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    • 22. 发明授权
    • Heat-insulated four-cycle engine with prechamber
    • 具有预制室的隔热四冲程发动机
    • US5025765A
    • 1991-06-25
    • US514842
    • 1990-04-26
    • Hideo Kawamura
    • Hideo Kawamura
    • F02B3/06F02B19/04F02B19/16F02B25/04F02B75/02F02B77/11
    • F02B77/11F02B19/04F02B19/165F02B25/04F02B2075/025F02B2075/027F02B3/06Y02T10/125
    • A heat-insulated four-cycle engine includes a heat-insulated main combustion chamber, a prechamber having an ejection port communicating with the main combustion chamber and associated with an exhaust valve, a projection mounted on the piston head surface of a piston and movable into the ejection port in the vicinity of the top dead center, a recess defined in the piston head surface around the projection, and intake ports defined in the cylindrical wall of a cylinder which defines the main combustion chamber. Combustion gases produced as a result of combustion of fuel in the prechamber are held in the prechamber by the projection in a high-temperature condition for a certain period of time. Thereafter, as the piston is lowered from the top dead center, the combustion gases are discharged from the prechamber into the main combustion chamber, thus lowering the pressure in the prechamber. Therefore, the temperature in the prechamber is lowered, and the amount of NOx, HC, CO, and black smoke which are emitted is also reduced. Since the intake and exhaust ports are isolated from each other, the amount of heat transferred from the exhaust port to the intake port is small. As a result, the temperature of the region around the intake ports is not increased, and the intake efficiency is not lowered. Inasmuch as the engine has an adiabatic expansion stroke between exhaust and intake strokes, the temperature of the wall of the combustion chamber is lowered when the fuel is ignited, resulting in less knocking possibility.