From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Description of an improved rotary valve and driving gear for an internal-combustion engine.
| Identifier | ExFiles\Box 147\4\ scan0173 | |
| Date | 13th August 1940 guessed | |
| This invention concerns an improved rotary valve and driving gear therefor which is suitable for use in an internal-combustion engine, or a pump and like machines in which the inlet and exhaust of fluid to and 5 from a working cylinder have to be controlled. The invention is of special advantage when used as a valve for an internal-combustion engine, of the type in which the interior of the hollow valve constitutes the combustion chamber or a part thereof, and the valve is provided 10 with a port which, by rotation of the valve, is brought into register with an inlet port and an exhaust port as required by the working cycle of the engine. It is desirable, particularly in the case of the inlet-port, to obtain the largest port area that is 15 possible, and other things being equal, this is obtained by increasing the length of the valve-port and the port with which it registers, circumferentially in the direc- tion of motion of the valve. But the times of opening and closing the communication (i.e. the timing of the valve) 20 are determined by other factors, principally by the position of the working piston in the cylinder, so that the circumferential length of the ports has hitherto been considered to be incapable of variation. This arose from the fact that the valve was driven from the crankshaft 25 of the engine and the relative timing was fixed. The present invention provides the combina- tion with a cylinder having a fixed port, of a rotary valve having a port to register with the fixed port during rotation of the valve, and a driving gear affording a 30 cyclically-varying velocity-ratio and arranged and timed 2. | ||