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).
Causes and solutions for brake wear, squeaking, and compensating shaft flexibility issues.
| Identifier | ExFiles\Box 5\3\ 03-page049 | |
| Date | 1st January 1922 | |
| X4257 To Hs{Lord Ernest Hives - Chair} } from R.{Sir Henry Royce} To Da.{Bernard Day - Chassis Design} } c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to FN. c. to KP. c. to HY.{Tom Haldenby - Plant Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Hy.{Tom Haldenby - Plant Engineer} R2/109/1.22. BRAKES (GOSHAWK) AND GENERAL X.4257. X.4259 Wear of the brake drums may be due to rivets in the Ferodo lining; possibly copper or aluminium ones would be safest, not steel or brass. Also materials may be unsuitable steel, too soft, or Ferodo containing metal or grit. Squeak may be due to resinous substance in lining or want of rigidity of brake drums, or fixing of anchorage. Our strap anchor should be good; we avoid overhanging pins. A pair of more rigid drums with ribs might be tried, or possibly an aluminium drum with tyre steel liner. This may have some terrible fault but probably would not squeak, and might be light: try Raybestos linings. Also squeaking may be due to rivets or metal becoming imbedded in ferodo. Flexibility of compensating shafts have become rather more than desirable because the shafts have too long levers and are not used through a sufficiently big angle for the operation. This is a fault which has come into the designs before this time, owing to limitations. Had I known this I should have found a way out. At present the best way is to shorten the driven lever upon the differential by about 20% (3" less 20% . 2.4), and increase the dia. of the shafts from ¾" to 1", keeping the thickness ¼". The value of this small alteration reduces the torsional deflection to 54% of its present value; (my original levers for these shafts were 2", and the shaft would contd:- | ||