| 摘要 |
A two-stroke engine includes at least one cylinder, a piston reciprocable within the cylinder and a cylinder head which contains at least one exhaust port and at least two inlet ports which are controlled by respective poppet valves. The cylinder defines a combustion chamber of pent-roof form with which the inlet and exhaust ports communicate. The inlet ports are of directed type whereby, in use, the flow of air through them is generally away from the exhaust valve(s) and thus flows down the wall of the cylinder adjacent the inlet port. The axes of the inlet ducts converge in the direction of flow through them and the axis of each inlet defines angle of at least 20 DEG with that of the other inlet duct when viewed in the direction of the cylinder axis.
|
