| 摘要 |
A rotary valve i.c. engine has a piston connected to a crankshaft and reciprocable in a cylinder 2, and a rotary valve 5 rotatable, eg about the cylinder axis, in a valve housing 8 fixed relative to the cylinder 2. The rotary valve 5 has a volume 9 defining, in part, the combustion chamber 4 and a port 12 communicating successively, during rotation of the valve 5, with inlet and exhaust ports 13, 14. The valve 5 may have a cylindrical part 6 mounted on a ball bearing 7. Alternatively, the valve member may be conical. The interior volume 9 of the valve may have a hemispherical upper end 10 and a wall 11 with the port 12 which may be a bore or hole (fig.4a) or a recess in the lower edge of the cylindrical wall 11 (fig.4b). A spark plug 15 and glow plug 16 may be provided. The rotary valve 5 may be belt driven via a pulley 17 and may have cooling fins 28. A horizontally opposed twin cylinder flat engine may have rotary valves mounted with their axes on the cylinder axes (fig.5) or at right angles thereto (fig.6). The engine may have spark or compression ignition with a carburettor of fuel injection. |
