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).
Oil pressure application methods for piston and crankshaft tests.
| Identifier | Morton\M2.1\ img002 | |
| Date | 27th April 1918 guessed | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -3- E1/G26718 Contd. which the crank is deflected. The oil pressure may be applied either to give the piston test alone, or the piston and crank-shaft test combined, just as is most convenient. The force should be applied by the pattern of small oil pump already described. Two cylinders of the three-cylinder pump may be used for the two high pressures in the cylinders, as Mr. Royce does not think the regular spacing of the impulses would matter, or on the other hand, it is a simple matter to replace the eccentric shaft of the pump with a new shaft having the eccentrics equally spaced for two cylinders, so that the impulses would be even in point of time. You may find it convenient to work the complete piston and crankshaft test together, obtaining the low pressure oil for the underside of the piston by means of an arrangement embodying a pressure reduction valve from the oil supply to the short standard working cylinder, applying torque in the reverse direction. Referring again to the question of getting rid of the air from the working cylinders, which is of the utmost importance, affecting as it does the size of the pump required for the test, we think the oil should be fed in at the bottom of the working cylinders, and the pressure limiting relief valves should be placed on top of the working cylinders. I believe I have now given you the whole of the information available regarding this apparatus, but should any further points occur to me I will write you concerning them. (Contd.) | ||