| 摘要 |
The invention relates to an internal combustion engine, comprising a cylinder block (1) with at least one cylinder barrel (2), a cylinder head (12) with at least one inlet channel (11) and exhaust channel (15) with related inlet and exhaust valves (13, 16) to a combustion chamber (14) situated above a piston (3) moveable in the cylinder barrel (2) and a crank case (6) for lubricating oil situated below the piston (3), wherein the piston (3) has at least two peripheral grooves (17, 18) situated at a distance from each other, each having a piston ring and a piston collection chamber (20) contained between the rings. The engine has an expansion chamber (8) commonly connected to each cylinder barrel (2) via an individual evacuation port (9), said port (9) opening out into the respective cylinder barrel (2), the expansion chamber forming a communicating connection between the cylinder barrel (2) and the inlet channel (11) via the evacuation port (9) and an evacuation channel (10), said evacuation channel (10) opening out into at least one inlet channel (11) or inlet manifold. The evacuation port (9) and the piston (3) are so adapted to each other that the piston (3) holds the evacuation port open in order to maintain the connection between the crank case (6) and the inlet channel (11) during the piston's (3) movement from its top dead centre to a position at a predetermined distance from the top dead centre and thereafter breaks the connection of the evacuation port (9) with the crank case (6) during its continued movement down to bottom dead centre, and that the collection chamber (20) is connected to the evacuation port (9) when the piston is near the bottom dead centre.
|
