2-cycle engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorMasanori Takahashi
Life of this patent
Estimating the term…
Abstract
A number of embodiments of outboard motors embodying pressure scavenged 2-cycle internal combustion engines. In each embodiment, a plenum chamber serves the scavenge passages of the engine and the pressure relief for a scavenge pump is provided by a pressure relief valve in the plenum chamber so as to reduce the opening and closing of the pressure relief valve due to pulsations caused by the engine operation. In one embodiment, the pressure is relieved by discharging the air to the exhaust system for silencing and also for cooling the exhaust gases. In other embodiments, the air for pressure relief is discharged to the atmosphere.
Claims30
An internal combustion engine comprising a combustion chamber defined by at least a pair of relatively moveable components, a scavenging port communicating with said combustion chamber and opened and closed by the relative movement of said components, a plenum chamber communicating with said scavenge port, an air compressor for receiving atmospheric air and delivering a compressed charge to said plenum chamber for admission to said combustion chamber upon opening and closing of said scavenge port, and a pressure relief valve in said plenum chamber for limiting the maximum pressure in said plenum chamber.
An internal combustion engine comprising a combustion chamber defined by at least a pair of relatively moveable components, and intake port communicating with said combustion chamber, an air compressor for delivering a compressed air charge to said intake port, an exhaust port for discharging exhaust gases from said combustion chamber, an exhaust system for receiving exhaust gases from said exhaust port and discharging them to the atmosphere, a pressure relief valve for relieving the pressure in said intake port, and means for communicating the air relieved from said intake port by said pressure relief valve to said exhaust system.
Dependencies are inferred from the claim text.