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).
Modifications to a motor arrangement to address gear noise and pinion engagement.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan163 | |
| Date | 22th February 1929 guessed | |
| contd :- -3- We have found a clearance equal to the damper travel viz: .175" to be suitable which leaves a travel of the armature relative to the damper of .525" in the present motor. The pinion width is .600", so that an increase of relative armature travel of .050" or .075" to .650" or .675" is indicated, otherwise the pinion is never fully in mesh. This, in its turn might call for a return to 17 S.W.G. owing to longer range of action causing larger air gap. (4) Gear noise in gear is not as good as we imagine possible. So far as we can see the arrangement we have at present should function satisfactorily on a car and actually be better with an engine throw out than on our rig. We are instructing our present rig arrangement but with 18 S.W.G. teazer in place of 17 S.W.G. for the 10,000 miles car. The arrangement incorporates the following items : 1. Wheel with sharp engaging tooth corners and rounded disengaging corners. 2. Pinion with sharp engaging tooth corners, rounded disengaging corners and backed off teeth as instructed recently by BY/RDS/ML.2129. 3. Motor with 3.100/3.000 taper armature with .012 final air gap and .175 distance short of full armature pole piece register when in fully engaged position. 4. 18 S.W.G. teazer winding of 36 turns. 5. Damper to Lec. design allowing .175" travel, the damper piston to function as the armature stop both ways. 6. Damper piston springs of rating as original design but .175" greater free length to give greater force at every distance. 7. Armature travel relative to piston of .525" or total of .700". contd :- | ||