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).
Ball bearing clearance in dynamos to reduce noise and humming effects on a trial car.
| Identifier | ExFiles\Box 53\4\ Scan074 | |
| Date | 1st January 1924 | |
| 'F' COPY. BY7-P8.1.24. DYNAMO. 10,000 MILES TRIAL CAR 12-EM. __________________________ With reference to the question of the ball bearings in the Dynamo, I am certainly of the opinion that tight ball bearings, that is, ball bearings which are fitted up with a slight definite clearance between the balls and the races, are liable to increase noise effects. I have actually instructed that we shall ask for a special assembly of the ball bearings for Dynamo use which will assure us of a positive clearance being arranged in each case. I am inclined to think the reason why the bearing is sensitive is that a tighter fitting bearing will transmit the vibrations more readily from the armature of the case than a slacker one, and therefore induce humming effects. BY.{R.W. Bailey - Chief Engineer} | ||