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).
The design and operation of an automatic lubrication system, comparing impulse coupling and rotary pump mechanisms.
| Identifier | ExFiles\Box 141\2\ scan0182 | |
| Date | 19th April 1939 | |
| -2- (5) Since the unit is comprised of six separate pumps the failure of one pipe line does not render the whole lubrication system inoperative. (6) Being entirely automatic in operation, it will be possible to remove the unit from the dashboard leaving more room for wireless, heaters etc. It is considered desirable to operate the unit from the gearbox since the amount of oil required at the various lubrication points is roughly proportional to road mileage. If the pump is driven from the suspension or clutch over-oiling and mess will result under certain road conditions. When the pump was tested it was found that it did not work satisfactorily at slow speeds, so it is considered advisable to include some form of impulse coupling in the drive. A photograph of a simple form of impulse coupling is attached. It appears that the best point from which to take the drive is the servo shaft, as this is the only shaft rotating slow enough to allow a correct speed for the pump drive when using a single stage reduction with a worm wheel of reasonable proportions in the impulse coupling. An oscillating pump and the necessary driving mechanism has been fitted to I.B.50 and is working satisfactorily after 600 miles. We think that a rotary pump would be more satisfactory for this form of drive because impulse coupling and worm wheel can be mounted direct on the pump shaft and we would like a scheme preparing as soon as possible, on these lines. Rm{William Robotham - Chief Engineer}/HFP. | ||