(19)
(11) EP 0 400 338 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.03.1991 Bulletin 1991/13

(43) Date of publication A2:
05.12.1990 Bulletin 1990/49

(21) Application number: 90108198.4

(22) Date of filing: 29.04.1990
(51) International Patent Classification (IPC)5: F02F 1/22, F02B 75/02
(84) Designated Contracting States:
DE ES FR GB

(30) Priority: 30.05.1989 IT 2068689

(71) Applicant: CAGIVA MOTOR ITALIA S.P.A.
I-21100 Varese (IT)

(72) Inventor:
  • Goggi, Andrea
    I-21026 Gavirate Varese (IT)

(74) Representative: Luksch, Giorgio, Dr.-Ing. et al
Ing. A. Giambrocono & C. S.r.l. Via Rosolino Pilo, 19/b
20129 Milano
20129 Milano (IT)


(56) References cited: : 
   
       


    (54) Device for varying the direction in which fuel flows into an engine cylinder, in particular of a two-stroke motorcycle engine


    (57) An engine, in particular a two-stroke motorcycle engine, comprises a cylinder (1) containing a chamber (3) in which a piston (4) moves; a fuel composed of air and the usual oil-gasoline mixture reaches said chamber (3) via feed passages (7). Movable deflector means (8) are arranged in at least one of said passages (7) in proximity to its entry (14) into the chamber (3) to orientate the fuel jet in such a manner as to result in improved scavenging of the chamber (3) during the appropriate phase of the engine cycle, said deflector means (8) varying the geometry of the passage (7) in which they are located as a function of the engine rotational speed and/or the position of the piston (4) within the cylinder chamber (3) or the engine cycle and/or the degree of opening of the accelerator.
    The movement of said deflector means (8) occurs by the effect of the pressure in the cylinder chamber (3) and in the feed passage (7), and the fuel throughput through said passage (7) or rather the thrust gene­rated by it on said deflector means (8).







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