초록 ▼

Disclosed are several embodiments of a turbo-charged two cycle internal combustion engines utilized in combination with an outboard motor are disclosed. In each embodiment, the exhaust system for the engine includes devices for insuring that sufficient backpressure is exerted at the exhaust port of

Disclosed are several embodiments of a turbo-charged two cycle internal combustion engines utilized in combination with an outboard motor are disclosed. In each embodiment, the exhaust system for the engine includes devices for insuring that sufficient backpressure is exerted at the exhaust port of one cylinder during the overlap period when its scavenge passages and exhaust ports are both open so as to preclude the discharge of fresh fuel/air mixture to the atmosphere without adversely affecting the turbo-charger performance. In some embodiments of the invention, a valve arrangement is controlled for controlling the proportion of the exhaust gases that flow across the turbo-charger so that at some running conditions, the turbo-charger receives all of the exhaust gases. In all embodiments, an expansion chamber device is incorporated in the drive shaft housing of the outboard motor and in some embodiments, the turbo-charger turbine inlet receives its gases from this expansion chamber.

대표청구항 ▼

A turbo-charger arrangement for an internal combustion engine having an exhaust chamber for receiving exhaust gases from a plurality of exhaust ports of respective engine chambers, an outlet from said exhaust chamber, an exhaust pipe having an inlet end communicating with said exhaust chamber outlet

A turbo-charger arrangement for an internal combustion engine having an exhaust chamber for receiving exhaust gases from a plurality of exhaust ports of respective engine chambers, an outlet from said exhaust chamber, an exhaust pipe having an inlet end communicating with said exhaust chamber outlet and an outlet end, a turbo-charger having a turbine stage inlet communicating directly with said exhaust chamber and a turbine outlet, valve means for closing said outlet for directing substantially all of the flow of exhaust gases from said exhaust chamber to said turbo-charger turbine stage inlet without flowing through said exhaust pipe, and an expansion chamber, said exhaust pipe extending into said expansion chamber with its outlet end opening directly into said expansion chamber.