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).
Recommendations for the 'S.S.' motor with damper, including adjustments to armature travel and gear specifications.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan174 | |
| Date | 9th March 1929 | |
| To BY.{R.W. Bailey - Chief Engineer} from EFC. c. to BY/RD. c. to RHC.{R. H. Coverley - Production Engineer} ORIGINAL EFC1/LG9.3.29. 'S.S.' MOTOR WITH DAMPER. X7625 Further to our EFC3/LG6.3.29., for further motors we recommend the total armature travel be increased by .075 to .775. Since the pinion width is .600, this means an out of gear clearance of .175, which will virtually be greater owing to the backing off of the teeth. It will be the case that when the armature is pushed .175 towards in-gear position by pushing at the damper, the pinion and wheel teeth will be just not graze when the wheel is turned. The damper stroke is .175. We recommend that the switch contacts make at .200 before the end of the full armature stroke. Then if the damper piston sticks in its out of gear position as a result of cold oil, the system will still function. The combination of items recommended for further motors becomes :- (1) Wheel with sharp engaging tooth corners, rounded disengaging tooth corners and backed off teeth as recently applied to pinion only. (2) Pinion with sharp engaging tooth corners, rounded disengaging tooth corners and teeth not backed off in the first instance. (3) Motor with 3.100/3.000 damper armature contd :- | ||