(19)
(11) EP 1 022 448 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.07.2001 Bulletin 2001/27

(43) Date of publication A2:
26.07.2000 Bulletin 2000/30

(21) Application number: 00101454.7

(22) Date of filing: 25.01.2000
(51) International Patent Classification (IPC)7: F02B 75/02, F02F 1/24, F02B 33/20, F02B 25/04
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 25.01.1999 JP 1569399

(71) Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
Minato-ku Tokyo (JP)

(72) Inventors:
  • Ueda, Minoru, c/o K.K. Honda Gijutsu Kenkyusho
    Wako-shi, Saitama (JP)
  • Ooki, Kenji, c/o K.K. Honda Gijutsu Kenkyusho
    Wako-shi, Saitama (JP)
  • Tsushima, Yuji, c/o K.K. Honda Gijutsu Kenkyusho
    Wako-shi, Saitama (JP)
  • Yagasaki, Akio, c/o K.K. Honda Gijutsu Kenkyusho
    Wako-shi, Saitama (JP)

(74) Representative: Liska, Horst, Dr. et al
Weickmann & Weickmann Patentanwälte Postfach 860 820
81635 München
81635 München (DE)

   


(54) Two-cycle internal combustion engine


(57) The invention provides a two-cycle internal combustion engine which can realize scavenging by air, prevent blow-by of a fuel mixture in a scavenging stroke, and prevent combustion of a lubricating oil in a combustion chamber to thereby purify an exhaust gas.
To achieve this, a two-cycle internal combustion engine 1 includes a compressor section (20) for performing a compression stroke in concert with a scavenging stroke by a piston (7) reciprocating in a cylinder (8). A fuel mixture from a carburetor (17) is pressurized to be supplied to a combustion chamber (12) by the compressor section (20). On the other hand, a scavenging air is also pressurized to be supplied to the cylinder (8) from its side wall by the compressor section (20). An oil pump (60) driven by a crankshaft (3) is provided to pump up a lubricating oil stored in a bottom portion of a crankcase, thereby lubricating the crankshaft with the lubricating oil supplied from the oil pump.






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