Two-cycle internal combustion engine

Patent · Tue Mar 22 04:00:00 EST 1988

OSTI ID:5004811

Tanahashi, T; Nakamura, N; Ujihashi, M; Noguchi, H; Ito, T; Baika, T; Hirose, K; Horii, K

A two-cycle internal combustion engine is described comprising: a cylinder head having first and second intake ports for introducing fresh air into a combustion chamber and at least one exhaust port for discharging exhaust gas from the combustion chamber; an air charging means for supplying compressed fresh air to the intake ports; first and second intake valves and at least one exhaust valve for opening and closing the first and second intake ports and the exhaust port, respectively; and a valve operating means operated in response to a crank angle. The engine further comprises: an inlet air control valve for substantially closing the second intake port during an idling or light load running condition of the engine; the valve operating means including a means for opening the exhaust valve earlier than the second intake valve and opening the first intake valve later than the second intake valve, while a speed of the downward movement of the piston is relatively high, so that a part of exhaust gas in the exhaust port flows back to the combustion chamber; and, means for forming an exhaust gas swirl rotating around a cylinder axis of the combustion chamber when the exhaust gas flows from the exhaust port back to the combustion chamber.

• Assignee: Toyota Jidosha Kabushiki Kaisha
• Patent Number(s): US 4732116
• OSTI ID: 5004811
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AIR FLOW
COMBUSTION CHAMBERS
CONTROL EQUIPMENT
CYLINDERS
DUCTS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
FLUIDS
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OPERATION
VALVES
VORTEX FLOW
WASTES