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).
Continued list of specifications and recommendations for components like pinion springs, armatures, and damper pistons.
| Identifier | ExFiles\Box 64\4\ scan0220 | |
| Date | 16th March 1929 guessed | |
| -2- Contd. (11) Pinion spring of rather high rating, but set up force of initially small value. (12) Armature operated contact made over the last portion of the armature travel of amount between .100 and .200". N.B. This has so far not come out very consistently. As regards instructions for production, the following remarks may be made:- Items (1), (2), (3), (4), (5), (6) and (7) stand as specified. (8) We are recommending for production an armature stroke of .600 (.075 increase) relative to damper piston, giving a total armature travel of .775". (9) For production we are recommending a long & low rate spring (details of which have been exactly specified by us). This will have a rate of 3-1/4 lbs/inch in place of 5 lbs/inch as at present, and should provide an initial set up force of 5.75 lbw. (10) Pinion clearance from wheel in disengaged position we are recommending to be .175", i.e. equal to the damper travel. There have been two reasons for this increased clearance, viz : (a) We have evidence that it reduces the frequency of corner jamming. (b) This amount of clearance is desirable to avoid the possibility of bouncing the armature back, causing a knock or jangle between the teeth. Even with this force this bouncing back occurs when there is no release hole through the piston. clearance. | ||