Two-stroke internal combustion engine

Details Two-stroke internal combustion engine Two-stroke internal combustion engine

F - Mech Eng,Light,Heat,Weapons

02

B

F02B 25/22 (2006.01) F02B 25/14 (2006.01) F02B 63/02 (2006.01) F02B 75/02 (2006.01)

Patent

CA 2397331

The invention relates to a crankcase scavenged internal combustion engine (1) of two-stroke type, comprising a cylinder (2) with an inlet tube (10) for air/fuel mixture and a number of transfer ducts (20), a carburettor (12) connected to the inlet tube (10), and an air inlet (24) provided with a restriction valve (25) whereby a piston ported air passage (23, 22, 26, 21) is arranged between the air inlet (24) and the upper part of the transfer ducts (20). The engine's air inlet (24) extends at least partly below and outside the carburettor (12), resulting in a more compact engine design and improved use of the space around the cylinder. Moreover, the cooling air gets better access to the cylinder.

La présente invention concerne un moteur à combustion interne à deux temps (1) à carter balayé, comportant un cylindre (2) présentant un tube d'admission (10) de mélange air/combustible et plusieurs conduits de transfert (20), un carburateur (12) relié au tube d'admission (10), et un orifice d'admission d'air (24) muni d'un clapet de dépression (25) dans lequel un passage d'admission d'air à pistons (23, 22, 26 21) est disposé entre l'orifice d'admission d'air (24) et la partie supérieure des conduits de transfert (20). L'orifice d'admission d'air (24) du moteur s'étend au moins en partie en dessous et hors du carburateur (12), permettant ainsi un dimensionnement de moteur plus compact et une meilleure utilisation de l'espace autour du cylindre. Par ailleurs, l'air de refroidissement accède plus facilement au cylindre.

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