(19)
(11) EP 1 065 356 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.03.2001 Bulletin 2001/13

(43) Date of publication A2:
03.01.2001 Bulletin 2001/01

(21) Application number: 00111188.9

(22) Date of filing: 24.05.2000
(51) International Patent Classification (IPC)7: F01M 13/02, F02M 25/06, F02B 39/00
(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: 24.05.1999 JP 14267499

(71) Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
Iwata-shi Shizuoka-ken (JP)

(72) Inventors:
  • Yoshikatsu, Iida
    Iwata-Shi, Shizuoka-ken (JP)
  • Yasunobu, Fujiwara
    Iwata-Shi, Shizuoka-ken (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Four-stroke cycle engine


(57) A four-stroke cycle engine (1) having an intake passage (14) and an exhaust passage (30) both opening to a combustion chamber (15), and having an intake valve (17) for opening and closing the intake passage (14) and an exhaust valve (16) for opening and closing the exhaust passage (30), with blowby leaking from the combustion chamber (15) into a crank chamber (8) returned to the intake passage (14) through a circulation passage (60) and with the circulation passage (60).
A fresh air intake passage (71) is provided to make fluid communication between part of the intake passage (14) on the upstream side of a throttle valve (37) and the crank chamber (8), with the fresh air intake passage (71) provided with a fresh air inflow valve (72).






Search report