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 performance and modifications of a clutch, synchro-mesh gearbox, and servo motor mechanism.
| Identifier | ExFiles\Box 5a\3\ 03-page174 | |
| Date | 14th December 1931 guessed | |
| -8- prevented it. We believe that there is still a certain amount feeding from that source. It will be proved when the clutch is again dismantled. With regard to the thin web flywheel we have not had, or noticed, any disadvantages. The clutch has, on one or two occasions, been very sluggish in stopping. The clutch fabrics when examined were in a good condition and showed no traces of spreading or fraying. It was noted and reported at the time of dismantling the clutch that a certain amount of chatter had taken place on the clutch shaft at the gearbox end and the ball race end. SYNCHRO-MESH GEARBOX to LOP.G.54794 H.S.3814. G.J.498-519. (1) G.54747 Operating Stirrup 3rd. & 4th. Speeds produced in BS{A J. Barnes - Assistant Manager}/2G - replacing D/W. (a) Reverse Shaft Bushes (Whitemetal) .0035 clearance and spiral grooves added as shown on Ex.6959/60 b The forward Reverse Shaft Bush Ex.6960 additional oil hole added to increase splash lubrication. (3) Oil Passage for Clutch Spigot lubrication restricted by drilling .093 dia. hol - in place of .201 dia. (4) Oil Baffle Ex.7122 fitted between Cover and Ball Bearing on 1st Motion Shaft to cure Oil Pumping into the Clutch Spigot Casing etc. The easy changing of 3rd. and direct gears has remained consistently good and there has not been the slightest trouble throughout the mileage. We have, however, had a considerable amount of backlash in the gears. It is the same with the 1st. and 2nd. gears, therefore, it is not peculiar to the synchro mesh only and must be the general loose fitting of the gears on the splines. An examination of the gearbox will have to be made to get at the actual trouble. We have had no trouble with the anchorage of the gearbox. A fair amount of oil has escaped from the servo drive shaft bearing. The remaining part of the box was free from oil leaks. The anchorage of the pedal shaft on the gearbox as at present does not allow free movement of the diamond mounting of the engine and causes wear to take place in the boss on the gearbox. The box has been replenished with one pint of oil during the mileage. SERVO MOTOR MECHM. to LOP.G.54308 H.S.3815 G.J.518-501. 35° Ball Bearing type Servo Cam Levers. - Ex.6310 Sleeve. Ex.6311 Ring. G.32134 Sleeve. The servo has given no trouble with regard to sticking. Its efficiency gradually decreased and when dismantled the fabrics were found to be soaked with oil, also spread binding on the brake drum. The oil had apparently got through the drain holes on the brake drum flange. The back of the servo was covered with oil which had escaped from the servo drive in the | ||