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).
Issues with the Phantom III water pump coupling, detailing problems caused by insufficient flexibility and suggesting a design review.
| Identifier | ExFiles\Box 149a\1\ scan0130 | |
| Date | 31th May 1937 | |
| COPY. E.{Mr Elliott - Chief Engineer} from RHC{R. H. Coverley - Production Engineer}/Cy. c. to Da.{Bernard Day - Chassis Design} c. to RHC.{R. H. Coverley - Production Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} 1269. RHC{R. H. Coverley - Production Engineer}/Cy.1/LS.31.5.37. PHANTOM III. WATER PUMP COUPLING. As mentioned to Da.{Bernard Day - Chassis Design} we have complaints from the Test department in connection with the above couplings on account of insufficient flexibility. This causes the bushes to wear out in the course of testing and puts so much end thrust on the spindle as to wear down the end location and cause rubbing of the rotor on the case. The accumulation of limits allows the pump to be mal-aligned with the dynamo, in addition to the various necessary eccentricity limits. While no provision is made for this slight parallel lateral mal-alignment such as that permitted by the old 4-prong arrangement, and fibre disc with 4 slots in its periphery, on 'Silver Ghost', it is not that we ask for reversion to this type. Another undesirable feature is that the splining is carried into that part of the shaft which fits the white-metalled bearing. The parts are as accurately produced as can be expected and are within reasonable manufacturing limits. If these conditions then fail to give the required results, we suggest that the design should receive attention. We suggest that the 'Simms' coupling would be a suitable drive, or perhaps you may have other views. RHC{R. H. Coverley - Production Engineer}/Cy. | ||