초록 ▼

An improved two stroke, multiple cylinder engine having combustion chambers and a single exhaust conduit for discharging exhaust gasses from the combustion chambers. In accordance with one feature of the invention, the combustion chambers are unified to two groups and respective combustion chambers

An improved two stroke, multiple cylinder engine having combustion chambers and a single exhaust conduit for discharging exhaust gasses from the combustion chambers. In accordance with one feature of the invention, the combustion chambers are unified to two groups and respective combustion chambers belonging to the same group are generally simultaneously fired by a firing system. Otherwise, the entire combustion chambers are generally simultaneously fired. In accordance with another feature, the exhaust conduit has an attenuation mechanism for positive pressure reflection waves generated in the exhaust conduit. In a preferred embodiment, the attenuation mechanism comprises an inner pipe tapered downstream and having a plurality of apertures.

대표청구항 ▼

1. A two stroke crankcase compression internal combustion engine for a snowmobile comprising three combustion chambers for burning air fuel mixtures therein, the three combustion chambers having generally the same size, a firing system for firing the respective air fuel mixtures in said three combus

1. A two stroke crankcase compression internal combustion engine for a snowmobile comprising three combustion chambers for burning air fuel mixtures therein, the three combustion chambers having generally the same size, a firing system for firing the respective air fuel mixtures in said three combustion chambers, and an exhaust system for discharging exhaust gasses from said three combustion chambers, said exhaust system having a single exhaust conduit collecting the exhaust gasses, and two of said three combustion chambers being fired generally simultaneously by said firing system.