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).
Page from a patent document detailing claims for a rotary valve system in an internal combustion engine.
| Identifier | ExFiles\Box 147\4\ scan0178 | |
| Date | 18th July 1941 guessed | |
| timing shown in Figure 3, but this is not essential since a benefit is obtained whenever the valve is moving at a speed higher than its mean rate, and it may be desirable, in some instances, to effect a compromise, 5 as frequently happens in the design of an engine. HAVING NOW particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:- 10 1. The combination 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 cyclically-varying velocity-ratio and arranged and timed to drive the valve with a 15 varying velocity which is greater than the mean velocity during the periods in which the valves are in register, whereby the circumferential lengths of the ports are greater, with the same timing of the opening and closing of the fixed port, than if the valve is rotated uniformly 20 at its mean velocity. 2. The combination according to claim 1, in which the velocity-ratio afforded by the driving gear varies between the limits 0.8 and 1.2. 3. The combination with a cylinder of a 25 four-stroke internal-combustion engine having an inlet-port, and an exhaust-port of which the circumferential length is less than that of the inlet port, of a rotary 7. | ||