(19)
(11) EP 0 474 217 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.11.1992 Bulletin 1992/48

(43) Date of publication A2:
11.03.1992 Bulletin 1992/11

(21) Application number: 91114944.1

(22) Date of filing: 04.09.1991
(51) International Patent Classification (IPC)5: F01L 1/26, F01L 3/10, F01L 1/14
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 04.09.1990 JP 235268/90

(60) Divisional application:
95114828.7 / 0691457

(71) Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
Iwata-shi Shizuoka-ken, 438 (JP)

(72) Inventors:
  • Oyaizu, Takaeshi
    Kakegawa-shi, Sizuoka-ken (JP)
  • Iikura, Masahiko
    Iwata-shi, Shizuoka-ke (JP)

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


(56) References cited: : 
   
       


    (54) A valve operating mechanism for an internal combustion engine


    (57) The present invention relates to a self-operating mechanism for a 4-cycle internal combustion engine comprising more than two intake valves (14) and a plurality of exhaust valves (15), specifically to a 5-valve engine. In order to provide sufficient space for the cooling jacket (31) on the exhaust side of the cylinder head and/or increasing the valve lift of the exhaust valves without increasing the total height of the engine, the valve spring retainers (21) of the exhaust valves (15) together with the upper ends of the associated exhaust valve springs (23) are accomodated inside the exhaust valve lifters (19), respectively, while the valve spring retainers (20) of the intake valves (14) are disposed adjacent to a lower end of the associated intake valve lifters (18).






    Search report