(19)
(11) EP 2 148 058 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.03.2013 Bulletin 2013/11

(43) Date of publication A2:
27.01.2010 Bulletin 2010/04

(21) Application number: 09009562.1

(22) Date of filing: 23.07.2009
(51) International Patent Classification (IPC): 
F01P 1/08(2006.01)
F02D 9/10(2006.01)
F02M 35/10(2006.01)
 F01P 1/10(2006.01)
F02F 1/28(2006.01)
F01P 1/06(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
AL BA RS

(30) Priority: 24.07.2008 JP 2008190450
25.02.2009 JP 2009042922
25.02.2009 JP 2009042957
08.05.2009 JP 2009114018

(71) Applicant: Yamaha Hatsudoki Kabushiki Kaisha
Shizuoka-ken Shizuoka 438-8501 (JP)

(72) Inventors:
  • Matsubara, Toshio
    Iwata-shi Shizuoka-ken 438-8501 (JP)
  • Ishizuka, Yasushi
    Iwata-shi Shizuoka-ken 438-8501 (JP)
  • Morita, Kyouji
    Iwata-shi Shizuoka-ken 438-8501 (JP)
  • Nagai, Yoshitaka
    Iwata-shi Shizuoka-ken 438-8501 (JP)
  • Ishi, Wataru
    Iwata-shi Shizuoka-ken 438-8501 (JP)
  • Tsuzuku, Hiroyuki
    Iwata-shi Shizuoka-ken 438-8501 (JP)
  • Gouke, Takayuki
    Iwata-shi Shizuoka-ken 438-8501 (JP)

(74) Representative: Zimmermann, Tankred Klaus et al
Schoppe, Zimmermann, Stöckeler & Zinkler Patentanwälte Postfach 246
82043 Pullach bei München
82043 Pullach bei München (DE)

   


(54) Forced air-cooled vehicle engine unit, and motorcycle


(57) An auxiliary air intake passage defining member 41 is connected to an air intake pipe 36 connected to a cylinder head 23. The auxiliary air intake passage defining member 41 defines an auxiliary air intake passage K1. The auxiliary air intake passage K1 is branched from a main air intake passage P1 in the air intake pipe 36 to guide intake air into a space defined adjacent to an injection nozzle of an injector at least during idling. At least a part of the auxiliary air intake passage defining member 41 is located outside a shroud 50. A portion around the injection nozzle is cooled by assist air from the auxiliary air intake passage K1 during idling. A portion around the injection nozzle is cooled by cooling wind generated by a fan 56 during the movement of a vehicle.







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