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).
Technical memorandum on reverse gear modifications and servo drive lubrication.
| Identifier | ExFiles\Box 179b\2\ img200 | |
| Date | 12th December 1932 | |
| Hdy.{William Hardy} From Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} C. to By.{R.W. Bailey - Chief Engineer} C. to E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}2/MA.12.12.32. P.II SYLINGH. Hdy.{William Hardy}S/M/34.30.11.32. K4558 X7310 Reverse Gear. The new reverse gear of the long pattern works further into mesh under load, pushing the gear lever against the gear gate. We propose inserting a bronze ring in the rear bearing house so that the gear can thrust against it, providing of course grooves in the ring for lubrication. It will be remembered that we had to arrange that the 1st. gear should thrust against the roller race to guard against distortion of the selector mechanism. Lubrication of Servo Drive. The early synchromesh boxes provide lubrication to the rear of the gearbox when descending a steep hill by oil which is thrown up by both sets of continuous gears running along a trough on the rear side of the box. The oil returning to the middle compartment by a hole of about 1" dia. at the bottom of the box between the 2nd. motion and reverse shafts. The oil from the trough pours onto the reverse shaft. Tests showed that at down hill gradients of less than 1 in 4 oil was thrown onto the servo by the 2nd. speed pinion. At steeper gradients the servo was only directly lubricated if the reverse shafts were turning but however receives some lubrication from oil that drips from the lid.{A. J. Lidsey} On the long pattern reverse there is no oil trough the oil in the rear compartment being maintained up to the level of the hole through which passes the reverse shaft, the return oil hole also having been deleted. | ||