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).
Parsons Marine Reverse Gears, including lubrication systems, gear sizes, and blueprints for B.60 and B.80 engines.
| Identifier | ExFiles\Box 133\3\ scan0132 | |
| Date | 16th February 1940 | |
| 1128 To Rm.{William Robotham - Chief Engineer} ~~c.c to Jnr.{Charles L. Jenner}~~ Rm{William Robotham - Chief Engineer}/AA.{D. Abbot-Anderson}2/B.16.2.40. PARSONS MARINE REVERSE GEARS. I have to-day received a number of blue prints from Parsons Engineering Co., Ltd., and am discussing them with Jnr.{Charles L. Jenner} this afternoon. The Parsons people suggest the F.A. Size gear for the B.60 engine and H.size gear for the B.80 engine. The following is an extract from the letter I have received from Parsons, explaining the lubrication system - "The basis of the lubrication system on which we have worked in both cases is the oil under pressure from your engine passing through the drilled crankshaft and rev-rse gear shaft into the reverse gear working parts, then falling into the sump which is in one with your engine sump. In this connection it would be as well to make sure that this plan is suitable when an engine is placed at a considerable angle perhaps up to 12 degrees or even more. If it is not so, then we shall have to re-arrange the lubrication system as in other cases by providing a trough in the reverse gear with a return pipe to the engine sump, the oil being collected and thrown into the trough in any manner usual with us." They are assuming that we will design a new crankcase for the engine, part of which will form the bottom half of the gear box but it is quite obvious that it is unnecessary for us to take this step. The following is a schedule of blue prints from Parsons:- "FA SIZE GEAR. Sheet No. 2467, is an external view of the internal working portions showing the direct drive and also the facing for the reducing gear if fitted. Sheet No. 2468, shows a typical bottom half casing of the reverse gear giving you the information for designing your extension. Sheet No. 2469, gives you similarly a typical top half to reverse gear with the necessary openings so that you can use the information in your design. (Ctd:- | ||