacent to the cylinder has a cylindrical inlet portion. Moreover, the invention relates to piston, cylinder and connecting rod for such a two-cylinder air-cooled boxer engine.
  • Air-cooled two-cylinder boxer engines have been used in the past
  • BMW R 100 motorcycles, in particular under the brand name BMW R 100, BMW R 80 in various versions, in some cases also in motorcycle trailers, brought into circulation.
  • the BMW R 100 models have a standard bore of 94 mm and a stroke of 70.6 mm, making for
  • Cylinder heads or camshafts include. These comparatively complex measures cause high costs.
  • the standard two-cylinder boxer engines have in the cylinder head adjacent to the cylinder on a cylindrical input portion.
  • the dome of the cylinder head is formed adjacent to the sealing surface of a cylindrical inlet portion, which subsequently in a roof-shaped area merges, in which also the inlet and the outlet channel open.
  • this input section has a diameter of approx. 95.5 mm and a height of approx. 2 mm.
  • the present invention is based on the object, the per se known air-cooled two-cylinder boxer engines by conversion measures in such a way that with little effort and thus cost significantly increased performance is guaranteed. According to the invention this is achieved in that the upper edge of the top land of the piston at top dead center in the
  • Entrance portion of the cylinder head protrudes.
  • This measure according to the invention and associated with this immersion of the piston in the calotte of the cylinder head a significantly increased compression is achieved.
  • the invention makes use of the fact that the standard cylinder heads of the air-cooled two-cylinder boxer engines in question allow a plunging of the piston into the calotte of the cylinder head without a costly revision of the cylinder head.
  • the height of the cylinder head gasket is also to be added to the input section of the cylinder head. Under the flank of the piston is meant the portion of the piston skirt between the top of the piston skirt bounded above by the piston crown and the notch for the first piston ring of the piston as viewed from above.
  • Two-cylinder boxer engine characterized in that the upper edge of the top land of the piston at top dead center from the cylinder into the inlet portion of the cylinder head at least 2 mm, preferably 3 mm protrudes.
  • the aforementioned inlet portion of the cylinder head dome in conjunction with the thickness of the cylinder head gasket generates an additional stroke of up to approximately 3.5 mm which is free for the piston.
  • the invention also relates to a piston for an inventive
  • top land at least 2.5 mm, preferably at least 3.5 mm, on
  • This embodiment of the land of a piston according to the invention ensures that the first piston ring is securely guided out of the cylinder despite the emergence of the upper edge of the land.
  • a piston for an air-cooled two-cylinder boxer engine according to the invention is further advantageously configured in that the piston has a different compression height from the standard height.
  • Compression height ie the distance between the center of the piston pin and the upper edge of the top land, alone or in combination with other measures, the inventive emergence of the upper edge of the top land can be ensured from the cylinder.
  • Combustion space on the outer circumference thereof is ensured by the fact that the piston crown of the piston in a first annular region adjacent to the upper edge of the top land has an inclination of 18 °.
  • the inclination in the first ring portion is adapted to the inclination of the dome of the cylinder head adjacent to the mentioned entry portion, which is also about 18 °.
  • the piston head and the cap of the cylinder head limit this squish surface of the combustion chamber in parallel, which leads to an improvement of the combustion processes in the combustion chamber, resulting in a further increase in performance.
  • a piston for an air-cooled two-cylinder boxer engine according to the invention undergoes a particularly advantageous embodiment in that the diameter of the piston in the region of the top land is adapted to the diameter of the inlet portion of the cylinder head.
  • Such a piston allows optimum utilization of the existing diameter of the inlet portion of the dome of the cylinder head, e.g. of 95.5 mm.
  • the diameter of the piston in the region of the top land is less than e.g. at the middle height of the piston skirt. This will be the
  • a cylinder for such an air-cooled two-cylinder boxer engine is advantageously configured in that the cylinder is connected to the diameter of the input section of the
  • Cylinder head adapted bore has. This hole allows a
  • inventive design of an air-cooled two-cylinder boxer engine is achieved in that the connecting rod for such an air-cooled two-cylinder boxer engine is configured in that the connecting rod has a different length from the series length. If a revision of the cylinder head is included in the revision of the air-cooled two-cylinder boxer engine, then the embodiment according to the invention can also be applied to two-cylinder boxer engines in which
  • the correspondingly revised cylinder head only has to have an input section known from the standard cylinder heads.
  • the illustrated air-cooled two-cylinder boxer engine has a crankcase (not shown here), a crank mechanism consisting of piston (1), connecting rod (2) and crankshaft (3), a cylinder (4) and a cylinder head (5) which is not completely shown (6) and the outlet channel (7) in the
  • Cylinder head (5) are merely indicated.
  • the inlet valve or the outlet valve are not shown in this view.
  • the piston (1) is at top dead center of the movement of the crank mechanism (1,2,3). It can be seen that the upper edge of the top land (8) of the piston (1) according to the invention from the cylinder (4) by a distance (d), preferably 3 mm, in the
  • the piston head (10) of the piston (1) has in the illustrated manner
  • Input section substantially coincide.
  • the top land (8) of the piston (1) in the illustrated embodiment has a height of (e), preferably 6 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un moteur bicylindre à plat à refroidissement par air, comprenant un carter de vilebrequin, une transmission à manivelle, deux cylindres, deux culasses, un arbre à cames qui se trouve en bas et deux soupapes par cylindre. La culasse possède une portion d'entrée cylindrique adjacente au cylindre. Selon l'invention, un tel moteur bicylindre à plat à refroidissement par air est perfectionné en ce que le bord supérieur du coup de feu du piston fait saillie à l'intérieur de la portion d'entrée de la culasse au point mort haut.
PCT/EP2016/077423 2015-11-19 2016-11-11 Moteur bicylindre à plat à refroidissement par air WO2017084975A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202015106320.2 2015-11-19
DE202015106320.2U DE202015106320U1 (de) 2015-11-19 2015-11-19 Luftgekühlter Zweizylinder-Boxermotor

Publications (1)

Publication Number Publication Date
WO2017084975A1 true WO2017084975A1 (fr) 2017-05-26

Family

ID=54866573

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/077423 WO2017084975A1 (fr) 2015-11-19 2016-11-11 Moteur bicylindre à plat à refroidissement par air

Country Status (2)

Country Link
DE (1) DE202015106320U1 (fr)
WO (1) WO2017084975A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2746669A1 (de) * 1977-10-18 1979-04-19 Benno Prof Dipl Ing Buchelt Vierzylinder-boxermotor
EP0995890A1 (fr) * 1998-10-20 2000-04-26 Wärtsilä NSD Schweiz AG Cylindre pour un moteur à combustion interne
WO2001063112A1 (fr) * 2000-02-24 2001-08-30 Volkswagen Aktiengesellschaft Procede de fabrication de pistons pour moteur alternatif a combustion interne
WO2002099259A1 (fr) * 2001-06-06 2002-12-12 Textron Lycoming Ensemble cylindre ameliore pour un moteur d'aeronef

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2746669A1 (de) * 1977-10-18 1979-04-19 Benno Prof Dipl Ing Buchelt Vierzylinder-boxermotor
EP0995890A1 (fr) * 1998-10-20 2000-04-26 Wärtsilä NSD Schweiz AG Cylindre pour un moteur à combustion interne
WO2001063112A1 (fr) * 2000-02-24 2001-08-30 Volkswagen Aktiengesellschaft Procede de fabrication de pistons pour moteur alternatif a combustion interne
WO2002099259A1 (fr) * 2001-06-06 2002-12-12 Textron Lycoming Ensemble cylindre ameliore pour un moteur d'aeronef

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PAUL RICHARDSON ET AL: "BMW Engine", 31 March 2015 (2015-03-31), XP055354329, Retrieved from the Internet <URL:http://web.archive.org/web/20150331010713/http://www.moorespeed.co.uk/bmw-engine> [retrieved on 20170313] *
RAM SENIOR BHPIAN: "Is it possible to increase the compression ratio?", INTERNET CITATION, 9 May 2006 (2006-05-09), pages 1, XP002664111, Retrieved from the Internet <URL:http://www.team-bhp.com/forum/technical-stuff/9447-possible-increase-compression-ratio.html> [retrieved on 20111122] *

Also Published As

Publication number Publication date
DE202015106320U1 (de) 2015-11-30

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